CN101241220A - Lens driving apparatus, imaging apparatus, and lens barrel and camera main body used for the imaging apparatus - Google Patents

Abstract

Provided is a camera device, in which a lens barrel and a camera main body can be separated from each other. The camera device is provided with a camera lens group including a focalizing lens for imaging the object to be imaged; a motor drive mechanism including a motor for moving the focalizing lens in an optical axis direction; a storage mechanism which stores an information table containing the control information of the focalizing lens; and a first data receiving-transmitting mechanism which transmits the information outputted from the storage mechanism to the camera main body. The camera main body comprises: a camera device imaging the light of the object to be imaged, which is generated by the camera lens group; a second data receiving-transmitting mechanism which receives the information transmitted by the first data receiving-transmitting mechanism; and a motor control mechanism which controls the motor according to the received information outputted from the second data receiving-transmitting mechanism. The focalizing lens is controlled by the motor control mechanism and based on the information transmitted from the second data receiving-transmitting mechanism to the first data receiving-transmitting mechanism. Origin detection and high precision position control can be successfully performed.

Description

Lens driver, camera head and be used for the lens barrel and the camera body of this camera head

The name that the present invention is based on Dec 9th, 2004 application is called " lens driver, camera head and be used for the lens barrel and the camera body of this camera head " and domestic applications number dividing an application for the PCT application for a patent for invention of 200480036780.X.

Technical field

The present invention relates to camera heads such as still image camera and video camera, the lens that reach them carry out the lens driver of position control, the lens barrel that is used for camera head and camera body.

Background technology

In the past, proposition has following method, promptly, use is installed in shading member and the photoelectric sensor on the lens unit, use the motor driven lens unit, in the output level of the photoelectric sensor when monitoring that shading member sweeps away photoelectric sensor, detect the origin position (for example with reference to patent documentation 1) of lens unit.

With Figure 58 existing lens driver is described.Figure 58 is the skeleton diagram and the block diagram of an example of existing lens driver.Transmission is fixed on the image of the subject that is taken behind fixed lens 72, zoom lens 73 and the condenser lens 74 on the lens barrel 71, is transformed to electric signal by imaging apparatus 75.Signal processing part 82 generates view data and the contrast information that is used to focus on adjustment according to the electric signal from imaging apparatus 74 outputs.

When connecting the power supply of main body, export the instruction of condenser lens 74 to focus motor control part 80 to imaging apparatus 75 side drives from systems control division 81.At focus motor drive division 83, according to moving direction and mobile step information, to motor 79 output drive signals, to reach desirable sense of rotation and rotation amount of movement from focus motor control part 80.Also import the position of rotation of the zoom ring 76 that detects by zoom ring position test section 84 to focus motor control part 80.

When condenser lens 74 arrived the position of representing with the dotted line of Figure 58, photoelectric sensor 78 crested members 77 covered, and the output signal level of photoelectric sensor 78 changes.(perhaps according to the structure of circuit, when not reaching threshold value) with the counter reset that focus motor control part 80 has in advance, detects the absolute position of condenser lens 74 when this output signal level surpasses certain threshold value.Meanwhile, the positional information that will be used to focus on the condenser lens 74 of adjustment outputs to systems control division 81.

Concerning by the absolute position of the detected like this condenser lens 74 of control and the position of zoom lens 73, carry out under the situation of zoom action, also consider following purposes: when keeping focusing state, carry out the position control of condenser lens 74, perhaps make the speed of the drawing in high speed of automatic focusing function, or predict distance with subject according to the absolute location information of condenser lens 74.

In addition, following example is disclosed in the prior art, that is, and in changing the lens type camera head, utilize under the situation of motor driven condenser lens, on lens barrel, be equipped with the motor that condenser lens is moved, the driving circuit of CD-ROM drive motor and the microcomputer of control motor position.

Existing camera head about such describes with reference to Figure 59.Figure 59 is the skeleton diagram and the block diagram of an example of existing camera head.The example of Figure 59 is lens barrel 88 and camera body 89 separable replacing lens type camera heads, is the example that can separate from the signal wire junction surface (not shown) of motor control part 86 and systems control division 81.

Imaging apparatus 75 is an electric signal with the image transitions that transmission is fixed on the subjects of fixed lens group 72,85 on the lens barrel 88 and condenser lens 74 backs taking.Signal processing part 82 generates view data and the contrast information that is used to focus on adjustment according to the electric signal from imaging apparatus 75 outputs.

When connecting the power supply of camera body 89, export the instruction of condenser lens 74 to motor control part 86 to imaging apparatus 75 side drives from systems control division 81.Motor control part 86 reads the expression subject distance that is stored in the memory storage 85 and the information of the relation between the condenser lens position.At motor driving part 87,, make it reach desirable sense of rotation and rotation amount of movement to motor 9 output drive signals according to moving direction and mobile step information from motor control part 86.

When condenser lens 74 arrived the position that the dotted line among Figure 59 represents, photoelectric sensor 78 crested members 77 covered, and the output signal level of photoelectric sensor 78 changes.When this output signal level surpasses certain threshold value (perhaps according to circuit structure, when not reaching threshold value),, carry out the absolute position detection of condenser lens 74 with the counter reset that motor control part 86 has in advance.

Utilize the absolute position of detected like this condenser lens 74, can make the speed of the drawing in high speed of automatic focusing function, perhaps according to the absolute location information prediction of condenser lens 74 and the distance of subject.In addition, by using, can carry out the control of condenser lens position at motor control part 86 from the focal shift information of systems control division 81 outputs with from the information of the condenser lens position that memory storage 85 reads.

In addition, the technology of record also is and the relevant technology of replacing lens type image documentation equipment in the following patent documentation 2, be located at control part 119 in the lens unit 127 not only with reference to the lens cam data 120 that is stored in lens microcomputer inside in advance, also estimate signal with reference to passing the AF that comes by main body microcomputer 114, keep the AF evaluation of estimate to become maximum position on one side, Yi Bian become doubly action.

In addition, put down in writing the origin position testing agency of lens unit in the patent documentation 3.Figure 60 is the major part approximate three-dimensional map of an example of existing camera head.In Figure 60, the 91st, be fixed on the reset switch of reference position (reset position) testing agency on the static component (not shown).

As shown in the figure, reset switch 91 has " コ " font main body, and the 91b of horizontal plate portion of 91a of horizontal plate portion of main body top (below be called " top plate portion ") and below (below be called " base plate ") and the optical axis of optical system described later dispose abreast.Keep the outstanding tested drafting board of body can enter space between top plate portion 91a and the 91b from lens.

Below top plate portion 91a, light-emitting component is installed, on base plate 91b, is equipped with and the opposed photo detector of light-emitting component.Photo detector and light-emitting component constitute optical chopper, and photo detector is electrically connected with control device 90 on the circuit board through electric wiring W1.

The 92nd, keep the condenser lens of focus lens group to keep body.Keeping on the periphery of body 92, feeding screw threaded sheet (the perhaps nut spiral component) 92b with the bolt hole that is used to screw togather feeding bolt 98 is being installed.In addition, also be provided with: sleeve shaped sliding part 92c that can be chimeric slidably vertically on the 1st guide rod 96, and band U groove tab 92d that can be chimeric slidably vertically on the 2nd guide rod 97.And, also be provided with the top plate portion 91a that can enter reset switch 91 and the tested drafting board 92a between the base plate 91b.

Feeding bolt 98 extends abreast with the optical axis of camera lens, and is fixed on the axle of condenser lens driving with step motor 94.The 1st guide rod 96 and the 2nd guide rod 97 extend abreast with the optical axis of lens, and are fixed on the static component (not shown).

The 93rd, keep the zoom lens of variable focus lens package to keep body, be configured on the axis identical with predetermined distance with the axis of condenser lens maintenance body 92.Periphery at zoom lens maintenance body 93 is provided with feeding screw threaded sheet (or nut spiral component) 93b, and this feeding screw threaded sheet 93b has the bolt hole that screws togather with feeding bolt 99.

In addition, also be provided with: sleeve shaped sliding part 93c that can be chimeric slidably vertically on the 1st guide rod 96, and band U groove tab 93d that can be chimeric slidably vertically on the 2nd guide rod 97.Moreover, also be provided with the top plate portion 91a that can enter reset switch 91 and the tested drafting board 93a between the base plate 91b.Feeding bolt 99 extends abreast with the optical axis of lens, and, be fixed on zoom lens and drive on the axle of using step motor 95.

In addition, step motor 94 is connected with control device 90 by wiring W2, and step motor 95 is connected with control device 90 by wiring W3.

As above in the existing camera head of Gou Chenging, when by power switch (not shown) supply power, at first step motor 95 begins rotation, 99 rotations of feeding bolt.Thus, zoom lens keep body 93 to move along the preceding extreme direction of feeding bolt 99 to bolt 99.

Afterwards, when tested drafting board 93a enters between the top plate portion 91a of reset switch 91 and the base plate 91b, the light beam of the light-emitting component of reflector is blocked by tested drafting board 93a, control device 90 drives step motor 95 in view of the above when step number is counted, zoom lens support 93 is moved to initial set up position.

Then, step motor 94 rotations, condenser lens support 92 moves to the preceding extreme direction of feeding bolt 98, tested drafting board 92a enters between the top plate portion 91a of reset switch 91 and the base plate 91b and blocks the light of light-emitting component, at this moment, control device 90 is counted, is driven step motor 94 on one side step number on one side in view of the above, and condenser lens support 92 is moved to initial set up position.

Thus, in conventional device, utilize and be located at the common reset switch of tested drafting board on each lens support, the detection of carrying out each reset position of zoom lens and condenser lens is that initial point detects.

In addition, in patent documentation 4, the focus-regulating device that pulse (stepping) motor that drives in order to the 1-2 phase excitation mode drives the video camera of lens combination or aperture is disclosed.The focus-regulating device that is documented in the video camera on the patent documentation 4 has three impulse motors of aperture with impulse motor M1, focusing motor M2, zoom motor M3.Aperture utilizes the photoelectric sensor that is arranged with lens combination or aperture spring branch as driven member to carry out the initial point detection with impulse motor M1 and focusing with motor M2.Have, zoom motor M3 carries out the absolute position detection of lens combination by volume resistance (variohm) again, so does not carry out initial point detection itself.

In addition, patent documentation 5 discloses the lens driver with step motor.The lens driver of patent documentation 5 records from the predefined predetermined actions amount of this extreme position reverse drive, carries out initial point thus and detects after the lens as driven member are moved to the extreme position that mechanically can limit.Patent documentation 5 can carry out initial point accurately and detect by carrying out this control.

But, shown in Figure 58, in existing lens driver, be installed in the position relation of shading member on the lens unit and photoelectric sensor, because of gap, environment for use temperature and the humidity of the driving direction of lens unit changes mechanism and the electrical characteristics deviation equal error that causes, the absolute position is all different in each detection action, at aspects such as realization high image quality, is difficult to obtain sufficient performance.

In addition, also propose to have such method: the amount of movement of the shading member when shading member is swept away photoelectric sensor, use two different photoelectric sensors of deviation sensitivity of output level, the output of the photoelectric sensor that deviation sensitivity is big is signal to start with, detects origin position according to the output of the little photoelectric sensor of deviation sensitivity.According to this method, help improving the absolute position detection precision, but be unfavorable for simplification and cost aspect.

Have again, in the existing camera head shown in Figure 59, need respectively large-scale microcomputer that lens barrel side and camera body side are controlled, in changing camera lens formula camera head, be difficult to realize the densification and the cost degradation of lens barrel.In addition, produce the focal position deviation, be difficult to obtain sufficient performance owing to the environment for use temperature of lens barrel and humidity change the mechanism and the electrical characteristics deviation equal error that cause.

In addition.In the initial point detection mode of the existing camera head shown in Figure 60, detect moving of shading member with common photoelectric sensor, carried out the detection of origin position, but, because be configured in photoelectric sensor between two lens units and its position at the outer peripheral portion of unit, therefore the outer deformation of each lens unit is big, and it is large-scale that lens barrel has become.

Have again, need each lens unit is approaching mutually when taking in each lens unit, but this moment is not in order to be in contact with one another shading member, the physical dimension of photoelectric sensor need be become big, this has become the restraining factors of the miniaturization of the orthogonal directions of realizing optical axis direction and this optical axis direction, hinders the miniaturization of lens barrel.

In addition, in the initial point detection mode shown in Figure 60, when under abnormal state of affairs, finishing, have following problems.So-called abnormal state of affairs has following situation: voltage reduces owing to for example consume the battery capacity of supplying with camera head, or the splicing ear of this external power source situation former thereby that finish such as drop accidentally in the action of power supply externally.At this moment, if when connecting the power supply of camera head afterwards, the origin position that carries out Zoom lens unit usually detects to be handled.At this moment, under the situation of the light that reduces the shading member shield light electric transducer that is focused lens unit owing to voltage, can not normally carry out origin position and detect processing, have the problem that causes misoperation.As mentioned above, in the conventional example in the origin position that photoelectric sensor is common to Zoom lens unit and condenser lens unit detects, have several problems.

Have, the focus-regulating device of the video camera of being put down in writing at patent documentation 4 for the origin position that carries out step motor detects, needs structures such as photoelectric sensor in addition, has the problem of the miniaturization that can not realize camera head again.

Have again, the lens driver that patent documentation 5 is put down in writing detects origin position because driven member is moved to the extreme position that mechanically limits, therefore, have such problem: when stipulating from the former amount of movement of lighting, produce error according to the umber of pulse that is applied to step motor.This is because when driven member being abutted to the extreme position of mechanically restriction, driven member is with respect to extreme position, the direction of the magnetic force that rotor magnet is subjected to is according to on-position and difference, therefore according to the moment that origin position is set, produce two states, that is, the 1st kind of state is that driven member is driven to the direction near extreme position, and the 2nd kind of situation is that driven member is driven to the direction of leaving from extreme position.

Patent documentation 1:(Japan) spy opens flat 6-174999 communique;

Patent documentation 2:(Japan) spy opens flat 9-23366 communique;

Patent documentation 3:(Japan) spy opens flat 4-184309 communique;

Patent documentation 4:(Japan) spy opens flat 10-224680 communique;

Patent documentation 5:(Japan) spy opens flat 8-76005 communique.

Summary of the invention

The present invention makes for solving above-mentioned prior art problem, its purpose is to provide a kind of lens driver, do not damage densification and prevent to produce the detection error of origin position, in camera head, realize the densification and the cost degradation of lens barrel.Its purpose also is, provides a kind of and can carry out camera head and the lens driver that initial point detects and hi-Fix is controlled smoothly.

For achieving the above object, the 1st kind of lens driver of the present invention possesses: imaging lens system comprises the focusing lens that subject carried out imaging; Picture pick-up device is made a video recording to the object light that is produced by above-mentioned imaging lens system; The lens position control gear comprises the driving mechanism that above-mentioned imaging lens system is moved on optical axis direction with respect to lens barrel, and output has periodic drive signal, thus the position by the above-mentioned imaging lens system of above-mentioned driving mechanisms control; Position-detection sensor, output valve is according to the change in location of above-mentioned imaging lens system; The lens position arithmetical organ, the phase place of the above-mentioned drive signal the when output valve of above-mentioned position-detection sensor is arrived threshold value is obtained as the reference position of above-mentioned imaging lens system; And the reference position storing mechanism, storage said reference position; Said lens position arithmetical organ will carry out the position of additive operation or subtraction to the said reference position of reading from said reference location storage mechanism, obtain as the judgement position; By and drive the synchronous timing of drive signal of above-mentioned driving mechanism, and in the output valve of the above-mentioned position-detection sensor of above-mentioned judgement position probing; Judge and above-mentionedly judge that whether the output valve of locational above-mentioned position-detection sensor arrives above-mentioned threshold value, obtains the said reference position once more.

For achieving the above object, the 2nd kind of lens driver of the present invention possesses: imaging lens system comprises the focusing lens that subject carried out imaging; Picture pick-up device is made a video recording to the object light that is produced by above-mentioned imaging lens system; The lens position control gear comprises the driving mechanism that above-mentioned imaging lens system is moved on optical axis direction with respect to lens barrel, and output has periodic drive signal, thus the position by the above-mentioned imaging lens system of above-mentioned driving mechanisms control; Position-detection sensor, output valve is according to the change in location of above-mentioned imaging lens system; The lens position arithmetical organ, the phase place of the above-mentioned drive signal the when output valve of above-mentioned position-detection sensor is arrived first threshold is obtained as the reference position of above-mentioned imaging lens system; And the reference position storing mechanism, storage said reference position; Said lens position arithmetical organ, will with the position of the said reference position same phase of reading from said reference location storage mechanism as judging the position; By and drive the synchronous timing of drive signal of above-mentioned driving mechanism, and in the output valve of the above-mentioned position-detection sensor of above-mentioned judgement position probing; Judge that whether the above-mentioned output valve of judging locational above-mentioned position-detection sensor reaches the 2nd threshold value with above-mentioned the 1st threshold value different value, obtains the said reference position once more.

The 1st kind of camera head of the present invention, lens barrel and camera body are separable, and the said lens lens barrel possesses: the imaging lens system group, comprise condenser lens, subject is carried out imaging; Motor drive mechanism comprises the motor that above-mentioned condenser lens is moved on optical axis direction; Storing mechanism has been stored the information table of the control information that comprises above-mentioned condenser lens; And the 1st data transmit-receive mechanism, will send to above-mentioned camera body from the information of above-mentioned storing mechanism output; Above-mentioned camera body possesses: picture pick-up device, the object light that is produced by above-mentioned imaging lens system group is made a video recording; The 2nd data transmit-receive mechanism receives the information that sends from above-mentioned the 1st data transmit-receive mechanism; And the motor control gear, according to reception information from the output of above-mentioned the 2nd data transmit-receive mechanism, the control said motor; Through the information that above-mentioned the 2nd data transmit-receive mechanism sends to above-mentioned the 1st data transmit-receive mechanism, control above-mentioned condenser lens according to the said motor control gear.

Lens barrel of the present invention possesses: the imaging lens system group, comprise condenser lens, and subject is carried out imaging; And motor drive mechanism, comprise the motor that above-mentioned condenser lens is moved on optical axis direction; Also possess: storing mechanism, storage comprises the information table of the control information of above-mentioned condenser lens; And the 1st data transmit-receive mechanism, will send to above-mentioned camera body from the information of above-mentioned storing mechanism output; The said lens lens barrel is used for camera body, and this camera body comprises the motor control gear that the information of the above-mentioned condenser lens of control is exported via the 2nd data transmit-receive mechanism; Via the information that above-mentioned the 2nd data transmit-receive mechanism sends to above-mentioned the 1st data transmit-receive mechanism, control above-mentioned condenser lens according to the said motor control gear.

Camera body of the present invention, a kind of camera body is used for lens barrel, and this lens barrel possesses: the imaging lens system group, comprise condenser lens, subject is carried out imaging; Motor drive mechanism comprises the motor that above-mentioned condenser lens is moved on optical axis direction; Storing mechanism has been stored the information table of the control information that comprises above-mentioned condenser lens; The 1st data transmit-receive mechanism will send to above-mentioned camera body from the information of above-mentioned storing mechanism output; Above-mentioned camera body comprises: picture pick-up device, the object light that is produced by above-mentioned imaging lens system group is made a video recording; The 2nd data transmit-receive mechanism receives the information that sends from above-mentioned the 1st data transmit-receive mechanism; The motor control gear, according to reception information from the output of above-mentioned the 2nd data transmit-receive mechanism, the control said motor; The said motor control gear is upwards stated the information that the 1st data transmit-receive mechanism sends the above-mentioned condenser lens of control via above-mentioned the 2nd data transmit-receive mechanism.

The 2nd kind of camera head of the present invention comprises: lens barrel is set to the 1st lens unit and the 2nd lens unit respectively and can moves on optical axis direction; The 1st driving mechanism moves above-mentioned the 1st lens unit on optical axis direction; The 2nd driving mechanism moves above-mentioned the 2nd lens unit on optical axis direction; Control gear is respectively to above-mentioned the 1st driving mechanism and above-mentioned the 2nd driving mechanism output control signal; Position detecting mechanism detects the position of above-mentioned the 2nd lens unit, and, move by the butt of above-mentioned the 1st lens unit and above-mentioned the 2nd lens unit is caused, detect the position of above-mentioned the 1st lens unit.

The 3rd kind of camera head of the present invention comprises: power supply; Lens barrel has the 1st lens unit and the 2nd lens unit, and the 1st lens unit and the 2nd lens unit are removable on optical axis direction respectively; The 1st driving mechanism moves above-mentioned the 1st lens unit on optical axis direction; The 2nd driving mechanism moves above-mentioned the 2nd lens unit on optical axis direction; Control gear from above-mentioned power supply supply power the time and when cutting off the electricity supply, moves above-mentioned the 1st lens unit by above-mentioned the 1st driving mechanism at least, carries out predefined power supply when supplying with and the processing action during dump; Storing mechanism, the information different with the abnormal ending state storage according to the normal termination state, described normal termination state refers to cut off the electricity supply when supplying with from above-mentioned power supply supply condition, make above-mentioned the 1st lens unit and the 2nd lens unit move to the state of reception position according to predefined processing action, described abnormal ending state is meant under above-mentioned power supply supply condition, with the state of the state end different with above-mentioned normal termination state; By the supply of the power supply behind the above-mentioned abnormal ending state and according to the information that is stored in the above-mentioned storing mechanism, make above-mentioned the 1st lens unit and the 2nd lens unit return to above-mentioned normal termination state.

Drive unit of the present invention drives driven member, and it possesses: the restriction end, limit moving of above-mentioned driven member; Step motor changes the rotation of the rotor that carries out by following on-position, drives above-mentioned driven member, and above-mentioned on-position changes the pattern corresponding to exciting current; Driver is supplied with above-mentioned exciting current to above-mentioned step motor; The origin position storage part is being stored the on-position corresponding with the origin position of above-mentioned driven member in advance; Count section, the above-mentioned on-position that the pattern of the above-mentioned exciting current supplied with above-mentioned driver is changed accordingly and count with the absolute position of the corresponding above-mentioned driven member of above-mentioned on-position; And operational part, above-mentioned origin position is resetted; The above-mentioned on-position that is stored in the above-mentioned origin position storage part is, when advancing above-mentioned on-position so that further advancing above-mentioned on-position under the mobile state that is limited by above-mentioned restriction end of above-mentioned driven member near above-mentioned restriction end and above-mentioned driven member, above-mentioned rotor is subjected to magnetic force so that the on-position that above-mentioned driven member leaves from above-mentioned restriction end.

The 3rd kind of lens driver of the present invention possesses above-mentioned drive unit, and above-mentioned driven member is the lens holding frames that keeps lens element.

Description of drawings

Fig. 1 is the skeleton diagram and the block diagram of the lens driver of first embodiment of the invention.

Fig. 2 is the detailed diagram of the focus motor control part of first embodiment of the invention.

Fig. 3 is that the initial point of the operation of first embodiment of the invention when adjusting detects action specification figure.

Fig. 4 is that the initial point of the operation of first embodiment of the invention when adjusting detects action flow chart.

Initial point when Fig. 5 is the common use of first embodiment of the invention detects action specification figure.

Initial point when Fig. 6 is the common use of first embodiment of the invention detects action flow chart.

Fig. 7 is the zoom position of expression first embodiment of the invention and the chart of focal position relation.

Initial point when Fig. 8 is the common use of expression second embodiment of the invention detects action specification figure.

Initial point when Fig. 9 is the common use of second embodiment of the invention detects action flow chart.

Figure 10 is that the initial point of the operation of third embodiment of the invention when adjusting detects action specification figure.

Initial point when Figure 11 is the common use of third embodiment of the invention detects action specification figure.

Initial point when Figure 12 is the common use of four embodiment of the invention detects action specification figure.

Figure 13 is the process flow diagram that the power-off of four embodiment of the invention is handled.

Figure 14 is that the initial point of the operation of fifth embodiment of the invention when adjusting detects action specification figure.

Figure 15 is that the initial point of the operation of fifth embodiment of the invention when adjusting detects action flow chart.

Figure 16 is the block diagram of the lens driver of sixth embodiment of the invention.

Figure 17 is the action specification figure of the angle detecting sensor of sixth embodiment of the invention.

Initial point when Figure 18 is the common use of sixth embodiment of the invention detects action specification figure.

Initial point when Figure 19 is the common use of sixth embodiment of the invention detects action flow chart.

Figure 20 is the zoom position of expression sixth embodiment of the invention and the chart of focal position relation.

Figure 21 is that the initial point of the operation of seventh embodiment of the invention when adjusting detects action specification figure.

Figure 22 is that the initial point of the operation of seventh embodiment of the invention when adjusting detects action flow chart.

Initial point when Figure 23 is the common use of seventh embodiment of the invention detects action specification figure.

Initial point when Figure 24 is the common use of seventh embodiment of the invention detects action flow chart.

Initial point when Figure 25 is the common use of eighth embodiment of the invention detects action specification figure.

Initial point when Figure 26 is the common use of eighth embodiment of the invention detects action flow chart.

Initial point when Figure 27 is the common use of ninth embodiment of the invention detects action specification figure.

Figure 28 is the process flow diagram that the power-off of ninth embodiment of the invention is handled.

Figure 29 is that the initial point of the operation of tenth embodiment of the invention when adjusting detects action specification figure.

Figure 30 is that the initial point of the operation of tenth embodiment of the invention when adjusting detects action flow chart.

Initial point when Figure 31 is the common use of eleventh embodiment of the invention detects action specification figure.

Initial point when Figure 32 is the common use of eleventh embodiment of the invention detects action flow chart.

Figure 33 is the skeleton diagram and the block diagram of the camera head of twelveth embodiment of the invention.

Figure 34 is the block diagram of the motor control part of twelveth embodiment of the invention.

Figure 35 is the action specification figure of the data transmit-receive portion of twelveth embodiment of the invention.

Figure 36 is the lens initialization action process flow diagram of twelveth embodiment of the invention.

Initial point when Figure 37 is the adjustment of twelveth embodiment of the invention operation detects action specification figure.

Initial point when Figure 38 is the adjustment of twelveth embodiment of the invention operation detects action flow chart.

Figure 39 is the figure of the temperature and the focal position correcting value relation of expression twelveth embodiment of the invention.

Figure 40 is the schematic block diagram of the camera head of expression thirteenth embodiment of the invention.

Figure 41 is the pattern migration key diagram of each lens unit of thirteenth embodiment of the invention.

Figure 42 is that the power supply of thirteenth embodiment of the invention is supplied with the action flow chart when handling.

Power supply when Figure 43 is thirteenth embodiment of the invention common is supplied with the action flow chart when handling.

Power supply when Figure 44 is thirteenth embodiment of the invention unusual is supplied with the action flow chart when handling.

Figure 45 is the action flow chart of the dump of thirteenth embodiment of the invention when handling.

Figure 46 is that the origin position of the lens unit of thirteenth embodiment of the invention detects action specification figure.

Figure 47 is the skeleton diagram and the block diagram of the camera head of fourteenth embodiment of the invention.

Figure 48 is the control circuit detailed diagram of the camera head of fourteenth embodiment of the invention.

Figure 49 is the motor part of camera head of fourteenth embodiment of the invention and the block diagram of focus driver.

Figure 50 is the sequential chart of the current-mode of the A phase coil that is applied to motor part of camera head of expression fourteenth embodiment of the invention and the exciting current on the B phase coil.

Figure 51 is a mode chart of holding the relation of the on-position of motor part of remote location and activation point in the camera head of expression fourteenth embodiment of the invention from restriction.

Figure 52 is the mode chart of the relation of near the on-position of the motor part restriction end in the camera head of expression fourteenth embodiment of the invention and activation point.

Figure 53 be the expression fourteenth embodiment of the invention camera head rotor magnet the mode chart of the relation between stressed direction and the on-position numbering.

Figure 54 is the key diagram of rotor action that is used to illustrate the camera head of fourteenth embodiment of the invention.

Figure 55 is the action flow chart of initial point reset processing of the camera head of fourteenth embodiment of the invention.

Figure 56 is motor part and the block diagram of aperture driver and the mode chart of aperture portion of the camera head of fifteenth embodiment of the invention.

Figure 57 is near the mode chart of the aperture portion the restriction end of camera head of fifteenth embodiment of the invention.

Figure 58 is the skeleton diagram and the block diagram of an example of existing lens driver.

Figure 59 is the skeleton diagram and the block diagram of an example of existing camera head.

Figure 60 is the major part approximate three-dimensional map of an example of existing camera head.

Embodiment

The 1st kind of lens driver of the present invention, when using usually, directly do not detect the reference position of obtaining when operation is adjusted, and pass through in the locational judgement of the judgement different with the reference position, detect the reference position, therefore, can prevent the generation of the detection error of the origin position that the deviation of the mechanism of lens unit and electrical characteristics etc. causes.

In the 1st kind of lens driver of the invention described above, preferably, the drive signal of the above-mentioned driving mechanism of driving when asking the said reference position is a sine wave signal roughly.。According to this structure, can significantly improve the reference position precision.

In addition, in the 1st kind of lens driver of the invention described above, preferably, be T 1 cycle length of the drive signal of the above-mentioned driving mechanism of driving when asking the said reference position;

If N=2n, M are that the drive signal of the above-mentioned driving mechanism of driving when asking the said reference position once more is the M/N periodic drive signal that the time in 1 cycle becomes (M/N) T when satisfying the integer of 2n＞M＞2, wherein n is the integer more than 2.According to this structure, the initial point the when speed doubly of the N/M in the time of can adjusting with operation is used usually detects action.

In addition, preferably, above-mentioned judgement position is the position of leaving 1/2 cycle of above-mentioned drive signal since the said reference position that said reference location storage mechanism reads.

In addition, preferably, above-mentioned judgement position is the position of leaving 1/2 cycle of above-mentioned M/N periodic drive signal since the said reference position that said reference location storage mechanism reads.According to these structures, judge that the interval between the position becomes 1 cycle of drive signal, between the judgement position, comprise origin position (reference position), therefore, can reproduce initial point reliably.

In addition, preferably, said lens position arithmetical organ is made as stop position with above-mentioned judgement position, and the said lens position control mechanism moved to above-mentioned stop position with above-mentioned imaging lens system before the power supply that cuts off the said lens drive unit.According to this structure, can reduce the judgement number of times, the initial point recovery time accelerates.

In addition, preferably, said lens position arithmetical organ will be obtained as stop position the position that additive operation or subtraction have been carried out in the said reference position, the said lens control gear is before the power supply that cuts off the said lens drive unit, above-mentioned imaging lens system is moved to above-mentioned stop position, and above-mentioned stop position is the position of leaving 1/2 cycle of above-mentioned drive signal from the said reference position.

Have again, preferably, said lens position arithmetical organ will be obtained as stop position the position that additive operation or subtraction have been carried out in the said reference position, the said lens control gear is before the power supply that cuts off the said lens drive unit, above-mentioned imaging lens system is moved to above-mentioned stop position, and above-mentioned stop position is the position of leaving 1/2 cycle of above-mentioned M/N periodic drive signal from the said reference position.According to these structures, only just can reliably carry out initial point and detect with initial once judgement.

In addition, the most still, the angular transducer that also possesses the angle of inclination of detecting the said lens lens barrel, said lens position arithmetical organ be according to the angle of inclination information from the said lens lens barrel of above-mentioned angular transducer output, obtain with from the suitable correction distance of the displacement of benchmark angle; Said lens position arithmetical organ, the position of the above-mentioned correction distance that will add deduct on above-mentioned judgement position is as new judgement position; With detecting the output valve of above-mentioned position-detection sensor and the position of carrying out above-mentioned judgement, as above-mentioned new judgement position.According to this structure, when usually using and operation when adjusting, the angle of inclination difference of lens barrel is even under the situation of the change location change of photoelectric sensor output level, also can prevent the deviation that initial point detects.

In addition, preferably, the angular transducer that also possesses the angle of inclination of detecting the said lens lens barrel, the said lens position control mechanism is according to correction position information, control the position of above-mentioned imaging lens system, above-mentioned correction position information is based on the information of said reference position with from the angle of inclination information of the said lens lens barrel of above-mentioned angular transducer output.

In addition, preferably, said lens position arithmetical organ is under with said lens lens barrel state up, and the phase place of the drive signal the when output valve of above-mentioned position-detection sensor is arrived threshold value is obtained as the upper end position of imaging lens system; Under said lens lens barrel state down, the phase place of the drive signal the when output valve of above-mentioned position-detection sensor is arrived threshold value is obtained as the lower end position of imaging lens system; Calculate the said reference position according to above-mentioned upper end position and above-mentioned lower end position.According to this structure, when usually using and operation when adjusting, even lens barrel under different situations, also can prevent the deviation that initial point detects.

In addition, preferably, said lens position arithmetical organ calculates the centre position between above-mentioned upper end position and the above-mentioned lower end position as the said reference position.

In addition, preferably, the lens position arithmetical organ is under the state that lens barrel faces upward or downward, the phase place of the drive signal the when output valve of above-mentioned position-detection sensor is arrived threshold value, upper end or lower end position as imaging lens system are obtained, and above-mentioned upper end or the lower end position predetermined distance that adds deduct is calculated the said reference position.According to this structure, when usually using and operation when adjusting, even lens barrel under different situations, also can prevent the deviation that initial point detects.The initial point that this structure is suitable for causing by specification specifies posture difference detects the camera head of deviation.

In addition, preferably, the temperature sensor that also possesses the temperature that detects the said lens lens barrel, said lens position arithmetical organ be according to the temperature information from the said lens lens barrel of said temperature sensor output, obtain with from the suitable correction distance of the displacement of reference temperature; Said lens position arithmetical organ, the position of the above-mentioned correction distance that will add deduct on above-mentioned judgement position are as new judgement position, with detecting the output valve of above-mentioned position-detection sensor and the position of carrying out above-mentioned judgement, as above-mentioned new judgement position.According to this structure, when usually using and operation when adjusting, even under the situation of the change location change of the temperature difference of lens barrel, photoelectric sensor output level, also can prevent the deviation that initial point detects.

In addition, preferably, the temperature sensor that also possesses the temperature that detects the said lens lens barrel, the said lens position control mechanism is according to correction position information, control the position of above-mentioned imaging lens system, above-mentioned correction position information is based on the said reference positional information with from the temperature information of the said lens lens barrel of said temperature sensor output.

In addition, preferably, also possess the angular transducer at the angle of inclination of detecting the said lens lens barrel and detect the temperature sensor of the temperature of said lens lens barrel; Said lens position arithmetical organ is according to the angle of inclination information of the said lens lens barrel of exporting from above-mentioned angular transducer, obtain with from the suitable angularity correction distance of the displacement of benchmark angle, according to temperature information from the said lens lens barrel of said temperature sensor output, obtain with from the suitable temperature correction distance of the displacement of reference temperature; The position of the above-mentioned angularity correction distance that will add deduct on above-mentioned judgement position and the total distance of said temperature correction distance is as new judgement position; With detecting the output valve of above-mentioned position-detection sensor and the position of carrying out above-mentioned judgement, as above-mentioned new judgement position.According to this structure, when usually using and operation when adjusting, even under the situation of the change location change of the temperature difference of lens barrel, photoelectric sensor output level, also can prevent the deviation that initial point detects.

The 2nd kind of lens driver of the present invention, the threshold setting of the output valve of the position-detection sensor of the judgment standard by will be as common use the time is the different value of threshold value when adjusting with operation, come the detection reference position, therefore, can prevent that the deviation because of the mechanism of lens unit and electrical characteristics etc. from producing the detection error of origin position.

In the 2nd kind of lens driver of the invention described above, preferably, be T 1 cycle length of the drive signal of the above-mentioned driving mechanism of driving when asking the said reference position, the drive signal of the above-mentioned driving mechanism of driving when asking the said reference position once more is the 1/N periodic drive signal that becomes T/N 1 cycle length, wherein, N is 2 above integers.According to this structure, the initial point the when speed doubly of the N in the time of can adjusting with operation is used usually detects action.

In addition, preferably, above-mentioned the 2nd threshold value is the value in the output valve scope of the above-mentioned position-detection sensor between the position in said reference position and 1 cycle of leaving above-mentioned drive signal from the said reference position.In addition, preferably, above-mentioned the 2nd threshold value is to leave the output valve of above-mentioned position-detection sensor of position in 1/2 cycle of above-mentioned drive signal from the said reference position.According to these structures,, therefore reliably realize that initial point reproduces because output valve that must the location detecting sensor comprises the interval between the judgement position of the 2nd threshold value.

In addition, preferably, said lens position arithmetical organ is made as stop position with above-mentioned judgement position, and the said lens position control mechanism moved to above-mentioned stop position with above-mentioned imaging lens system before the power supply that cuts off the said lens drive unit.According to this structure, can reduce the judgement number of times, realize that reliably initial point reproduces.

In addition, preferably, said lens position arithmetical organ will be than leading judgement position, the judgement position corresponding with the above-mentioned reference position of obtaining once more as stop position, the said lens position control mechanism moved to above-mentioned stop position with above-mentioned imaging lens system before the power supply that cuts off the said lens drive unit.According to this structure, only, just can reliably carry out initial point and detect with 1 time initial judgement.

In addition, preferably, the angular transducer that also possesses the angle of inclination of detecting the said lens lens barrel, said lens position arithmetical organ be according to the angle of inclination information from the said lens lens barrel of above-mentioned angular transducer output, obtain with from the suitable correction distance of the displacement of benchmark angle; Said lens position arithmetical organ, the position of the above-mentioned correction distance that will add deduct on above-mentioned judgement position is as new judgement position, with detecting the output valve of above-mentioned position-detection sensor and the position of carrying out above-mentioned judgement, as above-mentioned new judgement position.According to this structure, when usually using and operation when adjusting, even under the situation of the change location change of the temperature difference of lens barrel, photoelectric sensor output level, also can prevent the deviation that initial point detects.

In addition, preferably, the angular transducer that also possesses the angle of inclination of detecting the said lens lens barrel, the said lens position control mechanism is according to correction position information, control the position of above-mentioned imaging lens system, above-mentioned correction position information is based on the information of said reference position with from the angle of inclination information of the said lens lens barrel of above-mentioned angular transducer output.

In addition, preferably, said lens position arithmetical organ, under with said lens lens barrel state up, the phase place of the drive signal the when output valve of above-mentioned position-detection sensor is arrived above-mentioned the 1st threshold value is obtained as the upper end position of imaging lens system; Under said lens lens barrel state down, the phase place of the drive signal the when output valve of above-mentioned position-detection sensor is arrived threshold value is obtained as the lower end position of imaging lens system; Calculate the said reference position according to above-mentioned upper end position and above-mentioned lower end position.According to this structure, when usually using and operation when adjusting, even at lens barrel under different situations, also can prevent the deviation that initial point detects.

In addition, preferably, said lens position arithmetical organ is with the centre position between above-mentioned upper end position and the above-mentioned lower end position, as the said reference position calculation.

In addition, preferably, the lens position arithmetical organ is under the state that lens barrel faces upward or downward, the phase place of the drive signal the when output valve of above-mentioned position-detection sensor is arrived above-mentioned the 1st threshold value, upper end or lower end position as imaging lens system are obtained, and above-mentioned upper end or the lower end position predetermined distance that adds deduct is calculated the said reference position.According to this structure, when usually using and operation when adjusting, even lens barrel under different situations, also can prevent the deviation that initial point detects.The camera head of the deviation that the initial point that this structure is suitable for causing because of the posture difference by specification specifies detects.

In addition, preferably, the temperature sensor that also possesses the temperature that detects the said lens lens barrel, said lens position arithmetical organ be according to the temperature information from the said lens lens barrel of said temperature sensor output, obtain with from the suitable correction distance of the displacement of reference temperature; Said lens position arithmetical organ, the position of the above-mentioned correction distance that will add deduct on above-mentioned judgement position is as new judgement position; With detecting the output valve of above-mentioned position-detection sensor and the position of carrying out above-mentioned judgement, as above-mentioned new judgement position.According to this structure, when usually using and operation when adjusting, even under the situation of the change location change of the temperature difference of lens barrel, photoelectric sensor output level, also can prevent the deviation that initial point detects.

In addition, preferably, the temperature sensor that also possesses the temperature that detects lens barrel, the said lens position control mechanism is according to the position of the above-mentioned imaging lens system of correction position information Control, and above-mentioned correction position information is based on the said reference positional information with from the temperature information of the said lens lens barrel of said temperature sensor output.

In addition, preferably, also possess the angular transducer at the angle of inclination of detecting the said lens lens barrel and detect the temperature sensor of the temperature of said lens lens barrel; Said lens position arithmetical organ, angle of inclination information according to the said lens lens barrel of exporting from above-mentioned angular transducer, obtain with from the suitable angularity correction distance of the displacement of benchmark angle, according to temperature information from the said lens lens barrel of said temperature sensor output, obtain with from the suitable temperature correction distance of the displacement of reference temperature; The position of the above-mentioned angularity correction distance that will add deduct on above-mentioned judgement position and the total distance of said temperature correction distance is as new judgement position; With detecting the output valve of above-mentioned position-detection sensor and the position of carrying out above-mentioned judgement, as above-mentioned new judgement position.According to this structure, when usually using and operation when adjusting, even under the situation of the change location change of the angle of inclination of lens barrel and temperature difference, photoelectric sensor output level, also can prevent the deviation that initial point detects.

According to camera head of the present invention, because the motor control part is located on the camera body, therefore can significantly cut down the circuit structure of lens barrel, can realize the densification and the cost degradation of lens barrel.In addition because the control information of condenser lens in the lens barrel is stored in the storing mechanism in the lens barrel, therefore, can with the irrespectively high-precision control of carrying out condenser lens of the kind of lens barrel.

Lens barrel of the present invention, the camera body that reaches control part is its prerequisite so that apparatus is saddled a horse for riding, and therefore, can significantly cut down the circuit structure of lens barrel, can realize the densification and the cost degradation of lens barrel.In addition.Because the control information of the condenser lens in the lens barrel is stored in the interior storing mechanism of lens barrel, therefore, if this control information is sent to the motor control part of camera body, then the motor control part can access the kind control information corresponding with lens barrel, therefore can carry out the control of condenser lens accurately.

According to camera body of the present invention, owing to possess the motor control part, therefore, can omit the motor control part, can be applicable to the circuit structure of simplifying lens barrel, the lens barrel of having realized densification and cost degradation.

In the 1st kind of camera head of the invention described above, preferably, the said motor driving mechanism is according to the reception information from the output of said motor control gear, output has periodic drive signal, said motor moves above-mentioned condenser lens according to the above-mentioned drive signal of above-mentioned output on optical axis direction; The said lens lens barrel also possesses the position-detection sensor that output valve changes according to the position of above-mentioned condenser lens; The phase place of the above-mentioned drive signal when the said motor control gear reaches threshold value with the output valve of above-mentioned position-detection sensor, reference position as above-mentioned condenser lens is obtained, and, transmit the information of said reference position through the above-mentioned the 2nd and the 1st data transmit-receive mechanism, store as the information of the above-mentioned information table of above-mentioned storing mechanism.According to this structure, the reference position information that is stored in advance in the above-mentioned information table can be used as the information when resetting the reference position when using usually when operation is adjusted.

In addition, preferably, the said motor control gear will be obtained as the judgement position carried out the position of additive operation or subtraction from the said reference position that above-mentioned storing mechanism is read through the above-mentioned the 1st and the 2nd data transmit-receive mechanism; With the synchronous timing of drive signal that drives the said motor driving mechanism, and detect the output valve of above-mentioned position-detection sensor through the above-mentioned the 1st and the 2nd data transmit-receive mechanism in above-mentioned judgement position, judge and above-mentionedly judge that whether the output valve of the above-mentioned position-detection sensor of position reaches above-mentioned threshold value, obtains the said reference position once more.According to this structure, when using usually, directly do not detect the reference position of obtaining when operation is adjusted, and pass through in the locational judgement of the judgement different with the reference position, detect the reference position, therefore, can prevent the generation of the detection error of the origin position that the deviation of the mechanism of lens unit and electrical characteristics etc. causes.

In addition, preferably, above-mentioned judgement position is the position of leaving 1/2 cycle of above-mentioned drive signal since the said reference position that above-mentioned storing mechanism is read.According to this structure, judge that the interval between the position becomes 1 cycle of drive signal, between the judgement position, comprise the reference position, the therefore reliable reproduction that realizes origin position.

In addition, preferably, above-mentioned information table comprises at least one in the information of maximum drive speed of the information of driving voltage of information, said motor of rotation resolution of information, said motor of the number of magnetic poles of said motor and said motor.

In addition, preferably, above-mentioned camera head also possesses temperature sensor, above-mentioned information table comprises the control information based on the position of the above-mentioned condenser lens of temperature, the said motor control gear is based on the temperature information and the above-mentioned control information of said temperature sensor, the position of proofreading and correct above-mentioned condenser lens according to temperature variation.According to this structure,, also can guarantee focusing position even under the situation that has produced temperature variation.

In addition, preferably, above-mentioned camera head also possesses angular transducer, above-mentioned information table comprises the control information based on the position of the above-mentioned condenser lens of posture angle, the said motor control gear changes the position of proofreading and correct above-mentioned condenser lens based on the angle information and the above-mentioned control information of above-mentioned angular transducer according to angle.According to this structure, even under the situation that has produced the posture angle, also can guarantee focusing position.

Preferably, above-mentioned information table comprises the information of the life cycle of said motor, and the information of above-mentioned life cycle is upgraded according to the displacement or the traveling time that play the above-mentioned condenser lens of power supply between tailend from above-mentioned camera head power connection.According to this structure, can be with life cycle information as the information of changing relevant maintenances such as motor period.

In addition, any in motor, electrostatic motor and the piezo-electric motor that preferably, said motor is step motor, linear motor, ultrasonic motor, be made of the smooth impact driving mechanism.

In addition, preferably, added parity check bit in the transceive data between above-mentioned the 1st transmitting-receiving mechanism and above-mentioned the 2nd transmitting-receiving mechanism.According to this structure, can confirm whether transceive data is received and dispatched reliably.

In the said lens lens barrel, preferably, the said lens lens barrel also possesses the position-detection sensor that output valve changes according to the position of above-mentioned condenser lens; With having periodic drive said motor and making above-mentioned condenser lens on optical axis direction when mobile according to above-mentioned drive signal, the phase place of the above-mentioned drive signal the when output valve of above-mentioned position-detection sensor is reached threshold value, as the reference position of above-mentioned condenser lens, the information of said reference position is stored as the information of the above-mentioned information table of above-mentioned storing mechanism.According to this structure, be stored in the reference position information in the information table in the time of operation can being adjusted in advance, the information when resetting the reference position during as common the use.

In addition, preferably, above-mentioned information table comprises at least one in the information of maximum drive speed of the information of driving voltage of information, said motor of displacement resolution of information, said motor of the number of magnetic poles of said motor and said motor.

In addition, preferably, above-mentioned information table comprises the control information based on the position of the above-mentioned condenser lens of temperature.According to this structure,, also can use the position correction information of condenser lens to guarantee focusing position even under the situation that has produced temperature variation.

In addition, preferably, above-mentioned information table comprises the control information based on the position of the above-mentioned condenser lens of posture angle.According to this structure,, also can use the position correction information of condenser lens to guarantee focusing position even under the situation that has produced the posture angle.

In addition, preferably, above-mentioned information table can be stored the information of the life cycle of said motor.According to this structure, can be with the information of life cycle information as the relevant maintenances such as replacing period of motor.

In addition, any in motor, electrostatic motor and the piezo-electric motor that preferably, said motor is step motor, linear motor, ultrasonic motor, be made of the smooth impact driving mechanism.

In addition, preferably, added parity check bit in the transceive data between above-mentioned the 1st transmitting-receiving mechanism and above-mentioned the 2nd transmitting-receiving mechanism.According to this structure, can confirm whether transceive data is is reliably received and dispatched.

In addition, according to the 2nd kind of camera head of the present invention, owing to the position probing of carrying out the 1st lens unit and the 2nd lens unit with common position detecting mechanism, so the component count minimizing, can realize the optical axis direction of lens barrel and the miniaturization of peripheral direction.

In the 2nd kind of camera head of the invention described above, preferably, above-mentioned position detecting mechanism possesses: the detected member that moves on optical axis direction with above-mentioned the 2nd lens unit; And, detect the sensor of the position on the optical axis direction of above-mentioned detected member.

In addition, preferably, by moving by above-mentioned the 1st lens unit of above-mentioned the 1st drive mechanism, make after above-mentioned the 1st lens unit and above-mentioned the 2nd lens unit butt, above-mentioned the 2nd lens unit and above-mentioned the 1st lens unit are together moved, detect and be somebody's turn to do the position of the mobile detected member that together moves by position detecting mechanism, thereby detect the position of above-mentioned the 1st lens unit.

In addition, preferably, make after above-mentioned the 1st lens unit and above-mentioned the 2nd lens unit together move by above-mentioned the 1st driving mechanism, move above-mentioned the 2nd lens unit by above-mentioned the 2nd driving mechanism, detect and be somebody's turn to do the position of the mobile detected member that together moves by above-mentioned position-detection sensor, thereby detect the position of above-mentioned the 2nd lens unit.

In addition, preferably, above-mentioned the 2nd lens unit can move on optical axis direction along supporting member, by the movement limiting portion that is moved by above-mentioned the 2nd driving mechanism, carries out moving based on above-mentioned the 2nd lens unit of above-mentioned the 2nd drive mechanism; Moving of above-mentioned the 2nd lens unit of above-mentioned the 1st drive unit drives, by carrying out with the mobile transfer part of above-mentioned the 1st lens unit interlock, with above-mentioned movement limiting portion and above-mentioned mobile transfer part together be configured in above-mentioned supporting member near.

In addition, preferably, above-mentioned position detecting mechanism is a transmittance type sensor, and above-mentioned detected member is the light shading member of above-mentioned transmittance type sensor.

In addition, preferably, above-mentioned the 1st lens unit is a Zoom lens unit, and above-mentioned the 2nd lens unit is the condenser lens unit.

According to the 3rd kind of camera head of the present invention, even at the power supply of supplying with camera head from the outside under situation about stopping under the up-set conditions such as cut-outs suddenly, when connecting the power supply of camera head next time, can carry out origin position smoothly and detect processing, return to normal condition.

In above-mentioned the 3rd camera head, preferably, by the supply of the power supply behind the above-mentioned abnormal ending state and according to the information that is stored in the above-mentioned storing mechanism, make above-mentioned the 1st lens unit and the 2nd lens unit return to above-mentioned normal termination state, and, at least by above-mentioned the 1st driving mechanism above-mentioned the 1st lens unit is moved, carry out the processing action when supplying with of predefined power supply.

In addition, preferably, above-mentioned storing mechanism is nonvolatile memory or the volatile memory that drives by secondary power.

In addition, preferably, above-mentioned the 1st lens unit is a Zoom lens unit, and above-mentioned the 2nd lens unit is the condenser lens unit.

According to drive unit of the present invention, can under the situation of not using sensor etc., carry out the positioning control of rotor accurately.

In the drive unit of the invention described above, preferably, the homing action of the origin position of above-mentioned operational part is following to carry out: read the above-mentioned on-position that is stored in the above-mentioned origin position storage part, and use the above-mentioned step motor of above-mentioned driver drives, advancing above-mentioned on-position so that the approaching above-mentioned restriction end of above-mentioned driven member, and moving of above-mentioned driven member by under the state of above-mentioned restriction end restriction, further on-position is advanced to and the above-mentioned corresponding position of above-mentioned on-position of reading, the value of above-mentioned absolute position that will be corresponding with this on-position resets.

In addition, preferably, the pattern of supplying with the exciting current of above-mentioned step motor has 0 to n n+1 kind, and n+1 is the even number more than 4; Along with the numbering of above-mentioned exciting current pattern enters n from 0, above-mentioned driven member is near above-mentioned restriction end, and the pattern numbering of the above-mentioned exciting current when the mobile restriction of above-mentioned driven member is begun is set at n; When each numbering with the numbering of above-mentioned on-position and above-mentioned exciting current pattern is set at 0 to n accordingly, the numbering of the above-mentioned on-position corresponding with above-mentioned origin position in (n+1)/2 to the scope of n-1.

In addition, preferably, also possess the side-play amount storage part, storage and the above-mentioned on-position from be stored in above-mentioned origin position storage part play the suitable skew amount of movement of amount of movement of the ad-hoc location that leaves predetermined distance; Above-mentioned operational part is controlled above-mentioned driver after the resetting of the origin position of above-mentioned driven member, above-mentioned driven member is moved be stored in the skew amount of movement in the above-mentioned side-play amount storage part.According to this structure, can shorten from energized to the time that becomes till the state that can use camera head.

In addition, preferably, above-mentioned driven member is the aperture portion of the light quantity of control object light.In addition, in the 4th kind of lens driver of the invention described above, preferably, above-mentioned driven member is the aperture portion that said lens keeps the light quantity of frame and control object light.

Below, with reference to the description of drawings one embodiment of the present invention.

(first embodiment)

Fig. 1 is the skeleton diagram and the block diagram of the lens driver of first embodiment of the invention.Among Fig. 1, the 1st, lens barrel, the 2nd, be fixed on the fixed lens on the lens barrel 1, the 3rd, zoom lens, zoom lens 3 are by making the periphery rotation of zoom ring 6 along lens barrel 1, mobile zoom lens on optical axis direction, thereby the lens of adjustment zoom ratio.Condenser lens 4 is by the rotation as the motor 9 of driving mechanism, moves on optical axis direction along cutting threaded screw, adjusts the lens of focus.

Motor 9 is step motor, in the example of Fig. 1, is rotated according to the phase place from the drive signal (excitation signal) of the motor coil of focus motor drive division 11 output.The 5th, as the imaging apparatus of picture pick-up device, be electric signal with transmission fixed lens 2, zoom lens 3 and condenser lens 4 image transformation of the subjects of shooting afterwards.The 7th, shading member is fixed on the frame of condenser lens 4.Shown in the dotted line of Fig. 1, by condenser lens 4 being moved on the direction of imaging apparatus 5, cover photoelectric sensor 8 as position-detection sensor with shading member 7, carry out the detection of the origin position (reference position) of condenser lens 4 thus.

The 10th, be used to detect the zoom ring position test section of the position of rotation of zoom ring 6.In position probing, use linear orientation sensor etc., the pulse that the resistance value of this linear orientation sensor produces according to the rotation corresponding to zoom ring 6 or change to the displacement that the optical axis direction of zoom lens 3 moves.The 12nd, the electric signal that basis is exported from imaging apparatus 5 generates view data or carries out the signal processing part of the contrast information of focus adjustment.

The 13rd, as the systems control division of lens position arithmetic element, driving command to focus motor control part 15 output condenser lenses 4, the image of being handled according to signal processing part 12 by the user focuses on adjustment, or according to the contrast information of signal processing part 12, the driving command line focusing of going forward side by side of output condenser lens 4 is adjusted (automatic focusing function) automatically, so that contrast becomes maximum.

Fig. 2 is the detailed diagram of focus motor control part 15 shown in Figure 1.In Fig. 2, focus motor control part 15 comprises on-position counter 151, tracing positional control part 152 and absolute position counter 153.On-position counter 151 is according to focusing moving direction and mobile step information from 152 outputs of tracing positional control part, and the count increments or the counting of on-position counter that is used to control the drive signal phase place of motor 9 successively decreases.

Tracing positional control part 152 is exported the focusing moving direction and the mobile step information that are used for carrying out according to the command information from systems control division 13 position control of condenser lens 4 according to from the zoom position information of zoom ring position test section 10 outputs and the focal position information of exporting from absolute position counter 153.

In said structure, by the rotation of motor 9, the position of control condenser lens 4.In addition, be used to the drive signal of self-focusing motor driving part 11, the rotation of control motor 9, described focus motor drive division 11 has been accepted the signal from focus motor control part 15.That is, formed the lens position control module by motor 9, focus motor drive division 11 and focus motor control part 15.

Be driven to the direction of imaging apparatus 5 at condenser lens 4, photoelectric sensor 8 crested members 7 cover, thereby the signal level variation of photoelectric sensor and under defined terms, surpass threshold value (perhaps, according to circuit structure than threshold value hour) time, the reset processing of absolute position counter 153 of systems control division 13.

In addition, be provided with the AD transducer that the signal from photoelectric sensor 8 outputs is carried out the Analog-digital conversion, in systems control division 13, the signal level of photoelectric sensor 8 handled as digital value at systems control division 13.For example, use 8 AD transducers of the input D scope (D range) of 3V.Under this situation, at the output level of photoelectric sensor when 0V is changed to 3V, can be with this output level as digital value with 0 to 255 value representation.

The count value synchronization action of absolute position counter 153 and on-position counter 151.On-position counter 151 be with the one-period of the driving electric angle of motor 9 (360 degree) as a counter back into the row counting, and absolute position counter 153 value that to be expressions be reset with rated condition is as the counter of the absolute position of benchmark.The 14th, nonvolatile memory can carry out writing and read operation of on-position counter 151.As the back explanation, nonvolatile memory 14 plays the effect as the reference position storage unit.

Below, with reference to Fig. 3, the action of the lens driver that as above constitutes is described.Fig. 3 is that the initial point of the operation of first embodiment when adjusting detects action specification figure." on-position " that Fig. 3 represents is corresponding with the phase place of drive signal, will carry out 8 from 1 cycles 360 degree that focus motor drive division 11 outputs to the motor coil drive signal of motor 9 and cut apart, and shows as 3 count values of on-position counter 151.At this, show along with condenser lens 4 to imaging apparatus 5 side shiftings, on-position subtracts 1 situation at every turn.

" A phase current " and " B phase current " is, to output to the current waveform of the motor coil of motor 9 from focus motor drive division 11, represents that motor 9 has the example of A phase and B two phase coils mutually.The electric angle of A phase current and B phase current (1 cycle of current waveform was made as 360 o'clock) has 90 degree phase differential, by A is applied electric current with B motor coil mutually mutually, makes motor 9 rotations.At this,, make condenser lens 4 to imaging apparatus 5 side shiftings with the condition of A phase current with respect to the leading 90 degree phase places of B phase current.

The count value of " absolute position counter " expression absolute position counter 153 with the on-position synchronization action, subtracts at 1 o'clock at on-position at every turn, and the absolute position counter subtracts 1 too at every turn.Wherein, the absolute position counter is set at bit wide and does not have identical value in the moving range of condenser lens 4.

" photoelectric sensor output level " expression: move, also use shading member 7 shield light electric transducers 8, the situation that output level is changed to the direction of imaging apparatus 5 by condenser lens 4.

Then, with reference to Fig. 3 and 4, the initial point that specifies the condenser lens 4 in operation is adjusted detects action.Fig. 4 is that the initial point of first embodiment of the present invention detects action flow chart, is illustrated in the motion flow that is programmed in the systems control division 13.When energized, handle from " initial point detects and adjusts ".

In step 101, the motor 9 as focus motor is moved to (imaging apparatus 5 directions) to the initial point detection side length by length.Under this situation, on-position counting 151 subtracts 1 at every turn.More specifically, according to instruction, carry out countdown by 152 pairs of on-position counters of tracing positional control part 151 from systems control division 13.In focus motor drive division 11,, condenser lens 4 is moved by making motor 9 along with of the direction rotation of this countdown to imaging apparatus 5.

In step 102, judge whether the photoelectric sensor output level has surpassed threshold value.Not surpassing under the situation of threshold value, return step 101, make 9 times 1 step actions of motor.Surpassing under the situation of threshold value, enter step 103, will be above on-position substitution P value constantly.At this, with on-position " 4 " substitution P.In step 104, store P into nonvolatile memory 14 as Po.In step 105, the absolute position counter is resetted.In Fig. 3, the position of representing with " 0 " becomes the position that is reset.

The initial point of the condenser lens 4 during then, with reference to Fig. 5 and 6 pairs of common uses detects action and carries out following explanation.Initial point when Fig. 5 is the common use of first embodiment detects action specification figure.Initial point when Fig. 6 is the common use of first embodiment detects action flow chart, and expression is programmed in the motion flow in the systems control division 13.In addition, for the on-position of representing among Fig. 5, A phase current, B phase current, absolute position counter and photoelectric sensor output level, since same with the explanation among Fig. 3, the therefore explanation of omitting repeating part.

In Fig. 6, when energized, handle from " initial point detection ".In step 201, read Po from nonvolatile memory 14.In step 202,, Pd is carried out computing according to following formula (1).

Formula 1:

Pd=Po-(1 cycle of on-position)/2

At this, 1 cycle of on-position is " 8 ".In addition, the initial point of the condenser lens 4 when above-mentioned operation is adjusted detects in the action, and the value of storage is " 4 " in the nonvolatile memory 14.Therefore, become Pd=4-8/2=0 in this embodiment.

In step 203, judge whether Pd is negative value, Pd be 0 or on the occasion of the time, just directly enter next step 204.When Pd is negative value, in step 203a, afterwards, enter next step 204 at calculating Pd=Pd+ (1 cycle of on-position).When Pd is negative value, though the data of this on-position not by the computing of step 203a, can be obtained the on-position Pd of skew semiperiod from Po.

In step 204, make motor 9 move (making the each minimizing 1 of on-position counter) to (direction of imaging apparatus 5) to the initial point detection side length by length.More specifically, according to instruction,, make on-position counter 151 carry out countdown by tracing positional control part 152 from systems control division 13.In focus motor drive division 11,, condenser lens 4 is moved by making motor 9 along with of the direction rotation of this countdown to imaging apparatus 5.

In step 205, judge whether current on-position is identical with Pd (being Pd=0 in this embodiment).If inequality, then return step 204, make 9 times 1 step actions of motor.If identical, then enter next step 206.In the example of Fig. 5,, be that on-position is identical with Pd (Pd=0) judging (n-2), judge (n-1), judging the position that (n) indicates.In step 206, judge whether surpassed threshold value at these each photoelectric sensor for position output levels.

At first, judge whether the photoelectric sensor output level has surpassed threshold value in the position of judging (n-2).In the example of Fig. 5,,, make 9 times 1 step actions of motor so return step 204 owing to do not surpass threshold value.When becoming the position of judgement (n-1), judge once more whether the photoelectric sensor output level has surpassed threshold value when repeating the action of 1 step.In the example of Fig. 5,,, make focus motor descend the action of 1 step so return step 204 owing to do not surpass threshold value.When becoming the position of judgement (n), judge inferior whether the photoelectric sensor output level has surpassed threshold value when repeating the action of 1 step.In the example of Fig. 5, surpassed threshold value.At this moment, enter step 207, absolute position counter 1 53 is predisposed to-(1 cycle of on-position)/2.At this, because (1 cycle of on-position)=8, so be predisposed to-4 (numerical value of usefulness zero encirclement of absolute position counter as shown in Figure 5).

At this, the level under the mechanism of the photoelectric sensor output level of representing with P2 among Fig. 5 identical environment for use temperature and humidity when being illustrated in and adjusting with operation and the condition of electrical characteristics changes.But represented as P1 or P3 when the common use that repeats power connection, at each on-position of motor 9, the photoelectric sensor output level produces deviation in the position that changes from P2.This be because, the gap, environment for use temperature of the lens unit driving direction of this moment and humidity change that the mechanism that causes and electrical characteristics deviation equal error cause.

In the present embodiment, as mentioned above, the initial point when usually using detects action and carries out in judgement shown in Figure 5 (n-2), judges (n-1), judges whether photoelectric sensor output level in (n) has surpassed the judgement of threshold value.Thus, even produced in the scope of P1 to P3 under the situation of deviation, absolute value counter 153 also must be predisposed to " 4 ", when the absolute position counter is " 0 ", the on-position of motor 9 must become " 4 ", the origin position in the time of can reproducing the operation adjustment.

More specifically, above-mentioned each on-position of judging is the position of Pd (Pd=0).Because Pd is the value that calculates with above-mentioned formula (1), so be the position that has been offset the semiperiod from origin position Po (position of on-position " 4 ").Therefore, from the Pd position to the next Pd position, that is, judge that to next on-position changed for 1 cycle, must pass through the position of on-position " 4 " position from judging the position.

Judge the position that on-position " 4 " are arranged between position and next the judgement position at certain, still, if all super only threshold value of each photoelectric sensor output level, then this on-position " 4 " is not an origin position.On the other hand, if certain judges that the photoelectric sensor output level in the position is no more than threshold value, and next judges that the level of the photoelectric sensor output of position surpasses threshold value, then judges that the on-position " 4 " between the position is an origin position for these two.

As previously mentioned, judge that the on-position in the position is from the origin position position of skew semiperiod, so be predisposed to " 4 " as if the absolute value counter 153 that the photoelectric sensor output level is surpassed the judgement position of threshold value, then the absolute position counter be " 0 " and the position, the origin position when becoming operation and adjusting.

When the photoelectric sensor output level has deviation shown in the P1 of Fig. 5 or P3, the position beyond origin position, the photoelectric sensor output level surpasses threshold value.Therefore, even will be origin position above the position judgment of threshold value, this position neither origin position.Present embodiment does not need directly to detect origin position, certain photoelectric sensor output level of judging the position is no more than threshold value and next judges that the photoelectric sensor output level of position surpasses the situation of threshold value, just can correctly detect origin position as long as can detect.

But the mechanism that the gap of lens unit driving direction, environment for use temperature and humidity variation cause and the amplitude of electrical specification deviation equal error must be suppressed in the on-position scope in 1 cycle.

Have, the example of above-mentioned steps 202 is the examples that deduct (1 cycle of on-position)/2 shown in above-mentioned formula (1) from Po again, still, shown in (2), also can be to add (1 cycle of on-position)/2.

Formula (2):

Pd=Po+ (1 cycle of on-position)/2

Under this situation, if in step 203 1 cycle of Pd 〉=on-position, then at step 203a, calculate Pd with following formula (3).Thus, can obtain the on-position Pd of skew semiperiod from Po.

Formula (3):

Pd=Pd-(1 cycle of on-position)

For example, in the present embodiment, Po=4,1 cycle of on-position is 8, so the value of above-mentioned formula (2) becomes 4+4=8, this value satisfies 1 cycle of Pd 〉=on-position.Therefore,, become 8-8=0, obtain result identical when using formula (1) when utilizing formula (3) when obtaining Pd.As implied above, it is identical to replace formula (1) to use in situation each embodiment below of formula (2).

Fig. 7 is the chart of the relation between expression zoom position and the focal position.When L1 represents will the distance from the fixed lens front surface to subject for example to be made as 2m, the zoom ring position that carries out the zoom action under the state of focusing state and the relation between the focal position can kept.When L2 is illustrated in the distance from the fixed lens front surface to subject for example is made as 1m, between zoom ring position that can carry out the zoom action under the state of having kept focusing state and focal position, concern.

The zoom position T of transverse axis represents the side of looking in the distance, and W represents the wide-angle side.The initial point that do not have in focus detects under the perfect condition of deviation, if fixed lens front surface to the distance of subject is made as 1m, then determined under the situation of focal position (A point among the figure) in the T side, when zoom position is moved to the W side, keep focusing state along the curve of L2 on one side, Yi Bian the action of focusing.

But, fixed lens front surface to the distance of subject is being made as 2m and is determining in the T side under the situation of focal position, when the influence of hypothesis owing to initial point detection position deviation delta X, fixed lens front surface under focal position and the perfect condition to the distance of subject is that the point (the A point among the figure) of the T side of 1m is consistent the time, with zoom position during to the W side shifting, the L10 curve that has been offset Δ X with respect to L1 according to the focal position action of focusing.Therefore, produce the focal position skew in the W side.In the present invention, can not produce such situation, the initial point that mechanism that can realize not being subjected to gap, environment for use temperature and the humidity of the driving direction of condenser lens unit to change causing and electrical characteristics deviation equal error influence detects action, therefore, can improve the precision of the absolute position of condenser lens unit largely, while the present invention especially focuses in the system of action effectively keeping focusing state.

(second embodiment)

Below second embodiment of the present invention is described.To detect action also identical in second embodiment for Shuo Ming Fig. 1, structure shown in Figure 2 and the initial point when adjusting with the operations of Fig. 3,4 explanations in the first embodiment.

With reference to Fig. 8,9, the initial point of the condenser lens 4 during to the common use in second embodiment detects action and describes.Initial point when Fig. 8 is the common use of second embodiment detects action specification figure.Have, the on-position that Fig. 8 represents, A phase current, B phase current, absolute position counter and photoelectric sensor output level are identical with explanation among Fig. 3, the therefore explanation of omitting repeating part again.

In second embodiment, different with first embodiment, along with condenser lens 4 to the moving of imaging apparatus 5 sides, on-position subtracts 2 at every turn.Therefore, the count value with the absolute position counter 153 of on-position synchronization action also subtracts 2 at every turn.Wherein, the absolute position counter is set bit wide for and do not have identical value in the moving range of condenser lens 4.

In the first embodiment, the time in 1 cycle of drive signal be time T when operation is adjusted and when usually using, but in second embodiment, the time in 1 cycle of drive signal when using usually is illustrated in figure 8 as T/2 shown in Fig. 3,5.Thereby in second embodiment, the initial point in the time of can using usually with 2 times speed of first embodiment detects action.

Initial point when Fig. 9 is the common use of second embodiment detects action flow chart, and expression is programmed in the motion flow in the systems control division 13.When energized, handle from " initial point detection ".In step 302, read Po from nonvolatile memory 13.In step 301, calculating above-mentioned formula (1) is Pd=Po-(1 cycle of on-position)/2.At this, on-position 1 cycle=8.In second embodiment, also explanation is stored in the example of the value identical with first embodiment " 4 " in the nonvolatile memory 14.

Therefore, in the present embodiment, Pd=4-8/2=0.In step 303, judge whether Pd is negative value, Pd be 0 or on the occasion of situation under, directly enter next step 304.In the Pd value is under the situation of negative value, in step 303a, calculates Pd=Pd+ (1 cycle of on-position) and afterwards, enters next step 304.At Pd is under the situation of negative value, through the reason of step 303a, identical with the reason of the step 203a that passes through Fig. 6 in the first embodiment.

In step 304, make motor 9 move for 2 steps (establish and rotate S=2 at interval, the on-position counter is subtracted 2 at every turn) to (direction of imaging apparatus 5) the initial point detection side at every turn.Wherein, on-position is set at comprises the Pd that before obtained (being Pd=0) at this.

More specifically, according to instruction, come on-position counter 151 is carried out countdown by tracing positional control part 152 from systems control division 13.In focus motor drive division 11,, the direction of condenser lens 4 to imaging apparatus 5 moved by making motor 9 along with this countdown is rotated.

In step 305, judge whether current on-position is identical with Pd (Pd=0 in this example).If different, then return step 304, make focus motor carry out the next one 2 step action.If identical, the judgement that then enters next step 306.

Judge that the position is with judgement shown in Figure 8 (n-3), judges (n-2), judges (n-1), judges the position that (n) represents, judges in step 306 whether the photoelectric sensor output level has surpassed threshold value.When not surpassing threshold value, return step 304, make focus motor carry out the next one 2 step action.When surpassing threshold value, enter step 307, and absolute position counter 153 is predisposed to-(1 cycle of on-position)/2 in the moment that surpasses.At this, be predisposed to " 4 " (numerical value that the usefulness zero of absolute position counter shown in Figure 8 is surrounded) according to (1 cycle of on-position)=8.

The photoelectric sensor output level produces in the scope of P1 to P3 under the situation of deviation, the origin position in the time of can reproducing operation reliably and adjust, and this part and first embodiment are same.In addition, in second embodiment, the initial point in the time of can using usually with the twice speed of first embodiment detects action.

Have, the error span of mechanism that the gap of lens unit driving direction, environment for use temperature and humidity variation cause and electrical characteristics deviation etc. need be suppressed in the on-position scope in 1 cycle again, and this is identical with first embodiment.

(the 3rd embodiment)

Below, the 3rd embodiment of the present invention is described.For with Fig. 1, structure repeating part shown in Figure 2 of explanation in the first embodiment, omit explanation.In the 3rd embodiment, illustrate that focus motor drive division 11 is rotated the example of driving to CD-ROM drive motor 9 by sine wave drive roughly (being also referred to as micro-stepping advances to drive).In addition, on-position counter 151 among Fig. 2 is 5 digit counters that 1 cycle of driving electric angle of motor 9 (360 degree) is represented with count value 32, absolute position counter 153 moves synchronously with the count value of on-position counter 151, presets or resets with rated condition described later.

Below, with reference to Figure 10 its action is described.Figure 10 is that the initial point of the operation of the 3rd embodiment when adjusting detects action specification figure.Represented " on-position " of Figure 10 is corresponding with the phase place of drive signal, will carry out 32 from 1 cycle 360 that focus motor drive division 11 outputs to the motor coil drive signal of motor 9 and cut apart, and shows with 5 count values of on-position counter 151.

At this, show along with condenser lens 4 to imaging apparatus 5 side shiftings, on-position subtracts 1 appearance at every turn." A phase current " and " B phase current " is the roughly sinusoidal waveform current waveform that outputs to the motor coil on the motor 9 from focus motor drive division 11, shows the example that motor 9 has A phase and B diphase winding mutually.The electric angle of A phase current and B phase current (1 cycle of current waveform is made as 360 when spending) has 90 degree phase differential mutually, by applying electric current mutually and on the B motor coil mutually at A, motor 9 is rotated.At this,, make condenser lens 4 to imaging apparatus 5 side shiftings with the condition of A phase current than the leading 90 degree phase places of B phase current.

Have, the structure of focus motor drive division 11 is again, uses the ROM table etc. of the relation of the count value that preestablished on-position counter 151 and driving current value, exports roughly sine-shaped current waveform.The count value of " absolute position counter " expression absolute position counter 153 is synchronously moved with on-position.Subtract at 1 o'clock at on-position, the absolute position counter subtracts 1 equally at every turn at every turn.Wherein, the absolute position counter is set at bit wide and does not have identical value in the moving range of condenser lens 4.

" photoelectric sensor output level " expression is moved and is utilized shading member 7 shield light electric transducers 8, the state that output level is changed to the direction of imaging apparatus 5 by condenser lens 4.

Then, specify the initial point detection action of the condenser lens 4 in the operation adjustment with reference to Fig. 4, Figure 10.Fig. 4 is that the initial point of first embodiment detects action flow chart, and process flow diagram is originally also general in the 3rd embodiment.But therefore the different part that imposes a condition in each step is that the center describes with the part that is different from first embodiment.

When energized, handle from " initial point detects and adjusts beginning ".In step 101, will move to (direction of imaging apparatus 5) to the initial point detection side length by length as the motor 9 of focus motor.In step 102, judge whether the photoelectric sensor output level surpasses, and under situation about not surpassing, returns step 101, make motor 9 carry out the next one 1 step action.Under situation about surpassing, enter step 103, will be above on-position substitution P constantly.At this, with on-position " 17 " substitution P.In step 104, store P into nonvolatile memory 14 as Po.In step 105, make the absolute position counter reset.In Figure 10, the position of representing with " 0 " becomes the position that is reset.

Then, with reference to Fig. 9,11, the initial point of the condenser lens 4 when following explanation is used usually detects action.Initial point when Figure 11 is the common use of the 3rd embodiment detects action specification figure.Fig. 9 is that the initial point of second embodiment detects action flow chart, and flow process is originally also general in this 3rd embodiment.But therefore the different part that imposes a condition in each step is that the center describes with the part that is different from first embodiment, second embodiment below.

In Fig. 9, when energized, handle from " initial point detection ".In step 301, read Po from nonvolatile memory 14.In step 302, calculating above-mentioned formula (1) is Pd=Po-(1 cycle of on-position)/2.At this, 1 cycle of on-position is " 32 ".In addition, the initial point of the condenser lens 4 when above-mentioned operation is adjusted detects in the action, and the value that is stored in the nonvolatile memory 14 is " 17 ".Therefore, in this embodiment, pd=17-32/2=1.

In step 303, judge whether Pd is negative value, Pd be 0 or on the occasion of situation under, directly enter step 304.At Pd is under the situation of negative value, in step 303a, afterwards, enters next step 304 at calculating Pd=Pd+ (1 cycle of on-position).At Pd is under the situation of negative value, though there is not the numerical value of corresponding on-position, by the calculating of step 303a, can obtain the on-position Pd of skew semiperiod from Po.

In step 304, motor 9 was moved for 8 steps (establish rotation S=8 at interval, the on-position technology is subtracted 8 at every turn) to the initial point detection side at every turn to (direction of imaging apparatus 5).Therefore, the speed that normally used initial point detects action becomes operation when adjusting 8 times, the drive cycle T when adjusting with respect to operation, the drive cycle when using usually becomes T/8.In addition, same with above-mentioned second embodiment, on-position is set at comprises the Pd (at this Pd=1) that had before obtained.In step 305, judge whether current on-position is identical with Pd (Pd=1 in this embodiment).If inequality, then return step 304, make motor 9 carry out the next one 16 step action.If identical, then enter next step 306.In the example of Figure 11, judging (n-3), judging (n-2), judging (n-1), judging the position that (n) indicates that on-position is identical with Pd (Pd=1).In step 306,, judge whether the photoelectric sensor output level has surpassed threshold value in these each positions.At first, in the position of judging (n-3), judge whether the photoelectric sensor output level surpasses threshold value.In the example of Figure 11, owing to do not surpass threshold value,, make motor 9 carry out the next one 16 step action so return step 304, repeat the action of 16 steps, when becoming the position of judgement (n-2), judge once more whether the photoelectric sensor output level has surpassed threshold value.In the example of Figure 11,,, make focus motor carry out the next one 16 step action so return step 304 owing to do not surpass threshold value.When becoming the position of judgements (n), judge that once more whether the photoelectric sensor output level is above threshold value when 16 step actions repeatedly.

In the example of Figure 11, surpassed threshold value.In this case, enter step 307, absolute position counter 153 is predisposed to-(1 cycle of on-position)/2.At this, because (1 cycle of on-position)=32, so be predisposed to " 16 " (numerical value of usefulness zero encirclement of absolute position counter as shown in Figure 1).

At this, the photoelectric sensor output level of representing with P20 among Figure 11 is illustrated in mechanism and the level under the electrical characteristics condition that environment for use temperature identical when adjusting with operation and humidity causes and changes.But, when repeating the common use of power connection sometimes,,, produce deviation from the position that P20 changes at the photoelectric sensor output level at each on-position of motor 9 as represented with P10 or P30.This is because mechanism and electrical characteristics deviation equal error that the gap of lens unit driving direction, environment for use temperature and humidity variation cause cause.

In the present embodiment, as previously shown, the initial point when using usually detects action in judgement shown in Figure 11 (n-3), judgement (n-2), judgement (n-1), judgement (n), judges whether the photoelectric sensor output level surpasses threshold value.Thus, taking place under the situation of deviation in the scope of P10 to P30, absolute value counter 153 necessarily is predisposed to " 16 ", when the absolute position counter is " 0 ", the on-position of motor 9 necessarily becomes " 17 ", the origin position in the time of can reproducing the operation adjustment.

Even the photoelectric sensor output level has produced in the scope of P10 to P30 under the situation of deviation, the origin position in the time of also can reproducing the operation adjustment reliably, this point is identical with first embodiment.

Beyond this, in the 3rd embodiment, motor is rotated driving, thereby can makes the number of cutting apart of 1 cycles 360 degree when setting count value become big by sine wave drive roughly, can strengthen the figure place of counter.

Therefore, compare with first embodiment, origin position when the operation that detects condenser lens is accurately adjusted, and, even the initial point when similarly using usually with high speed with second embodiment detects action, the origin position in the time of also can reproducing the operation adjustment of arriving reliably with high Precision Detection.In addition, because the central value of the deviation that produces when operation is adjusted, can correctly obtain common use the time, so can guarantee design margin to deviation.

Have, the amplitude of the mechanism of the gap of lens unit driving direction, environment for use temperature and humidity and electrical characteristics deviation equal error need be suppressed in the on-position scope in 1 cycle again, and this is identical with first embodiment and second embodiment.

At this, if the cycle of the drive signal of the CD-ROM drive motor will when operation is adjusted, obtain the reference position time be set at T, the period T of the drive signal of the motor when obtaining the reference position once more when then using usually ' with following formula (4) expression.

Formula (4):

T’＝(M/N)·T

In formula (4), N=2n (n is the integer more than 2), M is for satisfying the integer of 2n＞M＞2.

In the 3rd embodiment, illustrated that the initial point when adjusting with respect to operation detects the cycle of the motor driven waveform in the action, the cycle that initial point when using usually detects the motor driven waveform in the action be made as 1/8 (, M=1, N=8), but, the cycle of also can the initial point when using usually detecting the motor driven waveform in the action is set at 3/32 (, M=3, N=32).Particularly, in Figure 20, it is also passable that on-position is advanced by 1 → 22 → 11 → 1, replaces on-position to advance by 1 → 25 → 17 → 9 → 1.

In addition, in the 3rd embodiment, illustrated that motor driven is sine wave drive roughly, but also gone for utilizing PWM to carry out the roughly type of drive of sine wave drive.

(the 4th embodiment)

Below, the 4th embodiment of the present invention is described.To detect action also identical in the 4th embodiment for Shuo Ming Fig. 1, structure shown in Figure 2 and the initial point when utilizing the operations of Fig. 3,4 explanations to adjust in the first embodiment.

With reference to Figure 12,13, the initial point of the condenser lens 4 when the common use in the 4th embodiment is described detects action.Initial point when Figure 12 is the common use of the 4th embodiment detects action specification figure.Have, the on-position that Figure 12 represents, A phase current, B phase current, absolute position counter and photoelectric sensor output level are identical with content illustrated in fig. 3 again, therefore the explanation of omitting repeating part.

Figure 13 is the process flow diagram that the power-off of the 4th embodiment is handled, and expression is programmed in the motion flow in the systems control division 13.In the figure, the power supply that is illustrated in camera head main bodys such as still image camera, video camera when being closed, carries out the example to the transfer processing of power-off by main body switch (not shown).

When power supply was closed, systems control division 13 was handled from " power-off processing ".In step 401, make motor 9 move for 2 steps (the on-position counter is subtracted 2 at every turn) to (direction of imaging apparatus 5) to the initial point detection side at every turn.Wherein, on-position is set at comprises the Pd that illustrates in second embodiment (being Pd=0) at this.More specifically, according to instruction, carry out countdown by 152 pairs of on-position counters of tracing positional control part 151 from systems control division 13.In focus motor drive division 11,, condenser lens 4 is moved to the direction of imaging apparatus 5 along with this countdown makes motor 9 rotations.

In step 402, when inconsistent, turn back to step 401 in the count value of absolute position counter 153 and on-position 1 cycle/2, make focus motor carry out the next one 2 step action.When unanimity, handle and enter into step 403, close the power supply of main body.At this, because on-position 1 cycle=8, therefore, in absolute position count value=4 o'clock, the power supply of main body is closed (with reference to Figure 12).

Then, the action when utilizing Fig. 9 to illustrate that power supply is switched on by the main body switch in second embodiment, when energized, handle according to process flow diagram from " initial point detection ".Because explanation midway repeats, therefore omit, but in the step 306 of Fig. 9, judge whether the photoelectric sensor output level surpasses threshold value, the count value of absolute position counter 153 is predisposed to " 4 " (numerical value of usefulness zero encirclement of absolute position counter as shown in figure 12).

As shown in figure 12, in the power-off transfer processing, (the photoelectric sensor output level surpasses the tight front of threshold value) stops focus motor in the tight front of origin position.Therefore, in the 4th embodiment, the judgement of the photoelectric sensor output level during the initial point during energized detects is with initial once just finishing.More specifically, be origin position because the count value of absolute position counter becomes the position of " 0 ", therefore, the stop position consistent with on-position 1 cycle/2 in count value be, clips the judgement position of the side of going ahead of the rest in the judgement position of origin position.That is, in the present embodiment, having such feature, promptly in the position that the power-off transfer processing stops focus motor, is the judgement position of carrying out when energized next time before 1 of position of final judgement of photoelectric sensor output level.

By as above carrying out the power-off transfer processing, gap, environment for use temperature and the humidity that has produced the lens unit driving direction in during before power connection next time changes under the situation of the mechanism that causes and electrical characteristics deviation equal error, also can carry out initial point reliably and detect only by the judgement of initial photoelectric sensor output level once.

Have again, the error span that the gap of lens unit driving direction, environment for use temperature and humidity change the mechanism that causes and electrical characteristics deviation etc. need be suppressed in the on-position scope in 1 cycle, and this is identical with first embodiment, second embodiment, the 3rd embodiment.

(the 5th embodiment)

Below, the 5th embodiment of the present invention is described.Shuo Ming Fig. 1, structure shown in Figure 2 are also identical in the 5th embodiment in the first embodiment.Below, the initial point of the condenser lens 4 when adjusting with reference to the operation in Figure 14,15 explanations the 5th embodiment detects action.

Figure 14 is that the initial point of the operation of the 5th embodiment when adjusting detects action specification figure.For the represented on-position of Figure 14, A phase current, B phase current, absolute position counter and photoelectric sensor output level, identical with the explanation among Fig. 3 of first embodiment, the therefore explanation of omitting repeating part.In addition, along with condenser lens 4 to imaging apparatus 5 side shiftings, on-position subtracts 1 situation at every turn, and is also identical with first embodiment.

Figure 15 is that the initial point of the operation of the 5th embodiment when adjusting detects action flow chart, and expression is programmed in the motion flow in the systems control division 13.When energized, handle from " initial point detects and adjusts beginning ".In step 501, for example adjust the upward demonstration " main body up " of liquid crystal display picture (not shown) of menu in operation.The lens 2 that make camera head enter next step 502 towards the top.

In step 502, make motor 9 move for 1 step (making the on-position counter at every turn subtract 1) to (direction of imaging apparatus 5) to the initial point detection side at every turn.More specifically, according to instruction, make on-position counter 151 carry out countdown by tracing positional control part 152 from systems control division 13.In focus motor drive division 11,, condenser lens 4 is moved to the direction of imaging apparatus 5 by making motor 9 along with this countdown is rotated.

In step 503, judge whether the photoelectric sensor output level has surpassed threshold value.When being no more than threshold value, return step 502, make motor 9 carry out the next one 1 step action.When surpassing threshold value, enter step 504, will be above on-position substitution Pu constantly.At this, with on-position " 6 " substitution Pu.

In next procedure 505, for example the liquid crystal panel at operation adjustment menu shows demonstration " main body down " in (not shown).The lens 2 that make camera head enter next step 506 down.In step 506, make motor 9 move for 1 step (the on-position counter is subtracted 1 at every turn) to (direction of imaging apparatus 5) to the initial point detection side at every turn.

In step 507, judge whether the photoelectric sensor output level has surpassed threshold value.Not surpassing under the situation of threshold value, return step 506, make motor 9 carry out the next one 1 step action.Surpassing under the situation of threshold value, enter step 508, will be above on-position substitution Pd constantly.

At this, with on-position " 2 " substitution Pd.In step 509, judge the size of Pd and Pu.At this, because Pu=6, therefore Pd=2 enters next procedure 510.In step 510, calculate P=INT ((Pu+Pd)/2), and obtain P=4.Have, INT represents to give up below the radix point again.In step 5 11, judge that P is whether little than 0, at this, because P=4 enters next step 512, stores P=4 in the nonvolatile memory into as Po.

In step 513, the count value of absolute position counter 153 is predisposed to-INT ((Pu+Pd)/2).The value of-INT ((Pu+Pd)/2) becomes-INT ((6-2)/2)=-2.Calculate by this, what leave between the origin position of origin position in the time of can calculating on-position and the centre up the time and down the time down.As shown in figure 14, if the numerical value of the absolute position counter of the origin position in the time of will be down is made as-2 (with zero numerical value that surrounds) of calculated value, then the count value of the absolute position counter 153 of the origin position (on-position " 4 ") of the centre up the time and down the time becomes " 0 ".

Have again, in Figure 14, in Figure 14 from " state up " when " state down " changes posture, the photoelectric sensor output level produces jump, its reason is, condenser lens 4 because of deadweight and deviation (for example being used for the gap between the tooth bar of the screw of mobile motor 9 and condenser lens 4) to from imaging apparatus 5 away from direction move.

In above-mentioned example, with the initial point detection position Pu=6 under the state up, the initial point detection position Pd=2 under the state is that the example of Pd＜Pu is illustrated down.In this case, as previously mentioned, can obtain centre position P by the calculating formula of step 510.But, under the situation of Pd＞Pu, in the calculating formula of step 510, can not obtain centre position P.For example, under the situation of Pu=0, Pd=4, though centre position P can also can find out to be 6 like that from the diagram of the on-position of Figure 14, if with the calculating formula computing of step 510, just become P=INT ((0+4)/2)=2, become the value different with P=6.

Under these circumstances, by step 509a, 511a, can calculate correct centre position P.In the example of above-mentioned Pu=0, Pd=4, because therefore Pd＞Pu transfers to step 509a, calculate Pd=Pd-(1 cycle of on-position), because Pd=-4 is obtained in on-position 1 cycle=8.Value when using this Pd when obtaining P by the calculating formula of step 5 10, becomes P=INT ((0-4)/2)=-2.At this moment, in step 511,, calculate P=P+ (1 cycle of on-position), obtain P=6 because step 511 is transferred in P＜0 therefore.At P is under the situation of negative value, through the reason of step 511a, identical with the reason of the step 203a that passes through Fig. 6 in the first embodiment.

In this embodiment, in step 512, store P=6 into step volatile storage 14 as Po.Then, in step 513, if the Pd=-4 that uses Pu=0, calculates at step 509a, then-INT ((Pu+Pd)/2)=-2, the count value of the part corresponding with the origin position down (Pd=4) of absolute position counter 153 is predisposed to " 2 ".

As mentioned above, in the 5th embodiment, the origin position of storage becomes at state up and distinguishes the centre position of detected origin position down under the state in the nonvolatile memory 14, as illustrating in the first embodiment, do not consider in the initial point adjustment of posture difference, with when adjusting, for example produce the poor and situation that when using usually, produced posture difference down of up posture and compare, in the 5th embodiment, the lens position error that the posture difference can be caused is improved as 1/2.

In addition, in the 5th embodiment, illustrated that at first carry out initial point under the state detects up, then carry out the example that initial point detects under the state down, but, if considering under the situation of deviation that up a side of state compares further from origin position than state down, then the initial point of state detects as long as at first carry out down, and carry out the initial point detection afterwards under the state up just passable.

In addition, in the camera head that the deviation of the initial point detection position that the posture difference causes is prescribed with specification (spec), the state or carry out initial point under a certain state in the state down and detect up will can obtain same effect from half position of detected offset specification as initial point.

In addition, present embodiment is, cause at the initial point detecting position with the posture difference of lens barrel and to be equipped with the example of deviation for its prerequisite, but, as long as the precision of lens barrel can be guaranteed degree, then also can be the structure of above-mentioned first to fourth embodiment in the deviation of the initial point detection position that causes less than posture difference because of lens barrel.

(the 6th embodiment)

Below, the 6th embodiment of the present invention is described.Figure 16 is the skeleton diagram and the block diagram of the lens driver of the 6th embodiment.In Figure 16, the identical mark of mark omits its detailed description on the structure identical with Fig. 1.Lens driver shown in Figure 16 is also to possess temperature sensor 16, angular transducer 17 on the lens driver of Fig. 1.

Temperature sensor 16 is located in the lens barrel 1 or in the camera head main body (not shown), is the sensor of detected temperatures, uses thermistor etc.Angular transducer 17 is located in the lens barrel 1 or in the camera head main body (not shown), is the sensor that detects the inclination of lens barrel or camera head main body.

Figure 17 illustrates an example of the angular detection of angular transducer 17.In the example of Figure 17, the output voltage from angular transducer 17 outputs during with lens barrel 1 or camera head main body level is made as 0, and output voltage changes according to the posture angle.

Have, angular transducer 17 also can be that the inclination of detection lens barrel 1 or camera head main body is the inclination sensor that reaches 3 positions of level up, down again.In addition, the structure of the focus motor control part 15 of present embodiment is identical with the structure shown in Figure 2 of above-mentioned first embodiment.

Below, the initial point of the condenser lens 4 when with reference to Figure 18,19 the common use of the 6th embodiment being described detects action.Initial point when Figure 18 is the common use of the 6th embodiment detects action specification figure.When Figure 18 (a) has supposed that temperature is higher than normal temperature and lens 2 state up of lens barrel 1, when Figure 18 (b) has supposed that temperature is lower than normal temperature and lens 2 state down of lens barrel 1.

On-position, A phase current, B phase current, absolute position counter and the photoelectric sensor output level represented at Figure 18, identical with the explanation among Fig. 3 of first embodiment, the therefore explanation of omitting repeating part.In addition, along with condenser lens 4 to imaging apparatus 5 side shiftings, on-position subtracts 2 at every turn, this example with Fig. 8 of second embodiment is identical.

Initial point when Figure 19 is the common use of the 6th embodiment detects action flow chart, and expression is programmed in the motion flow in the systems control division 13.When energized, handle from " initial point detection ".In step 601, read Po from nonvolatile memory 14.In step 602, calculate Pd=Po-(1 cycle of on-position)/2.At this, on-position 1 cycle=8.In addition, the initial point of the condenser lens 4 when operation is adjusted detects in the action, and is same with first embodiment, and the value that is stored in the nonvolatile memory 14 is " 4 ".Therefore, become Pd=4-8/2=0.

In step 602b, the output information according to from temperature sensor 16 and angular transducer 17 adds correction value delta Pd on Pd.Under lens 2 situation up with lens barrel 1, the direction of more close imaging apparatus 5 moves condenser lens 4 to than horizontal positioned the time because of deadweight and gap (for example the screw of motor 9 and be used for gap between the tooth bar of mobile focusing lens 4).Moreover, when temperature is higher than normal temperature and the thermal expansivity of shading member 7 than under the big situation of lens barrel 1 and motor 9, shading member 7 is positioned at the position near photoelectric sensor 8.

Therefore, shown in the photoelectric sensor output level P4 of Figure 18 (a), during with normal temperature and the photoelectric sensor output level P2 during horizontal positioned compare, the moment that the photoelectric sensor output level changes when initial point detects is ahead of time.At this, show such example, that is, the error that the error that will produce because of rising from the temperature of normal temperature produces during towards upside from horizontal positioned as 1 step and with camera head at the on-position of motor 9, produces and amounts to 2 and go on foot errors as 1 step at the on-position of motor 9.

Therefore, Δ Pd=2, thus calculate Pd2=2 at step 602b.Judge in step 603 whether Pd2 is negative value, Pd2 be 0 or on the occasion of situation under, directly enter next step 604.In the Pd value is under the situation of negative value, in step 603a, calculates Pd=Pd+ (1 cycle of on-position) and afterwards, enters next step 604.At Pd is under the situation of negative value, through the reason of step 603a, identical with the reason of the step 203a that passes through Fig. 6 in the first embodiment.

In step 604, make motor 9 move for 2 steps (the on-position counter is subtracted 2 at every turn) to (direction of imaging apparatus 5) to the initial point detection side at every turn.Wherein, on-position is set at comprises the Pd2 that before obtained (being Pd2=2) at this.More specifically, according to instruction, come on-position counter 151 is carried out countdown by tracing positional control part 152 from systems control division 13.In focus motor drive division 11, motor 9 is rotated along with this countdown, thereby condenser lens 4 is moved to the direction of imaging apparatus 5.

In step 605, judge whether current on-position is identical with Pd2 (Pd2=2 in this example).If different, then return step 602b, make motor 9 carry out the next one 2 step action.If identical, the judgement that then enters next step 606.

The position of Pd2=2 is with the judgement (n-2) shown in Figure 18 (a), judges (n-1), judges the position that (n) represents.Therefore these judge that respectively the position is positioned at on-position and becomes 2 position, are than the positions (from the position that imaging apparatus 5 far goes) in 2 steps in advance, the position of the on-position before the corrected value that adds 0.Therefore, respectively judge the judgement of position at these, during with the position probing normal temperature that at on-position is 0 and the situation of the photoelectric sensor output level P2 during horizontal positioned identical in fact.

In step 606,, judge whether the photoelectric sensor output level has surpassed threshold value in above-mentioned judgement position.When not surpassing threshold value, return step 602b, make focus motor carry out the next one 2 step action.Surpassing under the situation of threshold value, enter step 607, and absolute position counter 153 is being predisposed to-(1 cycle of on-position)/2+ Δ Pd above the moment.At this, owing to (1 cycle of on-position)=8, Δ Pd=2, so be predisposed to " 2 " (numerical value that the usefulness zero of the absolute position counter shown in Figure 18 (a) is surrounded).

Have again, in the explanation of Fig. 9 of second embodiment, show, when not satisfying condition, return the example of step 304, but in the 6th embodiment, show the example that returns step 602b in step 305 or step 306.This is because in the 6th embodiment, when in the initial point detection action temperature variation or posture difference having taken place, change one by one and judge whether the photoelectric sensor output level surpasses the judgement position of threshold value.

Below, with reference to Figure 18 (b), Figure 19 illustrate make lens barrel 1 lens 2 down and the temperature situation low than normal temperature.Under lens 2 situation down that makes lens barrel 1, condenser lens 4 because of deadweight and gap (for example the screw of motor 9 and be used for the gap of the tooth bar of mobile focusing barrel 4) to moving than the direction of horizontal positioned further from imaging apparatus 5.Moreover than the low low temperature of normal temperature the time and the thermal expansivity of shading member 7 when bigger than lens barrel 1 and motor 9, shading member 7 is positioned at the direction of far going from photoelectric sensor 8.

Therefore, shown in the P5 of the photoelectric sensor output level of Figure 18 (b), during with normal temperature and the photoelectric sensor output level P2 during horizontal positioned compare, the moment that the photoelectric sensor output level changes when initial point detects postpones.At this, show such example, that is, will be made as for 1 step at the on-position of motor 9 owing to the error that produces from the normal temperature cooling, camera head was made as for 1 step from the error that horizontal positioned produces when the downside at the on-position of motor 9, produces and amount to 2 step errors.

Therefore, Δ Pd=-2, thus calculate Pd2=-2 at step 602b.Judge in step 603 whether Pd2 is negative value, is under the situation of negative value in the Pd value, in step 603a, calculate Pd=Pd+ (1 cycle of on-position) and afterwards, enter next step, Pd be 0 or on the occasion of situation under, directly enter next step.At this, Pd2 is-2+8=6.

In step 604, make motor 9 move for 2 steps (the on-position counter is subtracted 2 at every turn) to (direction of imaging apparatus 5) to the initial point detection side at every turn.Wherein, on-position is set at comprises the Pd2 that before obtained (being Pd2=6) at this.More specifically, according to instruction, make on-position counter 151 countdowns by tracing positional control part 152 from systems control division 13.In focus motor drive division 11,, condenser lens 4 is moved to the direction of imaging apparatus 5 by making motor 9 along with this countdown is rotated.

In step 605, judge whether current on-position is (at this, Pd2=6) identical with Pd2.If different, then return step 602b, make focus motor carry out the next one 2 step action.If identical, then enter next step 606.The position of Pd2=6 is with the judgement (n-3) shown in Figure 18 (b), judges (n-2), judges (n-1), judges the position that (n) represents.Therefore these judge that respectively the position is that on-position becomes 6 position, are the positions (from the near position of imaging apparatus 5) that postponed for 2 steps than the position of the on-position before the corrected value that adds 0.Therefore, these respectively judge the judgement of position, during with the position probing normal temperature that at on-position is 0 and the situation of the photoelectric sensor output level P2 during horizontal positioned identical in fact.

In step 606, judge above-mentioned whether position judgment photoelectric sensor output level has surpassed threshold value.When not surpassing, return step 602b, make focus motor carry out the next one 2 step action.When surpassing, enter step 607, absolute position counter 153 is being predisposed to-(1 cycle of on-position)/2+ Δ Pd above the moment.

At this,, be predisposed to " 6 " (numerical value that the usefulness zero of the absolute position counter shown in Figure 18 (b) is surrounded) according to (1 cycle of on-position)=8, Δ Pd=-2.Have again, in the explanation of Fig. 9 of second embodiment, do not show when step 305 or step 306 do not satisfy condition and return the example of step 304, but the example that returns step 602b has been shown in the 5th embodiment.This is because when in initial point detection action temperature variation or posture difference having taken place, change one by one and judge whether the photoelectric sensor output level surpasses the judgement position of threshold value.

The photoelectric sensor output level of the usefulness among Figure 18 " P2 " expression, the level that is illustrated under the condition of mechanism that environment for use temperature identical when adjusting with operation and humidity causes and electrical characteristics changes, but, when repeating the common use of power connection sometimes, represented as " P4 " or " P5 ", the gap, mechanism and the electrical characteristics deviation equal error that the environment for use temperature variation causes of the lens unit driving direction of this moment cause producing deviation in the position that level changes with respect to the on-position of motor 9.

But, in the 6th embodiment, initial point when using usually detects action, whether surpassed threshold value at as shown in figure 18 the position judgment photoelectric sensor output level of respectively judging, therefore, even in scope, produced under the situation of deviation, when the count value of absolute value counter 153 is " 0 " from " P4 " to " P5 ", the on-position of motor 9 must become " 4 ", the origin position in the time of can reproducing the operation adjustment that illustrates in first embodiment.

Have again, show the example of serviceability temperature sensor and angular transducer, still, improve the error that the hygroscopic coefficient difference because of lens barrel, lens etc. produces, can further improve precision by using humidity sensor at this.Moreover, in the 6th embodiment, can detect action with the initial point that 2 times speed is carried out when the common action of first embodiment explanation.

And, can detect at serviceability temperature sensor and angular transducer etc. under the situation of the gap of lens unit driving direction, mechanism that the environment for use temperature variation causes and electrical characteristics deviation equal error, even surpass under the situation of on-position 1 periodic regime in its error, also can proofread and correct.

Figure 20 is the chart of the relation of expression zoom position of the 6th embodiment and focal position.L1 is expression when will the distance from the fixed lens front surface to subject for example being made as 2m, is keeping the curve that concerns between the zoom position that carries out the zoom action under the state of focusing state and the focal position.

The zoom position of transverse axis " T " represents to look in the distance side, " W " expression wide-angle side.Detect at the initial point that does not have focus under the perfect condition of deviation, when will distance being made as 2m from the fixed lens front surface to subject, determined under the situation of focal position in " T " side, when zoom position being moved to " W " side, while can keep the focusing state action of focusing along the curve of L1.

The gap that temperature sensor 16 among use Figure 16 and angular transducer 17 can detect the lens unit driving direction, mechanism and the electrical characteristics deviation equal error that the environment for use temperature variation causes, therefore, after origin position detects, consider that origin correction amount Δ X shown in Figure 20 comes focal-position correction.

At this, the focal position that shows " T " side is positioned under the state of normal temperature and horizontal positioned from the position of initial point X0, at high temperature and the example proofreaied and correct under the state down.At high temperature, because of the thermal expansion of lens barrel 1, each lens broadens than design load at interval, needs this condenser lens 4 is moved to imaging apparatus 5 sides.In addition, under state down, condenser lens 4 is compared towards the direction of far going from imaging apparatus 5 when same level is placed and is moved because of deadweight and deviation.

Therefore, with condenser lens 4 high temperature and down the total position correction amount under the state be made as Δ X, obtain X0-Δ X, proofread and correct condenser lens 4 from the position of initial point, thereby, carry out zoom on one side and move on one side can keep focusing state from " T " side to " W " side.

Have, in the 6th embodiment, the example of the situation that the angle of having considered lens barrel when using usually is different with temperature has been described when operation is adjusted, still, these structures are not necessarily optimal.For example, suppressed in the structure self of lens barrel etc. to be suitable for the structure of first to fourth embodiment under the situation of change of the photoelectric sensor output level that causes because of angle and temperature variation.

In addition, in the 6th embodiment, the both sides' that possess angular transducer and temperature sensor example has been described, but also can have possessed wherein a kind of.For example, do not become under the situation of specific question, can only carry out the correction of angular transducer in the change of shifting one's position of the photoelectric sensor output level that causes because of temperature variation.

In addition, in the 6th embodiment, the add example of Δ Pd of the step 602b that shows at Figure 19, but also can deduct Δ Pd.

In addition, in above-mentioned the second, the 4th, the 6th embodiment, the initial point that shows when using usually detects in the action example of 2 times speed drive lens unit when adjusting with operation, but be not limited thereto, also can move by 4 times speed or the speed more than it.That is, can be, be under the situation of T 1 cycle length of the drive signal when operation is adjusted, and the drive signal when using usually is made as the T ' of above-mentioned formula (4) 1 cycle length, output M/N periodic drive signal.

In addition, in the 4th embodiment, the 6th embodiment, when operation is adjusted and usually 1 cycle length of the drive signal during use is identical.

In addition, use and the cycle 8 of the drive signal of motor to be cut apart and 32 on-positions of cutting apart are illustrated, cut apart or 16 cut apart, do not depend on and cut apart number but can be set at 4 according to the precision of obtaining.

In addition, the example that uses step motor as driving mechanism being described in the respective embodiments described above, still, so long as that the excitation signal of motor has a periodic motor is just passable, for example can be linear motor etc.

(the 7th embodiment)

Below, the 7th embodiment of the present invention is described.The drive unit of the 7th embodiment also possesses the structure shown in Fig. 1,2.Below, with reference to Figure 21 its action is described.Figure 21 is that the initial point of the operation of the 7th embodiment when adjusting detects action specification figure." on-position " represented among Figure 21 is corresponding with the phase place of drive signal, to carry out 8 from 1 cycles 360 degree of drive signal that focus motor drive division 11 outputs to the motor coil of motor 9 and cut apart, 3 count values that are used as on-position counter 151 show.At this, show along with condenser lens 4 to imaging apparatus 5 side shiftings, on-position subtracts 1 state at every turn.

" A phase current " and " B phase current " is the current waveform that outputs to the motor coil of motor 9 from focus motor drive division 11, shows the example that motor 9 has A phase and B 2 phase coils mutually.The electric angle of A phase current and B phase current (1 cycle of current waveform is made as 360 when spending) is mutual deviation 90 degree phase places mutually, by applying electric current mutually and on the B motor coil mutually at A, motor 9 are rotated.At this,, make condenser lens 4 to imaging apparatus 5 side shiftings with the condition of A phase current than the leading 90 degree phase places of B phase current.

The count value of " absolute position counter " expression absolute position counter 153 is synchronously moved with on-position.Subtract at 1 o'clock at on-position, the absolute position counter subtracts 1 equally at every turn at every turn.Wherein, the absolute position counter is set at bit wide, does not have identical value in the moving range of condenser lens 4.

" photoelectric sensor output level " expression is moved and is utilized shading member 7 shield light electric transducers 8, the state that output level is changed to the direction of imaging apparatus 5 by condenser lens 4.If every 1 step of variation of the on-position of motor 9, the photoelectric sensor output level for example changes 0.2V.At this moment, think and pass through built-in AD transducer that digital value has changed 17 at systems control division 13.

As the back explanation, systems control division 13 judges whether the photoelectric sensor output level has surpassed threshold value.For example, the digital value of the 1st threshold value after with the AD conversion can be made as 195 (being approximately 2.3V in the AD conversion input part), the 2nd threshold value is made as 127 (being approximately 1.5V in the AD conversion input part) with digital value.The 2nd threshold value is the value of the on-position with respect to the 1st threshold value motor 9 when changing for 4 steps, i.e. the value of the photoelectric sensor output level a during semiperiod (electric angle 180 degree) in 9 rotating excitation cycles of motor (electric angle 360 degree).

Then, specify the initial point detection action of the condenser lens 4 in the operation adjustment with reference to Figure 21, Figure 22.Figure 22 is that the initial point of the 7th embodiment of the present invention detects action flow chart, and expression is programmed in the motion flow in the systems control division 13.When energized, handle from " initial point detects and adjusts ".

In step 111, motor 9 is moved to (direction of imaging apparatus 5) to the initial point detection side length by length.At this moment, on-position counter 151 subtracts 1 at every turn.More specifically, according to instruction, carry out countdown by 152 pairs of on-position counters of tracing positional control part 151 from systems control division 13.At focus motor drive division 11,, the direction of condenser lens 4 to imaging apparatus 5 moved by making motor 9 along with this countdown is rotated.

In step 112, judge whether the photoelectric sensor output level has surpassed the 1st threshold value.Do not having to return step 111 under the situation of the 1st threshold value of surpassing, making motor 9 carry out the next one 1 step action.Under situation about surpassing, enter step 113, will be above on-position substitution P constantly.In Figure 21, owing to surpass the 1st threshold value at on-position " 0 ", so with on-position " 0 " substitution P.

In step 114, store P into nonvolatile memory 14 as Po.In step 115, the absolute position counter is resetted.In Figure 21, the position of representing with " 0 " becomes the position that is reset.

Then, the initial point of the condenser lens 4 during to common use detects action and carries out following explanation with reference to Figure 23, Figure 24.Initial point when Figure 23 is the common use of the 7th embodiment detects action specification figure.Initial point when Figure 24 is the common use of the 7th embodiment detects action flow chart, and expression is programmed in the motion flow in the systems control division 13.In addition, identical for the on-position of representing among Figure 23, A phase current, B phase current, absolute position counter and photoelectric sensor output level with the explanation among Figure 21, the therefore explanation of omitting repeating part.

In Figure 24, when energized, handle from " initial point detection ".In step 211, read Po from nonvolatile memory 14.In step 212, with Po substitution Pd.The initial point of the condenser lens 4 when above-mentioned operation is adjusted detects in the action, and the value that is stored in the nonvolatile memory 14 is " 0 ".Therefore, in this embodiment, Pd=0.

In step 214, make motor 9 move (making the on-position counter subtract 1) to the initial point detection side to (imaging apparatus 5 directions) length by length at every turn.More specifically, according to instruction, carry out countdown by 152 pairs of on-position counters of tracing positional control part 151 from systems control division 13.At focus motor drive division 11,, the direction of condenser lens 4 to imaging apparatus 5 moved by making motor 9 along with this countdown is rotated.

In step 215, judge current on-position whether with Pd (in this embodiment, Pd=0).If inequality, then return step 214, make motor 9 carry out the next one 1 step action.If identical, then enter next step 206.In the example of Figure 23, with judging (n-2), judge (n-1), judging the position that (n) indicates, on-position is identical with Pd (Pd=0).In step 216, judge whether surpassed threshold value at these each photoelectric sensor for position output levels.

At first, in the position of judging (n-2), judge whether the photoelectric sensor output level has surpassed the 2nd threshold value.In the example of Figure 23,,, make motor 9 carry out the next one 1 step action so return step step 214 owing to do not surpass the 2nd threshold value.When becoming the position of judgement (n-1), judge once more whether the photoelectric sensor output level has surpassed the 2nd threshold value when repeating the action of 1 step.In the example of Figure 23, do not surpass the 2nd threshold value, so return step 214, make focus motor carry out the next one 1 step action.When becoming the position of judgement (n), judge once more whether the photoelectric sensor output level has surpassed the 2nd threshold value when repeating the action of 1 step.In the example of Figure 23, do not surpass the 2nd threshold value.At this moment, enter step 207, absolute position counter 153 is predisposed to 0 (numerical value of usefulness zero encirclement of absolute position counter as shown in figure 23).

At this, the photoelectric sensor output level of representing with P2 among Figure 23, the level that is illustrated under the condition of mechanism that environment for use temperature identical when adjusting with operation and humidity causes and electrical characteristics changes.But, when repeating the common use of power connection sometimes, shown in P1 or P3,, produce deviation from the position that P2 changes at the photoelectric sensor output level at each on-position of motor 9.This is that gap, environment for use temperature and the humidity of the lens unit driving direction thus the time changes the mechanism and the electrical characteristics deviation equal error that cause and causes.

In the present embodiment, as mentioned above, the initial point when using usually detects action, is in judgement shown in Figure 23 (n-2), judges (n-1), judges in (n) and judge whether the photoelectric sensor output level has surpassed the 2nd threshold value.The 1st threshold value the when threshold value under this situation is not the operation adjustment, but the 2nd threshold value.

Suppose to set the threshold to the 1st threshold value,, then can correctly reproduce origin position if the level of photoelectric sensor output level changes when adjusting with operation identical (P2 of Figure 23).But, as previously mentioned, when in level changes, producing deviation (P1 of Figure 23, P3), also produce deviation in the detected origin position.

In the present embodiment, as previously mentioned, the 2nd threshold value is the 1st threshold value when adjusting with respect to operation, the value of photoelectric sensor output level during the on-position of motor 9 is in a leading position the excitation semiperiod position of (electric angle 180 degree).Therefore, as shown in figure 23,, judging that position n is judged as the situation that has surpassed the 2nd threshold value and can change even the photoelectric sensor output level has deviation at P1 or P3.Equally, judging that position n-1, n-2 are judged as the situation that does not surpass the 2nd threshold value and also can change.

Thus, even produced deviation in the scope of P1 to P3, when the absolute position counter that presets was " 0 ", the on-position of motor 9 must become " 0 ", the origin position in the time of can correctly reproducing the operation adjustment.That is, be no more than the 2nd threshold value, the next photoelectric sensor output level of judging the position above the 2nd threshold value, then can correctly detect origin position if detect certain photoelectric sensor output level of judging the position.

Wherein, the error span of mechanism that the gap of lens unit driving direction, environment for use temperature and humidity variation cause and electrical characteristics deviation etc. need be suppressed in the on-position scope in 1 cycle.

In the present embodiment, also can prevent from Fig. 7 focal position skew such, that the skew of initial point detection position causes to be described at above-mentioned first embodiment.Promptly, according to present embodiment, the initial point of the influence of the error of mechanism that can realize not being subjected to gap, environment for use temperature and the humidity of the driving direction of lens unit to change causing and electrical characteristics deviation etc. detects action, so, can improve the absolute positional accuracy of condenser lens unit largely, especially carrying out in the system of zoom action while keeping focusing state, present embodiment is effective.

Have again, in the present embodiment, the difference of the 1st threshold value and the 2nd threshold value is illustrated as the difference suitable with the semiperiod in motor excitation cycle, but this difference is not limited thereto, as long as in the scope of the deviation effects that is not subjected to the photoelectric sensor output level.

For example, the 2nd threshold value can be set at, at the on-position corresponding with origin position with the value in the scope of the photoelectric sensor output level when leaving between the on-position in 1 cycle in motor excitation cycle from this on-position.

In addition, the 2nd threshold value can also be a predefined value before operation is adjusted, and also can set when operation is adjusted.For example, initial point when operation is adjusted detects in the action, also can the photoelectric sensor output level of per 1 step action of motor 9 be stored by systems control division 13, when the photoelectric sensor output level arrives the 1st threshold value, the photoelectric sensor output level before 4 steps is stored as the 2nd threshold value in nonvolatile memory 14.Thus, the characteristic deviation of correcting photo sensor can be tried to achieve correct threshold value.

(the 8th embodiment)

Below, the 8th embodiment of the present invention is described.Structure shown in Fig. 1,2 and the initial point when adjusting with the operation of Fig. 21, Figure 22 explanation detect action, and be also identical in the 8th embodiment.

With reference to Figure 25,26, the initial point of the condenser lens 4 when the common use in the 8th embodiment is described detects action.Initial point when Figure 25 is the common use of the 8th embodiment detects action specification figure.For the on-position of representing among Figure 25, A phase current, B phase current, absolute position counter and photoelectric sensor output level, since same with the explanation among Fig. 3, the therefore explanation of omitting repeating part.

In the 8th embodiment, different with the 7th embodiment, along with condenser lens 4 to imaging apparatus 5 side shiftings, on-position subtracts 2 at every turn.Therefore, the count value with the absolute position counter 153 of on-position synchronization action also subtracts 2 at every turn.Wherein, the absolute position counter is set at bit wide and does not have identical value in the moving range of condenser lens 4.

At the 7th embodiment, as Figure 21, shown in Figure 23, when operation is adjusted and under normally used arbitrary situation, be T 1 cycle length of drive signal, but in the 8th embodiment, as shown in figure 25, be T/2 1 cycle length of the drive signal when using usually.Thus, in the 8th embodiment, the initial point in the time of can using usually with 2 times of speed of the 7th embodiment detects action.

Initial point when Figure 26 is the common use of the 8th embodiment detects action flow chart, and expression is programmed in the motion flow in the systems control division 13.When energized, handle from " initial point detection ".In step 311, read Po from nonvolatile memory 14.In step 312, with Po substitution Pd.In the 8th embodiment, the example that the value that is stored in nonvolatile memory 14 and first embodiment are similarly " 0 " has been described also.Therefore, in the present embodiment, Pd=0.

In step 314, make motor 9 move (making the each minimizing 2 of on-position counter) 2 steps to (direction of imaging apparatus 5) to the initial point detection side at every turn.Wherein, on-position is set at comprises earlier the Pd that preceding obtains (being Pd=0) at this.

More specifically, according to instruction, make on-position counter 151 carry out countdown by tracing positional control part 152 from systems control division 13.In focus motor control part 11, rotate with this countdown by making motor 9, the direction of condenser lens 4 to imaging apparatus 5 moved.

In step 315, judge whether current on-position is (in this embodiment, Pd=0) identical with Pd.If inequality, then return step 314, make motor 9 carry out following 2 steps action.If identical, then enter next step 316.

Judge that the position is with judgement shown in Figure 25 (n-3), judges (n-2), judges (n-1), judges the position that (n) represents, judges in step 316 whether the photoelectric sensor output level has surpassed the 2nd threshold value.When not surpassing, return step 314, make motor 9 carry out the next one 2 step action.When surpassing, enter step 317, and absolute position counter 153 is being predisposed to 0 (numerical value that the usefulness zero of absolute position counter shown in Figure 25 is surrounded) above the moment.

These actions during the step 314 to 317 are with identical with the action between the step 214 to 217 of Figure 24 explanation at above-mentioned the 7th embodiment.In addition, the photoelectric sensor output level has produced in the scope of P1 to P3 under the situation of deviation, the origin position in the time of can reproducing the operation adjustment reliably, and this point is also identical with the 7th embodiment.In addition, in the 8th embodiment, the initial point in the time of can using usually with 2 times of speed of the 7th embodiment detects action.

In addition, the error span of mechanism that the gap of lens unit driving direction, environment for use temperature and humidity variation cause and electrical characteristics deviation etc. need be suppressed in the on-position scope in 1 cycle, and this is identical with the 7th embodiment.

(the 9th embodiment)

The following describes the 9th embodiment of the present invention.Structure shown in Fig. 1,2 and the initial point when adjusting with the operation of Figure 21, Figure 22 explanation detect action, and be also identical in the 9th embodiment.

The initial point of the condenser lens 4 during with reference to the common use in Figure 27,28 explanations the 9th embodiment detects action.Initial point when Figure 27 is the common use of the 9th embodiment detects action specification figure.For the on-position of representing among Figure 27, A phase current, B phase current, absolute position counter and photoelectric sensor output level, since same with the explanation among Figure 21, the therefore explanation of omitting repeating part.

Figure 28 is the process flow diagram that the power-off of the 9th embodiment is handled, and expression is programmed in the motion flow in the systems control division 13.In the figure, the power supply that shows in camera head main bodys such as still image camera or video cameras when being closed, carries out the example to the transfer processing of power-off by main body switch (not shown).

When power supply was closed, systems control division 13 was handled from " power-off processing ".In step 411, make motor 9 move for 2 steps (the on-position counter is subtracted 2 at every turn) to (direction of imaging apparatus 5) to the initial point detection side at every turn.Wherein, on-position is set at comprises the Pd that illustrates in the 8th embodiment (being Pd=0) at this.More specifically, according to instruction, carry out countdown by 152 pairs of on-position counters of tracing positional control part 151 from systems control division 13.In focus motor drive division 11,, the direction of condenser lens 4 to imaging apparatus 5 moved by make motor 9 rotations along with this countdown.

In step 412, when inconsistent, turn back to step 411 in 1 cycle of the count value of absolute position counter 153 and on-position, make focus motor carry out the next one 2 step action.When unanimity, handle and enter step 413, close the power supply of main body.At this, because (1 cycle of on-position)=8, therefore, (absolute position count value)=8 o'clock, the main body power supply was closed (with reference to Figure 27).

Then, for the action when the main body switch connection power supply, as illustrating with Figure 26 in the 8th embodiment, when energized, handle according to process flow diagram from " initial point detection ".Because explanation midway repeats, therefore omit, but, judge that whether the photoelectric sensor output level is above the 2nd threshold value in the step 316 of Figure 26, the count value of absolute position counter 153 is predisposed to " 0 " (numerical value of usefulness zero encirclement of absolute position counter as shown in figure 27).

As shown in figure 27, in the power-off transfer processing, stop focus motor at the tight front of origin position (photoelectric sensor output level will surpass threshold value before).Therefore, in the 9th embodiment, the judgement of the photoelectric sensor output level during the initial point during energized detects is with initial once just finishing.More specifically, be origin position because the count value of absolute position counter becomes the position of " 0 ", therefore, the stop position that count value is consistent with 1 cycle of on-position is, than the go ahead of the rest judgement position of side, final judgement position.That is, in the present embodiment, have such feature, promptly the position that focus motor 9 is stopped by the power-off transfer processing is, carries out the judgement position before 1 step of position of final judgement of photoelectric sensor output level when energized next time.

Carry out the power-off transfer processing as described above, even the gap of the driving direction of lens unit, environment for use temperature and humidity change mechanism and the electrical characteristics deviation equal error that causes, under the situation about producing during before power connection next time, also can carry out initial point reliably and detect by the judgement of initial photoelectric sensor output level once.

Have, the gap of lens unit driving direction, environment for use temperature and humidity change the error span of the mechanism that causes and electrical characteristics deviation etc. again, need be suppressed in the on-position scope in 1 cycle, and this is identical with the 7th embodiment, the 8th embodiment.

(the tenth embodiment)

Below, the tenth embodiment of the present invention is described.Structure shown in Fig. 1,2 is also identical in the tenth embodiment.With reference to Figure 29,30, the initial point of the condenser lens 4 when the operation adjustment in the tenth embodiment is described detects action.

Figure 29 is that the initial point of the operation of the tenth embodiment when adjusting detects action specification figure.On-position, A phase current, B phase current, absolute position counter and the photoelectric sensor output level represented about Figure 29, identical with the explanation among Figure 21 of the 7th embodiment, the therefore explanation of omitting repeating part.In addition, along with condenser lens 4 to imaging apparatus 5 side shiftings, on-position subtracts 1 at every turn, this point also identical with the 7th embodiment.

Figure 30 is that the initial point of the operation of the tenth embodiment when adjusting detects action flow chart, and expression is programmed in the motion flow in the systems control division 13.When energized, handle from " initial point adjustment ".In step 511, for example adjust the upward demonstration " main body up " of liquid crystal display picture (not shown) of menu in operation.The lens 2 that make camera head enter next step 512 behind the top.

In step 512, make motor 9 move for 1 step (the on-position counter subtracts 1 at every turn) to (direction of imaging apparatus 5) to the initial point detection side at every turn.More specifically, according to instruction, carry out countdown by 152 pairs of on-position counters of tracing positional control part 151 from systems control division 13.At focus motor drive division 11,, the direction of condenser lens 4 to imaging apparatus 5 moved by making motor 9 along with this countdown is rotated.

In step 513, judge whether the photoelectric sensor output level has surpassed the 1st threshold value.When not surpassing threshold value, return step 512, make motor 9 carry out the next one 1 step action.When surpassing, enter step 514, will be above on-position substitution Pu constantly.At this, with on-position " 2 " substitution Pu.

Then, in step 515, for example the liquid crystal panel at operation adjustment menu shows demonstration " main body down " in (not shown).The lens 2 that make camera head enter next step 516 down.In step 516, make motor 9 move for 1 step (the on-position counting subtracts 1 at every turn) to (direction of imaging apparatus 5) to the initial point detection side at every turn.

In Figure 29, why produce from " state up " photoelectric sensor output level when " state down " changes posture jump be because, condenser lens 4 because of deadweight and deviation (for example being used for the gap between the tooth bar of the guiding bolt of mobile motor 9 and condenser lens 4) to from imaging apparatus 5 away from direction move.

In step 517, judge whether the photoelectric sensor output level has surpassed the 1st threshold value.Under situation about not surpassing, return step 516, make motor 9 carry out the next one 1 step action.Under situation about surpassing, enter step 518, will be above on-position substitution Pd constantly.

At this, with on-position " 6 " substitution Pd.In step 519, judge the size of Pd and Pu.At this, Pu=2, therefore Pd=6 enters next procedure 519a.At step 519a, calculate Pd=Pd-(1 cycle of on-position), because Pd=-2 is obtained in on-position 1 cycle=8.When the value of using this Pd is obtained P by the calculating formula of step 520, become P=INT ((2-2)/2)=0.Have, INT represents below the fractions omitted point again.At this moment, owing in step 521, be not P＜0,, P=0 is stored in the nonvolatile memory as Po so enter next step 522.

In step 523, the count value of absolute position counter 153 is predisposed to-INT ((Pu-Pd)/2).The value of-INT ((Pu-Pd)/2) is-INT ((2+2)/2)=-2.Calculate by this, what leave between the origin position of origin position in the time of can calculating on-position and the centre up the time and down the time down.As shown in figure 29, if the numerical value of the absolute position counter of the origin position in the time of will be down is made as-2 (with zero numerical value that surrounds) of calculated value, then the count value of the absolute position counter 153 of the origin position (on-position " 0 ") of the centre up the time and down the time becomes " 0 ".

Have, P in step 521＜0 o'clock does not have the numerical value of corresponding on-position again, but the calculating by step 521a can be obtained the on-position suitable with the P of step 520.

In addition, in above-mentioned example, the example of Pd＞Pu in step 519 has been described, if Pd≤Pu then directly enters step 520 and gets final product.Under the situation of Pd≤Pu,, also can obtain the centre position of Pu and Pd by the calculating of step 520 even do not proofread and correct the value of Pd by step 519a.

As previously mentioned, in the tenth embodiment, the origin position of storage becomes at the state and the centre position of the detected origin position of state difference up down in the nonvolatile memory 14, in the initial point of not considering the posture difference as illustrating in first embodiment is adjusted, the situation that for example produces posture difference up when adjusting and produced posture difference down when using usually that coexists is compared, and the lens position error that the posture difference can be caused in the tenth embodiment is improved as 1/2.

In addition, in the tenth embodiment, illustrated that at first carry out initial point under the state detects up, then state carries out the example that initial point detects down, but under the situation of considering the gap, if a side of state compares further from origin position than state down up, carry out at first then down that state initial point down detects, then carry out the initial point detection under the state up just passable.

In addition, in the camera head of deviation with specification specifies of the initial point detection position that the posture difference causes, the state or carry out initial point under a certain state in the state down and detect up, and by will obtaining same effect from half position of detected offset specification as initial point.

In addition, example in the present embodiment is to cause with the posture difference because of lens barrel that to be equipped with deviation at the initial point detecting position be prerequisite, but as long as the precision of lens barrel can be guaranteed degree for the deviation of the initial point detection position that not do not cause because of the posture difference of lens barrel, then also can be the structure of above-mentioned the 7th embodiment to the nine embodiments.

(the 11 embodiment)

Below, the 11 embodiment of the present invention is described.The drive unit of the 11 embodiment has temperature sensor and angular transducer, has Figure 16, structure shown in Figure 17.

Below, with reference to Figure 31,32, the initial point of the condenser lens 4 during to the common use of the 11 embodiment detects action and describes.Initial point when Figure 31 is the common use of the 11 embodiment detects action specification figure.When Figure 31 (a) has supposed that temperature is higher than normal temperature and lens 2 state up of lens barrel 1, when Figure 31 (b) has supposed that temperature is lower than normal temperature and lens 2 state down of lens barrel 1.

The on-position that Figure 31 represents, A phase current, B phase current, absolute position counter and photoelectric sensor output level, identical with the explanation among Fig. 3 of first embodiment, the therefore explanation of omitting repeating part.In addition, along with condenser lens 4 to imaging apparatus 5 side shiftings, on-position subtracts 2 at every turn, this example with Figure 25 of the 8th embodiment is identical.

Initial point when Figure 32 is the common use of the 11 embodiment detects action flow chart, and expression is programmed in the motion flow in the systems control division 13.When energized, handle from " initial point detection ".In step 611, read Po from nonvolatile memory 14.In step 612a, establish Pd=Po.The initial point of the condenser lens 4 when operation is adjusted detects in the action, and is same with the 7th embodiment, and the value that is stored in the Po in the nonvolatile memory 14 is made as " 4 ".Therefore, become Pd=0.

At step 612b, according to output information from temperature sensor 16 and angular transducer 17, correction up value Δ Pd on Pd.Under lens 2 situation up with lens barrel 1, more close imaging apparatus 5 directions move condenser lens 4 to than horizontal positioned the time because of deadweight and gap (for example the screw of motor 9 and be used for gap between the tooth bar of mobile focusing lens 4).And, when temperature is higher than normal temperature and the thermal expansivity of shading member 7 than under the big situation of lens barrel 1 and motor 9, shading member 7 is positioned at the direction near photoelectric sensor 8.

Therefore, shown in the photoelectric sensor output level P4 of Figure 31 (a), the photoelectric sensor output level P2 during with normal temperature and horizontal positioned compares, and the moment that the photoelectric sensor output level changes when initial point detects ahead of time.At this, show such example: will the on-position of motor 9 because of the error that produces from the normal temperature ascending temperature as 1 step and will the on-position of motor 9 from the horizontal positioned of camera head towards on the time error that produces as 1 step, produce and amount to 2 step errors.

Therefore, Δ Pd=2, thus calculate Pd2=2 at step 602b.Judge in step 613 whether Pd2 is negative value, Pd be 0 or on the occasion of situation under, directly enter next step 614.At Pd is under the situation of negative value, at step 613a, calculates Pd2=Pd2+ (1 cycle of on-position) and afterwards, enters next step 614.At Pd2 is under the situation of negative value, through the reason of step 613a, identical with the reason of the step 521a of process Figure 30 in the tenth embodiment.

In step 614, make motor 9 move for 2 steps (the on-position counter subtracts 2 at every turn) to (direction of imaging apparatus 5) to the initial point detection side at every turn.Wherein, on-position is set at comprises the Pd2 that before obtained (being Pd2=2) at this.More specifically, according to instruction, carry out countdown by 152 pairs of on-position counters of tracing positional control part 151 from systems control division 13.At focus motor drive division 11,, the direction of condenser lens 4 to imaging apparatus 5 moved by making motor 9 along with this countdown is rotated.

In step 615, judge whether current on-position is identical with Pd2 (Pd2=2 in this example).If different, then return step 612b, make focus motor carry out the next one 2 step action.If identical, then enter next step 616.

The position of Pd2=2 is with the judgement (n-2) shown in Figure 31 (a), judges (n-1), judges the position that (n) represents.These judge that respectively the position is that on-position becomes 2 position, therefore are than the position (from the position that imaging apparatus 5 far goes) in leading 2 steps, the position of the on-position before the correction up value 0.So these judgements of respectively judging the position are, during with the position probing normal temperature that at on-position is 0 and the situation of the photoelectric sensor output level P2 during horizontal positioned identical in fact.

In step 616, judge and judge above-mentioned whether the photoelectric sensor for position output level has surpassed the 2nd threshold value.When not surpassing, return step 612b, make focus motor carry out the next one 2 step action.When surpassing, enter step 617, and absolute position counter 153 is being predisposed to Δ Pd above the moment.At this, because Δ Pd=2 is predisposed to " 2 " (numerical value that the usefulness zero of the absolute position counter shown in Figure 31 (a) is surrounded).

Have again, in the explanation of Figure 26 of the 8th embodiment, show the example that when step 315 or step 316 do not satisfy condition, returns step 314, but show the example that returns step 612b at the 11 embodiment.This is because in the 11 embodiment, when in the initial point detection action temperature variation or posture difference having taken place, change successively and judge whether the photoelectric sensor output level surpasses the judgement position of threshold value.

Below, the lens 2 that explanation makes lens barrel 1 with reference to Figure 31 (b), Figure 32 are down and the temperature situation low than normal temperature.Under lens 2 situation down of lens barrel 1, the direction further from imaging apparatus 5 to than horizontal positioned the time moves condenser lens 4 because of deadweight and gap (for example screw of motor 9 and the gap that is used for the tooth bar of mobile focusing barrel 4).In addition, when the thermal expansivity of and shading member 7 low than normal temperature is bigger than lens barrel 1 and motor 9, shading member 7 be positioned at from photoelectric sensor 8 away from direction.

Therefore, shown in the P5 of the photoelectric sensor output level of Figure 31 (b), during with normal temperature and the photoelectric sensor output level P2 during horizontal positioned compare, the moment that the photoelectric sensor output level changes when initial point detects postpones.At this, show such example: will be at the on-position of motor 9 because of the error that produce from the normal temperature cooling as 1 step and the error that will produce down the time from the horizontal positioned of camera head at the on-position of motor 9 as 1 step, produce and amount to 2 and go on foot errors.

Therefore, Δ Pd=-2, thus calculate Pd2=-2 at step 612b.Judge in step 613 whether Pd2 is negative value, under the situation that is negative value, calculate Pd2=Pd2+ (1 cycle of on-position) at step 613a and afterwards, enter next step, be 0 or on the occasion of situation under, directly enter next step.At this, Pd2 becomes-2+8=6.

In step 614, make motor 9 move for 2 steps (the on-position counter subtracts 2 at every turn) to (direction of imaging apparatus 5) to the initial point detection side at every turn.Wherein, on-position is set at comprises the Pd2 that before obtained (being Pd2=6) at this.More specifically, according to instruction, carry out countdown by 152 pairs of on-position counters of tracing positional control part 151 from systems control division 13.At focus motor drive division 11,, condenser lens 4 is moved to the direction of imaging apparatus 5 by making motor 9 along with this countdown is rotated.

In step 615, judge whether current on-position is identical with Pd2 (Pd2=6 in this example).If different, then return step 612b, make focus motor carry out the next one 2 step action.If identical, then enter next step 616.The position of Pd2=6 is with the judgement (n-3) shown in Figure 31 (b), judges (n-2), judges (n-1), judges the position that (n) represents.Therefore these judge that respectively the position is that on-position becomes 6 position, are the positions (from the near position of imaging apparatus 5) that postponed for 2 steps than the position of the on-position before the correction up value 0.Therefore, these judgements of respectively judging the position are, the situation of the photoelectric sensor output level P2 when at on-position being 0 position probing normal temperature and horizontal positioned is identical in fact.

In step 616, judge and judge above-mentioned whether the photoelectric sensor for position output level has surpassed threshold value.When not surpassing, return step 612b, make focus motor carry out the next one 2 step action.When surpassing, enter step 617, and absolute position counter 153 is being predisposed to Δ Pd above the moment.

At this, because Δ Pd=-2 is predisposed to " 2 " (numerical value that the usefulness zero of the absolute position counter shown in Figure 31 (b) is surrounded).Have again, in the explanation of Figure 26 of the 8th embodiment, do not show when step 315 or step 316 do not satisfy condition and return the example of step 314, but the example that returns step 612b has been shown in the 11 embodiment.This is because when in the initial point detection action temperature variation or posture difference having taken place, change successively and judge whether the photoelectric sensor output level surpasses the judgement position of threshold value.

Level variation under the condition of the photoelectric sensor output level of the usefulness among Figure 31 " P2 " expression mechanism that identical environment for use temperature and humidity cause when being illustrated in and adjusting with operation and electrical characteristics, but, when repeating the common use of power connection sometimes, such shown in " P4 ", " P5 ", the gap of the lens unit driving direction of this moment, mechanism and the electrical characteristics deviation equal error that the environment for use temperature variation causes, cause on-position, produce deviation in the position that level changes with respect to motor 9.

But, in the 11 embodiment, initial point when using usually detects action, whether surpassed threshold value at as shown in figure 31 the position judgment photoelectric sensor output level of respectively judging, therefore, even to the scope of " P5 ", produced under the situation of deviation, when the count value of absolute value counter 153 is " 0 " at " P4 ", the on-position of motor 9 must become " 0 ", the origin position in the time of can reproducing the operation adjustment that illustrates in the 7th embodiment.

Have again, show the example of serviceability temperature sensor and angular transducer, but also can improve the error that the hygroscopic coefficient difference because of lens barrel and lens etc. produces, further improve precision by using humidity sensor at this.Moreover, in the 11 embodiment, can detect action with the initial point that 2 times speed is carried out when the common action of the 7th embodiment explanation.

And, detect at serviceability temperature sensor and angular transducer etc. under the situation of the gap of the driving direction of lens unit, mechanism that the environment for use temperature variation causes and electrical characteristics deviation equal error, also can proofread and correct even surpass in this error under the situation of 1 periodic regime of on-position.

In addition, the explanation of the zoom action that in the 6th embodiment, illustrates with Figure 20, also identical in the present embodiment.

Have again, in the 11 embodiment, the example of the situation that the angle of having considered lens barrel when using usually is different with temperature has been described when operation is adjusted, but these structures are not necessarily best.For example, suppressed in the structure self of utilizing lens barrel etc. to be suitable for the structure of the 7th embodiment to the nine embodiments under the situation of change of the photoelectric sensor output level that angle and temperature variation cause.

In addition, in the 11 embodiment, the example that possesses angular transducer and temperature sensor has been described, but also can have possessed wherein a kind of.For example, do not become under the situation of special problem, can only utilize the correction of angular transducer in the change of the change location of the photoelectric sensor output level that temperature variation causes.

In addition, in the 11 embodiment, the step 612b that shows at Figure 32 adds the example of Δ Pd, but also can subtract Δ Pd.

In addition, in above-mentioned the 8th embodiment, the 9th embodiment, the 11 embodiment, show the example that initial point when usually using detects in the action 2 times of speed drive lens units when adjusting with operation, but be not limited thereto, also can move with 4 times speed or the speed more than it.That is, can be, be under the situation of T 1 cycle length of the drive signal when operation is adjusted, and is made as T/N (N is the integer more than 2) 1 cycle length of the drive signal when using usually, output 1/N periodic drive signal.

In addition, in the 9th embodiment, the 11 embodiment, when operation is adjusted and usually the time in 1 cycle of drive signal during use is identical.

In addition, use the on-position that the cycle 8 of motor drive signal is cut apart to be illustrated, still,, can be set at 4 and cut apart or 16 cut apart, do not rely on and cut apart number according to the precision of obtaining.

In addition, the example that uses step motor as driving mechanism being described in the respective embodiments described above, still, so long as that the excitation signal of motor has a periodic motor is just passable, for example can be linear motor etc.

(the 12 embodiment)

Below, with reference to description of drawings the 12 embodiment of the present invention.Figure 33 is the skeleton diagram and the block diagram of the camera head of the 12 embodiment.In Figure 33, the 1st, lens barrel, the 19th, camera body.Lens barrel 1 possesses the imaging lens system group, from object side dispose fixed lens group 2 successively as the 1st group of lens, as the fixed lens group 3 of the 2nd group of lens, as the condenser lens 4 of the 3rd group of lens. Fixed lens group 2,3 is fixed on the lens barrel 1.Form motor drive mechanism by motor 9 and motor driving part 11 as focus motor, condenser lens 4 moves on optical axis direction along cutting threaded screw by the rotation of motor 9, can adjust focus.

In the example of Figure 33, motor 9 expressions are according to the step motor of the phase place rotation of the drive signal (excitation signal) of the motor coil of exporting from motor driving part 11.The 5th, as the imaging apparatus of picture pick-up device, be electric signal with the image transformation of the subject that is taken behind transmission fixed lens group 2,3 and the condenser lens 4.The 7th, shading member is fixed on the frame of condenser lens 4.

Shown in the dotted line of Figure 33, the direction of condenser lens 4 to imaging apparatus 5 moved, by cover the photoelectric sensor 8 as position-detection sensor with shading member 7, the origin position that carries out condenser lens 4 detects.

The 12nd, signal processing part according to the electric signal from imaging apparatus 5 outputs, generates view data and the contrast information that is used to focus on adjustment.17 are mounted in the data transmit-receive portion on the lens barrel 1, and the 18th, carry the data transmit-receive portion on camera body 19.The 15th, as the motor control part of the motor control gear of motor 9.The user can focus on adjustment according to the image of being handled by signal processing part 12.In addition, can focus on automatic adjustment (automatic focusing function) according to the contrast information of signal processing part 12, so that contrast becomes maximum.Under any situation, motor control part 15 all passes through data transmit-receive portion 17 and 18, to the driving command of motor driving part 11 output condenser lenses 4.

The 14th, as the nonvolatile memory of storing mechanism, the 16th, power supply applies the information of voltage according to being stored in motor in the nonvolatile memory 14, and setting should be applied to the voltage of motor driving part 11.Its detailed content illustrates in the back.The 20th, temperature sensor, the 21st, change the angular transducer of output according to the posture angle of camera body 19.The output of these each sensors is imported into motor control part 15, is used to carry out the position correction of condenser lens 4.

Figure 34 is the detailed diagram of motor control part 15 shown in Figure 33.In Figure 34, motor control part 15 possesses control part 13, on-position counter 151 and absolute position counter 153.On-position counter 151 is according to focus moving direction and mobile step information from control part 13 outputs, the phase place of the drive signal of control motor 9, and be used to control the incremental calculation or the countdown of the on-position counter of condenser lens 4 positions.

In above-mentioned structure shown in Figure 33, utilize the position of the Spin Control condenser lens 4 of motor 9.In addition, the rotation of motor 9 is then controlled by the periodic drive signal from motor control part 11, and this motor driving part 11 has received signal by data transmit-receive portion 18 and 17 from motor control part 15.

After rigidly connecting energize, control part 13 (will describe in detail in the back) is read the lens control relevant information of storage in the nonvolatile memory 14 that is equipped on the lens barrel 1, focuses on initial point then and detects processing, this point also explanation in the back.In focusing on initial point detection processing, at first, condenser lens 4 is driven to the direction of imaging apparatus 5.When carrying out this driving, by shading member 7 shield light electric transducers 8.The signal level of photoelectric sensor 8 is to should masking amount and change, when under rated condition, surpassing threshold value (perhaps, when not reaching threshold value) according to circuit structure, and the processing that resets or preset absolute position counter 153.

After this processing finished, motor control part 15 was by data transmit-receive portion 18 and 17 control informations to motor driving part 11 transmission motors 9.Motor driving part 11 receives these control informations, and has periodic drive signal, the position control of the line focusing of going forward side by side lens 4 according to this reception information output.As shown in figure 34, from the information that motor control part 15 sends, information that sends through on-position counter 151 and the information that directly sends to data transmit-receive portion 18 from control part 13 are arranged.

The information that sends through on-position counter 151 is the information relevant with the position of condenser lens 4.Control part 13 is according to from the contrast information of signal processing part 12, from the rotary position information of the motor 9 of on-position counter 151 outputs, from the positional information of the condenser lens 4 of absolute position counter 153 outputs, the moving direction and the mobile step information of motor 9 are outputed to on-position counter 151, thereby carry out the position control of condenser lens 4.Directly send to the information of data transmit-receive portion 18 from control part 13, for example have with motor 9 apply information of voltage or the relevant information of maximum drive speed.

And, the count value synchronization action of absolute position counter 153 and on-position counter 151.On-position counter 151 be with the one-period of the driving electric angle of motor 9 (360 degree) be a counter back into the row counting, and absolute position counter 153 is expressions with the value that is reset under the rated condition counter as the absolute position of benchmark.

The transmitting-receiving of the information of lens barrel 1 and video camera 19 is to carry out between data transmit-receive portion 17 and 18, when dialyte lens lens barrel 1 and camera body 19, also separate at data transmit-receive portion 17 and 18 junction surface (not shown) and the junction surface (not shown) between motor driving part 11 and the power supply 16.

In the present embodiment, the motor control part 15 that will not control condenser lens 4 be configured in the lens barrel 1 or separate configuration in lens barrel 1 and camera body 19, but be configured in the camera body 19.Therefore, as the information processing of control store in nonvolatile memory 14, be not in lens barrel 1, to carry out, but the motor control part 15 in camera body 19 carry out.That is, the information via data transmit-receive portion 17,18 in the nonvolatile memory 14 sends to motor control part 15, and is processed in camera body 19, re-sends in the lens barrel 1.According to this structure, the extensive microcomputer that need be provided for controlling in lens barrel 1 can not made lens barrel 1 compactly, can also seek cost degradation by structure.On lens barrel 1, be provided with data transmit-receive portion 17, but this is to be its fundamental purpose with the data between relay len lens barrel 1 and the video camera 19, satisfies the demands with simple structure.

Figure 35 is the action specification figure of data transmit-receive portion 17,18." CK " is the clock that is used for detecting " DATA " (being address, data 1, data 2 and parity check bit at this).To be somebody's turn to do " CK " and send to the data transmit-receive portion 17 of lens barrel 1 from the data transmit-receive portion 18 of camera body 19.The data corresponding with each address are read from nonvolatile memory 14 by data transmit-receive portion 17.

" DE " is the data that output to the data transmit-receive portion 17 of lens barrel 1 side from the data transmit-receive portion 18 of camera body 19.In data transmit-receive portion 17,8 bit data that " DE " is right after after " H " (height) level is changed to " L " (low) level are discerned as the address.Afterwards, in data transmit-receive portion 17,8 bit data after the address during " L " level are discerned as data (is data 1, data 2 at this).

In addition, in 16 bit data, with data 1 as the most-significant byte data, data 2 are received and dispatched as the least-significant byte data, in 24 bit data, with data 1 as the most-significant byte data, with data 2 as in 8 bit data, data 3 are received and dispatched as the least-significant byte data.

Then, 8 bit data that will be right after after " L " level is changed to " H " level are as parity check bit.Parity check bit is for example to calculate [address] XOR[data 1] XOR[data 2] value, this calculating is to carry out in data transmit-receive portion 17, and calculated value is sent to data transmit-receive portion 18.Motor control part 15 receives the data from data transmit-receive portion 18, similarly calculates [address] XOR[data 1 with data transmit-receive portion 17] XOR[data 2], with the parity check bit that is received when inconsistent, transmission or receive data once more once more.

Information in the canned data, that only when the common use of camera head, read in the nonvolatile memory 14 shown in the following table 1 (below be called " memory read win the confidence breath ").The memory read breath of winning the confidence is the information that is written in manufacturing process in the nonvolatile memory 14.

Table 1

The memory read breath of winning the confidence	The address	Data
			Exciting method	0x00	?0x02
The peak response frequency	0x01	?0x0DAC
			Maximum self-starting frequency	0x03	?0x02D0
Motor current	0x05	?0x046
			Motor voltage	0x06	?0x32
Condenser lens unit's amount of movement	0x07	?0x0F
			Number of magnetic poles	0x08	?0x0A
Rotation resolution	0x09	?0x08
			Focal length	0x0A	?0x0023
Maximum life cycle	0x0C	?0x0186A0
			The benchmark on-position	0x0F	?0x04
Subject is apart from ∞-focal position	0x10	?0x0198

Subject is apart from the 2m-focal position	0x12	?0x01BA
			Subject is apart from the 1m-focal position	0x14	?0x01D9
Subject is apart from the 0.5m-focal position	0x16	?0x0213
			Focal position correcting value based on temperature	0x18	?0x06
The focal position correcting value that causes based on the posture angle	0x19	?0x1F
			…	…	?…

As shown in table 1, canned data is formed on the information table of corresponding data on a plurality of each address in the nonvolatile memory 14.Also identical in this table 2,3 below.

In table 1, " exciting method " data of address 0x00 have 1 phase excitation (0x00), 2 phase excitations (0x01), 1-2 phase excitation (0x02) etc. under the situation of step motor, and table 1 illustrates the situation of 1-2 phase excitation (0x02).

" the peak response frequency " of address 0x01 is relevant with the maximum drive speed of motor, and the example of table 1 is represented the situation of 1-2 phase excitation, and data 0x0DAC is transformed to 10 system numbers, then represents 3500pps." the maximum self-starting frequency " of address 0x03 is also relevant with the maximum drive speed of motor, and the example of table 1 is represented the situation of 1-2 phase excitation, and data 0x2D0 is transformed to 10 system numbers, then represents 720pps.

About " motor current " of address 0x05, data 0x46 is transformed to 10 system numbers, then represent 70mA.About " motor voltage " of address 0x06, data 0x32 is transformed to 10 system numbers, then represent 50 * 10 ^-1 V.Control part 13 is set the voltage that applies of motor driving part 11 according to the information of this motor voltage to power supply 16.

About condenser lens unit's amount of movement of address 0x07, data 0x0F is transformed to 10 system numbers, then expression 15 μ m under the situation of 1-2 phase excitation.About the number of magnetic poles of address 0x08, data 0x0A is transformed to 10 system numbers, represent 10 utmost points, if 1 cycle of the drive signal of motor 9 is scaled the anglec of rotation, then be equivalent to 72 degree.As described below, the rotation resolution in 1 cycle of drive signal of motor 9 is 8 to cut apart, therefore, if the anglec of rotation that above-mentioned condenser lens unit amount of movement 15 μ m are scaled motor 9 then is equivalent to the 72/8=9 degree as can be known.

About the rotation resolution of address 0x09, data 0x08 is transformed to 10 system numbers, represent that then 8 cut apart, this is the rotation resolution that is equivalent to 1 cycle of drive signal of motor 9, if be scaled the anglec of rotation of motor 9, then is equivalent to above-mentioned 72/8=9 degree.

About the focal length of address 0x0A, data 0x0023 is transformed to 10 system numerical tables shows 35mm.Maximum life cycle about address 0x0C, data 0x0186A0 is transformed to 10 system numbers, then represented for 100000 cycles, for example represent the maximum life cycle the when situation of the reciprocal distance of the movable range of motor 9 rotary-focusing lens 4 considered as 1 cycle.The benchmark on-position of address 0x0F, the benchmark on-position of the motor 9 that carries out when being illustrated in the operation adjustment, this point is also record in the back.

The subject of address 0x10 apart from ∞-focal position is, with the position with the value representation of absolute position counter 153, the position of the condenser lens 4 of imaging apparatus 5 when the distance of subject is ∞.Address 0x12, address 0x14, address 0x16 be, with distance to subject be that the situation of ∞ is same, be the count value of distance from imaging apparatus 5 to the subject absolute position counter 153 when being 2m, 1m, 0.5m.

Each data representation is with the value of origin position as 0 absolute value counter 153.The subject of address 0x10 is apart from ∞-focal position, and 0x0198 is transformed to 10 system numbers becomes 408.The subject of address 0x12 is apart from the 2m-focal position, and 0x01BA is transformed to 10 system numbers becomes 442.The subject of address 0x14 apart from the 1m-focal position in, 0x01D9 is transformed to 10 system numbers becomes 473.The subject of address 0x16 is apart from the 0.5m-focal position, and 0x0213 is transformed to 10 system numbers becomes 531.

As mentioned above, the lens barrel 1 of present embodiment has had clearly the data of the relation of the anglec of rotation of motor 9 and subject distance in lens barrel 1.Preparing under the situation of multiple lens barrel 1 as changing lens, if storage is equivalent to the data of above-mentioned each data in each nonvolatile memory 14 of each lens barrel 1, then can control the condenser lens position irrespectively, accurately with the kind of lens barrel 1.

The value of address 0x18 based on the focal position correcting value absolute value counter 153 of temperature, the correcting value when expression changes 10 ℃, data 0x06 is transformed to 10 system numbers becomes 6.The focal position correcting value based on the posture angle of address 0x19 is the value of absolute value counter 153, the correcting value when expression changes 90 °, and data 0x1F is transformed to 10 system numbers becomes 31.The back will describe these corrections based on temperature, posture angle in detail.

Below table 2 expression read when being stored in common use in the information in the nonvolatile memory 14, camera head and the information of write activity (below, be called " storer writes/read information ").Though the data corresponding with each address of above-mentioned table 1 are to write in manufacturing process, read when using usually, the data corresponding with each address of table 2 are the data that read and write both when using usually.

At this, be to write data conditions with the most significant digit of 8 bit address for the situation of " 1 " to nonvolatile memory 14, most significant digit is a situation from nonvolatile memory 14 reading of data for the situation of " 0 ", below, illustrate to write address, address/read.

Table 2

Storer writes/reads information	The address	Data
			Life cycle	0x90/0x10	0x000010
…	…	…

In table 2, when the life cycle of address 0x90/0x10, the reciprocal distance of movable range that condenser lens 4 has for example been rotated motor 9 in expression as the life cycle in 1 cycle.

Be made as the focal position from initial point subject farthest during at benchmark apart from 0.5m with this 1 cycle, the focal position of this moment is that count value is 531 position as previously mentioned, promptly be 531 position, so reciprocal distance become 531 * 2=1062 from the distance of initial point.Therefore, counting under 1062 the situation, can be by on the life cycle of reading, adding 1 cycle, the life cycle of managing motor 9.

In this case,, before power-off, life cycle is written in the nonvolatile memory 14, thus, can upgrades up-to-date life cycle by data transmit-receive portion 18 and 17 in control part 13 management life cycles.

Below, the control information of transmitting-receiving between data transmit-receive portion 17 and 18 shown in the table 3.

Table 3

Control information	The address	Data
			The photoelectric sensor output level	0x20	?0x00
The motor on-position	0xA0	?0x04
			…	…	?…

In table 3, the photoelectric sensor output level of address 0x20 is the output level that is driven to the direction of imaging apparatus 5, is changed by shading member 7 shield light electric transducers 8 by condenser lens 4.The signal level of photoelectric sensor 8 changes, and when surpassing threshold value under rated condition when not reaching threshold value (or according to circuit structure), the data that are stored in the nonvolatile memory 14 for example are changed to 0x01 from 0x00.

The motor on-position of address 0xA0 is represented the on-position of motor 9, for example, and when 1 cycle of the drive signal of motor 9 is carried out 8 when cutting apart as 1-2 phase excitation, can enough 0x00,0x01 ... 8 values of 0x07 are represented.At this, the on-position of expression 0x04 is the output valve of on-position counter 151.

Then, the lens initialization action during energized under the common use pattern is described.Figure 36 is a lens initialization action process flow diagram.The action of the handling procedure in this flowcharting control part 13.In step 121, empty the internal storage of control part 13.In step 122, be received on the lens barrel 1 that memory storing reads information in the nonvolatile memory 14 that carries.

In step 123, the relatively affirmation of parity check bit that receives as described above and the parity check bit calculated by control part 13 judges whether each parity check bit is consistent.If consistent, then enter next step 124, if inconsistent, then enter step 123a.At step 123a, variable i (initial value is 0) added enter step 123b after 1, at step 123b, whether judgment variable i is more than pre-determined number (for example 3).Under the variable i situation littler than pre-determined number, return step 122, carry out same action.Reach in variable i under the situation of pre-determined number,, finish the lens initialization action as lens initialization failure.

In step 124, receive the storer that is stored in the nonvolatile memory 14 and write/read information.In step 125, the relatively affirmation of parity check bit that receives as described above and the parity check bit calculated by control part 13, and judge whether each parity check bit is consistent.If consistent, then enter step 126, if inconsistent, then enter step 125a.

At step 125a, variable k (initial value is 0) added enter step 125b after 1, at step 125b, whether judgment variable k is more than pre-determined number (for example 3).Under the variable situation littler than pre-determined number, return step 124, carry out same action.Reach at variable k under the situation of pre-determined number,, finish the lens initialization action as lens initialization failure.In step 126, focus on initial point and detect processing, finish the lens initialization action.

After the lens initialization action finishes, move usually according to the memory read that receives from nonvolatile memory 14 breath of winning the confidence, after release usually, storer writes/and the information of reading is updated to fresh information.

In addition, lens barrel 1 is being replaced with under the situation of new lens barrel 1, through above-mentioned step shown in Figure 36, control part 13 receives the information corresponding with new lens barrel 1.

Therefore, even under the situation of having changed lens barrel 1,,, carry out the position control of condenser lens 4 by the focus control portion 15 of camera body 19 according to the motor 9 that on the lens barrel after the replacing 1, carries and the operation condition of condenser lens 4.About being stored in each information of nonvolatile memory 14, identical with above-mentioned table 1-3 explanation, but make additional remarks below with reference to table 1～table 3.

By using the number of magnetic poles information of motor, the relation in 1 cycle of the anglec of rotation of motor and drive signal as can be known can be carried out the Spin Control of various motors.In addition, in the lens barrel that is equipped with the high motor of rotation resolving power (displacement resolving power),, can control the driving interval of condenser lens accurately in conjunction with motor by using the information of rotation resolution.8 examples of cutting apart have been shown in table 1, but also can be used for the 64 micro-stepping motors of cutting apart etc.

In addition, by using the information that applies voltage of motor, can set accordingly with various motors and driving circuit and apply voltage.In addition,, come corresponding various motors, focus on maximal rate control by adopting the information of maximum drive speed such as motor peak response frequency, maximum self-starting frequency.

In addition, as shown in table 2, as storer write/read information and have the information of life cycle, also it can be used as the information relevant with maintenances such as replacing periods of the motor 9 of lens barrel 2.For example,, can judge the replacing period of motor 9, therefore, also can be shown to the situation in the period of changing by comparing with the maximum life cycle information shown in the table 1.In addition,, be not limited to life cycle information, also can adopt the information of service time about safeguarding.

The benchmark on-position of the address 0x0F of the table 1 when then, illustrating that with reference to Figure 37 operation is adjusted.Figure 37 is that the initial point of the operation of one embodiment of the present invention when adjusting detects action specification figure." on-position " represented among Figure 37 is corresponding with the phase place of drive signal, will carry out 8 from 1 cycles 360 degree that motor driving part 11 outputs to the motor coil drive signal of motor 9 and cut apart, and shows as 3 count values of on-position counter 151.

The count value of on-position counter 151 sends to motor driving part 11 through data transmit-receive portion 18 and 17.At this, expression along with condenser lens 4 to imaging apparatus 5 side shiftings, on-position subtracts 1 situation at every turn, by transmitting the motor on-position as address 0xA0 (table 3), the rotation of control motor 9.

" A phase current " and " B phase current " is the current waveform that outputs to the motor coil of motor 9 from motor driving part 11, and expression motor 9 has the example of A phase and B two phase coils mutually.The electric angle of A phase current and B phase current (1 cycle of current waveform is made as 360 when spending) differs 90 degree phase places, by A is applied electric current with B motor coil mutually mutually, motor 9 is rotated.At this,, make condenser lens 4 to imaging apparatus 5 side shiftings with the condition of A phase current than the leading 90 degree phase places of B phase current.

The count value of " absolute position counter " expression absolute position counter 153 with the on-position synchronization action, subtracts at 1 o'clock at on-position at every turn, and the absolute position counter subtracts 1 too at every turn.Wherein, the absolute position counter is set at bit wide, does not have identical value in the moving range of condenser lens 4.

" photoelectric sensor output level " expression is moved and by shading member 7 shield light electric transducers 8 to the direction of imaging apparatus 5 by condenser lens 4, the situation that output level is changed.At " photoelectric sensor output level " being, is " 1 " when threshold value is above, is when not reaching threshold value " 0 ", in the data of control part 13 by data transmit-receive portion 17 and 18 identification address 0x20 (table 3).

The initial point of the condenser lens 4 when then, specifying the operation adjustment with reference to Figure 37, Figure 38 detects action.Figure 38 is that the initial point of one embodiment of the present invention detects action flow chart, and expression is programmed in the motion flow in the control part 13.In the operation adjustment modes, during energized, handle from " initial point detects and adjusts ".

In step 221, motor 9 is moved length by length to (imaging apparatus 5 directions) to the initial point detection side.At this moment, on-position counter 151 subtracts 1 at every turn.More specifically, according to instruction, make on-position counter 151 carry out countdown from control part 13.According to this countdown output periodic drive signal is arranged at motor driving part 11,, come mobile focusing lens 4 by making the direction rotation of motor 9 to imaging apparatus 5.

In step 222, judge whether the photoelectric sensor output level surpasses threshold value.When not surpassing, return step 221, make motor 9 carry out the next one 1 step action.When surpassing, enter step 203, will be above on-position substitution P constantly.At this, with on-position " 4 " substitution P.

In step 224, store P into nonvolatile memory as Po.At the Po of this storage is the benchmark on-position of motor 9, by data transmit-receive portion 18 and data transmit-receive portion 17, stores in the nonvolatile memory 14 as address 0x0F, data 0x04.In step 225, with the absolute position counter reset.In Fig. 5, the position of representing with " 0 " becomes the position that is reset.

When cutting off the electricity supply, the position of " 0 " of this absolute position counter is eliminated, and therefore, when the power connection of common use pattern, need detect origin position once more.In the detection of this origin position, use the information that is stored in the benchmark on-position " 4 " in the nonvolatile memory 14.On-position " 4 " is not the absolute position, but therefore the position of periodically reproducing, if detect the on-position corresponding with initial point " 4 ", then can detect origin position.

Particularly, in common use pattern, by signal from motor control part 15, make motor 9 to the initial point detection side to rotation.At this moment, leave the on-position " 0 " of electric angle 180 degree (1/2 cycle) of motor 9, judge whether the photoelectric sensor output level has surpassed threshold value at the benchmark on-position " 4 " that receives from nonvolatile memory 14.Judge that the photoelectric sensor output level of position reset surpasses threshold value if detect the next one that certain photoelectric sensor output level of judging the position reset is no more than threshold value and 1 all after dates, the origin position in the time of then can correctly reproducing operation and adjust.That is, judge that at two the on-position " 4 " between the reset of position becomes origin position.

This initial point detects to handle does not need directly to detect origin position, as previously mentioned, to judge that the photoelectric sensor output level of position reset surpasses threshold value just passable as long as can detect the next one that certain photoelectric sensor output level of judging the position reset is no more than threshold value and 1 all after dates.Therefore, even produced under the situation of error of the gap of the driving direction of lens unit, mechanism that the environment for use temperature variation causes and electrical characteristics deviation etc., the origin position in the time of also can correctly reproducing operation and adjust.

The error span of the gap of lens unit driving direction, mechanism that the environment for use temperature variation causes and electrical characteristics deviation etc. need be limited in the on-position scope in 1 cycle.

Then, to having used the control method that is stored in the nonvolatile memory 14 to describe based on the condenser lens 4 of the focal position correcting value of temperature.Figure 39 is the chart of the relation between expression temperature and the focal position correcting value.The data of address 0x18 in the table 1 are 0x06, and during 10 ℃ of temperature variation, the count value of absolute position counter 153 changes 6.This example is to rise along with temperature and move the example of proofreading and correct to the direction (distally) near imaging apparatus 5 in the position that makes condenser lens 4, can in order to 20 ℃ for benchmark have-0.6 count value/℃ the bar chart at inclination angle represent.

As shown in figure 34, control part 13 receptions are from the information of temperature sensor 20.In control part 13, according to temperature variation that detects with temperature sensor 20 and the data 0x16 of address 0x18,, proofread and correct the position of condenser lens 4 according to the chart of front, thus,, also can guarantee focusing state even under the situation that has produced temperature variation.

For example, temperature in use is that the focal position of condenser lens 4 is not corrected under 20 ℃ the situation of reference temperature.On the other hand, when becoming than high 10 ℃ 30 ℃ of reference temperature, the focal position is corrected as count value and changes 6 position to the direction near imaging apparatus 5.

Then, to having adopted the control method that is stored in the nonvolatile memory 14 to describe based on the condenser lens 4 of the focal position correcting value of posture angle.The relation of posture angle and angular transducer output voltage as shown in figure 17.The data of address 0x19 in the table 1 are 0x1F, change in the posture angle under the situation of 90 degree, and the count value of absolute position counter 153 changes 31.

At this, in fixed lens 2 direction up, the angular transducer output voltage becomes+, in fixed lens 2 direction down, the angular transducer output voltage becomes-.For example, 90 when spending up, because the gap of system of mechanism, condenser lens 4 makes the count value of absolute value counter 153 change 31 on the direction near imaging apparatus 5,90 when spending down, because the gap of system of mechanism, condenser lens 4 make the count value of absolute value counter 153 change 31 on the direction away from imaging apparatus 5.

As shown in figure 34, control part 13 receptions are from the information of angular transducer 21.At this moment, for example up 90 when spending, control part 13 is according to the data 0x1F by angular transducer 21 detected angular transformations and address 0x19, with the position of condenser lens 4 to correction for direction count value 31 away from imaging apparatus 5.On the other hand, 90 when spending down, with the position of condenser lens 4 to correction for direction count value 31 near imaging apparatus 5.Thus, even under the situation that has produced big posture angle variation, also can guarantee focusing state.

Have again, during with respect to level, under the different situation of the deviation of direction up and direction focusing lens position 4 down, also can have respectively as the win the confidence zone of breath storage of memory read.

In addition, show the example of serviceability temperature sensor and angular transducer, but also can use humidity sensor at this.According to this structure, can improve the error that the hygroscopic coefficient difference because of lens barrel and lens etc. produces, can improve precision.

In addition, in the present embodiment, the example of step motor has been described as driving mechanism, but so long as the drive signal of motor have periodically just passable, linear motor etc. for example.

In addition, by the circuit that detects the motor amount of movement is set, according to the position on-position counter of present embodiment is increased progressively counting or countdown, give periodicity to drive signal simulation ground thus, in the various motors such as the motor that the present invention can be applicable to ultrasonic motor thus, constitute by the smooth impact driving mechanism, electrostatic motor, piezo-electric motor.

In addition, in the present embodiment, mainly illustrated to drive the motor of condenser lens, but also the present invention can be applicable in the camera head and lens barrel with the motor that drives zoom lens.

(the 13 embodiment)

Figure 40 is the block scheme of the camera head in the 13 embodiment.Among Figure 40, the 30th, lens barrel, the 38th, imaging apparatus, the 27th, the 1st lens unit that can be provided with movably in lens barrel 30 is a Zoom lens unit.The 2nd lens units that 29 be arranged in the lens barrel 30, can move by guidepost described later are the condenser lens unit.

The 22nd, by mobile reception and registration portion 28 with Zoom lens unit 27 the 1st driving mechanisms that on optical axis direction, drive, that for example constitute by step motor etc.The 23rd, be used to drive the 1st driving mechanism of step motor 35, this step motor 35 is used for condenser lens unit 29 is driven on optical axis direction.The 36th, cooperate with the screw of step motor 35 and be provided with the limiting member (movement limiting portion) of screw thread, move on optical axis direction along with the rotation of step motor 35.

The 34th, condenser lens unit 29 is pushed to Zoom lens unit 27 sides, is the spring of object side, when the common use of camera head, the lens frame 29a of condenser lens unit 29 be subjected to spring 34 acting force and with limiting member 36 butts, be limited the position and keep.

32, the 33rd, the guidepost that guided focused lens unit 29 moves along optical axis direction.The 28th, mobile transfer part is located on the Zoom lens unit 27, with this Zoom lens unit 27 when shooting face direction moves, with the lens frame 29a butt of condenser lens unit 29.

31 are provided in a side of the shading member on the condenser lens unit 29.By condenser lens unit 29 is moved to shooting face direction, shading member 31 covers the light of the transmittance type photoelectric sensor 37 installed on the lens barrel 30 (below be called photoelectric sensor), thus, detects the position of condenser lens unit 29.

The 24th, according to the output signal of photoelectric sensor 37, the pattern of camera head main body, to the control gear of the 1st driving mechanism 22 and the 2nd driving mechanism 23 output control signals.The 26th, the storer of the pattern information of storage control gear 24, the 25th, handle from the signal processing mechanism of the image information signal of imaging apparatus 38 outputs.In addition, the storer 26 as storing mechanism constitutes by nonvolatile memory or with the volatile memory that secondary power (not shown) drives.

39 are provided in a side of for example internal electric source in the camera head, the 40th, the external power source that is connected with splicing ear 41.By these power supplys, as if energized switch 42 when the shooting action waits beginning, then to supply powers such as control gear 24, signal processing mechanisms 25.Have, for example when internal electric source 39 uses up etc., the use in generation is supplied with from the power supply of external power source 40 again.

The 43rd, be connected the end switch on the control gear 24, wait in the shooting action to disconnect "on" position when finishing.Under the on-state of power switch 42, if this end switch 43 of operation then after the predefined processing action when control device 24 has carried out power supply supply disconnection, by control gear 24 disconnecting power switch, becomes power down state.

At this, the photoelectric sensor 37 that constitutes above-mentioned position detecting mechanism has " コ " font main body that is installed on the lens barrel 30, in the sheet portion of a side of this main body and each inboard of another side band part, light-emitting component and photo detector opposed with it is installed.When condenser lens unit 29 during to the imaging apparatus side shifting, shading member 31 enters between light-emitting component and the photo detector, block from the light of the light-emitting component directive photo detector of the direction of the light shaft positive cross of each lens unit.

Figure 41 is the mode shifts key diagram of above-mentioned each lens unit.The position of the Zoom lens unit 27 among Figure 40 and each pattern of condenser lens unit 29 is divided into Figure 41 (a)～Figure 41 (d) and illustrates.

In addition, control gear 24 is made of microcomputer, not only each above-mentioned action is controlled, and the everything at the embodiment of this explanation is controlled.

Figure 42 is the processing action flow chart of the control gear 24 during by power switch 42 supply powers (connection).Figure 42 is an explanation camera head when finishing last action, during normal termination and the motion flow during abnormal ending.The situation of abnormal ending is meant that under the state of camera head supply power, for example under the state of external power source 40 supply powers, splicing ear 41 comes off accidentally, the unexpected situation about disconnecting of its power supply.

In storer shown in Figure 40 26, during processing to the camera head supply power time, as described later, the abnormal ending mark is set by control gear 24.When the power supply of camera head normally disconnects, two lens units 27,29 move, the light crested member 31 of photoelectric sensor 37 covers, and, two lens units 27,29 move to reception position, when these situation Be Controlled mechanisms 24 detect,, remove the abnormal ending mark by instruction from this control gear 24.

When the action of camera head there is not normal termination, for example under the state of supply power, disconnect suddenly its power supply etc. and do not have under the situation of normal termination, the light of photoelectric sensor 37 is not blocked, and two lens units 27,28 are not received into reception position.Under this situation, the abnormal ending mark that is stored in the storer 26 is not eliminated.Therefore, this abnormal ending mark is managed as each lens unit is not received into the state of final reception position in lens barrel mark.

As shown in figure 42, when the power supply of camera head was supplied with, control gear 24 began to carry out from the action that has or not of the abnormal ending mark that reads storer 26.Judgement is to carry out the processing when supplying with of power supply when common, still carries out the processing of (when the power supply after the abnormal ending is supplied with) when supplying with of power supply when unusual, after the differentiating and processing, carries out the processing of power supply when supplying with.Thus, even under the situation that camera head finishes with abnomal condition during the release of last time, when supplying with the power supply of camera head, the initial point that can carry out lens unit detects to handle and returns to normal condition next time.

When supplying with, handles the power supply when Figure 43 is based on from the instruction of control gear 24 common action flow chart, the processing flow chart when power supply when Figure 44 is based on from the instruction of control gear 24 unusual is supplied with.In Figure 42,, enter the some processing in these actions with after the action of flowcharting.In addition, in the process flow diagram in Figure 43 and Figure 44, abbreviate Zoom lens unit as " zoom ", abbreviate the condenser lens unit as " focusing ".In addition, this abbreviation is identical in the accompanying drawing of back.

At first, to finishing that camera head is described with common regular event end, the situation that camera head is moved specifically.Before supply power, owing to last time be tenth skill normally, therefore, shown in Figure 41 (a), Zoom lens unit 27 and condenser lens unit 29 are in the state (normal termination) of the shooting face of being received to side.

Under this state, when power switch 42 is connected and during to control gear 24 supply powers such as grade, the processing when the power supply of Figure 42 is supplied with begins to move.In step 131, the abnormal ending mark in control gear 24 readout memories 26.Under the situation of last time normal termination, in order to make the abnormal ending mark in the storer 26 become removing (N) state, and enter step 131a.

At this step 131a, control gear 24 is provided with after the abnormal ending mark in storer 26, begins the processing action when supplying with of power supply when common.That is, continue to be provided with the state of abnormal ending mark afterwards, the abnormal ending mark is eliminated under the situation of normal termination, under the situation of abnormal ending, keeps the state that is provided with the abnormal ending mark.

On the other hand, when supply power, the abnormal ending mark is set under the situation in the storer 26, enters step 131b, after this step 131b resets the abnormal ending mark, begins power supply when unusual and supplies with and handle action.

With Figure 43 explanation in processing during normal termination, when the common power supply of step 131 is supplied with of last time moving of camera head.In the step 231 of Figure 43,, make Zoom lens unit 27 stretch out action to object side by drive the driving of the 1st driving mechanism 22 based on instruction from control gear 24.

By the action of stretching out of Zoom lens unit 27, in step 232, photoelectric sensor 37 has judged whether transmission from the light of its light-emitting component to photo detector.Under the situation of transmitted light not, enter step 231 once more.Afterwards, shown in Figure 41 (b), it is mobile to follow stretching out of Zoom lens unit 27, and condenser lens unit 29 is subjected to the acting force of spring 24 and moves.Thereupon, shading member 31 moves, and changes (origin position) from the shielding status of the light of photoelectric sensor 37 to transmissive state, enters next step 233.In this step 233, carry out zoom initial point reset processing.

Have, the initial point reset processing of this Zoom lens unit 27 is to detect driving by the 1st driving mechanism 22 by control gear 24 to make the shielding status of the light of photoelectric sensor 37 be changed to transmissive state to carry out again.

At this, the step motor (not shown) that 1-2 phase excitation is driven with the 1st driving mechanism 22 is as the structure of power source, illustrates that above-mentioned origin position detects to handle.At this moment, the driving of step motor is generally supplied with by A phase current and B phase current, and thus, shown in the on-position of Figure 46, step motor makes zoom lens 27 move to stretching out direction with the interval of electric angle 45 degree.

Control gear 24 monitors the transmittance of the photoelectric sensor 37 that mobile shading member 31 forms by following moving of this Zoom lens unit 27 by the output level of photoelectric sensor 37.In the moment of output level above pre-set threshold, make the absolute position counter reset, detect the origin position of Zoom lens unit 27.

After above-mentioned steps 233 is carried out zoom initial point reset processing,, by the 1st driving mechanism 22 Zoom lens unit 27 is for example stretched out and to move to the position of dolly-out,ing dolly-back in step 234.With stretching out of Zoom lens unit 27 mobile the time, condenser lens unit 29 is moved to equidirectional by spring 34.

Afterwards, two lens units 27,29 move to the position shown in Figure 41 (b) from Figure 41 (a), in the position shown in this Figure 41 (b), and the lens frame 29a of condenser lens unit 29 and limiting member 36 butts.Afterwards, Zoom lens unit 27 and condenser lens unit 29 separate, and shown in Figure 41 (c), Zoom lens unit 27 is extended the position of dolly-out,ing dolly-back.

Afterwards, shown in step 235, drive step motor 35,, condenser lens unit 29 is moved to the distally by limiting member 36 being moved to shooting face side (distally) by the 2nd driving mechanism 23.To the moving of shooting face side, in step 236, control gear 24 detects the variation of photoelectric sensor 37 from the transmittance state to shielding status based on shading member 31 by condenser lens unit 29.

When the state that becomes shown in Figure 41 (b), enter next step 237.Up to by condenser lens unit 29 to the moving of shooting face side, till the light crested of photoelectric sensor 37, repeating step 235 and step 236.After entering step 237, by control gear 24, the 2 driving mechanisms 23 condenser lens unit 29 is moved to object side (nearside), enter step 238.

In step 238, judge by condenser lens unit 29 that to the moving of object side whether photoelectric sensor 37 is changed to transmissive state from the shielding status of light, if become the transmittance state, then enter next step 239, detect the focusing origin position, focus on initial point and reset at this.

The initial point of this condenser lens unit 29 resets, be to detect because the driving of the 2nd driving mechanism 23 makes the shielding status of the light of photoelectric sensor 37 become transmissive state and carries out by control gear 24, to make the shielding status of the light of photoelectric sensor 37 become the situation of Zoom lens unit 27 of transmissive state different with driving by the 1st driving mechanism 22 for these.By condenser lens unit 29 to the moving of object side, till the transmittance of photoelectric sensor 37, the processing of repeating step 237 and step 238.

Then, the initial point that condenser lens unit 29 is described detects processing.Figure 46 is that the initial point of lens unit detects action specification figure.This illustrates following example: supply with A phase current and B phase current from driving mechanism 23 to the step motor 35 that 1-2 phase excitation drives, shown in on-position 0-7, each step drives 45 degree electric angles, and condenser lens unit 29 is driven to the subject direction.

Monitor the output level of photoelectric sensors 37 by control gear 24,, detect the origin position of condenser lens unit 29 by the moment that surpasses pre-set threshold at this output level absolute position counter that resets, and the processing when finishing power supply thus and supplying with.

After the processing when finishing above-mentioned power supply and supply with, control control gear 24, thereby drive two lens units 27,29 action of photographing according to the user's of camera head operation.

Action when this power supply such as for example is cut off accidentally at abnormal ending then, is described under the state that the camera head power supply is provided when last time using.As the state of the lens unit under the situation of abnormal ending when last time using, can obtain a certain state of Figure 41 (a) to the state shown in Figure 41 (d).

Figure 41 (a) represents the state that each lens unit 27,29 is normally taken in, but, take in before action finishes fully at this, because of power supply for example is forced to disconnect etc., the abnormal ending mark of storer 26 is not eliminated and still is in the situation about finishing with abnormality of the state of setting.The situation of the state that (for example in the photography) power supply is disconnected in the common use of Figure 41 (d) expression camera head.

Whether the state of Figure 41 (a) and Figure 41 (d) all is states that the light crested member of photoelectric sensor 37 covers, therefore, only during supply power, can not distinguish under a certain state when last time using by abnormal ending under the state of photoelectric sensor 37.

In addition, Figure 41 (b) is illustrated in and stretches out Zoom lens unit 27 in the process or contraction process breaks the state state of the lens frame 29a butt of condenser lens unit 29 (the mobile transfer part 28 with) of power supply.Figure 41 (c) is illustrated in the state of (for example in the photography) deenergization in the common use.The state of Figure 41 (b) and Figure 41 (c) all is the light transmissive state of photoelectric sensor 37, therefore, under this two states also during supply power, can not distinguish under certain state when last time using whether abnormal ending.

Therefore, in the present embodiment, when supply power, read the abnormal ending mark of storer 26, when in storer 26, being provided with the abnormal ending mark, at first carry out " processing the when power supply of time is supplied with unusually ", carry out " processing the when power supply of time is supplied with usually " afterwards.On the other hand, under the situation that the abnormality processing mark is eliminated, as previously mentioned, carry out " processing the when power supply of time is supplied with usually ".

By above-mentioned setting, can be not processing when common just camera head can be returned to the state of making a video recording at once, by in abnormal ending state under, insert the processing when unusual before the processing usually the time, can return to steady state (SS) from abnormality thus.

Use Figure 44 explanation processing of (during connection) during by power switch 42 supply powers such as grade under the state of abnormal ending.In step 331, control device 24 judges whether that light-emitting component from photoelectric sensor 37 is to the photo detector transmitted light.Be under the situation of light transmission state at the photoelectric sensor 37 shown in Figure 41 (b) and Figure 41 (c), enter step 336.In step 336, by the 1st driving mechanism 22 Zoom lens unit 27 is moved to shooting face side (distally) and carry out contractive action.

Under the situation shown in Figure 41 (a) and Figure 41 (d), enter step 332, drive unit structure 22 by the 1st and carry out the action of stretching out of Zoom lens unit 27 by the light of shading member 31 shading light electric transducers 37.When action of stretching out of carrying out Zoom lens unit 27, in step 333, whether control gear 24 detects photoelectric sensors 37 and is in from the transmittance state of light-emitting component to photo detector.Make under the situation of not transmission of light of photoelectric sensor 37 in the action of stretching out, enter step 333a, judge Zoom lens unit 27 the mobile of ormal weight (Y1+ α) distance that whether be through with at this by Zoom lens unit 27.

At this, the reception position of contraction state of Zoom lens unit 27 and the relation of origin position (transferring to the position of transmissive state from the light shielding status of photoelectric sensor 37) are described.Taking in the action when the contraction of Zoom lens unit 27, condenser lens unit 29 also moves to equidirectional.Along with moving of condenser lens unit 29, shading member 31 also moves, and at origin position, the light of photoelectric sensor 37 is transferred to shielding status from transmissive state.

The reception position of Zoom lens unit 27 is set at the position of further indentation, and according to the umber of pulse of step motor, for example the distance and position that moves to shrinkage direction with 2 pulses is a reception position.Therefore, from stretching out of the Zoom lens unit 27 of reception position moved, the light of photoelectric sensor 37 arrives the origin position of transferring to transmissive state from shielding status during the 3rd pulse.

The reception position by constituting Zoom lens unit 27 as mentioned above and the relation of origin position, establishing above-mentioned Y1 is (origin position)-(reception position), α is the umber of pulse of step motor, for example is set at the distance that moves with 1 pulse.Thus, in step 333a, by after the origin position, control gear 24 has judged whether to finish the moving of 1 umber of pulse of step motor at Zoom lens unit 27.This judgement is whether judgement has finished moving of (Y1+ α) from the starting position of stretching out action of Zoom lens unit 27.At step 333a, when control gear 24 detects moving of (Y1+ α) and finished, enter step 334.

From the transfer of step 333a to step 334, moved (Y1+ α) with Zoom lens unit 27 irrelevant, still is the situation that photoelectric sensor 31 is in shielding status.Be limited condenser lens unit 29 shown in Figure 41 (d) mobile to be in above-mentioned state under the situation of member 36 restrictions.

In step 334, condenser lens unit 29 is moved to object side (nearside) by the 2nd driving mechanism 23.Thus, when detecting in step 335 that shading member 31 also moves and photoelectric sensor 37 when being in the state of transmitted light stops the mobile of condenser lens unit 29, enter step 336.In this step 336, make 22 actions of the 1st driving mechanism, the contractive action of beginning Zoom lens unit 27.

Zoom lens unit 27 in step 336 in the contractive action of shooting face side, step 337 be judged as photoelectric sensor 37 be in light transmission state during, continue contractive action.When the light crested member 31 of photoelectric sensor 37 blocks and detects origin position, enter step 338.

In step 338, when detecting the mobile end of afore mentioned rules amount Y1 distance, finish to handle when power supply when unusual is supplied with.Under this state, Zoom lens unit 27 arrives the reception position shown in Figure 41 (a).Afterwards, then transfer to when common power supply shown in Figure 43 is supplied with and handle, carry out the setting of the state of can making a video recording.Have, in the transfer of handling when this common power supply is supplied with, the abnormal ending mark that is provided with again in storer 26 keeps original state again.Afterwards, continue to be provided with the state of abnormal ending mark, under the situation of normal termination, the abnormal ending mark is eliminated, and under the situation of abnormal ending, keeps the state that the abnormal ending mark is set up.

As mentioned above, according to present embodiment, even camera head when last time using by the situation of abnormal ending under, also can recover the state of its abnormal ending and transfer to and handle when power supply is supplied with normally usually.

Below, with Figure 45 common end such as camera operation being described, the user is the processing during deenergization normally.When cutting off the end operation of "on" position with end switch 43, at first, in step 431, control gear 24 judge photoelectric sensor 37 whether from this light-emitting component to the photo detector transmitted light.

Because of shading member light time of transmitted light electric transducer 37 not, enter step 431a.At step 431a, by the 2nd driving mechanism 23 condenser lens unit 29 is moved to object side, enter step 431b.At step 431b, to the moving of object side, judge whether the light of transmitted light electric transducer 37 by control gear 24 by condenser lens unit 29.When detecting the state of transmitted light by moving of shading member 31, stop to move of condenser lens unit 29, enter next step 432.

In step 432, the driving by the 1st driving mechanism 22 to shooting face side shifting, is carried out contractive action with Zoom lens unit 27.To the moving of shooting face side, condenser lens unit 29 is also to shooting face side shifting by this Zoom lens unit 27.Afterwards, judge whether the light of transmitted light electric transducer 37 in step 433.Under the situation of transmitted light, return step 432 and continue contractive action, when detecting optical transmission and be blocked, enter step 434.

The moment that the light of photoelectric sensor 37 is blocked is an origin position, by Zoom lens unit 27 mobile focusing lens unit 29, arrives reception position from this origin position mobile afore mentioned rules amount Y1.Judge whether that in step 434 contractive action is up to this reception position and end.When in step 434, contractive action is imperfect tense returned step 432 and is continued contractive action, and Zoom lens unit 27 is moved to the reception position shown in Figure 41 (a) reliably.

By step 434, detecting that Zoom lens unit 27 arrives from the position that origin position has moved ormal weight Y1 is reception position and when being through with contractive action, remove the abnormal ending mark of storer 26 in step 435, and, control gear 24 cuts off "on" position with disconnecting power switch 34, the processing when promptly finishing dump.

And, apply 2 pulses to the step motor that constitutes the 1st driving mechanism 22 from the moment of the origin position that detects Zoom lens unit 27, and after mobile ormal weight Y1, apply 1 pulse to step motor again, by this 1 end that pulse applies, can detect the contractive action that Zoom lens unit 27 moves to reception position and finish.

More than, present embodiment has been described, the feature of summarizing present embodiment is as follows.Action was at first to read the abnormal ending mark by control module 24 from storer 26, and confirm that this mark is eliminated when the power supply in the time of was usually supplied with.Confirm that at this each lens unit is positioned at the state of Figure 41 (a) constantly, judge to be in thus and take in done state.

Then, begin to carry out the action of stretching out of Zoom lens unit 27 from the state of Figure 41 (a) by the 1st driving mechanism 22, the condenser lens unit 29 that is contained by this Zoom lens unit 27, the restoring force by spring 34 stretches out with this Zoom lens unit 27.Thus, shading member 31 also moves, so the state of photoelectric sensor 37 from the state variation of the light that is blocked to transmitted light, detects the change point from this shading light state to the transmitted light state, and the initial point that carries out Zoom lens unit 27 resets.

Then, Zoom lens unit 27 is moved further and reaches assigned position, under the state of the lens frame 29a separation of condenser lens unit 29,, condenser lens unit 29 is moved in mobile transfer part 28 shown in Figure 41 (c) to imaging apparatus 38 directions by driving step motor 35.

Afterwards, after by shading member 31 temporary transient shield light electric transducers 37, reverse drive step motor 35, the acting force by spring 34 makes condenser lens unit 29 move to the subject direction.Thus, detect the change point of the shielding status of the photoelectric sensor 38 that causes from shading member 31 to the state variation of transmitted light, the initial point that carries out condenser lens unit 29 by this detection resets.When the power supply usually the time was supplied with, by carrying out above action, the initial point that is carried out each lens unit by 1 photoelectric sensor 37 detected.

Then, when last time using, supplied with under the state of power supply of camera head, from this power supply for example by cut-outs accidentally wait abnormal ending the action of state (abnormal ending state) when beginning supply power as described below.At first, read the abnormal ending mark by control module 24 from storer 26, if this abnormal ending mark is set, then judging is that dump does not normally carry out and the unclosed state (abnormal ending state) of taking in of lens unit.

Then, in the moment of having confirmed this abnormal ending mark, do not know each lens unit is arranged in which state of the (a) and (b) of Figure 41, (c), (d).In addition, under the uncompleted state of taking in of lens unit, during the light crested of focus sensor 37, unclear is driving by 22 pairs of Zoom lens units 27 of the 1st driving mechanism, these photoelectric sensor 37 crested members 31 are covered, still these photoelectric sensor 37 crested members 31 are covered by condenser lens unit 29.

Therefore,, where be positioned at, judge that at first the state that only is in transmission of photoelectric sensor 37 still is in the state of not transmission for each lens unit in order when common power supply is supplied with, to handle from the abnormal ending state transitions.Under the state of transmission, make Zoom lens unit 27 carry out contractive action, the light crested member 31 of photoelectric sensor 37 covers, thus, moving of the Zoom lens unit 27 that is undertaken by the 1st driving mechanism 22, distinguish the light crested of photoelectric sensor 37, and transfer to when common power supply is supplied with and handle.

On the other hand, under the state of the not transmission of light of photoelectric sensor 37, Zoom lens unit 27 is stretched out ormal weight by the 1st driving mechanism 22.If the light of photoelectric sensor 37 carries out transmission by this action, when then distinguishing abnormal ending, by moving of the Zoom lens unit 27 that undertaken by the 1st driving mechanism 22, the light of photoelectric sensor 37 is blocked.Therefore, at this moment, after stretching out Zoom lens unit 27, carry out the light that contractive action is come shading light electric transducer 37, thus, can be transferred to when common power supply is supplied with and handle.

Have again, if Zoom lens unit 27 is stretched out ormal weight, the also not transmission of light of photoelectric sensor 37, then in order to make condenser lens unit 29 not because of the restoring force of spring 34 moves, the light that is estimated as photoelectric sensor 37 crested member 31 covers.Therefore, utilize the 2nd driving mechanism 23 that condenser lens unit 29 is moved to the subject direction, after the transmittance of confirming photoelectric sensor 37, make Zoom lens unit 27 do contractive action by the 1st driving mechanism 22, handle when thus, transferring to common power supply supply.

Action when then, cutting off the dump of "on" position is as described below.For example, the state that covers when the shading member 31 that is not focused lens unit 29 from light by photoelectric sensor 37 shown in Figure 41 (c), when carrying out the contractive action of Zoom lens unit 27 by the driving of the 1st driving mechanism 22, the mobile transfer part 28 of Zoom lens unit 27 and the lens frame 29a butt of condenser lens unit 29.Thus, condenser lens unit 29 also becomes one and overcomes spring 34 and moves to shooting face side, makes photoelectric sensor 37 become shielding status from the state of transmitted light by shading member 31.Finish after the contractive action by the detection of this state variation, take in each lens unit.

In addition, shown in Figure 41 (d), covered at shading member 31 under the situation of the dump operation that finishes to switch under the state of light of photoelectric sensor 37 by condenser lens unit 29, at first drive step motor 35, the acting force by spring 34 makes condenser lens unit 29 move to object side.

Thus, make photoelectric sensor 37 temporarily be in the state of transmitted light, detection according to the state variation of photoelectric sensor 37, photoelectric sensor 37 begins to drive the 1st driving mechanism 22 from the state of transmitted light, carry out contractive action by Zoom lens unit 27, thus each lens unit is received into reception position.

Afterwards, when these each lens units moved to reception position and finish contractive action, energising was cut off.As mentioned above, by carrying out above action when the dump, the initial point that can carry out each lens unit when supply power next time detects.

According to above-described present embodiment, can carry out the detection of the origin position of the 1st lens unit (Zoom lens unit) and the 2nd lens unit (condenser lens unit) with the common position detecting mechanism of 1 sensor formation.That is, the initial point that position detecting mechanism not only carries out the 2nd lens unit detect to detect, and the butt by the 1st lens unit and the 2nd lens unit moves, and can also detect the origin position of the 1st lens unit.Thus, can reduce the number of components, and, can realize the optical axis direction of lens barrel and the miniaturization of peripheral direction.

In addition, for example, splicing ear is connected to from the outside on the camera head to the camera head supply power, and wait under the situation about stopping with up-set condition such as cut off the electricity supply suddenly by extracting this splicing ear, when connecting the power supply of camera head next time, can normally carry out origin position and detect processing, can return to normal condition.

An example as the embodiment of above explanation, in for example following method except that structure described below other structures identical, promptly, this method has storing mechanism, this storing mechanism is according at the abnormal ending state that makes the 1st lens unit and the 2nd lens unit move to the normal termination state of reception position and finish with the state different with above-mentioned normal termination state under the power supply supply condition according to predefined processing action when the power supply supply condition is cut off the electricity supply, storage part with information; Under the abnormal ending state, be stored in information in the storing mechanism according to supply by power supply, make above-mentioned the 1st lens unit and the 2nd lens unit return to above-mentioned normal termination state.

In addition, when energized under the abnormal ending state, only finish, can under this state, stop, at this moment,, carry out handling when common power supply is supplied with by supply power once more by returning to the normal termination state.

In addition; when using secondary power with power supply as storing mechanism; under the situation that its storing mechanism is made of volatile storage; when secondary power reduces, the loss abend message, but in this case; can reduce by the detection power supply and be judged as just in abnormal ending; thus, can not cause misoperation, can normally recover.

In addition, by being used for moving the mobile transfer part and the movement limiting portion (present embodiment is mobile transfer part 28 and limiting member 36) of control the 2nd lens unit, on the lens frame of the 2nd lens unit at mutual close position butt, make the position that is necessary to strengthen the lens frame of intensity because of their butts become small size, and, guarantee that the part of the surface accuracy of its interface also becomes little position.Therefore, carry out stable action, and, by making the butt position on this lens frame close with the supporting member that the 2nd lens unit is supported movably (being guidepost 32,33 in the present embodiment), thereby, even on the 2nd lens unit, apply butt power, can substantial bending not take place to it, moving of the 2nd lens unit carried out sleekly.In addition, supporting member is not limited to two, also can be provided with more.

In addition, in the present embodiment, illustrated the example of step motor as the driving mechanism that drives the 1st lens unit (Zoom lens unit) and the 2nd lens unit (condenser lens unit), but these driving mechanism also can use DC motor, ultrasonic motor etc., does not limit driven mechanism.In addition, also can be the motor of band scrambler, also can be the motor of not being with scrambler.

And, lens unit is moved to the ormal weight Y1 of reception position through origin position, for example can be based on the distance of the time that timer sets, in addition, also can be based on the ormal weight of other settings.

In addition, in the present embodiment, after lens unit moves to reception position, step motor is applied 1 pulse, but also can apply more pulse, and, after moving to reception position, also can not apply pulse.

Have again, in the present embodiment, illustrated transmission-type photoelectric sensor and shading member (detected member) are used as the example that origin position detects the position detecting mechanism of usefulness, still, also can use reflective photoelectric sensor and reflecting member.In addition, also can use Hall element and magnet.

Moreover, the detection of the origin position of the 1st lens unit, be not limited to as present embodiment ground, make directly be installed on the 1st lens unit or form the mobile transfer part of one with the 1st lens unit, the mobile transfer part that promptly moves with the 1st lens unit one is come with the 2nd lens unit butt and carry out.Particularly, also can be, move transfer part with other that are provided with movably with the 1st lens unit interlock, for example can be to move, be located at the mobile transfer part that makes in the travel mechanism that the 1st lens unit moves by the 1st driving mechanism.

In addition, the mobile transfer part that the interlock of the 1st lens unit and the 2nd lens unit is moved also comprises the member that is located at the 2nd lens unit side.

In addition, in the present embodiment, the example of mobile transfer part with 1 contact being described, still, also can be with contact more than 2 o'clock, in addition, also can be with bigger face contact.

(the 14 embodiment)

Figure 47 is the skeleton diagram and the block diagram of the camera head of the 14 embodiment.In Figure 47, in lens barrel 1, dispose the 1st lens combination the 2, the 2nd lens combination the 3, the 3rd lens combination 4 (below, the 3rd lens combination is called " condenser lens ").Utilize aperture portion 160 to adjust the light quantity of the object light of transmission the 1st lens combination 2 and the 2nd lens combination 3.Utilize imaging apparatus 5 to take the object light of each lens combination of transmission.

On the frame 152 of condenser lens 4, be fixed with abutting member 60.Position by limiting member 70 restriction abutting member 60.By the rotation of focus motor 150, cut threaded screw 151 and rotate, when frame 152 moves to the direction of imaging apparatus 5, abutting member 60 and limiting member 70 butts, restriction condenser lens 4 moves to the direction of imaging apparatus 5.

Handled by signal processing part 12 by the subject image of light.At systems control division 100, shutter release button, power knob, the operation signal of menu button action buttons 101 such as (all less than diagrams) and the picture signal of exporting from signal processing part 12 according to camera body send the control information of condenser lenses 4 and aperture portion 160 to control circuit 200.

Have, focus motor 150 is step motor again.In addition, in aperture portion 160, possess the blade that is used to drive adjusting light quantity described later step motor (below be called " diaphragm motor ".)

Focus driver 400 and aperture driver 500 are the pulse generating circuits that produce the drive current be used to drive step motor (below be called " driving pulse ").Control circuit 200 has the interface portion 205 that the control information of will send from systems control division 100 sends to focus driver 400 and aperture driver 500.The operational part 201, count section 202, origin position storage part 203, the side-play amount storage part 204 that also have the control information of calculating the control be used to carry out condenser lens 4 and aperture portion 160.

Figure 48 is the detailed diagram of control circuit 200 of the camera head of present embodiment.In Figure 48, count section 202 possesses: the on-position counter 210 that the on-position of focus motor 150 is counted; The absolute position counter 211 that resets or preset and the absolute position of focus motor 150 is counted by initial point reset processing described later.Also possess: the on-position counter 212 that the on-position of aperture motor 160a (aftermentioned) is counted; The absolute position counter 213 that resets or preset and the absolute position of aperture motor 160a is counted by initial point reset processing described later.

Focus motor driving command and the aperture motor driven instruction of operational part 201 by sending from interface portion 205, information according to count section 202 and origin position storage part 203, side-play amount storage part 204, carry out increasing progressively of on-position counter 210,212 and count or countdown, and the count value of reading each on-position counter.In addition, carry out resetting or presetting of absolute position counter 211,213, and read the count value of each absolute position counter.

Figure 49 is the motor part of camera head of present embodiment and the block diagram of focus driver.In Figure 49, the 400th, focus driver, 150a are the A phase coils, 150b is that B phase coil, 150c are the rotors, the 60th that has magnetized 2 utmost points, abutting member, the 70th, limiting member,

In Figure 47, illustrated that abutting member 60 is fixed on the condenser lens 4, limiting member 70 is limited in the example on the lens barrel 1.Do not change at this, but for the easy to understand explanation, with abutting member 60 is installed on the rotor 150c, the example of configurable limit member 70 describes near rotor 150c.

In the example of Figure 47, the abutting member of representing with solid line 60 is positioned at from the position of limiting member 70 to the position of aperture portion 160 directions displacement.As previously mentioned, when condenser lens 4 along with the rotation of focus motor 150 when the direction of the imaging apparatus 5 of condenser lens 4 moves, shown in dotted line, abutting member 60 and limiting member 70 butts.The position of the abutting member 60 of Figure 49 is equivalent to the position of the abutting member 60 shown in the solid line of Figure 47.To right rotation, abutting member 60 connects with limiting member 70 by rotor 150c.This position is equivalent to the position of the abutting member 60 shown in the dotted line of Figure 47.

Below, according to the example of Figure 49, the drive controlling of step motor is described.Figure 50 is the sequential chart of expression to the current-mode of the A phase coil of the motor part of the camera head of present embodiment and the exciting current that the B phase coil applies.Motor part is the step motor that drives by so-called 1-2 phase excitation mode.

By applying and, drive the step motor of 1-2 phase excitation mode to the positive and negative 2 Polarity Control electric currents of A phase coil 150a to the combination that applies of the positive and negative 2 Polarity Control electric currents of B phase coil 150b.At this, can consider to A phase coil 150a apply the positive polarity electric current situation (A+), apply the situation (A-) of negative polarity electric current and do not apply situation three kinds of situations such as (0) of any electric current.

In addition, it is also conceivable that to B phase coil 150b apply the positive polarity electric current situation (B+), apply the situation (B-) of negative polarity electric current and do not apply situation three kinds of situations such as (0) of any electric current.Therefore, the pattern that can apply electric current becomes 3 kinds * 3 profit=9 kind, but need remove A is reached the situation that B does not apply electric current mutually mutually, has 8 kinds of patterns.

Record in the sequential chart of Figure 50 from 8 kinds of current-modes of on-position numbering 0 to 7.Each on-position numbering is equivalent to following current-mode.Number 7 corresponding current-modes with following on-position numbering 0 to on-position and be applied to step motor successively, rotate the driving step motor.

(a) on-position numbering 0:(A phase, the B phase)=(A-, 0)

(b) on-position numbering 1:(A phase, the B phase)=(A-, B-)

(c) on-position numbering 2:(A phase, B phase)=(0, B-)

(d) on-position numbering 3:(A phase, B phase)=(A+, B-)

(e) on-position numbering 4:(A phase, B phase)=(A+, 0)

(f) on-position numbering 5:(A phase, B phase)=(A+, B+)

(g) on-position numbering 6:(A phase, B phase)=(0, B+)

(h) on-position numbering 70:(A phase, B phase)=(A-, B+)

Figure 51 is with the mode chart that concerns between abutting member 60 on-position when the position of leaving restriction site increases on-position numbering successively and comes near restriction site, motor part and the activation point in the camera head of expression present embodiment.It is 7 corresponding that Figure 51 (a)～(h) and above-mentioned on-position numbering 0～on-position are numbered.Each figure is equivalent to the figure that sees from the turning axle direction of the rotor 150c of step motor, and A phase coil 150a and B phase coil 150b are disposed on the positions that differing 90 degree on the sense of rotation of rotor 150c.

Seasonable with 0 pair of on-position numbering, B phase coil 150b is not being applied under the state of electric current, apply electric current from the A-terminal of A phase coil to the A+ terminal.Therefore, A phase coil 150a is the S utmost point that the N utmost point to rotor 150c attracts by excitation, remains on the position of Figure 51 (a).

Seasonable, apply electric current from the A-terminal of A phase coil 150a to the A+ terminal, and apply electric current to the B+ terminal from the B-terminal of B phase coil 150b with 1 pair of on-position numbering.Therefore,, attract the N utmost point of rotor 150c, remain on the position of Figure 51 (a) that attractive force separately equates by the S utmost point of excitation on both sides' coil.

Seasonable with 2 pairs of on-position numberings, A phase coil 150a is not being applied under the state of electric current, apply electric current from the B-terminal of B phase coil 150b to the B+ terminal.Therefore, be the S utmost point that the N utmost point to rotor 150c attracts by excitation on the B phase coil, remain on the position of Figure 51 (c).

Seasonable, apply electric current from the A+ terminal of A phase coil 150a to the A-terminal, and apply electric current to the B+ terminal from the B-terminal of B phase coil 1 50b with 3 pairs of on-position numberings.Therefore, A phase coil 150a is the N utmost point by excitation, and to attract the S utmost point of rotor 150c, B phase coil 150a is the S utmost point by excitation, to attract the N utmost point of rotor 150c, remains on the position of Figure 51 (d) that attractive force separately equates.

Seasonable with 4 pairs of on-position numberings, B phase coil 150b is not being applied under the state of electric current, apply electric current from the A+ terminal of A phase coil 150a to the A-terminal.Therefore, A phase coil 150 is by the N utmost point of excitation for the S utmost point of rotor 150c is attracted, and remains on the position of Figure 51 (e) that each attractive force matches.

Seasonable, apply electric current from the A+ terminal of A phase coil 150a to the A-terminal, and apply electric current to the B-terminal from the B+ terminal of B phase coil 150b with 5 pairs of on-position numberings.Therefore, by on both sides' coil by the N utmost point of excitation, attract the S utmost point of rotor 150c, remain on the position of Figure 51 (f) that attractive force separately equates.

Seasonable with 6 pairs of on-position numberings, A phase coil 150a is not being applied under the state of electric current, apply electric current from the B+ terminal of B phase coil 150b to the B-terminal.Therefore, B phase coil 150b is by the N utmost point of excitation for the S utmost point of rotor 150c is attracted, and remains on the position of Figure 51 (g) that attractive force separately equates.

Seasonable, apply electric current from the A-terminal of A phase coil 150a to the A+ terminal, and apply electric current to the B-terminal from the B+ terminal of B phase coil 150b with 7 pairs of on-position numberings.Therefore, A phase coil 150a is the S utmost point by excitation, and to attract the N utmost point of rotor 150c, B phase coil 150a is the N utmost point by excitation, attracting the S utmost point of rotor 150c, and remains on the position of Figure 51 (h) that attractive force separately equates.

When the state from the state transitions of on-position numbering 0 to on-position numbering 1, rotor 150c is subjected to position from on-position numbering 0 to right handed thrust, becomes the state of on-position numbering 1.When the state from the state transitions of on-position numbering 1 to on-position numbering 2, rotor 150c is subjected to position from on-position numbering 1 to right handed thrust, becomes the state of on-position numbering 2.Afterwards, same, when increasing the on-position numbering successively, rotor 150c is to right-hand rotation.In addition, after the on-position numbering 7, become on-position numbering 0.

As mentioned above, step motor is driven in rotation.In addition, A phase coil 150a and B phase coil 150b differ 90 degree in the rotation direction of rotor 150c and dispose, and therefore, this step motor has half i.e. resolution of 45 degree of 90 degree spacings of coil.

The mode chart that concerns between the on-position of the motor part that Figure 52 is expression when the state of Figure 51 (h) increases the on-position numbering successively and the activation point.As previously mentioned, in Figure 51, when rotor 150c was numbered 7 positions successively to right-hand rotation from on-position numbering 0 to on-position, in the position of Figure 51 (h) expression, abutting member 60 was limited member 70 and limits.Therefore, even this state is that rotor 150c is applied the state that also can not be further rotated to right handed propelling power.

Therefore, numbered 0 o'clock entering on-position from on-position numbering 7, rotor 150c does not rotate, and shown in Figure 52 (a), the position of Figure 51 (h) is kept in the position of rotor 150c.If abutting member 60 is limited member 70 restrictions, then rotor 150c rotates to the position of Figure 51 (a).

Under the state of Figure 52 (a), effect makes its dextrorotary propelling power to rotor 150c.That is, abutting member 60 direction shown in the arrow in figure is pushed limiting member 70.

Even enter on-position numbering 1, shown in Figure 52 (b), rotor 150c does not rotate, and the location dimension of rotor 150c is held in last position.If abutting member 60 is not limited member 70 restrictions, then rotor 150c is in the rotation of the position of Figure 51 (b).Under the state of Figure 52 (b), rotor 150c also acted on make its dextrorotary propelling power.That is, abutting member 60 direction shown in the arrow in figure is pushed limiting member 70.

Even enter on-position numbering 2, shown in Figure 52 (c), rotor 150c does not rotate yet, and last position is kept in the position of rotor 150c.If abutting member 60 is not limited member 70 restrictions, then, rotor 150c is in the rotation of the position of Figure 51 (c).Under the state of Figure 52 (c), to the dextrorotary propelling power of rotor 150c effect.That is, abutting member 60 direction shown in the arrow in figure is pushed limiting member 70.

Under the situation that enters on-position numbering 3, consider as Figure 52 (d) shown in, to keep these two kinds of the state of previous state and states that rotor 150c rotates in the position shown in Figure 51 (d).It is the reasons are as follows.In on-position numbering 0～2, magnetic pole is made its propelling power to right-hand rotation of rotor 150c by A phase coil 150a or B phase coil 150b excitation with effect.

On the other hand, in on-position numbering 3, A phase coil 150a is the N utmost point by excitation, and B phase coil 150b is the S utmost point by excitation, under the state of Figure 52 (d), from each coil rotor 150c is acted on reacting force equably.

Therefore, may produce following various effect: how much strong than the magnetic force of A phase coil 150a the magnetic force of B phase coil 150b is, conversely, how much strong than the magnetic force of B phase coil 150b the magnetic force of A phase coil 150a is, perhaps when applying when vibration from the outside, rotor 150c direction rotation left and remain on the state shown in Figure 51 (d).That is, this state has supposed that rotor 150c is in two kinds of positions of Figure 52 (d) and Figure 51 (d), therefore, and this state representation unsure state.

The state (figure below) of on-position numbering 4 is transferred in Figure 52 (e) expression from the confined state of rotor 150c (last figure).In on-position numbering 4, A phase coil 150a is the N utmost point by excitation, and B phase coil 150b is by excitation, and therefore, rotor 150c is from the direction rotation left of the rotor-position shown in the upside, and remains on the rotor-position shown in the downside.

The state (figure below) of on-position numbering 5 is transferred in Figure 52 (f) expression from the confined state of rotor 150c (last figure).In on-position numbering 5, A phase coil 150a and B phase coil 150b are the N utmost point by excitation, and therefore, rotor 150c is from the direction rotation left of the rotor-position shown in the upside, and remains on the rotor-position shown in the downside.

The state (figure below) of on-position numbering 6 is transferred in Figure 52 (g) expression from the confined state of rotor 150c (last figure).In on-position numbering 6, A phase coil 150a is not by excitation, and B phase coil 150b is the N utmost point by excitation, and therefore, rotor 150c rotates to left-hand from the rotor-position shown in the upside, and remains on the rotor-position shown in the downside.

The state of the on-position numbering 7 shown in Figure 52 (h) is that the holding position of rotor 150c is with the position corresponding to state of abutting member 60 with limiting member 70 butts.That is, the state of Figure 52 (h) is that rotor 150c is acted on the power of this position maintenance and the perfect condition that just contacts at this holding position abutting member 60 and limiting member 70, does not apply the power that abutting member 60 is pushed limiting member 70.Wherein, when limiting member 70 a little under the situation of inclined left direction, abutting member 60 is pushed to the direction of limiting member 70.Under this situation, effect makes its propelling power to the right rotation to rotor 150c.

As mentioned above, be connected at rotor 150c under the situation of restriction site, according to the on-position numbering, the direction that acts on the magnetic force of rotor magnet changes.Figure 53 be the expression present embodiment camera head rotor magnet the mode chart of relation between stressed direction and the on-position numbering.Be connected to as rotor 150c under the situation of restriction site, as previously mentioned, under the state of on- position numbering 7 and 3, rotor magnet do not acted on the magnetic rotation propelling power.

In addition, in on-position numbering 0～2, the magnetic force that the rotor magnet effect is pushed to the restriction site direction.On the contrary, at on-position numbering 4-6, effect makes the magnetic force of its direction of leaving from restriction site to rotor magnet.Its result, shown in Figure 53, the cyclic pattern that the suffered magnetic force of rotor magnet is numbered according to on-position changes.

Figure 54 is the key diagram of action of rotor 150c that is used to illustrate the camera head of present embodiment.The longitudinal axis express time sequence of Figure 54 is with the record accordingly of on-position numbering.In addition, the transverse axis of Figure 54 represents to limit near the position of end.Have, on the longitudinal axis, the expression of on-position numbering is to the driven state of restriction end again.

Figure 55 is the action flow chart of initial point reset processing of the camera head of present embodiment.Expression is programmed in the flow process in the systems control division shown in Figure 47 100, has been indicated under the situation of power connection by 101 pairs of systems control divisions 100 of action button pressing power knob, begins to handle from the initial point reset processing.

Below, describe the initial point reset processing in detail.In Figure 47, the interface portion 205 in the control circuit 200 is connected with aperture driver 500 with focus driver 400 according to the indication of operational part 201, can send signal, and, connect into and can adjust indicator signal etc. from outside collectiong focusing indicator signal, aperture.

In addition, focus on indicator signal and be, for example from image sensor 5 outputs, implemented the picture signal etc. of the Flame Image Process of regulation, be the signal of information that comprises the change of the focusing object distance of specifying image pickup optical system.

In addition, aperture adjustment indicator signal is that for example basis detects exposure status from the monochrome information of image sensor 5 outputs, shrinks aperture portion 60 in indication under the bright situation, indicates under dark situation and open the signal of aperture portion 160.

Count section 202 is according to the indication of operational part 201, and in order to drive focus motor 150 and aperture motor 160a by operational part 201, counting is to the driving pulse of focus driver 400 and the 500 indication generations of aperture driver.Count section 200 is a benchmark with the origin position, produced from restriction end to away from the situation of the driving pulse that drives of direction rotation under, count value is successively decreased,, count value is increased progressively having produced under the situation of the driving pulse that the close direction rotation of restriction end drives.

The origin position storage part 203 storage on-position corresponding with the origin position that detects in advance when dispatching from the factory etc. numbered.Side-play amount storage part 204 is stored the corresponding on-position numbering of waiting status of the camera head that is predetermined with wide-angle side focal length state, limited object distance focusing state etc.

For said structure, be the action of the concrete control module of example explanation with the driving of focus motor 150.At first, when the dispatching from the factory of camera head, each camera head detected with the restriction of restrictions butt hold pairing on-position numbering, and be benchmark with this restriction end, with rotor magnet be subjected to from restriction end away from the on-position numbering of magnetic force of direction, store origin position storage part 203 into.Particularly, be under the situation of on-position numbering 7 when the on-position corresponding with restriction end, storage be arranged in from the restriction end away from the on-position of direction number 4～6 certain.

Under this state, when to the camera head energized, the initial point reset processing of the process flow diagram from Figure 55 begins, and begins to handle, make focus motor 150 move for 1 step, move to on-position numbering 1 from the numbering 0 of the on-position shown in Figure 54 to the restriction site direction shown in the step 501.Particularly, systems control division 100 sends the indication of focus motor 150 to 1 step of restriction extreme direction rotation by 205 pairs of operational parts 201 of interface portion, and operational part 201 increases progressively counting with on-position counter 210 and enters 1 from 0, reads count value.

Operational part 210 is by interface portion, and the current-mode that focus driver 400 is sent the on-position numbering that this count value is represented outputs to the indication of the A phase coil and the B phase coil of focus motor 150, and focus motor 150 was driven for 1 step to the restriction extreme direction.

Then, the step 502 in Figure 55 moves N more than the step, and, judge whether to have arrived with reference to on-position.At this, when representing the scope of focus motor 150 rotations with step number, N step expression is the step number of (restriction end) from the initiating terminal to the terminal for example.

In addition, with reference to on-position is the on-position of reading from origin position storage part 203, when the on-position corresponding with the restriction end is under the situation of on-position numbering 7, it is some that storage is arranged in the on-position numbering 4～6 of the direction of leaving from restriction end, at this on-position numbering 5 preserved as the reference on-position.

Make focus motor 150 when top begins to rotate when the moment, do not have mobile N more than the step, therefore, return the processing of step 501 in the moment that does not arrive the restriction end in energized.Afterwards, repeat step 501 and step 502, shown in Figure 54, arrive restriction end (beginning restriction) in on-position numbering 7.

In the condition that becomes this on-position numbering 7, in step 502, satisfy mobile N above condition of step, but on the other hand, because with reference to on-position is on-position numbering 5, so, step 501 returned again, make focus motor 150 to the rotation of restriction extreme direction, enter on- position 0,1,2,3,4.After on-position numbering 7 arrives the restriction end, be limited the end pushing up to on-position numbering 0～2, stop at the restriction end or to the position that is kept by excitation in on-position numbering 3.In on-position numbering 4, rotate to the position that is kept by excitation shown in Figure 54.

Then,, when being in on-position and numbering 5, move N more than the step in step 502 when moved for 1 step to the restriction site direction in step 501, and, satisfy the condition that arrives with reference to on-position (numbering 5 for on-position) at this, enter step 503.In step 503, absolute position counter 211 resets.At this constantly, the absolute position numbering becomes 0, determines the absolute position of focus motor 150, finishes the initial point reset processing.By above processing, determine the origin position of focus motor 150.

Then, operational part 201 read with side-play amount storage part 204 in the storage the suitable umber of pulse of skew amount of movement.At this, the skew amount of movement represents to leave from origin position the amount of movement of the ad-hoc location of predetermined distance.

In addition, the ad-hoc location that leaves predetermined distance from origin position is meant, for example, under the situation of focus motor 150, is typically referred to as the position of rotation of the focus motor 150 corresponding with the unlimited end of focus of camera head or pan focus zone.Under this situation, the skew amount of movement is specifically from the amount of movement of origin position with M (M is the positive integer more than 1) excitation mode regulation.

In addition, will suitably be set at constantly focus of the position corresponding, dump, aperture, zoom ring position etc. from the ad-hoc location that origin position leaves predetermined distance, variable skew amount of movement with intermediate focus position or telescope end.As mentioned above, by setting the skew amount of movement, can shorten from energized and begin time till the state that can use camera head.

As mentioned above, according to present embodiment, can not use sensor just can detect origin position by only appending the abutting member, the limiting member that move of ceiling structure system condenser lens.Do not having under the situation of sensor, considering the on-position numbering that storage in advance is corresponding with the restriction end,, carrying out origin position and detect in the position that becomes the pulse corresponding with this on-position numbering.

But, be set under the situation of arbitrary number in on-position numbering that will be corresponding with origin position, sometimes, can not correctly detect origin position according to selected on-position numbering.Specifically, in the example of present embodiment, be to number under the situation of 3 and 7 corresponding positions with on-position in the position corresponding with restriction end, as previously mentioned, therefore the position instability of rotor, is not suitable for being set at origin position.

In addition, to be rotor magnet be subjected to the position of magnetic force to the direction of pushing restriction site in the position corresponding with on-position numbering 0～2, therefore, produces error when increasing progressively the counting amount of movement from origin position, is not suitable for being set at origin position.For example, when origin position being set at when numbering 2 corresponding positions with on-position, shown in Figure 52 (c), abutting member 60 is during with limiting member 70 butts, as previously shown, and abutting member 60 pushing limiting members 70.

This pushing state is also constant in the position of the on-position numbering 1 of Figure 52 (b).Under this situation, on-position numbering becomes 1 from 2, is judged as condenser lens and has moved the distance that is equivalent to on-position numbering 1.But in fact, condenser lens is maintained at identical position, can not correctly hold the amount of movement from origin position.

At this, in the present embodiment, origin position is set in the positions corresponding with on-position numbering 4～6.Shown in Figure 54, under the situation that on-position numbering is advanced from the downward thruster of the upside of the longitudinal axis, after arriving restriction site, the position corresponding with on-position numbering 4～6 is the position of leaving from the restriction end.

This be because as illustrated with Figure 52 (e), (f), (g), the position corresponding with on-position numbering 4-6 is rotor magnet is subjected to position from magnetic force to the direction of leaving from restriction site.Therefore, when successively decreasing the on-position numbering from 11 ground that changes into, shown in the diagram that Figure 54 ground initial point reset position plays downside, condenser lens moves accordingly with the on-position numbering reliably.

Therefore, according to present embodiment, initial point is set in on-position numbers 406 corresponding positions,, do not use sensor etc. just can carry out definite control the in position of rotor accurately by former moving according to the step corresponding with the on-position numbering of lighting carried out position probing.

Have again, in the above-described embodiment, in the step motor of 1-2 phase excitation mode, the example that drives with 8 excitation modes of on-position numbering 0～7 is illustrated, but be not limited thereto, use the step motor of different excitation modes, can be set at for example excitation mode of 4-16 scope.

In addition, although understand the example that the on-position numbering is set at 0-7, the setting of on-position numbering also can be set at difference just for convenience of explanation.For example, can be set at 1～8 to the on-position numbering, the initial point of this moment is not to select from on-position numbering 4～6 as previously mentioned, and selects from excitation numbered positions 5～7.

Therefore, the performance of origin position can be considered various, for example, can be following performance.At n+1 (wherein with 0～n, n+1 is the even number more than 4) the situation of step motor of pattern of on-position under, the state that leaves limiting member 70 from abutting member 60 advances the on-position numbering, number when being set at n when the on-position of the state of abutting member 60 is initial and limiting member 70 butts, the range of choice of origin position becomes the scope of (n+1)/2～n-1.

(the 15 embodiment)

Figure 56 is motor part and the block diagram of aperture driver and the mode chart of aperture portion of the camera head of the 15 embodiment.Figure 57 is near the mode chart of the aperture portion the restriction end in the structure of Figure 56.Figure 56,57 suitable with aperture driver 500, the aperture portion 160 of Figure 47, the detailed structure of expression aperture portion 160.

The camera head of present embodiment has been used the initial point homing action principle of above-mentioned condenser lens.In the above-mentioned embodiment, driven member and condenser lens form the one frame, and in the present embodiment, driven member is rotary body 160e.

Aperture motor 160a and above-mentioned focus motor 150 are step motor equally, at this, omit the detailed description of aperture motor 160a.In addition, shown in Figure 56,57, aperture portion 160 possesses a plurality of light quantities and adjusts blade 160d.Each light quantity adjustment blade 160d has same structure and carries out same action.Therefore, for convenience of explanation, represent a light quantity adjustment blade 160, describe with its action that light quantity is adjusted blade 160d with solid line.

Aperture motor 160a rotates to illustrated right according to the current-mode from 500 outputs of aperture driver.Thereupon, swing pinion 160b rotates to right, and transmits revolving force to circular arc type gear 160c, makes rotary body 160e direction rotation left.In this action, along the guiding groove 160f that is formed on the rotary body 160e, it is center migration point 162 with support point 161 that light quantity is adjusted blade 160d, and shown in Figure 57, light quantity is adjusted blade 160d and driven to the direction of opening aperture.

At this, 160g is the limiting member that aperture is limited in the position of aperture minimum, and 160h is the limiting member that aperture is limited in open position.Limiting member 160h is equivalent to the limiting member 70 of Figure 47, and circular arc type gear 160c is equivalent to the abutting member 60 of Fig. 1.It is that limiting member 70 and abutting member 60 are connected that the initial point of above-mentioned condenser lens resets, but the initial point of the aperture in the present embodiment to reset be by circular arc type gear 160c and limiting member 160h butt are carried out.Present embodiment is compared with above-mentioned embodiment, controlling object thing difference, but the elemental motion that initial point resets is identical with above-mentioned embodiment.

As mentioned above, camera head according to the 14 embodiment, the 15 embodiment, on the direction of leaving from the restriction end that physically limits, be subjected to the on-position of magnetic force to be set at origin position rotor, even therefore position, also can determine origin position accurately without photoelectric sensor.

Have again, in the camera head of the 14 embodiment, the 15 embodiment, when camera head dispatches from the factory, in advance each camera head is detected with the restriction of restrictions butt and hold pairing on-position numbering, and the on-position numbering that will set corresponding to this on-position numbering stores the origin position storage part into as origin position.For it, also can in scope, infer the on-position numbering corresponding with origin position by the precision of member and assembly precision defined.

Particularly, in the camera head of above-mentioned the 14 embodiment, the explanation of the 15 embodiment, precision and assembly precision according to member, on-position numbering program design that will be corresponding with the restriction end is in the scope of on-position numbering 4 ± 1, and set positions that will be corresponding with actual origin position is for always returning 3 patterns from the on-position numbering that limits end.When as above setting, the on-position corresponding with initial point numbering can be omitted the relevant inspection of origin position when dispatching from the factory always in the scope of on-position numbering 4～6.

In addition, be not limited to the 14 embodiment, the 15 embodiment, can carry out various distortion.In the 14 embodiment, the 15 embodiment, show the example that lens barrel possesses focus motor and these two step motor of aperture motor, but be not limited thereto.Even possess at camera head under the situation of zoom motor of step function, can be suitable for the present invention equally.

In addition, under the situation of the so-called pan focus on the intrinsic limited photo distance, motor can have only zoom motor at focusing.Camera head comprises does not have the single focal lense of zoom function system, and under the situation of only focusing, motor can have only focus motor.

In addition, as the present invention's motor applicatory, go for lens combination with the direction of light shaft positive cross on the kine bias shift correction motor that is offset etc.In addition, under the situation of aperture motor, be offset the assigned position of the setting of amount of movement, can consider to wipe the high intermediate light loop diameter of frequency of utilization.

In addition, under the situation of picture jitter correction motor, can consider the optical axis and the system-wide optical axis consistent location of the lens combination under the common user mode.

In addition, the move mode during according to the zoom of image pickup optical system, the lens combination that zoom motor drives can be more than 1 group or 3 groups.Equally, the move mode during according to lens focus, the lens combination that focus motor drives can be more than 1 group or 3 groups.

In addition, the mapping device of applicable lens barrel of the present invention and travel mechanism can be the structures that is made of the relay lens frame that rotating cam tube and cam are connected, and also can be the structures that is made of the relay lens frame that links with bolt on rotating cylinder and rotating frame.

In addition, the step motor of the 14 embodiment, the 15 embodiment, stator comprises stator coil, rotor comprises rotor winding, but is not limited thereto.As step motor, also can be stator comprise customization magnet, rotor comprise rotor winding, to the structure of rotor-side supplying electric current.

By as above constituting step motor, the moment of inertia of rotor is diminished, can improve the location and wait the rotation limited characteristic.But, compare with the structure of the 14 embodiment, the 15 embodiment, on rotor winding, connect the complex structure of drive current.Therefore, as long as according to desirable characteristic, select a certain middle structure just passable.

In addition, after when power supply finishes, motor being moved to origin position, finish power supply, then when energized, on the direction of restriction end, (for example drove for 1 excitation cycle, till playing next on-position numbering 5 from on-position numbering 5) carry out the initial point reset processing, can shorten the start-up time till the photography when knowing power connection thus.This is because do not having under the state of energized, by camera head is applied external force, to the step motor swimming of the lens of not allowing voluble aperture motor or light weight.Especially, be preferably in and move to after the distinctive on-position that can oneself keep of step motor, cut off the electricity supply.

Utilizability on the industry

The present invention especially for the number that requires miniaturization or multifunction in succession, DV etc. is useful.

Claims (37)

1, a kind of camera head, lens barrel and camera body are separable, it is characterized in that,

The said lens lens barrel possesses:

The imaging lens system group comprises condenser lens, and subject is carried out imaging;

Motor drive mechanism comprises the motor that above-mentioned condenser lens is moved on optical axis direction;

Storing mechanism has been stored the information table of the control information that comprises above-mentioned condenser lens; And

The 1st data transmit-receive mechanism will send to above-mentioned camera body from the information of above-mentioned storing mechanism output;

Above-mentioned camera body possesses:

Picture pick-up device is made a video recording to the object light that is produced by above-mentioned imaging lens system group;

The 2nd data transmit-receive mechanism receives the information that sends from above-mentioned the 1st data transmit-receive mechanism; And

The motor control gear, according to reception information from the output of above-mentioned the 2nd data transmit-receive mechanism, the control said motor;

Through the information that above-mentioned the 2nd data transmit-receive mechanism sends to above-mentioned the 1st data transmit-receive mechanism, control above-mentioned condenser lens according to the said motor control gear.

2, camera head as claimed in claim 1 is characterized in that,

The said motor driving mechanism is according to the reception information from the output of said motor control gear, and output has periodic drive signal, and said motor moves above-mentioned condenser lens according to the above-mentioned drive signal of above-mentioned output on optical axis direction;

The said lens lens barrel also possesses the position-detection sensor that output valve changes according to the position of above-mentioned condenser lens;

The phase place of the above-mentioned drive signal when the said motor control gear reaches threshold value with the output valve of above-mentioned position-detection sensor, reference position as above-mentioned condenser lens is obtained, and, transmit the information of said reference position through the above-mentioned the 2nd and the 1st data transmit-receive mechanism, store as the information of the above-mentioned information table of above-mentioned storing mechanism.

3, camera head as claimed in claim 2 is characterized in that,

The said motor control gear will be obtained as the judgement position carried out the position of additive operation or subtraction from the said reference position that above-mentioned storing mechanism is read through the above-mentioned the 1st and the 2nd data transmit-receive mechanism;

With the synchronous timing of drive signal that drives the said motor driving mechanism, and detect the output valve of above-mentioned position-detection sensor through the above-mentioned the 1st and the 2nd data transmit-receive mechanism in above-mentioned judgement position, judge and above-mentionedly judge that whether the output valve of the above-mentioned position-detection sensor of position reaches above-mentioned threshold value, obtains the said reference position once more.

4, camera head as claimed in claim 3 is characterized in that,

Above-mentioned judgement position is the position of leaving 1/2 cycle of above-mentioned drive signal since the said reference position that above-mentioned storing mechanism is read.

5, camera head as claimed in claim 1 is characterized in that,

Above-mentioned information table comprises at least one in the information of maximum drive speed of the information of driving voltage of information, said motor of rotation resolution of information, said motor of the number of magnetic poles of said motor and said motor.

6, camera head as claimed in claim 1 is characterized in that,

Above-mentioned camera head also possesses temperature sensor, above-mentioned information table comprises the control information based on the position of the above-mentioned condenser lens of temperature, the said motor control gear is based on the temperature information and the above-mentioned control information of said temperature sensor, the position of proofreading and correct above-mentioned condenser lens according to temperature variation.

7, camera head as claimed in claim 1 is characterized in that,

Above-mentioned camera head also possesses angular transducer, above-mentioned information table comprises the control information based on the position of the above-mentioned condenser lens of posture angle, the said motor control gear changes the position of proofreading and correct above-mentioned condenser lens based on the angle information and the above-mentioned control information of above-mentioned angular transducer according to angle.

8, camera head as claimed in claim 1 is characterized in that,

Above-mentioned information table comprises the information of the life cycle of said motor, and the information of above-mentioned life cycle is upgraded according to the displacement or the traveling time that play the above-mentioned condenser lens of power supply between tailend from above-mentioned camera head power connection.

9, camera head as claimed in claim 1 is characterized in that,

In motor, electrostatic motor and the piezo-electric motor that said motor is step motor, linear motor, ultrasonic motor, be made of the smooth impact driving mechanism any.

10, camera head as claimed in claim 1 is characterized in that,

Added parity check bit in the transceive data between above-mentioned the 1st transmitting-receiving mechanism and above-mentioned the 2nd transmitting-receiving mechanism.

11, a kind of lens barrel is characterized in that, possesses:

The imaging lens system group comprises condenser lens, and subject is carried out imaging; And

Motor drive mechanism comprises the motor that above-mentioned condenser lens is moved on optical axis direction;

Also possess:

Storing mechanism, storage comprises the information table of the control information of above-mentioned condenser lens; And

The 1st data transmit-receive mechanism will send to above-mentioned camera body from the information of above-mentioned storing mechanism output;

The said lens lens barrel is used for camera body, and this camera body comprises the motor control gear that the information of the above-mentioned condenser lens of control is exported via the 2nd data transmit-receive mechanism;

Via the information that above-mentioned the 2nd data transmit-receive mechanism sends to above-mentioned the 1st data transmit-receive mechanism, control above-mentioned condenser lens according to the said motor control gear.

12, lens barrel as claimed in claim 11 is characterized in that,

The said lens lens barrel also possesses the position-detection sensor that output valve changes according to the position of above-mentioned condenser lens;

With having periodic drive said motor and making above-mentioned condenser lens on optical axis direction when mobile according to above-mentioned drive signal, the phase place of the above-mentioned drive signal the when output valve of above-mentioned position-detection sensor is reached threshold value, as the reference position of above-mentioned condenser lens, the information of said reference position is stored as the information of the above-mentioned information table of above-mentioned storing mechanism.

13, lens barrel as claimed in claim 11 is characterized in that,

Above-mentioned information table comprises at least one in the information of maximum drive speed of the information of driving voltage of information, said motor of displacement resolution of information, said motor of the number of magnetic poles of said motor and said motor.

14, lens barrel as claimed in claim 11 is characterized in that, above-mentioned information table comprises the control information based on the position of the above-mentioned condenser lens of temperature.

15, lens barrel as claimed in claim 11 is characterized in that, above-mentioned information table comprises the control information based on the position of the above-mentioned condenser lens of posture angle.

16, lens barrel as claimed in claim 11 is characterized in that, above-mentioned information table can be stored the information of the life cycle of said motor.

17, lens barrel as claimed in claim 11 is characterized in that, any in motor, electrostatic motor and the piezo-electric motor that said motor is step motor, linear motor, ultrasonic motor, be made of the smooth impact driving mechanism.

18, lens barrel as claimed in claim 11 is characterized in that, has added parity check bit in the transceive data between above-mentioned the 1st transmitting-receiving mechanism and above-mentioned the 2nd transmitting-receiving mechanism.

19, a kind of camera body is used for lens barrel, it is characterized in that,

This lens barrel possesses: the imaging lens system group, comprise condenser lens, and subject is carried out imaging; Motor drive mechanism comprises the motor that above-mentioned condenser lens is moved on optical axis direction; Storing mechanism has been stored the information table of the control information that comprises above-mentioned condenser lens; The 1st data transmit-receive mechanism will send to above-mentioned camera body from the information of above-mentioned storing mechanism output;

Above-mentioned camera body comprises: picture pick-up device, the object light that is produced by above-mentioned imaging lens system group is made a video recording; The 2nd data transmit-receive mechanism receives the information that sends from above-mentioned the 1st data transmit-receive mechanism; The motor control gear, according to reception information from the output of above-mentioned the 2nd data transmit-receive mechanism, the control said motor;

The said motor control gear is upwards stated the information that the 1st data transmit-receive mechanism sends the above-mentioned condenser lens of control via above-mentioned the 2nd data transmit-receive mechanism.

20, a kind of camera head is characterized in that, comprising:

Lens barrel is set to the 1st lens unit and the 2nd lens unit respectively and can moves on optical axis direction;

The 1st driving mechanism moves above-mentioned the 1st lens unit on optical axis direction;

The 2nd driving mechanism moves above-mentioned the 2nd lens unit on optical axis direction;

Control gear is respectively to above-mentioned the 1st driving mechanism and above-mentioned the 2nd driving mechanism output control signal;

Position detecting mechanism detects the position of above-mentioned the 2nd lens unit, and, move by the butt of above-mentioned the 1st lens unit and above-mentioned the 2nd lens unit is caused, detect the position of above-mentioned the 1st lens unit.

21, camera head as claimed in claim 20 is characterized in that, above-mentioned position detecting mechanism possesses: the detected member that moves on optical axis direction with above-mentioned the 2nd lens unit; And, detect the sensor of the position on the optical axis direction of above-mentioned detected member.

22, camera head as claimed in claim 20 is characterized in that,

By moving by above-mentioned the 1st lens unit of above-mentioned the 1st drive mechanism, make after above-mentioned the 1st lens unit and above-mentioned the 2nd lens unit butt, above-mentioned the 2nd lens unit and above-mentioned the 1st lens unit are together moved, detect and be somebody's turn to do the position of the mobile detected member that together moves by position detecting mechanism, thereby detect the position of above-mentioned the 1st lens unit.

23, camera head as claimed in claim 20 is characterized in that,

Make after above-mentioned the 1st lens unit and above-mentioned the 2nd lens unit together move by above-mentioned the 1st driving mechanism, move above-mentioned the 2nd lens unit by above-mentioned the 2nd driving mechanism, detect and be somebody's turn to do the position of the mobile detected member that together moves by above-mentioned position-detection sensor, thereby detect the position of above-mentioned the 2nd lens unit.

24, camera head as claimed in claim 20 is characterized in that,

Above-mentioned the 2nd lens unit can move on optical axis direction along supporting member, by the movement limiting portion that is moved by above-mentioned the 2nd driving mechanism, carries out moving based on above-mentioned the 2nd lens unit of above-mentioned the 2nd drive mechanism;

Moving of above-mentioned the 2nd lens unit of above-mentioned the 1st drive unit drives, by carrying out with the mobile transfer part of above-mentioned the 1st lens unit interlock, with above-mentioned movement limiting portion and above-mentioned mobile transfer part together be configured in above-mentioned supporting member near.

25, camera head as claimed in claim 21 is characterized in that,

Above-mentioned position detecting mechanism is a transmittance type sensor, and above-mentioned detected member is the light shading member of above-mentioned transmittance type sensor.

26, camera head as claimed in claim 20 is characterized in that, above-mentioned the 1st lens unit is a Zoom lens unit, and above-mentioned the 2nd lens unit is the condenser lens unit.

27, a kind of camera head is characterized in that, comprising:

Power supply;

Lens barrel has the 1st lens unit and the 2nd lens unit, and the 1st lens unit and the 2nd lens unit are removable on optical axis direction respectively;

The 1st driving mechanism moves above-mentioned the 1st lens unit on optical axis direction;

The 2nd driving mechanism moves above-mentioned the 2nd lens unit on optical axis direction;

Control gear from above-mentioned power supply supply power the time and when cutting off the electricity supply, moves above-mentioned the 1st lens unit by above-mentioned the 1st driving mechanism at least, carries out predefined power supply when supplying with and the processing action during dump;

Storing mechanism, the information different with the abnormal ending state storage according to the normal termination state, described normal termination state refers to cut off the electricity supply when supplying with from above-mentioned power supply supply condition, make above-mentioned the 1st lens unit and the 2nd lens unit move to the state of reception position according to predefined processing action, described abnormal ending state is meant under above-mentioned power supply supply condition, with the state of the state end different with above-mentioned normal termination state;

By the supply of the power supply behind the above-mentioned abnormal ending state and according to the information that is stored in the above-mentioned storing mechanism, make above-mentioned the 1st lens unit and the 2nd lens unit return to above-mentioned normal termination state.

28, camera head as claimed in claim 27, it is characterized in that, by the supply of the power supply behind the above-mentioned abnormal ending state and according to the information that is stored in the above-mentioned storing mechanism, make above-mentioned the 1st lens unit and the 2nd lens unit return to above-mentioned normal termination state, and, at least by above-mentioned the 1st driving mechanism above-mentioned the 1st lens unit is moved, carry out the processing action when supplying with of predefined power supply.

29, camera head as claimed in claim 27 is characterized in that, above-mentioned storing mechanism is nonvolatile memory or the volatile memory that drives by secondary power.

30, camera head as claimed in claim 27 is characterized in that, above-mentioned the 1st lens unit is a Zoom lens unit, and above-mentioned the 2nd lens unit is the condenser lens unit.

31, a kind of drive unit drives driven member, it is characterized in that possessing:

The restriction end limits moving of above-mentioned driven member;

Step motor changes the rotation of the rotor that carries out by following on-position, drives above-mentioned driven member, and above-mentioned on-position changes the pattern corresponding to exciting current;

Driver is supplied with above-mentioned exciting current to above-mentioned step motor;

The origin position storage part is being stored the on-position corresponding with the origin position of above-mentioned driven member in advance;

Count section, the above-mentioned on-position that the pattern of the above-mentioned exciting current supplied with above-mentioned driver is changed accordingly and count with the absolute position of the corresponding above-mentioned driven member of above-mentioned on-position; And

Operational part resets above-mentioned origin position;

The above-mentioned on-position that is stored in the above-mentioned origin position storage part is, when advancing above-mentioned on-position so that further advancing above-mentioned on-position under the mobile state that is limited by above-mentioned restriction end of above-mentioned driven member near above-mentioned restriction end and above-mentioned driven member, above-mentioned rotor is subjected to magnetic force so that the on-position that above-mentioned driven member leaves from above-mentioned restriction end.

32, drive unit as claimed in claim 31 is characterized in that,

The homing action of the origin position of above-mentioned operational part is following to carry out: read the above-mentioned on-position that is stored in the above-mentioned origin position storage part, and use the above-mentioned step motor of above-mentioned driver drives, advancing above-mentioned on-position so that above-mentioned driven member moving under the state that is limited by above-mentioned restriction end near above-mentioned restriction end and above-mentioned driven member, further on-position is advanced to and the above-mentioned corresponding position of above-mentioned on-position of reading, the value of above-mentioned absolute position that will be corresponding with this on-position resets.

33, drive unit as claimed in claim 31 is characterized in that,

The pattern of supplying with the exciting current of above-mentioned step motor has 0 to n n+1 kind, and n+1 is the even number more than 4;

Along with the numbering of above-mentioned exciting current pattern enters n from 0, above-mentioned driven member is near above-mentioned restriction end, and the pattern numbering of the above-mentioned exciting current when the mobile restriction of above-mentioned driven member is begun is set at n;

When each numbering with the numbering of above-mentioned on-position and above-mentioned exciting current pattern is set at 0 to n accordingly, the numbering of the above-mentioned on-position corresponding with above-mentioned origin position in (n+1)/2 to the scope of n-1.

34, drive unit as claimed in claim 31 is characterized in that,

Also possess the side-play amount storage part, storage and the above-mentioned on-position from be stored in above-mentioned origin position storage part play the suitable skew amount of movement of amount of movement of the ad-hoc location that leaves predetermined distance;

Above-mentioned operational part is controlled above-mentioned driver after the resetting of the origin position of above-mentioned driven member, above-mentioned driven member is moved be stored in the skew amount of movement in the above-mentioned side-play amount storage part.

35, drive unit as claimed in claim 31 is characterized in that,

Above-mentioned driven member is the aperture portion of the light quantity of control object light.

36, a kind of lens driver is characterized in that,

Possess the described drive unit of claim 31, above-mentioned driven member is the lens holding frames that is used to keep lens element.

37, lens driver as claimed in claim 36 is characterized in that,

Above-mentioned driven member is the aperture portion that said lens keeps the light quantity of frame and control object light.

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