CN104865775A - Jitter Correction Device, Lens Unit, Shooting Device And Driver - Google Patents
Jitter Correction Device, Lens Unit, Shooting Device And Driver Download PDFInfo
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- CN104865775A CN104865775A CN201510085201.0A CN201510085201A CN104865775A CN 104865775 A CN104865775 A CN 104865775A CN 201510085201 A CN201510085201 A CN 201510085201A CN 104865775 A CN104865775 A CN 104865775A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0007—Movement of one or more optical elements for control of motion blur
Abstract
The present invention provides a jitter correction device, a lens unit and a shooting device. The jitter correction device can determine the movement amount of a mobile frame in a first direction based on the position detected by a first position detection part; a first driving part comprises a first coil arranged on one of a fixing frame and the mobile frame, and a first magnet possessing more than three magnetic poles on a single surface and arranged on the other one of the fixing frame and the mobile frame. By applying a voltage to the above first coil, the above mobile frame can move relatively relative to the above fixing frame in the first direction, the first position detection part detects the relative position of the above mobile frame relative to the above fixing frame in the first direction by detecting a magnetic field generated by the first magnet, and on the single surface of the first magnet, the sum of the total magnetic flux generated by all N-pole magnetic pole part parts is roughly constant with the sum of the total magnetic flux of the all S-pole magnetic pole parts.
Description
Technical field
The present invention relates to jitter correction device, jitter correction device driver and there is the video camera of jitter correction device, the lens unit of digital camera or the mobile device with camera function etc. and camera head.
Background technology
In the past, be located in the jitter correction device on camera etc., utilize and employ the hand shaking that the hand shaking testing circuit detection camera of angular-rate sensor etc. occurs, based on this detection limit, driver is utilized to make maintenance such as the correction lens of a part for imaging lens system or the movable frame displacement of imaging apparatus, and make the optical axis relative displacement of imaging apparatus and image pickup optical system, suppress the shake of image thus.
In recent years, for the viewpoint of the designability of raising camera etc., there is the tendency expecting fuselage slimming.Therefore, the jitter correction device be equipped on such camera etc. also requires more compact structure.To this, Patent Document 1 discloses a kind of jitter correction device, it has driver, and this driver is provided with the magnet that magnetization has more than 3 magnetic poles.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2012-120303 publication
Driver disclosed in patent documentation 1 comprise magnet, relative with magnet and under the effect of the magnetic force produced by being energized with the coil of magnet relative movement and the position detection component (Hall element) of position detecting magnet, this magnet is at the one-sided magnetic pole piece with more than 3.Like this, by using, there is the magnet of more than 3 magnetic pole pieces, there is the such advantage of the degree of freedom of layout increasing coil, Hall element.Particularly, when adopting the lens barrel of so-called bending class in the slimming in order to realize camera etc., due to the limited space of thickness direction, therefore, such driver can perform well in jitter correction device.
But, the driver had disclosed in the one-sided patent documentation 1 possessing the magnet of more than 3 magnetic pole pieces does not take into full account the leakage of the magnetic flux of magnetic pole piece, distinguish that magnetic flux diffusion externally becomes many, the position detection component of another axle moving direction may be affected, cause position detection accuracy, the position control accuracy decline of revising lens or imaging apparatus.
Summary of the invention
The present invention completes in view of the above problems, though its object is to obtain a kind of driver, jitter correction device, lens unit and the camera head that can guarantee to shake Correction and Control accurately of being of compact construction.
At least one object to achieve these goals, the correction of shake when reflecting the 1st jitter correction device of a side of the present invention by driving the movable frame maintaining lens or solid-state imager to make a video recording along the 1st direction different from each other in the face roughly orthogonal with optical axis and the 2nd direction, wherein
This jitter correction device comprises: fixed frame; Movable frame, it can relative to above-mentioned fixed frame relative movement; 1st drive division, it makes above-mentioned movable frame move up above-mentioned 1st side relative to above-mentioned fixed frame; 2nd drive division, it makes above-mentioned movable frame move up above-mentioned 2nd side relative to above-mentioned fixed frame; 1st position detection component, it detects the relative position of above-mentioned movable frame relative to above-mentioned fixed frame; 2nd position detection component, it detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 2nd direction;
The amount of movement of above-mentioned movable frame on above-mentioned 1st direction can be determined based on the position detected by above-mentioned 1st position detection component;
Above-mentioned 1st drive division comprise the 1st coil on the side that is located in above-mentioned fixed frame and above-mentioned movable frame and be located at the opposing party in above-mentioned fixed frame and above-mentioned movable frame upper and at least one side have 3 extremely more than the 1st magnet of magnetic pole piece, by applying voltage to above-mentioned 1st coil, above-mentioned movable frame can be made relative to the relative movement on above-mentioned 1st direction of above-mentioned fixed frame;
Above-mentioned 1st position detection component detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction by detecting the magnetic field produced from above-mentioned 1st magnet;
At the above-mentioned one side of above-mentioned 1st magnet, the total magnetic flux sum that the total magnetic flux sum that the magnetic pole piece from all N pole produces and the magnetic pole piece from all S pole produce is roughly consistent.
One side have 3 extremely more than magnetic pole piece above-mentioned 1st magnet in, distinguish: there is the magnetic pole piece (side magnetic pole piece) at magnetic pole piece (center pole portion) and the two ends of central authorities and the vertical magnetic flux sum of each magnetic pole piece non-roughly consistent when, magnetic flux is easily to the External leakage of magnet, therefore, the magnetic flux spilt can affect above-mentioned 2nd position detection component, may cause position detection accuracy, the position control accuracy decline of revising lens or imaging apparatus.According to the present invention, by the above-mentioned one side at above-mentioned 1st magnet, the total magnetic flux sum that the total magnetic flux sum that magnetic pole piece from all N pole is produced and the magnetic pole piece from all S pole produce is roughly consistent, the magnetic field in above-mentioned 1st magnet can be made to reach balance, thus reduce magnetic flux leakage externally, the impact on the 2nd position detection component detecting the relative position become on the 2nd direction of another axle side can be suppressed thus, the position detection accuracy reducing and revise lens or imaging apparatus can be provided, the jitter correction device of the possibility that position control accuracy declines.
In above-mentioned 1st jitter correction device, preferably, at the one side of above-mentioned 1st magnet, the total magnetic flux sum that magnetic pole piece from all N pole produces is greater than 0.8 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces and is less than 1.2 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces.The total magnetic flux sum produced without the need to making the magnetic pole piece from all N pole is completely the same with the total magnetic flux sum produced from the magnetic pole piece of all S pole, be greater than 0.8 times of the total magnetic flux sum that magnetic pole piece from all S pole produces by the total magnetic flux sum making the magnetic pole piece from all N pole produce and be less than 1.2 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces, the leakage of magnetic flux can be reduced fully, therefore, it is possible to suppress the impact on above-mentioned 2nd position detection component.
In above-mentioned 1st jitter correction device, preferably, at the one side of above-mentioned 1st magnet, the total magnetic flux sum that magnetic pole piece from all N pole produces is more than or equal to 0.85 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces and is less than or equal to 1.15 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces.Be more than or equal to 0.85 times of the total magnetic flux sum that magnetic pole piece from all S pole produces by the total magnetic flux sum making the magnetic pole piece from all N pole produce and be less than or equal to 1.15 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces, more effectively can suppress the impact on above-mentioned 2nd position detection component.
At least one object to achieve these goals, the correction of shake when reflecting the 2nd jitter correction device of a side of the present invention by driving the movable frame maintaining lens or solid-state imager to make a video recording along the 1st direction different from each other in the face roughly orthogonal with optical axis and the 2nd direction, wherein
2nd jitter correction device comprises: fixed frame; Movable frame, it can relative to above-mentioned fixed frame relative movement; 1st drive division, it makes above-mentioned movable frame move up above-mentioned 1st side relative to above-mentioned fixed frame; 2nd drive division, it makes above-mentioned movable frame move up above-mentioned 2nd side relative to above-mentioned fixed frame; 1st position detection component, it detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction; 2nd position detection component, it detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 2nd direction;
The amount of movement of above-mentioned movable frame on above-mentioned 1st direction can be determined based on the position detected by above-mentioned 1st position detection component;
Above-mentioned 1st drive division comprises the 1st coil on the side that is located in above-mentioned fixed frame and above-mentioned movable frame and is located at the opposing party in above-mentioned fixed frame and above-mentioned movable frame upper and have the 1st magnet of the magnetic pole piece of 3 poles at one side, by applying voltage to above-mentioned 1st coil, above-mentioned movable frame can be made relative to the relative movement on above-mentioned 1st direction of above-mentioned fixed frame;
Above-mentioned 1st position detection component detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction by detecting the magnetic field produced from above-mentioned 1st magnet;
Above-mentioned 1st magnet comprises the center pole portion that is configured at central authorities and is configured at the both sides in this center pole portion and the side magnetic pole piece different from above-mentioned center pole portion polarity along above-mentioned 1st direction, the width of above-mentioned center pole portion on above-mentioned 1st direction is greater than 0.75 times of the width sum of above-mentioned side magnetic pole piece on above-mentioned 1st direction and is less than 1.75 times of the width sum of above-mentioned side magnetic pole piece on above-mentioned 1st direction.
In order to the above-mentioned one side at above-mentioned 1st magnet, the total magnetic flux sum that magnetic pole piece from all N pole is produced is close with the total magnetic flux sum produced from the magnetic pole piece of all S pole, make the width in center pole portion on above-mentioned 1st direction be inadequate with the width 1 to 1 of the side magnetic pole piece of its both sides, need to make the width in center pole portion larger.This is because, compared with center pole portion, the magnetic flux of side magnetic pole piece easily from side around to rear side, therefore, by the width making the width in center pole portion be greater than side magnetic pole piece, instead of merely make they 1 to 1, magnetic flux can be prevented well around to rear side.More specifically, be greater than 0.75 times of the width sum of above-mentioned side magnetic pole piece on above-mentioned 1st direction by making the width of above-mentioned center pole portion on above-mentioned 1st direction and be less than 1.75 times of the width sum of above-mentioned side magnetic pole piece on above-mentioned 1st direction, the total magnetic flux sum that the total magnetic flux sum that the magnetic pole piece from all N pole can be made to produce and the magnetic pole piece from all S pole produce is roughly consistent, can suppress the impact on above-mentioned 2nd position detection component.
In above-mentioned 2nd jitter correction device, preferably, the width of above-mentioned center pole portion on above-mentioned 1st direction is more than or equal to 0.8 times of the width sum of above-mentioned side magnetic pole piece on above-mentioned 1st direction and is less than or equal to 1.65 times of the width sum of above-mentioned side magnetic pole piece on above-mentioned 1st direction.Thereby, it is possible to more effectively suppress the impact on above-mentioned 2nd position detection component.
This lens unit comprises the above-mentioned 1st or the 2nd jitter correction device, have and import the optical system of multiple lens of object light to above-mentioned solid-state imager and keep the lens barrel of above-mentioned multiple lens.
In said lens unit, preferably, above-mentioned optical system is the optical system of the flexure type comprising the reflecting member that light path is bent.Owing to comprising the optical system and so-called bending optical system that utilize reflecting member to make light path bend, therefore, it is possible to make camera head slimming, but restriction can be produced to the space arranging jitter correction device thus.According to the present invention, by the 1st magnet using at least one side to have 3 extremely above magnetic pole pieces, the jitter correction device in space limited in a thickness direction can be realized, therefore, it is possible to be advantageously applied to such camera head.
This camera head comprises said lens unit and above-mentioned solid-state imager.
At least one object to achieve these goals, reflect that the driver of a side of the present invention is for jitter correction device, the correction of shake when this jitter correction device is by driving the movable frame maintaining lens or solid-state imager to make a video recording along the 1st direction different from each other in the face roughly orthogonal with optical axis and the 2nd direction, wherein
Above-mentioned jitter correction device comprises: fixed frame; Movable frame, it can relative to above-mentioned fixed frame relative movement; 1st position detection component, it detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction; 2nd position detection component, it detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 2nd direction;
The amount of movement of above-mentioned movable frame on above-mentioned 1st direction can be determined based on the position detected by above-mentioned 1st position detection component; Above-mentioned driver comprises the 1st drive division and the 2nd drive division, and the 1st drive division makes above-mentioned movable frame move up above-mentioned 1st side relative to above-mentioned fixed frame, and the 2nd drive division makes above-mentioned movable frame move up above-mentioned 2nd side relative to above-mentioned fixed frame;
Above-mentioned 1st drive division comprise the 1st coil on the side that is located in above-mentioned fixed frame and above-mentioned movable frame and be located at the opposing party in above-mentioned fixed frame and above-mentioned movable frame upper and at least one side have 3 extremely more than the 1st magnet of magnetic pole piece, by applying voltage to above-mentioned 1st coil, above-mentioned movable frame can be made relative to the relative movement on above-mentioned 1st direction of above-mentioned fixed frame;
Above-mentioned 1st position detection component detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction by detecting the magnetic field produced from above-mentioned 1st magnet;
At the above-mentioned one side of above-mentioned 1st magnet, the total magnetic flux sum that the total magnetic flux sum that the magnetic pole piece from all N pole produces and the magnetic pole piece from all S pole produce is roughly consistent.
According to this driver, the total magnetic flux sum produced by the total magnetic flux sum that makes the magnetic pole piece from all N pole produce at the above-mentioned one side of above-mentioned 1st magnet and the magnetic pole piece from all S pole is roughly consistent, the balance in the magnetic field in magnet can be obtained, reduce magnetic flux leakage externally, the impact on the 2nd position detection component detecting the relative position become on the 2nd direction of another axle side can be suppressed.
" total magnetic flux " refers to the total amount of the magnetic flux produced from the magnetic pole piece of magnet.When there being the magnetic pole piece of multiple homopolarity, it is the total of the magnetic flux of each magnetic pole piece.Total magnetic flux can be recorded by the magnetic-flux measurement employing search coil and fluxmeter.
It should be noted that, when arranging lens in jitter correction device, can be single lens, also can be multiple lens.In addition, fixed frame, movable frame can be single components, also can combine multiple part and form.
According to the present invention, though the driver, jitter correction device, lens unit and the camera head that are of compact construction and can guarantee to shake Correction and Control accurately can be obtained.
Accompanying drawing explanation
Fig. 1 is the main parallax stereogram of the camera head 10 of present embodiment.
Fig. 2 is the rear perspective view of the camera head 10 of present embodiment.
Fig. 3 is the stereographic map of the state represented after lens unit 50 pulled down by camera head 10.
Fig. 4 be comprise IV-IV line carry out cutting and the figure that obtains of the structure of observing Fig. 3 in the direction of the arrow in the face of the structure of Fig. 3.
Fig. 5 is the stereographic map of jitter correction device 52.
Fig. 6 be comprise VI-VI line carry out cutting and the figure that obtains of the structure of observing Fig. 5 in the direction of the arrow in the face of the structure of Fig. 5.
Fig. 7 be comprise VII-VII line carry out cutting and the figure that obtains of the structure of observing Fig. 6 in the direction of the arrow in the face of the structure of Fig. 6.
Fig. 8 is the stereographic map of retainer 101.
Fig. 9 is the stereographic map of fixed frame 100.
Figure 10 is the stereographic map of the magnet MG1 that self-sustaining frame 101 is pulled down.
Figure 11 is the magnet MG1 of comparative example 1 and the r direction cut-open view of yoke YK1.
Figure 12 is the magnet MG1 of comparative example 2 and the r direction cut-open view of yoke YK1.
Figure 13 is the magnet MG1 of embodiment and the r direction cut-open view of yoke YK1.
Embodiment
The camera head of embodiments of the present invention is described with reference to accompanying drawing.Fig. 1 is the main parallax stereogram of the camera head 10 of present embodiment, and camera head 10 is digital cameras, and Fig. 2 is the rear perspective view of the camera head 10 of present embodiment.
Camera head 10 as digital camera has the exterior housing 12 of formation.As shown in Figure 1 and Figure 2, housing 12 has the thickness of fore-and-aft direction, the height of above-below direction that size is larger than thickness and size than the width of highly large left and right directions, is formed as flat thinner rectangular plate-like.
As shown in Figure 1, be provided with opening 12a at the position of the sidepiece of keeping right on the front surface top of housing 12, the 1st lens combination of aftermentioned camera-lens system faces front by opening 12a and establishes in addition, is provided with the cover component 14 that can block opening 12a at front surface.
As shown in Figure 2, be provided with display 32 at the back side of housing 12, display 32 shows the image (view data) photographed, and display is for carrying out and shooting, the operation screen playing relevant various setting operations etc. or menu screen etc.Display part is formed by display 32.As display 32, the known display device such as liquid crystal indicator or organic EL display can be adopted.
Shutter release button 34, power switch 36 is provided with at the upper surface of housing 12.Zoom operation switch 38 and multiple operating switch 40 is provided with in the right side of the rear surface of housing 12, zoom operation switch 38 is for adjusting the zoom ratio of camera-lens system to side of looking in the distance (tele side) or wide-angle side (wide side), multiple operating switch 40 carries out the various operation such as switching of image pickup mode, play mode, or carries out the selection operation of option, the setting operation etc. of setting item of the menu screen being shown in display 32.
Fig. 3 is the stereographic map of the state represented after lens unit 50 pulled down by camera head 10.Fig. 4 be comprise IV-IV line carry out cutting and the figure that obtains of the structure of observing Fig. 3 in the direction of the arrow in the face of the structure of Fig. 3.
As shown in Figure 3, lens unit 50 entirety, in rectangular-shaped, has lens barrel 51 connected to each other and jitter correction device 52.
In the diagram, lens unit 50 has the camera-lens system OS of bending class.Camera-lens system OS is made up of the 1st lens combination L1, the 2nd lens combination L2, the 3rd lens combination L3, the 4th lens combination L4, the 5th lens combination L5 and not shown IR-CUT filter successively from object side., although not shown, but be provided with imaging apparatus in the below of lens unit 50 by fixed frame 100 in addition.
1st lens combination L1 is successively by concavees lens L1a, form as the prism PZ of the reflecting member making the optical axis of camera-lens system bend and convex lens L1b from object side, and they are installed in lens barrel 51.
2nd lens combination L2 is the lens combination of zoom, and the concavees lens L2a be arranged in order from object side, concavees lens L2b and convex lens L2c are integrally installed on retainer HLD1, and can move along optical axis direction relative to lens barrel 51.
3rd lens combination L3 is made up of 1 convex lens, is installed on lens barrel 51.4th lens combination L4 is the lens combination of zoom and focusing, and the concavees lens L4a be arranged in order from object side and convex lens L4b is integrally installed on retainer HLD2, and can move along optical axis direction relative to lens barrel 51.
5th lens combination L5 from object side successively by being held in the concavees lens L5a of lens barrel 51, the convex lens L5b being held in retainer 101 (movable frame) and the concavees lens L5c that is held in fixed frame 100 is formed.
The jitter correction device 52 of present embodiment is described.Fig. 5 is the stereographic map of jitter correction device 52, Fig. 6 be comprise VI-VI line carry out cutting and the figure that obtains of the structure of observing Fig. 5 in the direction of the arrow in the face of the structure of Fig. 5, Fig. 7 be comprise VII-VII line carry out cutting and the figure that obtains of the structure of observing Fig. 6 in the direction of the arrow in the face of the structure of Fig. 6, Fig. 8 is the stereographic map of retainer 101.Fig. 9 is the stereographic map of fixed frame 100.Figure 10 is the stereographic map of the magnet MG1 that self-sustaining frame 101 is pulled down, and its partial schematic ground represents.
In Fig. 6, Fig. 8, the retainer 101 be contained in jitter correction device 52 is the elongated tabular extended along the direction orthogonal with the optical axis of convex lens L5b, at one end side maintains convex lens L5b, stacked yoke YK1, the YK2 maintaining tabular in another side.On retainer 101, be adjacent to be provided with the yoke YK1 of object side the magnet MG1 that working direction drives.Above magnet MG1, fixed frame 100 is provided with sensor (Hall element) S1 of coil CL1 and the working direction position detection driven from the working direction of externally fed.The 1st drive division is formed by magnet MG1, yoke YK1, YK2, coil CL1.
Magnet MG1 is described.Up for object side, below are in Figure 10 of image side, magnet MG1 has 3 magnetic poles in one side magnetization.Specifically, magnet MG1 arranges along the direction (r direction) that the axle AX with turning axle 53 is orthogonal and is provided with 3 magnetic pole pieces MG1a, MG1b, MG1c (observe from image side and be configured to N pole, S pole, N pole, but also can be configured to S pole, N pole, S pole).The unmagnetized portion MG1d without polarity is formed between magnetic pole piece MG1a and MG1b, between magnetic pole piece MG1b and MG1c, be formed with the unmagnetized portion MG1e without polarity, they extend along the concentrically ringed tangential direction centered by rotation AX separately.At this, if when the width along r direction that the width along r direction that the width along r direction of magnetic pole piece MG1a is A, magnetic pole piece MG1b is B, magnetic pole piece MG1c is C, meet following formula.
0.75<B/(A+C)<1.75 (1)
It is even more preferred that meet following formula.
0.8≤B/(A+C)≤1.65 (1’)
As shown in Figure 6, coil CL1 magnet MG1 object side with across magnetic pole piece MG1a, MG1b and the mode making unmagnetized portion MG1d be positioned at its central authorities configure, as the 1st position detection component sensor S1 magnet MG1 object side with across magnetic pole piece MG1b, MG1c and the mode making unmagnetized portion MG1e be positioned at its central authorities configure.
Although can't see in Fig. 6, retainer 101 is adjacent to be provided with the magnet MG2 (with reference to Fig. 7) that sense of rotation drives with the yoke YK2 of imaging apparatus side.In the below of magnet MG2, fixed frame 100 is provided with sensor (Hall element) S2 of coil CL2 and the sense of rotation position detection driven from the sense of rotation of externally fed.The 2nd drive division is formed by magnet MG2, yoke YK1, YK2 and coil CL2.
In the section of Fig. 7, coil CL2 configures in the mode at the two poles of the earth across magnet MG2 in the image side of magnet MG2.Magnet MG1 and magnet MG2 configures in mode overlapping in the direction of the optical axis.As shown in Figure 6, the sensor S2 as the 2nd position detection component is configured in adjacent with coil CL2 and overlapping with magnet MG1 and magnet MG2 position in the image side of magnet MG2.
In figure 6, be formed with in the both ends of the surface of retainer 101 slit 101a, 101b, 101c, 101d (with reference to Fig. 8) that the left and right directions along Fig. 6 extends.In the slit 101d forming advance guide mechanism, engaging has self-retaining frame 100 vertically (with the direction that optical axis is almost parallel) turning axle 53 of extending.Thus, retainer 101 can move on the bearing of trend of elongated hole 101d relative to forming the turning axle 53 rotating guide mechanism, and can rotate around the rotation AX of turning axle 53 (with reference to Fig. 5).
As shown in Figure 9, the relative sidewall of fixed frame 100 is formed porose 100a, 100b (be blocked and can't see, but relative with 100a), 100c, 100d, and pin 54,55,56 (Fig. 5) runs through this some holes abreast.Pin 54 runs through fixed frame 100 ground and extends, and is sticked in the slit 101a of retainer 101.The two side of pin 55 and pin 56 self-retaining frame 100 respectively inwardly just extends, and the top of pin 55 is sticked in the slit 101b of retainer 101, and the top of pin 56 is sticked in the slit 101c of retainer 101.Adopt such structure, retainer 101 utilizes pin 54,55,56 to remain and can slide in face orthogonal with the optical axis.
The action of jitter correction device 52 is described.When the acceleration transducer etc. that camera head is located in utilization detects that there occurs image shakes, carry out shake correction by making retainer 101 and convex lens L5b together move.Specifically, when convex lens L5b will be driven along sense of rotation, be energized by the coil CL2 driven to sense of rotation and give magnet MG2 magnetic force, in Figure 5, convex lens L5b and by pin 54,55,56 guide retainer 101 together rotate around the rotation AX (the θ direction as the 2nd direction) of turning axle 53, its position is tried to achieve by detecting the magnetic field of magnet MG2 with Hall element S2, carries out FEEDBACK CONTROL.
On the other hand, when convex lens L5b will be driven along working direction, the coil CL1 driven by forward direction is energized and gives magnet MG1 magnetic force, in Figure 5, convex lens L5b and the retainer 101 guided by pin 54,55,56 mobile to the orthogonal direction (the r direction as the 1st direction) of the rotation AX with turning axle 53, its position is tried to achieve by detecting the magnetic field of magnet MG1 with Hall element S1, carries out FEEDBACK CONTROL.Thus, convex lens L5b can be displaced to the optional position on direction orthogonal with the optical axis relative to imaging apparatus.At this, divide the work like this in the magnetic pole piece of the one side of magnet MG1: detect the magnetic field produced from magnetic pole piece MG1b, MG1c of a pair N pole and S pole with Hall element S1, for detecting the position of movable frame relative to fixed frame, from above-mentioned a pair different another to the magnetic field of magnetic pole piece MG1a, MG1b of N pole and S pole for driving movable frame.
At this, in order to realize the high-precision position control of retainer 101, need to suppress the impact in the magnetic field of magnet MG1 to feed through to sensor S2.Therefore, in the present embodiment, by adjusting the size, magnetic force etc. of magnet on the face relative with yoke YK1 of magnet MG1, the total magnetic flux sum that the magnetic pole piece from all N pole is produced is greater than 0.8 times of the total magnetic flux sum that magnetic pole piece from all S pole produces and is less than 1.2 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces.More preferably, in magnet MG1, the total magnetic flux sum that the magnetic pole piece from all N pole is produced is greater than 0.85 times of the total magnetic flux sum that magnetic pole piece from all S pole produces and is less than 1.15 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces.That is, the total magnetic flux sum magnetic pole piece from all N pole being produced is roughly equal with the total magnetic flux sum produced from the magnetic pole piece of all S pole.Thereby, it is possible to reduce the magnetic flux to the External leakage of magnet MG1, therefore, it is possible to suppress the impact in the magnetic field of magnet MG1 to feed through to sensor S2, position detection accuracy, position control accuracy can be prevented to be deteriorated.
Below, the result of the simulation that the present inventor carries out is described.Figure 11 ~ Figure 13 changes the magnet MG1 of specification and the r direction cut-open view of yoke YK1 respectively, is the figure of the magnetic flux representing generation in the lump.At this, if the width on the r direction (left and right directions) of the magnetic pole piece MG1a of magnet MG1 is A, width on the r direction (left and right directions) of magnetic pole piece MG1b is B, and the width on the r direction (left and right directions) of magnetic pole piece MG1c is C.
In the magnet MG1 of the comparative example 1 of the specification shown in Figure 11, A=B=C, therefore, (A+C)/B=2, beyond the upper limit of (1) formula.As shown in figure 11, the magnetic flux that the outside to magnetic pole piece MG1a, the MG1c at two ends is leaked increases, and around the below to yoke YK1, may cause harmful effect to sensor S2 and cause position detection accuracy, position control accuracy to be deteriorated.
In addition, in the magnet MG1 of the comparative example 2 of the specification shown in Figure 12, (A+C)/B=0.5, beyond the lower limit of (1) formula.As shown in figure 12, the magnetic flux quantitative change produced from the upper surface (N pole) of the magnetic pole piece MG1b of central authorities is many, do not absorbed by the upper surface of magnetic pole piece MG1a, the MG1c at two ends (S pole) completely, but around the below to yoke YK1, may harmful effect be caused to sensor S2 and cause position detection accuracy, position control accuracy to be deteriorated.
On the other hand, in the magnet MG1 of the embodiment of the specification shown in Figure 13, (A+C)/B=1.0, meets (1) formula.Thus, the total magnetic flux sum that the magnetic pole piece from N pole produces is roughly equal with the total magnetic flux sum produced from the magnetic pole piece of all S pole.Therefore, as shown in figure 13, the magnetic flux that the upper surface (S pole) of the magnetic flux produced from the upper surface (N pole) of the magnetic pole piece MG1b of central authorities and magnetic pole piece MG1a, MG1c to two ends goes reaches balance, the magnetic flux of the below of yoke YK1 significantly reduces, therefore, can avoid causing harmful effect to sensor S2, position detection accuracy, position control accuracy can be prevented to be deteriorated.
It should be noted that, assume in the present invention magnet MG1 be in length and breadth, the constant rectangular plate-like of gauge, and define the value of the Width of magnetic pole piece, but, in the variform situation of magnet MG1, the size of magnetic pole piece also may exceed the scope of (1) formula or (1 ') formula sometimes.However, it should be understood that for: even if in such magnet, the total magnetic flux sum that magnetic pole piece from all N pole on its one side produces and the roughly consistent situation of the total magnetic flux sum that the magnetic pole piece from all S pole produces are also within the scope of the invention.
Below, the preferred scheme that above-mentioned jitter correction device is described is concluded.
Preferably, above-mentioned 2nd drive division comprises the 2nd coil on the side that is located in above-mentioned fixed frame and above-mentioned movable frame and is located at the 2nd magnet on the opposing party in above-mentioned fixed frame and above-mentioned movable frame, by applying voltage to above-mentioned 2nd coil, above-mentioned movable frame can be made relative to the relative movement on above-mentioned 2nd direction of above-mentioned fixed frame, and above-mentioned 2nd position detection component detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 2nd direction by detecting from the magnetic field of above-mentioned 2nd magnet generation.Thereby, it is possible to make above-mentioned movable frame move up in above-mentioned 1st direction and above-mentioned 2nd side relative to above-mentioned fixed frame, and above-mentioned movable frame can be detected respectively relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction and above-mentioned 2nd direction.
In addition, preferably, jitter correction device of the present invention comprises rotation guide mechanism and advance guide mechanism, this rotation guide mechanism enables above-mentioned movable frame guide above-mentioned movable frame rotationally around the axis almost parallel with above-mentioned optical axis, this advance guide mechanism enables above-mentioned movable frame guide above-mentioned movable frame movably along the working direction of the above-mentioned Axis Cross with above-mentioned rotation guide mechanism, above-mentioned 1st direction is above-mentioned working direction, and above-mentioned 2nd direction is the direction of rotating around above-mentioned axis.Thereby, it is possible to make above-mentioned movable frame move up in above-mentioned 1st direction and above-mentioned 2nd side relative to above-mentioned fixed frame, and above-mentioned movable frame can be detected relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction and above-mentioned 2nd direction.
In addition, preferably, above-mentioned 1st magnet and above-mentioned 2nd magnet accompany yoke with them in centre, and mode overlapping at least partially when optical axis direction is observed configures.By configuring above-mentioned 1st magnet and above-mentioned 2nd magnet like this, compact jitter correction device can be provided.In addition, cause dysgenic possibility high by the magnetic field of above-mentioned 1st magnet to above-mentioned 2nd position detection component, but, according to the present invention, the impact on the 2nd position detection component can be reduced, thus can apply well.
In addition, preferably, above-mentioned 1st magnet, above-mentioned 2nd magnet and yoke are fixed on above-mentioned movable frame, and above-mentioned 1st coil and above-mentioned 2nd coil are fixed on fixed frame.Compared with coil being equipped on the situation of above-mentioned movable frame, easily carry out the process etc. of distribution, can guarantee the degree of freedom designed further, in addition, also can realize the dual-purpose of yoke, be therefore preferred.
In addition, preferably, in the magnetic pole piece of the one side of above-mentioned 1st magnet, the magnetic field that the magnetic pole from a pair N pole and S pole produces is detected with above-mentioned 1st position detection component, for detecting the position of above-mentioned movable frame relative to above-mentioned fixed frame, be used for driving above-mentioned movable frame by from the magnetic field of above-mentioned a pair different another to the magnetic pole of N pole and S pole.By adopting said structure, the 1st position detection component can be configured on the moving direction of above-mentioned 1st drive division and for driving the coil of movable frame, therefore, it is possible to be advantageously applied to the situation of thinning on 1 direction of principal axis.In addition, when the magnetic pole piece of the one side of above-mentioned 1st magnet is 3 pole, detects by the magnetic pole of the central authorities in the magnetic pole of 3 poles being used for position and driving, the miniaturization of hand shaking correcting device can be realized.
The present invention is not limited to embodiment, the embodiment that this instructions is recorded, and also comprises other embodiments, variation, this to those skilled in the art, the embodiment recorded according to this instructions, technological thought are apparent.Such as, also solid-state imager can be equipped on retainer 101 and make it move in both direction orthogonal with the optical axis.Or, also can the one side of magnet MG2 arrange 3 extremely more than magnetic pole piece.Or, also can adopt the jitter correction device of the moving coil type of drive coil, instead of the jitter correction device of the movable magnet type of magnet.
10: camera head; 12: housing; 12a: opening; 14: cover component; 32: display; 34: shutter release button; 36: power switch; 38: zoom operation switch; 40: operating switch; 50: lens unit; 51: lens barrel; 52: jitter correction device; 53: turning axle; 54,55,56: pin; 100: fixed frame; 100a: hole; 100b: hole; 100c: hole; 100d: hole; 101: retainer; 101a: slit; 101b: slit; 101c: slit; 101d: slit; AX: rotation; CL1: coil; CL2: coil; HLD1: retainer; HLD2: retainer; L1 ~ L5: lens combination; MG1: magnet; MG2: magnet; PZ: prism; S1: sensor (Hall element); S2: sensor (Hall element); YK1: yoke; YK2: yoke.
Claims (14)
1. a jitter correction device, the correction of shake when it is by driving the movable frame maintaining lens or solid-state imager to make a video recording along the 1st direction different from each other in the face roughly orthogonal with optical axis and the 2nd direction, is characterized in that,
This jitter correction device comprises: fixed frame; Movable frame, it can relative to above-mentioned fixed frame relative movement; 1st drive division, it makes above-mentioned movable frame move up above-mentioned 1st side relative to above-mentioned fixed frame; 2nd drive division, it makes above-mentioned movable frame move up above-mentioned 2nd side relative to above-mentioned fixed frame; 1st position detection component, it detects the relative position of above-mentioned movable frame relative to above-mentioned fixed frame; 2nd position detection component, it detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 2nd direction;
The amount of movement of above-mentioned movable frame on above-mentioned 1st direction can be determined based on the position detected by above-mentioned 1st position detection component;
Above-mentioned 1st drive division comprise the 1st coil on the side that is located in above-mentioned fixed frame and above-mentioned movable frame and be located at the opposing party in above-mentioned fixed frame and above-mentioned movable frame upper and at least one side have 3 extremely more than the 1st magnet of magnetic pole piece, by applying voltage to above-mentioned 1st coil, above-mentioned movable frame can be made relative to the relative movement on above-mentioned 1st direction of above-mentioned fixed frame;
Above-mentioned 1st position detection component detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction by detecting the magnetic field produced from above-mentioned 1st magnet;
At the above-mentioned one side of above-mentioned 1st magnet, the total magnetic flux sum that the total magnetic flux sum that the magnetic pole piece from all N pole produces and the magnetic pole piece from all S pole produce is roughly consistent.
2. jitter correction device according to claim 1, is characterized in that,
At the one side of above-mentioned 1st magnet, the total magnetic flux sum that magnetic pole piece from all N pole produces is greater than 0.8 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces and is less than 1.2 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces.
3. jitter correction device according to claim 2, is characterized in that,
At the one side of above-mentioned 1st magnet, the total magnetic flux sum that magnetic pole piece from all N pole produces is more than or equal to 0.85 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces and is less than or equal to 1.15 times of the total magnetic flux sum that the magnetic pole piece from all S pole produces.
4. a jitter correction device, the correction of shake when it is by driving the movable frame maintaining lens or solid-state imager to make a video recording along the 1st direction different from each other in the face roughly orthogonal with optical axis and the 2nd direction, is characterized in that,
This jitter correction device comprises: fixed frame; Movable frame, it can relative to above-mentioned fixed frame relative movement; 1st drive division, it makes above-mentioned movable frame move up above-mentioned 1st side relative to above-mentioned fixed frame; 2nd drive division, it makes above-mentioned movable frame move up above-mentioned 2nd side relative to above-mentioned fixed frame; 1st position detection component, it detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction; 2nd position detection component, it detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 2nd direction;
The amount of movement of above-mentioned movable frame on above-mentioned 1st direction can be determined based on the position detected by above-mentioned 1st position detection component;
Above-mentioned 1st drive division comprises the 1st coil on the side that is located in above-mentioned fixed frame and above-mentioned movable frame and is located at the opposing party in above-mentioned fixed frame and above-mentioned movable frame upper and have the 1st magnet of the magnetic pole piece of 3 poles at one side, by applying voltage to above-mentioned 1st coil, above-mentioned movable frame can be made relative to the relative movement on above-mentioned 1st direction of above-mentioned fixed frame;
Above-mentioned 1st position detection component detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction by detecting the magnetic field produced from above-mentioned 1st magnet;
Above-mentioned 1st magnet comprises the center pole portion that is configured at central authorities and is configured at the both sides in this center pole portion and the side magnetic pole piece different from above-mentioned center pole portion polarity along above-mentioned 1st direction, the width of above-mentioned center pole portion on above-mentioned 1st direction is greater than 0.75 times of the width sum of above-mentioned side magnetic pole piece on above-mentioned 1st direction and is less than 1.75 times of the width sum of above-mentioned side magnetic pole piece on above-mentioned 1st direction.
5. jitter correction device according to claim 4, is characterized in that,
The width of above-mentioned center pole portion on above-mentioned 1st direction is more than or equal to 0.8 times of the width sum of above-mentioned side magnetic pole piece on above-mentioned 1st direction and is less than or equal to 1.65 times of the width sum of above-mentioned side magnetic pole piece on above-mentioned 1st direction.
6. the jitter correction device according to claim 1 or 4, is characterized in that,
Above-mentioned 2nd drive division comprises the 2nd coil on the side that is located in above-mentioned fixed frame and above-mentioned movable frame and is located at the 2nd magnet on the opposing party in above-mentioned fixed frame and above-mentioned movable frame, by applying voltage to above-mentioned 2nd coil, above-mentioned movable frame can be made relative to the relative movement on above-mentioned 2nd direction of above-mentioned fixed frame;
Above-mentioned 2nd position detection component detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 2nd direction by detecting the magnetic field produced from above-mentioned 2nd magnet.
7. the jitter correction device according to claim 1 or 4, is characterized in that,
This jitter correction device comprises rotation guide mechanism and advance guide mechanism, this rotation guide mechanism enables above-mentioned movable frame guide above-mentioned movable frame rotationally around the axis almost parallel with above-mentioned optical axis, this advance guide mechanism enables above-mentioned movable frame guide above-mentioned movable frame movably along the working direction of the above-mentioned axis vertical take-off with above-mentioned rotation guide mechanism, above-mentioned 1st direction is above-mentioned working direction, and above-mentioned 2nd direction is the direction of rotating around above-mentioned axis.
8. the jitter correction device according to claim 1 or 4, is characterized in that,
Above-mentioned 1st magnet and above-mentioned 2nd magnet with in their sandwich yokes and mode overlapping at least partially when optical axis direction is observed configure.
9. the jitter correction device according to claim 1 or 4, is characterized in that,
Above-mentioned 1st magnet, above-mentioned 2nd magnet and yoke are fixed on above-mentioned movable frame, and above-mentioned 1st coil and above-mentioned 2nd coil are fixed on fixed frame.
10. the jitter correction device according to claim 1 or 4, is characterized in that,
At the magnetic pole piece of the one side of above-mentioned 1st magnet, the magnetic field that the magnetic pole from a pair N pole and S pole produces is detected with above-mentioned 1st position detection component, for detecting the position of above-mentioned movable frame relative to above-mentioned fixed frame, from above-mentioned a pair different another to the magnetic field of the magnetic pole of N pole and S pole for driving above-mentioned movable frame.
11. 1 kinds of lens units, is characterized in that,
This lens unit comprises jitter correction device according to any one of claim 1 ~ 10, have and import the optical system of multiple lens of object light to solid-state imager and keep the lens barrel of above-mentioned multiple lens.
12. lens units according to claim 11, is characterized in that,
Above-mentioned optical system is the optical system of the flexure type comprising the reflecting member that light path is bent.
13. 1 kinds of camera heads, is characterized in that,
Above-mentioned camera head comprises lens unit described in claim 11 or 12 and solid-state imager.
14. 1 kinds of drivers, it is for jitter correction device, the correction of shake when this jitter correction device is by driving the movable frame maintaining lens or solid-state imager to make a video recording along the 1st direction different from each other in the face roughly orthogonal with optical axis and the 2nd direction, is characterized in that
Above-mentioned jitter correction device comprises: fixed frame; Movable frame, it can relative to above-mentioned fixed frame relative movement; 1st position detection component, it detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction; 2nd position detection component, it detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 2nd direction;
The amount of movement of above-mentioned movable frame on above-mentioned 1st direction can be determined based on the position detected by above-mentioned 1st position detection component;
Above-mentioned driver comprises the 1st drive division and the 2nd drive division, and the 1st drive division makes above-mentioned movable frame move up above-mentioned 1st side relative to above-mentioned fixed frame, and the 2nd drive division makes above-mentioned movable frame move up above-mentioned 2nd side relative to above-mentioned fixed frame;
Above-mentioned 1st drive division comprise the 1st coil on the side that is located in above-mentioned fixed frame and above-mentioned movable frame and be located at the opposing party in above-mentioned fixed frame and above-mentioned movable frame upper and at least one side have 3 extremely more than the 1st magnet of magnetic pole piece, by applying voltage to above-mentioned 1st coil, above-mentioned movable frame can be made relative to the relative movement on above-mentioned 1st direction of above-mentioned fixed frame;
Above-mentioned 1st position detection component detects above-mentioned movable frame relative to the relative position of above-mentioned fixed frame on above-mentioned 1st direction by detecting the magnetic field produced from above-mentioned 1st magnet;
At the above-mentioned one side of above-mentioned 1st magnet, the total magnetic flux sum that the total magnetic flux sum that the magnetic pole piece from all N pole produces and the magnetic pole piece from all S pole produce is roughly consistent.
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| JP2014032449A JP6485727B2 (en) | 2014-02-24 | 2014-02-24 | Blur correction device, lens unit, imaging device, and actuator |
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| JP2015158549A (en) | 2015-09-03 |
| CN104865775B (en) | 2018-01-05 |
| JP6485727B2 (en) | 2019-03-20 |
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