CN102636934B - Distance measuring device, distance measuring method, photographing device and photographing method - Google Patents
Distance measuring device, distance measuring method, photographing device and photographing method Download PDFInfo
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- CN102636934B CN102636934B CN201210023037.7A CN201210023037A CN102636934B CN 102636934 B CN102636934 B CN 102636934B CN 201210023037 A CN201210023037 A CN 201210023037A CN 102636934 B CN102636934 B CN 102636934B
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Abstract
The present invention relates to a distance measuring device, a distance measuring method, a photographing device with the distance measuring device, and a photographing method. The invention aims to stop power supply of certain special power supplies in the distance measuring device at a state without AF processing for reducing electric power consumption. The distance measuring device comprises the following components: first and second distance measuring lens (111,112) which images incident light of a photographed member, and first and second distance measuring components (121,122) which is used for outputting first and second distance measuring signals that correspond with the photographed member. Furthermore the distance measuring device can communicate with a main control device (10) which determines the distance between the distance measuring components and the photographed member based on the distance measuring signals. Furthermore the distance measuring device is provided with the following components: an image conversion part (130) which converts the distance measuring signals to a format that corresponds with the interface of the main control device, and a power supply control part (132) which controls power supply to the image conversion part. When the distance measuring device is converted from a common mode to an energy-saving mode, the power supply control part controls for stopping power supply to the image conversion part.
Description
Technical field
The present invention relates to distance measuring equipment and distance-finding method, and relate to the camera head and image capture method that possess this distance measuring equipment.This distance measuring equipment utilizes two images obtained with two range finding imaging apparatuss to determine the distance between this two range finding imaging apparatuss and subject, when not needing the state of auto-focusing process (hereinafter referred to as AF process), stop the power supply of some particular power source in the multiple power supplys used in distance measuring equipment action, try hard to reduce electricity consumption.
Background technology
About auto-focusing, there is various ways at present, such as, have contrast method and phase method, can be used for the automatic focusing function (hereinafter referred to as AF function) realizing with small digital cameras the camera head being representative.Contrast method AF mode refers to while the mobile camera lens forming image pickup optical system, while obtain image in the moment of regulation, then determine that in all images, contrast is the lens location of maximum image, and by lens moving to this position, to the method that subject is focused.In other words, contrast method AF mode needs the camera lens of actual dollying optical system within the scope of the driving of regulation.For this reason, contrast method AF mode, being for problem during long focal length lens, needs to determine to focus position with the longer processing time because lens driving range is large.
Compared to contrast method AF mode, phase method AF mode can focus at a high speed.Utilize the camera head of phase method AF mode to possess range-finding optical system, this range-finding optical system is the optical system of the other setting of the photographic optical system being different from shooting subject, has two imaging apparatuss.In phase method AF mode, obtain two images respectively with two imaging apparatuss, calculate the phase differential (parallax) between these two images, leave the distance of subject with these two imaging apparatuss of this phase difference calculating.Phase method AF mode does not need moving lens, and calculates based on shot object image, therefore, compared to contrast method AF mode, can comparatively fast determine to focus position.But above-mentioned two images export from two different imaging apparatuss respectively.If the moment or the image quality that obtain each image are inconsistent, then accurately cannot calculate parallax, for this reason, in the camera head adopting phase method AF mode, the image outpuT moment of each imaging apparatus needs synchronous, and the specification of imaging apparatus is consistent very important.But this high-performance imaging apparatus price is very expensive.In addition, because needing to carry the range-finding optical system being different from image pickup optical system, and this range-finding optical system needs higher installation accuracy, adopts phase method AF mode also can cause the problem that number of elements increases, manufacturing cost rises for this reason.
Except the AF mode of contrast method and phase method, also have mixing AF mode, which for solve contrast method and phase method AF mode in Problems existing.
First mixing AF mode roughly calculates the distance between distance measurement element and subject by phase place AF mode, according to the distance calculated by the lens location of the lens moving of image pickup optical system to regulation, focus by contrast method AF mode in the specialized range then near position after movement.In mixing AF mode, the distance of being undertaken by phase method AF mode calculates not high to accuracy requirement, and can reduce the driving scope of camera lens in contrast method AF mode, focuses the desired time therefore, it is possible to shorten.
Patent documentation 1 (TOHKEMY 2001-221945 publication) discloses and a kind ofly carries mixing AF mode and coordinate the multiple point distance measurement region obtained of AF unit possessing range-finding optical system to change the device in the AF region used when focusing detection by contrast method AF mode.In addition, patent documentation 2 (TOHKEMY 2003-107326 publication) discloses device in another, and this device changes the AF region with using during contrast method AF mode according to the distance between distance measurement element and subject.The AF region of focusing in contrast method AF mode is all needed to coordinate the range finding visual angle of the range-finding optical system of fixed-focus in device disclosed in above-mentioned patent documentation.
In recent years, to the further high speed high precision int of AF functional requirement, meanwhile, also require reduce distance measuring equipment manufacturing cost further and reduce electricity consumption.The high speed of existing distance measuring equipment and high precision int need to be developed further in the following areas, namely in employing phase method AF mode, need to improve further the quality of fit of the imaging apparatus output time when synchronism output two images possessing height moment adjustment function, or exploitation is arranged on for exporting the sensor special of the imaging apparatus of two images in custom layout (IC), or adopt the two hybrid plan etc.
But, possess the imaging apparatus of moment adjustment function or the cost of development of custom layout (IC) and manufacturing cost high, inconsistent with the object reducing distance measuring equipment manufacturing cost.And iff for reducing the object of manufacturing cost, cheap conventional imaging apparatus can be used, but in this case, in order to distance measuring equipment to should conventional imaging apparatus, can must transform the system of existing distance measuring equipment.
In camera head, carry out the overall large scale integrated circuit (LSI) controlled and usually adopt CPU and the unified system lsi (LSI) carrying out image procossing.And system LSI cannot answer increasing considerably of docking port as a rule.Therefore, whether can carry two cheap conventional imaging apparatuss and depend on that system LSI specification is changed in existing distance measuring equipment.But it is high but also time-consuming that the specification of system LSI changes not only cost, product is hindered to drop into batch production early.This problem is the new obstacle occurred in the utilization of the conventional imaging apparatus of cheapness.
For not having corresponding interface in system LSI but the distance measuring equipment of the conventional imaging apparatus needing lift-launch cheap, there is one and utilize the conversion circuit between distance measuring equipment (imaging apparatus) and camera head (system LSI) (conversion IC) to increase the method for imaging apparatus in prior art.But utilize conversion circuit, the electricity consumption of distance measuring equipment entire system can be caused to rise, the battery of the camera head increasing distance measuring equipment and possess this distance measuring equipment is consumed, and is difficult to maintain long continuous action.
[0011]
For the problems referred to above, can consider to solve with following methods, namely distance measuring equipment can cut off the action power of camera head circuit or imaging apparatus when not needing instant action, transfers to energy-conservation mode.But, form the element of conversion circuit as field programmable gate array (EPGA) and use multiple power supply, the method can make to transfer to energy-conservation mode or become complicated from Energy control when exiting energy-conservation mode for this reason, and the control time also will increase.Moreover, the number of elements for Energy control increases, and manufacturing cost also will rise thereupon.In addition, also can the problem that is squeezed of circuit for generating substrate arranged.
About the consumption of reduction distance measuring equipment battery, such as Patent Document 2 discloses a kind of camera, when this camera repeatedly carries out focus operation in continuous focusing mode, the reference variable of the focus evaluated value in the time interval and the time of restarting restarted is set according to photography conditions etc., optimize photographing actions, reduce battery consumption.
Although although the disclosed camera of patent documentation 2 can change the AF evaluation of estimate in contrast method AF mode according to photography conditions, reduce unwanted contrast AF process, and reduce battery consumption, but it does not provide and how to carry out in the distance measuring equipment of finding range based on phase method AF mode two conventional imaging apparatuss, keep the system LSI specification that uses in existing distance measuring equipment constant, reduce the cost simultaneously and reduce the method for battery consumption.
Summary of the invention
The object of the present invention is to provide a kind of distance measuring equipment for solving the problem and possess the camera head of this distance measuring equipment, this distance measuring equipment image that two range finding imaging apparatuss obtain is found range, and low cost of manufacture, energy-conservation Model control is simple.
In order to achieve the above object, the present invention specifically provides following technical scheme.
(1) first, the invention provides a kind of distance measuring equipment, can shift between conventional mode and energy-conservation mode, it is characterized in that, comprising: the first anallatic lens and the second anallatic lens, be provided for the image incoming light from subject, and, first distance measurement element and the second distance measurement element, be respectively used to output first distance measuring signal and the second distance measuring signal, this first distance measuring signal is corresponding with by the shot object image of described first anallatic lens imaging, this second distance measuring signal is corresponding with by the shot object image of described second anallatic lens imaging, and can communicate with main control unit, this main control unit is according to described first distance measuring signal and described second distance measuring signal, determine the distance between the second distance measurement element and described subject described in the Distance geometry between described first distance measurement element and described subject respectively, and then there is image converter section and power control part, this image converter section converts described first distance measuring signal and described second distance measuring signal the signal of corresponding described main control unit interface shape to, this power control part is for controlling the power supply of described image converter section, when transferring to described energy-conservation mode from described conventional mode, described power control part controls to stop powering to described image converter section.
(2) the present invention also provides the distance measuring equipment according to above-mentioned (1), and wherein, with image converter section described in multiple power drives, described power control part controls the power supply stopping a part of power supply in described multiple power supply.
(3) the present invention also provides the distance measuring equipment according to above-mentioned (1) or (2), wherein, also possesses clock supply unit, this clock supply unit provides the Action clock of described first distance measurement element and described second distance measurement element via described image converter section, when proceeding to described energy-conservation mode from described conventional mode, described power control part controls to stop powering to described clock supply unit, makes this clock supply unit stop providing described Action clock.
(4) the present invention also provides the distance measuring equipment according to above-mentioned (1) or (2), wherein, also possesses clock supply unit, this clock supply unit provides the Action clock of described first distance measurement element and described second distance measurement element via described image converter section, when proceeding to described energy-conservation mode from described conventional mode, described clock supply unit controls to stop to described first distance measurement element and described second distance measurement element that one of them provides Action clock.
(5) the present invention also provides the distance measuring equipment according to above-mentioned (4), wherein, described main control unit connects display, the image that display is corresponding with not being stopped distance measuring signal that distance measurement element that described Action clock supplies exports in described first distance measurement element and described second distance measurement element on the display.
(6) the present invention also provides the distance measuring equipment according to above-mentioned (1), wherein, can change the output time that described first distance measurement element and described second distance measurement element export described distance measuring signal in the unit interval.
(7) the present invention also provides another kind of distance measuring equipment, can shift, it is characterized in that, comprising: anallatic lens, be provided for the image incoming light from subject between conventional mode and energy-conservation mode, and, distance measurement element, for export with by the corresponding distance measuring signal of the shot object image of described anallatic lens imaging, and can communicate with main control unit, this main control unit determines the distance between described distance measurement element and described subject according to described distance measuring signal, and then also there is image converter section and power control part, described distance measuring signal is converted to the signal of corresponding described main control unit interface shape by this image converter section, this power control part is for controlling the power supply of described image converter section, when transferring to described energy-conservation mode from described conventional mode, described power control part controls the power supply stopping a part of described image converter section.
(8) the present invention also provides the distance measuring equipment according to above-mentioned (7), and wherein, with image converter section described in multiple power drives, described power control part controls the power supply stopping a part of power supply in described multiple power supply.
(9) the present invention also provides the distance measuring equipment according to above-mentioned (7) or (8), wherein, also possesses clock supply unit, this clock supply unit provides the Action clock of described distance measurement element via described image converter section, when transferring to described energy-conservation mode from described conventional mode, described power control part controls the power supply stopping described clock supply unit, makes this clock supply unit stop providing described Action clock.
(10) secondly, the invention provides a kind of camera head, wherein possess: image pickup optical system, comprising: pick-up lens, be provided for the image incoming light from subject; And, imaging apparatus, for export with by image pickup signal corresponding to the shot object image of described pick-up lens imaging; Range-finding optical system, comprising: anallatic lens, is provided for the image incoming light from subject; And, distance measurement element, for export with by the corresponding distance measuring signal of the shot object image of described anallatic lens imaging; Master control part, determines the distance between distance measurement element and subject according to described distance measuring signal, and calculates the amount of movement of described pick-up lens; And, focus unit, move described pick-up lens according to the above-mentioned amount of movement calculated along optical axis direction, it is characterized in that, with the distance measuring equipment described in any one in the invention described above (1) ~ (9) as described range-finding optical system.
(11) and then, the invention provides a kind of distance-finding method for distance measuring equipment, this distance measuring equipment can shift between conventional mode and energy-conservation mode, comprising: anallatic lens, is provided for the image incoming light from subject, and, distance measurement element, for export with by the corresponding distance measuring signal of the shot object image of described anallatic lens imaging, and can communicate with main control unit, this main control unit determines the distance between distance measurement element and described subject according to described distance measuring signal, and then also there is image converter section and power control part, described distance measuring signal is converted to the signal of corresponding described main control unit interface shape by this image converter section, this power control part is for controlling the power supply of described image converter section, the feature of described distance-finding method is, when transferring to described energy-conservation mode from described conventional mode, the step of the power supply controlling to stop a part of described image converter section is carried out by described power control part.
(12) the present invention also provides the distance-finding method according to above-mentioned (11), wherein, described distance measuring equipment also possesses clock supply unit, this clock supply unit provides the Action clock of described distance measurement element via described image converter section, when transferring to described energy-conservation mode from described conventional mode, described distance-finding method also comprises carries out the step controlling to stop powering to described clock supply unit and the step stopping providing described Action clock by described clock supply unit implementation by described power control part.
(13) moreover, the invention provides a kind of image capture method for camera head, this camera head comprises: pick-up lens, is provided for the image incoming light from subject; And, imaging apparatus, for export with by image pickup signal corresponding to the shot object image of described pick-up lens imaging; Range-finding optical system, comprising: anallatic lens, is provided for the image incoming light from subject; And, distance measurement element, for export with by the corresponding distance measuring signal of the shot object image of described anallatic lens imaging; Master control part, determines the distance between distance measurement element and subject according to described distance measuring signal, and calculates the amount of movement of described pick-up lens; And focus unit, move described pick-up lens according to the above-mentioned amount of movement calculated along optical axis direction, the feature of this camera head is, adopts the distance-finding method described in claim 11 or 12 to find range.
Effect of the present invention is as follows.Namely when not carrying out photograph processing etc. and not needing AF action, two range finding imaging apparatuss phase method AF mode used transfer to energy-conservation mode, stop inputting conversion interface circuit to carrying out image that image input changes between range finding imaging apparatus and main LSI Action clock being provided, and then, some specific action power of supply is stopped in multiple action power, like this, even if when not carrying out the startup stopping control based on each power supply sequential, also Control timing sequence can be reduced, realize toggle speed high speed, simplify circuit structure, and reduce electricity consumption.
Accompanying drawing explanation
Fig. 1 is the stereographic map of example display camera head outward appearance of the present invention.
Fig. 2 is the functional block diagram of the camera head shown in Fig. 1.
Fig. 3 is the figure for illustration of phase method AF mode principle.
Fig. 4 is the process flow diagram that AF process carried out by a routine camera head of the present invention.
Fig. 5 is the functional block diagram of a routine distance measuring equipment of the present invention.
Fig. 6 is the functional block diagram of the inner structure of distance measuring equipment shown in Fig. 5.
Fig. 7 is the routine mobile processing flow chart that the distance measuring equipment shown in Fig. 5 is carried out when transferring to energy-conservation mode.
Fig. 8 is the routine mobile processing flow chart that the distance measuring equipment shown in Fig. 5 is carried out when returning from energy-conservation mode.
Fig. 9 is the routine sequential chart that the distance measuring equipment shown in Fig. 5 is carried out when transferring to energy-conservation mode.
Figure 10 is the routine sequential chart that the distance measuring equipment shown in Fig. 5 is carried out when returning from energy-conservation mode.
Figure 11 is the functional block diagram of another routine distance measuring equipment of the present invention.
Figure 12 is the functional block diagram of the inner structure of distance measuring equipment shown in Figure 11.
The explanation of mark:
10 master controllers, 121,122 distance measurement element, 130 image converter sections, 131CLK supply unit, 132 power control parts
Embodiment
Based on accompanying drawing, the distance measuring equipment and method that the present invention relates to be described below and possess the camera head of this distance measuring equipment and the embodiment of image capture method.Fig. 1 is the stereographic map of the camera head outward appearance that an example the present invention relates to.The dead ahead of the camera head 1 shown in Fig. 1 is provided with image pickup optical system 20 and distance measuring equipment 100, this image pickup optical system 20 pick-up lens comprising focusing lens obtains subject image, and this distance measuring equipment 100 possesses the range-finding optical system obtaining subject image with anallatic lens 111 and 112.Image pickup optical system 20 and distance measuring equipment 100 are set respectively.In addition, as shown in Figure 1, the upper surface of camera head 1 is provided with shutter key and release key SW1 and the mode rotating disk SW2 for mode of selecting to photograph.Release key SW1 inside is provided with two switches, and half sends the first release signal by during release key SW1, sends the second release signal when pressing release key SW1 completely.Camera head 1 carries out AF process according to these release signals.
Fig. 2 is the functional block diagram of the camera head that an example the present invention relates to.Camera head 1 shown in Fig. 1 comprises master control part 10, optical system 20, imaging apparatus 30, A/D change-over circuit 40, liquid crystal indicator (LCD) 50, optical system drive point road 60, memory circuit 70, external interface (I/F) 80 and distance measuring equipment 100.
Master control part 10 comprises CPU and its peripheral circuits, and for controlling various actions (mechanicalness drived control and electric drive control) in camera head 1 and various image procossing, liquid crystal display, storage control and via the various control such as Control on Communication of external interface.
By optical system 20, the imaging on imaging apparatus 30 of subject image.Imaging apparatus 30 converts the image to electric signal.The subject picture signal formed with electric signal (simulating signal) that imaging apparatus 30 exports by A/D change-over circuit 40 is converted to digital signal.
Master control part 10 carries out the image procossing of regulation to the digital signal of the subject image after A/D change-over circuit 40 is changed, and is presented at as required on LCD50.Optical system driving circuit 60 controls by master control part 10, drives optical system 20 to carry out focusing adjustment, namely focus on along optical axis direction.
Distance measuring equipment 100 phase method AF mode measures the distance between distance measurement element and subject.
In addition, camera head 1 also has and resolves contrast based on the subject view data from imaging apparatus 30 and detect the function of focusing state.Memory circuit 70 comprises RAM and ROM, wherein preserves and inputs and view data after processed by master control part 10 and relate to the action of master control part 10 and the intermediate data of control treatment in interior process data etc. and then also preserve the view data that have taken from imaging apparatus 30.
Master control part 10 also comprises the memory controller for external memory, and this memory controller carries out between 80 and external memory storage writing and reading via external interface (I/O).The subject image obtained by optical system 20, imaging apparatus 30, A/D change-over circuit 40, when photographing, is presented on LCD50 by master control part 10.In addition, the action of imaging apparatus 30, A/D change-over circuit 40, LCD50 is also subject to the control of master control part 10, but does not clearly show at this.
Distance between the distance measurement element that master control part 10 calculates in phase method AF mode according to distance measuring equipment and subject, control both optical system driving circuit 60, the pick-up lens forming optical system 20 is moved to assigned position, then, in specialized range, dollying camera lens obtains and analyzes contrast-data, realizes the AF function of hybrid mode.
Master control part 10 carries out AF process with specified period.Half send the first release signal by release key SW1 after, start new AF process, during transmission first release signal, namely release key SW1 partly by period in, keep the result of this AF process.In this case, if decontrol release key SW1, then master control part 10 returns the AF process carried out with specified period.Otherwise, half is in by the release key SW1 of state and complete in release key SW1 if pressed further, then send the second release signal, now, view data is saved in memory circuit 70 by master control part 10, then on LCD50, show image confirming picture, and be sent to external memory storage by exterior I/080 write.
Secondly the action of distance measuring equipment of the present invention is described.Fig. 3 is the range measurement principle mode chart for illustration of calculating the spacing of distance measurement element and subject by phase method AF mode.Fig. 3 only show the first anallatic lens 111 and the second anallatic lens 112 and the first distance measurement element 121 and the second distance measurement element 122 in distance measuring equipment 100.First distance measurement element 121 and the second distance measurement element 122 are the imaging apparatuss such as CCD, and it exports the binary picture of the picture corresponding to the subject X with the first anallatic lens 111 and the second anallatic lens 112 imaging.Fig. 3 is schematic diagram when observing camera head 1 from upper surface.
As shown in Figure 3, base length B represents the distance between the first anallatic lens 111 and the second anallatic lens 112, and fL represents the focal length of the first anallatic lens 111, and fR represents the focal length of the second anallatic lens 112.Fig. 3 mid-focal length fL and fR is equal, therefore represents the focal length of the first anallatic lens 111 and the second anallatic lens 112 in the following description with f.At this, with base length B for benchmark, when the picture by the imaging in the first distance measurement element 121 of the first anallatic lens 111 is dL at a distance of the distance of base length B, and be dR through the picture of the second anallatic lens 112 imaging in the first distance measurement element 122 at a distance of the distance of base length B, with this base length B and image space dL and dR, calculate the distance between subject by following formula (1).
Like this, by measuring dL and dR being benchmark with base length B, the distance L between subject X can just be calculated.Then, with reference to the regulation coefficient calculated in advance be kept in memory storage 70, the overhang of the pick-up lens corresponding to distance L can just need only be converted to.Consider the size of distance measuring equipment and keeping within bounds and model of distance measurement element, base length B needs at more than 6mm.
Utilize the process flow diagram shown in Fig. 4 that the AF treatment scheme carried out in the camera head 1 of the present embodiment is described below.AF process being used in after carried out range finding by phase method AF mode of the present embodiment carries out high-precision focusing position detection by contrast method AF mode.
After partly sending the first release signal by release key SW1, start AF process, first carry out spectrum assignment (S10).Secondly, carry out AF process (S20) by phase method AF mode, then, judge the result (S30) of AF process (S20), if judge to focus unsuccessfully (S30's is no), then carry out fail condition and judge process (S70).Judge, in process (S70), when being judged as again carrying out AF process (S70's is no), then to return S20 in fail condition.And at the end of fail condition judges to judge this process in process (S70) (S70 is), then show mistake (S90) in the lcd 50, end process.About mistake display, such as, show red block region etc. and represent that result is unsuccessfully.
In judgement process (S30), if judge to focus successfully (S30 is), then after the distance moving lens calculated by phase method AF mode, around this lens location, carry out AF process (S40) by contrast method AF mode.Then, the result (S50) of the AF process that judgement contrast method AF mode is carried out.If judge focusing failure (S50's is no) of the AF process of S40, then carry out fail condition and judge process (S80).Judge in process (S80) in fail condition, if judge again to carry out the AF process (S80's is no) of S40, then return treatment S 40, and if judge that this process terminates (S80 is), on LCD50, then show mistake (S90), end process.Show the region of available red block etc. about mistake and represent that result is unsuccessfully.
In judgement process (S50), if judge to focus successfully (S50 is), then successfully show on LCD50 (S60).Represent that result is successfully about the region etc. successfully showing available green frame.
The display of the LCD50 in mistake Graphics Processing (S90) also can with being different from above-mentioned color display, in addition, except with except color box display, can also by flickering display or the display state etc. changing zone marker for distinguishing the form that AF process unsuccessfully shows.
The embodiment of distance measuring equipment of the present invention is described below with reference to accompanying drawing.
Fig. 5 is the module map of distance measuring equipment of the present invention.As shown in Figure 5, distance measuring equipment 100 comprises: the first anallatic lens 111 and the second anallatic lens 112, is provided for the image incoming light from photography target; First distance measurement element 121 and the second distance measurement element 122, establishes photo-electric conversion element to form by row, the electric charge that in this photo-electric conversion element, savings is corresponding with optical imagery; Image converter section 130, carries out the drived control of each imaging apparatus, and carries out conversion process, in order to output to master control part 10 to the picture signal that imaging apparatus exports; CLK supply unit 131, provides action reference clock via image converter section 130 to the first distance measurement element 121 and the second distance measurement element 122; And power control part 132, according to the instruction of master control part 10, controls the electric power supply (also referred to as power supply) that image dress changes portion 130 and CLK supply unit 131.
Below with reference to Fig. 6, the inner structure of one illustration as converter section 130 is described.Image converter section 130 indicates according to the action of master control part 10, and based on the action reference clock that CLK supply unit 131 provides, provides clock to the first distance measurement element 121 and the second distance measurement element 122.First distance measurement element 121 and the second distance measurement element 122 export the image of figure X (see Fig. 3) being shot according to clockwise image converter section 130 time this.The image that first distance measurement element 121 and the second distance measurement element 122 export is distance measuring signal.The image converter section 130 Video I/F being most suitable for each distance measurement element receives distance measuring signal.
In order to the distance measuring signal from the first distance measurement element 121 and the second distance measurement element 122 is sent to master control part 10, these distance measuring signals are converted to the signal form of the Video I/F of corresponding master control part by image converter section 130.Signal after conversion is sent to master control part for parallax computing.Like this, the distance measuring signal that the first distance measurement element 121 and the second distance measurement element 122 export after the regulation conversion process that image converter section 130 is carried out, the focusing process that the master control part 10 that just can be used for camera head 1 is carried out in phase method AF mode.
Image converter section 130 needs multiple action power.Such as, core power (1.2V), I/O power supply 1 (1.8V), PLL power supply (2.5V), I/O power supply 2 (3.1V).Except a part, Fig. 6 omits the connecting line that display connects each power supply to distance measuring equipment 10 power supply.In multiple action power, PLL power supply is as specific action power supply (hereinafter referred to as particular power source) (2.5V), and its power supply controls by power control part 132, and this power control part 132 indicates action according to master control part 10.When this particular power source is stopped power supply, image converter section 130 moves to energy-conservation mode from conventional mode, and when this particular power source starts to power, image converter section 130 returns conventional mode from energy-conservation mode.
Along with the action Model control of image converter section 130, the first distance measurement element 121 and the second distance measurement element 122 are transferred to energy-conservation mode or are returned from energy-conservation mode and be also controlled.Simultaneously or the action power of CLK supply unit 131, therefore, when moving to energy-conservation mode from conventional mode, particular power source stopped powering to CLK supply unit 131 in the moment of regulation for this particular power source.If stop the power supply of CLK supply unit 131, then image converter section 130 stops supply action reference clock, stops the distance measuring signal exporting from the first distance measurement element 121 and the second distance measurement element 122 for this reason.
Energy-conservation mode refers to that the particular power source of image converter section 130 and the particular power source of CLK supply unit 131 are stopped power supply, and makes image converter section 130 be in the state of stopping action.After particular power source is stopped power supply, CLK supply unit 131 stops providing Action clock to image converter section 130.And after CLK clock stopping supply, the internal circuit no longer action of image converter section 130, even if other power supplys such as core power, I/O power supply 1, I/O power supply 2 keeps power supply for this reason, the consumption electric power of image converter section 130 also will drop to less than 10 milliamperes.The simulation part of PLL divides the electrostatic current of generation about 20 milliamperes, if PLL power supply is stopped the power supply of this PLL power supply as particular power source, then can play sizable energy-saving effect, reduces the electricity consumption of distance measuring equipment 100.The energy-saving effect that the energy-conservation mode stopping particular power source powering is brought is approximately 50mW.
In energy-conservation mode, only stop the power supply of particular power source and keep other power supplys to continue power supply, the stand-by period waiting for each power initiation when energy-conservation mode returns conventional mode can also be shortened.
About the energy-conservation mode in the camera head 1 of the present embodiment, also there are other embodiments.Such as, when transferring to energy-conservation mode, stop the power supply of the particular power source of image converter section 130, and keep the particular power source of CLK supply unit 131 to continue power supply.Now, stop to the first distance measurement element 121 and the second distance measurement element 122 wherein a side Action clock is provided, a wherein side of the first distance measurement element 121 and the second distance measurement element 122 is made to stop exporting distance measuring signal, and the opposing party continues to export distance measuring signal, reduce the electricity consumption of a distance measurement element thus.The distance measuring signal continuing to keep the distance measurement element of action to export is the picture signal of subject, this picture signal is sent to master control part 10, for being shown to the LCD50 of camera head 1 as live view image.
In this case, even if stop the action of the imaging apparatus 30 of distance measuring equipment 1, camera head 1 still can show enforcement viewfinder image.And the electricity consumption of imaging apparatus 30 is greater than the electricity consumption of distance measurement element 121, stops the action of imaging apparatus 30 and only keep the first distance measurement element 121 or the second distance measurement element 122 action to implement viewfinder image in order to display, contributing to reducing electricity consumption.
About the energy-conservation mode of the camera head 1 of the present embodiment, other embodiments than that described above can also be exemplified further.Such as, when transferring to energy-conservation mode, stop the power supply of the particular power source of image converter section 130, and keep the particular power source of CLK supply unit 131 to continue power supply, continue to provide Action clock to the first distance measurement element 121 or the second distance measurement element 122.Now can also reduce the Action clock be provided in the distance measurement element of maintenance action, change the output time from distance measurement element output image signal during unit interval, reduce the electricity consumption of the distance measurement element that display image is in real time provided.
Namely so-called particular power source, in other words referred in the specification of the IC of composing images converter section 130, the power supply that can must be switched on or switched off by switch, or refer to the power supply that power consumption is larger.
Process flow diagram below with reference to Fig. 7 illustrates the mobile process of the distance measuring equipment 100 of a routine the present embodiment when shifting to energy-conservation mode.When to energy-conservation mode transfer, first, image converter section 130, according to the instruction of master control part 10, exports sleep signal (S101) to the first distance measurement element 121 and the second distance measurement element 122.Then, implementation etc. are pending, wait for that the first distance measurement element 121 and the second distance measurement element 122 move to the dormancy action desired time (S102).After fully waiting for, the instruction (S103) that master control part 10 stops to image converter section 130 sending action.Then, implementation etc. are pending, and Waiting Graph stops the action desired time (S104) as converter section 130.After fully waiting for, master control part 10 sends the instruction (S105) stopped to image converter section 130 output action benchmark CLK to CLK supply unit 131.Then, implementation etc. are pending, wait for that power control part 132 prepares CLK and stops the desired time (S106).After fully waiting for, master control part 10 sends instruction to power control part 132, requires that the particular power source of powering to image converter section 130 and CLK supply unit 131 stops exporting (S107).
By treatment step S101 to S107, distance measuring equipment 100 makes the first distance measurement element 121 and the second distance measurement element 122 transfer to dormancy mode, then stops the Action clock of image converter section 130, stops the power supply of the particular power source do not used during process in real time.Then, this energy-conservation mode remains to the startup instruction receiving master control part 10 always, till requiring to move to the action mode needing to carry out AF process (A108's is no).After the startup instruction receiving master control part 10 (S108 is), distance measuring equipment 100 terminates energy-conservation mode process, returns conventional action mode, namely return conventional mode from energy-conservation mode.
In above-mentioned treatment S 101, after first distance measurement element 121 and the second distance measurement element 122 receive the dormancy mode indicator signal that image converter section 130 sends according to the instruction of master control part 10, enter dormancy action, during this period, the first distance measurement element 121 and the second distance measurement element 122 can to carry out output image lower than the speed of the image transfer rate in conventional mode.Now, although be sent to the amount of images of master control part 10 than few during conventional mode from the first distance measurement element 121 and the second distance measurement element 122 via image converter section 130, the electricity consumption of the first distance measurement element 121 and the second distance measurement element 122 can be reduced.
Control when process flow diagram below with reference to Fig. 8 illustrates that the distance measuring equipment 100 of a routine the present embodiment returns conventional mode from energy-conservation mode.Camera head 1 is when shifting to the action mode carrying out AF process, and master control part 10 sends to image converter section 130 and starts instruction.Image converter section 130, after receiving startup instruction, starts the mobile process carrying out transferring to conventional mode from energy-conservation mode.
First, master control part 10 sends the instruction starting to export to power control part 132, requires that the particular power source of image converter section 130 and CLK supply unit 131 starts to power (S201).After receiving the instruction starting to export, implementation etc. are pending, wait for that particular power source starts to provide the electric power desired time (S202) to image converter section 130.After fully waiting for, master control part 10 starts the transmission (S203) to image converter section 130 transfer circuit information.Then, image converter section 130 launches the circuit information received in inside, prepares to carry out action in circuit.Master control part 10 implementations etc. are pending, wait until till receiving preparation end signal (S204's is no) always.After action preparation terminates, image converter section 130 sends to master control part 10 and prepares end signal (S204 is).Master control part 10 sends the instruction (S205) started to image converter section 130 output action benchmark CLK after receiving and preparing end signal to CLK supply unit 131.Then implementation etc. are pending, wait for that CLK supply unit 131 can stably to the sufficient time (S206) that image converter section 130 provides CLK to pass through.After the sufficient time, image converter section 130 carries out initial setting process (S207) according to the instruction of master control part 10.
Then, master control part 10 sends startup instruction (S208) via image converter section 130 to the first distance measurement element 121 and the second distance measurement element 122.First distance measurement element 121 and the second distance measurement element 122, after receiving startup instruction, carry out initial setting process (S209).Then implementation etc. are pending, wait for that the first distance measurement element 121 and the second distance measurement element 122 stablize the output image desired time (S210).Carrying out confirmation process after fully waiting for, confirm can correctly export relative to the value of initial setting the picture synchronization signal (S211) coming from the first distance measurement element 121 and the second distance measurement element 122 from master control part 10.This process is carried out always repeatedly, until picture synchronization signal can correctly be exported (S211's is no).If correctly output picture synchronization signal, then the start treatment of image converter section 130 terminates (S211 is).If the image transfer rate of the first distance measurement element 121 and the second distance measurement element 122 is set to lower during energy-conservation mode, then image transfer rate should be set as in the initial setting process in treatment S 209 the image transfer rate in conventional mode.
Fig. 9 shows routine sequential chart when distance measuring equipment 100 moves to energy-conservation mode.After in camera head 1, master control part 10 detects the action mode not needing AF process, start to carry out to image converter section 130 the mobile process shifted to energy-conservation mode.
After the mobile process shifted to energy-conservation mode starts, image converter section 130 accepts master control part 10 and accesses internal register via SIO, and the reset signal (Video_RESET1 and Video_RESET2) of the first distance measurement element 121 and the second distance measurement element 122 is set to invalid.Then, master control part 10 indicating image converter section 130 is by invalid for CLK output EN signal (Video_MCLK_EN) of the first distance measurement element 121 and the second distance measurement element 122.After image converter section 130 detects that Video_MCLK_EN is invalid, stop providing Action clock (Video_MCLK) to the first distance measurement element 121 and the second distance measurement element 122.Then, image converter section 130 accepts master control part 10 and accesses internal register via SIO, and the mobile indicator signal (Video_STBY1 and Video_STBY2) the first distance measurement element 121 and the second distance measurement element 122 being moved to sleep mode is invalid.Like this, the first distance measurement element 121 and the second distance measurement element 122 just move to sleep mode.Then, master control part 10 indicating image converter section 130 is by RESET invalidating signal, and image converter section 130 stops the action of inner main circuit.Then, CLK supply unit 131 will provide the EN invalidating signal of action benchmark CLK according to the instruction of master control part 10 to image converter section 130, stop providing CLK to image converter section 130.Like this, the inner all circuit operations of image converter section 130 all stop.Then, power control part 132 is according to the instruction of master control part 10, and by stopping, the indicator signal POWER25V_EN of the particular power source of powering to image converter section 130 is invalid.Like this, image converter section 130 just moves to sleep state and energy-conservation mode.
Figure 10 is the routine sequential chart of distance measuring equipment 100 when returning conventional mode from energy-conservation mode.When camera head 1 is to when needing the action mode of carrying out AF process to shift, master control part 10 sends to image converter section 130 and starts instruction.After image converter section 130 receives and starts instruction, come into effect the mobile process from energy-conservation mode to the transfer of conventional action mode.
After the mobile process of moving transfer to conventional mode starts, the POWER25V_EN of the particular power source that master control part 10 indicates power control part 132 instruction to be powered to image converter section 130 and CLK supply unit 131 is effective, makes particular power source start to power to image converter section 13.Because the power supply starting power supply needs certain hour, particular power source starts power supply therefore to need the sufficient time to wait for.After fully waiting for, carry out the transmission sequential of the circuit information that image converter section 130 inside is formed.
Specific as follows, master control part 10 is effective by nCONFIG signal, and after the nSTATUS signal that image converter section 130 is exported is effective, circuit information is sent to image converter section 130 by from master control part 10.The transmission of circuit information uses the serial communication for the particular port of image converter section 130.
After all circuit informations are sent to image converter section 130, master control part 10 indicating image converter section 130 is effective by CONFIG_DONE signal, thus master control part 10 can detect that circuit information is normally transmitted.After the transmission of notice master control part 10 circuit information terminates, image converter section 130 is unfolding circuits information internally, notifies that the INIT_DONE signal that user accesses as possible state is effective by being used for.
Master control part 10 confirm INIR_DONE signal effectively after, start access images converter section 130.First, master control part 10 indicates CLK supply unit 131 by providing the CLK_EN of the EN signal of action benchmark CLK effective to image converter section 130, starts to provide CLK to image converter section 130.Then, after waiting for that the clock provided from CLK supply unit 131 to image converter section 130 is fully stable, the RESET signal of image converter section 130 is effective, start action based on the circuit information subscriber's line circuit previously transmitted.
So, after the action of distance measuring equipment 100 starts, carry out the initialization process of the control register of image converter section 130, then, carry out the start treatment of the first distance measurement element 121 and the second distance measurement element 122.
Image converter section 130 is accessed after internal register via SIO, by effective for the dormancy indicator signal (Video_STBY1 and Video_STBY2) of the first distance measurement element 121 and the second distance measurement element 122 accepting master control part 10.Thus, the first distance measurement element 121 and the second distance measurement element 122 return conventional mode from dormancy mode and energy-conservation mode.Then, it is effective that CLK is exported EN signal by master control part 10, and image converter section 130, after detecting that this signal effectively, starts to provide Video_MCLK to the first distance measurement element 121 and the second distance measurement element 122.
And then image converter section 130 accepts master control part 10 and accesses internal register via SIO, by effective for the dormancy indicator signal (Video_STBY1 and Video_STBY2) of the first distance measurement element 121 and the second distance measurement element 122.Then, master control part 10 is passed through image converter section 130 and carries out initial setting process via SIO interface (I/O) to the first distance measurement element 121 and the second distance measurement element 122, starts to obtain image.
After this, after fully waiting until that each distance measurement element stablizes output image, image converter section 130 is carried out and is confirmed process, confirm that whether the first distance measurement element 121 and the second distance measurement element 122 are relative to the correct output image synchronizing signal of the numerical value of initial setting, if picture synchronization signal is normal, then terminate the start treatment of range finding process 100.
Another embodiment of distance measuring equipment of the present invention is described with accompanying drawing below.Figure 11 is the module map of the distance measuring equipment of the present embodiment.In the embodiment (see Fig. 5) illustrated above, distance measuring equipment 100 possesses CLK supply unit 131 and power control part 132, CLK supply unit 131 is according to the instruction of master control part 10, action reference clock is provided to image converter section 130, power control part 132, according to the instruction of master control part 10, stops the power supply providing the particular power source of action electric power to image converter section 130 and CLK supply unit 131.To this, the distance measuring equipment 100a of the present embodiment as shown in figure 11, the master control part 10 of camera head 1a possesses power control part 132 and CLK generates efferent 101, this power control part 102 provides the action electric power from particular power source to image converter section 130, and this CLK generates efferent 101 and provides action reference clock to image converter section 130.
The inner structure of the image converter section 130 of one routine the present embodiment is described with Figure 12 below.Image converter section 130 generates the action reference clock that provides of efferent 102 based on the CLK of master control part 10, provides Action clock to the first distance measurement element 121 and the second distance measurement element 122.First distance measurement element 121 and the second distance measurement element 122 export the image of subject X (see Fig. 3) to image converter section 130 according to this Action clock.The distance measuring equipment 100a of the present embodiment moves to energy-conservation mode as following, namely when master control part 10 detects that imaging apparatus 1a transfers to the action mode not needing AF process, this master control part 10 stops providing to the image converter section 130 in distance measuring equipment 100a the Action clock generating efferent 101 from CLK, and then power control part 102 stops providing the electric power from particular power source to supply to image converter section 130.
On the other hand, when distance measuring equipment 100a returns conventional action mode from energy-conservation mode, the power control part 102 of master control part 10 starts the power supply from particular power source to image converter section 130, then, with above in embodiment in distance measuring equipment 100 identical, carry out the circuit information that image converter section 130 inside formed and transmit sequential.After transmitting sequential normal termination, the CLK of master control part 10 generates efferent 101 to start to provide action reference clock to image converter section 130.After this, in the subscriber's line circuit based on the circuit information previously transmitted, action is started.
So, after distance measuring equipment 100a starts action, carry out the initialization process of the control register of image converter section 130, then, carry out the start treatment of the first distance measurement element 121 and the second distance measurement element 122.Then, stablize output image when image converter section 130 confirms each distance measurement element, and the picture synchronization signal that exports of the first distance measurement element 121 and the second distance measurement element 122 normal after, the start treatment of distance measuring equipment 100a terminates.
As mentioned above, camera head of the present invention is when the mode of photographing beyond mode, not need AF process, the distance measurement element utilized in the distance measuring equipment of phase method AF mode is transferred to energy-conservation mode, and by controlling the main LSI of camera head action, stopping phase method AF mode inputs the Action clock of the image transformation circuit of two images, and then, subtend image transformation circuit provides multiple power supplys of electric power, stop particular power source supply action electric power wherein, in order to reduce electricity consumption, shorten desired time of return when returning from energy-conservation mode simultaneously.
Action electric power is provided especially by stopping particular power source, no longer need to carry out the startup based on the sequential of multiple power supply and termination, the high speed of desired bulk treatment when contributing to shifting mode, realizes electricity consumption minimizing simultaneously, image transformation circuit structure simplifies and the simplification of control flow.
Claims (11)
1. a distance measuring equipment, can shift, it is characterized in that between conventional mode and energy-conservation mode,
Comprise: the first anallatic lens and the second anallatic lens, be provided for the image incoming light from subject; And, first distance measurement element and the second distance measurement element, be respectively used to output first distance measuring signal and the second distance measuring signal, this first distance measuring signal is corresponding with by the shot object image of described first anallatic lens imaging, this second distance measuring signal is corresponding with by the shot object image of described second anallatic lens imaging
And can communicate with main control unit, this main control unit is according to described first distance measuring signal and described second distance measuring signal, determine the distance between the second distance measurement element and described subject described in the Distance geometry between described first distance measurement element and described subject respectively
And then there is image converter section and power control part, this image converter section converts described first distance measuring signal and described second distance measuring signal the signal of corresponding described main control unit interface shape to, this power control part for controlling the power supply of described image converter section,
When transferring to described energy-conservation mode from described conventional mode, described power control part controls to stop powering to described image converter section,
Wherein, with image converter section described in multiple power drives, described power control part controls the power supply of the particular power source stopped in described multiple power supply, described particular power source refers in the specification of the integrated circuit of composing images converter section, the power supply that can must be switched on or switched off by switch, or refer to the power supply that power consumption is larger.
2. distance measuring equipment according to claim 1, wherein,
Also possess clock supply unit, this clock supply unit provides the Action clock of described first distance measurement element and described second distance measurement element via described image converter section,
When proceeding to described energy-conservation mode from described conventional mode, described power control part controls to stop powering to described clock supply unit, makes this clock supply unit stop providing described Action clock.
3. distance measuring equipment according to claim 1, wherein,
Also possess clock supply unit, this clock supply unit provides the Action clock of described first distance measurement element and described second distance measurement element via described image converter section,
When proceeding to described energy-conservation mode from described conventional mode, described clock supply unit controls to stop to described first distance measurement element and described second distance measurement element that one of them provides Action clock.
4. distance measuring equipment according to claim 3, wherein, described main control unit connects display, the image that display is corresponding with not being stopped distance measuring signal that distance measurement element that described Action clock supplies exports in described first distance measurement element and described second distance measurement element on the display.
5. distance measuring equipment according to claim 1, wherein, can change the output time that described first distance measurement element and described second distance measurement element export described distance measuring signal in the unit interval.
6. a distance measuring equipment, can shift, it is characterized in that between conventional mode and energy-conservation mode,
Comprise: anallatic lens, be provided for the image incoming light from subject; And, distance measurement element, for export with by the corresponding distance measuring signal of the shot object image of described anallatic lens imaging,
And can communicate with main control unit, this main control unit determines the distance between described distance measurement element and described subject according to described distance measuring signal,
And then also there is image converter section and power control part, described distance measuring signal is converted to the signal of corresponding described main control unit interface shape by this image converter section, this power control part for controlling the power supply of described image converter section,
When transferring to described energy-conservation mode from described conventional mode, described power control part controls the power supply stopping a part of described image converter section, wherein, with image converter section described in multiple power drives, described power control part controls the power supply of the particular power source stopped in described multiple power supply, described particular power source refers in the specification of the integrated circuit of composing images converter section, the power supply that can must be switched on or switched off by switch, or refers to the power supply that power consumption is larger.
7. distance measuring equipment according to claim 6, wherein,
Also possess clock supply unit, this clock supply unit provides the Action clock of described distance measurement element via described image converter section,
When transferring to described energy-conservation mode from described conventional mode, described power control part controls the power supply stopping described clock supply unit, makes this clock supply unit stop providing described Action clock.
8. a camera head, wherein possesses:
Image pickup optical system, comprising: pick-up lens, is provided for the image incoming light from subject; And, imaging apparatus, for export with by image pickup signal corresponding to the shot object image of described pick-up lens imaging;
Range-finding optical system, comprising: anallatic lens, is provided for the image incoming light from subject; And, distance measurement element, for export with by the corresponding distance measuring signal of the shot object image of described anallatic lens imaging;
Master control part, determines the distance between distance measurement element and subject according to described distance measuring signal, and calculates the amount of movement of described pick-up lens; And,
Focus unit, moves described pick-up lens according to the above-mentioned amount of movement calculated along optical axis direction,
It is characterized in that, with the distance measuring equipment in claim 1 ~ 7 described in any one as described range-finding optical system.
9., for a distance-finding method for distance measuring equipment, this distance measuring equipment can shift between conventional mode and energy-conservation mode, comprising: anallatic lens, is provided for the image incoming light from subject; And, distance measurement element, for export with by the corresponding distance measuring signal of the shot object image of described anallatic lens imaging, and can communicate with main control unit, this main control unit determines the distance between distance measurement element and described subject according to described distance measuring signal, and then also there is image converter section and power control part, described distance measuring signal is converted to the signal of corresponding described main control unit interface shape by this image converter section, this power control part is for controlling the power supply of described image converter section
The feature of described distance-finding method is, when transferring to described energy-conservation mode from described conventional mode, the step of the power supply of the particular power source controlling to stop in multiple power supplys of described image converter section is carried out by described power control part, wherein said particular power source refers in the specification of the integrated circuit of composing images converter section, the power supply that can must be switched on or switched off by switch, or refer to the power supply that power consumption is larger.
10. distance-finding method according to claim 9, wherein,
Described distance measuring equipment also possesses clock supply unit, and this clock supply unit provides the Action clock of described distance measurement element via described image converter section,
When transferring to described energy-conservation mode from described conventional mode, described distance-finding method also comprises carries out the step controlling to stop powering to described clock supply unit and the step stopping providing described Action clock by described clock supply unit implementation by described power control part.
11. 1 kinds of image capture methods for camera head, this camera head comprises: pick-up lens, is provided for the image incoming light from subject; And, imaging apparatus, for export with by image pickup signal corresponding to the shot object image of described pick-up lens imaging; Range-finding optical system, comprising: anallatic lens, is provided for the image incoming light from subject; And, distance measurement element, for export with by the corresponding distance measuring signal of the shot object image of described anallatic lens imaging; Master control part, determines the distance between distance measurement element and subject according to described distance measuring signal, and calculates the amount of movement of described pick-up lens; And focus unit, moves described pick-up lens according to the above-mentioned amount of movement calculated along optical axis direction,
The feature of this camera head is, adopts the distance-finding method described in claim 9 or 10 to find range.
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| JP2011-026319 | 2011-02-09 | ||
| JP2011026319A JP2012163923A (en) | 2011-02-09 | 2011-02-09 | Range finder, method, and program, and imaging apparatus, method, and program |
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| JP5911445B2 (en) | 2013-03-19 | 2016-04-27 | キヤノン株式会社 | Imaging apparatus and control method thereof |
| WO2018220940A1 (en) * | 2017-05-31 | 2018-12-06 | オリンパス株式会社 | Image capture device |
| JP7353924B2 (en) | 2019-11-08 | 2023-10-02 | キヤノン株式会社 | Image processing device, imaging device, image processing method, and program |
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| JP2004085936A (en) * | 2002-08-27 | 2004-03-18 | Olympus Corp | Camera |
| JP2004112570A (en) * | 2002-09-20 | 2004-04-08 | Toshiba Corp | Digital broadcast receiver and video display method |
| JP2005051505A (en) * | 2003-07-28 | 2005-02-24 | Fuji Photo Film Co Ltd | Stereoscopic photographing device |
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| JP2005292876A (en) * | 2004-03-31 | 2005-10-20 | Sanyo Electric Co Ltd | Image display system |
| JP2006178076A (en) * | 2004-12-21 | 2006-07-06 | Olympus Corp | Focus detector for camera |
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| JP2007310303A (en) * | 2006-05-22 | 2007-11-29 | Fujinon Corp | Lens system |
| JP2010287950A (en) * | 2009-06-09 | 2010-12-24 | Sanyo Electric Co Ltd | Electronic device |
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| US6868362B1 (en) * | 1999-03-31 | 2005-03-15 | Seiko Precision Inc. | Sensor system |
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