WO2020090751A1 - 演算装置、交換レンズ、カメラボディおよび撮像装置 - Google Patents

演算装置、交換レンズ、カメラボディおよび撮像装置 Download PDF

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Publication number
WO2020090751A1
WO2020090751A1 PCT/JP2019/042206 JP2019042206W WO2020090751A1 WO 2020090751 A1 WO2020090751 A1 WO 2020090751A1 JP 2019042206 W JP2019042206 W JP 2019042206W WO 2020090751 A1 WO2020090751 A1 WO 2020090751A1
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WIPO (PCT)
Prior art keywords
lens
information
control unit
side control
focusing lens
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/042206
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English (en)
French (fr)
Japanese (ja)
Inventor
聡志 風早
有紀 木ノ内
昭彦 小濱
柴田　悟
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Nikon Corp
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Nikon Corp
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Publication date
Application filed by Nikon Corp filed Critical Nikon Corp
Priority to US17/289,089 priority Critical patent/US11653096B2/en
Priority to CN201980085659.2A priority patent/CN113227893B/zh
Publication of WO2020090751A1 publication Critical patent/WO2020090751A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane
    • 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
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems
    • 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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
    • G03B17/14—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets interchangeably
    • 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
    • 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
    • H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
    • H04N23/663—Remote control of cameras or camera parts, e.g. by remote control devices for controlling interchangeable camera parts based on electronic image sensor signals
    • 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
    • H04N23/67—Focus control based on electronic image sensor signals
    • H04N23/672—Focus control based on electronic image sensor signals based on the phase difference signals
    • 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
    • H04N23/681—Motion detection
    • H04N23/6812—Motion detection based on additional sensors, e.g. acceleration sensors
    • 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
    • H04N23/682—Vibration or motion blur correction
    • H04N23/685—Vibration or motion blur correction performed by mechanical compensation
    • H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position

Definitions

  • the present invention relates to a computing device, an interchangeable lens, a camera body, and an image pickup device.
  • a technology is known that corrects shake (focus shake) in the optical axis direction by using an acceleration detection device that detects shake in the optical axis direction (see Patent Document 1).
  • the shake correction in the optical axis direction is performed only when the accumulation time of the image sensor for focus detection exceeds a predetermined value.
  • the arithmetic unit is an arithmetic unit that calculates the amount of movement of the focusing lens that adjusts the focus position of the imaging optical system in the optical axis direction, and captures an image by the imaging optical system.
  • a first input section for repeatedly inputting first information regarding the shift between the image pickup surface and the focus position, and second information for the shake in the optical axis direction of the image pickup optical system are repeatedly input at intervals shorter than the first information.
  • an interchangeable lens includes the arithmetic unit according to the first aspect and the imaging optical system.
  • a camera body includes the arithmetic unit according to the first aspect and the imaging surface.
  • an imaging device includes the arithmetic unit according to the first aspect, the imaging optical system, and the imaging surface.
  • FIG. 11 is a diagram showing a temporal change in the position of the focusing lens in the optical axis direction in Modification Example 1.
  • FIG. 11 is a diagram showing a temporal change in the position of the focusing lens in the optical axis direction in Modification 2.
  • FIG. 1 is a block diagram showing a main configuration of a camera system 1 equipped with a focus adjusting device according to an embodiment of the invention.
  • an interchangeable lens 3 is detachably attached to a camera body 2.
  • the optical axis O of the interchangeable lens 3 and the X-axis direction and the Y-axis direction in the plane intersecting the optical axis O are indicated by lines.
  • the camera system 1 illustrates an interchangeable lens type camera system 1, but the camera system 1 does not have to be an interchangeable lens type.
  • the camera system 1 may be a camera or video camera in which the camera body and the lens are integrated.
  • the image capturing device is not limited to a still image, and may be configured as an image capturing device such as a video camera or a mobile camera capturing a moving image.
  • the camera body 2 includes an operation member 220, a body side control unit 230, a body side storage unit 235, a body side communication unit 240, a power supply unit 250, an image sensor 260, a signal processing unit 270, and a display unit 280.
  • the image pickup device 260 is a solid-state image pickup device such as a CMOS image sensor or a CCD image sensor.
  • the image pickup device 260 picks up a subject image on the image pickup surface 260S and outputs a signal in accordance with a control signal from the body side control unit 230.
  • the image pickup device 260 can take a so-called live view image (also referred to as a live view image) for continuously displaying the image formation state on the display unit 280, in addition to the still image shooting.
  • the image sensor 260 has a photoelectric conversion unit for image generation and a photoelectric conversion unit for focus detection.
  • the image pickup pixel signal generated by the image generation photoelectric conversion unit is used by the image signal processing unit 270a of the signal processing unit 270 to generate an image.
  • the detection pixel signal generated by the focus detection photoelectric conversion unit is detected by the AF signal processing unit 270b of the signal processing unit 270 by the interchangeable lens 3, that is, the focus detection for detecting the focus of the interchangeable lens 3. Used for processing.
  • the image pickup device 260 is connected to the signal processing unit 270 and the body side control unit 230.
  • the signal processing unit 270 includes an image signal processing unit 270a and an AF signal processing unit 270b.
  • the image signal processing unit 270a performs predetermined image processing on the image pickup pixel signal output from the image pickup device 260 to generate an image.
  • the generated image data is recorded in a storage medium (not shown) in a predetermined file format or used for image display by the display unit 280.
  • the AF signal processing unit 270b performs focus detection processing such as a phase difference detection method or a contrast method using the detection pixel signal output from the image sensor 260 to perform a defocus amount (image forming position of the interchangeable lens 3). And the image pickup surface 260S).
  • the signal processing unit 270 is connected to the body-side control unit 230, the image sensor 260, and the display unit 280.
  • the body side communication section 240 performs predetermined communication with the lens side communication section 340.
  • the body side communication unit 240 is connected to the body side control unit 230.
  • An instruction to move a moving member (focusing lens 361a, etc.) included in the imaging optical system 360, an instruction to transmit information to the interchangeable lens 3, etc., by communication performed between the body side communication section 240 and the lens side communication section 340. Is transmitted from the camera body 2 to the interchangeable lens 3.
  • the position information of the moving member, the information read from the lens-side storage unit 350, and the like are transmitted from the interchangeable lens 3 to the camera body 2 in response to an information transmission instruction from the camera body 2. ..
  • the body side control unit 230 is composed of a microcomputer and its peripheral circuits.
  • the body-side control unit 230 executes the control program stored in the body-side storage unit 235 to control each unit in the camera body 2.
  • the body-side control unit 230 is connected to the operation member 220, the body-side storage unit 235, the body-side communication unit 240, the power supply unit 250, the image sensor 260, and the signal processing unit 270.
  • the body-side control unit 230 controls the entire camera body 2 such as image processing and the focus control of the interchangeable lens 3.
  • the body side control unit 230 calculates the amount of movement of the focusing lens 361a in the optical axis direction based on the defocus amount calculated by the signal processing unit 270b and the position information of the focusing lens 361a received from the interchangeable lens 3 by communication. To do.
  • the body-side control unit 230 further transmits the calculated movement amount of the focusing lens 361a to the interchangeable lens 3 by the body-side communication unit 240 as a movement instruction of the focusing lens 361a.
  • the body-side control unit 230 calculates the moving amount of the focusing lens 361 a and outputs a movement instruction to the interchangeable lens 3 every time the detection pixel signal is output from the image sensor 260 and the AF signal processing unit 270 b calculates the defocus amount. To send. For example, during shooting of a through image, the body-side control unit 230 causes the image sensor 260 to accumulate charges in a predetermined cycle, and thus causes the detection pixel signal to be output and the defocus amount to be calculated in the same cycle. The body-side control unit 230 also creates a movement instruction based on the defocus amount calculated in a predetermined cycle and the position information of the focusing lens 361a repeatedly received from the interchangeable lens 3 in a shorter cycle. Therefore, during shooting of a through image, the body-side control unit 230 causes the interchangeable lens 3 to transmit a movement instruction of the focusing lens 361a based on the charge accumulation period (frame rate).
  • the body side storage unit 235 stores a control program and the like executed by the body side control unit 230.
  • the body side storage unit 235 is controlled by the body side control unit 230 to record and read data.
  • the power supply unit 250 converts the voltage of a battery (not shown) into a voltage used by each unit of the camera system 1 and supplies the voltage to each unit of the camera body 2 and the interchangeable lens 3.
  • the power supply unit 250 can switch power supply on and off for each power supply destination according to an instruction from the body-side control unit 230.
  • the display unit 280 is composed of, for example, a liquid crystal display panel.
  • the display unit 280 displays an image based on the image data processed by the signal processing unit 270, an operation menu screen, or the like according to an instruction from the body-side control unit 230.
  • the image displayed by the display unit 280 includes a reproduced image (still image, moving image) based on image data recorded in the storage medium and the through image.
  • the shooting conditions may be set instead of the operation member 220.
  • the operation member 220 including a release button and operation switch is provided on the exterior surface of the camera body 2.
  • the operation member 220 sends an operation signal according to a user's operation to the body-side control unit 230.
  • the user operates the operation member 220 to issue a shooting instruction and a shooting condition setting instruction.
  • the release button is configured so that it can be pressed in two steps: half-press operation and full-press operation.
  • the half-push operation is a push-down operation up to about half the push-down amount in the full-push operation.
  • the setting of the shooting condition means whether the image to be shot is a still image or a moving image, whether the camera body 2 automatically determines the exposure, or a part of the aperture value, the shutter speed, and the sensitivity.
  • the user decides all, or the setting such as switching between the AF mode "S" mode and "C" mode.
  • S is an automatic focus adjustment mode in which the release button is pressed halfway to focus once, and then the focus is fixed during half-press operation.
  • C is an automatic focus adjustment mode in which the focus lens 361a continues to be transmitted while the release button is being pressed halfway, and focusing is continued.
  • the interchangeable lens 3 includes a lens-side control unit 330, a lens-side communication unit 340, a lens-side storage unit 350, an image pickup optical system 360, a lens driving unit 370, and a shake sensor 380.
  • the lens-side control unit 330 is composed of a microcomputer and its peripheral circuits.
  • the lens-side control section 330 executes the control program stored in the lens-side storage section 350 to control each section of the interchangeable lens 3.
  • the lens-side control unit 330 causes the lens driving unit 370a to move the focusing lens 361a based on the amount of movement of the focusing lens 361a instructed from the camera body 2 by communication.
  • the lens-side control unit 330 also calculates the movement amount of the shake correction lens 361b based on the shake amount detected by the shake sensor 380 and the position of the shake correction lens 361b detected by the lens driving unit 370b. Then, based on the calculated movement amount of the shake correction lens 361b, the lens drive unit 370b moves the shake correction lens 361b.
  • the lens-side control unit 330 is directly or indirectly connected to the lens-side communication unit 340, the lens-side storage unit 350, the lens driving unit 370, and the shake sensor 380.
  • the lens-side storage unit 350 is composed of a non-volatile storage medium.
  • the lens side storage unit 350 is controlled by the lens side control unit 330 to record and read data.
  • the lens-side storage unit 350 can store information on the interchangeable lens 3 in addition to storing a control program executed by the lens-side control unit 330 and the like.
  • the imaging optical system 360 forms a subject image on the imaging surface (imaging surface 260S).
  • the optical axis O of the image pickup optical system 360 substantially coincides with the center position of the image pickup surface 260S.
  • At least a part of the imaging optical system 360 is configured as a moving member so as to be able to move its position in the interchangeable lens 3.
  • the moving member includes a focusing lens 361a and a shake correction lens 361b.
  • the lens driving unit 370 moves the moving member, and includes a lens driving unit 370a and a lens driving unit 370b.
  • the lens driving unit 370 includes an actuator, a driving mechanism, and a position detecting unit for the moving member.
  • the focusing lens 361a is configured to be movable back and forth in the optical axis O direction by the lens driving unit 370a.
  • the moving direction, the moving amount, the moving speed, and the like of the focusing lens 361a may be included in the moving instruction from the body-side control unit 230, and the lens-side control unit 330 in consideration of the moving instruction from the body-side control unit 230. It may be determined by.
  • the position of the focusing lens 361a can be detected by the position detection unit (encoder, pulse signal of motor, etc.) of the lens driving unit 370a.
  • the lens driving unit 370a of the focusing lens 361a is preferably a stepping motor, a voice coil motor, or the like, which has a stop precision finer than the resolution of a shake sensor 380 described later.
  • the shake correction lens 361b is configured to be movable back and forth in a direction intersecting the optical axis O (direction having components in the X-axis direction and the Y-axis direction) by the lens driving unit 370b. By moving the shake correction lens 361b, shake of the subject image on the imaging surface 260S (image shake) is suppressed.
  • the lens-side control unit 330 may determine the moving direction, the moving amount, and the moving speed of the shake correction lens 361b.
  • a shake sensor is provided in the camera body 2, and the shake sensor is provided on the body side based on the shake detection signal from the shake sensor. It may be performed by the control unit 230.
  • the lens-side control unit 330 can also give an instruction to move the shake correction lens 361b in consideration of the instruction from the body-side control unit 230.
  • the position of the shake correction lens 361b can be detected by a Hall element or the like of the lens driving unit 370b.
  • the lens-side communication unit 340 performs predetermined communication with the body-side communication unit 240.
  • the lens side communication unit 340 is connected to the lens side control unit 330.
  • the communication content is as described regarding the body-side communication unit 240.
  • the shake sensor 380 detects shake of the camera system 1 due to camera shake or the like.
  • the shake sensor 380 includes an angular velocity sensor 380a and an acceleration sensor 380b.
  • the shake sensor 380 can separately detect angular shake and translational shake into an X-axis direction component, a Y-axis direction component, and a Z-axis direction component.
  • the angular velocity sensor 380a detects the angular velocity generated by the rotational movement of the camera body 2.
  • the angular velocity sensor 380a detects rotations about axes such as an axis parallel to the X axis, an axis parallel to the Y axis, and an axis parallel to the Z axis (optical axis O), and outputs a detection signal to the body side controller 230. Respectively output to.
  • the rotation detection about the axis parallel to the Z axis may be omitted.
  • the acceleration sensor 380b detects acceleration generated by the translational movement of the camera body 2.
  • the acceleration sensor 380b detects accelerations of an axis parallel to the X-axis, an axis parallel to the Y-axis, and an axis (optical axis) O parallel to the Z-axis, and outputs detection signals to the lens-side controller 330, respectively. To do.
  • FIG. 2 is a diagram showing a temporal change in the position of the focusing lens 361a in the optical axis O direction, in which the horizontal axis represents time and the vertical axis represents the focusing lens position. It is assumed that the AF mode is set to the "C" mode.
  • the body-side control unit 230 is activated. It should be noted that the body-side control unit 230 is activated in the same manner as when the main switch is turned on even when the sleep operation is canceled due to the operation member 280 being operated.
  • the activated body side control unit 230 starts power supply from the power supply unit 250 to each unit of the camera system 1 and initializes each unit of the camera body 2.
  • the lens-side control unit 330 is activated when power is supplied from the power supply unit 250, and initializes each unit of the interchangeable lens 3.
  • the initialization of the interchangeable lens 3 may include, for example, an operation of moving the focusing lens 361a to a predetermined initial position P.
  • the body-side control unit 230 instructs the image sensor 260 to start the through image shooting.
  • the image signal processing unit 270a When the image pickup device 260 starts image pickup under a predetermined image pickup condition, the image signal processing unit 270a generates and displays a through image based on the image pickup pixel signal output from the image pickup device 260, performs exposure calculation, etc.
  • the signal processing unit 270b performs focus detection processing based on the detection pixel signal output from the image sensor 260 to calculate the defocus amount.
  • the image sensor 260 is made to repeatedly capture images at a timing synchronized with the frame rate of live view image display. Then, the image signal processing unit 270a repeatedly performs through image generation, display, and exposure calculation based on the imaging pixel signal output from the image sensor 260, and performs AF signal processing based on the detection pixel signal output from the image sensor 260. The unit 270b repeatedly calculates the defocus amount. The exposure calculation result is used for shooting a through image of the next frame and for actual shooting when the release button is fully pressed. Further, based on the calculated defocus amount, an instruction to move the focusing lens 361a is transmitted. The image quality of the through image displayed on the display unit 280 may be lower than that of the image captured and recorded when the release button is fully pressed.
  • the body-side control unit 230 instructs the lens-side control unit 330 to move the focusing lens 361a by communication.
  • the lens side controller 330 sends a drive signal to the lens driver 370a to move the focusing lens 361a to the target position Q.
  • the target position Q is, for example, the position P of the focusing lens 361a at the time when the detection pixel signal is most recently acquired, and the defocus amount calculated using the detection pixel signal, based on the body side control unit. It is calculated by 230 or the lens side controller 330.
  • the movement of the focusing lens 361a to the target position Q is started after the half-press operation, it may be started when the through image shooting is started and the movement instruction of the focusing lens 361a is transmitted. ..
  • the half-push operation is continued until the full-push operation (time t4).
  • the body side control unit 230 instructs the lens side control unit 330 to start tracking.
  • Tracking in the present embodiment refers to continuing focusing on a focused main subject. Therefore, the body-side control unit 230 continues to transmit the movement instruction of the focusing lens 361a, and the lens-side control unit 330 moves the focusing lens 361a in the optical axis O direction based on the movement instruction. In the present embodiment, such a tracking operation is repeated from time t3 when it is recognized that the focusing lens 361a has reached the target position Q to time t4 when the release button is fully pressed.
  • the focus position may be deviated from the imaging surface 260S due to the movement of the subject in the optical axis O direction or the camera system 1 swinging in the optical axis O direction.
  • the movement of the focusing lens 361a (correction of the shake in the optical axis O direction) based on the detection signal of the shake sensor 380 is performed.
  • the lens-side control unit 330 determines the moving direction, the moving amount, and the moving speed of the focusing lens 361a, for example, based on the detection signal of the acceleration in the optical axis O direction detected by the shake sensor 380.
  • the lens-side control unit 330 sends a drive signal to the lens drive unit 370a based on the determination result, and moves the focusing lens 361a in the optical axis O direction.
  • the focusing lens 361a is moved based on the acceleration detection signal, thereby performing shake correction in the optical axis O direction and continuing to focus on the main subject. Will be possible.
  • the defocus amount can be calculated at intervals of about 10 milliseconds. That is, the movement of the focusing lens 361a based on the defocus amount can be performed at intervals of about 10 milliseconds.
  • the detection of the acceleration in the optical axis O direction by the shake sensor 380 can be performed at intervals of, for example, about 1 millisecond, regardless of the frame rate. That is, the movement of the focusing lens 361a based on the acceleration detection signal can be performed at an interval shorter than the detection of the defocus amount (for example, about 1 millisecond interval of 1/10).
  • the focusing lens 361a in tracking from time t3 to time t4, in addition to moving the focusing lens 361a at intervals of about 1 millisecond based on the acceleration detection signal, the focusing lens 361a is moved at intervals of about 10 milliseconds (for through images).
  • the focusing lens 361a is moved based on the defocus amount. Therefore, as compared with the case where the focusing lens 361a is moved only based on the defocus amount, it is possible to perform shake correction in the optical axis O direction and improve the followability of focusing.
  • the body-side control unit 230 instructs the image sensor 260 to perform main shooting.
  • the image sensor 260 performs, for example, main shooting under shooting conditions based on the latest exposure calculation result calculated during display of a through image.
  • the body-side control unit 230 during the actual shooting instructs the lens-side control unit 330 to start the shake correction in the optical axis O direction according to the exposure time and the like.
  • the body-side control unit 230 transmits the exposure calculation result and the like to the lens-side control unit 330, and the lens-side control unit 330 starts shake correction in the optical axis O direction as necessary.
  • the body-side control unit 230 causes the image sensor 260 to end the main shooting.
  • the image signal processing unit 270a generates an image for recording based on the image pickup pixel signals output from the image pickup device 260.
  • the body-side control unit 230 may instruct the lens-side control unit 330 to end the main photographing.
  • the lens-side control unit 330 may end the focus shake correction once with the end of the actual shooting, or may continue the acceleration detection and continue the focus shake correction.
  • FIG. 3 is an enlarged view of a part of the waveform during tracking in FIG. 2, in which the horizontal axis indicates time and the vertical axis indicates the focusing lens position.
  • Times t31, t32, t33, and t34 are between times t3 and t4 in FIG. 2, respectively, and the lens-side control unit 330 that receives the movement instruction of the focusing lens 361a based on the defocus amount from the body-side control unit 230, It is the timing to output a drive signal to the lens drive unit 370a, and is synchronized with the frame rate.
  • the double circles shown at times t31, t32, t33, and t34 are the target positions of the focusing lens 361a based on the defocus amount calculated by the body-side control unit 230 in synchronization with the above frame rate, and the first target position. Called. Even if the subject is once focused, if the subject moves in the optical axis O direction or the camera system 1 shakes in the optical axis O direction, the focus position shifts and a defocus amount occurs. Therefore, the first target position that is repeatedly calculated in synchronization with the frame rate is different at times t31, t32, t33, and t34.
  • the focusing lens 361a follows the locus indicated by the broken line 51. Specifically, the focusing lens 361a reaches the first target position after a delay time DLY from each of the times t31, t32, t33, and t34.
  • the delay time DLY corresponds to the moving time from when the lens-side control unit 330 outputs the drive signal to the lens driving unit 370a to when the focusing lens 361a actually reaches the first target position. by.
  • the black dot is the target position of the focusing lens 361a calculated by the lens side control unit 330 based on the detection signal of the acceleration in the optical axis O direction detected by the shake sensor 380, and is referred to as the second target position.
  • the lens-side control unit 330 moves the focusing lens 361a to the first target position and then further moves it to the second target position.
  • the lens-side controller 330 receives the movement instruction based on the defocus amount from the camera body 2 until the movement to the first target position is completed and the movement instruction based on the next defocus amount is received.
  • the shake correction in the optical axis O direction is performed.
  • the focusing lens 361a When the focusing lens 361a is moved to the first target position and the second target position, the focusing lens 361a follows the locus shown by the solid line 52.
  • the deviation between the second target position and the solid line 52 is the movement time from when the lens-side control unit 330 outputs the drive signal to the lens driving unit 370a until when the focusing lens 361a actually reaches the second target position. Equivalent to.
  • the lens-side control unit 330 gives priority to the first target position for focusing. The lens 361a is moved.
  • the lens-side controller 330 sets the first target position to the first target position.
  • the focusing lens 361a is moved to the target position of.
  • the lens-side control unit 330 sets the second target position until the delay time DLY elapses (until the focusing lens 361a moves to the first target position) from the times t31, t32, t33, and t34.
  • the lens-side control unit 330 may use the difference as a correction value for subsequent calculation of the second target position. Further, the lens-side control unit 330 may calculate the second target position with the first target position as the origin. When the moving amount of the focusing lens 361a based on the acceleration detection signal is a relative amount, the lens-side control unit 330 updates the origin for calculating the second target position each time the first target position is calculated. It may be done.
  • the solid line 52 that further moves the focusing lens 361a to the second target position is It can be seen that the followability of focusing is good.
  • step S10 of FIG. 4 when the camera body 2 is loaded with a battery (not shown), the body-side control unit 230 detects the operation of the main switch, which is one of the operation members 220, so that the power-on operation is performed. It is judged whether or not it is broken. When the power-on operation is detected, the body-side control unit 230 makes an affirmative decision in step S10 and the operation proceeds to step S20. When the power-on operation is not detected, the body-side control unit 230 makes a negative determination in step S10 and repeats the determination process.
  • the main switch which is one of the operation members 220
  • step S20 the body side control unit 230 starts power supply from the power supply unit 250 to each unit of the camera system 1 and proceeds to step S30.
  • step S30 the body-side control unit 230 or the lens-side control unit 330 gives an instruction to activate the shake sensor 380 (the angular velocity sensor 380a and the acceleration sensor 380b) of the interchangeable lens 3.
  • step S40 the body-side control unit 230 activates the focus detection device and proceeds to step S50.
  • the activation of the focus detection device may be, for example, an initial setting for the image sensor 260 or the signal processing unit 270.
  • step S50 the body-side control unit 230 transmits an instruction to initialize the focusing lens 361a to the interchangeable lens 3.
  • the initialization of the focusing lens 361a may be movement to the initial position P after detecting the origin position or detection of the current position.
  • step S60 the body-side control unit 230 instructs the image sensor 260 to start shooting a through image, and proceeds to step S70.
  • the body-side control unit 230 causes the image signal processing unit 270a to generate, display, and perform exposure calculation of the live view image based on the image pickup pixel signals output from the image pickup device 260.
  • the AF signal processing unit 270b calculates the defocus amount based on the detection pixel signal output from the image sensor 260.
  • the body-side control unit 230 may send an instruction to move the focusing lens 361a to the interchangeable lens 3 based on the calculated defocus amount.
  • the interchangeable lens 3 may move the focusing lens 361a by calculating a first target position (corresponding to the target position Q in FIG. 2) based on the received movement instruction.
  • step S80 the body-side control unit 230 determines whether or not the release button has been pressed halfway.
  • the body-side control unit 230 makes an affirmative decision in step S80 if a half-press operation has been performed, and proceeds to step S90 in FIG.
  • the body-side control unit 230 makes a negative decision in step S80 and returns to step S70.
  • the body-side control unit 230 causes the image signal processing unit 270a to perform generation, display, exposure calculation, and the like of the through image based on the image pickup pixel signal newly output from the image pickup element 260,
  • the AF signal processing unit 270b calculates the defocus amount based on the detection pixel signal newly output from the image sensor 260.
  • step S90 of FIG. 5 the body-side control unit 230 instructs the lens-side control unit 330 to move the focusing lens 361a, and proceeds to step S100.
  • the lens-side control unit 330 sends a drive signal to the lens drive unit 370a to move the focusing lens 361a to the first target position.
  • step S100 the body-side control unit 230 determines whether or not focus is achieved. For example, when the defocus amount calculated from the newly output detection pixel signal is within the allowable range, the body-side control unit 230 makes an affirmative decision in step S100 and proceeds to step S110. When the defocus amount exceeds the allowable range, the body-side control unit 230 makes a negative determination in step S100 and returns to step S90 to calculate the defocus amount and determine the focus at intervals based on the frame rate. To do.
  • step S110 the body-side control unit 230 determines whether the AF mode is the “S” mode or the “C” mode. When the “C” mode is set, the body-side control section 230 transmits a “C” mode tracking start instruction to the interchangeable lens 3, and proceeds to step S120. If the “S” mode is set, the body-side control unit 230 transmits a “S” mode tracking start instruction to the interchangeable lens 3, and proceeds to step S220.
  • Tracking in the “C” mode corresponds to tracking from time t3 to time t4 described with reference to FIG.
  • the body-side controller 230 sends an instruction to the lens-side controller 330 to start the shake correction in the optical axis O direction.
  • the lens-side control unit 330 calculates the second target position.
  • the lens-side control unit 330 sends a drive signal to the lens drive unit 370a to move the focusing lens 361a to the second target position.
  • step S140 the lens-side control unit 330 determines whether or not an instruction to move the focusing lens 361a based on the defocus amount from the camera body 2 is received after step S90. As described above, the calculation of the defocus amount is performed about every 10 milliseconds (the timing of the live view display). Upon newly receiving the instruction to move the focusing lens 361a, the lens-side controller 330 makes an affirmative decision in step S140 and the operation proceeds to step S150. The lens-side control unit 330 makes a negative determination in step S140 and returns to step S120 when the movement instruction for the focusing lens 361a is not newly received. After returning to step S120, the lens side control unit 330 repeatedly causes the focusing lens 361a to move (shake correction in the optical axis O direction) based on the acceleration detection signal in the optical axis O direction.
  • step S150 the lens-side control unit 330 calculates the first target position based on the movement instruction of the focusing lens 361a, and proceeds to step S160.
  • the first target position calculated in step S150 corresponds to the first target position shown in FIG.
  • step S160 the lens side controller 330 sends a drive signal to the lens driver 370a to move the focusing lens 361a to the first target position.
  • step S170 the lens-side control unit 330 determines whether or not the release button has been fully pressed to receive a signal from the camera body 2 for starting the actual shooting.
  • the lens-side control unit 330 makes an affirmative decision in step S170 if it has received the actual photographing start signal, and proceeds to step S180.
  • the lens-side controller 330 makes a negative determination in step S170 and returns to step S120. After returning to step S120, the lens-side control unit 330 continues the tracking in the “C” mode described above.
  • step S180 the body-side control unit 230 instructs the image sensor 260 to start the main shooting.
  • the image sensor 260 performs, for example, main shooting under shooting conditions based on the latest exposure calculation result calculated during display of a through image.
  • the lens-side control unit 330 follows the tracking from time t4 to time t5 described with reference to FIG. 2, in other words, moves the focusing lens 361a based on the acceleration detection signal in the optical axis O direction. Repeat.
  • step S260 the lens-side controller 330 calculates the second target position.
  • step S270 the lens-side control unit 330 sends a drive signal to the lens drive unit 370a to move the focusing lens 361a to the second target position.
  • step S280 the body-side control unit 230 determines whether or not the main shooting has ended. For example, when the exposure time of the image sensor 260 satisfies the exposure time set as the imaging condition of the main shooting, the body-side control unit 230 transmits a main shooting completion signal indicating the completion of the main shooting to the interchangeable lens 3. Affirmative determination is made in step S280 and the operation proceeds to step S290.
  • the body-side control unit 230 makes a negative determination in step S280 and returns to step S260.
  • the interchangeable lens 3 that has received the main photographing completion signal stops the shake correction in the optical axis O direction according to the AF mode. Therefore, the lens-side control unit 330 continues the movement of the focusing lens 361a based on the acceleration detection signal in the optical axis O direction until the main shooting completion signal is received in step S280.
  • step S290 the body-side control unit 230 causes the image signal processing unit 270a to perform image processing on the image pickup pixel signal output from the image pickup device 260, and proceeds to step S300.
  • step S300 the body-side control unit 230 records the image data after image processing in a storage medium (not shown) in a predetermined file format, and ends the processing in FIG.
  • Tracking in the “S” mode is similar to the tracking from time t4 to time t5 described with reference to FIG.
  • the body-side control unit 230 sends an instruction to the lens-side control unit 330 to instruct the tracking to move the focusing lens 361a based on the acceleration detection signal in the optical axis O direction.
  • the lens-side control unit 330 calculates the second target position.
  • the lens side control section 330 sends a drive signal to the lens drive section 370a to move the focusing lens 361a to the second target position.
  • step S240 the lens-side control unit 330 determines whether or not the release button has been fully pressed and a signal for starting the actual shooting has been received from the camera body 2.
  • the lens-side control unit 330 makes an affirmative decision in step S240 upon receipt of the actual shooting start signal to proceed to step S250.
  • the lens-side controller 330 makes a negative determination in step S240 if no actual image capture start signal is received, and returns to step S220. After returning to step S220, the lens-side control unit 330 causes the above-described “S” mode tracking to be continuously performed.
  • step S250 the body-side control unit 230 instructs the image sensor 260 to start the main shooting.
  • the image sensor 260 performs, for example, main shooting under shooting conditions based on the latest exposure calculation result calculated during display of a through image.
  • the processing after receiving the start signal for the main photographing is the same as the processing from step S260 to step S300 described above, and thus the description thereof is omitted.
  • the focus detection device of the present embodiment moves the focusing lens 361a using the first target position and the second target position, it suppresses the focus shake and improves the accuracy of focusing. be able to. Further, the focus detection apparatus of the present embodiment moves the focusing lens 361a to the first target position if the instruction to move the focusing lens 361a based on the defocus amount is received, and the second if the instruction to move is not received. Since the focusing lens 361a is moved to the target position of, the shake correction in the optical axis O direction can be effectively performed.
  • the first target is determined based on the first information.
  • the focus adjustment for moving the focusing lens 361a to the position can be supplemented by the focus adjustment for moving the focusing lens 361a to the second target position based on the second information.
  • the body-side control unit 230 calculates the movement amount based on the first information and not on the second information if the first information is input, it is possible to input both the first information and the second information. In some cases, focus adjustment for moving the focusing lens 361a to the first target position based on the first information can be preferentially performed.
  • the focusing lens 361a Since the AF signal processing unit 270b that detects the phase difference indicating the focus adjustment state by the imaging optical system 360 and outputs it as the first information is provided, the focusing lens 361a is moved to the first target position based on the first information. The moving focus can be adjusted accurately.
  • the focusing lens 361a Since the shake sensor 380 that detects at least the shake of the imaging optical system 360 in the optical axis O direction and outputs it as the second information is provided, the focusing lens 361a is moved to the first target position based on the first information.
  • the gap between the focus adjustments can be compensated by the focus adjustment for moving the focusing lens 361a to the second target position based on the shake in the optical axis O direction.
  • the movement amount of the focusing lens 361a may be limited.
  • a predetermined threshold value that limits the amount of movement of the focusing lens 361a that moves to the second target position in shake correction in the optical axis O direction may be set.
  • the moving amount of the focusing lens 361a that moves to the second target position in the shake correction in the optical axis O direction is calculated based on the moving instruction (defocus amount) received from the camera body 2. It may be limited so as not to exceed the movement amount of the focusing lens 361a that moves to the target position.
  • the movement amount of the focusing lens 361a that moves to the second target position in the shake correction in the optical axis O direction is calculated based on at least one movement instruction received before that. It may be limited so as not to exceed the moving amount of the focusing lens 361a that moves to.
  • the limit value of the moving amount of the focusing lens 361a that moves to the second target position may be set by multiplying the moving amount of the focusing lens 361a that moves to the first target position by a coefficient. Further, the limit value of the moving amount of the focusing lens 361a that moves to the second target position may be set according to the depth of focus of the image pickup optical system 360.
  • FIG. 6 is a diagram showing a temporal change in the position of the focusing lens 361a in the optical axis direction in Modification 1, and is an enlarged view of a time zone similar to FIG.
  • the second target position indicated by a black dot exceeds the range ⁇ on the near side of the first target position.
  • the lens-side control unit 330 limits the amount of movement of the focusing lens 361a when the second target position exceeds the range ⁇ to ⁇ .
  • the focusing lens 361a follows the locus shown by the solid line 52, and the movement amount of the focusing lens 361a is limited to the range ⁇ closer to the first target position, as indicated by the symbol Q1.
  • the range ⁇ may be a value set by the lens side controller 330.
  • the lens-side control unit 330 sets the range ⁇ as a fixed value while one half-press is continued (time t3 to t4), but every time the first target position is calculated.
  • the range ⁇ may be changed.
  • the lens-side control unit 330 makes the range ⁇ set at time t31, the range ⁇ set at time t32, the range ⁇ set at time t33, and the range ⁇ set at time t34 different from each other.
  • the range ⁇ may be a value corresponding to the distance to the first target position.
  • the amount of movement to the first target position at time t33 is greater than the amount of movement to the first target position at time t31, so the range ⁇ between times t33 and t34 is between times t31 and t32. It may be set larger than the range ⁇ . Further, the range ⁇ may be made different between half-pressing and full-pressing.
  • the lens-side control unit 330 may set the range ⁇ during full pressing to be smaller than the range ⁇ during half pressing.
  • the lens-side control unit 330 may also perform shake correction in the optical axis O direction even during a through image. Further, although the range ⁇ is set to the close side and the infinite side with the first target position as the center, the range may be different between the close side and the infinite side.
  • FIG. 7 is a diagram showing a temporal change in the position of the focusing lens 361a in the optical axis direction in Modification 2, and is an enlarged view of a time zone similar to FIG.
  • the second target position indicated by a black dot exceeds the range ⁇ on the near side of the first target position twice in a row.
  • the lens-side controller 330 suspends the movement of the focusing lens 361a to the second target position when the second target position exceeds the range ⁇ twice in a row. This suspension is continued until the detection result of the shake sensor 380 does not exceed the range ⁇ a predetermined number of times, for example, after the time t33 when the next movement instruction is received after the suspension.
  • the lens-side control unit 330 restarts the movement of the focusing lens 361a to the second target position at time t34 when the next movement instruction is received.
  • the time and conditions until resumption can be changed as appropriate.
  • the focusing lens 361a follows the locus indicated by the solid line 52, and as indicated by the symbol Q2, the movement amount of the focusing lens 361a is the first target calculated based on the movement instruction received immediately before. You are restricted not to be too far from the position.
  • the lens-side control unit 330 calculates the amount of movement based on the first information.
  • the predetermined range centered on the first target position (range ⁇ , range ⁇ on the near side and the infinity side with respect to the first target position) is restricted so as not to exceed.
  • the interval between focus adjustments for moving the focusing lens 361a to the first target position based on the defocus amount as the first information is converted into the acceleration detection signal in the optical axis O direction as the second information.
  • the compensation can be appropriately performed.
  • the moving range and the center of the focusing lens 361a that moves to the second target position may be calculated in consideration of the history of movement instructions. Further, the history of the change of the first target position calculated based on the movement instruction may be taken into consideration.
  • the lens-side control unit 330 may perform shake correction (movement to the second target position) in the optical axis O direction when the transmission cycle of the movement instruction from the camera body 2 is long.
  • the F value depending on the aperture diameter of the diaphragm member
  • the lens-side control unit 330 detects a large shake in the optical axis O direction, the lens-side control unit 330 determines that the composition has changed, such as movement of the subject, and temporarily stops the movement to the second target position. It may be possible to wait for the calculation of the first target position.
  • the first information that is the basis of the first target position is calculated by the body-side control unit 230 and is input to the lens-side control unit 330 that functions as the first input unit.
  • the second information that is the basis of the second target position is input to the lens-side control unit 330 that functions as the second input unit. That is, the camera body 2 calculates the defocus amount, the interchangeable lens 3 calculates the moving amount of the focusing lens 361a based on the defocus amount, and the moving amount of the focusing lens 361a based on the shake in the optical axis O direction. However, it can be changed appropriately.
  • the camera body 2 may calculate the amount of movement of the focusing lens 361a based on the defocus amount, and the interchangeable lens 3 may finely adjust the amount of movement transmitted from the camera body 2.
  • the interchangeable lens 3 is used to calculate the movement amount of the focusing lens 361a based on the shake in the optical axis O direction.
  • the movement amount of the focusing lens 361a based on the shake in the optical axis O direction is calculated on the camera body 2 side.
  • the moving amount of the focusing lens 361a in consideration of both the defocus amount and the shake in the optical axis O direction on the camera body 2 side may be calculated and transmitted to the interchangeable lens 3.
  • the shake sensor 380 may be provided in the camera body 2.
  • the shake sensor 380 may be arranged on both the camera body 2 and the interchangeable lens 3. Further, the example in which the shake sensor 380 functioning as an acceleration detection unit has a plurality of detection axes has been described, but the shake sensor 380 may be any one that detects at least shake in the optical axis O direction. Furthermore, an example has been described in which the shake sensor 380 has a function of detecting an angular velocity, but the shake sensor 380 may be any one that detects at least acceleration in the optical axis O direction. Further, the shake sensor 380 may be configured by a sensor other than the gyro sensor and the acceleration sensor.
  • SYMBOLS 1 ... Camera system, 2 ... Camera body, 3 ... Interchangeable lens, 230 ... Body side control part, 260 ... Image sensor, 270b ... AF signal processing part, 330 ... Lens side control part, 360 ... Imaging optical system, 361a ... Focusing Lens, O ... Optical axis

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  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Studio Devices (AREA)
  • Adjustment Of Camera Lenses (AREA)
  • Structure And Mechanism Of Cameras (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)
PCT/JP2019/042206 2018-10-29 2019-10-28 演算装置、交換レンズ、カメラボディおよび撮像装置 Ceased WO2020090751A1 (ja)

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JP2007199668A (ja) * 2005-11-25 2007-08-09 Seiko Epson Corp 撮像装置、撮像装置の制御方法および制御プログラム
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US20220201215A1 (en) 2022-06-23
JP2020071265A (ja) 2020-05-07

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