WO2009139192A1 - カメラシステム - Google Patents
カメラシステム Download PDFInfo
- Publication number
- WO2009139192A1 WO2009139192A1 PCT/JP2009/002162 JP2009002162W WO2009139192A1 WO 2009139192 A1 WO2009139192 A1 WO 2009139192A1 JP 2009002162 W JP2009002162 W JP 2009002162W WO 2009139192 A1 WO2009139192 A1 WO 2009139192A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lens
- interchangeable lens
- driving
- command
- camera body
- Prior art date
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
- G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
Definitions
- the present invention relates to a camera system, and more particularly to a camera system including an interchangeable lens and a camera body.
- Patent Document 1 discloses a camera system including a camera body and an interchangeable lens. This camera system performs autofocus control by transmitting a command for controlling driving of the interchangeable lens from the camera body to the interchangeable lens.
- Patent Document 1 does not disclose any technique for shifting from autofocus control to another control.
- An object of the present invention is to provide a camera system capable of smoothly shifting from drive control of a movable member in an interchangeable lens to other control in a camera system.
- a camera system having an interchangeable lens and a camera body.
- the camera body includes body control means for generating a command and transmission means for transmitting the generated command to the interchangeable lens.
- the interchangeable lens includes a movable member, a driving unit that drives the movable member, a receiving unit that receives a command from the camera body, and a lens control unit that controls the driving unit according to the received command.
- a predicting unit that predicts whether or not the operation of the driving unit of the interchangeable lens according to the received command is completed within a predetermined period is provided in either the camera body or the interchangeable lens.
- a camera body in which an interchangeable lens having a movable member and a driving means for driving the movable member can be attached.
- the camera body determines whether or not the operation of the body control means for generating the command, the transmission means for transmitting the generated command to the interchangeable lens, and the drive means according to the command transmitted in the interchangeable lens is completed within a predetermined period.
- an interchangeable lens that can be attached to a camera body.
- the interchangeable lens controls the movable member, the driving means for driving the movable member, the receiving means for receiving the synchronization signal and the command from the camera body, and the driving means in accordance with the received command in synchronization with the received synchronization signal.
- a camera body in which an interchangeable lens having a movable member and a driving means for driving the movable member can be attached.
- the camera body transmits the command based on the state of the body control means for generating the command, the transmission means for transmitting the generated command to the interchangeable lens, the reception means for receiving the state of the movable member from the interchangeable lens, and the state of the movable member.
- Prediction means for predicting whether or not the operation of the drive means for the interchangeable lens according to the command is completed within a predetermined period.
- a camera system having an interchangeable lens and a camera body.
- the camera body includes body control means for generating a synchronization signal and a command, and transmission means for transmitting the generated synchronization signal and command to the interchangeable lens.
- the interchangeable lens controls the driving means according to the received command in synchronization with the movable member, the driving means for driving the movable member, the receiving means for receiving the synchronization signal and the command from the camera body, and the received synchronization signal.
- a lens control unit and a prediction unit that predicts whether or not the operation of the driving unit according to the received command is completed within a predetermined period.
- the lens control means transmits the prediction result by the prediction means to the camera body.
- the prediction result is information indicating the number of cycles of the synchronization signal required until the operation of the driving unit according to the received command is completed.
- the present invention it is possible to provide a camera system capable of smoothly shifting from drive control of a movable member in an interchangeable lens to other control in a camera system.
- Block diagram of camera system 1 Chart for explaining imaging preparation operation Flow chart for explaining autofocus operation
- Embodiment 1 Hereinafter, a first embodiment when the present invention is applied to an interchangeable lens camera system will be described with reference to the drawings.
- FIG. 1 is a block diagram showing a configuration of a camera system 1 according to Embodiment 1 of the present invention.
- the camera system 1 includes a camera body 100 and an interchangeable lens 200 that can be attached to and detached from the camera body 100.
- the camera system 1 can perform autofocus control by driving the focus lens 230. Further, the camera system 1 can perform aperture control by driving the aperture 260.
- a configuration for smoothly shifting from a control for driving a movable member such as autofocus control or aperture control to another control in a lens-interchangeable camera system will be described.
- the camera body 100 includes a CCD image sensor 110, a liquid crystal monitor 120, a camera controller 140, a body mount 150, a power source 160, and a card slot 170.
- the camera controller 140 controls the entire camera system 1 by controlling components such as the CCD image sensor 110 in response to an instruction from an operation member such as the release button 130.
- the camera controller 140 transmits a vertical synchronization signal to the timing generator 112. In parallel with this, the camera controller 140 generates an exposure synchronization signal based on the vertical synchronization signal.
- the camera controller 140 periodically transmits the generated exposure synchronization signal to the lens controller 240 via the body mount 150 and the lens mount 250.
- the camera controller 140 uses the DRAM 141 as a work memory during control operations and image processing operations.
- the CCD image sensor 110 captures a subject image incident through the interchangeable lens 200 and generates image data.
- the generated image data is digitized by the AD converter 111.
- the image data digitized by the AD converter 111 is subjected to predetermined image processing by the camera controller 140.
- the predetermined image processing includes, for example, gamma correction processing, white balance correction processing, scratch correction processing, YC conversion processing, electronic zoom processing, and JPEG compression processing.
- the CCD image sensor 110 operates at a timing controlled by the timing generator 112.
- the operation of the CCD image sensor 110 includes a still image capturing operation, a through image capturing operation, and the like.
- the through image is mainly a moving image, and is displayed on the liquid crystal monitor 120 in order for the user to determine a composition for capturing a still image.
- the liquid crystal monitor 120 displays an image indicated by the display image data processed by the camera controller 140.
- the liquid crystal monitor 120 can selectively display both moving images and still images.
- the memory card 171 can be inserted into the card slot 170, and the memory card 171 is controlled based on the control from the camera controller 140.
- the memory card 171 can store image data generated by image processing of the camera controller 140.
- the memory card 171 can store a JPEG image file.
- the image data or image file stored in the memory card 171 can be read, and the image data or image file read from the memory card 171 is subjected to image processing by the camera controller 140.
- the camera controller 140 decompresses the image data or image file acquired from the memory card 171 and generates display image data.
- the power source 160 supplies power for consumption by the camera system 1.
- the power source 160 may be, for example, a dry battery or a rechargeable battery.
- the power supply 160 may supply power to the camera system 1 from the outside via a power cord.
- the body mount 150 can be mechanically and electrically connected to the lens mount 250 of the interchangeable lens 200.
- the body mount 150 can transmit and receive data to and from the interchangeable lens 200 via the lens mount 250.
- the body mount 150 transmits the exposure synchronization signal received from the camera controller 140 to the lens controller 240 via the lens mount 250. Further, other control signals received from the camera controller 140 are transmitted to the lens controller 240 via the lens mount 250. For example, information related to driving of the focus lens 230 received from the camera controller 140 is transmitted to the lens controller 240 via the lens mount 250.
- the body mount 150 transmits a signal received from the lens controller 240 via the lens mount 250 to the camera controller 140.
- the body mount 150 transmits to the camera controller 140 a completion notice signal for notifying completion of movement of the focus lens 230 received from the lens controller 240 via the lens mount 250. Further, the body mount 150 supplies the power received from the power supply 160 to the entire interchangeable lens 200 via the lens mount 250.
- the interchangeable lens 200 includes an optical system, a lens controller 240, and a lens mount 250.
- the optical system includes a zoom lens 210, an OIS lens 220, an aperture 260, and a focus lens 230.
- the zoom lens 210 is a lens for changing the magnification of the subject image formed by the optical system.
- the zoom lens 210 is composed of one or a plurality of lenses.
- the drive mechanism 211 includes a zoom ring or the like that can be operated by the user, transmits the operation by the user to the zoom lens 210, and moves the zoom lens 210 along the optical axis direction of the optical system.
- the detector 212 detects the drive amount in the drive mechanism 211.
- the lens controller 240 can grasp the zoom magnification in the optical system by acquiring the detection result in the detector 212.
- the OIS lens 220 is a lens for correcting blurring of a subject image formed by the optical system of the interchangeable lens 200.
- the OIS lens 220 moves in a direction that cancels out the blur of the camera system 1, thereby reducing the blur of the subject image on the CCD image sensor 110.
- the OIS lens 220 is composed of one or a plurality of lenses.
- the actuator 221 drives the OIS lens 220 in a plane perpendicular to the optical axis of the optical system under the control of the OIS IC 223.
- the actuator 221 can be realized by a magnet and a flat coil, for example.
- the position detection sensor 222 is a sensor that detects the position of the OIS lens 220 in a plane perpendicular to the optical axis of the optical system.
- the position detection sensor 222 can be realized by a magnet and a Hall element, for example.
- the OIS IC 223 controls the actuator 221 based on the detection result of the position detection sensor 222 and the detection result of a shake detector such as a gyro sensor.
- the OIS IC 223 obtains the detection result of the shake detector from the lens controller 240. Further, the OIS IC 223 transmits a signal indicating the state of the optical image blur correction process to the lens controller 240.
- the diaphragm 260 is a member for adjusting the amount of light passing through the optical system.
- the diaphragm 260 includes, for example, a plurality of diaphragm blades, and the amount of light can be adjusted by opening and closing an opening formed by the blades.
- the diaphragm motor 261 is a driving unit for opening and closing the opening of the diaphragm 260.
- the focus lens 230 is a lens for changing the focus state of the subject image formed on the CCD image sensor 110 by the optical system.
- the focus lens 230 is composed of one or a plurality of lenses.
- the focus motor 233 drives the focus lens 230 to advance and retract along the optical axis of the optical system based on the control of the lens controller 240. Thereby, the focus state of the subject image formed on the CCD image sensor 110 by the optical system can be changed.
- a stepping motor is used as the focus motor 233.
- the present invention is not limited to this. In short, any lens driving device capable of moving the focus lens 230 by a predetermined amount within a predetermined time may be used.
- the focus motor 233 is composed of a stepping motor, the lens controller 240 can detect the drive amount of the focus lens 230 by counting the number of pulse signals transmitted by the lens controller 240 with the counter 243.
- the lens controller 240 controls the entire interchangeable lens 200 such as the OIS IC 223 and the focus motor 233 based on the control signal from the camera controller 140.
- the lens controller 240 controls the focus motor 233 based on a control signal from the camera controller 140 so that the focus lens 230 is advanced and retracted along the optical axis by a predetermined driving method.
- signals are received from the detector 212, the OIS IC 223, and the like, and transmitted to the camera controller 140.
- the lens controller 240 performs the transmission / reception with the camera controller 140 via the lens mount 250 and the body mount 150.
- the lens controller 240 uses the DRAM 241 as a work memory at the time of control.
- the flash memory 242 stores programs and parameters used when the lens controller 240 is controlled.
- the camera controller 140 is an example of a body control means.
- the body mount 150 is an example of a transmission unit and a reception unit.
- the focus lens 230 and the diaphragm 260 are examples of movable members.
- the focus motor 233 and the aperture motor 261 are examples of driving units, respectively.
- the lens mount 250 is an example of a receiving unit and a transmitting unit.
- the lens controller 240 is an example of a lens control unit.
- the camera controller 140 and the lens controller 240 are examples of prediction means.
- FIG. 2 is a diagram illustrating signal transmission / reception for explaining the imaging preparation operation in the camera system 1.
- the power supply 160 supplies power to the interchangeable lens 200 via the body mount 150 and the lens mount 250 ( S11).
- the camera controller 140 requests authentication information of the interchangeable lens 200 from the lens controller 240 (S12).
- the authentication information of the interchangeable lens 200 includes information regarding whether or not the interchangeable lens 200 is mounted and information regarding whether or not an accessory is mounted.
- the lens controller 240 responds to the lens authentication request from the camera controller 140 (S13).
- the camera controller 140 requests the lens controller 240 to perform an initialization operation (S14).
- the lens controller 240 performs initialization operations such as resetting the aperture and resetting the OIS lens 220.
- the lens controller 240 returns to the camera controller 140 that the lens initialization operation has been completed (S15).
- the camera controller 140 requests lens data from the lens controller 240 (S16).
- the lens data is stored in the flash memory 242. Therefore, the lens controller 240 reads the lens data from the flash memory 242 and sends it back to the camera controller 140 (S17).
- the lens data includes characteristic values peculiar to the interchangeable lens 200 such as a lens name, an F number, and a focal length.
- the camera controller 140 grasps the lens data of the interchangeable lens 200 mounted on the camera body 100, the camera controller 140 is ready for imaging.
- the camera controller 140 periodically requests lens state data indicating the state of the interchangeable lens 200 from the lens controller 240 (S18).
- the lens state data includes, for example, zoom magnification information by the zoom lens 210, position information of the focus lens 230, aperture value information, and the like.
- the lens controller 240 returns the requested lens state data to the camera controller 140 (S19).
- the auto focus control of the camera system 1 will be described with reference to the flow of FIG. 3 and FIG.
- the camera system 1 employs a contrast method (so-called hill-climbing method) autofocus control.
- a contrast method so-called hill-climbing method
- a case where the camera body 100 moves the focus lens 230 to the in-focus position after detecting the in-focus position of the focus lens 230 in the contrast-type autofocus control will be described.
- a method of detecting the focus position of a focus lens when performing contrast-type autofocus control in an interchangeable lens camera system is generally known (see, for example, JP-A-2007-322922). The description here is omitted.
- the camera system 1 drives the focus lens 230 to start detecting a focal point (S21).
- the camera controller 140 acquires the current position information of the focus lens 230 from the lens controller 240, and calculates a movement amount to move the focus lens 230 (S22). When the movement amount is calculated, the camera controller 140 transmits a command related to the movement amount of the focus lens 230 to the lens controller 240 via the body mount 150 and the lens mount 250 (S23, time t1).
- the camera controller 140 is not necessarily configured to transmit the movement amount to the lens controller 240.
- the camera controller 140 is configured to transmit position information on the optical axis to which the focus lens 230 is to be moved to the lens controller 240. May be.
- the lens controller 240 controls the focus motor 233 to move the focus lens 230 based on the acquired command (S24, time t2). This control is performed in synchronization with the exposure synchronization signal transmitted next to the exposure synchronization signal when the command related to the movement amount is transmitted. Thereby, the transition to the control of the focus motor 233 is smoothly performed from the time of command acquisition.
- the lens controller 240 simultaneously starts an autofocus drive completion prediction flag (hereinafter referred to as “AF completion prediction flag”) and an autofocus drive completion flag (hereinafter referred to as “AF completion flag”). (Set to OFF) (time t2 in FIG. 5).
- the lens controller 240 does not necessarily have a configuration in which the AF completion prediction flag and the AF completion flag are lowered simultaneously with the start of the movement of the focus lens 230.
- the AF completion prediction flag and the AF completion flag are simultaneously acquired with the command acquisition. May be configured to fall.
- the AF completion prediction flag is a flag for notifying that the autofocus operation will be completed within a predetermined time from the present time.
- the predetermined time is set to a period equivalent to a period (one frame period) required for the CCD image sensor 110 to capture an image of one frame.
- One frame period corresponds to a vertical transfer period of the CCD image sensor 110, for example.
- the AF completion flag is a flag indicating that the autofocus operation is actually completed.
- the camera controller 140 and the lens controller 240 exchange commands relating to driving of the focus lens 230 and the like.
- This command exchange is performed at a timing synchronized with an exposure synchronization signal transmitted from the camera controller 140 to the lens controller 240.
- the interchangeable lens 200 transmits a command including information on the current position of the focus lens 230, the current position of the zoom lens 210, the aperture state of the aperture 260, and the status of various flags to the camera body 100.
- the camera body 100 transmits a command including information related to the target position of the focus lens 230 and a command including information related to the driving speed of the focus lens 230 to the interchangeable lens 200.
- the lens controller 240 counts the number of pulse signals transmitted to the focus motor 233 with the counter 243 after starting the movement of the focus lens 230. Thereby, it is possible to detect the driving state such as the current position and driving speed of the focus lens 230.
- the lens controller 240 determines (predicts) whether or not the movement of the focus lens 230 is completed within a predetermined time from the current time (S25). That is, it is determined whether or not the remaining moving amount at the present time is an amount that can move within a predetermined time (S25).
- the predetermined time is set to one frame period.
- the lens controller 240 determines whether or not the operation of the focus lens 230 is completed in the period of the next exposure synchronization signal. Whether or not the movement of the focus lens 230 is completed within a predetermined time can be determined by grasping the driving speed of the focus lens 230 and the count state of the counter 243.
- the lens controller 240 raises an AF completion prediction flag for notifying that the autofocus operation is completed within the predetermined time (S26, S26).
- S26, S26 the predetermined time
- the camera controller 140 receives the AF completion prediction flag from the lens controller 240, and can detect that the autofocus operation will be completed within a predetermined time based on the AF completion prediction flag. Note that at this time of determination, since the completion of the movement of the focus lens 230 is only predicted, the actual movement of the focus lens 230 is not completed.
- the lens controller 240 can determine whether or not the movement of the focus lens 230 is completed within a predetermined time from the current time.
- a focus motor an interchangeable lens having a motor (for example, a DC motor) that cannot determine whether or not driving of the focus lens is completed within a predetermined time from the present time is mounted on the camera body 100 of the present embodiment. Cases are also conceivable. In such a configuration, the lens controller 240 does not raise the AF completion prediction flag before AF is completely completed.
- the camera controller 140 When the AF completion prediction flag is received from the lens controller 240, the camera controller 140 causes the lens controller 240 to pass through the body mount 150 and the lens mount 250, and the target aperture value in the aperture control that is executed following the autofocus control.
- the command including the information on is transmitted (S27, time t4 in FIG. 5).
- the lens controller 240 When the lens controller 240 receives a command including information on the target aperture value, the lens controller 240 controls the aperture motor 261 to start driving the aperture 260 at the next synchronous drive timing (S28, time t5 in FIG. 5).
- the lens controller 240 lowers (sets to OFF) the aperture drive completion prediction flag and the aperture drive completion flag simultaneously with the start of driving of the aperture 260.
- the aperture drive completion prediction flag is a flag for notifying that the aperture drive will be completed within a predetermined time from the present time.
- the predetermined time is a period equivalent to a period (one frame period) required for the CCD image sensor 110 to capture an image of one frame, and corresponds to a vertical transfer period of the CCD image sensor 110, for example.
- the aperture drive completion flag is a flag indicating that the aperture drive is actually completed. In this embodiment, each time the aperture driving is performed, the aperture driving completion prediction flag and the aperture driving completion flag are lowered (set to OFF).
- the lens controller 240 does not necessarily have a configuration in which the aperture drive completion prediction flag and the aperture drive completion flag are lowered simultaneously with the start of driving of the aperture 260.
- the aperture drive completion prediction flag and the aperture drive are simultaneously acquired with the command acquisition.
- the configuration may be such that the completion flag is lowered.
- the lens controller 240 raises (sets to ON) an AF completion flag indicating that the movement of the focus lens 230 is completed (S29, time in FIG. 5). t6).
- the camera controller 140 receives the AF completion flag via the lens mount 250 and the body mount 150, and can detect that the movement of the focus lens 230 has been completed by referring to the AF completion flag.
- an interchangeable lens having a motor for example, a DC motor
- the AF completion prediction flag and the AF completion flag are simultaneously raised (set to ON) at time t6.
- the camera body 100 can cope with both an interchangeable lens that can predict the completion of the autofocus operation in advance and an interchangeable lens that cannot predict the completion of the autofocus operation in advance.
- the autofocus operation is predicted and detected to be completed within a predetermined time.
- an AF completion prediction flag is raised.
- the interchangeable lens 200 can notify the camera body 100 that the autofocus operation is completed within a predetermined time from the present time.
- the camera body 100 can instruct other control before the autofocus operation is completed.
- the camera body 100 notifies the interchangeable lens 200 of a command including information on the target aperture value at the next command transmission timing after acquiring the AF completion prediction flag.
- the interchangeable lens 200 can shift to the driving operation of the diaphragm 260 immediately after the completion of the autofocus operation.
- the camera system according to the present embodiment can smoothly shift from autofocus control to the next control.
- the camera controller 140 cannot shift to the next control until it actually detects completion of the autofocus operation. Therefore, the camera controller 140 must transmit a command including information regarding the target aperture value in the aperture control to the lens controller 240 after the time t6 when the completion of the autofocus operation is actually detected, that is, at the time t7. . In that case, the lens controller 240 controls the aperture motor 261 in the next cycle of the exposure synchronization cycle (control cycle) including the time t7 when the command including information on the target aperture value in the aperture control is received, that is, at the time t8. Start.
- the start of aperture driving is delayed by (t8 ⁇ t5).
- an AF completion prediction flag is provided, and the completion of the autofocus operation is predicted with reference to the AF completion prediction flag, so that the next control is started before the movement of the focus lens 230 is actually completed. It is possible to transfer control of the camera system 1 by the camera controller 140 at an early stage.
- the lens controller 240 determines whether or not the driving of the aperture 260 to the target aperture value is completed within a predetermined period (S31).
- the predetermined time is a period equivalent to one frame period.
- the lens controller 240 raises (sets to ON) the diaphragm driving completion prediction flag (S33, time t9). Thereby, the camera controller 140 can detect that the aperture driving will be completed within a predetermined period by referring to the aperture driving completion prediction flag.
- the camera controller 140 prepares for an exposure operation by the CCD image sensor 110 (S33). When the preparation for the exposure operation is completed, the camera controller 140 causes the CCD image sensor 110 to start the exposure operation at the next operation timing (S34, time t10).
- the lens controller 240 raises (sets to ON) the aperture drive completion flag at the next command transmission timing (S35, time t11). Thereby, the camera controller 140 can detect that the aperture driving is completed via the lens mount 250 and the body mount 150.
- the camera controller 140 performs an exposure operation on the CCD image sensor 110 continuously (S36).
- the interchangeable lens 200 can notify the camera body 100 that the aperture driving is completed within a predetermined time from the current time by the aperture drive completion prediction flag. As a result, the camera body 100 can start preparation for another control before the aperture driving is actually completed, and can smoothly shift to another control.
- the camera body 100 can start preparing the exposure operation for the CCD image sensor 110 without waiting for the actual completion of the aperture drive. Thereby, the camera body 100 can shift to the exposure operation by the CCD image sensor 110 immediately after the completion of the actual aperture driving, and as a result, the transition from the aperture driving control to the next control can be performed smoothly. Can do.
- the camera controller 140 when the aperture drive completion prediction flag is not provided, the camera controller 140 cannot move to the next control unless it detects actual completion of the aperture drive. Therefore, in the example of FIG. 5, the camera controller 140 starts preparation for the exposure operation after time t11 when it can be detected that the driving of the diaphragm 260 is actually completed, and the start timing of the exposure operation is also the timing after time t11. (For example, time t12).
- preparation for the exposure operation can be started after time t9 as described above, and the exposure operation can be started early (time t10).
- the start of the exposure operation is delayed by (t12 ⁇ t10) compared to the case where the aperture drive completion prediction flag is provided.
- a flag (completion prediction flag) indicating a prediction result of the completion of driving of the optical member such as an AF completion prediction flag and an aperture driving completion prediction flag, as well as an AF completion flag and an aperture driving completion flag
- a flag (completion flag) indicating that the driving of the optical member is actually completed is set.
- Such a completion flag makes it possible to accurately grasp the state of the optical member. Therefore, the completion flag is useful when switching from synchronous control to asynchronous control between the camera body 100 and the interchangeable lens 200 or performing asynchronous processing between the camera body 100 and the interchangeable lens 200.
- the stationary state of the optical member can be accurately grasped by referring to the completion flag. After confirming the stationary state, the synchronous control is switched to asynchronous control. It is possible to switch.
- an AF completion prediction flag and an aperture drive completion prediction flag are set to notify the camera body 100 from the interchangeable lens 200 that the drive of the focus lens 230 and the diaphragm 260 is completed.
- any type of information may be used as long as the interchangeable lens 200 can notify the camera body 100 that the driving of the focus lens 230 is completed.
- information for notifying that the driving of the focus lens 230 and the diaphragm 260 is completed information (seconds) indicating the elapsed time required to complete driving, information indicating the number of frames required to complete driving, and prediction Information indicating the timing of driving completion may be used.
- the prediction flag is set in the interchangeable lens 200, but the prediction flag may be set in the camera body 100.
- the camera controller 140 may operate as follows. In the imaging preparation operation, the camera controller 140 acquires information regarding the driving speed for each of the focus lens 230 and the diaphragm 260 included in the lens data from the lens controller 240. The camera controller 140 acquires information regarding the current position of the focus lens 230 and the opening of the aperture 260 from the lens controller 240 before performing autofocus control and aperture control. Then, the camera controller 140 determines whether or not the movement of the focus lens 230 is completed within a predetermined time from the current time based on the drive speed of the focus lens 230 acquired in the imaging preparation operation and the current position of the focus lens 230. Is determined (predicted), and an AF completion prediction flag is set. Similarly, the camera controller 140 sets an aperture drive completion flag based on the drive speed of the aperture 260 acquired in the imaging preparation operation and the current opening.
- the predetermined time used for the prediction of the drive completion is set as one frame period, but the present invention is not limited to this.
- the configuration is such that the aperture control is performed after the autofocus control, but such a configuration is not necessarily required. Following the autofocus control, the autofocus control may be performed again or the exposure operation may be performed.
- the focus lens 230 and the diaphragm 260 are illustrated as targets for predicting the completion of driving, but such a configuration is not necessarily required.
- the idea of Embodiment 1 can be applied to any movable member that can be driven.
- the AF completion flag and the aperture drive completion flag are set to ON after the driving of the movable member is completed.
- a configuration is not necessarily required. If the AF completion prediction flag and the aperture drive completion prediction flag are set to ON, the AF completion flag and the aperture drive completion flag do not necessarily have to be set to ON.
- the configuration including the zoom lens 210 and the OIS lens 220 is illustrated, but these are not essential elements. That is, the idea of Embodiment 1 can be applied to a camera system equipped with a single focus lens that does not have a zoom function. The idea of the first embodiment can also be applied to a camera system equipped with an interchangeable lens that does not have a camera shake correction function.
- a camera body that does not include a movable mirror is illustrated, but the configuration of the camera body is not limited to this.
- a movable mirror may be provided in the camera body, or a prism for separating the subject image may be provided.
- the structure provided with a movable mirror not in a camera body but in an adapter may be sufficient.
- the CCD image sensor 110 is exemplified as the image sensor, but the image sensor is not limited to this.
- the imaging device may be configured with a CMOS image sensor or an NMOS image sensor.
- the present invention can be applied to an interchangeable lens camera system. Specifically, it can be applied to a digital still camera or a movie.
- Camera System 100 Camera Body 110 CCD Image Sensor 112 Timing Generator 130 Release Button 140 Camera Controller 200 Interchangeable Lens 230 Focus Lens 233 Focus Motor 240 Lens Controller 260 Aperture
Abstract
Description
以下、本発明をレンズ交換式のカメラシステムに適用した場合の実施の形態1について図面を用いて説明する。
1-1-1.概要
図1は、本発明の実施の形態1に係るカメラシステム1の構成を示すブロック図である。カメラシステム1は、カメラボディ100とそれに着脱可能な交換レンズ200とから構成される。カメラシステム1は、フォーカスレンズ230を駆動することにより、オートフォーカス制御を行うことができる。また、カメラシステム1は、絞り260を駆動することにより、絞り制御を行うことができる。本実施の形態では、レンズ交換式のカメラシステムにおいて、オートフォーカス制御や絞り制御といった可動部材を駆動する制御から、他の制御への移行をスムーズに行うための構成を説明する。
カメラボディ100は、CCDイメージセンサ110と液晶モニタ120とカメラコントローラ140とボディマウント150と電源160とカードスロット170とを備える。
交換レンズ200は、光学系とレンズコントローラ240とレンズマウント250とを備える。光学系はズームレンズ210、OISレンズ220、絞り260、フォーカスレンズ230を含む。
カメラコントローラ140はボディ制御手段の一例である。ボディマウント150は、送信手段及び受信手段の一例である。フォーカスレンズ230と絞り260とは、それぞれ可動部材の一例である。フォーカスモータ233と絞りモータ261とは、それぞれ駆動手段の一例である。レンズマウント250は、受信手段及び送信手段の一例である。レンズコントローラ240はレンズ制御手段の一例である。カメラコントローラ140及びレンズコントローラ240は予測手段の一例である。
1-2-1.撮像準備動作
まず、撮像準備のためのカメラシステム1の動作を説明する。図2は、カメラシステム1における撮像準備動作を説明するための信号送受信を示した図である。
以上のようにして撮像準備が完了したカメラシステム1におけるオートフォーカス制御と絞り制御について図3~図5を用いて説明する。本実施形態では、まずオートフォーカス制御が実行され、それに続いて絞り制御が行われるとする。
図3のフロー及び図5を参照しながら、カメラシステム1のオートフォーカス制御について説明する。なお、カメラシステム1は、コントラスト方式(いわゆる山登り方式)のオートフォーカス制御を採用している。コントラスト方式のオートフォーカス制御において、カメラボディ100がフォーカスレンズ230の合焦位置を検出後、フォーカスレンズ230を合焦位置に移動する場合について説明する。なお、レンズ交換式のカメラシステムにおいてコントラスト方式のオートフォーカス制御を行う際に、フォーカスレンズの合焦位置を検出する方法は一般に知られているため(例えば、特開2007-322922号公報参照)、ここでの説明を省略する。
上記のオートフォーカス動作の完了後に続けて行われる絞り制御について図4のフローチャート及び図5を参照しながら説明する。
実施の形態1では、交換レンズ200からカメラボディ100に対して、フォーカスレンズ230や絞り260の駆動が完了することを通知するためにAF完了予測フラグや絞り駆動完了予測フラグを用いたが、必ずしもこのような情報に限定されるものではない。すなわち、フォーカスレンズ230の駆動が完了することを交換レンズ200がカメラボディ100に通知できれば、どのような種類の情報であってもよい。例えば、フォーカスレンズ230や絞り260の駆動が完了することを通知する情報として、駆動完了までに要する経過時間を示す情報(秒)や、駆動完了までに要するフレームの数を示す情報や、予測した駆動完了のタイミングを示す情報を用いてもよい。
100 カメラボディ
110 CCDイメージセンサ
112 タイミング発生器
130 レリーズ釦
140 カメラコントローラ
200 交換レンズ
230 フォーカスレンズ
233 フォーカスモータ
240 レンズコントローラ
260 絞り
Claims (12)
- 交換レンズとカメラボディとを有するカメラシステムであって、
前記カメラボディは、
コマンドを生成するボディ制御手段と、
前記生成したコマンドを前記交換レンズに送信する送信手段とを備え、
前記交換レンズは、
可動部材と、
前記可動部材を駆動する駆動手段と、
前記カメラボディから、コマンドを受信する受信手段と、
前記受信したコマンドに従い前記駆動手段を制御するレンズ制御手段と、を備え、
さらに、前記受信したコマンドに応じた前記交換レンズの駆動手段の動作が所定期間内に完了するか否かを予測する予測手段を、前記カメラボディまたは前記交換レンズのいずれかに設けた、
カメラシステム。 - 前記予測手段は前記交換レンズ内に設けられ、
前記レンズ制御手段は、前記予測手段による予測結果を前記カメラボディに送信する、
請求項1に記載のカメラシステム。 - 前記予測結果は、前記受信したコマンドに応じた前記交換レンズの駆動手段の動作が所定期間内に完了するか否かを示すフラグ情報である、
請求項2に記載のカメラシステム。 - 前記予測結果は、前記受信したコマンドに応じた駆動手段の動作が完了するまでに要する時間を示す情報である、請求項2に記載のカメラシステム。
- 前記予測結果は、前記受信したコマンドに応じた駆動手段の動作が完了するタイミングを示す情報である、請求項2に記載のカメラシステム。
- 前記予測手段は前記カメラボディ内に設けられ、
前記レンズ制御手段は、前記予測手段による予測に使用される前記可動部材に関する情報を前記カメラボディに送信する、
請求項1に記載のカメラシステム。 - 前記ボディ制御手段は、前記予測手段による予測結果に基づき、前記交換レンズにおける前記受信したコマンドに応じた駆動手段の動作が所定期間内に完了すると予測されるときは、現在制御中の駆動手段の動作が完了した後に実行されるべき前記カメラボディまたは/および前記交換レンズの動作の制御を事前に開始する、請求項1に記載のカメラシステム。
- 可動部材と前記可動部材を駆動する駆動手段とを有する交換レンズが装着可能なカメラボディであって、
コマンドを生成するボディ制御手段と、
前記生成したコマンドを前記交換レンズに送信する送信手段と、
前記交換レンズにおいて前記送信したコマンドに応じた駆動手段の動作が所定期間内に完了するか否かを示す情報を、前記交換レンズから受信する受信手段と、を備えた、
カメラボディ。 - カメラボディに装着可能な交換レンズであって、
可動部材と、
前記可動部材を駆動する駆動手段と、
前記カメラボディからコマンドを受信する受信手段と、
前記受信したコマンドに従い前記駆動手段を制御するレンズ制御手段と、
前記受信したコマンドに応じた駆動手段の動作が所定期間内に完了するか否かを予測する予測手段と、
前記予測した結果を前記カメラボディに送信する送信手段と、
を備えた交換レンズ。 - 可動部材と前記可動部材を駆動する駆動手段とを有する交換レンズが装着可能なカメラボディであって、
コマンドを生成するボディ制御手段と、
前記生成したコマンドを前記交換レンズに送信する送信手段と、
前記交換レンズから、前記可動部材の状態を受信する受信手段と、
前記可動部材の状態に基づき、前記送信したコマンドに応じた前記交換レンズの駆動手段の動作が所定期間内に完了するか否かを予測する予測手段と、
を備えた、カメラボディ。 - 交換レンズとカメラボディとを有するカメラシステムであって、
前記カメラボディは、
同期信号とコマンドを生成するボディ制御手段と、
前記生成した同期信号とコマンドを前記交換レンズに送信する送信手段とを備え、
前記交換レンズは、
可動部材と、
前記可動部材を駆動する駆動手段と、
前記カメラボディから、同期信号とコマンドを受信する受信手段と、
前記受信した同期信号に同期して、前記受信したコマンドに従い前記駆動手段を制御するレンズ制御手段と、
前記受信したコマンドに応じた前記駆動手段の動作が所定期間内に完了するか否かを予測する予測手段と、を備え、
前記レンズ制御手段は、前記予測手段による予測結果を前記カメラボディに送信し、
前記予測結果は、前記受信したコマンドに応じた駆動手段の動作が完了するまでに要する、同期信号の周期の数を示す情報である、
カメラシステム。 - 前記レンズ制御手段は、前記コマンドを受信した同期信号の周期から所定数の周期後において、前記コマンドに応じて前記駆動手段を制御する、請求項11に記載のカメラシステム。
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JP5406830B2 (ja) | 2014-02-05 |
JPWO2009139192A1 (ja) | 2011-09-15 |
CN102027409A (zh) | 2011-04-20 |
US8542989B2 (en) | 2013-09-24 |
CN102027409B (zh) | 2014-10-29 |
EP2280306A4 (en) | 2012-07-04 |
EP2280306B1 (en) | 2013-10-23 |
EP2280306A1 (en) | 2011-02-02 |
US20110064397A1 (en) | 2011-03-17 |
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