JP5904773B2 - Camera system, interchangeable lens, and camera - Google Patents

Description

The present invention relates to a camera system , an interchangeable lens, and a camera including a photographic lens and a camera body to which the photographic lens can be attached.

  In recent years, the progress of video equipment has been remarkable. Especially in the field of cameras, the use of liquid crystal panels, organic EL, etc. instead of conventional optical viewfinders, as silver halide films for taking images have been replaced with image sensors. Display monitors and electronic viewfinders (EVFs) have been installed.

  However, in the case of the display monitor or EVF described above, it is possible to display all of the subject image formed on the image sensor, and the composition in the shooting screen is adjusted by adjusting the amount of display light during night shooting. Although it has the advantage of making it easier to see the image, it is difficult to understand subtle changes in focus compared to the optical viewfinders mounted on single-lens reflex cameras, etc., so the focus adjustment during manual focus (MF) is accurate. There is a drawback that it is difficult to do.

  As a method for solving such a problem, a method of enlarging and displaying a part of an image displayed on a display monitor or EVF by a button operation or a focus ring operation during MF operation has been proposed.

Japanese Patent Laid-Open No. 11-298791 JP 2010-51037 A

  However, in the proposals disclosed in Patent Document 1 and Patent Document 2, when the display image is enlarged during the MF operation, the focus lens drive control method is the same as when the image is not magnified. Although it becomes easy, when the sensitivity of the image plane change with respect to the movement of the focus lens is high, there is a problem that it is difficult to perform fine focus adjustment near the in-focus position.

  Also, if the sensitivity of the focus lens is lowered with priority given to operability when performing fine adjustment of the focus, it may take time to move the focus lens to near the in-focus position when the defocus amount is large. Occur.

  Furthermore, when autofocus (AF) is performed on a photographing lens that must use a highly sensitive focus lens as described above, the difficulty of driving control of the focus lens near the in-focus position is the same as during MF operation. There is a problem that high-precision AF control is difficult to execute and the AF control time becomes long.

The object of the present invention is to solve the above-mentioned problem, and to perform fine adjustment of the focus in the vicinity of the in-focus position during MF with good operability, and to perform high-precision focus lens drive control during AF. It is to provide a camera system , interchangeable lens, and camera that can

  In order to achieve the above object, a camera system according to a first aspect of the present invention is a camera system including an interchangeable lens and a camera main body to which the interchangeable lens can be attached, wherein the interchangeable lens is a first image with respect to a unit movement amount. Manual focusing is performed with a first focus adjustment lens group having a surface movement amount, a second focus adjustment lens group having a second image plane movement amount smaller than the first image plane movement amount with respect to the unit movement amount. And a lens drive control unit that performs drive control of the first focus adjustment lens group or the second focus adjustment lens group in accordance with an operation of the MF operation unit and an instruction from the camera body And the lens drive control unit responds to an instruction from the camera body when the MF operation unit is operated in a state where the interchangeable lens is mounted on the camera body. The first focus adjustment lens group or the second focus adjustment lens group is selected, and the first focus adjustment lens group or the second focus adjustment lens group selected according to the operation of the MF operation unit is selected. It is characterized by drive control.

An interchangeable lens according to a second aspect of the present invention is an interchangeable lens that can be attached to a camera body. When the second focus adjustment lens group having a second image plane movement amount smaller than the image plane movement amount, an MF operation unit for performing manual focus, and the MF operation unit are operated, One focus adjustment lens group or the second focus adjustment lens group is selected, and the first focus adjustment lens group or the second focus adjustment lens group selected according to the operation of the MF operation unit is driven and controlled. A lens drive control unit.
A camera according to a third aspect of the present invention is a camera having a plurality of focus adjustment lens groups, a first focus adjustment lens group having a first image plane movement amount with respect to a unit movement amount, and a first with respect to the unit movement amount. When the second focus adjustment lens group having a second image plane movement amount smaller than the image plane movement amount, an MF operation unit for performing manual focus, and the MF operation unit are operated, One focus adjustment lens group or the second focus adjustment lens group is selected, and the first focus adjustment lens group or the second focus adjustment lens group selected according to the operation of the MF operation unit is driven and controlled. A lens drive control unit.

According to the present invention, it is possible to finely adjust the focus near the in-focus position during MF with good operability, and to perform high-precision focus lens drive control during AF. , Interchangeable lenses, and cameras can be provided.

It is a block diagram which shows the structural example of the camera system which concerns on one embodiment of this invention. It is an electrical block diagram which shows the structural example of the camera system which concerns on one embodiment of this invention. It is a flowchart which shows an example of a process of the camera system which concerns on one embodiment of this invention. It is a flowchart which shows an example of a process of the camera system which concerns on one embodiment of this invention. It is a timing chart which shows an example of the synchronous communication of the interchangeable lens which concerns on one Embodiment of this invention, and a camera main body. It is a flowchart which shows an example of the process of the MF operation sensitivity setting of the camera system which concerns on one embodiment of this invention. It is a figure which shows an example of the drive operation | movement of the focus adjustment lens group at the time of MF mode of the camera system which concerns on one embodiment of this invention. It is a flowchart which shows an example of AF process of the camera system which concerns on one embodiment of this invention. It is a figure which shows an example of AF operation | movement of the camera system which concerns on one embodiment of this invention. It is a flowchart which shows an example of the process of the MF operation sensitivity setting of the camera system which concerns on one embodiment of this invention. It is a figure which shows an example of a structure of the image pick-up element of the camera system which concerns on one embodiment of this invention. It is a flowchart which shows an example of AF process of the camera system which concerns on one embodiment of this invention. It is a figure which shows an example of the camera system AF operation | movement which concerns on one embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram when an interchangeable lens is attached to a camera body in a camera system according to an embodiment of the present invention. The camera system 100 includes a camera body 101 and an interchangeable lens 201.

  The camera body 101 includes a camera control circuit 102, an image sensor 103, a focal plane shutter 104, a display monitor 105, a strobe 106, a release button 107, a battery 108, and the like.

  The camera control circuit 102 controls the image sensor 103 and the focal plane shutter 104 in accordance with the operation of the release button 107 by the photographer, and performs various drive controls of the interchangeable lens 201 through the lens control circuit 202 described later. For example, light emission control of the strobe 106 is also performed, and display control of the display monitor 105 is performed according to various camera operations.

  The imaging element 103 is configured by a CCD, a CMOS sensor, or the like, and performs imaging of a subject image formed on the imaging surface by the interchangeable lens 201.

  The focal plane shutter 104 performs an exposure operation on the image sensor 103 by opening and closing in accordance with an instruction from the camera control circuit 102 according to the operation of the release button 107.

  The display monitor 105 is composed of a liquid crystal display, an organic EL, or the like, and displays a through image display (so-called live view) in which an image output from the image sensor 103 is displayed in real time during shooting standby or movie shooting. In accordance with the operation of the illustrated reproduction button and various setting means, a reproduction image, setting information, and the like are displayed.

  The strobe 106 emits light in synchronism with the exposure operation at the focal plane shutter 104 using the charge stored in the light-emitting capacitor (not shown) according to an instruction from the camera control circuit 102 according to the operation of the release button 107 by the photographer. Perform the action.

  The release button 107 is an operation member for causing a camera system in which the interchangeable lens 201 is mounted on the camera body 101 to perform a shooting operation such as AE, AF, and exposure when operated by a photographer.

  The battery 108 is a power source for supplying power to the camera body 101 and the interchangeable lens 201.

  On the other hand, the interchangeable lens 201 includes a lens control circuit 202, a high image plane sensitivity focus adjustment lens group 203 (first focus adjustment lens group), a low image plane sensitivity focus adjustment lens group 204 (second focus adjustment lens group), A diaphragm 205, a manual focus ring (hereinafter referred to as MF ring) 206, and the like are configured.

  The lens control circuit 202 performs drive control of the high image surface sensitivity focus adjustment lens group 203, the low image surface sensitivity focus adjustment lens group 204, the diaphragm 205, and the like according to an instruction from the camera control circuit 102, and the photographer. In accordance with the operation of the MF ring 206, the drive control of the high image surface sensitivity focus adjustment lens group 203 and the low image surface sensitivity focus adjustment lens group 204 is performed.

  The image plane sensitivity indicates the reciprocal of the ratio of the amount of movement of the focus adjustment lens group and the amount of movement of the image plane corresponding thereto, and the higher the image plane movement amount relative to the unit movement amount of the focus adjustment lens group, the higher the image plane. Sensitivity. Therefore, the high image plane sensitivity focus adjustment lens group 203 has a first image plane movement amount with respect to the unit movement amount, and the low image plane sensitivity focus adjustment lens group 204 has a second image plane movement amount with respect to the unit movement amount. Therefore, the second image plane movement amount is smaller than the first image plane movement amount.

  The high image surface sensitivity focus adjustment lens group 203 is driven by an instruction from the lens control circuit 202 and moves within a movement range corresponding to the entire photographing distance range in the optical axis direction to adjust the focus state of the interchangeable lens 201.

  The low image surface sensitivity focus adjustment lens group 204 is driven by an instruction from the lens control circuit 202 and moves within a predetermined range in the optical axis direction around a predetermined position to adjust the focus state of the interchangeable lens 201.

  The diaphragm 205 is driven by an instruction from the lens control circuit 202 and adjusts the amount of subject light incident on the camera body 101 by changing the aperture area.

  The MF ring 206 is an operation member configured to be capable of rotating about the optical axis. When the photographer performs a rotation operation, the high image surface sensitivity focus adjustment lens group 203 and the low image are instructed by an instruction from the lens control circuit 202. The surface sensitivity focus adjustment lens group 204 is driven with a direction and a driving amount corresponding to the rotation operation, and a manual focus operation can be performed. The MF ring 206 constitutes a part of the MF operation unit.

  The electrical configuration of the camera system 100 of the present embodiment as described above will be described with reference to FIG. FIG. 2 is a block diagram illustrating an example of the electrical configuration of the camera according to the present embodiment, in which the camera control circuit 102 and the lens control circuit 202 illustrated in FIG. 1 are respectively expanded into electrical blocks. .

  The interior of the camera body 101 is configured to include a body CPU 121 (hereinafter referred to as BCPU) that controls the entire camera system 100. The BCPU 121 includes a main body communication circuit 131 for communicating with the lens CPU 221 via a communication circuit 231 described later, a nonvolatile memory 122 (FROM) such as a flash ROM in which a control program 135 of the BCPU 121 is stored, and various types of BCPU 121. A memory 123 such as a RAM for temporarily storing information is connected.

  In the case of the present embodiment, the BCPU 121 executes the control program 135, thereby realizing control operations exemplified in each flowchart described later.

  Further, the BCPU 121 includes an image sensor control circuit 124 that controls the image sensor 103 in order to obtain image data, and performs image processing such as A / D conversion and filter processing on the image signal output from the image sensor 103 to obtain a captured image. And an image processing circuit 125 that performs processing such as generation of image data to be stored and extraction of high-frequency components from image data in the focus detection region by high-pass filter processing to calculate an AF (autofocus) evaluation value. .

  Further, the BCPU 121 includes a shutter control circuit 126 that controls the focal plane shutter 104, a display circuit 127 that displays captured images and various types of shooting information on the display monitor 105, a flash control circuit 128 that controls the flash 106, and various types. An operation switch detection circuit 129 for detecting the operation switch state and a power supply circuit 130 for supplying power to the camera system 100 by smoothing or boosting the voltage of the loaded battery 108 are connected.

  Connected to the operation switch detection circuit 129 are various operation switches of the camera body 101 operated by the photographer, for example, a switch (not shown) that switches the shooting mode of the camera system 100, a release switch that is operated by operating the release button 107, and the like. Has been.

  The release switch in the present embodiment is a general two-stage switch, and the BCPU 121 executes operation control according to the state of each switch detected by the operation switch detection circuit 129. When the first release switch 132 (hereinafter referred to as a 1R switch) is turned on by half-pressing the release button, focus detection and photometry are performed, and the focus adjustment lenses 202 and 203 of the interchangeable lens 201 are driven to bring it into focus. Become. Further, when the second release switch 133 (hereinafter referred to as a 2R switch) is turned on by fully pressing the release button, the focal plane shutter 104 is driven to perform exposure.

  The interior of the interchangeable lens 201 includes a lens CPU 221 (hereinafter referred to as LCPU) that controls the interchangeable lens 201.

  The LCPU 221 includes a FROM 222, a RAM 223, a high image surface sensitivity focus adjustment lens drive circuit 224, a high image surface sensitivity focus adjustment lens position detection circuit 225, a low image surface sensitivity focus adjustment lens drive circuit 226, and a low image surface sensitivity focus adjustment lens position detection. A circuit 227, a diaphragm drive circuit 228, an MF operation detection circuit 229, a lens communication circuit 231 and the like are connected.

  The LCPU 221 performs various drive controls such as lens drive and aperture drive, and communicates with the BCPU 121 via the lens communication circuit 231 and the main body communication circuit 131 to receive an operation command, the lens operation state of the interchangeable lens 201, and the FROM 222. The stored lens data 235 such as optical data is transmitted. The LCPU 222 constitutes a part of the lens drive control unit.

  The high image surface sensitivity focus adjustment lens drive circuit 224 includes an actuator such as a stepping motor, a motor driver, and the like, and drives the high image surface sensitivity focus adjustment lens group 203 in the optical axis direction.

  The high image surface sensitivity focus adjustment lens position detection circuit 225 converts the rotation amount of the drive motor included in the high image surface sensitivity focus adjustment lens drive circuit 224 into the number of pulses, and the absolute position of the high image surface sensitivity focus adjustment lens 203. Includes a photointerrupter (PI) circuit represented by the number of pulses from a reference position such as an infinite end, and is driven by a high image surface sensitivity focus adjustment lens drive circuit 224. 203 position detection is performed.

  The low image surface sensitivity focus adjustment lens driving circuit 226 includes an actuator such as a stepping motor, a motor driver, and the like, and drives the low image surface sensitivity focus adjustment lens group 204 in the optical axis direction.

  The low image surface sensitivity focus adjustment lens position detection circuit 227 converts the rotation amount of the driving motor included in the low image surface sensitivity focus adjustment lens drive circuit 226 into the number of pulses, so that the absolute value of the low image surface sensitivity focus adjustment lens group 204 is reduced. The low image surface sensitivity focus adjustment lens group 204 is configured to include a PI circuit whose position is expressed by the number of pulses from the reference position such as the end of the movable range and is driven by the low image surface sensitivity focus adjustment lens drive circuit 226. Perform position detection.

The diaphragm drive circuit 228 includes an actuator such as a stepping motor, a motor driver, and the like, and controls the opening operation of the diaphragm 205. The MF operation detection circuit 229 includes a position detection circuit including a linear encoder, a PI circuit, and the like. The rotation direction and amount of rotation of the MF ring 206 corresponding to the operation by the photographer are detected.

  The lens communication circuit 231 has a communication connection terminal provided outside the interchangeable lens 201, and receives the focus adjustment lens groups 203 and 204 and the drive instruction of the diaphragm 205 from the BCPU 121, lens position information, operation state, and lens data. To the BCPU 121.

  FIG. 3 is a flowchart showing the processing of the BCPU 121.

  When the power of the camera body 101 is turned on, the BCPU 121 starts processing from step S101.

  In step S101, the BCPU 121 determines whether or not the interchangeable lens 201 is attached by detecting the state of a mount switch (not shown). If not, the BCPU 121 periodically detects attachment until it is attached. Perform standby operation. When the photographer performs an operation for changing the photographing parameter or an operation for reproducing an image photographed in the past during the standby, the instructed operation is executed. When it is confirmed in step S101 that the interchangeable lens 201 is attached, the BCPU 121 proceeds to step S102.

  In step S102, the BCPU 121 communicates with the LCPU 221 via the main body communication circuit 131 and the lens communication circuit 231, and obtains lens data 235 such as operating parameters of the focusing lens groups 203 and 204, optical data such as chromatic aberration data, and the like. And stored in the RAM 123.

  In step S103, the BCPU 121 starts synchronous communication via the LCPU 221, the main body communication circuit 131, and the lens communication circuit 231, and shifts to the synchronous communication mode. Thereafter, the BCPU 121 acquires lens state data for each synchronization period and responds to the lens state. Execute the control action. Details of the synchronous communication will be described later.

  In step S <b> 104, the BCPU 121 obtains image data by causing the image sensor 103 to operate for each synchronization period by the image sensor control circuit 124, performs image processing for through image display by the image processing circuit 125, and displays it by the display circuit 127. Display of the through image on the monitor 105 for use is started.

  In step S105, the BCPU 121 detects whether or not the interchangeable lens 201 is attached by checking the lens state data acquired by synchronous communication and detecting the mount switch state (not shown). If the interchangeable lens 201 is removed, the process returns to step S101. If so, the process proceeds to step S106.

  In step S106, the BCPU 121 checks whether or not the power of the camera body 101 is turned on. If it is turned off, the process proceeds to step S107. If it is turned on, the process proceeds to step S108.

  In step S107, the BCPU 121 executes predetermined end processing such as saving of various data, resetting operation, power supply system disconnection processing, and the like.

  In step S108, the BCPU 121 determines whether the focus mode is the MF mode or the AF mode. If the focus mode is the MF mode, the process proceeds to step S109. If the focus mode is the AF mode, the process proceeds to step S111.

  In step S109, the BCPU 121 performs MF operation sensitivity setting processing for setting the operation sensitivity of the MF ring 206, and sets the sensitivity according to the MF operation. Details of the MF operation sensitivity setting process will be described later.

  In step S110, the BCPU 121 instructs the LCPU 221 to set the MF mode by synchronous communication, and specifies sensitivity setting according to the result of the MF operation sensitivity setting in step S109. If the MF mode setting has already been instructed, the mode setting instruction may be omitted.

  In step S111, the BCPU 121 instructs the LCPU 221 to set the AF mode by synchronous communication. If the AF mode setting has already been instructed, the mode setting instruction may be omitted.

  In step S112, the BCPU 121 proceeds to step S113 when the operation switch detection circuit 129 detects that the 1R switch 132 is turned on, and returns to step S105 when it is in the off state. The MF operation in the MF mode is executed in a processing loop from step S105 to step S112 (N) through step S108 (Y).

  In step S113, the BCPU 121 determines whether the focus mode is the MF mode or the AF mode. If the focus mode is the AF mode, the process proceeds to step S114. If the focus mode is the MF mode, the process proceeds to step S115.

  In step S114, the BCPU 121 executes the AF operation while communicating with the LCPU 221. In the AF operation, a so-called hill-climbing AF method is performed in which the position at which the high-frequency component extracted from the photographed image is the largest is the focus position. Alternatively, the focus adjustment lens 203 is driven in accordance with the defocus amount obtained from the phase shift of a plurality of pairs of AF pixel outputs that receive subject light fluxes passing through different pupil positions of the interchangeable lens 201 provided on the image sensor 103. An operation by the controlled phase difference AF method is performed.

  In step S115, the BCPU 121 executes a photometric operation for still image shooting while communicating with the LCPU 221. As a photometric operation, an exposure calculation is performed by obtaining a luminance value or luminance distribution in the screen based on the output of the image sensor 103. Further, when the focus mode is the AF mode, the BCPU 121 may perform the photometry operation in parallel with the AF operation in step S114.

  In step S116, the BCPU 121 determines whether or not the 1R switch 132 is turned off based on the detection result by the operation switch detection circuit 129. If it is determined that the 1R switch 132 is turned off, the process proceeds to step S120. If it is determined that the state is the state, the process proceeds to step S117.

  In step S117, the BCPU 121 proceeds to step S118 when the operation switch detection circuit 129 detects that the 2R switch 133 is turned on, and returns to step S116 when it is turned off.

  In step S118, the BCPU 121 communicates with the LCPU 221 based on the exposure calculation result of the photometric operation in step S115, and instructs the aperture operation for the aperture 205. Then, after completion of the narrowing-down operation, the image pickup device control circuit 124 and the shutter control circuit 126 control the image pickup device 103 and the focal plane shutter 104 to pick up an image, and an image processing circuit 125 outputs an image pickup signal output from the image pickup device 103. Convert to data.

  In step S119, the BCPU 121 stores the image data acquired in step S118 in the RAM 123 or an external medium. At the same time, the display circuit 127 causes the display monitor 105 to display a captured image.

  In step S120, the BCPU 121 initializes the focus mark and clears the captured image display by the display circuit 127 and sets the display on the display monitor 105 to the through image display, and then returns to step S105 to enter the imaging standby state. Transition.

  FIG. 4 is a flowchart showing an example of processing of the LCPU 221 in the interchangeable lens 201 according to an embodiment of the present invention.

  In step S201, when the power of the camera body 101 is turned on and the power supply to the interchangeable lens 201 is started via the power contact of the mount (not shown), the LCPU 221 resets the focus adjustment lens groups 203 and 204 and the diaphragm 205. Perform the initial setting operation.

  In step S202, the LCPU 221 communicates with the BCPU 121 via the camera main body communication circuit 131 and the lens communication circuit 231, and according to a request from the BCPU 121, operation parameters such as the focusing lens groups 203 and 204 stored in the FROM 222, chromatic aberration, and the like. Lens data 235 such as optical data such as data is transmitted to the BCPU 121.

  In step S203, the LCPU 221 starts synchronous communication via the BCPU 121, the main body communication circuit 131, and the lens communication circuit 231, and shifts to the synchronous communication mode. Thereafter, the lens state data stored in the RAM 223 for each synchronization period is stored in the BCPU 121. Send to. Details of the synchronous communication will be described later.

  In step S204, it is determined whether or not the photographer has operated the release button 107 of the camera body 101 or MF operation in the MF mode, and the BCPU 121 has instructed the LCPU 221 to drive the focus adjustment lens groups 203 and 204. . If a drive execution instruction has been issued, the process proceeds to step S205. If a drive execution instruction has not been issued, the process proceeds to step S206.

  In step S205, the LCPU 221 includes a high image surface sensitivity focus adjustment lens drive circuit 224, a low image surface sensitivity focus adjustment lens drive circuit 226, a high image surface sensitivity focus adjustment lens position detection circuit 225, and a low image surface sensitivity focus adjustment lens position detection circuit. By 227, drive control of the high image plane sensitivity focus adjustment lens group 203 and the low image plane sensitivity focus adjustment lens group 204 is performed in accordance with the drive execution instruction from the BCPU 121. The details of the lens driving process executed in step S205 will be described later.

  In step S206, the LCPU 221 determines whether or not the focus mode is the AF mode based on information by synchronous communication. If the focus mode is the AF mode, the process proceeds to step S212, and if not the AF mode, the process proceeds to step S207.

  In step S207, the LCPU 221 determines whether or not the MF operation detection circuit 229 has operated the MF ring 206. The operation detection of the MF ring 206 is performed, for example, by determining whether or not the rotation position of the MF ring 206 detected at each operation detection timing by the MF operation detection circuit 229 has changed with respect to the previous detection position.

  Further, in order to drive focus adjusting lens groups 203 and 204, which will be described later, the rotation direction and position change amount (rotation amount) of the MF ring 206 are also obtained and stored at this time.

  In step S208, the LCPU 221 proceeds to step S209 if it is detected in step S207 that the operation of the MF ring 206 has been performed, and proceeds to step S212 if not detected.

  In step S209, the LCPU 221 determines whether or not the operation sensitivity of the MF ring 206 instructed from the BCPU 121 by synchronous communication is low sensitivity. If the sensitivity is low, the process proceeds to step S210. The process proceeds to step S211.

  In step S210, the LCPU 221 uses the low image surface sensitivity focus adjustment lens driving circuit 226 and the low image surface sensitivity focus adjustment lens position detection circuit 227 to adjust the low image surface sensitivity focus according to the rotation direction and the rotation amount detected in step S207. The lens group 204 is driven.

  In step S211, the LCPU 221 uses the high image surface sensitivity focus adjustment lens driving circuit 224 and the high image surface sensitivity focus adjustment lens position detection circuit 225 to adjust the high image surface sensitivity focus according to the rotation direction and the rotation amount detected in step S207. The lens group 203 is driven.

  In step S212, the LCPU 221 checks whether or not an instruction to stop power supply from the camera body 101 to the interchangeable lens 201 has been received from the BCPU 121. If an instruction to stop power supply has been received, the process proceeds to step S213. If not received, the process returns to step S204.

  Here, when the focus mode is set to the MF mode, the MF operation is performed from step S207 (N) to step S206 (N), from step S207 to step S210 or step S211, and step S212 (N ) Repeat the processing loop.

  When the focus mode is set to the AF mode, the processing loop of steps S204 (Y), S205, S206 (Y), and S212 (N) is repeatedly executed, and the AF operation is performed in step S205.

  In step S213, the LCPU 221 performs end processing such as storage of the current positions of the focus adjustment lens groups 203 and 204 and the diaphragm 205, a reset operation, and the like as necessary.

  FIG. 5 is a timing chart showing an example of synchronous communication between the interchangeable lens 201 and the camera body 101 according to an embodiment of the present invention. The synchronous communication between the BCPU 121 and the LCPU 221 will be described based on FIG.

  In the synchronous communication, the BCPU 121 sends a lens communication synchronization signal (e), which is a lens communication synchronization signal, to the LCPU 221 in a predetermined cycle other than the communication command, for example, the same cycle as the vertical synchronization signal (b) for imaging. Send.

  Further, the BCPU 121 transmits a lens position acquisition signal (f) instructing the timing for acquiring the position information of the focus adjustment lens groups 203 and 204 to the LCPU 221.

  The BCPU 121 changes the state of the lens position acquisition signal (f) at a predetermined timing. For example, as shown in FIG. 5, in the accumulation operation of the image sensor 103 shown in the image capture / read operation (c), the lens position acquisition signal (f) is obtained when ½ of the accumulation time at the center of the image sensor has elapsed. Change the state of. The LCPU 221 acquires the position information of the focus adjustment lens groups 203 and 204 at the timing of the state change of the lens position acquisition signal (f).

  In the interchangeable lens processing L1 (g), the position information of the focus adjustment lens groups 203 and 204 at the timing of the state change of the lens position acquisition signal (f), the operation state detection of the MF ring 206, and the detection The focus adjustment lens groups 203 and 204 are driven according to the operation state.

  In the camera body processing B1 (a), through image display, AF evaluation value calculation, and the like are performed based on the image data acquired in the previous frame.

  BL shown in the lens communication (d) is a lens state data request command for acquiring lens state data transmitted from the BCPU 121 to the LCPU 221.

  In the interchangeable lens processing L2 (g), the LCPU 221 determines the position information of the focusing lens groups 203 and 204, the operation state of the MF ring 206, etc. in response to the request of the lens state data request command BL (d) received from the BCPU 121. The lens state data LB (d) is transmitted to the BCPU 121.

  In the camera body processing B2 (a), AF calculation, in-focus determination in the MF mode, various setting changes, and the like are performed based on the lens state data LB (d) acquired by the lens state communication. The series of communication operations described above are repeatedly executed in synchronization with the lens communication synchronization signal (e).

  FIG. 6 is a flowchart showing the processing of the subroutine “MF operation sensitivity setting” executed by the BCPU 121. Based on FIG. 6, a specific example of the “MF operation sensitivity setting” process shown in step S109 of FIG. 3 will be described.

  In the “MF operation sensitivity setting” process, the BCPU 121 determines whether the position of the high image surface sensitivity focus adjustment lens group 203 is near the in-focus position based on the change in the AF evaluation value obtained from the image data acquired in each frame. Determine whether or not. Then, the MF operation is performed by selecting either the high image surface sensitivity focus adjustment lens group 203 or the low image surface sensitivity focus adjustment lens group 204 based on the determination result.

  In step S131, the BCPU 121 instructs the image processing circuit 125 to calculate an AF evaluation value based on the acquired image data, and acquires the AF evaluation value.

  In step S132, it is determined whether or not a maximum value has already been detected with reference to a maximum value detection flag indicating that a maximum value of the AF evaluation value has been detected. If no maximum value has been detected, step S132 is performed. The process proceeds to S133, and if the maximum value is detected, the process proceeds to Step S139. The maximum value detection flag is cleared when the camera body 101 is turned on or when the interchangeable lens 201 is attached to the camera body 101.

  In step S133, it is determined whether or not the acquired AF evaluation value is a maximum value. Based on the paired data of the AF evaluation value acquired in time series and the position information of the high image surface sensitivity focus adjustment lens group 203, it is determined whether or not the acquired AF evaluation value is a local maximum value. If so, the process proceeds to step S134.

  In step S134, the detected maximum value is set to the maximum value D1. In step S135, a determination value D2 calculated with a predetermined relationship based on the maximum value D1 is set. If it is determined in step S133 that the value is not the maximum value, the process proceeds to step S138.

  Here, the relationship between the AF evaluation value and the maximum value D1, the determination value D2, and the relationship between the AF evaluation value and the position of the focus adjustment lens group will be described with reference to FIG.

  In FIG. 7, D1 is an AF evaluation value (maximum value of AF evaluation value) when the position of the focus adjustment lens groups 203 and 204 is the focus position, and Dj is a position of the focus adjustment lens groups 203 and 204. A focus position vicinity determination range for defining a range determined to be close, and D2 indicates a focus position vicinity determination value that is a value obtained by subtracting the focus position vicinity determination range Dj from the maximum AF evaluation value D1. .

  LP1 is a focus position when the focus adjustment lens groups 203 and 204 are regarded as one lens group, and LP2 is one focus adjustment lens group 203 and 204 having an AF evaluation value of the focus position vicinity determination value D2. The lens position when it is regarded as one lens group is shown.

  Next, returning to the flowchart of the “MF operation sensitivity setting” process of FIG. 6, the description will be continued.

  In step S136, the BCPU 121 compares the acquired AF evaluation value with the determination value D2. If the AF evaluation value is smaller than the determination value D2, the BCPU 121 determines that it is not included in the in-focus position vicinity range, and proceeds to step S137. If the value is greater than or equal to the determination value D2, it is determined that it is included in the in-focus position vicinity range, and the process proceeds to step S142.

  In step S137, since it is determined that the BCPU 121 is not near the in-focus position, the value of the maximum value D1 is cleared and the maximum value detection flag is cleared.

  As described above, during the MF operation, when it is determined that the AF evaluation value is lower than the in-focus position vicinity determination value D2 and is not in the vicinity of the in-focus position, the value of the maximum value D1 is cleared. After that, when the maximum value of the AF evaluation value is detected again in step S133, the maximum value is set as a new maximum value D1.

  In step S138, the BCPU 121 sets the instruction setting of the focus adjustment lens group driven by the operation of the MF ring 206 in the high image surface sensitivity focus adjustment lens group 203.

  In step S <b> 142, the BCPU 121 sets the instruction setting of the focus adjustment lens group driven by the operation of the MF ring 206 in the low image surface sensitivity focus adjustment lens group 204.

  On the other hand, if the maximum value detection flag is set in step S132 and the BCPU 121 determines that the maximum value has already been detected, the BCPU 121 determines in step S139 whether or not the AF evaluation value exceeds the maximum value D1. Determine.

  In step S139, if the BCPU 121 determines that the AF evaluation value does not exceed the maximum value D1, the process proceeds to step S136 and determines whether or not the AF evaluation value is in the vicinity of the in-focus position.

  On the other hand, if the BCPU 121 determines that the AF evaluation value exceeds the maximum value D1, the process proceeds to step S140. In step S140, the latest AF evaluation value is updated as the maximum value D1.

  In step S141, the focus position vicinity determination value D2 is updated based on the updated maximum value D1. As described above, during the MF mode, detection of the maximum AF evaluation value D1 is continuously performed, and while the position of the high image surface sensitivity focus adjustment lens group 203 is determined to be in the vicinity of the in-focus position, a new value is obtained. Every time a maximum value is detected, the maximum value D1 and the in-focus position vicinity determination value D2 are updated.

  Then, since the AF evaluation value is the maximum value, it is determined that the focus adjustment lens group is driven by operating the MF ring 206 in step S142 as being within the range near the in-focus position. Set to 204.

  Next, an example of the MF operation including the operation based on the flowchart of the “MF operation sensitivity setting” process shown in FIG. 6 and the operation of the photographer will be described with reference to FIG.

  In the MF mode, the photographer performs a first rotation operation for rotating the MF ring 206 in the direction toward the in-focus position in order to focus by the MF operation.

  LD1 indicates the MF operation in the in-focus position direction by the first rotation operation, and indicates the driving operation of the high image surface sensitivity focus adjustment lens group 203, and is a short distance from the infinite side that is the direction of the in-focus position. The operation of moving the high image surface sensitivity focus adjustment lens group 203 in the direction toward the side will be described. Further, the high image surface sensitivity focus adjustment lens group 203 goes beyond the in-focus position LP1, and the AF evaluation value shows an operation exceeding the maximum value D1.

  The photographer observes the display monitor 105, recognizes that the focus position has been exceeded due to the contrast of the display image exceeding the peak in response to the first rotation operation of the MF ring 206, and A second rotation operation for rotating the MF ring 206 in the reverse direction is performed.

  As shown in FIG. 7, the position of the high image surface sensitivity focus adjustment lens group 203 immediately before this reversal operation is between LP1 and LP2, and the AF evaluation value corresponding to this is included in the focus position vicinity determination range Dj. Assume that it is determined that the focus position is in the vicinity in step S136 of the MF operation sensitivity determination process shown in FIG. Then, the low sensitivity is set in step S142, and the BCPU 121 changes the instruction setting of the focus adjustment lens group driven by the rotation operation of the MF ring 206 from the high image plane sensitivity focus adjustment lens group 203 to the low image plane sensitivity focus adjustment lens group. Change to 204 and set.

  LD2 indicates an operation of moving the low image surface sensitivity focus adjustment lens group 204 in the direction from the short distance side to the infinity side in accordance with the second rotation operation. Further, the low image surface sensitivity focus adjustment lens group 204 goes beyond the in-focus position LP1, and the AF evaluation value indicates an operation exceeding the maximum value D1.

  The photographer is observing the live view image displayed on the display monitor 105, and in response to the second rotation operation of the MF ring 206, the contrast of the display image on the display monitor 105 again exceeds the peak and is focused. Recognizing that the position has been exceeded, a third rotation operation for further rotating the MF ring 206 in the reverse direction is performed.

  LD3 indicates an operation of moving the low image surface sensitivity focus adjustment lens group 204 from the infinity side to the near distance side to reach the in-focus position LP1 in accordance with the third rotation operation.

  As described above, during the MF operation, it is determined whether or not the high image surface sensitivity focus adjustment lens group 203 is positioned in the vicinity of the in-focus position. Focus adjustment by the group 204 is performed. In this way, since the amount of image plane movement relative to the amount of operation of the MF ring 206 can be reduced, the focus adjustment accuracy can be further increased, and the operability when finely adjusting the focus is further improved. It is possible.

  FIG. 8 is a flowchart of the “AF” process executed in step S114 of FIG. When the hill-climbing AF method is adopted as the AF method, a high-frequency component of the image signal output from the image sensor 103 is extracted as an AF evaluation value by the image processing circuit 125, and the position of the focus adjustment lens group at which the AF evaluation value is maximized Control is performed with the in-focus position.

  In step S150, the BCPU 121 performs synchronous communication with the LCPU 221 and instructs the high sensitivity setting for performing the focus adjustment operation by moving the high image surface sensitivity focus adjustment lens group 203 in the AF operation.

  In step S151, the BCPU 121 performs synchronous communication with the LCPU 221 and instructs the start of a scanning operation for moving the focus adjustment lens group. The scan operation is executed by the LCPU 221 in step S205 in FIG.

  In step S152, the BCPU 121 acquires and stores the AF evaluation value calculated by the image processing unit 125 based on the image signal that is captured and output by the image sensor 103.

  In step S153, the BCPU 121 determines the AF evaluation value based on a plurality of pairs of data including the stored AF evaluation value and the position data of the focusing lens group acquired by the synchronous communication from the LCPU 221 corresponding to the AF evaluation value. Whether or not the maximum value has been exceeded. If the maximum value is exceeded, the process proceeds to step S154. If the maximum value is not exceeded, the process proceeds to step S159.

  In step S154, the BCPU 121 performs synchronous communication with the LCPU 221 and instructs to stop the scanning operation.

  On the other hand, in step S159, the BCPU 121 performs synchronous communication with the LCPU 221 and acquires information on whether or not the focus adjustment lens group has reached the movement limit. If the movement limit has been reached, the process proceeds to step S160, the detection impossible process is performed, and the AF process is terminated.

  If the movement limit has not been reached, the process returns to step S152, and the AF evaluation value during the scanning operation is repeatedly acquired until the maximum value is exceeded.

  In step S155, the BCPU 121 performs the in-focus position corresponding to the true maximum value of the AF evaluation value by interpolation processing or the like based on the AF evaluation values before and after the maximum value of the AF evaluation value and the position data of the focusing lens group corresponding thereto. Is calculated.

  In step S156, the BCPU 121 communicates with the LCPU 221 and instructs the high image surface sensitivity focus adjustment lens group 203 to move to the in-focus position. The focus position driving operation is executed by the LCPU 221 in step S205 in FIG.

  In step S157, the BCPU 121 communicates with the LCPU 221 to instruct low sensitivity setting for performing a focus adjustment operation for moving the low image surface sensitivity focus adjustment lens group 204 in the AF operation.

  In step S158, the BCPU 121 communicates with the LCPU 221 to instruct again the movement of the low image surface sensitivity focus adjustment lens group 204 to the in-focus position, and ends the AF process.

  The movement of the focusing lens group in the AF process executed as described above will be described in more detail based on FIG.

  FIG. 9 shows a change (a) in the image plane position due to the movement of the high image plane sensitivity focus adjustment lens group 203 with the horizontal axis direction as the image plane position, and the image plane position due to the movement of the low image plane focus adjustment lens group 204. It is a figure which shows a change (b).

  In FIG. 9, when the BCPU 121 instructs the LCPU 221 to execute scan drive for detecting the in-focus position LP1 at which the AF evaluation value is maximized (step S151), the LCPU 221 performs high image surface sensitivity focus adjustment. The lens group 203 is driven (LDs). Here, Ps indicates the drive resolution of the high image surface sensitivity focus adjustment lens group 203.

  Then, when the position of the high image surface sensitivity focus adjustment lens group 203 exceeds the focus position LP1, the maximum value of the AF evaluation value is detected (step S153: Y), and the scan drive is stopped at the position of LP3 (step S154). The BCPU 121 detects the in-focus position LP1 based on the AF evaluation value (step S155). The BCPU 121 instructs the LCPU 221 to execute driving for absolute position driving to the detected focus position LP1 (step S156), and the LCPU 221 focuses the high image surface sensitivity focus adjustment lens group 203 from the position of LP3. Drive to position.

  However, as shown in FIG. 9, when there is a deviation between the drive stop position and the focus position due to the drive resolution Ps of the high image surface sensitivity focus adjustment lens group 203, the focus position corresponding to the drive resolution Ps is the most. It is driven to the stop position LPc in the near front (LDo: Step S156).

  Then, the low image plane sensitivity focus adjustment lens group 204 is driven by the difference between the drive stop position LPc and the focus position LP1 of the high image plane sensitivity focus adjustment lens group 203 (LDw: step S158). Pw indicates the drive resolution of the low image surface sensitivity focus adjustment lens group 204. Since the image plane movement amount of the low image plane sensitivity focus adjustment lens group 204 is lower, the image plane movement amount of the high image plane sensitivity focus adjustment lens group 203 is related to the movement amount of the same lens group in the optical axis direction. Smaller than. Therefore, the resolution Pw is smaller than the resolution Ps.

  As described above, the correction driving (LDw) of the low image surface sensitivity focus adjustment lens group 204 for correcting the error due to the drive resolution Ps of the high image surface sensitivity focus adjustment lens group 203 is performed, and more accurate focus adjustment is performed. It is possible.

  The driving order of the focus adjustment lens groups 203 and 204 to the in-focus position is set sequentially, but may be simultaneous. By simultaneously executing, it becomes possible to shorten the driving time of the focus adjustment lens group, and it is possible to reduce the photographing time lag.

  In the above description, the low image surface sensitivity focus adjustment lens group 204 is driven and corrected for the error due to the drive resolution of the high image surface sensitivity focus adjustment lens group 203. However, other factors such as, for example, The correction may be applied to an error caused by the spatial frequency characteristics of the photographing optical system, an error caused by a mechanical shift including the camera body 101, or the like. Specifically, errors due to the spatial frequency characteristics of the photographing optical system, errors due to mechanical deviations including the camera body 101, and the like are stored in advance in the FROMs 122 and 222 of the camera body 101 and the interchangeable lens 201. The low-image-surface sensitivity focus adjustment lens group 204 may be driven and corrected based on the drive amount for the total error obtained by the error data of each factor acquired by the BCPU 121 or the LCPU 221.

  As described above, the camera system according to the first embodiment of the present invention can finely adjust the focus near the in-focus position during MF with good operability and has high accuracy during AF. It is possible to perform drive control of a focus lens.

  FIG. 10 is a flowchart showing processing by the BCPU 121 in the camera system according to the second embodiment of the present invention.

  Regarding the second embodiment, the description of the same part as that of the first embodiment is omitted, and only a different part will be described. The “MF operation sensitivity setting” process corresponding to FIG. 4 of the first embodiment will be described with reference to FIG.

  In step S161, the BCPU 121 proceeds to step S167 if the live view display on the display monitor 105 of the camera body 101 is enlarged, and proceeds to step S162 if it is normal display. Switching between the normal display and the enlarged display of the through image may be made manually by the photographer by operating a button on the camera body 101, or when the operation of the MF ring 206 is detected or in step S136 (FIG. 6). The BCPU 121 may automatically perform enlarged display when it is determined that the focus position is close.

  In step S162, the BCPU 121 determines whether or not the shooting mode is the macro mode. If the shooting mode is the macro mode, the process proceeds to step S167. If the shooting mode is any other mode, the process proceeds to step S163. The macro mode setting may be set in the mode selection menu of the camera body 101, or by synchronous communication from the interchangeable lens 201 side by operating the MF ring 206 of the interchangeable lens 201 or the macro mode setting button. The setting may be made by transmitting to the camera body 101 as lens state data.

  In step S163, the BCPU 121 determines whether or not the current photographing magnification is larger than the predetermined photographing magnification. If the current photographing magnification is larger than the predetermined photographing magnification, the process proceeds to step S167, and if smaller than the predetermined photographing magnification, the process proceeds to step S164. move on. Regarding the determination of the size of the photographing magnification, for example, the subject lens data corresponding to the current position of the high-field-sensitivity focus adjustment lens group 203 and the focal length data of the interchangeable lens 201 are used as the lens state data by synchronous communication. And the magnification is calculated from these ratios. Then, it is determined whether or not the obtained photographing magnification is larger than a predetermined photographing magnification, for example, 1/30 times.

  In step S164, the BCPU 121 determines whether or not the current F value of the interchangeable lens is smaller than a predetermined value. If smaller, the process proceeds to step S167, and if larger, the process proceeds to step S165.

  In step S165, the BCPU 121 determines whether or not the focus mode is the AF + MF mode. If the focus mode is the AF + MF mode, the process proceeds to step S167. If the focus mode is any other mode, the process proceeds to step S166. The AF + MF mode is a focus mode in which a manual focus operation is permitted in accordance with a rotation operation of the MF ring 206 by the photographer after performing an AF operation and focusing. This is a focus mode used when the photographer changes the focus position slightly from the state of being in focus by the AF operation.

  In step S166, the BCPU 121 sets the instruction setting of the focus adjustment lens group driven by the operation of the MF ring 206 in the high image surface sensitivity focus adjustment lens group 203.

  In step S167, the BCPU 121 sets the instruction setting of the focus adjustment lens group driven by the operation of the MF ring 206 to the low image surface sensitivity focus adjustment lens group 204.

  As described above, in the camera system according to the second embodiment of the present invention, in the MF mode, in the camera state in which more precise focus adjustment is desired, that is, the through image display of the display monitor 105 is performed. When the image is enlarged, when the shooting mode is the macro mode, when the shooting magnification is larger than the predetermined magnification, when the F value is smaller than the predetermined value, or when the focus mode is AF + MF mode, etc. Then, the low image surface sensitivity focus adjustment lens 204 is selected, and the focus adjustment according to the operation of the MF ring 206 is executed. As a result, the position of the focusing lens group can be controlled with higher resolution in terms of image plane, so that a more precise manual focus operation can be performed.

  Next, a third embodiment of the present invention will be described.

  The third embodiment differs from the first embodiment in that the hill-climbing AF method is adopted as the AF method, whereas the phase difference AF method is adopted.

  First, the configuration of the image sensor for performing the phase difference AF method will be described with reference to FIG. FIG. 11 is a partially enlarged schematic view of a pixel portion showing an example of the image sensor 103 used when performing phase difference AF in the camera system according to the present invention.

  The image sensor 103 includes a microlens 301 provided corresponding to each pixel for condensing a subject light beam on a plurality of pixels arranged on the imaging surface, and a shooting pixel 302 for capturing a subject image during normal shooting. A reference AF pixel 303 for capturing one subject image obtained by dividing the subject light beam for phase difference AF and a reference for capturing the other subject image obtained by dividing the subject light beam for phase difference AF. And an AF pixel 304.

  The outputs of the plurality of reference AF pixels 303 and the reference AF pixels 304 are read out, and the image processing circuit 125 calculates a phase difference based on the image signal composed of a plurality of two types of pixel outputs. Based on the calculated phase difference Find the in-focus position and adjust the focus.

  Next, the “AF” process executed in step S114 of FIG. 3 will be described based on the flowchart of FIG.

  In step S <b> 170, the BCPU 121 obtains a phase difference calculated by the image processing circuit 125 based on the outputs of the plurality of standard AF pixels 303 and reference AF pixels 304.

  In step S171, the BCPU 121 calculates a focus position based on the acquired phase difference. In step S172, the BCPU 121 performs synchronous communication with the LCPU 221 to instruct high sensitivity setting for moving the high image surface sensitivity focus adjustment lens group 203 and performing the focus adjustment operation in the AF operation.

  In step S173, the BCPU 121 executes the in-focus position front drive for moving the high image surface sensitivity focus adjustment lens group 203 to a position in front of the in-focus position described later.

  In step S174, the BCPU 121 performs synchronous communication with the LCPU 221 and instructs the low sensitivity setting for moving the low image surface sensitivity focus adjustment lens group 204 and performing the focus adjustment operation in the AF operation.

  In step S175, the BCPU 121 executes focus position driving for moving the low image surface sensitivity focus adjustment lens group 204 to the focus position, as will be described later.

  FIG. 13 shows a change in the image plane position (a) due to the movement of the high image plane sensitivity focus adjustment lens group 203 with the horizontal axis direction as the image plane position in the phase difference AF method, and the low image plane sensitivity focus adjustment lens 204 group. It is a figure which shows the change (b) of the image plane position by a movement.

  When the BCPU 121 instructs the LCPU 221 to execute driving to the previous position LPc that does not exceed the calculated in-focus position (step S173), the LCPU 221 is as if the high image surface sensitivity focus adjustment lens group 203 has been instructed. Drive to the position LPc before the in-focus position (LDd: step S205).

  Since the stop position by driving the high image surface sensitivity focus adjustment lens group 203 has a predetermined resolution Ps, a deviation occurs between the stop position and the focus position. For this reason, the actuator is driven to the stop position LPc that is closest to the in-focus position without exceeding the in-focus position. This is because once the in-focus position is exceeded, it is necessary to drive the focus adjustment lens group in the reverse direction, and an error factor such as backlash occurs, resulting in a problem that AF accuracy is lowered.

  Then, in response to the focus position drive instruction of the BCPU 121 (step S175), the LCPU 221 determines that the low image surface sensitivity focus adjustment lens group 204 is the difference between the stop position and the focus position of the high image surface sensitivity focus adjustment lens group 203 (LPc− Only LP1) is driven in the direction of the in-focus position (LDw: Step S205). Since the resolution of the stop position of the low image surface sensitivity focus adjustment lens group 204 is higher than the resolution of the stop position of the high image surface sensitivity focus adjustment lens group 203, the focus adjustment lens group is positioned closer to the in-focus position. Can do.

  As described above, in order to correct an error due to the driving resolution of the high image surface sensitivity focus adjustment lens group 203, correction drive (LDw) of the low image surface sensitivity focus adjustment lens group 204 is performed to perform more accurate focus adjustment. Is possible.

  The driving order of the focus adjustment lens groups 203 and 204 to the in-focus position is set sequentially, but may be simultaneous. By simultaneously executing, it becomes possible to shorten the driving time of the focus adjustment lens group, and it is possible to reduce the photographing time lag.

  In the above description, the low image surface sensitivity focus adjustment lens group 204 is driven with respect to an error due to the drive resolution of the high image surface sensitivity focus adjustment lens group 203. However, other factors, for example, photographing Errors due to the spatial frequency characteristics of the optical system, errors due to mechanical displacement including the camera body 101, and the like are stored in advance in the FROMs 122 and 222 of the camera body 101 and the interchangeable lens 201, and error data for each factor is stored. The low image surface sensitivity focus adjustment lens group 204 may be driven based on the driving amount for all errors acquired and calculated by the BCPU 121 or the LCPU 221.

  As described above, according to the third embodiment of the present invention, the low image surface sensitivity focus adjustment lens group 204 is used to correct an error caused by the drive resolution of the high image sensitivity focus adjustment lens group 203 during the AF operation. Thus, it is possible to perform more accurate focus adjustment.

  As described above, the present invention has a focus adjustment lens group having a high image surface sensitivity and a focus adjustment lens group having a low image surface sensitivity, and drives the two focus adjustment lens groups according to the focus adjustment operation to perform focusing. When a manual focus operation is performed by the photographer with the interchangeable lens to be mounted on the camera body, normally the focus adjustment lens group with high image surface sensitivity is driven to adjust the focus position and subtle focus adjustment. However, the focusing lens group with low image plane sensitivity is driven under the necessary conditions.

  In addition, when an autofocus execution instruction operation is performed by the photographer with the above configuration, both the focus adjustment lens group with high image surface sensitivity and the focus adjustment lens group with low image surface sensitivity are driven, and the image surface sensitivity is By driving the focusing lens group with low image plane sensitivity so as to correct the deviation from the in-focus position due to the driving resolution and stop position error of the high focusing lens group, high-precision autofocus can be performed To do.

  In addition, when the shooting mode is the moving image mode, the focus adjustment lens group with high image surface sensitivity follows scanning to detect scan position for detecting the in-focus position and to move the image surface due to the relative distance change between the subject and the camera. The focus adjustment lens group that is driven when driving and has low image plane sensitivity is driven when performing wobbling driving that performs minute reciprocating driving near the in-focus position in order to detect a change in the subject state.

  That is, the camera system according to the embodiment of the present invention can finely adjust the focus near the in-focus position during MF with good operability, and can perform high-precision focus lens drive control during AF. It can be carried out.

  Needless to say, the present invention is not limited to the configuration exemplified in the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. Further, regarding the operation flow in the claims, the specification, and the drawings, even if it is described using “first,” “next,” etc. for the sake of convenience, it is essential to carry out in this order. It doesn't mean.

DESCRIPTION OF SYMBOLS 100 Camera system 101 Camera main body 102 Camera control circuit 103 Image pick-up element 104 Focal plane shutter 105 Display monitor 106 Strobe 107 Release button 108 Battery 121 Main body CPU (BCPU)
122 Nonvolatile memory (FROM)
123 Memory (RAM)
124 Image sensor control circuit 125 Image processing circuit 126 Shutter control circuit 127 Display circuit 128 Strobe control circuit 129 Operation switch detection circuit 130 Power supply circuit 131 Main body communication circuit 132 First release switch (1R switch)
133 Second release switch (2R switch)
135 Control Program 201 Interchangeable Lens 202 Lens Control Circuit 203 High Image Surface Sensitivity Focus Adjustment Lens Group 204 Low Image Surface Sensitivity Focus Adjustment Lens Group 205 Diaphragm 206 Manual Focus Focus Ring (MF Ring)
221 Lens CPU (LCPU)
222 FROM
223 RAM
224 High image surface sensitivity focus adjustment lens drive circuit 225 High image surface sensitivity focus adjustment lens position detection circuit 226 Low image surface sensitivity focus adjustment lens drive circuit 227 Low image surface sensitivity focus adjustment lens position detection circuit 228 Aperture drive circuit 229 MF operation detection Circuit 231 Lens communication circuit 235 Lens data

Claims (9)

In a camera system composed of an interchangeable lens and a camera body to which the interchangeable lens can be attached,
The interchangeable lens has a first focus adjustment lens group having a first image plane movement amount with respect to a unit movement amount, and a second image plane movement amount smaller than the first image plane movement amount with respect to the unit movement amount. A second focus adjustment lens group, an MF operation unit for performing manual focus, an operation of the MF operation unit and an instruction from the camera body, or the first focus adjustment lens group or the second focus adjustment lens group. A lens drive control unit that performs drive control of the focus adjustment lens group,
When the MF operation unit is operated in a state where the interchangeable lens is mounted on the camera body, the lens drive control unit is configured to perform the first focus adjustment lens group or the lens drive control unit according to an instruction from the camera body. A camera system, wherein a second focus adjustment lens group is selected, and the first focus adjustment lens group or the second focus adjustment lens group selected according to the operation of the MF operation unit is driven and controlled. .   The camera body includes a focus detection unit that detects a focus level, and the lens drive control unit is configured to detect the second focus adjustment lens when a focus level output from the focus detection unit exceeds a predetermined determination value. The camera system according to claim 1, wherein the lens drive control unit is instructed to select a group.   The camera body can set a plurality of operation modes, and when the operation mode having a smaller allowable depth is set, the lens drive control unit selects the second focus adjustment lens group. The camera system according to claim 1, wherein an instruction is given to a lens drive control unit. In interchangeable lenses that can be attached to the camera body,
A first focus adjustment lens group having a first image plane movement amount with respect to a unit movement amount;
A second focus adjustment lens group having a second image plane movement amount smaller than the first image plane movement amount with respect to the unit movement amount;
An MF operation unit for performing manual focus;
When the MF operation unit is operated, the first focus adjustment lens group or the second focus adjustment lens group is selected, and the first focus adjustment lens selected according to the operation of the MF operation unit A lens drive control unit for driving and controlling the group or the second focus adjustment lens group;
An interchangeable lens comprising: It has a mode setting part that can set multiple operation modes,
The lens drive control unit selects the second focus adjustment lens group when the operation mode set by the mode setting unit is set to an operation mode whose allowable depth is smaller than normal. The interchangeable lens according to claim 4 . In a camera having a plurality of focusing lens groups,
A first focus adjustment lens group having a first image plane movement amount with respect to a unit movement amount;
A second focus adjustment lens group having a second image plane movement amount smaller than the first image plane movement amount with respect to the unit movement amount;
An MF operation unit for performing manual focus;
When the MF operation unit is operated, the first focus adjustment lens group or the second focus adjustment lens group is selected, and the first focus adjustment lens selected according to the operation of the MF operation unit A lens drive control unit for driving and controlling the group or the second focus adjustment lens group;
A camera characterized by comprising: A focus detection unit that detects the degree of focus of the plurality of focus adjustment lens groups;
7. The lens driving control unit according to claim 6 , wherein the lens drive control unit selects the second focus adjustment lens group when the degree of focus detected by the focus detection unit exceeds a predetermined determination value. 8. camera. The camera according to claim 7 , wherein the predetermined determination value is set in association with a maximum value of a degree of focus detected by the focus detection unit. It has a mode setting part that can set multiple operation modes,
The lens drive control unit selects the second focus adjustment lens group when the operation mode set by the mode setting unit is set to an operation mode whose allowable depth is smaller than normal. The camera according to claim 6 .

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