JP6168827B2 - Image stabilization apparatus and optical apparatus - Google Patents

Description

  The present invention relates to an image blur correction apparatus and an optical apparatus.

  In an image shake correction apparatus used in a photographing apparatus such as a digital camera, in general, a part of the photographing optical system (image shake correction lens) is displaced according to the detected camera shake. Depending on the amount, aberration and distortion in the captured image and a decrease in the amount of peripheral light occur.

  Therefore, Patent Document 1 proposes a method for correcting chromatic aberration by image processing in accordance with the amount of displacement of the image blur correction lens. In Patent Document 2, the aperture value is limited according to the displacement amount of the image blur correction lens, or the displacement amount of the image blur correction lens is set according to the aperture value so that the decrease in the peripheral light amount at the time of image blur correction is not increased. Proposes a way to limit. Patent Document 3 proposes a method of correcting a decrease in the amount of peripheral light in accordance with the amount of displacement of the image blur correction lens.

JP-A-4-78292 JP-A-6-67255 JP 2005-62242 A

  However, since Patent Documents 1 and 3 require an image processing system, the system becomes complicated, resulting in an increase in cost and a long processing time. Since Patent Document 2 limits the amount of displacement of the image blur correction lens so that the decrease in the amount of peripheral light at the time of image blur correction is not increased, the image blur correction effect with respect to large blurring is reduced. In the interchangeable lens imaging system, when the size of the image sensor is the APS-C size, or in the case of the crop photography function that extracts a part of the image sensor as an image signal, the imaging range is narrow, and the peripheral light amount reduction during image blur correction is conspicuous Absent. Nevertheless, according to Patent Document 2, the amount of displacement of the image blur correction lens is limited, so the above problem becomes significant.

  An object of the present invention is to provide an image blur correction apparatus and an optical apparatus capable of correcting image blur relatively easily and effectively while preventing deterioration of optical characteristics.

An image shake correction apparatus according to the present invention is an image shake correction apparatus that corrects a shake of an optical image formed by a photographing optical system, and an image of a subject obtained through the photographing optical system is divided into a plurality of different image sizes. Acquisition means for acquiring information relating to the set image size from an imaging device that records at a set image size, and whether the set image size is the first image size or the first image size A determination unit that determines whether the second image size is larger than the image size, and if it is determined that the set image size is the first image size , a range in which image blur correction is possible is determined . set to 1, and the set image size is if it is determined that the previous SL second image size, the image blur correction is possible range narrower second than the first range Image blur set to range And a positive limiting means, characterized by having a.

  According to the present invention, it is possible to provide an image blur correction apparatus and an optical apparatus that can correct image blur relatively easily and effectively while preventing deterioration of optical characteristics.

It is a block diagram of the imaging system in this embodiment. (Examples 1 and 2) It is a flowchart which shows the operation | movement of lens control of the imaging | photography system shown in FIG. (Examples 1 and 2) 3 is a flowchart for explaining details of a serial communication interrupt shown in FIG. 2. (Examples 1 and 2) 3 is a flowchart illustrating an image blur correction operation illustrated in FIG. 2. Example 1 3 is a flowchart illustrating an image blur correction operation illustrated in FIG. 2. (Example 2)

  FIG. 1 is a block diagram of the photographing system of the present embodiment. The photographing system (optical device) includes a camera body (imaging device, optical device) 101 and an interchangeable lens (lens device, optical device) 102.

  In this embodiment, as will be described later, an image blur correction device that corrects a shake of an optical image formed by the photographing optical system is provided in the interchangeable lens 102, and a part of the photographing optical system (image blur correction lens) is moved. Is used to correct image blur. However, the image blur correction apparatus may be provided in the camera body 101 and the image blur correction may be performed by moving the image sensor 112. Alternatively, the function of the image shake correction apparatus may be shared by the camera body 101 and the interchangeable lens 102 so that the entire photographing system functions as the image shake correction apparatus.

  The interchangeable lens 102 is configured to be detachable from the camera body 101 via a mount (not shown), and the camera body 101 and the interchangeable lens 102 can communicate information via interface circuits 122 and 123. The interchangeable lens 102 is also supplied with power from the camera body 101 via the interface circuits 122 and 123.

  The camera body 101 is a digital single-lens reflex camera in this embodiment, but can also be applied to a mirrorless camera. The present invention can be applied not only to a lens interchangeable digital still camera system but also to a lens-integrated digital still camera such as a compact camera, a digital video camera, and a lens interchangeable digital video camera.

  The camera body 101 includes a main mirror 103, a sub mirror 108, a finder optical system, a camera MPU 107, a focal plane shutter 110, an image sensor 112, a control system, an image processing system, and the like.

  The main mirror 103 and the sub mirror 108 are configured to be displaceable between a mirror down state shown in FIG. 1 and a mirror up state (not shown). The main mirror 103 and the sub mirror 108 are arranged on the optical axis of the photographing optical system in the mirror-down state, and retract from the optical axis so that the light from the object reaches the image sensor 112 in the mirror-up state.

  The main mirror 103 is composed of a half mirror. In the mirror-down state, a part of the light from the object is reflected by the finder optical system so that it can be observed by the user, and the remaining light is transmitted and transmitted to the sub mirror 108. The sub mirror 108 reflects light from the object to the focus detection means 109 in the mirror down state. The viewfinder optical system includes a pentaprism 104 and an optical viewfinder (OVF) 105 that convert an inverted image into an erect image, and allows a user to observe a subject.

  The focus detection unit 109 performs focus detection by detecting the phase difference between a pair of subject image signals, and the camera MPU 107 performs automatic focus adjustment (AF) based on the detection result of the focus detection unit 109 (phase difference AF). ).

  A photometric circuit 106 measures the illuminance on a focus plate surface (not shown) and inputs the measurement result to the camera MPU 107. The camera MPU 107 determines shooting conditions such as exposure time and aperture.

  At the time of photographing, the main mirror 103 and the sub mirror 108 are retracted to the pentaprism 104 side, the focal plane shutter 110 is driven by a shutter driving circuit (SH) 111, and the photographing light beam forms an image on the imaging surface of the image sensor 112. Thereby, the optical image formed by the photographing optical system is photoelectrically converted into an image signal. The image sensor 112 is configured by a photoelectric conversion element such as a CCD sensor or a CMOS sensor. The camera MPU 107 causes the image processing system to generate image data based on the output from the image sensor 112 and record or display the image data. A timing generator (TG) 113 controls the accumulation operation, read operation, reset operation, and the like of the image sensor 112. When the image sensor 112 is moved for image blur correction, it is moved in a direction perpendicular to the optical axis of the photographing optical system.

  The image processing system includes a CDS circuit (double correlation sampling circuit) 114, a gain control circuit (GC) 115, an A / D converter 116, a video signal processing circuit 117, a buffer memory 118, and the like. The CDS circuit 114 reduces accumulated charge noise of the image sensor 112, and the gain control circuit 115 amplifies the image signal. The A / D converter 116 converts the imaging signal amplified by the gain control circuit 115 from analog to digital image data. The video signal processing circuit 117 is image processing means for performing image processing such as filter processing, color conversion processing, and gamma processing on the image data digitized by the A / D converter 116. The image signal processed by the video signal processing circuit 117 is stored in a buffer memory (storage means) 118, displayed on an LCD (display means) 119, or recorded on a removable memory card (recording medium) 120. To do.

  The operation unit 121 includes operations such as power ON / OFF, shooting mode setting (such as still image, moving image, and continuous shooting), recording image file size setting, and a switch, dial, button, etc. for releasing at the time of shooting. Means. When the release switch is pressed halfway, the SW1 signal is output from the detection unit (not shown) that detects the release switch to the camera MPU 107 (SW1ON), and when the release switch is fully pressed, the SW2 signal is output from the detection unit to the camera MPU107. (SW2ON). When the release switch is half-pressed, the SW1 release signal is output from the detection unit to the camera MPU 107 (SW1OFF), and when the release switch is fully pressed, the SW2 release signal is output from the detection unit to the camera MPU 107. Is output (SW2 OFF). The shooting preparation operation (AF and photometry) is started by the SW1 signal, and the shooting operation is started by the SW2 signal.

  The camera MPU 107 is an imaging device control unit that is configured by a microcomputer and controls each part of the camera body 101, communicates with the lens MPU 124, and transmits various commands to the lens MPU 124.

  In this communication, various drive commands are transmitted to the interchangeable lens 102, and data such as the operation state and optical information in the camera body 101 and the interchangeable lens 102 are transmitted and received. For example, the interchangeable lens 102 transmits optical information, characteristic information, and other information to the camera body 101.

  “Optical information” means optical unique information that changes in accordance with the state of zoom, focus, diaphragm blades, and the like. “Characteristic information” is basically unique information that does not change depending on the state, for example, the name of the interchangeable lens 102 (ID information for specifying the model), the maximum communication speed, the open F value, and whether or not the variable power lens. Or information such as image height that can be AF. The other information includes information such as an operation state, a setting state, various information request commands (transmission requests), and drive commands.

  Similarly, the camera MPU 107 transmits unique information of the camera body 101, for example, the type of the camera body 101, the name of the camera body 101, the version of the control program of the camera body 101, and the size of the image sensor 112. For example, ID information indicating that the size of the image sensor 112 is full size or ID information indicating APS-C size is transmitted to the interchangeable lens 102.

  The camera MPU 107 calculates the driving amount of the focus lens 125 for obtaining the in-focus state in the automatic focus adjustment (AF), and transmits it to the lens MPU 124. The lens MPU 124 moves the focus lens 125 in accordance with the focus position. To drive. Further, the camera MPU 107 calculates the driving amount of the diaphragm 128 according to the photometric result by the photometric circuit 106 or the aperture value set by the user in response to a half-press of a release switch (not shown) provided in the camera body 101. Then, the camera MPU 107 transmits the calculation result to the lens MPU 124, and the lens MPU 124 drives the diaphragm 128 accordingly.

  In addition, the camera MPU 107 transmits an image blur correction start command to the lens MPU 124 in response to a half-press operation of the release switch. When receiving the image blur correction start command, the lens MPU 124 drives the image blur correction lens 127 as will be described later.

  Further, the camera MPU 107 drives the focal plane shutter 110 in response to a full press operation of the release switch, guides the light flux from the photographing optical system to the image sensor 112, and performs photographing.

  The interchangeable lens 102 has a photographing optical system, various drive means, and a control system.

  The photographing optical system forms an optical image of an object (subject), and includes a focus lens 125, a variable power lens 126, an image shake correction lens 127, and a diaphragm 128 along the optical axis in order from the object side. Each lens has one or a plurality of lenses and is unitized, but in FIG. 1, it is shown as a single lens for simplicity.

  The focus lens 125 is moved in the direction of the optical axis indicated by the alternate long and short dash line through a focus control circuit 129 and a focus lens driving motor (for example, a stepping motor) 130 as a driving means in accordance with a control signal from the lens MPU 124 to adjust the focus. I do. In addition to the focus lens driving circuit, the focus control circuit 129 includes a focus encoder that outputs a zone pattern signal and a pulse signal according to the movement of the focus lens. The subject distance can be detected by this focus encoder.

  The zoom lens 126 is moved in the optical axis direction when the photographer operates a zoom operation ring (not shown) to change the focal length. The zoom encoder 131 outputs a zone pattern signal corresponding to the movement of the lens.

  The image blur correction lens 127 is moved in a direction orthogonal to the optical axis via the image blur correction control circuit 132 and the linear motor 133 to correct image blur. The “perpendicular direction” only needs to have a component orthogonal to the optical axis, and may be moved obliquely with respect to the optical axis. The same applies to the case where the image sensor 112 is moved.

  In the image blur correction, a shake signal of the angular velocity sensor 135 that detects the angular velocity and outputs a signal corresponding to the angular velocity is processed by the signal processing circuit 136 and input to the lens MPU 124.

  However, an acceleration sensor that detects acceleration and outputs a signal corresponding to the acceleration is provided, and the output can be integrated once to function as an angular velocity sensor.

  The signal processing circuit 136 constitutes an image blur correction unit (image blur correction device) together with the lens MPU 124. The signal processing circuit 136 includes an A / D converter (not shown), a high pass filter (HPF), and an integration filter. An angular velocity signal obtained by the angular velocity sensor 135 is first converted from an analog signal to a digital signal by an A / D converter. Subsequently, the angular velocity signal converted into a digital signal becomes an angular velocity signal from which the DC component (low frequency component) has been cut by passing through the HPF. The angular velocity signal that has passed through the HPF passes through an integration filter and is converted into an angular displacement signal. By using the signal after passing through the HPF, an offset component (close to a DC component) due to camera shake can be removed, and a more accurate photographing state determination can be performed.

  The lens MPU 124 is a lens device control unit that includes a microcomputer and controls each part of the interchangeable lens 102 and can communicate with the camera MPU 107. The lens MPU 124 stores characteristic information and optical information unique to the interchangeable lens 102, a program relating to a control method to be described later, and necessary values in an internal memory (not shown).

  The lens MPU 124 of this embodiment also functions as an acquisition unit, an image blur correction amount calculation unit, an image blur correction limiting unit (limiter), an image blur correction lens control unit, and a shooting state determination unit.

  The acquisition unit acquires information about the size of the image sensor 112 or information about the recorded image size. The image blur correction amount calculation unit calculates the movement amount of the image blur correction lens 127 using the angular displacement signal and a predetermined mathematical expression. The amount of movement varies depending on the sensitivity of the focus lens 125 and the variable power lens 126, the determination result of the shooting state determination unit, and the limit value set by the image blur correction limiting unit.

  The image blur correction limiting unit sets a range in which image blur correction is possible if the size of the image sensor 112 acquired by the acquiring unit is the first size (for example, APS-C: 22.2 × 14.8 mm). The first range (for example, 0.7 mm) is set. Further, the image blur correction limiting unit can correct the image blur if the size of the image sensor 112 is a second size larger than the first size (for example, full size: 36.0 × 24.0 mm). This range is set to a second range (for example, 0.5 mm) smaller than the first range. Similarly, if the number of recorded pixels acquired by the acquisition unit is the first number of pixels (for example, VGA: 640 × 320), the image blur correction limiting unit sets the range in which image blur correction is possible as the first range. To do. Further, the image blur correction limiting means sets a range in which image blur correction is possible if the number of recorded pixels is a second pixel number larger than the first pixel number (for example, FHD: 1920 × 1080). A second range smaller than the range is set.

  The image blur correction lens control unit calculates a drive target signal for the image blur correction lens 127 and corresponds to the difference between the drive target signal and the position signal of the image blur correction lens 127 output from the image blur correction lens encoder 134. The drive signal is output to the image blur correction control circuit 132. In this way, the image blur correction is performed by feeding back the output from the image blur correction lens encoder 134 to the image blur correction control circuit 132.

  The imaging state determination means indicates the current imaging state of the imaging device based on the amplitude and frequency of the blur of the angular velocity signal that has passed through the HPF. For example, the image blur correction limiting means indicates the walking imaging state and the non-walking imaging state (stationary (Shooting state or panning). For example, the first range when it is determined as shooting while walking is set to be larger than the first range when it is determined as non-walking shooting, and the second range when it is determined as shooting while walking is determined as non-walking shooting. May be set to be larger than the second range in the case of being determined.

  The photographing optical system may include an optical unit that varies the optical characteristics of the photographing optical system by moving so as to be inserted into and retracted from the optical path of the photographing optical system. The optical unit is an extender that changes the focal length range of the entire system, an optical filter (polarizing filter, ND filter, sharp cut filter, ultraviolet filter), or the like. In this case, the image blur correction limiting means sets the first range when the optical unit is inserted to be smaller than the first range when the optical unit is retracted, and the second range when the optical unit is inserted. This range may be set smaller than the second range when the optical unit is retracted.

  The switch 139 is a switch for selecting image blur correction ON / OFF.

  The diaphragm 128 adjusts the amount of light incident on the image sensor 112 of the camera body 101 and changes the aperture diameter (aperture diameter) via the diaphragm control circuit 137 and the stepping motor 138 based on the control signal from the lens MPU 124. Is driven.

  FIG. 2 is a flowchart showing the control of the lens MPU 124, where “S” represents a step. Y represents “Yes”, and N represents “No”. The flowchart shown in FIG. 2 can be embodied as a program for causing a computer to realize the function of each step, and this also applies to other flowcharts.

  When the interchangeable lens 102 is attached to the camera body 101, serial communication is performed from the camera MPU 107 to the lens MPU 124, and the lens MPU 124 performs initial settings for lens control and image blur correction control (S200).

  Next, the lens MPU 124 performs switch state detection and zoom / focus position detection (S201). The switches include, for example, a switch between AF and manual focus adjustment (MF), the state of the switch 139, and the like.

  Next, the lens MPU 124 determines whether or not a driving command for the focus lens 125 has been received from the camera MPU 107 (S202). The drive command also includes a target drive amount (number of pulses) of the focus lens 125. If a drive command is received (Y in S202), the lens MPU 124 controls the drive of the focus lens 125 so as to detect the number of pulses of the focus encoder in the focus control circuit 129 and drive the target number of pulses (S203). Then, the lens MPU 124 determines whether or not the target pulse number P has been reached (S204). If the target is reached (Y in S204), the lens MPU 124 stops driving the focus lens 125 (S205). If the target has not been reached (N in S204), the lens MPU 124 controls the speed of the focus lens driving motor 130 so as to decelerate as the number of remaining drive pulses decreases (S206).

  When the drive command for the focus lens 125 is not received (N in S202), or after S205 or S206, the lens MPU 124 performs image blur correction control (S207). This image blur correction control is performed in response to an interrupt signal (such as SW1 ON) from the camera MPU 107. If the switch 139 is OFF in S201, the image blur correction lens 127 is stopped near the optical axis. If the switch 139 is ON, image blur correction control is started when a half-press of the release switch is transmitted from the camera MPU 107.

  Next, the lens MPU 124 determines whether or not a command for stopping all driving (stopping all driving of the actuators in the interchangeable lens) is received from the camera MPU 107 (S208). When a state in which no operation is performed on the camera body 101 continues for a predetermined time, an all drive stop command is transmitted from the camera MPU 107. If the full drive stop command is not received, the flow returns to S201. When the full drive stop command is received, the lens MPU 124 performs full drive stop control (S209). Here, the driving of all actuators is stopped and the sleep (stop) state is set. Power supply to the image shake correction apparatus is also stopped. Thereafter, when any operation is performed on the camera body 101, the camera MPU 107 transmits a signal for canceling the sleep state to the lens MPU 124.

  If there is a serial communication interrupt or an image blur correction control interrupt by communication from the camera MPU 107, the interrupt processing is performed. In the serial communication interrupt process, communication data is decoded, and lens processing such as aperture driving and focus lens driving is performed according to the decoding result. Then, SW1ON, SW2ON, shutter speed, camera model, and the like can be determined by decoding the communication data. The ID information indicating the size of the image sensor of the camera is also determined by this serial communication interrupt process. The image blur correction interrupt is a timer interrupt that is generated at regular intervals, and performs pitch direction (vertical direction) control and yaw direction (horizontal direction) image blur correction control. Note that the positions of the serial communication interrupt and the image blur correction interrupt are not limited to the positions shown in FIG.

  FIG. 3 is a flowchart for explaining a serial communication interrupt executed by the lens MPU 124. When receiving a communication interrupt from the camera MPU 107, the lens MPU 124 analyzes a command (command) from the camera (S300), and branches to processing corresponding to each command.

  When the command is ID communication (S301), the lens MPU 124 receives size information of the image sensor 112, information on the camera model and function, and transmits information on the lens model and function (S302). The lens MPU 124 may acquire the initial communication performed after the interchangeable lens 102 is attached to the camera body 101 without acquiring the size of the image sensor 112 in the serial communication interruption.

  When the command is an aperture drive command (S303), the lens MPU 124 drives the aperture 128 by a predetermined amount (S304).

  When the command is status communication (S305), the lens MPU 124 transmits the focal length information, the image shake correction operation state, and the like, and the status state (release switch state, shooting mode, shutter speed, etc.) of the camera body 101. (S306). The lens MPU 124 determines whether the camera body 101 is in preparation for shooting (SW1 ON), and starts image blur correction if SW1 is ON. The shooting mode information includes information on the number of recorded pixels.

  If the command is another command, for example, a focus drive command, lens focus sensitivity data communication, lens optical data communication, or the like (S307), the lens MPU 124 performs these processes (S308).

  FIG. 4 is a flowchart for explaining image blur correction interruption executed by the lens MPU 124 of the first embodiment.

  When the lens MPU 124 receives the image blur correction interrupt from the camera MPU 107, the lens MPU 124 receives the result of A / D conversion of the shake signal (angular velocity signal) of the angular velocity sensor 135 and is set in VAD_DAT (not shown) RAM area. (S400).

  Next, the lens MPU 124 determines whether the switch 139 is ON or OFF (S401). If the switch 139 is ON (Y in S401), it is determined whether SW1ON = 1, that is, whether the release switch is half-pressed (S402).

  If the switch 139 is OFF (N in S401), or if the release switch is not half-pressed (N in S402), the lens MPU 124 does not perform image blur correction, and thus initializes the high-pass filter and the integration calculation. (S403). The image blur correction lens drive target data SFTDRV is also zero.

  On the other hand, when the release switch is half-pressed (Y in S402), HPF calculation is performed (S404), and the time constant is switched for a predetermined time from the start of image blur correction, thereby mitigating rising image shake.

  Next, the lens MPU 124 performs an integration calculation using the HPF calculation result as an input (S405). The result is stored in a RAM area (not shown) set by DEG_DAT in the lens MPU 124. DEG_DAT is a deflection angle displacement signal.

  Further, since the decentering amount (sensitivity) of the image shake correction lens 127 for correcting the shake angle displacement DEG_DAT varies depending on the position of the focus lens 125 and the variable magnification lens 126, the lens MPU 124 performs the adjustment (S406). ). Specifically, the zoom and focus positions are each divided into several zones, and the average optical image stabilization sensitivity (deg / mm) in each zone is read from the table data and converted into image blur correction lens drive data. . The calculation result is stored in a RAM area (not shown) set by SFTDRV in the lens MPU 124.

  Next, the lens MPU 124 A / D converts the displacement signal of the image blur correction lens 127 and stores the A / D result in a RAM area set by SFT_AD in the lens MPU 124 (S407).

  Next, the lens MPU 124 determines whether the size of the image sensor 112 is the full size or the APS-C size based on the ID communication (S302) of FIG. 3 (S408). If it is the full size, the process proceeds to S411, and if it is the APS-C size, the process proceeds to S409.

  If the image sensor 112 is APS-C size, the lens MPU 124 sets the movable range (first range) of the image blur correction lens 127 as LIMIT_A (for example, 0.7 mm). Then, it is determined whether or not the image blur correction lens drive target data SFTDRV is not less than LIMIT_A (S409). If LIMIT_A or more (Y in S409), SFTDRV is rewritten to LIMIT_A (S410). Accordingly, the movable range of the image blur correction lens is limited to LIMIT_A. If it is less than LIMIT_A (N in S409), SFTDRV is maintained. Thereafter, S413 is performed.

  On the other hand, if the image sensor 112 is full size, the lens MPU 124 sets the movable range (second range) of the image blur correction lens 127 as LIMIT_B (for example, 0.5 mm). Then, it is determined whether or not the image blur correction lens drive target data SFTDRV is not less than LIMIT_B (S411). If it is greater than or equal to LIMIT_B (Y in S411), SFTDRV is rewritten to LIMIT_B (S412). As a result, the movable range of the image blur correction lens is limited to LIMIT_B. If it is less than LIMIT_B (N in S411), SFTDRV is maintained. Thereafter, S413 is performed.

  In S413, the lens MPU 124 performs a feedback calculation (SFTDRV-SFTPST) and stores the calculation result in a RAM area set by SFT_DT in the lens MPU 124.

  Next, the lens MPU 124 multiplies the loop gain LPG_DT by the calculation result SFT_DT in step 413 (S414), and stores the calculation result in a RAM area set by SFT_PWM in the lens MPU 124.

  Next, the lens MPU 124 performs a phase compensation calculation in order to obtain a stable control system (S415).

  Next, the calculation result of S415 is output as a PWM to the port of the lens MPU 124 (S416), and the image blur correction interruption ends. The output is input to a driver circuit in the image blur control circuit 132, and the image blur correction lens 127 is driven by the linear motor 133 to correct the image blur.

  As described above, in the first embodiment, the amount of displacement of the image blur correction lens 127 is limited to prevent aberrations, distortion, and decrease in the amount of peripheral light, and maintain optical characteristics. The limit value (threshold value) is changed according to the size of the image sensor 112. That is, if the size of the image sensor 112 is an APS-C size, the influence of the peripheral light amount reduction and aberration is less than the full size, so that the movable range of the image blur correction lens can be widened to cope with large blur correction. I am doing so. Needless to say, the size of the image sensor 112 is not limited to the APS-C size and the full size, and may be other sizes such as APS-H.

  FIG. 5 is a flowchart for explaining an image blur correction interruption executed by the lens MPU 124 of the second embodiment. In this embodiment, the movable range of the image blur correction lens is set according to the moving image recording image size (recording pixel number).

  The moving image recording image size of the camera can be set to 1920 × 1080 (FHD) / 640 × 480 (VGA), and the setting information is transmitted from the camera body 101 to the interchangeable lens 102 by status communication in S305 of FIG.

  FIG. 5 differs from FIG. 4 in that steps similar to those in FIG. 4 are denoted by the same reference numerals, and S500 is provided instead of S408. In S500, the lens MPU 124 determines whether the moving image recording image size is full high-definition or VGA. If it is full high-definition, the process proceeds to S411, and if it is VGA, the process proceeds to S409.

  As described above, in Example 2, the amount of displacement of the image blur correction lens 127 is limited to prevent aberration, distortion, and decrease in peripheral light amount, thereby maintaining optical characteristics. Further, the limit value (threshold value) is changed according to the moving image recording image size. That is, if the moving image recording image size is VGA, the influence of aberrations is less noticeable than in full high vision, so that the movable range of the image blur correction lens is widened to cope with large blur correction. Needless to say, the number of recording pixels is not limited to FHD and VGA, and XGA may be other number of recording pixels such as UHD.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

  As mentioned above, although the preferable Example of this invention was described, this invention is not limited to these Examples, A various deformation | transformation and change are possible within the range of the summary.

  The optical apparatus can be applied to an optical apparatus such as a digital still camera or a digital video camera, for example.

107: Camera MPU, 112: Image sensor, 127 image blur correction lens, 136: Signal processing circuit, 124: Lens MPU

Claims (5)

An image shake correction apparatus for correcting shake of an optical image formed by a photographing optical system,
An acquisition means for acquiring information on the set image size from an imaging device that records an image of a subject obtained through the photographing optical system with an image size set from a plurality of different image sizes ;
Determining means for determining whether the set image size is a first image size or a second image size larger than the first image size;
If the set image size is determined to be the first image size, image blur the range can be corrected to set the first range, the set image size before Symbol second image If it is determined that the size, the image shake correction limit means for setting the image blur correction is range narrow second range than the first range,
An image blur correction apparatus comprising: The image blur correction apparatus according to claim 1, wherein the blur of the optical image is corrected by moving an image blur correction lens included in the photographing optical system. The image shake correction apparatus according to claim 1, wherein the shake of the optical image is corrected by moving an image sensor included in the image pickup apparatus. The photographing optical system includes an optical unit that varies optical characteristics of the photographing optical system by moving so as to be inserted into and retracted from an optical path of the photographing optical system,
The image blur correction limiting means includes the first range when the optical unit is inserted into the optical path of the photographing optical system, and the first range when the optical unit is retracted from the optical path of the photographing optical system. The second range when the optical unit is retracted from the optical path of the photographing optical system is set to be narrower than the range, and the second range when the optical unit is inserted into the optical path of the photographing optical system is used. image blur correction device according to any one of claims 1 to 3, characterized in that set to be narrower than the. An optical apparatus characterized by having an image blur correction apparatus according to any one of claims 1 to 4.