JP2015118228A - Drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device capable of accurately performing one-sided blur correction without reducing the camera shake correction effect.SOLUTION: The object is attained by an imaging device including: imaging optical means; an imaging unit; first image moving means and second image moving means changing relative positions of a subject image and the imaging unit in an imaging plane; shake detection means detecting a shake; target-position determination means determining a target position of the first or second image moving means in response to the shake detected by the shake detection means; present-position detection means detecting a present position of the first or second image moving means; and feedback control means corresponding to each of the first image moving means and the second image moving means, and exerting a feedback control so that the present position detected by the present-position detection means can converge into the position determined by the target-position determination means, one of or each of the first image moving means and the second image moving means being driven based on the corresponding feedback control means.

Description

  The present invention relates to an imaging apparatus having an image blur correction function.

  An image shake correction apparatus conventionally mounted in a digital camera or the like drives a movable barrel holding an optical member or an image sensor in two directions (yaw direction and pitch direction) in a plane perpendicular to the optical axis, Reduce the effects of camera shake that occurs during shooting.

  Therefore, in the image blur correction device, a first movable lens barrel that holds the first correction member and a second movable lens barrel that holds the second correction member before and after the fixed member are arranged. Thus, a technique has been proposed that can increase the correctable angle of the image blur correction device by independently driving each movable lens barrel.

  In addition, there has been proposed a technique for correcting a single blur by driving a movable barrel when a single blur occurs in which the resolving power is reduced only in one direction around the screen. For example, in Patent Document 1, as a small and power-saving image shake correction apparatus, an image shake correction apparatus in which a first movable lens barrel and a second movable lens barrel are supported movably with respect to a common fixed member. Is disclosed.

JP 2009-258389 A

  In the image blur correction apparatus disclosed in Patent Document 1, it is assumed that the distance in the optical axis direction between the first movable lens barrel and the second movable lens barrel is constant. However, the interval between the lens groups constituting the optical system changes depending on the zooming operation or the focus adjustment operation. In such a case, the optical performance can be improved by changing the distance in the optical axis direction between the first movable lens barrel and the second movable lens barrel in accordance with the change in the distance between the lens groups. A system exists.

  In addition, the electromagnetic drive for driving the first movable lens barrel and the electromagnetic drive unit for driving the second movable lens barrel are arranged so as to overlap in the optical axis direction. Magnetic interaction force is generated between the parts. However, when the distance between the first movable lens barrel and the second movable lens barrel is changed, the influence of this magnetic interaction force changes. For this reason, it is difficult to perform highly accurate position control, and there is a problem that the camera shake correction effect is reduced and the accuracy of one-sided blur correction is reduced.

  Therefore, an object of the present invention is to provide an imaging apparatus that can perform one-sided blur correction with high accuracy without reducing the hand shake correction effect.

  In order to achieve the above object, the present invention relates to an imaging optical unit that forms a subject image, an imaging unit that converts the subject image into an electrical signal, and a relative distance between the imaging unit and the subject image. First image blur correction unit and second image blur correction unit that change in the image plane, a shake detection unit that detects a shake applied to the imaging apparatus, and a shake detected by the shake detection unit Target position determining means for determining respective target positions of the first image shake correcting means and the second image shake correcting means, the first image shake correcting means, and the second image shake correcting means. Current position detection means for detecting respective current positions, and current positions of the first image blur correction means and the second image blur correction means detected by the current position detection means are the target positions. Positioner Feedback control means for performing feedback control so as to converge at the position determined by the above, and any one of the first image shake correction means and the second image shake correction means based on the respective feedback control means An object of the present invention is to provide an imaging apparatus that drives one or both.

  According to the present invention, it is possible to provide an imaging apparatus capable of performing the one-sided blur correction with high accuracy without reducing the camera shake correction effect.

It is a block diagram of the whole imaging device concerning this invention. It is a block diagram of a lens having a shake correction function according to the present invention. 1 is an exploded perspective view of an image shake correction apparatus according to the present invention. It is a block diagram which shows the internal structure of the shift lens drive control part which concerns on this invention. It is a flowchart of the imaging device concerning the present invention. It is a shift lens drive diagram for the one-sided blur correction according to the present invention.

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

  FIG. 1 is a diagram illustrating a schematic configuration of an imaging apparatus according to an embodiment of the present invention.

  The imaging apparatus includes a zoom unit 101 including a zoom lens that performs zooming, and a zoom drive control unit 102 that drives and controls the zoom unit 101. The imaging apparatus is movable, and a shift lens (unit) 103 as a shake correction optical system that is movable in a plane substantially perpendicular to the optical axis, and a shift lens that drives and controls the shift lens 103. A drive control unit 104 is provided.

  Note that the zoom drive control unit 102 and the shift lens drive control unit 104 stop supplying drive power to the zoom unit 101 and the shift lens 103, for example, during power saving.

The imaging apparatus further includes an aperture / shutter unit 105 that performs the aperture operation and shutter operation of the optical system, and an aperture / shutter drive control unit 106 that drives and controls the aperture / shutter unit 105. Also, a focus unit 107 that performs focus adjustment, a focus drive control unit 108, and an image sensor that converts an optical image of a subject image that has passed through each lens group into an electrical signal by photoelectric conversion. The imaging unit 109 is provided. The focus drive control unit 108 drives the focus unit 107 to control the relative distance between the subject image and the imaging unit. In the imaging apparatus, the conversion process of the electrical signal output from the imaging unit 109 into the video signal is imaging. The video signal processing unit 111 performs processing according to the use of the video signal performed by the signal processing unit 110 and output from the imaging signal processing unit 110.

  In the imaging apparatus, the display unit 112 including a display performs image display as necessary based on the signal output from the video signal processing unit 111.

  The imaging apparatus operates the power supply unit 113 that supplies power to the entire imaging apparatus according to applications, an external input / output terminal unit 114 for inputting / outputting communication signals and video signals to / from the outside, and the imaging apparatus. The operation unit 115 is provided. Various data such as video information obtained by shooting is stored in the storage unit 116, and the control of the entire imaging apparatus is performed by the control unit 117.

  Next, an operation in the imaging apparatus configured as described above will be described. The operation unit 115 has a shutter release button (not shown) configured so that the first switch (SW1) and the second switch (SW2) are sequentially turned on according to the amount of pressing. The first switch (SW1) is turned on when the shutter release button is depressed approximately halfway, and the second switch (SW2) is turned on when the shutter release button is depressed to the end.

  When the first switch (SW1) is turned on, the focus drive control unit 108 drives the focus unit 107 to perform focus adjustment, and the aperture / shutter drive control unit 106 drives the aperture / shutter unit 105 to perform exposure. Set the volume appropriately. When the second switch (SW2) is turned on, a subject image is formed by exposing the optical image of the subject image to the imaging unit 109, and the subject image is based on an electrical signal converted by the imaging element. The obtained image data is stored in the storage unit 116.

  At this time, if there is an instruction to turn on the image stabilization from the operation unit 115, the control unit 117 instructs the shift lens drive control unit 104 to perform the image stabilization operation, and the shift lens drive control unit 104 that has received this instruction Anti-vibration operation is performed until the instruction is given.

  In addition, when the operation unit 115 has not been operated for a certain period of time, the control unit 117 issues an instruction to shut off the power source of the display included in the display unit 112 for power saving.

  In addition, the imaging apparatus can select one of the shooting modes from the still image shooting mode and the moving image shooting mode by operating the operation unit 115. In each photographing mode, the operating conditions of each actuator (movable element) constituting the imaging device can be changed.

  When an instruction for zooming with the zoom lens is input via the operation unit 115, the zoom drive control unit 102 that has received the position information instruction via the control unit 117 drives the zoom unit 101 to detect the position information. The zoom lens is moved to the zoom position designated by. Further, based on the image information processed by the imaging signal processing unit 110 and the video signal processing unit 111, the focus drive control unit 108 drives the focus unit 107 to perform focus adjustment.

  FIG. 2 shows a simple lens configuration of an imaging apparatus having a shake correction function. In the figure, the imaging apparatus includes a lens barrel 201, a first lens group 202, a second lens group (first image blur correction apparatus) 203, a diaphragm 204, and a third lens group (second lens group). Image blur correction device 205) and a fourth lens group 206. The first lens group 202 is fixed, and the second lens group and the third lens group (second image blur correction device) 205 perform image blur correction due to camera shake or the like. This is a fourth lens group 206 having both a focus surface correction and a focus adjustment function. The light passing through the fourth lens group from the first lens group is imaged here and photographed by the image sensor 207. The second lens group 203 and the third lens group 205 can change the magnification of the imaging optical system to a desired value by moving the positions in the optical axis direction.

  Next, the second lens group 203 serving as the first image blur correction device will be described in detail with reference to FIG. FIG. 3 is an exploded perspective view of the first image blur correction apparatus.

  The first image blur correction device 203 includes a second group lens 321, a second group movable barrel 322, a second group fixed ground plate 323, a rolling ball 324, a first second group electromagnetic drive unit 325, and a second second group electromagnetic drive. A portion 326, an urging spring 327, a second group position sensor 328, and a second group sensor holder 329 are configured.

  The first second group electromagnetic drive unit 325 includes a first second group magnet 3251, a first second group coil 3252, and a first second group yoke 3253. The second second group electromagnetic drive unit 326 includes a second second group magnet 3261, a second second group coil 3262, and a second second group yoke 3263.

  The second group lens 321 is a first correction optical member that can decenter the optical axis. The second group lens 321 is driven and controlled by a drive control means described later. In the image blur correction operation that moves the light image that has passed through the imaging optical system, the stability of the image on the imaging surface can be ensured. In this embodiment, a correction lens is used as the correction optical system. However, an imaging unit such as a CCD may be driven with respect to the photographing optical system. Thereby, the stability of the image on the imaging surface can be ensured. At this time, the imaging unit is a correction optical system.

  The second group movable lens barrel 322 is a first movable part that holds the correction lens 321 in the central opening. The second group movable barrel 322 can hold the first second group magnet 3251 and the second magnet 3261. The second group movable lens barrel 322 has three rolling ball receiving portions, and is supported by the rolling balls 324 so as to be movable in a plane perpendicular to the optical axis. Furthermore, three spring hooks are owned and one end of the biasing spring 327 can be held.

  The second group fixed ground plate 323 is a first fixing member formed in a cylindrical shape. Three 3 group followers 3231 are owned on the outer periphery. In addition, the movable barrel 322 can be disposed in the central opening, and the movable amount of the second group movable barrel 322 can be limited.

  The second group fixed ground plate 323 can hold the first coil 3252 and the first yoke 3253 at a location facing the magnetized surface of the first magnet 3251. Further, the second coil 3262 and the second yoke 3263 can be held at a position facing the magnetized surface of the second magnet 3261. In addition, three rolling ball receiving portions are arranged, and the second group movable lens barrel 322 can be movably supported in a plane perpendicular to the optical axis via the rolling ball 324. Further, the fixed ground plate 323 has three spring hooks and can hold one end of the biasing spring 327.

  The first second group electromagnetic drive unit 325 is a known voice coil motor. A current is passed through the first second group coil 3252 attached to the second group fixed ground plane 323. As a result, Lorentz force can be generated between the second group movable lens barrel 322 and the first second group magnet 3251, and the second group movable lens barrel 322 can be driven. In this embodiment, the first second group coil 3252 is sandwiched between the first second group magnet 3251 and the first second group yoke 3253. For this reason, the magnetic flux produced by the first second group magnet 3251 can be efficiently converted into a driving force. Further, the first second group yoke 3253 can reduce the amount of the magnetic flux of the first second group magnet 3251 leaking away.

  The second second group electromagnetic drive unit 326 is a voice coil motor that is rotated by 90 ° and is the same as the first second group electromagnetic drive unit 325, and thus detailed description thereof is omitted.

  The biasing spring 327 is a tension spring that generates a biasing force proportional to the amount of deformation. One end is fixed to the second group movable barrel 322, and the other end is fixed to the second group fixed base plate 323, and an urging force is generated between both ends. By this urging force, the rolling ball 324 is clamped, and the rolling ball 324 can maintain the contact state between the second group fixed ground plate 323 and the second group movable barrel 322.

  The second group position sensor 328 is two magnetic sensors using Hall elements that read the magnetic fluxes of the first magnet 3251 and the second magnet 3261, and the movement in the plane of the second group movable lens barrel 322 is determined based on the output change. Can be detected.

  The second group sensor holder 329 is configured on a schematic disk and is fixed to the second group fixed base plate 323. The two second group position sensors 328 can be held at positions facing the first second group magnet 3251 and the second second group magnet 3261. Further, the second group movable barrel 322 can be housed in the internal space formed together with the second group fixed ground plate 323. Thereby, even when an impact force is applied to the image blur correction apparatus or when the posture difference changes, it is possible to prevent the internal components from falling off. With this configuration, the first image blur correction device 203 can move the second group lens 321 to an arbitrary position on a plane orthogonal to the optical axis. That is, the first image shake correction apparatus 203 can change the relative distance of the imaging unit 109 with respect to the subject image within the imaging plane.

  The second group movable barrel 322 that holds the second group lens 321 is held by a rolling ball 324 so as to be movable with respect to the second group fixed base plate 323. At this time, the biasing spring 327 generates a biasing force that sandwiches the rolling ball 324 between the second group fixed ground plate 323 and the second group movable lens barrel 322. The position of the second group movable lens barrel 322 in the optical axis direction with respect to the second group fixed base plate 323 is determined stably. Then, a predetermined current is passed through the first second group coil 3252 and the second second group coil 3262 to apply a driving force to the movable lens barrel 322. With this driving force, the second group lens 321 can be moved to a predetermined position in the plane.

  The third group 205 is a second image shake correction device, and the shape of the third group lens and the shape of the third group movable barrel holding the third group lens are the same as those of the first image shake correction device, and the subject image. It is possible to change the relative distance of the imaging unit 109 with respect to the imaging plane. Detailed description is omitted.

  FIG. 4 is a block diagram showing an internal configuration of the shift lens drive control unit 104. The shift lens drive control unit 104 includes a pitch direction gyro unit 401a and a yaw direction gyro unit 401b as vibration detection means for detecting vibration applied to the imaging apparatus. The pitch direction gyro unit 401a detects a shake in the vertical direction (pitch direction) of the imaging apparatus in a normal posture (an attitude in which the length direction of the image frame substantially matches the horizontal direction). On the other hand, the yaw direction gyro unit 401b detects a shake in the horizontal direction (yaw direction) of the imaging apparatus in the normal posture.

  The image stabilization control unit 402a calculates a shift lens correction position control signal in the pitch direction based on the shake signal from the pitch direction gyro unit 401a. Similarly, in the image stabilization control unit 402a, the image stabilization control unit 402b calculates a shift lens correction position control signal in the yaw direction based on the shake signal from the yaw direction gyro unit 401b.

  Next, driving of the second lens group 203 serving as the first image blur correction device will be described. A magnet is attached to the second lens group 203 which is the first image blur correction device. This magnet is position detection means for detecting the position of the second lens group 203 in the pitch direction and the yaw direction by detecting the magnetic field of the magnet with the Hall elements of the current position detection units 405a and 405b.

  The PID unit 403a and PID unit 403b serving as feedback control units each output a drive command signal. The drive command signal is a control amount obtained from the deviation between the shift lens correction position control signals of the image stabilization control units 402a and 402b and the position signals of the current position detection units 405a and 405b, which are target position determination means. The drive unit 404a and the drive unit 404b are drive units that drive the second lens group 203 based on the drive command signals sent from the PID units 403a and 403b, respectively. The PID units 403a and 403b converge the signal level of the position signal to the signal level of the correction position control signal for driving the second lens group 203 respectively sent from the image stabilization control units 402a and 402b serving as target position determining means. Feedback control is performed.

  At this time, if one-sided blur occurs in which the resolving power is reduced only in one direction around the screen, the one-sided blur can be corrected by driving the second lens group 203. When the second lens group 203 is driven to perform one-sided blur correction, the second lens group 203 is driven according to optical characteristics such as focal length information by the zoom magnification changing unit 406a. Note that the drive amount necessary for the one-sided blur correction is added to the output of the image stabilization control unit 402a as the target position determining means, or the reference voltage of the current position detecting unit 405a is changed to a voltage corresponding to the drive amount necessary for the one-sided blur correction. To do. Thereby, the center position change which changes the center position used as the movable center of the 2nd lens group 203 in a pitch direction can be performed. Further, the drive amount necessary for the one-sided blur correction is added to the output of the image stabilization control unit 402b as the target position determining means, or the reference voltage of the current position detecting unit 405b is changed to a voltage corresponding to the drive amount necessary for the one-sided blur correction To do. Thereby, the center position change which changes the position used as the movable center of the 2nd lens group 203 to a yaw direction can be performed.

  Further, the image stabilization control unit 402a serving as target position determining means calculates a shift lens correction position control signal in the pitch direction for driving the second lens group 203 based on the shake signal from the pitch direction gyro unit 401a. This signal is a signal representing the movement target position (shake correction position) in the pitch direction. Similarly, the image stabilization control unit 402b, which is a target position determination unit, controls shift lens correction position in the yaw direction for driving the second lens group 203 of the image stabilization control unit 402b based on the shake signal from the yaw direction gyro unit 401b. Calculate the signal. This signal is a signal representing the movement target position (shake correction position) in the yaw direction.

  Therefore, the position of the second lens group 203 is adjusted in the direction in which the image blur due to the shake of the imaging device is corrected by the shift lens correction position control signal for driving the second lens group 203 output from each of the image stabilization controllers 402a and 402b. Move. In this way, even if the second lens group 203 that performs shake correction moves in the vertical and horizontal directions orthogonal to the optical axis, and the camera shake or the like occurs in the imaging apparatus, image blur can be prevented.

  Next, driving of the third lens group 205 which is the second image blur correction device will be described. A magnet is attached to the third lens group 205 which is the second image blur correction device. This magnet is current position detection means for detecting the current position of the third lens group 205 in the pitch direction and the yaw direction by detecting the magnetic field of the magnet with the Hall elements of the current position detectors 405c and 405d.

  The PID unit 403c and PID unit 403d as feedback control units each output a drive command signal. For the drive command signal, a control amount is obtained from a deviation between the shift lens correction position control signals of the image stabilization control units 402a and 402b serving as the target position determining means and the position signals of the detection units 405c and 405d serving as the current position means. The drive unit 404c and the drive unit 404d are drive units that drive the third lens group 205 based on drive command signals sent from the PID units 403c and 403d, respectively. In this way, the PID units 403c and 403d perform feedback control such that the position signal converges on the correction position control signal for driving the third lens group 205 sent from the image stabilization control units 402a and 402b, respectively.

  At this time, in the case where one-sided blur occurs in which the resolving power is reduced only in one direction around the screen, the one-sided blur can be corrected by driving the third lens group 205. When the third lens group 205 is driven to perform one-sided blur correction, the third lens group 205 is driven according to optical characteristics such as focal length information by the zoom magnification changing unit 406b. In addition, by adding the driving amount necessary for the one-sided blur correction to the output of the image stabilization control unit 402c, or changing the reference voltage of the current position detecting unit 405c to a voltage corresponding to the driving amount necessary for the one-sided blur correction, The movable center position of the third lens group 205 can be changed in the direction. Further, by adding the driving amount necessary for the one-sided blur correction to the output of the image stabilization control unit 402d, or changing the reference voltage of the current position detecting unit 405d to a voltage corresponding to the driving amount necessary for the one-sided blur correction, The movable center position of the third lens group 205 can be changed in the direction.

  In addition, the shift lens correction position control signal in the pitch direction for driving the third lens group 205 of the anti-vibration control unit 402a calculated based on the shake signal from the pitch direction gyro unit 401a is the movement target position (shake correction in the pitch direction). Position). Similarly, the shift lens correction position control signal in the yaw direction for driving the third lens group 205 of the image stabilization control unit 402b, which is calculated based on the shake signal from the yaw direction gyro unit 401b, is the movement target position (shake in the yaw direction). (Correction position).

  Therefore, the position of the third lens group 205 is adjusted in the direction of correcting the image blur due to the shake of the imaging device by the shift lens correction position control signal for driving the third lens group 205 output from the image stabilization control units 402a and 402b. Move. In this way, even if the third lens group 205 that performs shake correction moves in the vertical and horizontal directions orthogonal to the optical axis, and the camera shake or the like occurs in the imaging apparatus, image blur can be prevented.

  Next, a photographing operation including an image blur correction operation will be described with reference to a flowchart shown in FIG.

  First, after the camera is turned on in step S101, the process proceeds to step S102 to acquire information on optical characteristics such as current focal length information. In step S103, it is determined whether or not one-blurring correction is to be performed with the second lens group based on the optical characteristics such as the focal length information acquired in step S102. When the one-sided blur correction is performed with the second group lens, the process proceeds to step S104, and the one-sided blur correction is performed by moving the center position of the second group lens. When the one-side blur correction is not performed with the second lens group, the process proceeds to step S105. In step S105, it is determined whether or not one-blurring correction is to be performed with the third lens group based on the focal length information acquired in step S102. When the one-sided blur correction is performed with the third lens group, the process proceeds to step S106, and the one-sided blur correction is performed by moving the center position of the third group lens. When one-sided blur correction is not performed with the third lens group, the process proceeds to step S107. In step 107, when the second switch is pressed, the process proceeds to step S108 to execute an exposure operation. If the second switch has not been pressed, the process returns to step S102 and the above flow is repeated.

  At this time, depending on the respective lens characteristics of the second group lens and the third group lens, only the second group lens in step S104 is subjected to one-side blur correction, and in step 106, the one-side blur correction with the third group lens is performed. One-sided blur correction that is not performed can be performed. Alternatively, the one-sided blur correction can be performed only on the third group lens in Step 106 without performing the one-sided blur correction on the second group lens in Step S104. Further, both the one-sided blur correction of the second group lens in step S104 and the one-sided blur correction of the third group lens in step 106 may be performed. For example, as shown in FIG. 6, by driving the second group lens and the third group lens for each focal length, both the focal length section for driving one of the second group lens and the third group lens and both There may be a focal length section for driving the lens. As described above, the driving amount for the one-sided blur correction can be changed as appropriate according to the lens characteristics.

When performing both the one-sided blur correction of the second group lens in step S104 and the one-sided blur correction of the third group lens in step 106, the one-sided blur correction amount of each lens depends on the lens sensitivity. decide. For example, consider the case where the second group lens sensitivity is A and the third group lens sensitivity is B as follows.
Second group lens blur correction distance: Second group lens shake correction distance = B: A
Third group lens blur correction distance: Third group lens image stabilization distance = A: B

In such a case, depending on the sensitivity, the driving distance that can be used for one-side blur correction of each lens and the driving distance that can be used for camera shake correction are separated so that the camera shake correction distance can be greatly driven by a highly sensitive lens. Also good.
If the peripheral light amount is not uniform in S103 and S105, the center positions of the second group lens and the third group lens may be moved to positions where the peripheral light amount is uniform in S104 and S106.

  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.

103 IS unit 104 IS drive control unit 401a Pitch direction shake detection unit 401b Yaw direction shake detection unit 402a Pitch direction stabilization control unit 402b Yaw direction stabilization control unit 403a Pitch direction PID unit for second lens group control 403b Second lens group Yaw direction PID section for control 403c Pitch direction PID section for third lens group control 403d Yaw direction PID section for third lens group control

Claims (6)

Imaging optical means for forming a subject image;
An imaging unit for converting the subject image into an electrical signal;
A first image blur correction unit and a second image blur correction unit that change a relative distance of the imaging unit with respect to the subject image within an imaging plane;
Shake detection means for detecting shake applied to the imaging device;
Target position determining means for determining respective target positions of the first image shake correcting means and the second image shake correcting means in accordance with the shake detected by the shake detecting means;
Current position detection means for detecting respective current positions of the first image shake correction means and the second image shake correction means;
Feedback control is performed so that the current position of the first image blur correction unit and the second image blur correction unit detected by the current position detection unit converges to a position determined by the target position determination unit. Feedback control means;
In the imaging apparatus that drives one or both of the first image blur correction unit and the second image blur correction unit based on the respective feedback control units,
The first center position changing means for changing the center position as the movable center of the first image shake correcting means and the second center position changing for changing the center position as the movable center of the second image shake correcting means. Having means,
A center that is a movable center between the first image blur correcting unit and the second image blur correcting unit by one or both of the first center position changing unit and the second center position changing unit. An imaging apparatus, wherein the position is changed to a position based on the optical characteristics of the imaging optical means. The zoom unit further includes a zoom unit that performs zooming and a zoom drive control unit that drives and controls the zoom unit, and the first center position changing unit and the zoom unit based on optical characteristics of the imaging optical unit and position information of the zoom drive control unit 2. The image pickup apparatus according to claim 1, wherein the second center position changing means changes a center position serving as a movable center between the first image shake correcting means and the second image shake correcting means. Based on the optical characteristics of the imaging optical means and the position information of the zoom drive control unit, the first center position changing means changes the center position that is the only movable center of the first image shake correcting means. The imaging apparatus according to claim 1. Based on the optical characteristics of the imaging optical means and the position information of the zoom drive control unit, the second center position changing means changes the center position as the movable center only for the second image shake correcting means. The imaging apparatus according to claim 1. The first center position changing means and the second center position changing means based on the lens sensitivities of the first image shake correcting means and the second image shake correcting means, respectively. The imaging apparatus according to claim 2, wherein a center position serving as a movable center between the image blur correction unit and the second image blur correction unit is changed.   The first image shake correction unit and the second center position change unit allow the first image shake correction unit and the second image shake correction unit to make the peripheral light amount of the imaging optical unit uniform. The imaging apparatus according to claim 2, wherein a center position serving as a movable center is changed.

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