JP5721423B2 - Optical apparatus and control method thereof - Google Patents

Description

  The present invention relates to an optical apparatus having a shake correction function and a control method thereof.

  As one of the shake correction devices installed in optical equipment such as digital cameras and digital video cameras, some lenses (hereinafter referred to as shift lenses) in the imaging lens unit are driven in the direction perpendicular to the optical axis, and the optical axis is There is an optical shake correction device that performs correction by changing.

  Since this shift lens is normally disposed between the variable magnification lens and the image sensor, the correction sensitivity varies depending on the focal length. Therefore, when the shift lens movement amount is constant, the angle that can be corrected changes depending on the focal length. For example, in a lens having a focal length difference of 10 times between the wide end and the tele end, The correctable angle is approximately 10 times.

  On the other hand, since the effective image circle of the lens having the above-described configuration is usually wider on the tele side than on the wide side, the amount of light that falls on one side of the peripheral portion of the screen (so-called reduction in peripheral light amount). There are few. For this reason, if a configuration in which the shift lens movement amount (correction angle) on the wide side is not limited, imbalance due to a decrease in the amount of peripheral light becomes noticeable when the shift lens is positioned near the end.

  As a method for alleviating the imbalance of the peripheral light amount drop during the shift lens operation, Patent Document 1 proposes a method of changing the center coordinate for performing the peripheral light amount drop correction according to the movement of the shift lens. Patent Document 2 also proposes a method of changing the driving range of the shift lens in accordance with the focal length and the aperture diameter of the stop.

JP 2006-165784 A JP 2006-259568 A

  However, the methods disclosed in the above-described patent documents have the following problems. That is, in an optical apparatus such as a digital video camera, an incident light amount limiting filter (hereinafter referred to as an ND filter) is disposed in the main body in order to alleviate the diffraction phenomenon at the time of a small aperture. There are several types of ND filters. Basically, the ND filter is inserted into the optical path when the diaphragm reaches a predetermined value to limit the amount of incident light. For this reason, even if the ND filter is applied to the optical path, the amount of peripheral light is unbalanced.

  As a result, when the movement of the shift lens is large on the wide side, the imbalance of the peripheral light quantity due to the application of the ND filter is further emphasized.

  Therefore, an object of the present invention is to provide an optical apparatus in which the imbalance of the peripheral light amount due to the application of the ND filter is not noticeable even when shake correction is performed when the ND filter is inserted in the optical path.

An optical apparatus according to the present invention controls a shake detection unit, an image shake correction unit that is disposed in a photographing lens unit and optically corrects an image blur, and controls the image shake correction unit based on an output of the shake detection unit. and control means for, changing means for changing a drivable correction range of the image blur correction means, and filter means for attenuating a quantity of light incident on the disposed and the imaging element to the imaging lens unit, an optical apparatus having a There,
The changing unit narrows a correction range in which the image blur correcting unit can be driven as the light amount attenuation amount by the filter unit increases ,
The changing unit changes the correction range of the image blur correcting unit when the insertion direction of the filter unit in the optical path and the driving direction of the image blur correcting unit are the same .

  As described above, according to the present invention, it is possible to provide an optical device in which the imbalance of the peripheral light amount due to the application of the ND filter is not noticeable even when shake correction is performed.

It is the block diagram which showed the structure of 1st Embodiment. 5 is a diagram illustrating a configuration example of an ND filter 133. FIG. It is the figure which showed the insertion operation to the optical path of ND filter 133. FIG. It is a control flowchart of the microcomputer 120 which shows operation | movement of 1st Embodiment. It is the figure which showed the change of the limiter of the shift lens 134 according to the insertion degree to the optical path of the ND filter 133. FIG. (A) It is the figure which showed the peripheral light amount change with respect to image height when the limiter of the drive range of the shift lens 134 is not changed. (B) It is the figure which showed the peripheral light amount change by changing the limiter of the drive range of the shift lens 134 in a present Example. It is a flowchart in a microcomputer which shows operation | movement of 2nd Embodiment. It is the block diagram which showed the structure of 3rd Embodiment. FIG. 6 is a diagram showing a relationship between an aperture diameter of a type of diaphragm in which an ND filter 801 is attached to a diaphragm 802 and an ND filter. It is a control flowchart of the microcomputer 806 which shows operation | movement of 3rd Embodiment.

  The form for implementing this invention is as describing in the following embodiment. However, the present invention is not limited to this embodiment, and various modifications and changes can be made within the scope of the gist.

<First Embodiment>
FIG. 1 is a block diagram showing the configuration of a digital video camera 100 which is an example of an optical apparatus according to the first embodiment of the present invention. Note that the microcomputer 120 controls the entire optical apparatus including shake correction, AF, zoom, and AE, but only the configuration necessary for the present invention is shown here for the sake of simplicity.

  The angular velocity sensor 101 detects a shake of the optical device. The high-pass filter 102 removes drift components and the like from the output (angular velocity signal) of the angular velocity sensor 101. The amplifier 103 amplifies the angular velocity signal from which the drift component has been removed by the high pass filter 102. The signal amplified by the amplifier 103 is output to the A / D converter 104 in the microcomputer 120.

  The A / D converter 104 converts the angular velocity signal from an analog signal to a digital signal to obtain angular velocity data. The shake correction amount calculation unit 105 generates an angle signal for the angular velocity data. The focal length correction unit 106 performs a correction corresponding to the focal length on the output (angle signal) of the shake correction amount calculation unit 105 to obtain a drive target value for the shift lens 134. The correction limiter setting unit 107 serving as a changing unit is a part that changes the drive target value of the shift lens 134, and details will be described later.

  On the other hand, another A / D converter 117 built in the microcomputer 120 converts the output obtained by amplifying the output of the position sensor 115 of the shift lens 134 by the amplifier 116 into a digital signal and uses it as position data of the shift lens 134. . The adder 111 calculates the difference (correction amount) between the current position data of the shift lens 134 and the drive target value. Note that the output of the adder 111 is a correction amount for actually driving the shift lens 134.

  The low-pass filter (LPF) 112 is a filter for reducing driving noise caused by the shift lens driver 114. The PWM unit 113 performs PWM (Pulse Width Modulation) on the output of the LPF 112 and outputs the PWM output from the microcomputer 120 as a PWM output. The shift lens 134 is driven via the shift lens driver 114 by this PWM output. The shake correction is performed by the above operation.

  Next, the lens unit in the present embodiment will be described. The digital video camera 100 includes a fixed lens group 130, a zoom lens 131, a shift lens 134, and a focus competition lens 135 in order from the subject side as a photographing lens unit. A diaphragm 132 and an ND filter 133 are disposed between the zoom lens 131 and the shift lens 134 so as to be insertable into the optical path. In particular, the shift lens 134 functions as a correction unit that optically corrects image blur that can be driven within a predetermined range in a direction orthogonal to the optical axis.

  In the lens unit of the present embodiment, the shift lens 134 is disposed closer to the image sensor 136 than the zoom lens 131. In this configuration, when the shift lens movement amount is constant, the angle at which shake correction is possible varies depending on the focal length. For example, when the zoom magnification is 10 times, the correctable angle at the telephoto end is ± 0.5 degrees (correctable angle when the optical axis center is 0 degree), and the shift lens is moved by the same amount The correctable angle at the wide end is ± 5.0 degrees.

  However, in practice, the effective image circle changes with the focal length, so if the shift lens is operated to the correctable angle at the full focal length, the peripheral light amount is reduced (vignetting occurs). End up. Therefore, a limiter (limit amount) is provided for the shift lens movement amount according to the focal distance, and the correction limiter setting unit 107 changes the shift lens movement amount according to the focal distance so that vignetting does not occur. Here, the limiter is assumed to be the size from the center of the optical axis to the end of the driving range of the shift lens 134.

  The image sensor 136 photoelectrically converts the subject image formed by the lens unit. The analog signal processing unit 137 performs predetermined processing on the signal obtained by the image sensor 136 to generate an analog image signal, and includes, for example, a CDS (correlated double sampling) circuit, an AGC (automatic gain adjustment) circuit, and the like. It is configured. The camera signal processing unit 138 is a camera signal processing unit that incorporates an A / D converter and performs digital signal processing, and generates a final output video signal. The camera signal processing unit 138 also performs peripheral light amount correction.

  The zoom lens control unit 121 controls the zoom lens driver 122 according to the state of a zoom switch (not shown) to drive and control the zoom lens 131, change the focal length, and change the subject image (magnification). Operation). A stepping motor is often used as a motor for driving the zoom lens 131, and the position of the zoom lens 131 can be detected by counting the number of drive pulses. Therefore, the current focal length of the photographic lens unit can be obtained from the position of the zoom lens 131, and the zoom lens control unit 121 serves as a focal length detection unit.

  The aperture 132 and the ND filter 133 are members for controlling the exposure when the digital video camera 100 is shooting. If the surroundings become brighter during shooting, the exposure can be optimized by closing the aperture 132 (with a small aperture) and increasing the shutter speed. However, when the aperture 132 is closed to a small aperture, a diffraction phenomenon occurs and the resolution of the image is significantly reduced. Therefore, in order to avoid a diffraction phenomenon when the stop 132 is a small stop, an ND filter 133 is inserted on the optical path to attenuate the amount of incident light.

  The aperture controller 141 controls the aperture 132 by controlling the aperture driver 142. The ND filter control unit 151 controls the ND drive driver 152 to drive and control the ND filter 133 to limit the amount of light incident on the image sensor 136. At the same time, the ND filter control unit 151 changes the limiter of the driving range of the shift lens 134 by the correction limiter setting unit 107 according to the operation of the ND filter 133 (operation to insert into the optical path). As a result, the peripheral light amount change due to the operation of the ND filter being inserted into the optical path is made inconspicuous.

  In the present invention, it is assumed that the driveable range of the shift lens 134 is a substantially circular shape or a polygon inscribed in a circle in a direction orthogonal to the optical axis. Therefore, by performing limiter control, the limiter is applied in a direction to reduce the radius of a circle representing a driveable range (or a circle circumscribing the driveable range). The driving position of the ND filter 133 is detected by the ND filter position sensor 153 and fed back to the microcomputer 120 (ND filter control unit 151).

  FIG. 2 is a diagram illustrating an example of the ND filter 133 used in the digital video camera 100. 2A is a combination of single density ND filters, and FIG. 2B is a gradation ND filter in which the density of the filter changes smoothly according to the position of the ND filter. The ND filter 133 in the present embodiment will be described on the assumption that it is the gradation ND filter of FIG. 2B, but the effects obtained in both cases are the same.

  3A shows the operation of inserting an ND filter combined with the single density ND filter of FIG. 2A into the optical path, and FIG. 3B shows the gradation ND filter of FIG. 2B as the optical path. The operation | movement inserted with respect to it is shown. 3A and 3B, the ND filter 133 operates and is inserted into the optical path when the aperture value (F number) is the first value (eg, F4). It has become. 3A corresponds to an insertion portion of the ND filter 133 on the optical axis, and FIGS. 3C to 3E correspond to FIGS. 3A to 3E.

  As described above, when the ND filter 133 is inserted into the optical path, a difference in transmittance in the vertical direction or the horizontal direction is generated according to the operation direction of the ND filter 133, and as a result, the unbalance of the peripheral light amount is conspicuous. It becomes like this. For this reason, the limiter of the shift lens by the correction limiter setting unit 107 is changed according to the operation of the ND filter control unit 151 in the microcomputer 120 being inserted into the optical path, and the peripheral light amount change due to the operation of the ND filter 133 is changed. Is inconspicuous.

  Next, FIG. 4 is a part of a flowchart of a program executed in the microcomputer 120, and the limiter control when the light amount is attenuated by inserting the ND filter 133 into the channel will be described.

  First, in step S401, the microcomputer 120 reads the shift lens limiter (shake correction limit amount) set for the focal length when the ND filter 133 is not inserted in the optical path (normal time). In this embodiment, the limiter for the normal shift lens driving amount is set as ROM data in the microcomputer 120, and the data is read out.

  In step S402, it is determined whether the ND filter 133 is currently inserted in the optical path. In step S403, if the ND filter 133 is inserted in the optical path as a result of the confirmation in step S402, that is, if the light amount is attenuated by the ND filter 133, the process proceeds to step S404. On the other hand, if the ND filter 133 is not inserted in the optical path, the process proceeds to step S405.

  In step S404, the limiter data read in step S401 is corrected in three ways according to the position of the ND filter 133, and new limiter data is calculated. The calculation of new limiter data in step S404 will be described later with reference to FIGS. Thereafter, in step S405, the limiter data is set as an actual limiter value in the correction limiter setting unit 107. In step S405, the limiter data read in step S401 is set as a limiter value in the correction limiter setting unit 107.

  FIG. 5 is a diagram showing a change of the limiter of the shift lens 134 according to the focal length, which is set by the correction limiter setting unit 107 as a changing unit.

  501, 502, and 503 in FIG. 5 indicate the amount of change of the limiter of the correction range (correction angle) depending on the position of the ND filter 133 in this embodiment. Reference numeral 501 indicates a change in the limiter at the normal time, that is, when the ND filter is not inserted in the optical path. Reference numeral 502 denotes a change in the limiter when the amount of light is attenuated by one stage by the ND filter. Reference numeral 503 denotes a change in the limiter when the light amount is attenuated by two stages by the ND filter. As shown in FIG. 5, on the telephoto side (telephoto side), the correction range (correction angle) is basically more limited than on the wide angle side (wide side).

  When the ND filter 133 is completely covered, that is, when the darkest part of the ND filter 133 enters the optical path (position (e) in FIG. 4B), the three-stage spectral amount is attenuated. The light intensity imbalance due to the gradation effect is eliminated. However, since the light amount drop according to the aperture value (F number) occurs, the limiter is not widened again.

  With the above operation, the limiter value of the shift lens 134 can be reset when the ND filter 133 is inserted. When the ND filter 133 is inserted, by limiting the limiter of the correction range of the shift lens 134, the shake correction range (correction angle) by the shift lens 134 may be reduced, and the image stabilization performance may be deteriorated. However, it is possible to alleviate the decrease in the amount of peripheral light caused by inserting the ND filter 133, and it is possible to improve the quality of the photographed image.

  FIG. 6 is a diagram showing a change in the light amount for each focal length with respect to the image height before and after the limiter change. The horizontal axis indicates the image height, the ratio of the distance when the optical axis center is 0 and the maximum diameter of the effective image circle is 1.0, and the vertical axis indicates the light amount at the optical axis center of 1.0. The light intensity ratio is shown. FIG. 6A shows a change in light amount before changing the limiter, and FIG. 6B shows a change in light amount when the present invention is applied. As is apparent from this figure, it is understood that the peripheral light amount drop is improved when the image height is near 100% (1.0), that is, when the shift lens 134 is near the maximum diameter of the effective image circle.

  As described above, by changing the correction range by the shift lens 134 according to the position of the ND filter (the amount of light attenuation of the incident light), even if the state of the ND filter changes, the peripheral light amount change due to the influence is not noticeable. An optical apparatus can be provided.

  In the control of S404 of FIG. 4 in the present embodiment, three kinds of limiters are set according to the position of the ND filter as shown in FIG. 5A. However, the attenuation amount of the incident light amount (light amount attenuation amount) by the ND filter can be changed in increments of 1/16, for example. In addition, instead of changing in stages, a limiter may be calculated by preparing and referring to a table in which an attenuation amount by inserting an ND filter and a correction range of the shift lens 134 are associated with each other, or by linear interpolation. Absent.

<Second Embodiment>
Next, a second embodiment of the present invention will be described.

  In this embodiment, the limiter of the driving range of the shift lens 134 is changed only in the direction in which the influence of the ND filter appears in accordance with the operation of inserting the ND filter 133 into the optical path. By doing so, the range of shake correction by the shift lens 134 can be made as wide as possible, so that deterioration in shake correction performance can be suppressed to a minimum and a decrease in the amount of peripheral light can be avoided. Note that the configuration of the digital video camera 100 of this embodiment is the same as that of the first embodiment, and a description thereof will be omitted.

  As shown in FIG. 3, the ND filter 133 is inserted into the optical path from one of the top, bottom, left and right of the screen. For this reason, the brightness varies depending on the insertion direction of the ND filter 133 on the left, right, and top of the screen. On the captured image, when the ND filter 133 is inserted from the direction opposite to the direction in which the ND filter 133 is inserted, that is, the direction corresponding to the downward direction when projected onto the screen, the upper side of the screen is more light. The decline of becomes noticeable.

  On the other hand, when looking at the shift lens operating direction, the amount of light in the direction in which the shift lens is moved similarly decreases. Therefore, when the insertion direction of the ND filter and the drive direction of the shift lens are the same. The fall in the amount of peripheral light will be most noticeable.

  FIG. 7 is a flowchart in the microcomputer 120 showing the operation of the second embodiment of the present invention. The operation of the second embodiment of the present invention will be described below with reference to FIG.

  In FIG. 7, in S701, limiter data of the shift lens 134 when the ND filter 133 is not inserted in the optical path (normal time) is read. In step S702, the control state of the ND filter 133 is confirmed. If the ND filter is inserted in the optical path, it is determined in S703 that the light amount restriction is being executed, and the process proceeds to S704. In S704, the insertion direction of the ND filter in the optical path is confirmed. In S705, the operation direction of the shift lens 134 is confirmed.

  Next, in S706, it is determined whether or not the insertion direction of the ND filter 133 is the same as the current driving direction of the shift lens, that is, whether or not the peripheral light amount drop is increasing. If the insertion direction of the ND filter 133 is the same as the current driving direction of the shift lens, the limiter data read in S701 is corrected in S707 according to the current light amount limit amount by the ND filter 133. In step S708, the limiter data corrected in step S707 is set in the setting data of the correction limiter setting unit 107.

  If the light amount restriction by the ND filter 133 is not performed in S703, or even if the light amount restriction is performed, if the insertion direction of the ND filter 133 is opposite to the driving direction of the shift lens in S706, the process proceeds to S708. . In other words, the limiter data is set in the correction limiter setting unit 107 in S708 while maintaining the data read in S701.

  As a result of the above operation, when there is a concern about the drop in the amount of peripheral light due to the insertion of the ND filter, the limiter is applied to the shift lens operation only when the drop in the amount of peripheral light is large according to the operation direction of the shift lens. As a result, it is possible to take as much as possible the shake correction angle by the shift lens, and to reduce the peripheral light amount drop.

  Further, in this embodiment, since the insertion direction of the ND filter in the optical path is confirmed, even if the insertion direction of the ND filter is either up, down, left, or right, it corresponds to a decrease in peripheral light amount regardless of the insertion direction. can do.

<Third Embodiment>
Next, a third embodiment of the present invention will be described.

  Unlike the first and second embodiments, the third embodiment relates to the control of this optical system, assuming that it is an imaging optical system having a configuration in which an ND filter is attached to the stop. This configuration is used to reduce the size of the lens. When the diaphragm is closed to a predetermined diaphragm value, the ND filter covers the optical path.

  FIG. 8 is a block diagram showing a third embodiment of the present invention. The same components as those in FIG.

  In FIG. 8, reference numeral 801 denotes an aperture. Reference numeral 802 denotes an ND filter having a structure attached to the diaphragm 801. For this reason, the ND filter 802 moves in conjunction with the aperture 801. Reference numeral 803 denotes an aperture position detection sensor, and reference numeral 804 denotes an aperture control unit that controls the operation of the aperture 801 (the same as the operation of the ND filter 802). Reference numeral 805 denotes a correction limiter setting unit serving as a changing unit that sets a correction limiter for the shift lens according to the state of the diaphragm (the same as the state of the ND filter). Numeral 806 is the camera control microcomputer in this embodiment, similar to 120.

  FIG. 9 simply shows the aperture (diaphragm aperture) of the aperture 801 and the position of the ND filter 802 when the ND filter 802 is attached to the aperture blades of the aperture 801. FIG. 9A shows a state when the diaphragm 801 is opened.

  As the state changes from FIG. 9A to FIG. 9E, the stop 801 becomes smaller, and at the same time, the ND filter 802 is inserted into the optical path. Here, when the F value exceeds the second value (F5.6 in this embodiment), the ND filter 802 is inserted into the optical path and covered. The amount of light amount limited by the ND filter 802 with respect to the movement of the diaphragm 801 can be obtained from the movement position of the diaphragm 801 because the ND filter 802 is attached to the diaphragm blades of the diaphragm 801.

  FIG. 10 is an internal flowchart of the microcomputer 806 for realizing the third embodiment of the present invention. The third embodiment of the present invention will be described below with reference to FIGS.

  In S901 of FIG. 10, the shift lens limiter (shake correction limit amount) stored in a ROM (not shown) inside the microcomputer 806 when the ND filter 802 is not inserted into the optical path (normal time) is read. In step S902, the current position information of the aperture 801 is acquired from the output of the aperture position sensor 803.

  Next, in S903, it is determined from the position information of the diaphragm 801 acquired in S902 whether or not the current F value is closer to the open side than the first value (F4 in this embodiment). When it is not the open side, that is, when it is the small aperture side, the process proceeds to S904, where it is determined whether the F value is smaller than the second value (F5.6) from the information acquired in S902. Do. If it is not the small aperture side, in S905, the limiter data read in S901 is corrected according to the acquired F value, and new limiter data is obtained. In step S907, the obtained limiter data is set as a limiter value in the correction limiter setting unit 805.

  When the F value is smaller than the second value (F5.6) in S904, the ND filter is inserted and covered in the optical path. For this reason, in S906, the limiter data corresponding to the time of small aperture is read from the ROM data of the microcomputer 806.

  If it is determined in S903 that the aperture value is closer to the open side than F4, the process proceeds to S907 because the ND filter has not yet started to cover the optical path. In step S907, the limiter data currently read is set as the limiter value in the correction limiter setting unit 805.

  With the above operation, even when the ND filter is attached to the stop, the amount of light limit by the ND filter can be determined by checking the state of the stop, and the shift lens prevents the peripheral light drop from becoming noticeable according to this limit amount. Limiter can be set.

  Similarly to the first embodiment, even in a configuration in which the ND filter is attached to the diaphragm blade, the change in the peripheral light amount due to the ND filter changes according to the focal length. The limiter value of the shift lens prepared in the ROM inside the microcomputer 806 changes in accordance with the focal length, and the correction amount of the limiter data by the ND filter also changes in accordance with the focal length.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

  Also, when a software program that realizes the functions of the above-described embodiments is supplied from a recording medium directly to a system or apparatus having a computer that can execute the program using wired / wireless communication, and the program is executed Are also included in the present invention.

101 Angular velocity sensor 133 ND filter 134 Shift lens

Claims (6)

A shake detection unit, an image shake correction unit that is disposed in the photographing lens unit and optically corrects the image blur, a control unit that controls the image shake correction unit based on an output of the shake detection unit, and the image An optical apparatus comprising: a changing unit that changes a correction range in which the shake correcting unit can be driven; and a filter unit that is disposed in the photographing lens unit and attenuates the amount of light incident on the imaging device .
The changing unit narrows a correction range in which the image blur correcting unit can be driven as the light amount attenuation amount by the filter unit increases ,
The optical device according to claim 1, wherein the changing unit changes the correction range of the image blur correcting unit when the insertion direction of the filter unit in the optical path and the driving direction of the image blur correcting unit are the same . The changing means, optical apparatus according to claim 1, based on the position of the filter means, and changes the correction range of the image blur correcting unit. It said changing means, by referring to the table correction range are associated by the image blur correcting means to the amount of light attenuation, according to claim 1, wherein changing the correction range of the image blur correcting means Optical equipment. A zooming unit that is arranged in the photographing lens unit and zooms the subject image;
A focal length detecting means for detecting a focal length of the photographing lens unit by the zooming means;
Further comprising
The changing means, in addition to said amount of light attenuation by the filter unit, the focal length any of claims 1 to 3, characterized in that changing the correction range of the image blur correcting means by an output of the detection means The optical apparatus described in 1. A diaphragm unit that is disposed in the photographing lens unit and that changes the amount of light incident on the imaging element; and a diaphragm position detection unit that detects a position of the diaphragm unit ;
5. The optical apparatus according to claim 1, wherein the filter unit is moved by the same amount in a direction in which the aperture unit operates . A shake detecting step for detecting shake, a control step for controlling image shake correcting means arranged in the photographing lens unit and performing optical shake correction based on the output obtained in the shake detecting step, and the image A change step for changing a driveable correction range of the shake correction unit, and a control method for an optical apparatus,
In the changing step, as the amount of light attenuation by the filter unit that attenuates the amount of light incident on the image sensor increases, the driveable correction range of the image shake correcting unit is narrowed,
In the changing step, the correction range of the image blur correction unit is changed when the insertion direction of the filter unit in the optical path and the drive direction of the image blur correction unit are the same. Control method.

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