Optical shift devices and optical instruments

Abstract

To allow a compact optical shift device to stably perform shift driving of a lens.SOLUTION: When a holding member 220 in a non-moving state with respect to a base member 210 of an optical shift device 14 is seen from an optical axis direction of a lens 230, of two areas surrounded by a circle C passing through the most outside portion of the holding member centered on an optical axis, and two radii R1, R2 of the circle extending in first and second directions from the optical axis toward first and second actuators, an area where the center of gravity × of the holding member holding the lens and a first driving member is located is defined as a gravity-side area. A first urging member 410 urging the holding member toward the base member is arranged in the gravity-side area, and a second urging member 420 is arranged on the opposite side of the first urging member across the lens. A point of application black star of a resultant force of urging forces received from the first and second urging members in the holding member is located at a position different from the optical axis in the gravity-side area.SELECTED DRAWING: Figure 8

Description

Technical Field

[0004] , , , , ,

[0003]

[0001] The present invention relates to an optical shift device that moves (shifts) a lens in a direction orthogonal to the optical axis.

Background Art

[0002] The above-described optical shift device is used, for example, as an optical anti-vibration device that reduces (corrects) image blur caused by vibration of an optical device due to camera shake or the like. Patent Document 1 discloses an optical anti-vibration device shown in an exploded view in FIG. 13 and as viewed from the optical axis direction in FIG. 14. In this optical anti-vibration device, a movable unit 1200 including a correction lens 830 moves in a plane orthogonal to the optical axis with respect to a base member 810 to correct image blur. The movable unit 1200 is composed of a holding member 820 that holds the correction lens 830 and a shift magnet 1110 that is a part of two actuators attached to the holding member 820.

[0003] The base member 810 holds a shift coil 1120 at a position facing the shift magnet 1110. The movable unit 1200 abuts against the base member 810 via three balls 900 and is biased toward the base member 810 by two biasing springs 1000. By energizing the shift coil 1120, the movable unit 1200 moves in a plane orthogonal to the optical axis due to an electromagnetic action between the shift magnet 1110. Also, the two biasing springs 1000 are arranged near the upper end and the left end of the shift magnet 1110 in FIG. 14.

[0004] <l In FIG. 14, the position of the center of gravity × of the movable unit 1200 is deviated from the center of the correction lens 830 and approaches the shift magnet 1110. At this time, in order to prevent the movable unit 1200 from floating with respect to the balls due to an impact or the like, the two biasing springs 1000 are arranged closer to the shift magnet 1110. As a result, the position (action point) ★ where the resultant force of the biasing forces (biasing resultant force) from the two biasing springs 1000 acts on the movable unit 1200 is brought closer to the center of gravity ×. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2013-84013 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, in the optical vibration isolation device described in Patent Document 1, the biasing spring 1000, the shift magnet 1110, and the shift coil 1120 are in close proximity to each other, resulting in limited flexibility in their placement. For example, if the center of gravity is closer to the shift magnet 1110, the biasing spring 1000 must also be moved closer to the shift magnet 1110. The distance that the biasing spring 1000 can move closer to the shift magnet 1110 is limited to the range in which the biasing spring 1000 and the actuator do not interfere with each other. As a result, there is a risk that the lifting of the movable unit 1200 may not be sufficiently suppressed. Furthermore, it is possible to secure space for the biasing spring 1000 by shifting the position of the actuator toward the outer diameter side of the optical vibration isolation device. However, this may lead to an increase in the size of the optical vibration isolation device.

[0007] The present invention provides a compact optical shift device capable of stably shifting a lens, and an optical instrument equipped with the same. [Means for solving the problem]

[0008] An optical shift device as one aspect of the present invention comprises a base member, a holding member that holds a lens, a first biasing member and a second biasing member, respectively, attached between the holding member and the base member and biasing the holding member toward the base member, and a first drive member held by the holding member and a second drive member held by the base member, respectively, and a first actuator and a second actuator that move the holding member toward the base member in a first direction and a second direction that are perpendicular to the optical axis of the lens and perpendicular to each other. When the holding member, which is not moving relative to the base member, is viewed from the direction of the optical axis along which the optical axis extends, two regions are enclosed by a circle that passes through the outermost part of the holding member with the optical axis as the center, and the two radii of the circle that extend in the first and second directions from the optical axis toward the first and second actuators, respectively. Of these two regions, the region where the center of gravity of the holding member that holds the lens and the first drive member is located is defined as the center of gravity side region. In this configuration, the first biasing member is positioned within the region on the side of the center of gravity, and the second biasing member is positioned on the opposite side of the lens from the first biasing member. Furthermore, the point of application of the resultant force of the biasing forces received by the first and second biasing members on the holding member is located at a position different from the optical axis within the region on the side of the center of gravity. An optical instrument equipped with the above optical shift device also constitutes another aspect of the present invention. [Effects of the Invention]

[0009] According to the present invention, a compact optical shift device capable of stably driving a lens can be realized. [Brief explanation of the drawing]

[0010] [Figure 1] Side view of the lens unit and camera body equipped with the vibration damping unit of Example 1. [Figure 2] An exploded perspective view of the vibration isolation unit of Example 1, as seen from the subject side. [Figure 3] An exploded perspective view of the vibration isolation unit of Example 1, as seen from the imaging surface side. [Figure 4] A front view of the vibration isolation unit of Example 1, as seen from the subject side. [Figure 5] Front view showing the area including the center of gravity of the vibration isolation unit of Example 1 as viewed from the subject side. [Figure 6] Diagram showing the state where an external force is applied to the center of gravity position of the movable unit in the vibration isolation unit of Example 1. [Figure 7] Diagram showing the component force of the external force at the ball contact position in the vibration isolation unit of Example 1. [Figure 8] Diagram showing the acting point of the biasing resultant force of the vibration isolation unit of Example 1. [Figure 9] Diagram showing the movable unit on which the biasing resultant force acts in the vibration isolation unit of Example 1. [Figure 10] Diagram showing the component force of the biasing resultant force at the ball contact position in the vibration isolation unit of Example 1. [Figure 11] Diagram showing the driving force and the reaction forces from each biasing member when the movable unit is shift-driven in the yaw direction in the vibration isolation unit of Example 1. [Figure 12] Diagram showing the driving force and the reaction forces from each biasing member when the movable unit is shift-driven in the pitch direction in the vibration isolation unit of Example 1. [Figure 13] Exploded perspective view of a conventional optical vibration isolation device. [Figure 14] Front view of a conventional optical vibration isolation device. [Figure 15] Diagram showing a modified example of the embodiment, in which the biasing springs have different spring constants. [Figure 16] Cross-sectional view of a vibration isolation unit having biasing springs with different lengths in the optical axis direction, which is a modified example of the embodiment. [Figure 17] Cross-sectional view of a vibration isolation unit having biasing springs with different lengths in the shift direction, which is a modified example of the embodiment.

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment

[0012] FIG. 1 shows the configuration of a digital camera as an imaging device including an anti-vibration unit (optical anti-vibration device) 14 as an optical shift device according to Embodiment 1 of the present invention. The camera has a camera body 11 and a lens unit (lens device) 13. The lens unit 13 may be integrated with the camera body 11 or may be detachable. When the camera body 11 and the lens unit 13 are integrally configured, an optical device is formed by these, and when the lens unit 13 is detachable from the camera body 11, the lens unit 13 corresponds to the optical device.

[0013] The camera body 11 has an imaging element 12 that photoelectrically converts (images) a subject image formed by the lens unit 13. As the imaging element 12, a CCD sensor, a CMOS sensor, or the like is used.

[0014] The lens unit 13 has an anti-vibration unit 14 including a correction lens 230, a movable lens 17 movable in a direction along the optical axis (hereinafter referred to as the optical axis direction), and a drive control unit 15 including an arithmetic unit 16. The lens unit 13 has an imaging optical system composed of a correction lens 230, a movable lens 17, and one or more lenses and an aperture (not shown). The anti-vibration unit 14 corrects image blur caused by camera shake such as hand shake by moving (shifting) the correction lens 230 within a shift plane that is a plane orthogonal to the optical axis of the imaging optical system. FIG. 1 shows a non-shift state (non-moving state), in other words, a neutral state in which the correction lens 230 is not shifted with respect to a base member 210 described later. In the non-shift state, the optical axis of the correction lens 230 coincides with the optical axis of the imaging optical system.

[0015] The movable lens 17 includes at least one of a zoom lens and a focus lens. The drive control unit 15 controls the driving of the correction lens 230 based on the driving amount of the correction lens 230 calculated by the arithmetic unit 16.

[0016] Figures 2 and 3 show the disassembled vibration isolation unit 14 as viewed from the subject side and the imaging plane side in the optical axis direction of the corrective lens 230, respectively. The holding member 220 is a frame member that holds the corrective lens 230. The base member 210 is fixed to a fixing part (not shown) of the lens unit 13 in a direction perpendicular to the optical axis. The balls 310, 320, and 330 are arranged to be sandwiched between the holding member 220 and the base member 210 in the optical axis direction. The holding member 220 can smoothly shift relative to the base member 210 while rolling the balls 310, 320, and 330 between it and the base member 210.

[0017] The first biasing member, biasing spring 410, has one end hooked onto the locking portion (mounting position) 221 of the holding member 220 (i.e., mounted), and the other end hooked onto the locking portion 211 of the base member 210. The second biasing member, biasing spring 420, has one end hooked onto the locking portion 222 of the holding member 220, and the other end hooked onto the locking portion 212 of the base member 210. The biasing springs 410 and 420 are tension coil springs and bias the holding member 220 toward the base member 210. As a result, the holding member 220 is pressed against the base member 210 via the balls 310, 320, and 330, and is positioned in the optical axis direction. In addition, the balls 310, 320, and 330 are always in contact with the holding member 220 and the base member 210, regardless of the orientation of the lens unit 13 (camera body 11). This allows the holding member 220 to be moved (shifted) in the shift plane relative to the base member 210 without changing the relative position of the holding member 220 and the base member 210 in the optical axis direction, regardless of the orientation.

[0018] A retaining plate 240 is fixed to the base member 210 by screws 241, with the retaining plate 240 positioned between the base member 210 and the retaining member 220. The retaining plate 240 is provided to prevent the retaining member 220 and the balls 310, 320, and 330 from falling off the base member 210.

[0019] The vibration isolation unit 14 is provided with two actuators that shift the holding member 220 (correction lens 230) in mutually orthogonal directions within the shift plane: a yaw direction (first direction) and a pitch direction (second direction). These two actuators are a yaw actuator (first actuator) and a pitch actuator (second actuator). The yaw and pitch actuators are positioned equidistant from each other from the optical axis of the correction lens 230 in the non-shifted state (hereinafter referred to as the neutral optical axis) when viewed in the direction of the optical axis, and are positioned 90° apart in phase with respect to the neutral optical axis. Each actuator consists of a shift magnet 510, a yoke 520, and a shift coil 530.

[0020] The shift magnet 510 is held by the retaining member 220. The yoke 520 is fixed to the retaining member 220 by being attracted to the shift magnet 510. The shift magnet 510 and the yoke 520 correspond to the first drive members. The shift coil 530 is held by the base member 210. The shift coil 530 corresponds to the second drive member. When current is supplied to the respective shift coils 530 of the yaw and pitch actuators, the electromagnetic interaction between the shift coils 530 and the shift magnet 510 causes the retaining member 220 to shift relative to the base member 210 in the yaw and pitch directions.

[0021] Furthermore, the vibration isolation unit 14 is provided with two position detection sensors that detect the position of the holding member 220 (correction lens 230) in the yaw direction and pitch direction within the shift plane. These yaw and pitch position detection sensors are positioned at positions equidistant from the neutral optical axis and with a phase difference of 90° around the neutral optical axis when viewed in the optical axis direction in the non-shift state. Each position detection sensor consists of a sensor magnet 610 held by the holding member 220 and a Hall element 620 held by the base member 210. The Hall element 620 outputs a signal corresponding to the change in magnetism received from the sensor magnet 610 due to the shift of the holding member 220. The drive control unit 15 acquires the shift position of the holding member 220 in the yaw direction and pitch direction based on the signals output from the Hall elements 620 of the yaw and pitch position detection sensors.

[0022] Figure 4 shows the vibration isolation unit 14 as seen from the subject side with the retaining plate 240 removed. Figure 5 shows only the movable unit 700, which consists of the corrective lens 230, holding member 220, yaw / pitch actuator (shift magnet 510 and yoke 520), and sensor magnet 610, as seen from the subject side. The Y direction indicates the yaw direction, and the P direction indicates the pitch direction.

[0023] As shown in these figures, the center of gravity × of the movable unit 700 is shifted from the neutral optical axis O to the side (lower right in the figures) where the yaw and pitch actuators, which have a large mass within the movable unit 700, are located.

[0024] The movable unit 700, including the retaining member 220, is biased toward the base member 210 by the biasing springs 410 and 420 described above. In this embodiment, the biasing springs 410 and 420 are identical tension coil springs and are attached (hanged) between the retaining member 220 and the base member 210 with the same length (in a tensile state). The biasing springs 410 and 420 are positioned on opposite sides of the corrective lens 230.

[0025] Furthermore, the locking portions 221 and 211 on the holding member 220 and base member 210, to which the biasing spring 410 is attached, are located within the shaded area in Figure 5. The shaded area is the centroid-side region where the centroid × is located, which is one of two regions enclosed by a circle C centered on the neutral optical axis O and passing through the outermost part (outermost diameter point) of the holding member 220, and the two radii R1 and R2 of the above circle that extend from the neutral optical axis O toward the shift magnet 510 in the P and Y directions. The centroid-side region can also be described as the region with the smaller central angle θ between radii R1 and R2 of the two regions. In this embodiment, the central angle θ of the shaded area is 90°.

[0026] If an external force such as an impact causes a reaction force exceeding the biasing force of the biasing springs 410 and 420 to be applied to the movable unit 700, the movable unit 700 will lift up relative to the base member 210 in the optical axis direction. If the position of the movable unit 700 in the optical axis direction changes due to this lifting, the optical properties and controllability may deteriorate, and the impact when it is pulled back due to the absence of a reaction force may cause dents on the balls 310, 320, and 330. For this reason, it is necessary to prevent the movable unit 700 from lifting up relative to the base member 210.

[0027] Figures 6 and 7 show the state in which the movable unit 700 is subjected to acceleration in the optical axis direction due to the action of an external force. As shown in Figure 6, the external force F acts on the movable unit 700 with its center of gravity × as the center. F1 to F3 in Figure 7 represent the components of the external force F at the positions where the balls 310, 320, and 330 contact the movable unit 700, and F = F1 + F2 + F3. The ratio of F1 to F3 is determined by the distance between the center of gravity × of the movable unit 700 and the contact positions of the balls 310, 320, and 330 (hereinafter referred to as the ball contact positions) in the optical axis direction view. The closer the ball contact positions are to the center of gravity ×, the larger the component force, and the further they are from the center of gravity ×, the smaller the component force. In other words, the ease with which the movable unit 700 floats differs depending on the ball contact position. In this embodiment, the largest component force F1 acts on the contact point of the ball 310, which is closest to the center of gravity × of the movable unit 700, and the movable unit 700 is most likely to lift up at this position.

[0028] Figures 9 and 10 show the state in which the resultant force f of the biasing forces from the biasing springs 410 and 420 (hereinafter referred to as the resultant bias force) acts on the movable unit 700. As shown in Figure 9, the resultant bias force f acts on the point of application ★ in the movable unit 700. The point of application ★ of the resultant bias force f is located in a position different from the neutral optical axis (simply labeled as the optical axis in the figure) and the center of gravity × within the region on the side of the center of gravity. In Figure 10, f1 to f3 show the component forces of the resultant bias force f at the three ball contact positions (hereinafter referred to as the bias component forces), and f = f1 + f2 + f3. The ratio of f1 to f3 is determined by the distance between the point of application ★ of the resultant bias force f and each ball contact position when viewed in the direction of the optical axis. The closer the ball contact position is to the point of application ★, the larger the component force, and the further away it is from the point of application ★, the smaller the component force.

[0029] By setting the point of application ★ of the combined biasing force f to a position close to the center of gravity ×, the ratio of the biasing components f1 to f3 to the combined biasing force f can be brought closer to the ratio of the components F1 to F3 to the external force F. With this setting, the movable unit 700 can be given biasing components f1 to f3 of a magnitude corresponding to the ease with which each ball contact position lifts up, and the movable unit 700 can be biased stably. In this embodiment, by bringing the point of application ★ of the combined biasing force f closer to the center of gravity ×, the ratio of the biasing component f1 is set to be larger than the ratio of the other biasing components f2 and f3.

[0030] Furthermore, in the vibration isolation unit 14 as seen from the subject side as shown in Figure 8, the direction in which the straight line L connecting the neutral optical axis O and the biasing springs 410 and 420 extends coincides with the direction in which the straight line connecting the neutral optical axis O and the center of gravity × extends. In other words, by changing the position of the biasing springs 410 and 420 radially from the neutral optical axis O, the point of application of the resultant biasing force f ★ can be easily brought closer to the center of gravity × without interfering with the arrangement space of surrounding components.

[0031] As described above, according to this embodiment, a compact vibration isolation unit can be realized while providing a spring bias that can stably suppress the lifting of the movable unit 700.

[0032] Figures 11 and 12 show the state in which the movable unit 700 is shifted in the Y direction and P direction relative to the base member 210, as viewed from the subject side. In these figures, the shift magnet 510 receives a yaw driving force Fy and a pitch driving force Fp when the shift coil 530 is energized. Also, in Figure 11, the biasing springs 410 and 420 are deformed by extension in the Y direction, respectively, generating reaction forces Fsy1 and Fsy2 to the yaw driving force Fy. In Figure 12, the biasing springs 410 and 420 are deformed by extension in the P direction, respectively, generating reaction forces Fsp1 and Fsp2 to the pitch driving force Fp.

[0033] The yaw drive force Fy and the pitch drive force Fp are controlled to shift the movable unit 700 to the target position against Fsy1, Fsy2 and reaction forces Fsp1, Fsp2, respectively. Therefore, Fy≧Fsy1+Fsy2 Fp ≥ Fsp1 + Fsp2 Therefore, in the view along the optical axis, the lines of action of Fy, Fp, Fsp1, Fsp2, and Fsp1 and Fsp2 (shown as dashed lines in the figure) do not pass through the center of gravity × of the movable unit 700. As a result, these forces generate a moment that causes the movable unit 700 to rotate (roll) around the center of gravity × in a plane perpendicular to the optical axis. When the movable unit 700 rolls, the Hall element 620 detects the position change due to the roll, which may interfere with the control of the shift position of the movable unit 700. Therefore, it is necessary to suppress the rolling of the movable unit 700.

[0034] As shown in Figure 11, when the movable unit 700 is shifted in the Y direction, Fy and Fsy1 generate a moment that rotates the movable unit 700 clockwise around the center of gravity ×, and Fsy2 generates a moment that rotates the movable unit 700 counterclockwise.

[0035] As shown in Figure 12, when the movable unit 700 is shifted in the P direction, Fp and Fsp1 generate moments that rotate the movable unit 700 clockwise around the center of gravity ×, and Fsp2 generates a moment that rotates the movable unit 700 counterclockwise.

[0036] Therefore, by increasing the moments generated by Fsy2 and Fsp2, the rolling of the movable unit 700 can be suppressed. Even when the movable unit 700 is shifted in the opposite direction to that shown in Figures 11 and 12, only the direction of each moment is reversed, so by increasing the moments generated by Fsy2 and Fsp2, the rolling of the movable unit 700 can be suppressed.

[0037] In Figure 11, ly1 is the distance in the P direction from the center of gravity × to the biasing spring 410 (Fsy1), and ly2 is the distance in the P direction from the center of gravity × to the biasing spring 420 (Fsy2). In Figure 12, lp1 is the distance in the Y direction from the center of gravity × to the biasing spring 410 (Fsp1), and lp2 is the distance in the Y direction from the center of gravity × to the biasing spring 420 (Fsp2). In this embodiment, in both the Y direction and the P direction, the distances ly2 and lp2 from the center of gravity × to the biasing spring 420 are set to be larger than the distances ly1 and lp1 from the center of gravity × to the biasing spring 410. That is, ly1 <ly2 lp1 <lp2 In other words, in this embodiment, when the moment around the center of gravity generated by the biasing force received by the movable unit 700 from the biasing spring 410 is M1, and the moment around the center of gravity generated by the biasing force received from the biasing spring 420 is M2, M1 <M2 The following conditions are satisfied. This setting makes the moment M2 generated by Fsy2 and Fsp2 greater than the moment M1 generated by Fsy1 and Fsp1, thereby suppressing the rolling of the movable unit 700.

[0038] As described above, according to this embodiment, the rolling of the movable unit 700 due to spring biasing can be suppressed.

[0039] In the above embodiment, the case in which the lifting and rolling of the holding member are suppressed by using the same spring as the two biasing springs 410 and 420 was described, but as shown in Figure 15, two biasing springs with different spring constants or elastic moduli may be used. Note that elastic members also include things other than springs.

[0040] Furthermore, as shown in Figure 16, the lengths of the biasing springs 410 and 420 in the optical axis direction (the length between the mounting positions of the holding member 220 and the base member 210) in the neutral state may be different from each other. In addition, as shown in Figure 17, the lengths of the biasing springs 410 and 420 in the shift direction (the direction perpendicular to the optical axis of the corrective lens) in the neutral state may be different from each other.

[0041] Furthermore, while the above embodiment described a digital camera as an optical device, embodiments of the present invention also include various optical devices having optical image stabilization devices, such as mobile phones and binoculars. In addition, while the above embodiment described an optical image stabilization device that shifts the lens to correct image shake, embodiments of the present invention also include an optical shift device that shifts the lens for purposes other than image shake correction. [Explanation of symbols]

[0042] 11 Digital Cameras 12 Image sensor 13 Lens Unit 14 Vibration isolation unit 210 Base member 220 Retaining member 230 Correction Lens 310, 320, 330 balls 410,420 biasing spring 510 Shift Magnet 520 York 530 Shift Coil 700 movable units

Claims

1. Base member and A retaining member that holds the lens, A first biasing member and a second biasing member are respectively attached between the holding member and the base member, and bias the holding member toward the base member, Each comprises a first drive member held by the holding member and a second drive member held by the base member, and has a first actuator and a second actuator that move the holding member relative to the base member in a first direction and a second direction that are perpendicular to the optical axis of the lens and perpendicular to each other. When the holding member, which is in a non-moving state relative to the base member, is viewed from the direction of the optical axis extending along the optical axis, When two regions are enclosed by a circle centered on the optical axis and passing through the outermost part of the holding member, and the two radii of the circle extending from the optical axis toward the first and second actuators, respectively, the region where the center of gravity of the holding member holding the lens and the first drive member is located is defined as the center of gravity region, The first biasing member is positioned within the center of gravity region, and the second biasing member is positioned on the opposite side of the lens from the first biasing member. An optical shift device characterized in that the point of application of the resultant force of the biasing forces received by the first and second biasing members on the holding member is at a position different from the optical axis within the centroid region.

2. The optical shift device according to claim 1, characterized in that the centroid region is the region of the two regions in which the central angle formed by the two radii is smaller.

3. The optical shift device according to claim 1 or 2, characterized in that the point of application is located at a position different from the center of gravity within the center of gravity region.

4. In a plane perpendicular to the optical axis when the holding member has moved relative to the base member, let M1 be the moment around the center of gravity generated by the biasing force the holding member receives from the first biasing member, and let M2 be the moment around the center of gravity generated by the biasing force the holding member receives from the second biasing member. M1 < M2 An optical shift device according to any one of claims 1 to 3, characterized in that it satisfies the following conditions.

5. The optical shift device according to any one of claims 1 to 3, characterized in that, in the holding member viewed from the optical axis direction, the distance from the center of gravity to the position where the first biasing member is attached is shorter than the distance from the center of gravity to the position where the second biasing member is attached.

6. It has a plurality of balls arranged between the base member and the holding member, The optical shift device according to any one of claims 1 to 5, characterized in that, in the holding member viewed from the optical axis direction, the position in which one of the plurality of balls contacts is within the centroid-side region.

7. The optical shift device according to any one of claims 1 to 6, characterized in that the spring constants or elastic moduli of the first and second biasing members are different from each other.

8. The optical shift device according to any one of claims 1 to 6, characterized in that, in the non-moving state, the lengths of the first and second biasing members in the optical axis direction are different from each other.

9. The optical shift device according to any one of claims 1 to 6, characterized in that, in the non-moving state, the lengths of the first and second biasing members in the direction perpendicular to the optical axis are different from each other.

10. An optical instrument characterized by having an optical shift device according to any one of claims 1 to 9.

11. The optical device according to claim 10, characterized in that the optical shift device moves the holding member in order to correct image shake caused by vibration applied to the optical device.

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