Optical instrument

Abstract

To provide a small-sized optical instrument.SOLUTION: An optical instrument (101) has a lens unit (111), a base member (501), a shift member (506) that is movable in a direction orthogonal to an optical axis (OA) of the lens unit relative to the base member, and an urging member (509) that urges the shift member in an optical axis direction relative to the base member. The lens unit has an extension part (514) extending in a direction parallel to the optical axis, and in a plane orthogonal to the optical axis, the extension part and the urging member are arranged to overlap each other in a radial direction centered on the optical axis.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to optical instruments. [Background technology]

[0002] In optical devices such as digital cameras, video cameras, and interchangeable lenses, there is a demand for miniaturization of the lens barrel in the radial direction and overall length. Patent Document 1 discloses an image blur correction device in which rolling balls and springs are arranged to overlap when viewed from the optical axis direction in order to reduce the radial size of the lens barrel. Patent Document 2 discloses an image blur correction device in which grooves that engage with lens groups and springs are arranged to overlap when viewed from the optical axis direction in order to reduce the radial size of the lens barrel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-105899 A [Patent Document 2] JP 2023-025876 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the image blur correction device disclosed in Patent Document 1, the inner diameter of the cylindrical member arranged on the outer periphery must be set outside the spring hook, making it difficult to further reduce the size.In the image blur correction device disclosed in Patent Document 2, the grooves that engage with other lens groups cannot be arranged to overlap with the springs, so there is a limit to how much the overall length of the lens barrel can be shortened, making it difficult to further reduce the size.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a compact optical device. [Means for solving the problem]

[0006] An optical instrument according to one aspect of the present invention comprises a lens unit, a base member, a shift member movable relative to the base member in a direction perpendicular to the optical axis of the lens unit, and a biasing member which biases the shift member in the optical axis direction relative to the base member, wherein the lens unit has an extension portion extending in a direction parallel to the optical axis, and within a plane perpendicular to the optical axis, the extension portion and the biasing member are arranged to overlap each other in a radial direction centered on the optical axis.

[0007] Other objects and features of the present invention are illustrated in the following examples. Effect of the Invention

[0008] According to the present invention, a small-sized optical device can be provided. [Brief description of the drawings]

[0009] [Figure 1] 1 is an external view of an imaging system according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a block diagram of an imaging system according to an embodiment of the present invention. [Diagram 3] 2 is a cross-sectional view of the interchangeable lens (wide-angle end) in the present embodiment. [Figure 4] 2 is a cross-sectional view of the interchangeable lens (telephoto end) in the present embodiment. [Diagram 5] 2 is a cross-sectional view of the interchangeable lens (at the retracted end) in the present embodiment. FIG. [Figure 6] FIG. 2 is an exploded perspective view of the interchangeable lens according to the present embodiment. [Figure 7] FIG. 2 is an exploded perspective view of a vibration isolation group and peripheral members in the embodiment. [Figure 8] FIG. 2 is a cross-sectional view of a lens barrel configuration in the present embodiment. [Figure 9] FIG. 4 is a rear view of the vibration isolation group and peripheral members in the embodiment. [Figure 10] 3 is a cross-sectional view of a vibration isolation group and peripheral members in the embodiment. FIG. [Figure 11]FIG. 4 is a right side view of the vibration isolation group and peripheral members in the embodiment. [Figure 12] 3 is a cross-sectional view of a vibration isolation group and peripheral members in a direction perpendicular to the optical axis in the present embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the same reference numerals are used for the same components, and duplicated explanations will be omitted. Note that in this embodiment, an interchangeable lens (lens device) will be described as an example of an optical device, but this embodiment is not limited to this, and can be applied to other optical devices such as a lens-integrated camera.

[0011] 1(a) and (b) are external views of an imaging system (camera system) 100 in this embodiment, with Fig. 1(a) being a perspective view seen from the front side and Fig. 1(b) being a perspective view seen from the back side. The imaging system 100 is configured with a camera body (digital camera, imaging device) 1 and an interchangeable lens (lens device, optical equipment) 101 that is detachable from the camera body 1.

[0012] As shown in Fig. 1(a), the direction in which the optical axis of the imaging optical system housed in the interchangeable lens 101 extends (optical axis direction) is defined as the X-axis direction, and two directions that are perpendicular to the optical axis and perpendicular to each other are defined as the Z-axis direction (horizontal direction) and the Y-axis direction (vertical direction). Hereinafter, the Z-axis direction and the Y-axis direction are collectively referred to as the Z / Y-axis direction. In addition, the rotation direction around the Z axis is defined as the pitch direction, and the rotation direction around the Y axis is defined as the yaw direction. The pitch direction and yaw direction (pitch / yaw direction) are the rotation directions around two axes, the Z axis and the Y axis, which are perpendicular to each other.

[0013] A grip section 2 is provided on the left side (right side when viewed from the rear side) of the camera body 1 when viewed from the front side (subject side) for the user to hold the camera body 1 with his / her hand. A power supply operation section 3 is also provided on the top surface of the camera body 1. When the user turns on the power supply operation section 3 while the camera body 1 is in the power-off state, electricity is started and the camera body 1 is turned on, and a computer program such as an origin detection process for the focus group is executed, and the camera body 1 is in a standby state for shooting. On the other hand, when the user turns off the power supply operation section 3 while the camera body 1 is in the power-on state, the camera body 1 is turned off.

[0014] A mode dial 4, a release button 5, and an accessory shoe 6 are provided on the top surface of the camera body 1. The user can switch between imaging modes by rotating the mode dial 4. The imaging modes include a manual still image imaging mode in which the user can arbitrarily set imaging conditions such as shutter speed and aperture value, an auto still image imaging mode in which an appropriate exposure amount is automatically obtained, and a video imaging mode for capturing videos. In addition, the user can instruct imaging preparation operations such as autofocus and auto exposure control by half-pressing the release button 5, and can instruct imaging by fully pressing the button. Accessories such as an external flash and an external viewfinder (EVF), not shown, are detachably attached to the accessory shoe 6. In addition, an imaging element that photoelectrically converts (captures) a subject image formed by an imaging optical system in the interchangeable lens 101 is provided in the camera body 1.

[0015] The interchangeable lens 101 is mechanically and electrically connected to the camera mount 7 provided on the camera body 1 via a lens mount (mount unit) 102. As described above, the interchangeable lens 101 houses an imaging optical system that forms an image of a subject by focusing light from the subject. The outer periphery of the interchangeable lens 101 is provided with a zoom ring 103 that can be rotated around an optical axis by a user's operation. The outer periphery of the zoom ring 103 is provided with a knurled shape to prevent the user's hand from slipping when operating it. When the zoom ring 103 is rotated by the user, the zoom group that constitutes the imaging optical system moves to a predetermined optical position corresponding to the angle of the zoom ring 103. This allows the user to take a picture at a desired angle of view.

[0016] As shown in FIG. 1(b), a rear operation unit 8 and a display unit 9 are provided on the rear of the camera body 1. The rear operation unit 8 includes a plurality of buttons and dials to which various functions are assigned. When the power of the camera body 1 is on and a still image or video imaging mode is set, a through image of a subject image captured by an imaging element is displayed on the display unit 9. The display unit 9 also displays imaging parameters indicating imaging conditions such as shutter speed and aperture value (F value), and the user can change the setting values ​​of the imaging parameters by operating the rear operation unit 8 while viewing the display. The rear operation unit 8 includes a playback button for instructing playback of a recorded captured image, and the captured image is played back and displayed on the display unit 9 by the user operating the playback button.

[0017] 2 is a block diagram showing the electrical and optical configuration of the imaging system 100. The camera body 1 has a power supply unit 10 that supplies power to the camera body 1 and the interchangeable lens 101, the power operation unit 3 described above, a mode dial 4, a release button 5, and an operation unit 11 that includes a rear operation unit 8 and a touch panel function of the display unit 9. The camera body 1 and the interchangeable lens 101 as a whole system are controlled by a camera control unit 12 provided in the camera body 1 and a lens control unit 104 provided in the interchangeable lens 101 in cooperation with each other.

[0018] The camera control unit 12 reads out and executes a computer program stored in the storage unit 13. In so doing, the camera control unit 12 communicates various control signals, data, and the like with the lens control unit 104 via a communication terminal of an electrical contact 105 provided on a lens mount 102 connectable to the camera body 1. The electrical contact 105 includes a power terminal that supplies power from the power supply unit 10 described above to the interchangeable lens 101.

[0019] The imaging optical system of the interchangeable lens 101 includes a zoom group 110 that is connected to the zoom operation ring 103 and moves in the optical axis direction to change the angle of view, and an anti-vibration group 112 that includes a shift lens as an anti-vibration element that reduces image blur. The anti-vibration group 112 performs an anti-vibration operation to reduce image blur by moving (shifting) the shift lens in the Z / Y axis direction perpendicular to the optical axis OA. The imaging optical system also includes an aperture group (aperture diaphragm) 301 that performs a light amount adjustment operation, and a focus group 114 that is a moving lens group including a focus lens that moves in the optical axis direction to adjust the focus. The interchangeable lens 101 also includes an anti-vibration driver 201 that drives the anti-vibration group 112 to shift the shift lens, an aperture driver 302 that drives the aperture group 301, and a focus driver 401 that drives the focus group 114 to move the focus lens.

[0020] The camera body 1 has a shutter unit 14, a shutter drive section 15, an image sensor 16, an image processing section 17, and the camera control section 12 described above. The shutter unit 14 controls the amount of light collected by the image sensor 16 through the image sensor 16 and exposed to the light. The image sensor 16 has a CMOS (Complementary Metal-Oxide-Semiconductor) sensor or the like, and performs photoelectric conversion on the subject image (optical image) formed by the image sensor 16, and outputs an image signal. The image processing section 17 performs various image processes on the image signal, and then generates an image signal. The display section 9 displays the image signal (through image) output from the image processing section 17, displays the image sensor parameters described above, or reproduces and displays the captured image recorded in the memory section 13 or a recording medium (not shown).

[0021] The camera control unit 12 controls the focus driving unit 401 in response to an image capture preparation operation (half-press operation) on the operation unit 11 (release button 5). For example, when an autofocus operation is instructed, the focus detection unit 18 determines the focus state of the subject image formed by the image sensor 16 based on the image signal generated by the image processing unit 17, generates a focus signal, and transmits it to the camera control unit 12. At the same time, the focus driving unit 401 detects the current position of the focus group 114 and transmits the signal to the camera control unit 12 via the lens control unit 104. The camera control unit 12 compares the focus state of the subject image with the current position of the focus group 114, calculates the focus driving amount from the amount of deviation, and transmits it to the lens control unit 104. Then, the lens control unit 104 drives and controls the focus group 114 to a target position via the focus driving unit 401, and corrects the focus deviation of the subject image.

[0022] The focus drive unit 401 has a focus motor (not shown) and a photointerrupter (not shown) that detects the origin position of the focus group 114. Generally, a stepping motor, which is a type of actuator, is often used as the focus motor. However, since a stepping motor can only control a relative driving amount, the current position of the focus group 114 becomes indefinite when the power supply to the camera body 1 is off. Even if the power supply to the camera body 1 is still on, if the interchangeable lens 101 is mechanically removed from the camera mount 7 of the camera body 1, for example, and power supply to the interchangeable lens 101 is interrupted, the focus group 114 is held in the position at the time of power supply being cut off and becomes undetectable.

[0023] When the user turns on the power supply operation unit 3 while the current position of the focus group 114 is indefinite, it is necessary to move the focus group 114 to the origin position and execute origin detection processing before the focus group 114 reaches the shooting standby state. Note that the control of the origin detection processing is a well-known technology that has been used in many optical devices, so a description thereof will be omitted here. A DC motor or an ultrasonic motor equipped with an encoder may be used as the actuator. Also, the photointerrupter directly receives the light emitted from the light-emitting unit at the light-receiving unit, but instead of this, a photoreflector that receives the reflected light from a reflecting surface, or a brush that contacts a conductive pattern to electrically detect a signal may be used.

[0024] Furthermore, camera control unit 12 controls the driving of aperture group 301 and shutter unit 14 via aperture drive unit 302 and shutter drive unit 15 in response to the setting values ​​of aperture value and shutter speed received from operation unit 11. For example, when an automatic exposure control operation is instructed, camera control unit 12 receives a luminance signal generated by image processing unit 17 and performs photometric calculation. Based on the result of this photometric calculation, camera control unit 12 controls aperture drive unit 302 in response to a shooting instruction operation on operation unit 11 (such as a full press of release button 5). At the same time, camera control unit 12 controls the driving of shutter unit 14 via shutter drive unit 15 and performs exposure processing by image sensor 16.

[0025] The camera body 1 has a pitch shake detection unit 19 and a yaw shake detection unit 20 as shake detection means capable of detecting image shake caused by a user's hand shake or the like. The pitch shake detection unit 19 and the yaw shake detection unit 20 respectively use an angular velocity sensor (vibration gyro) and an angular acceleration sensor to detect image shake in the pitch direction (rotation direction around the Z axis) and the yaw direction (rotation direction around the Y axis) and output a shake signal. The camera control unit 12 calculates the shift position of the vibration isolation group 112 in the Y axis direction using the shake signal from the pitch shake detection unit 19. Similarly, the camera control unit 12 calculates the shift position of the vibration isolation group 112 in the Z axis direction using the shake signal from the yaw shake detection unit 20. Then, the camera control unit 12 moves the vibration isolation group 112 to a target position in the Z / Y axis direction via the vibration isolation drive unit 201 according to the calculated shift position in the pitch / yaw direction, and performs a vibration isolation operation to reduce image shake during exposure or during display of a through image.

[0026] The interchangeable lens 101 has a zoom ring 103 for changing the angle of view of the imaging optical system, and a zoom detection unit 106 for detecting the angle of the zoom ring 103. The zoom detection unit 106 detects the angle of the zoom ring 103 operated by the user as an absolute value, and is configured using, for example, a resistive linear potentiometer. Information on the angle of view detected by the zoom detection unit 106 is transmitted to the lens control unit 104, and is reflected in various controls by the camera control unit 12 described above. Meanwhile, part of the various pieces of information are recorded in the storage unit 13 or a recording medium together with the captured image.

[0027] Next, the positional relationship of the main components of the interchangeable lens 101 will be described with reference to FIG. 3, FIG. 4, and FIG. 5. FIG. 3 is a cross-sectional view of the interchangeable lens 101 at the wide-angle end. FIG. 4 is a cross-sectional view of the interchangeable lens 101 at the telephoto end. FIG. 5 is a cross-sectional view of the interchangeable lens 101 at the retracted end. FIG. 3 to FIG. 5 are cross-sectional views on an XY plane including the optical axis OA, and the center line shown here is approximately the same as the optical axis OA determined by the imaging optical system, and therefore is hereinafter synonymous with the optical axis OA. FIG. 3 and FIG. 4 respectively show the wide-angle end on the short focal side and the telephoto end on the long focal side during shooting in zoom, both of which are in a state where shooting is possible. On the other hand, FIG. 5 shows the retracted end in a non-shooting state, in which the total length is shortened to the shortest in the direction along the optical axis OA (optical axis direction).

[0028] As shown in Fig. 3 and Fig. 4, in this embodiment, a six-group configuration is adopted as an example of an imaging optical system, and the zoom group 110 moves to a different predetermined usage position at the wide-angle end and the telephoto end, and forms an image of light from a subject on the imaging element 16. The zoom group 110 is composed of a first zoom group 111, an anti-vibration group 112 functioning as a second zoom group, an aperture group 301, a third zoom group 113, a focus group 114 functioning as a fourth zoom group, a fifth zoom group 115, and a sixth zoom group 116. Note that this embodiment does not limit the configuration of the imaging optical system, and for example, the anti-vibration group 112 or the focus group 114 may function as another zoom group. In addition, some lens groups may not be movable but may be fixed.

[0029] The linear guide barrel 107 is a fixed component fixed to the lens mount 102 via a fixed barrel 109. Cam grooves 107a are formed at equal intervals on the outer peripheral surface of the linear guide barrel 107. The cam barrel (cylindrical body) 108 is disposed outside the first zoom group 111 in the radial direction. A cam follower (engagement portion) 108a is provided on the inner peripheral side of the cam barrel 108. The cam barrel 108 is connected to the zoom operation ring 103 via a key (not shown). When the zoom operation ring 103 is rotated, the cam barrel 108 advances and retreats in the optical axis direction while rotating about the optical axis OA due to the engagement between the cam groove 107a and the cam follower 108a.

[0030] The linear guide barrel 107 has linear guide grooves 117 formed at equal intervals to restrict movement of the zoom group 110 in the rotation direction and guide linear movement in the optical axis direction. The cam barrel 108 has cam grooves 107a formed at equal intervals to correspond to the zoom group 110 and have trajectories at different angles in the rotation direction. On the other hand, the zoom group 110 is provided with a plurality of cam followers 108a, and each cam follower 108a fits into the corresponding linear guide groove 117 and cam groove 107a. When the user rotates the zoom operation ring 103, the cam barrel 108 rotates, and the cam follower 108a moves the zoom group 110 forward and backward in the optical axis direction while restricting movement in the rotation direction by fitting the linear guide groove 117 into the cam groove 107a.

[0031] 6 is an exploded perspective view of the interchangeable lens 101, showing a state in which some of the components have been disassembled and viewed obliquely from the front. Cam followers 108a for the vibration isolation group 112 and the third zoom group 113 are provided in the linear guide 118. A linear guide groove 117 is provided on the inside of the linear guide barrel 107, and engages with the linear guide 118 to restrict rotation of the vibration isolation group 112 and the third zoom group 113 about the optical axis.

[0032] FIG. 7 is an exploded perspective view of the vibration isolation group 112 and peripheral members, showing a state in which some of the components are disassembled and viewed from diagonally behind. FIG. 8 is a cross-sectional view of the lens barrel configuration. The base member 501 is connected to the third zoom group 113. The coil 502 is connected to the base member 501 and wired to the lens control unit 104. The shield case 503 is connected to the base member 501 and covers the image surface side of the coil 502, with the object side being open. The ball 504 is housed in the base member 501. The lens 505 of the vibration isolation group 112 is a component of the vibration isolation group 112 (at least one lens in the vibration isolation group 112).

[0033] The shift member 506 holds the lens 505 of the vibration isolation group 112, and is in contact with the ball 504. The magnet 507 is connected to the shift member 506, and is disposed facing the coil 502 in the optical axis direction. The yoke 508 is connected to the magnet 507. The spring hook portion 511 of the base member 501 extends from the base member 501. The spring hook portion 512 of the shift member 506 extends from the shift member 506.

[0034] The spring 509 is an elastic tension spring (biasing member, elastic member) having a first hook and a second hook. The first hook of the spring 509 engages with a spring hook portion 511 of the base member 501. The second hook of the spring 509 engages with a spring hook portion 512 of the shift member 506. The spring 509 is arranged so that the longitudinal direction of the spring 509 is approximately parallel to the optical axis direction. This causes the shift member 506 to be biased in the optical axis direction by the base member 501. In addition, the lens control unit 104 applies a current to the coil 502, thereby allowing the shift member 506 to move as a voice coil type actuator in a direction perpendicular to the optical axis OA (a direction intersecting the optical axis OA) relative to the base member 501.

[0035] The base member 501 is provided with wiring for passing a current through the coil 502. The cover member 510 is disposed between the first zoom group 111 and the shift member 506, and restricts the wiring from floating up in the optical axis direction. The cover member 510 is also provided with a standing wall portion 513 extending in a direction parallel to the optical axis OA, and can reduce stray light passing through the spring hook portion 511 of the base member 501 to the image sensor 16.

[0036] Fig. 9 is a rear view of the vibration isolation group 112 and peripheral members, showing some selected parts of the interchangeable lens 101. Fig. 10 is a cross-sectional view of the vibration isolation group 112 and peripheral members, showing a cross-section taken along line AA in Fig. 9. Fig. 11 is a right side view of the vibration isolation group 112 and peripheral members, showing some selected parts of the interchangeable lens 101. Fig. 12 is a cross-sectional view of the vibration isolation group 112 and peripheral members in a direction perpendicular to the optical axis OA, showing a cross-section taken along line BB in Fig. 11.

[0037] The first zoom group (lens unit) 111 has an extension portion 514 extending in a direction substantially parallel to the optical axis OA. In this embodiment, the extension portion 514 includes three extension members arranged at 120 degrees intervals around the optical axis OA, but is not limited to this. Preferably, the extension portion 514 includes at least three extension members arranged at different positions in a plane perpendicular to the optical axis OA. The first zoom group 111 has a cam follower 108a via the extension portion 514.

[0038] The first zoom group (lens unit) 111 holds the corresponding cam followers 108a via a plurality of extensions 514. Each cam follower 108a fits into the corresponding linear guide groove 117 and cam groove 107a. When the user rotates the zoom operation ring 103, the cam barrel 108 rotates, and the cam follower 108a fits into the linear guide groove 117 and the cam groove 107a, thereby moving the first zoom group 111 forward and backward in the optical axis direction while restricting the movement of the first zoom group 111 in the rotational direction. In this way, the first zoom group 111 moves in the optical axis direction in response to the rotation of the cam barrel 108.

[0039] In a plane perpendicular to the optical axis OA, the extension portion 514 and the spring 509 are disposed so as to overlap each other in the radial direction centered on the optical axis OA. The extension portion 514 also extends in a direction substantially parallel to the optical axis OA. This allows the cam follower 108a of the first zoom group 111 to fit into the cam groove 107a of the cam barrel 108 that is separated in the optical axis direction. This allows each of the linear guide barrel 107 and the cam barrel 108 to be shortened in the optical axis direction, making it possible to shorten the overall length of the barrel.

[0040] Further, a recess 515 is formed in the extension portion 514. The recess 515 is formed so that the extension portion 514 does not interfere with the spring 509 that is hung on the spring hook portion 511 of the base member 501 and the spring hook portion 512 of the shift member 506. That is, the recess 515 and the spring 509 are arranged so as to overlap each other in the radial direction. Preferably, the recess 515 is formed so that the extension portion 514 and the spring 509 do not interfere with each other even when the vibration isolation group 112 moves in a direction perpendicular to the optical axis OA. More preferably, in a plane perpendicular to the optical axis OA, the maximum angle (opening angle of the recess) formed by two sides 516, 517 symmetrical to the center line CL (a line extending radially from the optical axis OA) of the recess 515 is 60 degrees or more. Furthermore, by forming the recess 515 in the extension portion 514, the rigidity of the first zoom group 111 can be increased, which is effective as a measure against impact such as dropping.

[0041] By configuring the spring 509 to be disposed inside the recess 515, the linear guide barrel 107 and the cam barrel 108 can be disposed further inward when viewed from the center of the optical axis OA. This makes it possible to reduce the size of the lens barrel in the radial direction.

[0042] During zooming, the relative positional relationship between the first zoom group (lens unit) 111 and the vibration-proof group (second zoom group) 112 in the optical axis direction varies. At that time, the recess 515 advances and retreats relative to the spring 509, so a space (gap) may be generated between the first zoom group 111 and the vibration-proof group 112. At this time, light rays that have passed through the first zoom group 111 may escape from the gap and leak from the spring hook portion 511 of the base member 501. For this reason, in this embodiment, it is preferable that a cover member 510 having a standing wall portion 513 is attached to the vibration-proof group 112. More preferably, the standing wall portion 513 is disposed closer to the optical axis OA than the spring 509 in the radial direction. The standing wall portion 513 provided on the cover member 510 can reduce stray light that passes through the spring hook portion 511 of the base member 501 and reaches the image sensor 16.

[0043] According to this embodiment, it is possible to provide an optical device in which the diameter or overall length of the barrel of an interchangeable lens or the like is reduced.

[0044] The disclosure of each embodiment includes the following configurations and methods. (Configuration 1) A lens unit; A base member; a shift member movable relative to the base member in a direction perpendicular to an optical axis of the lens unit; a biasing member that biases the shift member in the optical axis direction relative to the base member, The lens unit has an extension portion extending in a direction parallel to the optical axis, The optical device according to claim 1, wherein the extension portion and the biasing member are arranged to overlap each other in a radial direction centered on the optical axis within a plane perpendicular to the optical axis. (Configuration 2) 2. The optical device according to configuration 1, wherein the lens unit has an engagement portion via the extension portion. (Configuration 3) a cylindrical body disposed outside the lens unit in the radial direction, The cylindrical body has a groove formed therein to engage with the engaging portion, 3. The optical device according to configuration 2, wherein the lens unit advances and retreats in a direction parallel to the optical axis in response to rotation of the cylindrical body. (Configuration 4) 4. The optical device according to any one of configurations 1 to 3, wherein the extension portion includes at least three extension members arranged at different positions in the plane perpendicular to the optical axis. (Configuration 5) The optical device described in any one of configurations 1 to 4, characterized in that a recess is formed in the extension portion so that the extension portion and the urging member do not interfere with each other when the shift member moves in the direction perpendicular to the optical axis relative to the base member. (Configuration 6) 6. The optical device according to configuration 5, wherein the maximum angle formed by two sides symmetrical to the center line of the recess in the plane perpendicular to the optical axis is 60 degrees or more. (Configuration 7) a cover member disposed between the lens unit and the shift member; 7. The optical device according to any one of configurations 1 to 6, wherein the cover member is provided with an upright wall portion extending in a direction parallel to the optical axis. (Configuration 8) 8. The optical device according to claim 7, wherein the standing wall portion is disposed closer to the optical axis in the radial direction than the biasing member. (Configuration 9) 9. The optical device according to any one of configurations 1 to 8, wherein the optical device is an interchangeable lens that is detachably attached to an imaging device. (Configuration 10) 9. The optical device according to any one of configurations 1 to 8, wherein the optical device is an imaging device having an imaging element.

[0045] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention.

[0046] For example, the biasing member (elastic member) is not limited to the spring 509, and may be another biasing member such as a linear or strip-shaped elastic rubber material. The vibration isolation driving unit 201 may be configured to connect the coil 502 to the shift member 506, and connect the magnet 507 to the base member 501. This embodiment is not limited to the shooting state, and can also be applied to a stored state when not shooting. The extension portion 514 has been described as being provided in the first zoom group 111, but is not limited thereto, and may be provided in another lens unit such as the third zoom group 113. [Explanation of symbols]

[0047] 101 Interchangeable lenses (optical equipment) 501 Base material 506 Shifting parts 509 Spring (biasing member) 514 Extension section OA optical axis

Claims

1. A lens unit; A base member; a shift member movable relative to the base member in a direction perpendicular to an optical axis of the lens unit; a biasing member that biases the shift member in the optical axis direction relative to the base member, The lens unit has an extension portion extending in a direction parallel to the optical axis, The optical device according to claim 1, wherein the extension portion and the biasing member are disposed so as to overlap each other in a radial direction centered on the optical axis within a plane perpendicular to the optical axis.

2. The optical device according to claim 1 , wherein the lens unit has an engagement portion via the extension portion.

3. a cylindrical body disposed outside the lens unit in the radial direction, The cylindrical body has a groove formed therein to engage with the engaging portion, 3. The optical device according to claim 2, wherein the lens unit advances and retreats in a direction parallel to the optical axis in response to rotation of the cylindrical body.

4. 2. The optical device according to claim 1, wherein the extension portion includes at least three extension members arranged at different positions in the plane perpendicular to the optical axis.

5. The optical device according to claim 1, characterized in that a recess is formed in the extension portion so that the extension portion and the biasing member do not interfere with each other when the shift member moves in the direction perpendicular to the optical axis relative to the base member.

6. 6. The optical device according to claim 5, wherein the maximum angle formed by two sides symmetrical with respect to a center line of the recess in the plane perpendicular to the optical axis is 60 degrees or more.

7. a cover member disposed between the lens unit and the shift member; 2. The optical device according to claim 1, wherein the cover member is provided with an upright wall portion extending in a direction parallel to the optical axis.

8. The optical device according to claim 7 , wherein the standing wall portion is disposed closer to the optical axis than the biasing member is in the radial direction.

9. 9. The optical device according to claim 1, wherein the optical device is an interchangeable lens that is detachably attached to an imaging device.

10. 9. The optical device according to claim 1, wherein the optical device is an imaging device having an imaging element.

Images