Optical device and imaging system

Abstract

To provide an optical device that achieves miniaturization.SOLUTION: A lens barrel 10 has a 4A group lens barrel 122, a guide member 123a and a guide member 123b, and a rack spring 132. The 4A group lens barrel 122 includes a straight advance guide part 122G and a rotation regulation part 122d. A slide surface 122j of the straight advance guide part 122G sliding on the guide member 123a, is present within a range of ±90 degrees centered on a first axis from an intersection B of a straight line L drawn from the center of the first axis and an outer peripheral surface of the guide member 123a, in a direction of a reaction force to a resultant force F3 of a first force F1 exerted on the 4A group lens barrel 122 by the rack spring 132 and a second force F2 received by the rotation regulation part 122d from the guide member 123b. The straight advance guide part 122G has a notch part 122e within a range not including the slide surface 122j when seen in an optical axis direction. A part of the guide member 123a is present in the notch part 122e when seen in the optical axis direction. The guide member 123a overlaps the straight advance guide part 122G when seen in an optical axis orthogonal direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an optical device and an imaging system.

Background Art

[0002] There are known a lens barrel having a mechanism for moving a lens group using electrical driving means, and an imaging device including the lens barrel.

[0003] Patent Document 1 discloses a configuration in which backlash elimination of a transmission member connected to a linear ultrasonic motor and backlash elimination of a lens holding member and a guide bar are realized by one biasing member in order to reduce the size of the lens barrel.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the configuration disclosed in Patent Document 1, the fitting portion into which the guide bar fits is a sleeve hole (cylindrical shape), and since the peripheral members need to be arranged in consideration of the cylindrical portion, further miniaturization is difficult.

[0006] An object of the present invention is to provide an optical device that has been miniaturized.

Means for Solving the Problems

[0007] The present invention relates to an optical device having a first holding member that holds a first moving lens group, a first guiding member and a second guiding member that guide the first holding member in the optical axis direction, a first driving unit that drives the first holding member in the optical axis direction, a first connecting member that transmits the driving force of the first driving unit to the first holding member, and a first biasing member that biases the first holding member and the first driving unit and biases the first holding member and the first guiding member. The first holding member includes a first linear guiding portion that abuts against the first guiding member and is guided along a first axis parallel to the optical axis, and a first restricting portion that abuts against the second guiding member. The sliding surface of the first linear guiding portion that slides with respect to the first guiding member is within a range of ±90 degrees centered on the first axis from the intersection of the straight line drawn from the center of the first axis in the direction opposite to the resultant force of the first force exerted by the first biasing member on the first holding member and the second force received by the first restricting portion from the second guiding member and the outer peripheral surface of the first guiding member. The first linear guiding portion has a notch portion in a range that does not include the sliding surface when viewed in the optical axis direction, a part of the first guiding member or another member exists in the notch portion when viewed in the optical axis direction, and the first guiding member or the other member is arranged so as to overlap the first linear guiding portion when viewed in a direction orthogonal to the optical axis.

Advantages of the Invention

[0008] According to the present invention, it is possible to provide an optical device that has been miniaturized.

Brief Description of the Drawings

[0009]

Figure 1

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Figure 20

Mode for Carrying Out the Invention

[0010] Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

[0011] (Example 1) Hereinafter, the lens barrel 10 (optical device) according to Example 1 of the present invention and the imaging system 30 including the same will be described. FIG. 1 is a cross-sectional view showing the configuration of the lens barrel 10 (optical device) and the camera 20 that constitute the imaging system 30 of the embodiment of the present invention. The dashed-dotted line in the figure indicates the optical axis X.

[0012] The camera 20 has an imaging element 20a and is configured to be able to photograph an image formed through the lens barrel 10.

[0013] The lens barrel 10 is equipped with a mount 101, which can be connected and fixed to the mount of a camera 20 (not shown). The guide tube 102 is integrally fixed to the mount 101 together with the fixed tube 103. A cam ring 104 is rotatably held around the optical axis on the outer periphery of the guide tube 102. The cam ring 104 is connected to a zoom ring 105 rotatably held on the outer periphery of the guide tube 102 by a key member (not shown), and is configured to rotate integrally by operating the zoom ring 105 from the outside. A zoom sensor (not shown) is attached to the fixed tube 103. It is a sensor that can electrically detect the rotation angle of the zoom ring 105, and is electrically connected to a control board 107 arranged near the mount 101, transmitting the focal length information during zooming to the control circuit. A contact block 108 is electrically connected to the control board 107 and serves to communicate with the camera 20 and receive power supply.

[0014] The first-group lens L1 is fixed to the first-group lens barrel 111, and the first-group lens barrel 111 is fixed to the straight tube 112.

[0015] The second-group lens L2 is held by the second-group lens barrel 113, and the second-group lens barrel 113 is held movably in a plane orthogonal to the optical axis X by a shift unit 114. The shift unit 114 includes an actuator for driving the second-group lens barrel 113, a sensor for detecting the driving amount, etc., and is fixed to the guide tube 102. The shift unit 114 is electrically connected to the control board 107. The control board 107 drives and controls the second-group lens barrel 113 to correct shake based on the shake signal detected by an angular velocity sensor (not shown) attached to the fixed tube 103.

[0016] The third-group lens L3 is held by the third-group lens barrel 117 and fixed to the third-group base lens barrel 120 (barrel member). An electromagnetic diaphragm unit 121 is held by the third-group base lens barrel 120 and is electrically connected to the control board 107.

[0017] The 4A-group lens L4A (the first moving lens group) is held by the 4A-group lens barrel 122 (the first holding member), and the 4A-group lens barrel 122 is held by a guide member described later so as to be movable in the optical axis direction with respect to the 3-group base lens barrel 120. The 4A-group lens L4A is a lens for focus adjustment, and the 4A-group lens barrel 122 holding the 4A-group lens L4A is driven in the optical axis direction by a linear vibration wave motor 128 (the first driving unit) held by the 3-group base lens barrel 120.

[0018] The linear vibration wave motor 128 is composed of a fixed part 125 and a movable part 126, and drives the movable part 126 in the optical axis direction by causing a piezoelectric element to generate ultrasonic vibration, and is based on a well-known technique. The piezoelectric element is electrically connected to the control board 107 by a flexible printed board (not shown).

[0019] The 5th-group lens L5 is held by the 5-group lens barrel 127 (another member) and is fixed to the 3-group base lens barrel 120. The 6th-group lens L6 is held by the 6-group lens barrel 129.

[0020] The 1st-group lens L1, the 3rd-group lens L3, the 5th-group lens L5, and the 6th-group lens L6 are all lenses that move during zooming, and cam followers (not shown) are fixed to the straight tube 112, the 3-group base lens barrel 120, and the 6-group lens barrel 129. Each cam follower engages with a straight groove provided in the guide tube 102 and a cam groove provided in the cam ring 104, and is configured to be able to move straight in the optical axis direction by rotating the cam ring 104.

[0021] In addition, since the 4A-group lens L4A for focus adjustment is held by the 3-group base lens barrel 120, it is driven in the optical axis direction by the linear vibration wave motor 128 while moving together with the 3-group base lens barrel 120 during zooming.

[0022] Next, the configuration for holding and driving the 4A group lens barrel 122 will be described. FIG. 2(A) is an exploded perspective view of the 4A group lens barrel 122 and peripheral members. Further, FIG. 2(B) is a perspective view seen from another viewpoint in the configuration in which the peripheral members are assembled to the 4A group lens barrel 122. FIG. 3 is a front view of the configuration in which the peripheral members are assembled to the 4A group lens barrel 122 as seen from the imaging surface side. FIG. 4 is a front view of the 4A group lens barrel 122 as seen from the imaging surface side showing the forces acting on the 4A group lens barrel 122, with the description of the linear vibration wave motor 128 omitted. Further, FIG. 5 is an enlarged view of the range A of the broken line shown in FIG. 4.

[0023] The rack 131 (first connecting member) has a shaft portion 131a. The shaft portion 131a is inserted through the rack spring 132 (first biasing member). The rack 131 is inserted between the rack shaft holes 122a and 122b of the 4A group lens barrel 122 and is rotatably held around the axis of the shaft portion 131a. Further, the hook portion 132a of the rack spring 132 is hooked on the rack 131, and the opposite extension portion 132b is inserted into the spring hooking hole 122c provided in the 4A group lens barrel 122. With this configuration, the rack 131 is always biased in the direction of arrow Y1 shown in FIG. 3 with the shaft portion 131a as the rotation center. And the rack 131 is always engaged with a protrusion (not shown) provided on the movable portion 126 of the linear vibration wave motor 128 by the V-groove portion 131b at the tip. With this configuration, even if there are variations in component accuracy, the rack 131 can transmit the driving force of the linear vibration wave motor 128 to the 4A group lens barrel 122 without play due to the biasing force of the rack spring 132.

[0024] The guide member 123a (first guide member) and the guide member 123b (second guide member) are each fixed at both ends to the 3-group base lens barrel 120. The guide member 123a engages with the arc-shaped engaging portions 122h and 122i of the linear guide portion 122G (first linear guide portion) provided on the 4A-group lens barrel 122, and guides and holds the 4A-group lens barrel 122 so as to be movable in the optical axis direction. The rotation restricting portion 122d (first restricting portion) of the 4A-group lens barrel 122 abuts against the guide member 123b to prevent the 4A-group lens barrel 122 from rotating around the guide member 123a. Further, the rack spring 132 biases the 4A-group lens barrel 122 and the linear vibration wave motor 128, and biases the 4A-group lens barrel 122 and the guide member 123a.

[0025] Next, the shape of the 4A-group lens barrel 122 will be described. The 4A-group lens barrel 122 includes a linear guide portion 122G that abuts against the guide member 123a and is guided along the guide member 123a that serves as a first axis parallel to the optical axis X, and a rotation restricting portion 122d that abuts against the guide member 123b. As shown in FIGS. 3, 4, and 5, the linear guide portion 122G has a notch portion 122e instead of being cylindrical.

[0026] Also, as described above, the rack 131 is constantly biased in the direction indicated by the arrow Y1 in FIG. 3 by the rack spring 132, and the linear vibration wave motor 128 is held by the 3-group base lens barrel 120. Therefore, as shown in FIG. 4, the 4A-group lens barrel 122 receives a first force F1 exerted by the rack spring 132 on the 4A-group lens barrel 122, which is parallel to the normal direction of the contact surface between the rack 131 and the linear vibration wave motor 128. Further, the 4A-group lens barrel 122 receives a second force F2 received by the rotation restricting portion 122d from the guide member 123b, which is parallel to the normal direction of the contact surface between the guide member 123b and the rotation restricting portion 122d. Due to the resultant force F3 of these forces, the linear guide portion 122G is biased against the guide member 123a.

[0027] A sliding surface 122j (a sliding face) is formed on the linear guide 122G that slides with respect to the guide member 123a. The sliding surface 122j exists within a range of ±90 degrees ( +90 degrees in the clockwise direction and -90 degrees in the counterclockwise direction) centered on the guide member 123a from the intersection point B between the straight line L drawn from the center of the guide member 123a in the direction opposite to the resultant force F3 and the outer peripheral surface of the guide member 123a. And a notch portion 122e is formed in the linear guide 122G in a range that does not include the sliding surface 122j of the linear guide 122G when viewed in the optical axis direction. According to this configuration, even if the direction of gravity acting due to a change in the posture of the imaging system 30 changes, it is possible to stably bias the 4A group lens barrel 122 against the guide member 123a.

[0028] FIG. 6(A) is a front view of the arrangement of the 4A group lens barrel 122 and the 5 group lens barrel 127 as viewed from the imaging surface side, and FIG. 6(B) is a side view of the same arrangement. As shown in FIG. 6(A), the 4A group lens barrel 122 and the 5 group lens barrel 127 overlap in the optical axis direction. However, due to the provision of the notch portion 122e in the linear guide 122G, a part of the guide member 123a or a part of the 5 group lens barrel 127 can exist in the notch portion 122e when viewed in the optical axis direction. Further, as shown in FIG. 6(B), the guide member 123a or the 5 group lens barrel 127 can be arranged so as to overlap the linear guide 122G when viewed in the direction orthogonal to the optical axis. And other members such as the 5 group lens barrel 127 can be arranged without escaping in the radial direction and the optical axis direction from the notch portion 122e, and miniaturization is possible. According to the present embodiment having the above configuration, it is possible to provide an optical device that realizes miniaturization while performing stable biasing in various postures.

[0029] FIG. 7 is a front view seen from the imaging surface side of a configuration in which the 4A-group lens barrel 122 is assembled to the 3-group base lens barrel 120. As shown in FIG. 7, the 4A-group lens barrel 122 further has a rotation restricting portion 122f (third restricting portion), and the rotation restricting portion 122f restricts the rotation of the 4A-group lens barrel 122 in a direction away from the guide member 123b by the rotation restricting surface 120a of the 3-group base lens barrel 120. Alternatively, the rotation restricting portion 122f abuts against the 3-group base lens barrel 120 to which the guide member 123b is fixed to lock the rotation. Therefore, even when the lens barrel 10 receives an external force such as an impact force, the 4A-group lens barrel 122 can be held without being greatly separated from the guide member 123b by the rotation restricting portion 122d.

[0030] (Modification 1) FIG. 8 is an enlarged view of a modification 1 of the straight guide portion 122G in the first embodiment, showing the straight guide portion 122G. In this embodiment, the engaging portions 122h and 122i of the straight guide portion 122G have an arc shape, but as in the modification 1, it may have a shape having sliding surfaces 122k (first sliding surface) and 122m (second sliding surface) including a straight line when viewed from the optical axis direction. Further, the straight guide portion 122G abuts against the guide member 123a at a contact point K (first contact point) and a contact point M (second contact point) when viewed in the optical axis direction, and the sliding surface 122k including the contact point K and the sliding surface 122m including the contact point M intersect at their respective extension lines in a plane orthogonal to the optical axis.

[0031] At this time, the sliding surface 122k and the contact point K are located closer to the linear vibration wave motor 128 than the contact point M. The sliding surfaces 122k and 122m of the linear guide 122G exist within a range of ±90 degrees centered on the guide member 123a from the intersection point B between the straight line L drawn from the center of the guide member 123a in the direction opposite to the resultant force F3 and the outer peripheral surface of the guide member 123a. That is, the sliding surface 122k and the contact point K exist within a range between -90 degrees ( -90 degrees in the counterclockwise direction) from the intersection point B around the center of the guide member 123a in the direction approaching the linear vibration wave motor 128. Or, the sliding surface 122m and the contact point M exist within a range between +90 degrees ( +90 degrees in the clockwise direction) from the intersection point B around the center of the guide member 123a in the direction away from the linear vibration wave motor 128. With this configuration, even when there are dimensional differences between the guide member 123a and the engaging portions 122h and 122i, the guide member 123a can always contact the engaging portions 122h and 122i at the same two points as viewed from the optical axis direction, regardless of the change in the gravitational direction due to the change in posture.

[0032] (Modification 2) FIG. 9 is a front view as seen from the imaging surface side showing Modification 2 of the rotation restricting portion 122f of the 4A group lens barrel 122 in the first embodiment. In this embodiment, the rotation restricting portion 122f is formed to contact the 3 - group base lens barrel 120 to restrict rotation, but as in Modification 2, the rotation restricting portion 122f may contact the guide member 123b to lock the rotation. It is possible to restrict rotation with less space than in the case where the rotation restricting portion 122f is provided to restrict rotation with respect to the 3 - group base lens barrel 120.

[0033] (Modification 3) FIG. 10 is a perspective view showing Modification 3 of the driving means of the 4A group lens barrel 122 in the first embodiment. In this embodiment, a linear vibration wave motor 128 is employed to drive the 4A group lens barrel 122, but the same effect can be achieved by adopting driving means such as a step motor 130 as in Modification 3.

[0034] (Modification 4) FIG. 11 is a front view seen from the imaging surface side showing Modification 4 of the guide member 123a in Embodiment 1. In this embodiment, a rod-shaped member is adopted as the guide member 123a. However, as in Modification 4, the guide member 123a may be integrally formed with the three-group base lens barrel 120. FIG. 12 is an enlarged view of the range A of the broken line shown in FIG. 11, and the description of the guide member 123a integrally formed with the three-group base lens barrel 120 is omitted for easy understanding. The contact surface 122j between the straight-ahead guide portion 122G and the guide member 123a exists within a range of ±90 degrees about the center of the guide member 123a from the intersection point B, and a notch portion 122e is formed in the straight-ahead guide portion 122G in a range other than the contact surface 122j so as not to interfere with the three-group base lens barrel 120. With this configuration, cost reduction can be achieved by reducing the number of components and the number of assembly steps.

[0035] (Embodiment 2) Hereinafter, the lens barrel 10 according to Embodiment 2 of the present invention will be described. FIG. 13 is a cross-sectional view showing the configuration of the lens barrel 10 in Embodiment 2. In Embodiment 1, one 4A-group lens L4A was used as the lens for focus adjustment, but in this embodiment, two lenses for focus adjustment, namely, the 4A-group lens L4A and the 4B-group lens L4B (the second moving lens group), are used. For the same configurations in Embodiment 2 as in Embodiment 1, the same reference numerals are given, and the description thereof is omitted.

[0036] FIG. 14 is an exploded perspective view of the 4A-group lens barrel 122 and the 4B-group lens barrel 222 (the second holding member) and the peripheral members. The 4B-group lens L4B is held by the 4B-group lens barrel 222, and the 4B-group lens barrel 222 is held by a guide member 123b so as to be movable in the optical axis direction with respect to a three-group base lens barrel 120 (not shown). The 4B-group lens L4B is a lens for focus adjustment, similar to the 4A-group lens L4A, and the 4B-group lens barrel 222 holding the 4B-group lens L4B is driven in the optical axis direction by a linear vibration wave motor 228 (the second driving unit) held by the three-group base lens barrel 120. Since the configuration of the linear vibration wave motor 228 is the same as that of the linear vibration wave motor 128 described in Embodiment 1, the description thereof is omitted.

[0037] Fig. 15(A) is a front view of the configuration in which a peripheral member is assembled to the 4A group lens barrel 122 and the 4B group lens barrel 222, as seen from the imaging surface side, and Fig. 15(B) is a front view as seen from the subject side. Further, Fig. 16 is an enlarged view of the range C of the broken line shown in Fig. 15(B).

[0038] The 4B group lens barrel 222 has a rack 231 (second connecting member) and a rack spring 232 (second biasing member), and similar to the 4A group lens barrel 122 of the first embodiment, the driving force of the linear vibration wave motor 228 is transmitted to the 4B group lens barrel 222.

[0039] The guide member 123a engages with the arc-shaped engaging portions 122h and 122i of the linear guide portion 122G provided on the 4A group lens barrel 122, and holds the 4A group lens barrel 122 movably in the optical axis direction. At the same time, a rotation restricting portion 222d (second restricting portion) provided on the 4B group lens barrel 222 is in contact with the guide member 123a. A rotation restricting portion 122d is in contact with the guide member 123b, and at the same time, the arc-shaped engaging portions 222h and 222i of the linear guide portion 222G (second linear guide portion) provided on the 4B group lens barrel 222 are engaged, and the 4B group lens barrel 222 is guided and held movably in the optical axis direction. The rotation restricting portion 222d of the 4B group lens barrel 222 prevents the 4B group lens barrel 222 from rotating around the guide member 123a by contacting the guide member 123a. Further, the rack spring 232 biases the 4B group lens barrel 222 and the linear vibration wave motor 228, and biases the 4B group lens barrel 222 and the guide member 123b.

[0040] The shaft portion 231a of the rack 231 exists in the region where the shaft portion 131a of the rack 131 is located, among the regions divided by the line connecting the centers of the guide member 123a and the guide member 123b as seen from the optical axis direction (section line E-E in Fig. 15(A)). Further, the rack spring 232 biases so that the contact point between the rotation restricting portion 222d and the guide member 123a exists in the same region as the shaft portion 231a.

[0041] Next, the shape of the 4B group lens barrel 222 will be described. The 4B group lens barrel 222 includes a linear guide portion 222G that abuts against the guide member 123b and is guided along the guide member 123b, which serves as a second axis parallel to the optical axis X, and a rotation restricting portion 222d that abuts against the guide member 123a. As shown in FIG. 15(B), the linear guide portion 222G has a notch portion 222e and is not cylindrical like the linear guide portion 122G.

[0042] The rack 231 is constantly biased in the direction indicated by the arrow Y2 shown in FIG. 15(A) by the rack spring 232, and the linear vibration wave motor 228 is held by the 3-group base lens barrel 120. Therefore, as shown in FIG. 15(A), the 4B group lens barrel 222 receives a fourth force F4 parallel to the normal direction of the contact surface between the rack 231 and the linear vibration wave motor 228. Further, the 4B group lens barrel 222 receives a fifth force F5 parallel to the normal direction of the contact surface between the guide member 123a and the rotation restricting portion 222d. Due to the resultant force F6 of these forces, the linear guide portion 222G is biased against the guide member 123b.

[0043] A contact surface 222j (sliding surface) is formed on the linear guide portion 222G that slides against the guide member 123b. The contact surface 222j exists within a range of ±90 degrees ( + 90 degrees in the clockwise direction and - 90 degrees in the counterclockwise direction) centered on the guide member 123b from the intersection point D between the straight line L drawn from the center of the guide member 123b in the direction opposite to the reaction force of the resultant force F6 and the outer peripheral surface of the guide member 123b. The notch portion 222e is formed in the linear guide portion 222G in a range that does not include the contact surface 222j of the linear guide portion 222G when viewed in the optical axis direction. According to this configuration, even if the direction of gravity acting due to a change in the posture of the imaging system 30 changes, the 4B group lens barrel 222 can be stably biased against the guide member 123b.

[0044] The notch portion 222e is formed so that the rotation restricting portion 122d of the 4A group lens barrel 122 can fit when viewed from the optical axis direction. Further, the rotation restricting portion 222d is formed so that it can fit into the notch portion 122e of the 4A group lens barrel 122.

[0045] FIG. 17 is a front view as seen from the imaging surface side of a configuration in which the 4A group lens barrel 122 and the 4B group lens barrel 222 are assembled to the 3-group base lens barrel 120. As shown in FIG. 17, the 4B group lens barrel 222 further has a rotation restricting portion 222f, and the rotation restricting portion 222f restricts the rotation of the 4B group lens barrel 222 in a direction away from the guide member 123a by the rotation restricting surface 120b of the 3-group base lens barrel 120. Therefore, even when the lens barrel 10 receives an external force such as an impact force, the 4B group lens barrel 222 can be held without the rotation restricting portion 222d being greatly separated from the guide member 123a.

[0046] FIG. 18(A) is a cross-sectional view taken along the section line E-E shown in FIG. 15(A) when the distance in the optical axis direction between the 4A group lens barrel 122 and the 4B group lens barrel 222 is maximum. FIG. 18(B) is a cross-sectional view when the distance is minimum. These cross-sectional views show the cross-sections obtained by cutting the 4A group lens barrel 122, the 4B group lens barrel 222, the guide member 123a, and the guide member 123b with a line (E-E) connecting the centers of the guide member 123a and the guide member 123b.

[0047] As shown in FIG. 18(B), when at least the 4A group lens barrel 122 and the 4B group lens barrel 222 are close to each other in the optical axis direction, the rotation restricting portion 222d overlaps with a surface orthogonal to the axes of the straight-ahead guiding portion 122G and the guide member 123a. And by configuring the 4A group lens barrel 122 and the 4B group lens barrel 222 as in this embodiment, it becomes possible to arrange these members so that the 4A group lens barrel 122 and the 4B group lens barrel 222 overlap when viewed from a direction orthogonal to the optical axis.

[0048] With this configuration, since the 4A group lens barrel 122 and the 4B group lens barrel 222 are held by the same guide members 123a and 123b, it is possible to achieve both a radially small configuration and a reduction in the overall length of the apparatus, and it becomes possible to miniaturize the lens barrel 10.

[0049] (Modification 5) FIG. 19 is an enlarged view of the linear guide part 222G showing Modification 5 of the linear guide part 222G in Embodiment 2. In this embodiment, the engaging parts 222h and 222i of the linear guide part 222G have an arc shape, but may have a shape having sliding surfaces 222k (third sliding surface) and 222m (fourth sliding surface) including a straight line when viewed from the optical axis direction as in Modification 5. Further, the linear guide part 222G abuts on the guide member 123b at the contact point K (third contact point) and the contact point M (fourth contact point) when viewed in the optical axis direction, and the sliding surface 222k including the contact point K and the sliding surface 222m including the contact point M have their respective extension lines intersecting in the plane orthogonal to the optical axis.

[0050] At this time, the sliding surface 222k and the contact point K are present closer to the linear vibration wave motor 228 than the contact point M. And the sliding surfaces 222k and 222m of the linear guide part 222G exist in a range of ±90 degrees about the guide member 123b from the intersection point D between the straight line L drawn from the center of the guide member 123b in the reaction force direction of the resultant force F6 and the outer peripheral surface of the guide member 123b. That is, the sliding surface 222k and the contact point K exist between -90 degrees ( -90 degrees in the counterclockwise direction) in the direction approaching the linear vibration wave motor 228 about the center of the guide member 123b from the intersection point D. Or, the sliding surface 222m and the contact point M exist between +90 degrees ( +90 degrees in the clockwise direction) in the direction separating from the linear vibration wave motor 228 about the center of the guide member 123b from the intersection point D. With this configuration, even when there is a difference in the dimensions of the guide member 123b and the engaging parts 222h and 222i, the guide member 123b and the engaging parts 222h and 222i can always abut at the same two points when viewed from the optical axis direction regardless of the change in the gravitational direction due to the change in posture.

[0051] In this embodiment, the rotation restricting part 122f is provided so as to abut on the three - group base lens barrel 120 to restrict rotation, but it may be configured to abut on the guide member 123b to restrict rotation. Also, although the rotation restricting part 222f is provided so as to abut on the three - group base lens barrel 120 to restrict rotation, it may be configured to abut on the guide member 123a to restrict rotation.

[0052] (Modification 6) FIG. 20 is a perspective view showing a modification 6 of the driving means of the 4A group lens barrel 122 in the second embodiment. In the present embodiment, a linear vibration wave motor is adopted to drive the 4A group lens barrel 122 and the 4B group lens barrel 222. However, the same effect can be achieved by adopting a driving means such as a step motor 130 on one side as in the modification 6. Needless to say, step motors or the like may be adopted for both driving means.

[0053] As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist thereof.

[0054] The disclosure of the present embodiment includes the following configurations. (Configuration 1) A first holding member that holds a moving lens group, A first guiding member and a second guiding member that guide the first holding member in the optical axis direction, A first driving unit that drives the first holding member in the optical axis direction, A first connecting member that transmits the driving force of the first driving unit to the first holding member, An optical device having a first biasing member that biases the first holding member and the first driving unit and biases the first holding member and the first guiding member, The first holding member includes a first linear guiding portion that abuts against the first guiding member and is guided along a first axis parallel to the optical axis, and a first restricting portion that abuts against the second guiding member, The sliding surface of the first linear guiding portion that slides with respect to the first guiding member is in the range of ±90 degrees centered on the first axis from the intersection of a straight line drawn from the center of the first axis in the direction opposite to the resultant force of the first force exerted by the first biasing member on the first holding member and the second force received by the first restricting portion from the second guiding member and the outer peripheral surface of the first guiding member, The first linear guiding portion has a notch portion in a range that does not include the sliding surface when viewed in the optical axis direction, A part of the first guiding member or another member is present in the notch portion when viewed in the optical axis direction, The optical device is characterized in that the first guiding member or the other member is arranged so as to overlap with the first linear guide portion when viewed in a direction orthogonal to the optical axis. (Configuration 2) The first linear guide portion abuts on the first guiding member at a first contact point and a second contact point when viewed in the optical axis direction, the first sliding surface of the first linear guide portion including the first contact point and the second sliding surface of the first linear guide portion including the second contact point intersect with each other in an extension line in an optical axis orthogonal plane, the first contact point is closer to the first driving portion than the second contact point and exists within 90 degrees in a direction approaching the first driving portion with the center of the first guiding member as an axis from the intersection point, or the optical device according to Configuration 1, characterized in that the second contact point exists within 90 degrees in a direction separating from the first driving portion with the center of the first guiding member as an axis from the intersection point. (Configuration 3) a second holding member that holds a second moving lens group, a second driving portion that drives the second holding member in the optical axis direction, and a second connecting member that transmits the driving force of the second driving portion to the second holding member, the second holding member includes a second linear guide portion guided in the optical axis direction and a second restricting portion that abuts on the first guiding member, the optical device according to Configuration 1 or 2, characterized in that when at least the first holding member and the second holding member are close to each other in the optical axis direction, the second restricting portion overlaps with the first linear guide portion in a plane orthogonal to the first axis. (Configuration 4) a second biasing member that biases the second holding member and the second driving portion and biases the second holding member and the second guiding member, the second linear guide portion abuts on the second guiding member at a third contact point and a fourth contact point when viewed in the optical axis direction, The third sliding surface of the second straight guide portion including the third contact point and the fourth sliding surface of the second straight guide portion including the fourth contact point are configured such that the extension lines thereof intersect in a plane perpendicular to the optical axis, as described in Configuration 3 of the optical device. (Configuration 5) The optical device according to any one of Configurations 1 to 4, wherein the first restricting portion prevents the first holding member from rotating around the first guiding member by contacting the second guiding member. (Configuration 6) The optical device according to Configuration 3 or 4, wherein the second restricting portion prevents the second holding member from rotating around the first guiding member by contacting the first guiding member. (Configuration 7) The optical device according to any one of Configurations 1 to 6, wherein the first holding member is provided with a third restricting portion that restricts the first holding member from separating from the second guiding member. (Configuration 8) The optical device according to Configuration 7, wherein the third restricting portion locks the rotation by a cylindrical member that fixes the second guiding member. (Configuration 9) The optical device according to Configuration 7 or 8, wherein the third restricting portion locks the rotation by the second guiding member. (Configuration 10) An imaging system comprising the optical device according to any one of Configurations 1 to 9 and an imaging element that captures an image formed by the optical device.

Explanation of Reference Numerals

[0055] 30 Imaging system 10 Lens barrel (optical device) 20 Camera 20a Imaging element 120 Three-group base barrel (cylindrical member) 122 Group 4A barrel (first holding member) 122d Rotation restricting portion (first restricting portion) 122e Notch portion 122f Rotation restricting part (third restricting part) 122G Straight - advancing guiding part (first straight - advancing guiding part) 122j Contact surface (sliding surface) 122k Sliding surface (first sliding surface) 122m Sliding surface (second sliding surface) 123a Guide member (first guiding member) 123b Guide member (second guiding member) 127 5 - group lens barrel (other member) 128 Linear vibration wave motor (first driving part) 131 Rack (first connecting member) 132 Rack spring (first biasing member) 222 4B - group lens barrel (second holding member) 222d Rotation restricting part (second restricting part) 222e Notch part 222G Straight - advancing guiding part (second straight - advancing guiding part) 222k Sliding surface (third sliding surface) 222m Sliding surface (fourth sliding surface) 228 Linear vibration wave motor (second driving part) 231 Rack (second connecting member) 232 Rack spring (second biasing member) L4A 4A - group lens (first moving lens group) L4B 4B - group lens (second moving lens group) B, D Intersection point F1 First force F2 Second force F3 Resultant force K Contact point (first contact point, third contact point) L Straight line M Contact point (second contact point, fourth contact point) X Optical axis

Claims

1. a first holding member that holds a first moving lens group; a first guiding member and a second guiding member that guide the first holding member in the optical axis direction; a first driving unit that drives the first holding member in the optical axis direction; a first connecting member that transmits the driving force of the first driving unit to the first holding member; an optical device having a first biasing member that biases the first holding member and the first driving unit and biases the first holding member and the first guiding member, the first holding member includes a first linear guiding portion that abuts against the first guiding member and is guided along a first axis parallel to the optical axis, and a first restricting portion that abuts against the second guiding member; the sliding surface of the first linear guiding portion that slides with respect to the first guiding member is in a range of ±90 degrees centered on the first axis from the intersection of a straight line drawn from the center of the first axis in the direction opposite to the resultant force of the first force exerted by the first biasing member on the first holding member and the second force received by the first restricting portion from the second guiding member and the outer peripheral surface of the first guiding member, the first linear guiding portion has a notch portion in a range that does not include the sliding surface when viewed in the optical axis direction; a part of the first guiding member or another member is present in the notch portion when viewed in the optical axis direction; the optical device is characterized in that the first guiding member or the other member is arranged so as to overlap the first linear guiding portion when viewed in a plane perpendicular to the optical axis.

2. the first linear guiding portion abuts against the first guiding member at a first contact point and a second contact point when viewed in the optical axis direction; the first sliding surface of the first linear guiding portion including the first contact point and the second sliding surface of the first linear guiding portion including the second contact point intersect at their respective extension lines in a plane perpendicular to the optical axis; The first contact point is closer to the first driving part than the second contact point and exists within 90 degrees in the direction approaching the first driving part about the center of the first guiding member from the intersection point, or, the optical device according to claim 1, characterized in that the second contact point exists within 90 degrees in the direction away from the first driving part about the center of the first guiding member from the intersection point.

3. a second holding member that holds a second moving lens group; a second driving part that drives the second holding member in the optical axis direction; and further includes a second connecting member that transmits the driving force of the second driving part to the second holding member, the second holding member includes a second linear guide portion guided in the optical axis direction and a second restricting portion that abuts against the first guiding member, the optical device according to claim 1, characterized in that when at least the first holding member and the second holding member are close to each other in the optical axis direction, the second restricting portion overlaps with the first linear guide portion on a plane orthogonal to the first axis.

4. a second biasing member that biases the second holding member and the second driving part and biases the second holding member and the second guiding member; the second linear guide portion abuts against the second guiding member at a third contact point and a fourth contact point when viewed in the optical axis direction, the optical device according to claim 3, characterized in that extension lines of a third sliding surface of the second linear guide portion including the third contact point and a fourth sliding surface of the second linear guide portion including the fourth contact point intersect in an optical axis orthogonal plane.

5. the optical device according to claim 1, characterized in that the first restricting portion prevents the first holding member from rotating around the first guiding member by abutting against the second guiding member.

6. The optical device according to claim 3, wherein the second restricting portion prevents the second holding member from rotating around the first guiding member by contacting the first guiding member.

7. The optical device according to claim 1, wherein the first holding member is provided with a third restricting portion that restricts the first holding member from separating from the second guiding member.

8. The optical device according to claim 7, wherein the third restricting portion locks the rotation by a cylindrical member that fixes the second guiding member.

9. The optical device according to claim 7, wherein the third restricting portion locks the rotation by the second guiding member.

10. An imaging system, comprising: the optical device according to any one of claims 1 to 9; and an imaging element that captures an image formed by the optical device.

Images