Optical device and imaging apparatus

Abstract

To provide an optical element optical device that has a small-sized, light-weight optical element drive mechanism, and is advantageous for workability.SOLUTION: An optical element optical device has: a stationary barrel; a movable barrel that is arranged on an inner diameter side of the stationary barrel, holds an optical element, and is movable in an optical axis direction; a rotary barrel that is arranged on an outer diameter side of the stationary barrel, and is rotatable in a circumferential direction; and a regulation member that is in contact with one end in the optical axis direction of the rotary barrel to regulate the movement of the rotary barrel in the optical axis direction. The movable barrel includes a first cam follower that is engaged with a first groove provided in the rotary barrel, and a second cam follower that is engaged with a second groove provided in the stationary barrel. The second groove includes a first area that faces the rotary barrel in a radial direction, and a second area that faces the regulation member in the radial direction. The second area is provided with a through hole penetrating the stationary barrel in the radial direction. The second cam follower faces the regulation member with the through hole therebetween in the radial direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Conventionally, in a lens device that performs focusing and magnification by moving an optical element in the optical axis direction using a fixed barrel with a straight groove and a cam ring with cam grooves, a structure has been known in which multiple cam followers are arranged in the optical axis direction on the moving barrel to improve impact resistance and prevent the optical element from tipping over. Patent Document 1 discloses a lens device in which a cam ring having cam grooves is provided on the outer diameter of a fixed barrel having linear grooves, and multiple rollers that engage with the linear grooves are provided in a direction parallel to the optical axis. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-153618 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the prior art disclosed in Patent Document 1, the total length of the cam ring in the optical axis direction is sufficient to cover the length of the cam groove in the optical axis direction, but it extends toward the image plane to cover the range of the linear groove in order to seal the fixed barrel, which leads to an increase in the mass of the entire product. In addition, if the total length of the cam ring is shortened to the minimum required length, the linear groove portion is exposed, so the through hole needs to be blocked with a separate part such as an adhesive seal, but this increases the number of parts and the number of assembly steps. In addition, when attaching the seal member, care must be taken to avoid creating a gap with the through hole, and improvements in workability are required.

[0005] As described above, when trying to reduce the size and weight, the number of parts increases, and when trying to reduce the number of parts, the lens drive mechanism may become larger and heavier. SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an optical device that has a small, lightweight lens driving mechanism and is advantageous in terms of assembly workability. [Means for solving the problem]

[0006] In order to achieve the above object, the optical device comprises a fixed barrel, a movable barrel arranged on the inner diameter side of the fixed barrel and capable of moving in the optical axis direction while holding an optical element, a rotating barrel arranged on the outer diameter side of the fixed barrel and rotatable in a circumferential direction, and a regulating member that abuts against one end of the rotating barrel in the optical axis direction to regulate movement of the rotating barrel in the optical axis direction, the movable barrel having a first cam follower that engages with a first groove provided on the rotating barrel and a second cam follower that engages with a second groove provided on the fixed barrel, the second groove including a first region that faces the rotating barrel in the radial direction and a second region that faces the regulating member in the radial direction, the second region having a through hole that penetrates the fixed barrel in the radial direction, and the second cam follower that faces the regulating member in the radial direction via the through hole. Effect of the Invention

[0007] According to the present invention, it is possible to provide an optical device which has a small, lightweight lens driving mechanism and is advantageous in terms of assembly workability. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a front view of an optical device according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Diagram 3] FIG. 3 is a partially enlarged view of FIG. [Figure 4] FIG. 2 is a cross-sectional view taken along line BB in FIG. [Diagram 5] 1 during adjustment of the optical device according to the second embodiment. FIG. [Figure 6] FIG. 6 is a partially enlarged view of FIG. [Figure 7] FIG. 7 is a view taken along the arrow C in FIG. 6. [Figure 8] 3 is a cross-sectional view taken along the line AA in FIG. 2 during sealing of the optical device according to the second embodiment of the present invention. [Figure 9] FIG. 9 is a partially enlarged view of FIG. 8. [Figure 10] FIG. 10 is a view taken along the arrow D in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. EXAMPLES

[0010] A lens device (optical device) according to a first embodiment of the present invention will now be described with reference to FIGS. Fig. 1 is a front view of a lens device 1 according to Example 1 as viewed from the object side. Fig. 2 shows a cross-sectional view taken along line AA in Fig. 1. Fig. 3 shows a partially enlarged view of Fig. 2. Fig. 4 shows a cross-sectional view taken along line BB in Fig. 1. In Figs. 2 to 4, the left side is the object side and the right side is the image plane side.

[0011] The lens device 1 includes a first optical element 2, a second optical element 3, a third optical element 4, and a fourth optical element 5. The first optical element 2 is held between a first lens barrel 6 and a first pressing ring 7 fixed to the first lens barrel 6 from the object side by screwing or the like. The first lens barrel 6 is fixed to a first fixed barrel 8 with screws 9. The second optical element 3 is held between a second lens barrel 10 and a second pressing ring 11 fixed to the second lens barrel 10 from the object side by screwing or the like. The third optical element 4 is held between the second lens barrel 10 and a third pressing ring 12 fixed to the second lens barrel 10 from the object side by screwing or the like.

[0012] In this manner, the second lens barrel 10 holds the second optical element 3 and the third optical element 4. The third optical element 4 is disposed closer to the image surface side than the second optical element 3, and the outer diameter of the third optical element 4 is smaller than the outer diameter of the second optical element. The fourth optical element 5 is held between a third lens barrel (movable barrel) 13 that is movable in the optical axis direction, and a fourth pressing ring 14 that is screwed, for example, to the third lens barrel 13 from the image surface side. The fourth optical element 5 is disposed closer to the image surface side than the third optical element 4, and the outer diameter of the fourth optical element 5 is smaller than the outer diameter of the third optical element 4. The positions of the second optical element 3, the third optical element 4, and the fourth optical element 5 move in the optical axis direction (left and right direction in FIG. 2) relative to the first optical element 2, so that the focal distance and the focal length of the lens can be continuously changed.

[0013] Three first linear cam followers 15 extending in a direction perpendicular to the optical axis are fixed to the outer periphery of the second barrel 10 at equal intervals at 120 degrees from each other around the optical axis with screws 16. The three first linear cam followers 15 are engaged with three first linear grooves 8a extending in the optical axis direction provided in the first fixed barrel 8 in the same phase. Two first cam groove cam followers 17 extending in a direction perpendicular to the optical axis are fixed to the outer periphery of the second barrel 10 at 180 degrees from each other around the optical axis with screws 18. The two first cam groove cam followers 17 pass through first long holes 8b provided in the first fixed barrel 8 and engage with two first cam grooves 19a provided on the inner periphery of a rotary ring (rotary barrel) 19 that engages with the outer periphery of the first fixed barrel 8 so as to be rotatable and slidable around the optical axis.

[0014] Three second linear cam followers 20 extending in a direction perpendicular to the optical axis are fixed to the outer periphery 13a of the third barrel 13 at equal intervals at 120 degrees from each other around the optical axis. The three second linear cam followers 20 are engaged with three second linear grooves 8c extending in the optical axis direction provided in the first fixed barrel 8 in the same phase. Three third linear cam followers (second cam followers) 22 extending in a direction perpendicular to the optical axis are fixed to the outer periphery 13b of the third barrel 13 at equal intervals at 120 degrees from each other around the optical axis. The outer diameter of the second outer periphery 13b is smaller than the outer diameter of the first outer periphery 13a, and the second outer periphery 13b is provided closer to the image plane side than the first outer periphery 13a.

[0015] The third linear cam followers 22 are engaged with three third linear grooves (second grooves) 8d that are in phase with each other and extend in the optical axis direction and are provided penetrating the first fixed barrel 8 in the radial direction (perpendicular to the optical axis). The second linear cam followers 20 and the third linear cam followers 22 are in phase with each other, and the third linear cam followers 22 are disposed closer to the image plane side than the second linear cam followers 20.

[0016] Since the three second linear cam followers 20 and the three third linear cam followers 22 are provided on the third barrel 13 at different positions in the optical axis direction, linearity in the movement of the third barrel 13 in the optical axis direction relative to the first fixed barrel 8 is ensured.

[0017] Two second cam groove cam followers (first cam followers) 24 protruding in a direction perpendicular to the optical axis are fixed by screws 25 at 180 degrees from each other around the optical axis on the outer periphery of the second barrel 10. Each of the two second cam groove cam followers 24 passes through a second long hole (opening) 8e provided radially penetrating the first fixed barrel 8, and engages with two second cam grooves (first grooves) 19b provided on the inner periphery of the rotating ring 19. The second cam groove 19b is formed at a predetermined angle with respect to the optical axis direction, and the second cam groove cam followers 24 engaged with the second cam groove 19b slide to guide the optical element 5 to move in the optical axis direction.

[0018] The rotating ring 19 engages with the first fixed barrel 8 so as to be able to rotate smoothly relative to each other, and the rotating ring 19 is urged toward the image plane relative to the first fixed barrel 8 by a urging member 26, and movement in the optical axis direction is regulated by an annular rotating ring regulating member (regulating member) 27 fixed to the first fixed barrel 8. The first fixed barrel 8 is fixed to a connecting member 28 with a screw 29, and the connecting member 28 is connected to a second fixed barrel 30 with a screw 31. The operating ring 32 is fitted into the second fixed barrel 30 and can be rotated around the optical axis. The movement of the operating ring 32 in the optical axis direction is restricted by a restricting portion 30a of the second fixed barrel 30 and a restricting portion 28a of the connecting member 28.

[0019] An exterior ring 34 is provided on the outer diameter side of the rotating ring 19, which is fixed to the operation ring 32 and the first lens barrel 6 with screws (not shown). The operation ring 32 and the rotating ring 19 are connected with a connecting pin (not shown), and when the operation ring 32 is rotated, the rotating ring 19 also rotates in conjunction. When the rotating ring 19 rotates around the optical axis, the first cam groove cam follower 17 and the second cam groove cam follower 24 are guided by the first cam groove 19a and the second cam groove 19b, respectively, and the second lens barrel 10 and the third lens barrel 13 move along the optical axis.

[0020] Next, the rotation ring restricting member 27 and its surrounding structure will be described. The first rectilinear groove 8a, the second rectilinear groove 8c, and the third rectilinear groove 8d are holes penetrating the first fixed barrel 8 in a direction perpendicular to the optical axis. The first rectilinear groove 8a, the second rectilinear groove 8c, and a part (first region 8f) of the third rectilinear groove 8d face the rotating ring 19 arranged on the outer periphery side of them in a direction perpendicular to the optical axis, and the rotating ring 19 plays a role of sealing. That is, when viewed from the outside in the radial direction, the first rectilinear groove 8a, the second rectilinear groove 8c, and a part (first region 8f) of the third rectilinear groove 8d are covered by the rotating ring 19. Therefore, at least a part of the outer periphery surface of the first fixed barrel 8 and the inner periphery surface of the rotating ring 19 are in surface contact with each other, and the first rectilinear groove 8a, the second rectilinear groove 8c, and a part (first region 8f) of the third rectilinear groove 8d are sealed. It should be noted that the term "sealing" used in this specification is intended to prevent air, dust, moisture, etc. from entering or exiting between the inner diameter side and the outer diameter side of the first fixed barrel 8, but does not necessarily mean a complete airtight seal.

[0021] The female screw portion (optical axis direction fixed portion) 27a of the rotating ring regulating member 27 is screwed into and fixed to the male screw portion 8g provided on the outer periphery of the first fixed barrel 8. The rotating ring regulating member 27 extends in the optical axis direction, and the regulating portion (butting portion) 27b on the object side abuts against the stepped portion 8h on the first fixed barrel 8. As described above, the rotating ring 19 is urged toward the image surface by the urging member 26, and the sliding portion (sliding surface) 19c, which is the end face (one end) on one side of the rotating ring 19 in the optical axis direction, is always in abutment with the regulating portion 27b of the rotating ring regulating member 27, which abuts against the stepped portion 8h of the first fixed barrel 8.

[0022] As a result, a part of the third rectilinear grooves 8d (second region 8i) that cannot be sealed by the rotating ring 19 faces the rotating ring regulating member 27 in the direction perpendicular to the optical axis and is sealed. That is, the first rectilinear grooves 8a, the second rectilinear grooves 8c, and the third rectilinear grooves 8d are sealed by the rotating ring 19 and the rotating ring regulating member 27.

[0023] In the case of a structure in which the second region 8i is sealed with an adhesive seal or the like, the seal configuration and pasting work are added, but in the above-mentioned structure, the rotating ring regulating member 27 also serves the role of sealing the second region 8i, so the number of parts and assembly man-hours can be reduced. Also, by fixing the rotating ring regulating member 27 so that it abuts against the first fixed barrel 8, the through hole leading to the radial inside of the first fixed barrel 8 can be reliably sealed, and workability can be improved compared to pasting a seal.

[0024] As described above, in this embodiment, the through-holes (first rectilinear groove 8a, second rectilinear groove 8c, third rectilinear groove 8d) of the first fixed barrel 8 are sealed by the rotating ring 19 and the rotating ring regulating member 27. This shortens the length of the rotating ring 19 in the optical axis direction, thereby making it possible to reduce the size and weight of the rotating ring 19 and the operation ring 32, as well as reducing the number of parts required for sealing and the like, reducing the number of man-hours required for pasting, and improving the workability of sealing the through-holes.

[0025] Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications and changes are possible within the scope of the present invention. In this embodiment, the cam followers for the linear grooves provided on the second barrel 10 are three first linear cam followers 15, and the linear grooves into which the second linear cam follower 20 and the third linear cam follower 22 engage are the second linear groove 8c and the third linear groove 8d, respectively, but this is not limited to this. For example, a fourth linear cam follower that engages with the first linear groove 8a may be provided on the outer periphery of the second barrel 10, and the second linear groove 8c may be extended in the optical axis direction, so that the second linear cam follower 20 and the third linear cam follower 22 engage with each other. EXAMPLES

[0026] Second Embodiment Hereinafter, a lens barrel according to a second embodiment of the present invention will be described with reference to FIGS. Fig. 5 is a cross-sectional view taken along line AA in Fig. 1 during adjustment of the third lens barrel 13 in Example 2. Fig. 6 is a partially enlarged view of Fig. 5. The lens barrel according to Example 2 has the same basic configuration as the lens barrel according to Example 1, but differs in the following configuration and has a characteristic configuration.

[0027] The lens barrel according to the second embodiment differs from the lens barrel of the first embodiment shown in Fig. 2 in that it has a first fixed barrel 35 instead of the first fixed barrel 8, and has a rotating ring restricting member 36 instead of the rotating ring restricting member 27. The rotating ring restricting member 36 is fixed to the first fixed barrel 35 with screws (optical axis direction fixing portion, fixing member) 37. Three rectilinear grooves 35a extending in the optical axis direction provided in the first fixed barrel 35 engage with three first rectilinear cam followers 15 of the same phase. The rectilinear groove 35a has a top surface 35b and a first through hole 35c into which the first rectilinear cam follower 15 can be inserted.

[0028] The three second linear grooves 35d extending in the optical axis direction provided in the first fixed barrel 35 engage with the three second linear cam followers 20 that are in the same phase. The second linear groove 35d has a top surface 35e and a second through hole 35f into which the second linear cam followers 20 can be inserted from the outer diameter direction. The three third linear grooves 35g extending in the optical axis direction provided in the first fixed barrel 35 engage with the three third linear cam followers 22 that are in the same phase. The third linear groove 35g has a top surface 35h and a third through hole 35i into which the third linear cam followers 22 can be inserted from the outer diameter direction.

[0029] That is, the second linear groove 35d and the third linear groove 35g are grooves provided on the inner peripheral surface rather than grooves that penetrate the first fixed barrel 35 in the radial direction. The first fixed barrel 35 is provided with a second through hole 35f and a third through hole 35i into which the corresponding second linear cam follower 20 and third linear cam follower 22 can be inserted from the outer radial direction.

[0030] The fitting portion 36a of the rotating ring regulating member 36 fits into the fitting portion 35j of the first fixed barrel 35. The regulating portion 36b of the rotating ring regulating member 36 is fixed so as to abut against the stepped portion 35k of the first fixed barrel 35. The sliding portion (sliding surface) 19c of the rotating ring 19 always abuts against the regulating portion 36b of the rotating ring regulating member 36, and the movement of the rotating ring 19 in the optical axis direction is regulated.

[0031] FIG. 7 is a view taken along the arrow C in FIG. 6. The rotary ring regulating member 36 is provided with an elongated hole 36c in the circumferential direction around the optical axis. The rotary ring regulating member 36 is fixed to the first fixed barrel 35 with a screw 37 inserted into the elongated hole 36c. The rotary ring regulating member 36 can rotate with respect to the first fixed barrel 35 by the length of the elongated hole 36c by loosening the screw 37. The rotary ring regulating member 36 is also provided with three assembly adjustment holes (through holes) 36d at equal intervals of 120 degrees around the optical axis. The assembly adjustment holes 36d and the third through hole 35i of the rotary ring regulating member 36 face each other in a direction perpendicular to the optical axis. That is, the assembly adjustment hole 36d is configured at a position overlapping at least a part of the third through hole 35i in the optical axis direction, so that the assembly adjustment hole 36d overlaps with the third through hole 35i depending on the rotational position of the rotary ring regulating member 36 with respect to the first fixed barrel 35. Therefore, the third linear cam follower 22 is accessible.

[0032] FIG. 8 is a cross-sectional view of the state in which the rotary ring restricting member 36 is rotated 10 degrees with respect to the position of the first fixed barrel 35 shown in FIG. 5. FIG. 9 is a partially enlarged view of FIG. 8, and FIG. 10 is a view seen from the arrow D in FIG. 9. The third through hole 35i and the assembly adjustment hole 36d are offset from each other in the circumferential direction, and the third through hole 35i is sealed by the fitting portion 36a of the rotary ring restricting member 36 and the fitting portion 35j of the first fixed barrel 35. In this way, the sealing state of the third through hole 35i can be switched by rotating the rotary ring restricting member 36 around the optical axis, and by accessing the third linear cam follower 22 even after the rotary ring restricting member 36 is inserted, fine adjustment of the position where the third barrel 13 is fixed can be performed.

[0033] As described above, in this embodiment, the through-holes (first through-hole 35c, second through-hole 35f, third through-hole 35i) of the first fixed barrel 35 are sealed by the rotary ring 19 and the rotary ring regulating member 36. This shortens the length of the rotary ring 19 in the optical axis direction, making the rotary ring 19 and the operation ring 32 smaller and lighter, while reducing the number of parts such as adhesive stickers, reducing the number of steps for pasting, and improving the workability of sealing the through-holes. In addition, by rotating the rotary ring regulating member 36 around the optical axis to switch the sealing state of the third through-hole 35i, fine adjustment of the third barrel can be easily performed.

[0034] 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 present invention. In this embodiment, the second linear cam follower 20 and the third linear cam follower 22 are engaged with the second linear groove 35d and the third linear groove 35g, but the present invention is not limited to this. For example, the second linear groove 35d may be extended in the optical axis direction, and the second linear cam follower 20 and the third linear cam follower 22 may be engaged with each other.

[0035] A lens device having the lens barrel of the present invention can be provided that enjoys the effects of the present invention. Also, an imaging device having the lens device having the lens barrel of the present invention and an imaging device having an imaging element that receives an image formed by the lens device can be provided that enjoys the effects of the present invention.

[0036] The present disclosure includes the following configurations. (Configuration 1) A fixed cylinder; a movable barrel that is disposed on an inner diameter side of the fixed barrel and that is movable in an optical axis direction while holding an optical element; a rotating cylinder arranged on an outer diameter side of the fixed cylinder and rotatable in a circumferential direction; a restricting member configured to restrict movement of the rotating barrel in the optical axis direction by contacting one end of the rotating barrel in the optical axis direction, the movable barrel includes a first cam follower that engages with a first groove provided in the rotary barrel, and a second cam follower that engages with a second groove provided in the fixed barrel, the second groove includes a first region facing the rotary cylinder in a radial direction and a second region facing the regulating member in a radial direction, a through hole penetrating the fixed cylinder in a radial direction is provided in the second region, The optical device according to claim 1, wherein the second cam follower faces the regulating member in a radial direction via the through hole. (Configuration 2) the fixed barrel has a stepped portion having a surface perpendicular to the optical axis direction, 2. The optical device according to claim 1, wherein the regulating member has an abutting portion that abuts against the stepped portion. (Configuration 3) 3. The optical device according to configuration 2, wherein the regulating member has an optical axis direction fixing portion that fixes a position of the regulating member in the optical axis direction with respect to the fixed barrel. (Configuration 4) The optical device according to configuration 3, wherein the second region is provided between the abutting portion and the optical axis direction fixing portion in the optical axis direction. (Configuration 5) 5. The optical device according to any one of configurations 1 to 4, wherein the first groove is a cam groove formed at a predetermined angle with respect to the optical axis direction. (Configuration 6) 6. The optical device according to any one of configurations 1 to 5, wherein the second groove is a straight groove extending parallel to the optical axis direction. (Configuration 7) The optical device described in configuration 3 or 4, characterized in that the optical axis direction fixing portion is a female thread portion formed on the inner surface of the regulating member and screwed into a male thread portion formed on the outer surface of the fixed barrel. (Configuration 8) the rotating ring restricting member has a long hole penetrating in the radial direction and extending in the circumferential direction, and a through hole penetrating in the radial direction at a position at least partially overlapping with the second region in the optical axis direction, The optical device described in configuration 3 or 4, characterized in that the rotating ring regulating member can be fixed to the fixed barrel by a fixing member through the long hole, and can rotate in the circumferential direction within the range of the long hole. (Configuration 9) The optical device according to any one of configurations 1 to 8, characterized in that in the movable barrel, the outer diameter of a second outer periphery on which the second cam follower is provided is smaller than the outer diameter of a first outer periphery on which the first cam follower is provided. (Configuration 10) 10. An imaging device comprising: the optical device according to any one of configurations 1 to 9; and an imaging element that receives an image formed by the optical device. [Explanation of symbols]

[0037] 1: Lens device 8: First fixed tube (fixed tube) 8d: Third straight groove (second groove) 8f: 1st area 8i: Second area 13: Third telescope (moving tube) 19: Rotating Ring (Rotating Cylinder) 19b: Second cam groove (first groove) 22: 3rd linear cam follower (2nd cam follower) 24: Second cam groove cam follower (first cam follower) 27: Rotating ring control member (control member)

Claims

1. A fixed cylinder; a movable barrel that is disposed on an inner diameter side of the fixed barrel and that is movable in an optical axis direction while holding an optical element; a rotating cylinder arranged on an outer diameter side of the fixed cylinder and rotatable in a circumferential direction; a restricting member configured to restrict movement of the rotating barrel in the optical axis direction by contacting one end of the rotating barrel in the optical axis direction, the movable barrel includes a first cam follower that engages with a first groove provided in the rotary barrel, and a second cam follower that engages with a second groove provided in the fixed barrel, the second groove includes a first region facing the rotary cylinder in a radial direction and a second region facing the regulating member in the radial direction, a through hole penetrating the fixed cylinder in a radial direction is provided in the second region, The optical device according to claim 1, wherein the second cam follower faces the regulating member in a radial direction via the through hole.

2. the fixed barrel has a stepped portion having a surface perpendicular to the optical axis direction, The optical device according to claim 1 , wherein the regulating member has an abutting portion that abuts against the stepped portion.

3. The optical device according to claim 2 , wherein the regulating member has an optical axis direction fixing portion that fixes a position of the regulating member in the optical axis direction with respect to the fixed barrel.

4. The optical device according to claim 3 , wherein the second region is provided between the abutting portion and the optical axis direction fixing portion in the optical axis direction.

5. 2. The optical device according to claim 1, wherein the first groove is a cam groove formed at a predetermined angle with respect to the optical axis direction.

6. 2. The optical device according to claim 1, wherein the second groove is a rectilinear groove extending parallel to the optical axis direction.

7. 4. The optical device according to claim 3, wherein the optical axis direction fixing portion is a female thread portion formed on an inner peripheral surface of the regulating member and screwed into a male thread portion formed on an outer peripheral surface of the fixed barrel.

8. the rotating ring restricting member has a long hole penetrating in the radial direction and extending in the circumferential direction, and a through hole penetrating in the radial direction at a position at least partially overlapping with the second region in the optical axis direction, 4. The optical device according to claim 3, wherein the rotation ring regulating member can be fixed to the fixed barrel by a fixing member through the elongated hole, and can rotate in the circumferential direction within the range of the elongated hole.

9. 2. The optical device according to claim 1, wherein in the movable barrel, an outer diameter of a second outer periphery, on which the second cam follower is provided, is smaller than an outer diameter of a first outer periphery, on which the first cam follower is provided.

10. 10. An imaging apparatus comprising: the optical device according to claim 1; and an imaging element that receives an image formed by the optical device.

Images