Lens device

Abstract

To provide a lens device that prevents excessive force from being applied to a sliding surface when an operation ring is driven from the outside, regardless of whether a first gear section or a second gear section provided on the operation ring is used.SOLUTION: A lens device has a lens section 13, an operation ring 14 having a first gear section 18 and a second gear section 19 and operating the movement of the lens section 13, and a fixed member 15 fixed to a lens barrel 16 and supporting the movement of the lens section 13 in an optical axis direction D1. The fixed member 15 and the operation ring 14 move relative to each other while sliding against each other, and a sliding section 23 that slides is configured to slide on a convex section 24 formed on at least either the fixed member 15 or the operation ring 14.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a lens device. [Background technology]

[0002] Patent Document 1 describes a lens barrel including a fixed barrel having an optical element group and a first operating ring provided on the outer periphery of the fixed barrel and rotated in a rotational direction around the optical axis to operate the lens barrel, further including a second operating ring that rotates in conjunction with the first operating ring, and a friction member provided on the first operating ring that slides against the fixed barrel to generate a frictional force that acts as a resistance force when the first operating ring rotates, and the frictional force generated between the friction member and the fixed barrel is changed by changing the amount of deviation in the relative rotational direction between the first operating ring and the second operating ring.When an externally connected drive unit is used, it is possible to reduce the load during electric drive by the drive unit and reduce the operational load during manual operation.

[0003] Patent Document 2 describes an imaging device that takes pictures by switching the drive of an optical lens between manual drive and electric drive, and includes a rotating member that rotates when the optical lens is driven, a fixed member located outside the optical lens, a sliding torque generating member that contacts both the rotating member and the fixed member, and a switching mechanism that switches the drive transmission system in response to switching between manual drive and electric drive, where the switching mechanism switches between sliding on a first sliding surface between the sliding torque generating member and the rotating member without rotating the sliding torque generating member together with the rotating member, or sliding on a second sliding surface between the sliding torque generating member and the fixed member that has a different sliding torque from the first sliding surface. The operating torque loads for manual and electric drive are set separately, and the operating torque load for manual drive is set higher than that for electric drive.

[0004] Patent Document 3 describes a lens device that includes a movable optical element, an operation ring that is arranged on the outer periphery of the lens barrel and drives the movable optical element by rotating it about the optical axis, and an electric operation unit for electrically driving the operation ring, where the operation ring has multiple gears formed on the outer periphery around the optical axis and spaced apart in the optical axis direction, the multiple gears being configured on different members, the multiple gears always rotating together around the optical axis during operation, a gear of the electric operation unit engaging with one of the multiple gears, and the other gears of the multiple gears being positioned so as not to interfere with the electric operation unit in the optical axis direction. Even when an external rotation operation accessory is attached to a lens device equipped with an electric operation unit, the operability of the other operation rings is not impaired, and the lens device is capable of accommodating various rotation operation accessories with gear specifications different from those of the electric operation unit. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-77363 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-321479 [Patent Document 3] Patent No. 6204761 Summary of the Invention [Problem to be solved by the invention]

[0006] To provide a lens device in which, when an operation ring is driven from the outside, no excessive force is applied to a sliding surface regardless of whether a first gear part or a second gear part provided on the operation ring is used. [Means for solving the problem]

[0007] One aspect of the lens device related to the technology disclosed herein comprises a lens unit, an operating ring having a first gear unit and a second gear unit for operating the movement of the lens unit, and a fixed member fixed to the lens barrel and supporting the movement of the lens unit in the optical axis direction, the fixed member and the operating ring moving relative to each other while sliding against each other, and the sliding portion slides on a convex portion formed on at least either the fixed member or the operating ring.

[0008] Furthermore, the operating ring preferably has a first operating ring having a first gear portion, a second operating ring having a second gear portion, and a connecting member that connects the first operating ring and the second operating ring and converts rotation of the first operating ring and the second operating ring into movement in the optical axis direction of the lens portion, and the sliding portion preferably slides on a convex portion formed on at least either the fixed member or the connecting member.

[0009] Furthermore, it is preferable that the fixing member has a guide groove that restrains rotation of the lens unit in association with rotation of the operation ring and guides movement of the lens unit.

[0010] Furthermore, it is preferable that the sliding portion has a first sliding portion and a second sliding portion, and when viewed in a direction intersecting the optical axis of the lens portion, the first sliding portion is arranged in an area extending from a position opposite the first gear portion toward the subject side, and the second sliding portion is arranged in an area extending from a position opposite the second gear portion toward the imaging side.

[0011] Furthermore, it is preferable that the sliding portion has a first sliding portion and a second sliding portion, and that the first sliding portion and the second sliding portion are arranged so that a first reaction force at the first sliding portion and a second reaction force at the second sliding portion, which are generated when an external force is applied to at least either the first gear portion or the second gear portion, are in the same direction.

[0012] Furthermore, when viewed in a direction intersecting the optical axis of the lens unit, it is preferable that the first sliding portion is positioned closer to the subject than the first gear portion, and the second sliding portion is positioned to have an overlapping area with the second gear portion.

[0013] It is also preferable that the first module of the first gear portion and the second module of the second gear portion have different sizes.

[0014] Also, the first module is preferably larger than the second module.

[0015] Moreover, when viewed in a direction intersecting the optical axis, the first gear portion is preferably disposed inside the guide groove.

[0016] Furthermore, it is preferable that the first gear portion and the second gear portion are formed in the circumferential direction of the operating ring, the first gear portion having a larger diameter than the second gear portion, and the first sliding portion having a smaller width than the second sliding portion. [Effects of the Invention]

[0017] According to the present invention, when the operating ring is driven externally, no undue force is applied to the sliding surface regardless of whether the first gear portion or the second gear portion provided on the operating ring is used, and smooth movement is obtained. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a plan view of the lens device. [Figure 2] FIG. 2 is a perspective view of the lens device. [Figure 3] FIG. 3 is a cross-sectional view of the lens device taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view showing a state in which a fixing member is fixed to a lens barrel. [Figure 5] FIG. [Figure 6] FIG. 2 is a perspective view of a first lens unit. [Figure 7] FIG. 2 is a perspective view of a second lens unit. [Figure 8] FIG. 10 is a perspective view of a connecting member of the operating ring. [Figure 9] 10 is a perspective view of a state in which the first lens unit and the second lens unit are assembled to a connecting member of the operation ring. FIG. [Figure 10]FIG. 2 is a perspective view of a first operating ring of the operating ring. [Figure 11] FIG. 10 is a perspective view of a second operating ring of the operating ring. [Figure 12] FIG. 3 is a cross-sectional view showing a first cam follower portion and a second cam follower portion. [Figure 13] 10A and 10B are diagrams for explaining the positional relationship between a gear portion and a sliding portion. [Figure 14] 10A and 10B are diagrams for explaining the positional relationship between a gear portion and a sliding portion. [Figure 15] FIG. 4 is a cross-sectional view showing an angle restriction member. DETAILED DESCRIPTION OF THE INVENTION

[0019] (First embodiment) (Camera configuration) 1, a camera 10 includes a camera body 11 and an interchangeable lens device 12. The lens device 12 is detachably attached to a lens mount (not shown) on the front surface of the camera body 11.

[0020] (Lens device configuration) 2 and 3, the lens device 12 has a lens unit 13, an operation ring 14, and a fixed member 15. The lens unit 13 is disposed inside the fixed member 15, and the operation ring 14 is disposed outside the fixed member 15.

[0021] Fixed member 15 is fixed to lens barrel 16 and supports movement of lens unit 13 in the optical axis direction (direction of optical axis OA) D1. As shown in Fig. 4, fixed member 15 has a large-diameter cylindrical portion 15a, a small-diameter cylindrical portion 15b, and an inclined portion 15c connecting large-diameter cylindrical portion 15a and small-diameter cylindrical portion 15b, which are integrally formed. Small-diameter cylindrical portion 15b is fitted into the outer peripheral surface of lens barrel 16 and fixed therein by, for example, screws (not shown).

[0022] 5, the fixed member 15 has a guide groove 17. The guide groove 17 suppresses rotation of the lens unit 13 that accompanies rotation of a first operation ring 14A and a second operation ring 14B, which will be described later, and guides movement of the lens unit 13. The guide groove 17 is formed of an elongated hole that is aligned with the optical axis direction D1.

[0023] In this embodiment, the lens unit 13 includes a first lens unit 13A and a second lens unit 13B. The first lens unit 13A is disposed closer to the subject D2 side than the second lens unit 13B.

[0024] 6, first lens unit 13A has a cylindrical first lens holder 13Aa and a lens (not shown) held by first lens holder 13Aa. First lens unit 13A is housed inside large-diameter cylindrical portion 15a of fixed member 15 and is movable in optical axis direction D1 relative to fixed member 15. That is, first lens unit 13A is guided by guide groove 17 provided in fixed member 15 and is movable in optical axis direction D1. Here, the lens held by first lens unit 13A is a focus lens.

[0025] As shown in FIG. 7, the second lens unit 13B includes a second lens holder 13Ba and a lens (not shown) held by the second lens holder 13Ba. The second lens holder 13Ba includes a large-diameter cylindrical portion 13Bb, a small-diameter cylindrical portion 13Bc, and an inclined portion 13Bd connecting the large-diameter cylindrical portion 13Bb and the small-diameter cylindrical portion 13Bc, which are integrally formed. The large-diameter cylindrical portion 13Bb is accommodated inside the large-diameter cylindrical portion 15a of the fixed member 15 and is movable in the optical axis direction D1 relative to the fixed member 15. The small-diameter cylindrical portion 13Bc is disposed between the small-diameter cylindrical portion 15b of the fixed member 15 and the lens barrel 16 and is movable in the optical axis direction D1 relative to them. That is, the second lens unit 13B is guided by a guide groove 17 provided in the fixed member 15 and is movable in the optical axis direction D1. Here, the lens held by the second lens unit 13B is a focus lens.

[0026] The operation ring 14 operates the movement of the lens unit 13. In this embodiment, the operation ring 14 has a first operation ring 14A, a second operation ring 14B, and a connecting member 14C. However, instead of configuring the first operation ring 14A, the second operation ring 14B, and the connecting member 14C as separate members, the operation ring 14 may be configured by integrally forming these.

[0027] The connecting member 14C connects the first operating ring 14A and the second operating ring 14B and converts rotation of the first operating ring 14A and the second operating ring 14B into movement in the optical axis direction D1 of the lens unit 13. As shown in FIGS. 8 and 9, the connecting member 14C has a large-diameter cylindrical portion 14Ca, a small-diameter cylindrical portion 14Cb, and an inclined portion 14Cc connecting these, which are integrally formed. The large-diameter cylindrical portion 14Ca is arranged to cover the outer peripheral surface of the large-diameter cylindrical portion 15a of the fixed member 15. The small-diameter cylindrical portion 14Cb is arranged to cover the outer peripheral surface of the small-diameter cylindrical portion 15b of the fixed member 15.

[0028] As shown in Fig. 10, the first operation ring 14A has a first gear portion 18. The first operation ring 14A has a cylindrical shape. The first operation ring 14A is fitted onto the outside of the large-diameter cylindrical portion 14Ca of the connecting member 14C and is fixed by, for example, screws (not shown). The first gear portion 18 is provided around the entire circumferential surface of the first operation ring 14A.

[0029] 11, the second operation ring 14B has a second gear portion 19. The second operation ring 14B is fixed to the small diameter cylindrical portion 14Cb of the connecting member 14C. The second gear portion 19 is provided on the outer circumferential surface of the second operation ring 14B over the entire circumferential direction.

[0030] The first gear unit 18 is driven by, for example, a drive unit 25 (see FIG. 1) of an external accessory. The second gear unit 19 is driven by, for example, a drive unit 26 (see FIG. 1) of the camera 10. The second gear unit 19 has a smaller diameter than the first gear unit 18, thereby reducing the size of the camera 10 to which the drive unit 26 is attached. Meanwhile, since the first gear unit 18 has a predetermined size, it is possible to use a general-purpose drive unit 25 of an external accessory. Therefore, the first module of the first gear unit 18 and the second module of the second gear unit 19 are different in size. More specifically, the first module is set larger than the second module. By making the first module of the first gear unit 18 and the second module of the second gear unit 19 different in this way, the compatibility with a wider range of external accessories can be expanded. The second module is set smaller than the first module, thereby reducing the size of the digital camera 10 to which the drive unit 26 is attached. On the other hand, since the first module has a predetermined size, it is possible to use the drive unit 25, which is a general-purpose external accessory.

[0031] As shown in FIG. 8 , the operation ring 14 uses a cam mechanism to move the lens unit 13 in the optical axis direction D1. To this end, the operation ring 14 is provided with cam grooves 20 for controlling the movement of the lens unit 13. The cam grooves 20 are provided on the inner circumferential surface of the large-diameter cylindrical portion 14Ca of the connecting member 14C of the operation ring 14. In this embodiment, the lens unit 13 includes a first lens unit 13A and a second lens unit 13B, and therefore the cam grooves 20 include a first cam groove 20A for controlling the movement of the first lens unit 13A in the optical axis direction D1 and a second cam groove 20B for controlling the movement of the second lens unit 13B in the optical axis direction D1. The first cam groove 20A and the second cam groove 20B are provided in a spiral shape on the inner circumferential surface of the large-diameter cylindrical portion 14Ca.

[0032] First cam groove 20A is provided at a position facing guide groove 17 of fixed member 15 and facing first lens holder 13Aa of first lens unit 13. Corresponding to this first cam groove 20A, first lens holder 13Aa of first lens unit 13 is provided with a first cam follower portion 21. First cam follower portion 21 passes through guide groove 17 of fixed member 15 and is inserted into first cam groove 20A of operation ring 14.

[0033] 12, first cam follower portion 21 includes two cam followers 21A and 21B. First cam follower 21A faces fixed member 15 and is guided by guide groove 17 to move within guide groove 17, i.e., in optical axis direction D1. Second cam follower 21B is inserted into first cam groove 20A of operation ring 14 and is guided by first cam groove 20A to move within first cam groove 20A. That is, first cam follower portion 21 moves while being guided by spiral first cam groove 20A in conjunction with rotation of operation ring 14, but the movement of first cam follower portion 21 is suppressed or limited in optical axis direction D1 by guide groove 17, so ultimately, first cam follower portion 21 moves in optical axis direction D1 in conjunction with rotation of operation ring 14. Therefore, the first lens holder 13Aa provided with the first cam follower portion 21 also moves in the optical axis direction D1 as the operation ring 14 rotates.

[0034] Second cam groove 20B is provided at a position facing guide groove 17 of fixed member 15 and facing large-diameter cylindrical portion 13Bb of second lens holder 13Ba of second lens unit 13B. Corresponding to this second cam groove 20B, large-diameter cylindrical portion 13Bb of second lens holder 13Ba of second lens unit 13B is provided with a second cam follower portion 22. Second cam follower portion 22 passes through guide groove 17 of fixed member 15 and is inserted into second cam groove 20B of operation ring 14.

[0035] The second cam follower portion 22 includes two cam followers 22A and 22B. The first cam follower 22A faces the fixed member 15 and moves in the optical axis direction D1 while being guided by the guide groove 17. The second cam follower 22B is inserted into the second cam groove 20B of the operation ring 14 and moves within the second cam groove 20B while being guided by the second cam groove 20B. That is, the second cam follower portion 22 moves while being guided by the spiral cam groove 20 in accordance with the rotation of the operation ring 14, but the movement of the second cam follower portion 22 is suppressed or limited in the optical axis direction D1 by the guide groove 17, so that the second cam follower portion 22 ultimately moves in the optical axis direction D1 in accordance with the rotation of the operation ring 14. Therefore, the second lens holder 13Ba on which the second cam follower portion 22 is provided also moves in the optical axis direction D1 in accordance with the rotation of the operation ring 14.

[0036] 12, the first gear portion 18 is disposed inside the guide groove 17 (the range indicated by the symbol R1) when viewed in a direction D4 intersecting the optical axis OA. In other words, the first gear portion 18 is disposed in a region facing the guide groove 17. While the view D4 intersecting the optical axis OA is illustrated as being perpendicular to the optical axis OA in FIG. 12 and other figures, the view is not limited to a view perpendicular to the optical axis OA and includes any view intersecting the optical axis OA. The first cam follower portion 21 and the second cam follower portion 22 pass through the guide groove 17 and are therefore disposed inside the guide groove 17. Therefore, the first cam groove 20A into which the first cam follower portion 21 is inserted and the second cam groove 20B into which the second cam follower portion 22 is inserted are also disposed inside the guide groove 17. It is preferable that the members forming these two cam grooves 20A, 20B be thick-walled. On the other hand, first gear portion 18 is driven by drive unit 25, a general-purpose external accessory, and therefore needs to have a predetermined size. For this reason, it is relatively easy to increase the thickness of first operation ring 14A on which first gear portion 18 is provided and large-diameter cylindrical portion 14Ca of connecting member 14C into which first operation ring 14A is fitted to a certain extent. Therefore, by locating first gear portion 18 inside guide groove 17, it becomes advantageous in design to form cam grooves 20A, 20B in large-diameter cylindrical portion 14Ca of connecting member 14C, and design of lens device 12 becomes easier.

[0037] Furthermore, because the first operating ring 14A and the second operating ring 14B are connected by a connecting member 14C, the first operating ring 14A, the second operating ring 14B, and the connecting member 14C rotate together as the operating ring 14. The operating ring 14 is disposed on the outer periphery of the fixed member 15, and the operating ring 14 is rotatable relative to the fixed member 15. In other words, the fixed member 15 and the operating ring 14 are able to move relative to each other while sliding against each other (rotating in the direction indicated by arrow R5 in FIG. 2).

[0038] 4, a sliding portion 23 is provided on at least one of the fixed member 15 and the operation ring 14. In this embodiment, the sliding portion 23 is provided on the outer peripheral surface of the fixed member 15 along the entire circumferential direction. The sliding portion 23 has a first sliding portion 23A and a second sliding portion 23B. The first sliding portion 23A is provided on the first operation ring 14A side, and the second sliding portion 23B is provided on the second operation ring 14B side.

[0039] Each of the sliding portions 23A, 23B has a protrusion 24 formed along the entire circumference, and the protrusion 24 slides when the fixed member 15 and the operation ring 14 move (rotate) relative to each other while sliding against each other. In this embodiment, each of the sliding portions 23A, 23B has two or three rows of protrusions 24 aligned in the optical axis direction D1. However, the number of rows of the protrusions 24 is not limited to two or three and may be one row, four or more rows. The sliding portion 23 may be provided on the inner circumferential surface of the operation ring 14, or on both the outer circumferential surface of the fixed member 15 and the inner circumferential surface of the operation ring 14. When the sliding portion 23 is provided on the operation ring 14, it may be provided on the connecting member 14C, the first operation ring 14A, or the second operation ring 14B.

[0040] 13, specifically, the first sliding portion 23A is disposed in a region R2 on the first operation ring 14A side from a position facing the first gear unit 18 toward the subject side D2 when viewed in a direction D4 intersecting the optical axis OA of the lens unit 13. Furthermore, the second sliding portion 23B is disposed in a region R3 on the second operation ring 14B side from a position facing the second gear unit 19 toward the imaging side D3 when viewed in a direction D4 intersecting the optical axis OA of the lens unit 13.

[0041] By arranging the first sliding portion 23A and the second sliding portion 23B in this manner, the first reaction force F1 at the first sliding portion 23A and the second reaction force F2 at the second sliding portion 23B, which are generated when an external force is applied to at least one of the first gear portion 18 and the second gear portion 19, are in approximately the same direction. Here, "approximately the same direction" includes not only the case where the direction of the first reaction force F1 and the direction of the second reaction force F2 are the same, but also the case where the direction of the first reaction force F1 and the direction of the second reaction force F2 are different to the extent that the generation of a moment, which will be described later, can be suppressed to a level that does not have an adverse effect.

[0042] Specifically, the positional relationship between the gear portions 18 and 19 and the sliding portions 23A and 23B is as follows: When viewed in a direction D4 intersecting the optical axis OA of the lens portion 13, the first sliding portion 23A is located closer to the object side D2 than the first gear portion 18, or at a position where it overlaps at least partially with the first gear portion 18. When viewed in a direction D4 intersecting the optical axis OA of the lens portion 13, the second sliding portion 23B is located closer to the image side D3 than the second gear portion 19, or at a position where it overlaps at least partially with the second gear portion 19. In other words, as shown in FIG. 14 , all or part of the sliding portions 23A and 23B are located outside a region R4 between an end P1 on the image side D3 of the first gear portion 18 and an end P2 on the object side D2 of the second gear portion 19. In this embodiment, in the view direction D4 that intersects with the optical axis OA of the lens unit 13, the first sliding portion 23A is positioned closer to the subject D2 than the first gear unit 18, and the second sliding portion 23B is positioned so as to overlap with the second gear unit 19.

[0043] For example, the first sliding portion 23A can be arranged at the position shown by P3 in Fig. 14 (a position D2 closer to the object than the first gear portion 18, or a position that overlaps even partially with the first gear portion 18), but the position shown by P4 (a position that does not overlap at all with the first gear portion 18) is inappropriate. Also, the second sliding portion 23B can be arranged at the position shown by P5 in Fig. 14 (a position D3 closer to the image formation side than the second gear portion 19, or a position that overlaps even partially with the second gear portion 19), but the position shown by P6 (a position that does not overlap at all with the second gear portion 19) is inappropriate.

[0044] With this arrangement, an external force acting on the first gear portion 18 or the second gear portion 19 is transmitted directly to the first sliding portion 23A or the second sliding portion 23B, and a reaction force F1, F2 that is smaller than the external force acting on the first sliding portion 23A or the second sliding portion 23B and faces the same direction as the external force is generated on the first sliding portion 23A or the second sliding portion 23B. In other words, the fixed member 15 can directly receive the operation ring 14, and the generation of a moment on the fixed member 15 or the operation ring 14 can be suppressed. This makes it possible to prevent an excess force from being generated on the sliding portion 23, for example, a force greater than the external force acting on either the first sliding portion 23A or the second sliding portion 23B, and improves the operational feel when the user operates the operation ring 14.

[0045] In this embodiment, the first sliding portion 23A is disposed closer to the subject side D2 than the first gear portion 18 when viewed in a direction D4 intersecting the optical axis OA of the lens portion 13. The second sliding portion 23B is disposed to have an overlapping area with the second gear portion 19 when viewed in a direction D4 intersecting the optical axis OA of the lens portion 13. By disposing the first sliding portion 23A in this manner, it is possible to further improve the operational feel when the user operates the operation ring 14, as described above.

[0046] 4, in this embodiment, the width (length in the optical axis direction D1) of the first sliding portion 23A is smaller than that of the second sliding portion 23B. This allows the area of ​​the sliding surface of the first sliding portion 23A and the area of ​​the sliding surface of the second sliding portion 23B to be approximately the same. That is, the large-diameter cylindrical portion 15a of the fixed member 15 on which the first sliding portion 23A is provided has a larger diameter than the small-diameter cylindrical portion 15b of the fixed member 15 on which the second sliding portion 23B is provided, and the length of the first sliding portion 23A (the circumferential length of the large-diameter cylindrical portion 15a) is longer than the length of the second sliding portion 23B (the circumferential length of the small-diameter cylindrical portion 15b). Therefore, if the width W1 of the first sliding portion 23A and the width W2 of the second sliding portion 23B are made the same, the area of ​​the sliding surface of the first sliding portion 23A and the area of ​​the sliding surface of the second sliding portion 23B cannot be made the same (area = length × width). Therefore, the width W1 of the first sliding portion 23A is made smaller than the width W2 of the second sliding portion 23B, and the area of ​​the sliding surface of the first sliding portion 23A and the area of ​​the sliding surface of the second sliding portion 23B are made approximately equal.

[0047] When the operation ring 14 is operated, a rotational resistance force is generated as a friction force between the first sliding portion 23A and the second sliding portion 23B. By making the area of ​​the sliding surface of the first sliding portion 23A equal to the area of ​​the sliding surface of the second sliding portion 23B, it is possible to make the pressure acting on the first sliding portion 23A and the pressure acting on the second sliding portion 23B equal when the operation ring 14 is operated, thereby further improving the operational feel when the user operates the operation ring 14.

[0048] (Lens device operation) When first gear portion 18 is rotated by drive unit 25 of the external accessory, or when second gear portion 19 is rotated by drive unit 26, operation ring 14 rotates relative to fixed member 15. When operation ring 14 rotates, cam follower portions 21 and 22 move while being guided by spiral cam grooves 20A and 20B. Since cam follower portions 21 and 22 pass through guide groove 17 and are movable only in optical axis direction D1, cam follower portions 21 and 22 move in optical axis direction D1 as operation ring 14 rotates. Since first cam follower portion 21 is provided in first lens holder 13Aa of first lens portion 13A, and second cam follower portion 22 is provided in second lens holder 13Ba of second lens portion 13B, rotation of operation ring 14 moves first lens portion 13A and second lens portion 13B in the optical axis direction D1.

[0049] Since the operation ring 14 and the fixed member 15 slide on the convex portion 24 of the sliding portion 23, it is possible to prevent sliding at any position other than the sliding portion 23. Therefore, it is possible to slide the operation ring 14 and the fixed member 15 at a specific position that is aimed at in advance at the time of design, and it is possible to accurately control the sliding position, so to speak.

[0050] In the above embodiment, an example is given in which the lens unit 13 is moved in the optical axis direction D1 by a cam system, but the lens unit 13 may also be moved in the optical axis direction D1 by a so-called helicoid screw system. In this case, the lens device can be manufactured at a lower cost than with the cam system. Furthermore, other than the cam system or helicoid screw system, the lens unit 13 may also be moved in the optical axis direction D1 by a separate member (a cam component, a helicoid component, etc.) that rotates in conjunction with the operation ring 14.

[0051] An angle limiting member may be provided to limit the rotation range of the operation ring 14 relative to the fixed member 15. Specifically, as shown in FIG. 15 , the angle limiting member 27 includes an operation ring side member 27A and a fixed side member 27B. The operation ring side member 27A is fixedly disposed on the inner surface of the second operation ring 14B of the operation ring 14. The fixed side member 27B is fixedly disposed on the outer circumferential surface of the fixed member 15, positioned on the movement path of the second operation ring 14B. The angle limiting member 27 limits the rotation range of the operation ring 14 relative to the fixed member 15, thereby limiting the movement range of the lens unit 13 in the optical axis direction D1. Information such as the focal length may be written on the angle limiting member 27, for example, the operation ring side member 27A. This allows the rotation range of the operation ring 14 relative to the fixed member 15 to be seen at a glance. The angle limiting member may also be provided on a gear component that is linked to the rotation of the operation ring 14.

[0052] Also, the gear parts 18, 19 may be formed as separate members from the operation rings 14A, 14B, and the gear parts 18, 19 may be fixed to the operation rings 14A, 14B by fixing means such as screws, tape, adhesive, etc. This makes it possible to easily assemble the gear parts 18, 19 to the operation rings 14A, 14B.

[0053] The lens device according to the present invention can be applied to lens devices such as TV cameras and digital cameras. [Explanation of symbols]

[0054] 10 Camera 11 Camera body 12 Lens device 13 Lens section 13A First lens section 13Aa First lens holder 13B Second lens section 13Ba Second Lens Holder 13Bb Large diameter cylindrical section 13Bc Small diameter cylindrical part 13Bd Slope 14 Operation ring 14A First operating ring 14B Second operating ring 14C Connecting member 14Ca Large diameter cylindrical part 14Cb Small diameter cylindrical part 14Cc Slope 15 Fixing member 15a Large diameter cylindrical part 15b Small diameter cylindrical part 15c Slope 16 Lens barrel 17 Guide groove 18 First gear section 19 Second gear section 20 Cam groove 20A First cam groove 20B Second cam groove 21 First cam follower part 21A First cam follower 21B Second cam follower 22 Second cam follower part 22A First Cam Follower 22B Second cam follower 23 Sliding part 23A First sliding part 23B Second sliding part 24 Convex part 25 External accessory drive unit 26 Drive unit 27 Angle control member 27A Operating ring side member 27B Fixed side member

Claims

1. A lens part, an operation ring having a first gear portion and a second gear portion and configured to operate the movement of the lens portion; a fixing member fixed to the lens barrel and supporting movement of the lens unit in the optical axis direction; The fixed member and the operation ring move relative to each other while sliding against each other, The sliding portion slides on a convex portion formed on at least one of the fixed member and the operation ring. Lens device.

2. the operation ring includes a first operation ring having the first gear portion, a second operation ring having the second gear portion, and a connecting member that connects the first operation ring and the second operation ring and converts rotation of the first operation ring and the second operation ring into movement of the lens portion in the optical axis direction, The sliding portion slides on a convex portion formed on at least one of the fixing member and the connecting member.

2. The lens device according to claim 1.

3. the fixing member has a guide groove that suppresses rotation of the lens unit in association with rotation of the operation ring and guides movement of the lens unit.

3. The lens device according to claim 1.

4. the sliding portion has a first sliding portion and a second sliding portion, When viewed in a direction intersecting the optical axis of the lens portion, the first sliding portion is disposed in a region extending from a position facing the first gear portion toward a subject, the second sliding portion is disposed in a region extending from a position facing the second gear portion toward an imaging side; 2. The lens device according to claim 1.

5. the sliding portion has a first sliding portion and a second sliding portion, the first sliding portion and the second sliding portion are arranged so that a first reaction force at the first sliding portion and a second reaction force at the second sliding portion, which are generated when an external force is applied to at least one of the first gear portion and the second gear portion, are directed in the same direction.

2. The lens device according to claim 1.

6. When viewed in a direction intersecting the optical axis of the lens portion, the first sliding portion is disposed closer to the subject than the first gear portion, the second sliding portion is arranged to have an overlapping area with the second gear portion; 6. The lens device according to claim 4 or 5.

7. a first module of the first gear portion and a second module of the second gear portion having different sizes; The lens device according to claim 1 .

8. The first module is larger than the second module. The lens device according to claim 7 .

9. When viewed in a direction intersecting the optical axis, The first gear portion is disposed inside the guide groove. The lens device according to claim 3 .

10. the first gear portion and the second gear portion are formed in the circumferential direction of the operation ring, the first gear portion has a larger diameter than the second gear portion; The first sliding portion has a width smaller than that of the second sliding portion. The lens device according to claim 4 .

Images