Lens accessory and lens device

Abstract

To provide a lens accessory and a lens device which can secure an excellent appearance and a high strength at the same time.SOLUTION: A lens hood 1 attached to a replacement lens 50 includes: a rail part 10 engaged with a flange part 53 of the replacement lens 50; and a constraining mechanism for constraining both end parts of the flange part 53 of the replacement lens 50. The constraining mechanism includes a lever member 20 which can switch restriction and release of the flange part 53 by rotating. The lever member 20 is provided with an inclined surface part 26 in a surface of the replacement lens 50 which is located in a direction distant from an optical axis X. The lever member 20 has a fulcrum part 25 in the shape of a recess having a rotary shaft 21.SELECTED DRAWING: Figure 5

Description

[Technical field]

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

[0002] Patent Document 1 describes a hood attachment mechanism that includes: a plurality of bayonet protrusions provided at the tip of the lens barrel; a bayonet receiver portion that protrudes like a flange from the rear end of the hood and has notches formed at intervals circumferentially of the optical axis into which the bayonet protrusions fit; and an elastic member that has a biasing portion provided on the bayonet receiver portion that presses the bayonet protrusions in the optical axis direction and a stopper portion that positions the hood relative to the lens barrel by abutting against the circumferential ends of the bayonet protrusions.

[0003] Patent Document 2 describes a lens hood that has an inner peripheral protrusion that fits between the bayonet claws and flange portion of the lens barrel and can be attached and detached from the lens barrel by rotating it, and is composed of a locking lever that is sandwiched between a hood base and a hood cover, and a torsion spring that generates a biasing force between the hood cover and the locking lever, and the lens hood has a locking mechanism in which the tip of the locking lever abuts against the end of the bayonet claws of the lens barrel due to the biasing force of the torsion spring, restricting rotation around the optical axis and preventing rattling relative to the lens barrel.

[0004] Patent Document 3 describes an attachment device for a bayonet-type lens hood that is detachable from a lens, in which a notch is formed in part of a bayonet claw provided on the inner circumference of the lens hood, a circular piece of silicone rubber wider than the width of the bayonet claw is fixed to the notch, and the bayonet claw and the circular silicone rubber are fitted into a groove formed by the lens side claw formed on the outer circumference of the lens, thereby pressing the groove from the inside using the elasticity of the silicone rubber. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 08-082830 [Patent Document 2] JP 2016-109944 A [Patent Document 3] Japanese Utility Model Application Publication No. 06-055139 Summary of the Invention

[0006] One embodiment of the technique of the present disclosure provides a lens accessory and a lens device that can ensure strength while maintaining a good appearance. [Means for solving the problem]

[0007] (1) A lens accessory that is attached to a lens device, an engaging portion that engages with the engaged portion of the lens device; a restraining mechanism for restraining both ends of the engaged portion, the restraint mechanism includes a lever member that can be switched between the restraint and release states by rotation, the lever member has a first inclined surface formed on a surface facing away from the optical axis of the lens device, and the fulcrum of rotation is concave; Lens accessories.

[0008] (2) A lens accessory according to (1), the lever member is provided on a hood member having a second inclined surface portion on a surface facing away from the optical axis, The fulcrum portion of the lever member is provided at a position where at least a portion of the fulcrum portion overlaps with the second inclined surface portion when viewed in the direction of the rotation axis of the lever member. Lens accessories.

[0009] (3) A lens accessory according to (1) or (2), The first inclined surface portion has an inclined surface whose distance from the optical axis becomes shorter as it goes in a first direction along the optical axis. Lens accessories.

[0010] (4) A lens accessory according to (3), The concave shape is a concave shape in a direction along the optical axis. Lens accessories.

[0011] (5) A lens accessory according to (3), The concave shape is a concave shape when viewed from a direction intersecting the optical axis. Lens accessories.

[0012] (6) A lens accessory according to any one of (1) to (5), The engagement portion has a bayonet structure, one or more first biasing portions that bias the engaged portion in a radial direction of rotation of the bayonet structure in the engaged state; The direction of the resultant force of the one or more first biasing portions includes a radial direction of rotation of the bayonet structure. Lens accessories.

[0013] (7) A lens accessory according to (6), the lever member has a protrusion that engages with one end of the engaged portion in the restrained state, the direction of the resultant force is a direction in which one end of the engaged portion engages with the protruding portion in the restrained state; Lens accessories.

[0014] (8) A lens accessory according to (6) or (7), The one or more first biasing portions are a plurality of biasing portions. Lens accessories.

[0015] (9) A lens accessory according to any one of (1) to (8), the lever member has a depression portion, and is displaced from a first position to a second position by pressing the depression portion; the restraint mechanism has a second biasing portion that maintains the lever member at the first position in the engaged state, The second biasing portion is provided at a position where at least a portion of the second biasing portion overlaps with the push-down portion when viewed in a push-down direction of the push-down portion. Lens accessories.

[0016] (10) an engaging portion having a bayonet structure that engages with an engaged portion of the lens device; a restraining mechanism for restraining both ends of the engaged portion; and one or more biasing portions that bias the engaged portion in a radial direction of rotation of the bayonet structure in the engaged state, The direction of the resultant force of the one or more biasing portions is the radial direction of rotation of the bayonet structure. Lens accessories.

[0017] (11) An engaging portion that engages with an engaged portion of the lens accessory; a restraining mechanism for restraining both ends of the engaged portion, the restraint mechanism includes a lever member that can be switched between the restraint and release states by rotation, The lever member has a slope formed on a surface facing away from the optical axis, and the fulcrum of the rotation has a concave shape. Lens device.

[0018] (12) An engagement portion having a bayonet structure that engages with an engaged portion of the lens accessory; a restraining mechanism for restraining both ends of the engaged portion; and one or more biasing portions that bias the engaged portion in a radial direction of rotation of the bayonet structure in the engaged state, The direction of the resultant force of the one or more biasing portions is the radial direction of rotation of the bayonet structure. Lens device. Effect of the Invention

[0019] According to the present invention, it is possible to provide a lens accessory and a lens device that can ensure strength while maintaining a good appearance. [Brief description of the drawings]

[0020] [Figure 1] 1 is a perspective view showing an example of a lens accessory of the present embodiment. [Diagram 2] FIG. 1 is a perspective view showing an example of a lens device according to an embodiment of the present invention. [Diagram 3] 1 is a perspective view showing a lens hood 1 attached to an interchangeable lens 50. FIG. [Figure 4] 1 is a perspective view showing the lens hood 1 attached in reverse to the interchangeable lens 50. FIG. [Diagram 5] 2A to 2C are diagrams showing the configuration of a hood connection portion 3 of the lens hood 1. [Figure 6] 11 is a diagram showing an example of a biasing force applied to an interchangeable lens 50 from a hood connection part 3 when the lens is attached in the normal direction. [Figure 7] 1 is a diagram showing the hood connection part 3 of the lens hood 1 attached in a normal manner to the lens connection part 52 of the interchangeable lens 50. FIG. [Figure 8] 11 is a diagram showing an example of a biasing force applied to an interchangeable lens 50 from a hood connection part 3 in reverse attachment. [Figure 9] 1 is a diagram showing the hood connection part 3 of the lens hood 1 attached in reverse to the lens connection part 52 of the interchangeable lens 50. FIG. [Figure 10] 13 is a diagram showing an example of a biasing member 12a provided on a rail portion 10 of a hood connection portion 3. FIG. [Figure 11] 11 is a diagram showing an example of a mounting recess 131 to which a biasing member 12a is attached. FIG. [Figure 12] 2 is a perspective view showing an example of a lever member 20 as viewed from the side where a lever protrusion 23 is provided. FIG. [Figure 13] 2 is a perspective view showing an example of a lever member 20 as viewed from the side where a push button 22 is provided. FIG. [Figure 14]2 is a cross-sectional view of a push button 22 and a biasing spring 24 of a lever member 20 provided in a hood connection portion 3. FIG. [Figure 15] 4 is a cross-sectional view showing the position of a rotation shaft 21 of a lever member 20 provided on a hood connection portion 3. FIG. [Figure 16] 1 is a perspective view showing an example of an interchangeable lens 50 provided with a restraint mechanism. [Figure 17] 2 is a perspective view showing the configuration of a lens connection portion 52 in an interchangeable lens 50. FIG. [Figure 18] 18 is a plan view of the lens connection portion 52 shown in FIG. 17. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

[0022] <Lens accessories according to embodiments> Fig. 1 is a perspective view showing an example of a lens accessory of the present embodiment. As shown in Fig. 1, an example of a lens accessory is a lens hood 1 that can be attached to a lens device (described later in Fig. 2). The lens hood 1 is formed, for example, into a cylindrical shape as a whole. The lens hood 1 includes a hood main body 2 and a hood connection portion 3.

[0023] The hood body 2 is formed in a cylindrical shape. The hood connection part 3 is provided at one end of the hood body 2. The hood connection part 3 may be detachable from the hood body 2. The hood connection part 3 is formed in a cylindrical shape whose diameter gradually decreases with increasing distance from the hood body 2. The outer peripheral surface of the hood connection part 3 is provided with a slope part 3a whose diameter gradually decreases with increasing distance from the hood body 2. The hood connection part 3 can be attached to the hood body 2 using, for example, screws.

[0024] The lens hood 1 also includes a press button 22 that is operated when removing the lens hood 1 from the interchangeable lens. The lens hood 1 also includes a filter operation window 40 that is used when rotating a filter attached to the interchangeable lens.

[0025] <Lens device according to embodiment> Fig. 2 is a perspective view showing an example of a lens device of this embodiment. As shown in Fig. 2, an example of a lens device is an interchangeable lens 50 to which a lens hood 1 is attached. The interchangeable lens 50 includes a lens barrel 51 and a lens connection portion 52. Note that the lens member is not shown in the interchangeable lens 50 of this example. The lens member is provided inside the lens barrel 51 such that its optical axis X passes through the center of the lens barrel 51. The interchangeable lens 50 is attached interchangeably to an imaging device such as a camera.

[0026] Lens barrel 51 is formed in a cylindrical shape. Lens connection portion 52 is provided at one end of lens barrel 51 so as to be continuous with lens barrel 51. One end is the end opposite to the imaging device (imaging element) side to which interchangeable lens 50 is attached.

[0027] A flange portion 53 is formed on the outer peripheral surface of the lens connection portion 52. The flange portion 53 is formed so as to protrude radially outward from the outer peripheral surface of the lens connection portion 52 and extend in the circumferential direction. The flange portion 53 is a portion for attaching the lens hood 1. The flange portion 53 is formed, for example, in the shape of a single rail on the outer peripheral surface of the lens connection portion 52. The length of the flange portion 53 extending in the circumferential direction is a length that spans a predetermined section in the circumferential direction (corresponding to a predetermined central angle). The number of flange portions 53 may be one, or multiple, spaced apart at predetermined intervals in the circumferential direction. The flange portion 53 is an example of an "engaged portion" in the present invention.

[0028] <Attaching lens hood 1> Fig. 3 is a perspective view showing the lens hood 1 attached to an interchangeable lens 50. As shown in Fig. 3, the lens hood 1 is attached to one end of the interchangeable lens 50 (the side where the lens connection part 52 is provided). The lens hood 1 is configured so that it can be attached to the interchangeable lens 50 by engaging the hood connection part 3 of the lens hood 1 with the outer periphery of the lens connection part 52 of the interchangeable lens 50 and rotating the lens hood 1 in the circumferential direction.

[0029] The lens hood 1 is attached to the interchangeable lens 50 in a bayonet style. The lens hood 1 has an exterior shape in which the diameter of the hood body 2 is large and the diameter of the hood connection part 3 gradually decreases as it approaches the interchangeable lens 50. In the following description, the end of the lens hood 1 on the side where the hood connection part 3 is provided will be referred to as the "rear end" of the lens hood 1, and the end on the opposite side will be referred to as the "front end" of the lens hood 1. Additionally, the end of the interchangeable lens 50 on the side where the lens connection part 52 is provided will be referred to as the "front end" of the interchangeable lens 50, and the end on the opposite side will be referred to as the "rear end" of the interchangeable lens 50.

[0030] Fig. 4 is a perspective view showing the lens hood 1 attached in reverse to an interchangeable lens 50. As shown in Fig. 4, the lens hood 1 is configured so that it can be attached to the interchangeable lens 50 with the front-to-rear direction of the lens hood 1 reversed. The lens hood 1 can be attached in reverse as shown in Fig. 4, for example, as a form of storing the lens hood 1 when the imaging device is not in use.

[0031] In this case, the lens hood 1 can be attached to the interchangeable lens 50 by covering the interchangeable lens 50 from the opening on the front end side of the lens hood 1 so as to store it inside the lens hood 1, engaging the hood connection part 3 of the lens hood 1 with the lens connection part 52 of the interchangeable lens 50, and rotating the lens hood 1 in the circumferential direction. Note that in the following explanation, the method of attaching the lens hood 1 in the direction as shown in Figure 3 will also be referred to as "correct attachment."

[0032] <Configuration of hood connection part 3> Fig. 5 is a diagram showing the configuration of the hood connection part 3 of the lens hood 1. The hood connection part 3 shown in Fig. 5 is a perspective view of the hood connection part 3 detached from the hood main body 2, viewed from the side to which the hood main body 2 is attached.

[0033] As shown in FIG. 5, a rail portion 10 is provided on the inner peripheral surface of the hood connection part 3. The rail portion 10 is a portion that slides against the flange portion 53 of the interchangeable lens 50 when the lens hood 1 is rotated to attach the lens hood 1 to the interchangeable lens 50. The rail portions 10 are provided in the same number as the number of the flange portions 53 of the interchangeable lens 50. In the hood connection part 3 of this example, two rail portions 10 are provided so as to face each other. Moreover, the two rail portions 10 are formed to have a length corresponding to the length of the flange portion 53 of the interchangeable lens 50. For example, the rail portion 10 may be formed in a groove shape that engages with the flange portion 53 of the interchangeable lens 50. The rail portion 10 has a bayonet structure. The rail portion 10 is an example of an "engagement portion" in the present invention.

[0034] One end of the rail portion 10 is provided with a rail locking portion 11 that can be locked to the flange portion 53 of the interchangeable lens 50. The rail locking portion 11 is a portion that can be locked to the end of the flange portion 53 in the opposite direction to the rotation direction of the lens hood 1 when the lens hood 1 is rotated to attach the lens hood 1 to the interchangeable lens 50. The rail locking portion 11 is formed as a protrusion that protrudes from the rail portion 10 inward in the radial direction of the lens hood 1.

[0035] The rail portion 10 is provided with urging members 12a and 12b capable of urging the flange portion 53 of the interchangeable lens 50 engaged with the rail portion 10 inward in the radial direction of the lens hood 1. The urging member 12a is provided adjacent to the rail locking portion 11 on the rail portion 10. The urging member 12a is provided on the rotational direction side of the lens hood 1 relative to the rail locking portion 11 when the lens hood 1 is rotated in the circumferential direction of the interchangeable lens 50 to attach the lens hood 1 to the interchangeable lens 50.

[0036] In contrast, urging member 12b is provided at the end of rail portion 10 opposite to the end where rail locking portion 11 is provided. Urging member 12b is provided at the end on the rotation direction side of lens hood 1 when lens hood 1 is rotated in the circumferential direction of interchangeable lens 50 when attaching lens hood 1 to interchangeable lens 50. Urging members 12a and 12b are an example of a "first urging portion" in the present invention.

[0037] In addition to the biasing members 12a and 12b, biasing members 12c and 12d are provided. The biasing members 12c and 12d are capable of biasing the flange portion 53 of the interchangeable lens 50 inward in the radial direction of the lens hood 1 when the lens hood 1 is attached inversely to the interchangeable lens 50 (see FIG. 4). The biasing member 12c is provided on the inner circumferential surface of the hood connection portion 3 between the biasing member 12b and the lever member 20. The biasing member 12d is provided on the inner circumferential surface of the hood connection portion 3 between the biasing member 12a and the biasing member 12b.

[0038] Furthermore, a lever member 20 is provided on the inner periphery side of the hood connection part 3. The lever member 20 extends in the circumferential direction of the hood connection part 3 so as to follow the rail part 10. The lever member 20 is provided on the opposite side to the end side of the rail part 10 where the rail locking part 11 is provided. The lever member 20 has a rotation shaft 21 in the center. Furthermore, the lever member 20 has the above-mentioned push button 22 at one end, and has a lever protrusion part 23 at the end opposite to the side where the push button 22 is provided.

[0039] The rotation shaft 21 is provided so as to extend in the front-to-rear direction of the lens hood 1, that is, so as to be aligned with the optical axis X of the interchangeable lens 50 when the lens hood 1 is attached to the interchangeable lens 50. One end of the rotation shaft 21 is fitted into a shaft hole 13 formed in the hood connection part 3. The other end of the rotation shaft 21 (the end of the rotation shaft 21 visible in FIG. 5) is fitted into a shaft hole (described later in FIG. 15) formed in the hood body 2 to which the hood connection part 3 is attached.

[0040] The push button 22 is provided so as to face outward in the radial direction of the lens hood 1. In contrast, the lever protrusion 23 is provided so as to face inward in the radial direction of the lens hood 1. The lever member 20 is configured to be rotatable around a rotation shaft 21.

[0041] The push button 22 is provided with a biasing spring 24, which is an example of a "second biasing portion" in the present invention. The biasing spring 24 is provided on the inside of the push button 22 in the radial direction of the lens hood 1. The biasing spring 24 biases the push button 22 outward in the radial direction of the lens hood 1. As a result, the lever protrusion 23, which is disposed on the opposite side across the rotation shaft 21, is biased inward in the radial direction of the lens hood 1. When not in operation, the push button 22 is provided in a state in which it protrudes slightly outward from the outer circumferential surface of the lens hood 1 due to the bias of the biasing spring 24 (see, for example, FIG. 3). The push button 22 is an example of a "push portion" in the present invention.

[0042] When the push button 22 is not pressed, the lever protrusion 23 is biased inward in the radial direction of the lens hood 1 by the biasing force of the biasing spring 24. Therefore, the lever protrusion 23 biased inward in the radial direction is configured to engage with one end of the flange portion 53 of the interchangeable lens 50 when the lens hood 1 is attached to the interchangeable lens 50. Furthermore, when the push button 22 is pressed, the lever protrusion 23 moves outward in the radial direction of the lens hood 1 due to the rotation of the lever member 20. Therefore, the lever protrusion 23 moved outward in the radial direction is configured to move away from one end of the flange portion 53 of the interchangeable lens 50 when the lens hood 1 is attached to the interchangeable lens 50. The lever protrusion 23 is an example of a "protrusion" in the present invention.

[0043] The length of the flange portion 53 of the interchangeable lens 50 is formed to be slightly shorter than the length between the rail locking portion 11 and the lever protrusion 23 on the rail portion 10. Therefore, when the lens hood 1 is attached to the interchangeable lens 50 and the flange portion 53 is disposed along the rail portion 10 between the rail locking portion 11 and the lever protrusion 23, a small gap is provided as an attachment margin for the lens hood 1 at least either between one end of the flange portion 53 and the rail locking portion 11, or between the other end of the flange portion 53 and the lever protrusion 23.

[0044] When the lens hood 1 is attached to the interchangeable lens 50 and the flange portion 53 is engaged (disposed) between the rail locking portion 11 and the lever protrusion 23, the lever protrusion 23 functions as part of a restraining mechanism capable of restraining one end of the flange portion 53. The rail locking portion 11 also functions as part of a restraining mechanism capable of restraining the other end of the flange portion 53. When the lens hood 1 is attached to the interchangeable lens 50, the lever protrusion 23 and the rail locking portion 11 restrain both ends of the flange portion 53.

[0045] The lever member 20 including the lever protrusion 23 and the rail engagement portion 11 of the rail portion 10 are an example of a "restraint mechanism" in the present invention. The position of the lever member 20 where the lever protrusion 23 restrains one end of the flange portion 53 is an example of a "first position" in the present invention. The position of the lever member 20 where the lever protrusion 23 releases the restraint of one end of the flange portion 53 is an example of a "second position" in the present invention. The "first position" and the "second position" may be reversed. When the push button 22 is pressed, the lever member 20 is displaced from a position where it restrains one end of the flange portion 53 to a position where it releases the restraint. When the push button 22 is not pressed, the lever member 20 is maintained in a position where it restrains one end of the flange portion 53 by the bias of the bias spring 24.

[0046] In addition, a sloped portion 3a is formed on the outer peripheral surface of the hood connection portion 3. The outer peripheral surface is the surface (outer surface) in the direction away from the optical axis X of the interchangeable lens 50. The sloped portion 3a is formed so that its diameter becomes smaller as it moves away from the hood main body 2, that is, toward the rear end of the lens hood 1. In addition, the filter operation window 40 provided in the hood connection portion 3 is provided in a position shifted by approximately 90 degrees from the position of the push button 22 of the lever member 20 in the circumferential direction of the hood connection portion 3.

[0047] Fig. 6 is a diagram showing an example of the biasing force applied to the interchangeable lens 50 from the hood connection part 3 in the normal orientation. When the lens hood 1 is attached to the interchangeable lens 50 in the normal orientation, as shown in Fig. 6, biasing members 12a, 12b of the hood connection part 3 apply biasing forces F1, F2 to the flange part 53 of the interchangeable lens 50. Note that Fig. 6 only shows the hood connection part 3, and the interchangeable lens 50 located inside the hood connection part 3 is omitted.

[0048] When the lens hood 1 is attached to the interchangeable lens 50, that is, when the flange portion 53 of the interchangeable lens 50 engages along the rail portion 10 of the lens hood 1 and the flange portion 53 is restrained between the rail locking portion 11 and the lever protrusion portion 23, a biasing force F1 is applied from the biasing member 12a to the flange portion 53, and a biasing force F2 is applied from the biasing member 12b to the flange portion 53. When the lens hood 1 is attached to the interchangeable lens 50, the biasing member 12a applies a biasing force F1, as indicated by the arrow, to the flange portion 53 in the radial direction of the rotation of the rail portion 10 (hood connection portion 3). Similarly, when the lens hood 1 is attached to the interchangeable lens 50, the biasing member 12b applies a biasing force F2 to the flange portion 53 in the radial direction of the rotation of the rail portion 10.

[0049] When two biasing members 12a, 12b are provided as in this example, the resultant force of the biasing force F1 of the biasing member 12a and the biasing force F2 of the biasing member 12b is in the direction of a resultant force F3, which is the radial direction of rotation of the rail portion 10, as shown by the arrow. The radial direction of rotation of the rail portion 10 is, for example, a direction intersecting with the optical axis X (see FIG. 3).

[0050] However, when the number of the urging members provided on the rail portion 10 is, for example, one, the direction of the resultant force coincides with the direction of the urging force of the one urging member. When there is one urging member, the urging member is provided, for example, at the position of the urging member 12e in FIG. 6. The direction of the urging force F4 of the urging member 12e coincides with the direction of the resultant force F3. In this way, when there is only one urging member, the position of the urging member 12e is as shown in FIG. 6 in order to make the direction of the urging force coincide with the direction of the resultant force F3. On the other hand, when there are multiple urging members, it is only necessary to make the direction of the resultant force of the urging forces coincide with the direction of the resultant force F3, so that the position of the urging member can be selected, and the degree of freedom in design is improved.

[0051] 5 and 6, screws 14a, 14b, and 14c provided along the inner periphery of hood connecting portion 3 are some of the screws for attaching hood connecting portion 3 to hood body 2. As shown in FIG.

[0052] Fig. 7 is a diagram showing the hood connection part 3 of the lens hood 1 attached in a normal position to the lens connection part 52 of the interchangeable lens 50. When the hood connection part 3 is attached in a normal position to the lens connection part 52, the lever member 20 provided on the hood connection part 3 rotates by the bias of the biasing spring 24, and the lever protrusion 23 of the lever member 20 engages with one end part 53a of the flange part 53 of the lens connection part 52, as shown in Fig. 7. The engagement corner part 23a provided on the corner of the lever protrusion part 23 on the flange part 53 side engages with one end part 53a of the flange part 53.

[0053] When viewed from the lens connection portion 52 side, the direction in which one end 53a of the flange portion 53 engages with the engagement corner 23a of the lever protrusion portion 23 is the engagement direction E1 indicated by the arrow in the normal orientation. This engagement direction E1 coincides with the direction of resultant force F3 (see FIG. 6) which is the direction of the resultant force of the biasing force F1 by the biasing member 12a of the hood connection portion 3 and the biasing force F2 by the biasing member 12b.

[0054] 8 is a diagram showing an example of the urging force applied from the hood connection part 3 to the interchangeable lens 50 in the reverse installation. When the lens hood 1 is attached to the interchangeable lens 50 in the reverse installation, as shown in FIG. 8, urging forces F4 and F5 are applied from the urging members 12c and 12d of the hood connection part 3 to the flange part 53 of the interchangeable lens 50. In this way, when the lens hood 1 is attached to the interchangeable lens 50 in the reverse installation, the flange part 53 of the interchangeable lens 50 is configured to be disposed along the region where the urging members 12c and 12d of the lens hood 1 are provided. The urging members 12c and 12d urge both ends of one of the flange parts 53 of the interchangeable lens 50 inward in the radial direction of the lens hood 1. In this case, the resultant force of the urging force F4 of the urging member 12c and the urging force F5 of the urging member 12d becomes a resultant force F6.

[0055] Fig. 9 is a diagram showing the hood connection part 3 of the lens hood 1 attached in reverse to the lens connection part 52 of the interchangeable lens 50. When the hood connection part 3 is attached in reverse to the lens connection part 52, the lever member 20 provided on the hood connection part 3 rotates by the bias of the biasing spring 24, and the lever protrusion 23 of the lever member 20 engages with one end part 53b of the flange part 53 of the lens connection part 52, as shown in Fig. 9. The engagement corner part 23c provided at the corner of the flange part 53 of the lever protrusion part 23 engages with one end part 53b of the flange part 53.

[0056] When viewed from the lens connection portion 52 side, the direction in which one end 53b of the flange portion 53 engages with the engagement corner portion 23c of the lever protrusion portion 23 becomes the engagement direction E2 indicated by the arrow in the reverse attachment. This engagement direction E2 coincides with the direction of the resultant force F6 (see FIG. 8) which is the direction of the resultant force of the biasing force F4 by the biasing member 12c of the hood connection portion 3 and the biasing force F5 by the biasing member 12d.

[0057] <Configuration of the biasing members 12a and 12b> Fig. 10 is a diagram showing an example of a biasing member 12a provided on the rail portion 10 of the hood connection portion 3. As shown in Fig. 10, the biasing member 12a has a biasing protrusion 121 and mounting arms 122, 123 provided on both sides of the biasing protrusion 121. The biasing protrusion 121 is a portion that biases the flange portion 53 of the interchangeable lens 50. The mounting arms 122, 123 are arms for attaching the biasing member 12a to the rail portion 10.

[0058] Fig. 11 is a diagram showing an example of a mounting recess 131 to which the urging member 12a is attached. As shown in Fig. 11, the mounting recess 131 is formed adjacent to the rail locking portion 11 provided at one end of the rail portion 10. Mounting grooves 132, 133 are formed in the mounting recess 131 in a direction along the rail portion 10. The mounting arms 122, 123 of the urging member 12a are press-fitted into the mounting grooves 132, 133, whereby the urging member 12a is attached to the mounting recess 131. The urging member 12a is attached in a state in which the urging protrusion 121 protrudes inward in the radial direction of the lens hood 1 beyond the inner circumferential surface of the rail portion 10.

[0059] <Configuration of lever member 20> Fig. 12 is a perspective view showing an example of the lever member 20 as viewed from the side where the lever protrusion 23 is provided. Fig. 13 is a perspective view showing an example of the lever member 20 as viewed from the side where the push button 22 is provided. The lever member 20 shown in Fig. 5 is in a state where the lever member 20 of Figs. 12 and 13 is attached in a direction such that the end of the rotating shaft 21 visible in Figs. 12 and 13 is inserted into the shaft hole 13 of the hood connection part 3. The lever member 20 is attached so that the axial direction G of the rotating shaft 21 is aligned with the direction of the optical axis X of the interchangeable lens 50.

[0060] 12 and 13, the lever member 20 has a sloped portion 26 formed on a surface facing away from the optical axis X of the interchangeable lens 50. The surface facing away from the optical axis X is the outer surface in the radial direction of the lens hood 1. Specifically, the surface on which the sloped portion 26 is formed is the surface of the lever member 20 on which the push button 22 is provided, as shown in FIG. 13. The sloped portion 26 is an example of a "first sloped portion" in the present invention.

[0061] The inclined surface portion 26 is formed as an inclined surface in which the distance from the optical axis X becomes shorter as it goes in a first direction along the optical axis X, that is, the thickness T of the lever member 20 becomes thinner. The first direction is, for example, a direction along the optical axis X and toward the opposite side (rear end side) of the tip (front end) of the lens hood 1. Specifically, the first direction is a direction toward the end side (right side) of the visible rotating shaft 21 in the axial direction G in the lever member 20 shown in Figs. 12 and 13. Also, the first direction is a direction of the shaft hole 13 into which the rotating shaft 21 is fitted in the lever member 20 shown in Fig. 5. For example, the lever member 20 is processed so that the thickness T is thinner by chamfering the surface in the direction away from the optical axis X.

[0062] Further, the rotation axis 21 of the lever member 20 is provided at a concave-shaped fulcrum portion 25 formed on the lever member 20. The fulcrum portion 25 is concave in the direction along the optical axis X. Further, the fulcrum portion 25 is concave when viewed from the direction intersecting the optical axis X. The concave shape in the direction along the optical axis X means that the width of the lever member 20 in the direction along the optical axis X at the fulcrum portion 25 is shorter than the width of the lever member 20 in other portions. For example, if the width of the lever member 20 in the region of the fulcrum portion 25 is the lever width W2 and the width of the lever member 20 in the region other than the fulcrum portion 25 is the lever width W1, then the relationship is W2 < W1. Therefore, as shown in FIGS. 12 and 13, the end portion of the rotation axis 21 on the side fitted into the shaft hole 13 is accommodated within the concave-shaped fulcrum portion 25 and is arranged at a position recessed more than the width end of the region of the lever width W1 in the lever member 20.

[0063] Also, as shown in FIG. 12, the lever protrusion 23 of the lever member 20 is formed of two protrusions (the first protrusion 223 and the second protrusion 224). The first protrusion 223 and the second protrusion 224 are provided so as to overlap in the direction of the rotation axis 21. The first protrusion 223 is a protrusion that engages with the flange portion 53 of the interchangeable lens 50 when the lens hood 1 is correctly attached to the interchangeable lens 50. The second protrusion 224 is a protrusion that engages with the flange portion 53 of the interchangeable lens 50 when the lens hood 1 is reversely attached to the interchangeable lens 50.

[0064] As described with reference to FIG. 7, the first protrusion 223 is provided with an engaging corner portion 23a that engages with one end portion 53a of the flange portion 53 when the lens hood 1 is correctly attached. Further, the second protrusion 224 is provided with an engaging corner portion 23b (not shown) that engages with one end portion of the flange portion 53 when the lens hood 1 is reversely attached.

[0065] <Position of the biasing spring 24 with respect to the push button 22> Fig. 14 is a cross-sectional view of the push button 22 and the biasing spring 24 of the lever member 20 provided in the hood connection part 3. The push button 22 and the biasing spring 24 in Fig. 14 are a vertical cross-sectional view of the push button 22 and the biasing spring 24 in the hood connection part 3 shown in Fig. 5, for example, taken along a plane including the optical axis X and along the optical axis X. As shown in Fig. 14, the biasing spring 24 is provided at a position where at least a part of the biasing spring 24 overlaps with the push button 22 when viewed in the pressing direction H of the push button 22.

[0066] <Position of the rotation axis 21 of the lever member 20 relative to the hood connection portion 3> Fig. 15 is a cross-sectional view showing the position of rotation shaft 21 of lever member 20 provided on hood connection portion 3. As shown in Fig. 15, one end 21a of rotation shaft 21 of lever member 20 is fitted into shaft hole 13 (see Fig. 5) formed in hood connection portion 3. In addition, the other end 21b of rotation shaft 21 is fitted into shaft hole 15 formed in hood body 2.

[0067] The rotation shaft 21 of the lever member 20 is provided at a position where at least a part of the rotation shaft 21 overlaps with the inclined surface portion 3a of the hood connection part 3 when viewed in the axial direction G of the rotation shaft 21. The rotation shaft 21 of the lever member 20 is provided on a concave fulcrum portion 25, and is provided in a state where it is recessed with respect to the end of the lever member 20 in the width direction. For this reason, for example, when the lever member 20 is provided on the inner peripheral side of the hood connection part 3 as shown in FIG. 5, even if the position of the rotation shaft 21 of the lever member 20 is provided so as to overlap with the position of the inclined surface portion 3a in the hood connection part 3 where the space is narrow, it is possible to fit the shaft hole 13 of the hood connection part 3 that supports the end 21a of the rotation shaft 21 into the limited space within the narrowed inclined surface portion 3a. The hood connection part 3, or the hood main body 2 and the hood connection part 3 are an example of the "hood member" in the present invention. The inclined surface portion 3a is an example of the "second inclined surface portion" in the present invention. The inclination direction of the inclined surface portion 26 of the lever member 20 described with reference to FIG.

[0068] <Attaching lens hood 1 to interchangeable lens 50> Below, we will explain how to attach the lens hood 1 correctly to the interchangeable lens 50. First, the lens hood 1 is pressed onto the interchangeable lens 50 along the optical axis X, and the hood connection part 3 of the lens hood 1 is placed over the outer periphery of the lens connection part 52 of the interchangeable lens 50. At this time, the lens hood 1 is pressed into the interchangeable lens 50 so that the rail part 10 does not overlap the position of the flange part 53 of the interchangeable lens 50 in the circumferential direction of the lens hood 1.

[0069] Next, the placed lens hood 1 is rotated in the circumferential direction of the interchangeable lens 50. When rotated, the lever protrusion 23 of the lens hood 1 comes into contact with the flange portion 53 of the interchangeable lens 50, and the lever protrusion 23 is pushed by the flange portion 53 and moves outward in the radial direction of the lens hood 1 (retracts). This causes the rail portion 10 of the lens hood 1 to slide and rotate along the flange portion 53 of the interchangeable lens 50. The lens hood 1 rotates until the end of the flange portion 53 engages with the rail engaging portion 11 provided at the end of the rail portion 10, thereby placing the rail portion 10 along the flange portion 53.

[0070] When the rail portion 10 is placed along the flange portion 53, the lever member 20 rotates about the rotation axis 21 due to the bias of the biasing spring 24, and the lever protrusion 23 moves inward in the radial direction of the lens hood 1. This causes the engagement corner 23a of the lever protrusion 23 to engage with one end 53a of the flange portion 53 (see FIG. 7). In this way, by the engagement corner 23a of the lever protrusion 23 engaging with one end 53a of the flange portion 53, the flange portion 53, which was restrained with a gap between it and the rail locking portion 11 or between it and the lever protrusion 23 as an attachment margin, is pressed and locked by the engagement corner 23a without any gap. This suppresses rattling of the lens hood 1 in the circumferential direction relative to the interchangeable lens 50.

[0071] Furthermore, one end 53a of the flange portion 53 is pushed (pushed in the engagement direction E1 in FIG. 7) by the engagement corner 23a of the lever protrusion 23, so that a biasing force F1 is applied to the flange portion 53 from the biasing member 12a provided on the rail portion 10, and a biasing force F2 is applied to the flange portion 53 from the biasing member 12b. As a result, a resultant force F3 of the biasing forces F1 and F2 is applied to the interchangeable lens 50 in the radial direction of the rotation of the rail portion 10, suppressing rattling of the lens hood 1 relative to the interchangeable lens 50 in the radial direction.

[0072] Note that the procedure for removing the attached lens hood 1 from the interchangeable lens 50 is as follows. First, press the push button 22. When the push button 22 is pressed, the lever member 20 rotates about the rotation shaft 21, the push button 22 moves inward in the radial direction of the lens hood 1, and the lever protrusion 23 moves outward in the radial direction of the lens hood 1. This releases the engagement of the lever protrusion 23 of the lever member 20 with the flange portion 53 of the interchangeable lens 50, and the constraint on the flange portion 53 is released.

[0073] Next, the lens hood 1 is rotated in the circumferential direction opposite to that when it was attached. This causes the rail portion 10 of the lens hood 1 to slide and rotate along the flange portion 53 of the interchangeable lens 50, making it possible to remove the lens hood 1 from the interchangeable lens 50 in the direction along the optical axis X.

[0074] Incidentally, the lens hood 1 attached to the interchangeable lens 50 is generally formed with a larger diameter than the interchangeable lens 50 so as not to obstruct the imaging angle of view of the interchangeable lens 50. This results in the overall size of the lens hood 1 becoming larger, and it is desirable to make the lens hood as slim as possible in terms of both appearance and user operability. Therefore, the inventors attempted to slim down the lens hood 1 (improve the appearance) by improving the configuration of the hood connection portion 3 in the lens hood 1 connected to the interchangeable lens 50.

[0075] As described above, the lens hood 1 in this embodiment has a rail portion 10 that engages with the flange portion 53 of the interchangeable lens 50, and a restraining mechanism that restrains both ends of the flange portion 53. The restraining mechanism includes a lever member 20 that can switch between restraining and releasing the flange portion 53 depending on the rotational state of the lens hood 1. The lever member 20 has a sloped portion 26 formed on a surface that is disposed on the outside in the radial direction of the lens hood 1, and the fulcrum portion 25 where the rotation shaft 21 is provided is formed in a concave shape. The sloped portion 26 is formed so as to follow the inclination direction of the sloped portion 3a of the hood connection portion 3.

[0076] According to this configuration, the thickness of the lever member 20 can be reduced by forming the slope portion 26 on the outer surface of the lever member 20. Also, by forming the slope portion 26 so that the slope direction is aligned with the slope portion 3a of the hood connection portion 3, the lever member 20 can be efficiently stored in the space inside the lens connection portion 52 narrowed by providing the slope portion 26. Also, the width (lever width W1) of the lever member 20 is widened to compensate for the strength of the lever member 20 reduced by reducing the thickness, but by disposing the rotation shaft 21 of the lever member 20 inside the concave fulcrum portion 25, the expansion of the lever member 20 in the width direction can be suppressed. Therefore, even with this configuration, the lever member 20 can be efficiently stored in the space inside the lens connection portion 52 narrowed by providing the slope portion 26. Therefore, a lens hood 1 can be provided that can ensure strength while maintaining a good appearance.

[0077] Furthermore, in a configuration in which the lens hood 1 is attached to the tip of the interchangeable lens 50 in a bayonet fashion, for example, some gap is required as an attachment margin between the end of the flange portion 53 of the interchangeable lens 50 and the rail engagement portion 11 of the lens hood 1, or between the end of the flange portion 53 and the lever protrusion 23 of the lens hood 1, for ease of attachment or to prevent deformation of the lens hood due to temperature changes. However, if a gap is provided between the two components, this gap can cause the lens hood to wobble relative to the interchangeable lens when the lens hood is attached to the interchangeable lens. Therefore, while providing a gap as an attachment margin, measures are required to prevent wobbling of the lens hood when attached.

[0078] In contrast, with the lens hood 1 of the present embodiment, when the lens hood 1 is attached to the interchangeable lens 50 and the flange portion 53 of the interchangeable lens 50 is restrained between the rail engagement portion 11 and the lever protrusion portion 23 of the lens hood 1, a urging force F1 is applied to the flange portion 53 from the urging member 12a, and a urging force F2 is applied to the flange portion 53 from the urging member 12b.

[0079] In the case of normal attachment, the direction of the resultant force F3 of the biasing force F1 of the biasing member 12a and the biasing force F2 of the biasing member 12b coincides with the engagement direction E1 in which one end 53a of the flange portion 53 engages with the engagement corner portion 23a of the lever protrusion 23. By thus aligning the direction of the resultant force F3 of the biasing forces F1 and F2 with the engagement direction E1 of the flange portion 53 and the lever protrusion 23, it is possible to suppress rattling of the lens hood 1 relative to the interchangeable lens 50 in the radial direction and in the circumferential direction (rotational direction). This makes it possible to improve the adhesion of the lens hood 1 to the interchangeable lens 50.

[0080] In addition, in the case of reverse attachment, the direction of the resultant force F6 of the biasing force F4 of the biasing member 12c and the biasing force F5 of the biasing member 12d is configured to coincide with the engagement direction E2 in which one end 53b of the flange portion 53 engages with the engagement corner portion 23c of the lever protrusion portion 23. In this way, by making the direction of the resultant force F6 of the biasing forces F4 and F5 coincide with the engagement direction E2 of the flange portion 53 and the lever protrusion portion 23, it is possible to suppress rattling in the radial direction and in the circumferential direction (rotational direction) of the lens hood 1 relative to the interchangeable lens 50, as in the case of normal attachment. This makes it possible to improve the adhesion of the lens hood 1 to the interchangeable lens 50.

[0081] Furthermore, according to the lens hood 1, the biasing spring 24 provided on the push button 22 is provided at a position where at least a portion of the biasing spring 24 overlaps with the push button 22 when viewed in the pressing direction H of the push button 22. For this reason, the pressing force applied when the push button 22 is pressed is easily applied to the biasing spring 24 in the pressing direction H, and rattling of the lever member 20 caused by pressing the push button 22 can be suppressed compared to, for example, a case where the push button 22 and the biasing spring 24 do not overlap when viewed in the pressing direction H.

[0082] <Modification> In the above embodiment, a case has been described in which the restraining mechanism including the lever member 20 is provided on the lens hood 1 side, but the present invention is not limited to this. The restraining mechanism may be provided on the (lens device) side of the interchangeable lens 50, for example. A case in which the restraining mechanism is provided on the interchangeable lens 50 side will be described with reference to Figs. 16 to 18.

[0083] 16 is a perspective view showing an example of an interchangeable lens 50 provided with a restraining mechanism. The restraining mechanism is provided in a lens connection part 52 attached to the front end part of the interchangeable lens 50. The lens connection part 52 is detachable from the lens barrel 51. The outer peripheral surface of the lens connection part 52 is provided with a slope part 52a whose diameter gradually decreases toward the lens barrel 51. This slope part 52a is a slope part corresponding to the slope part 3a provided in the hood connection part 3 in the above embodiment.

[0084] The lens connection part 52 is configured to be connected to the hood connection part 3 of the lens hood 1. Although not shown, the hood connection part 3 of the lens hood 1 is provided with a flange part (engaged part) whose both ends are restrained by the restraining mechanism of the lens connection part 52. The flange part provided on the hood connection part 3 has a similar configuration to the flange part 53 of the lens connection part 52 described in FIG. 2 in the above embodiment, for example.

[0085] Fig. 17 is a perspective view showing the configuration of the lens connection part 52 in the interchangeable lens 50. Fig. 18 is a plan view of the lens connection part 52 shown in Fig. 17. Note that, among the parts of the lens connection part 52 shown in Figs. 17 and 18, parts having the same functions as the parts of the hood connection part 3 described in Figs. 5 and 6 in the above embodiment are denoted by the same reference numerals.

[0086] 17 and 18, the inner periphery of the lens connection part 52 is provided with a rail portion 10 that engages with the flange portion of the lens hood 1, and a restraining mechanism that restrains both ends of the flange portion of the lens hood 1. The restraining mechanism includes a lever member 20 that can switch between restraining and releasing the flange portion of the lens hood 1 by rotating about a rotation shaft 21. The lever member 20 has a sloped portion 26 (see FIG. 13) that is formed so as to follow the slope of the sloped portion 52a of the lens connection part 52. Furthermore, the rotation shaft 21 of the lever member 20 is provided within a fulcrum portion 25 that is formed in a concave shape.

[0087] Furthermore, the direction of the resultant force F3 of the biasing force F1 of the biasing member 12a and the biasing force F2 of the biasing member 12b is the radial direction of rotation of the rail portion 10 and coincides with the engagement direction E1 in which one end of the flange portion provided on the hood connection portion 3 of the lens hood 1 engages with the lever protrusion 23 of the lever member 20. For this reason, even when the constraint mechanism is provided on the interchangeable lens 50 side, it is possible to obtain the same effect as in the case of the lens hood 1 of the above-described embodiment. [Explanation of symbols]

[0088] 1 Lens hood 2 Hood body 3 Hood connection 3a,26,52a Slope section 10 Rail section 11 Rail locking part 12a to 12e Urging members 13,15 Shaft hole 14a~14c Bis 20 Lever member 21 Rotation axis 21a, 21b end 22 Press button 23 Lever protrusion 23a, 23b, 23c Engagement corner 24 Spring 25 Support 40 Filter operation window 50 Interchangeable Lenses 51 Lens barrel 52 Lens connection part 53 Flange 53a,53b One end 121 Urging protrusion 122,123 Mounting arm 131 Mounting recess 132,133 Mounting groove 223 1st protrusion 224 2nd protrusion E1,E2 Engagement direction F1,F2,F4 Force F3 resultant force W1,W2 Lever width

Claims

1. A lens accessory that is attached to a lens device, an engaging portion that engages with a receiving portion of the lens device; a restraining mechanism for restraining both ends of the engaged portion, the restraint mechanism includes a lever member that can be switched between the restraint and release states by rotation, the lever member has a first inclined surface formed on a surface facing away from the optical axis of the lens device, and the rotation fulcrum portion has a concave shape; Lens accessories.

2. The lens accessory according to claim 1 , the lever member is provided on a hood member having a second inclined surface portion on a surface facing away from the optical axis, The fulcrum portion of the lever member is provided at a position where at least a portion of the fulcrum portion overlaps with the second inclined surface portion when viewed in the direction of the rotation axis of the lever member. Lens accessories.

3. The lens accessory according to claim 1 , The first inclined surface portion has an inclined surface whose distance from the optical axis becomes shorter as it goes in a first direction along the optical axis. Lens accessories.

4. The lens accessory according to claim 3, The concave shape is a concave shape in a direction along the optical axis. Lens accessories.

5. The lens accessory according to claim 3, The concave shape is a concave shape when viewed from a direction intersecting the optical axis. Lens accessories.

6. The lens accessory according to claim 1 , The engagement portion has a bayonet structure, one or more first biasing portions that bias the engaged portion in a radial direction of rotation of the bayonet structure in the engaged state; The direction of the resultant force of the one or more first biasing portions includes a radial direction of rotation of the bayonet structure. Lens accessories.

7. The lens accessory according to claim 6, the lever member has a protrusion that engages with one end of the engaged portion in the restrained state, the direction of the resultant force is a direction in which one end of the engaged portion engages with the protruding portion in the restrained state; Lens accessories.

8. The lens accessory according to claim 6, The one or more first biasing portions are a plurality of biasing portions. Lens accessories.

9. A lens accessory according to any one of claims 1 to 8, the lever member has a depression portion, and is displaced from a first position to a second position by pressing down the depression portion; the restraining mechanism has a second biasing portion that maintains the lever member at the first position in the engaged state, The second biasing portion is provided at a position where at least a portion of the second biasing portion overlaps with the depression portion when viewed in a pressing direction of the depression portion. Lens accessories.

10. an engaging portion having a bayonet structure that engages with an engaged portion of the lens device; A restraining mechanism that restrains both ends of the engaged portion; and one or more biasing portions that bias the engaged portion in a radial direction of rotation of the bayonet structure in the engaged state, The direction of the resultant force of the one or more biasing portions is a radial direction of rotation of the bayonet structure. Lens accessories.

11. An engaging portion that engages with an engaged portion of the lens accessory; a restraining mechanism for restraining both ends of the engaged portion, the restraint mechanism includes a lever member that can be switched between the restraint and release states by rotation, The lever member has a slope formed on a surface facing away from the optical axis, and the fulcrum of rotation is concave. Lens device.

12. An engagement portion having a bayonet structure that engages with an engaged portion of the lens accessory; A restraining mechanism that restrains both ends of the engaged portion; and one or more biasing portions that bias the engaged portion in a radial direction of rotation of the bayonet structure in the engaged state, The direction of the resultant force of the one or more biasing portions is a radial direction of rotation of the bayonet structure. Lens device.

Images