JP2019124762A - interchangeable lens - Google Patents

Abstract

To provide a proper elastic member in a mount part of an interchangeable lens.SOLUTION: An interchangeable lens to be mounted to a camera body comprises: a lens side mount that engages with a body side mount of the camera body; and a protrusion part that is provided on an outer peripheral side of the lens side mount, and when the interchangeable lens is mounted to the camera body, contacts with an outer peripheral surface of the body side mount and is deformable in a radial direction of the lens side mount. The elastic member has a protrusion part that protrudes heading to the camera body from the lens side mount in a state with the interchangeable lens mounted to the camera body, and the protrusion part is a cylindrical shape with an optical axis of the interchangeable lens as a center, in which the shape is such that the larger an amount of protrusion from the lens side mount is, the larger an inner diameter of the protrusion part is.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an interchangeable lens.

  Among interchangeable lenses that can be attached to and removed from a camera body, waterproof rubber provided on a mount portion is known (Patent Document 1). In the prior art, there is room for improvement in the shape of the waterproof rubber.

Japanese Patent Application Publication No. 2003-15010

  An interchangeable lens according to an aspect of the present invention is an interchangeable lens mounted on a camera body, and is provided on an outer peripheral side of the lens side mount that fits with the body side mount of the camera body, and the lens side mount And a resilient member deformable in a radial direction of the lens side mount in contact with an outer peripheral surface of the body side mount when the lens is mounted on the camera body, the elastic member being the exchangeable lens The camera body has a projection projecting toward the camera body from the lens side mount in a state of being mounted on the camera body, and the projection is cylindrical with the optical axis of the interchangeable lens as a center, and the lens side The inner diameter is larger as the amount of protrusion from the mount is larger.

It is a perspective view which illustrates an interchangeable lens. It is a figure explaining the cross section of the position enclosed with the broken line of FIG. It is the figure which expanded the vicinity of the elastic member of FIG. (A) is a figure explaining the relationship between a lens side mount and a body side mount, (b) is an enlarged view in circle IVb of (a). It is a figure explaining the relationship between a lens side mount and a body side mount. It is a figure explaining the elastic member by modification 1. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view illustrating an interchangeable lens 3 according to an embodiment, and FIG. 2 is a view illustrating a cross section in a position surrounded by a broken line A in FIG.
The interchangeable lens 3 includes a so-called bayonet-type lens mount mechanism, and is configured to be attachable to and detachable from a camera body provided with a cylindrical body mount mechanism centered on the optical axis O.
In the present embodiment, the subject side in the direction along the optical axis O of the interchangeable lens 3 (hereinafter referred to as the optical axis O direction) is referred to as the front, and the camera body side in the optical axis O direction is the rear. Further, in the radial direction of the interchangeable lens 3, the one farther from the optical axis O is referred to as the outer side (outer periphery), and the one closer to the optical axis O is referred to as the inner side (inner periphery).

  In FIG. 1, the circumferential surface of the interchangeable lens 3 is covered by the outer cylinder 10. Behind the interchangeable lens 3, a cylindrical lens side mount 20 and a cylindrical elastic member 30 provided on the outer peripheral side of the lens side mount 20 are provided. The elastic member 30 has a function of securing water tightness at the joint portion between the interchangeable lens 3 and the camera body, as described in detail later.

  The cylindrical lens side mount 20 has an annular reference surface 23 in a plan view orthogonal to the optical axis O. The reference surface 23 abuts on the reference surface 123 (FIG. 5) of the body side mount when the interchangeable lens 3 is mounted on the camera body (not shown).

  The lens side mount 20 is screwed to the rear side of the interchangeable lens 3 using a screw 27. Referring also to FIG. 2, the lens side mount 20 is fixed by a screw 27 to a cylindrical fixing member (hereinafter also referred to as a fixed cylinder) 15 disposed inside the outer cylinder 10. In the example of FIG. 1, screws are screwed at three points of approximately 120 degrees around the optical axis O in the annular reference surface 23.

  Referring also to FIG. 2, the lens side mount 20 is formed with an annular reference surface 23, and a flange portion 20 </ b> A serving as an attachment portion to the fixing member 15 and a rear side on the inner peripheral side of the flange portion 20 </ b> A And an extending protrusion 24. The protrusion 24 is a cylindrical small-diameter small-diameter portion having a smaller diameter than the fitting portion 22 (large diameter portion) in which the outer peripheral surface is fitted to the camera body mount and the fitting portion 22 (large diameter portion) It has a portion (24) and a lens side claw portion 25 provided at the rear end of the small diameter portion (24). The fitting portion 22 (large diameter portion) has a predetermined width W in the optical axis O direction on the inner diameter side of the flange portion 20A. The protrusion 24 constitutes a part of the mount located rearward of the reference surface 23. When the interchangeable lens 3 is mounted on the camera body (not shown), the rear end of the projection 24 enters the camera body.

Each of the lens side claws 25 is protruded toward the outer side in the radial direction of the lens side mount 20 on the rear end side of the projection 24 and extends in a direction substantially orthogonal to the optical axis O. That is, at the rear end of the projection 24, a plurality of lens side claws 25 protruding in the outer diameter direction are provided with a predetermined circumferential length and a predetermined circumferential length. In the present embodiment, for example, three lens side claws 25 are provided.
The number of lens side claws 25 is not limited to three, and may be four or more.

  In FIG. 2, inside the outer cylinder 10, a fixed cylinder 15 which constitutes a part of the lens barrel is provided. The cylindrical lens side mount 20 is fixed to the fixed cylinder 15 via the annular spacer 17 using a screw 27 (FIG. 1). The spacer 17 may be omitted.

  The outer peripheral surface of the flange portion 20A of the lens side mount 20 is covered by a cylindrical elastic member 30. The elastic member 30 is made of, for example, rubber or the like, and can be elastically deformed. In the present embodiment, in the projecting portion C which is a portion of the elastic member 30 which protrudes rearward in the optical axis O direction with respect to the reference surface 23 of the lens side mount 20, elastic deformation as described later occurs.

  As described with reference to FIG. 1, the cylindrical protrusion 24 of the lens side mount 20 is extended from the inner peripheral side of the flange 20A to the rear in the optical axis O direction. If it explains more correctly, fitting part 22 which is a large diameter part extends backward from the inner circumference side of lens side mount 20, and further smaller than a large diameter part at the back of large diameter part (fitting part 22) A small diameter portion (24) having an outer diameter is extended. A lens side claw portion 25 is formed on the rear end side of the small diameter portion (24). The fitting portion 22 fits with a fitting portion 122 of a body side mount 120 (FIGS. 4 and 5) described later.

  As described above, the lens side claw portion 25 is provided at the rear end of the lens mount 20, in other words, at the rear end of the protrusion 24 in the optical axis O direction. Since the plurality of lens side claws 25 are spaced apart from each other in the circumferential direction around the optical axis O, the area where the lens side claws 25 are disposed at the rear end of the projection 24 ( Positions) and non-placed areas (positions) alternate.

<Protrusions of inner circumferential surface>
FIG. 3 is an enlarged view of the vicinity of the elastic member 30 of FIG. At the front end in the direction of the optical axis O, a protrusion 36 projecting radially inward is provided on the inner peripheral surface of the cylindrical elastic member 30. The inner diameter of the protrusion 36 is smaller than the outer diameter of the lens side mount 20. That is, the inner diameter of the protrusion 36 is smaller than the inner diameter of the portion of the elastic member 30 that covers the outer peripheral surface of the lens mount 20. Thus, the cross-sectional shape of the elastic member 30 is L-shaped.
The projecting portion 36 may not necessarily be annularly formed on the inner peripheral surface of the elastic member 30, and a portion may be omitted (for example, having a cut portion) along the inner periphery of the elastic member 30. Good.

  In the state where the lens side mount 20 is fixed to the fixed cylinder 15 by configuring the one-side cross section of the elastic member 30 to be L-shaped, even if the elastic member 30 is pulled backward, the projecting portion 36 is the lens side mount 20 Get caught. As a result, it is possible to prevent the elastic member 30 from coming off backward and coming off the interchangeable lens 3.

  In addition, in FIG. 3, the outer peripheral edge portion 21 at the front end of the lens side mount 20 is chamfered by, for example, polishing or the like to remove corner portions. When the outer peripheral edge portion 21 is not chamfered, after the spacer 17 and the elastic member 30 are first inserted into the fixed cylinder 15, the lens side mount 20 is screwed to the fixed cylinder 15 from the rear side. The projecting portion 36 of the elastic member 30 is crushed in the direction of the optical axis O by the corner of the front end of 20. By providing the chamfered outer peripheral edge portion 21, such crushing of the projecting portion 36 is prevented, and the workability at the time of assembling the interchangeable lens 3 is improved.

<Protrusions of outer peripheral surface>
On the outer peripheral surface of the elastic member 30, a protruding portion 35 protruding outward in the radial direction is provided at a position corresponding to substantially the center of the length L1 of the elastic member 30 in the optical axis O direction. The outer diameter of the protrusion 35 is larger than the outer diameter of the other portion of the elastic member 30.
The position of the protrusion 35 in the direction of the optical axis O may be a position corresponding to substantially the center of the length L2 in the direction of the optical axis O of the outer peripheral surface of the lens side mount 20 covered by the elastic member 30. .

In a state where the lens side mount 20 is fixed to the fixed cylinder 15, the projecting portion 35 of the elastic member 30 contacts the inner peripheral surface of the fixed cylinder 15, and the inner peripheral surface of the elastic member 30 is the outer peripheral surface of the lens side mount 20 Contact. In addition, the projecting portion 36 of the elastic member 30 contacts the spacer 17. Since it comprised in this way, the elastic member 30 is clamped by the lens side mount 20, the spacer 17, and the fixed cylinder 15, and the position is stabilized. Furthermore, water and the like that have entered the fixed cylinder 15 from the gap between the fixed cylinder 15 and the elastic member 30 is prevented from entering the front of the projecting portion 35.
Another member may be interposed between the lens side mount 20 and the elastic member 30. That is, another member may be provided on the outer periphery of the lens side mount 20, and the elastic member 30 may be provided on the outside of the member.

<Back protrusion>
Next, the shape of the protrusion C of the elastic member 30 will be described. In FIG. 3, the rear end 31 of the protruding portion C has, for example, a curved surface shape that connects the outer peripheral surface and the inner peripheral surface of the protruding portion C. In the present embodiment, a curved surface shape is exemplified as the shape of the rear end 31, but the shape may not necessarily be the curved surface shape. For example, the rear end 31 may be configured in a pointed shape connecting the outer peripheral surface and the inner peripheral surface of the protruding portion C, or the rear end 31 may be configured by a plane connecting the outer peripheral surface and the inner peripheral surface of the protruding portion C You may When the rear end 31 is configured by a plane, it may be a plane parallel to a plane orthogonal to the optical axis O.

  On the inner circumferential surface of the projecting portion C exposed rearward of the reference surface 23 of the lens side mount 20, the first inclined surface 33 is in the first range on the front side in the optical axis O direction, and on the rear side in the optical axis O direction. The second inclined surfaces 32 are respectively provided in the second range. The front side position (inclination start position) S1 of the first inclined surface 33 is located rearward of the reference surface 23 of the lens mount 20. The reason for this is to avoid the formation of an air gap between the outer peripheral surface of the lens side mount 20 and the elastic member 30.

  The diameters of the first inclined surface 33 and the second inclined surface 32 both gradually increase from the front to the rear in the projecting portion C of the elastic member 30. When the amount of change in the inner diameter per unit length in the direction of the optical axis O is referred to as the inclination angle, the inclined surface having a small amount of change in the inner diameter has a small inclination angle to the optical axis O, and the inclined surface having a large amount of change in the inner diameter has the optical axis The inclination angle to O is large. In the present embodiment, the inclination angle of the rear second inclined surface 32 is larger than the inclination angle of the front first inclined surface 33.

  A boundary between the first inclined surface 33 and the second inclined surface 32 (indicated by a point Q in FIG. 3) is a position of a distance W rearward from the reference surface 23 of the lens side mount 20. That is, on the inner peripheral surface of the protrusion C, the first inclined surface 33 is disposed between the reference surface 23 of the lens side mount 20 and the distance W, and the second inclined surface 32 is disposed behind the distance W .

The reason for arranging the first inclined surface 33 and the second inclined surface 32 having different inclination angles with the position Q of the distance W from the reference surface 23 is that the interchangeable lens 3 is mounted on a camera body (not shown) This is to prevent the protrusion C from being caught in the joint between the interchangeable lens 3 and the camera body.
The rear side of the second inclined surface 32 smoothly leads to the rear end 31.

  An inclined surface 34 is provided on the outer peripheral surface of the elastic member 30 exposed to the rear of the interchangeable lens 3. In the example of FIG. 3, the inclined surface 34 is formed over a predetermined range from the position of the reference surface 23 of the lens side mount 20 to the rear side. Therefore, the inclination start position S2 on the front side of the interchangeable lens of the embodiment is the position of the reference surface 23 of the lens side mount 20. The tilt start position S2 may be back and forth in the optical axis O direction with respect to the reference surface 23.

The inclined surface 34 has a shape in which the outer diameter of the protrusion C of the elastic member 30 changes gradually gradually from the front to the rear. When the amount of change of the outer diameter per unit length in the optical axis O direction is referred to as the inclination angle, in the present embodiment, the inclination angle of the inclined surface 34 of the outer peripheral surface in the projecting portion C is uniform. The reason is that by forming the protrusion C in a tapered shape toward the rear end 31, the protrusion C can be slippery when grasped. If the protrusion C is difficult to grasp, it can be prevented that the protrusion C is grasped and the elastic member 30 is pulled backward.
The rear side of the inclined surface 34 leads to the rear end 31.

<Elastic deformation of elastic member 30>
The deformation of the elastic member 30 which occurs when the interchangeable lens 3 is mounted on a camera body (not shown) will be described. FIGS. 4 and 5 are diagrams for explaining the relationship between the lens side mount 20 of the interchangeable lens 3 and the body side mount 120 of the camera body 130. FIG.

  FIG. 4 (b) is an enlarged view in a circle IVb of FIG. 4 (a). As shown in FIG. 4B, the rear end of the outer peripheral surface of the fitting portion 22 of the lens side mount 20 is chamfered to form a chamfered portion 22M. Similarly, the front end of the inner peripheral surface of the fitting portion 122 of the body side mount 120 is chamfered to form a chamfered portion 122M.

  The user aligns the index (not shown) attached to the outer peripheral surface of the outer cylinder 10 of the interchangeable lens 3 with the index (not shown) attached to the exterior surface of the camera body 130, The lens side claw portion 25 (FIG. 1, FIG. 2, the projection 24) of the interchangeable lens 3 is made to enter the inside of the cylindrical body side mount 120 (that is, the inside of the camera body 130) .

  Referring to FIG. 4B, when the fitting portion 22 of the lens side mount 20 is fitted with the fitting portion 122 of the body side mount 120, the fitting is started after the both come in contact at the point P. In the present embodiment, the distance W from the reference surface 23 of the lens side mount 20 to the point P in the optical axis O direction corresponds to the distance W from the reference surface 23 to the point Q of the lens side mount 20 in FIG. There is. In other words, the position P where the fitting portion 22 of the lens side mount 20 and the fitting portion 122 of the body side mount 120 start fitting, and the first inclined surface 33 on the inner peripheral surface of the projecting portion C of the elastic member 30 The position Q (FIG. 3) of the boundary with the second inclined surface 32 is at a distance W from the reference surface 23 of the lens side mount 20.

The reason is as follows. Before the lens side fitting portion 22 and the body side fitting portion 122 start fitting at the end (point P) of the fitting area, the position of the interchangeable lens 3 is displaced in the radial direction with respect to the camera body 130 There is a fear. Therefore, the projection C of the elastic member 30 can be replaced by the interchangeable lens 3 and the camera body 130 by increasing the inclination angle of the second inclined surface 32 of the elastic member 30 which may come into contact with the body side mount 120 with respect to the optical axis O. And between the reference surface 23 of the lens side mount 20 and the reference surface 123 of the body side mount 120).
On the other hand, after the lens side fitting portion 22 and the body side fitting portion 122 start fitting at the point P, the position of the interchangeable lens 3 is guided by the body side mount 120, so the position of the interchangeable lens 3 is There is no risk of radial displacement with respect to the camera body 130. Therefore, the projection of the elastic member 30 is made smaller by reducing the inclination angle of the first inclined surface 33 of the elastic member 30 which may come into contact with the body side mount 120 after the engagement is started at the point P with respect to the optical axis O. Elastically deform C in the radial direction.

The user rotates the interchangeable lens 3 in the mounting direction about the optical axis O while pressing the interchangeable lens 3 against the camera body 130 (ie, the body side mount 120). The fitting portion 22 of the lens side mount 20 is engaged with the fitting portion 122 of the body side mount 120 and moves rearward in the optical axis O direction. Then, as shown in FIG. 5, the reference surface 23 of the lens side mount 20 abuts on the reference surface 123 of the body side mount 120, and the movement of the lens side mount 20 stops.
When the range in the optical axis O direction in which the fitting portion 22 of the lens side mount 20 and the fitting portion 122 of the body side mount 120 fit is referred to as a fitting area, the point P is one end of the fitting area, that is, It corresponds to one end of the rear end side of the interchangeable lens 3.

  Among the inner diameters of the inner peripheral surface of the projecting portion C of the elastic member 30, the inner diameter of the boundary (point Q) between the first inclined surface 33 and the second inclined surface 32 in FIG. 3 is as shown in FIG. The outer diameter of the outer peripheral surface 126 of the body side mount 120 is substantially equal. The inner diameter of the front first inclined surface 33 in the projecting portion C is smaller than the outer diameter of the outer peripheral surface 126 of the body side mount 120 at any position in the optical axis direction. The inner diameter of the second inclined surface 32 is larger than the outer diameter of the outer peripheral surface 126 of the body side mount 120 at any position in the optical axis direction. With this configuration, in the process of transitioning from the state of FIG. 4A (fitting start state) to the state of FIG. 5 (fitting state), the first inner circumferential surface of the projecting portion C of the elastic member 30 is selected. The inclined surface 33 contacts the outer peripheral surface 126 of the body side mount 120. For this reason, the protrusion C of the elastic member 30 is pressed in the radial direction.

  The protruding portion C of the elastic member 30 is pressed by the outer peripheral surface 126 of the body side mount 120 to connect the interchangeable lens 3 and the camera body 130 (a reference surface of the lens side mount 20 and the reference of the body side mount 120) Water tightness at the junction with the surface 123 is ensured. Therefore, high dustproof and dripproof performance can be obtained.

In the present embodiment, the contact between the inner peripheral surface (first inclined surface 33) of the protruding portion C of the elastic member 30 and the outer peripheral surface 126 of the body side mount 120 is a substantially linear contact. The substantially linear contact means that the contact area is so small that it can be said to be a linear contact.
The advantage of reducing the contact area between the elastic member 30 and the outer peripheral surface 126 of the body side mount 120 is that the contact resistance at the time of rotation when attaching and detaching the interchangeable lens 3 can be reduced. If the contact resistance is large, the load when the user rotates the interchangeable lens 3 around the optical axis O at the time of attachment and detachment becomes large, and the operability becomes worse. However, if the contact resistance is small, the rotational load of the user at the time of attachment and detachment can be suppressed, and operability can be improved.

  As the state of FIG. 4A is shifted to the state of FIG. 5, the projecting portion C of the elastic member 30 elastically deforms outward in the radial direction (direction of the arrow) but does not deform in the optical axis O direction. Since it comprised in this way, the elastic member 30 elastically deformed generate | occur | produces the force which presses the outer peripheral surface 126 of the body side mount 120 from the outer side, and makes the reference plane 123 of the body side mount 120 the back of the optical axis O direction. Does not generate pushing force.

Further, in the present embodiment, the tip end portion 31 of the protruding portion C of the elastic member 30 does not contact the front surface of the camera body. Therefore, the step between the outer peripheral surface of the projecting portion C elastically deformed to the outer side in the radial direction (the direction of the arrow) of FIG. 5 and the outer peripheral surface 126 of the body side mount 120 is about 1 mm, for example. Since the step is small, the deformation of the elastic member 30 does not impair the appearance.
If the tip 31 of the projection C of the elastic member 30 is in contact with the front surface of the camera body, the projection C of the elastic member 30 is elastically deformed in the direction of the optical axis O. In this case, the step between the outer peripheral surface of the projecting portion C elastically deformed in the optical axis O direction and the outer peripheral surface 126 of the body side mount 120 becomes as large as, for example, about 1.3 mm. If the level difference is large, the disadvantage of impairing the appearance occurs. In addition, the elastic member 30 elastically deformed in the direction of the optical axis O generates a force that pushes the reference surface 123 of the body side mount 120 rearward in the direction of the optical axis O.

  Among the disadvantages described above, the disadvantages in which the elastic member 30 generates a force that pushes the reference surface 123 of the body mount 120 rearward in the optical axis O direction will be described in detail. In the example of FIG. 5, the interchangeable lens 3 is rotated with respect to the camera body (that is, the body side mount 120), and the body side claw portion 125 of the body side mount 120 enters the space in front of the lens side claw portion 25. At this time, the lens side claw portion 25 presses a plate spring (not shown) that biases the interchangeable lens 3 in the backward direction along the optical axis O provided in the body side claw portion 125. Here, since the leaf spring in the bayonet type lens mount mechanism is known, the description of the leaf spring is omitted. The shape and material of the plate spring may be any as long as they generate a predetermined biasing force to the lens side claw portion 25.

  The lens side claw portion 25 also has a function as a biased portion urged in a direction away from the body side claw portion 125 (rearward in the direction of the optical axis O) by the plate spring in contact. Therefore, when the lens side claw 25 contacts the plate spring (not shown) of the body side claw 125, the lens side claw 25 is pressed backward from the plate spring along the optical axis O. With this configuration, the lens side mount 20 is pressed toward the body side mount 120 by the biasing force of the leaf spring, and the reference surface 23 of the lens side mount 20 and the reference surface 123 of the body side mount 120 are in close contact Do. As a result, the mounting of the interchangeable lens 3 and the camera body is stabilized.

However, since the above-mentioned disadvantage of the elastic member 30 pushes the reference surface 123 of the body side mount 120 to the rear in the optical axis O direction, it acts in a direction to resist the biasing force of the plate spring. That is, the force emitted from the elastic member 30 impairs the stability of the attachment between the interchangeable lens 3 and the camera body.
However, in the present embodiment, the elastic member 30 is deformed in the radial direction more than the optical axis direction. Therefore, even if it is elastically deformed, the force of the above demerit, in other words, the direction against the biasing force of the plate spring Produces only a small force. As a result, the repulsive force of the elastic member 30 does not impair the mounting stability of the interchangeable lens 3 and the camera body.

According to the embodiment described above, the following effects can be obtained.
(1) The interchangeable lens 3 is provided on the lens side mount 20 fitted with the body side mount 120 of the camera body 130 and on the outer peripheral side of the lens side mount 20, and when the interchangeable lens 3 is mounted on the camera body 130 An elastic member 30 deformable in the radial direction of the lens side mount 20 is provided in contact with the outer peripheral surface 126 of the body side mount 120. The elastic member 30 has a projection C projecting rearward in the optical axis O direction of the interchangeable lens 3 from the reference surface 23 of the lens side mount 20 toward the camera body 130 in a state where the interchangeable lens 3 is mounted on the camera body 130 Have. The protrusion C has a cylindrical shape centered on the optical axis O of the interchangeable lens 3, and the inner diameter increases with distance from the reference surface 23 of the lens side mount 20.
Since it comprised in this way, the water tightness in the junction part of the interchangeable lens 3 and the camera body 130 is securable. Furthermore, by increasing the inner diameter of the protrusion C as the distance from the reference surface 23 of the lens side mount 20 increases, the elastic member 30 protrudes regardless of the position of the interchangeable lens 3 with respect to the camera body 130 in the optical axis direction. The contact area between the inner peripheral surface (first inclined surface 33) of the portion C and the outer peripheral surface 126 of the body side mount 120 can be reduced. Further, by deforming the elastic member 30 in the radial direction, a large force is not generated in the direction in which the elastically deformed elastic member 30 opposes the biasing force of the plate spring described above, and mounting of the interchangeable lens 3 and the camera body 130 Do not lose stability.

(2) The elastic member 30 is configured such that the outer diameter is smaller as it is separated from the reference surface 23 of the lens side mount 20. Therefore, it becomes difficult to grasp the projecting portion C, and the elastic member 30 can be prevented from being pulled backward. .

(3) The first range of the inner peripheral surface of the protrusion C is constituted by the first inclined surface 33, and the second range of the inner peripheral surface of the protrusion C is the optical axis O with the first inclined surface 33 of the first range. The second inclined surface 32 has different inclination angles. Furthermore, the first range and the second range are arranged side by side in the direction along the optical axis O. Since the inclination angle is changed stepwise, when the interchangeable lens 3 is mounted on the camera body 130, the protrusion C of the elastic member 30 is prevented from being caught in the joint portion between the interchangeable lens 3 and the camera body 130. it can.

(4) The second range of the protrusion C is disposed at a position farther from the reference surface 23 of the lens side mount 20 than the first range of the protrusion C, and the inclination angle of the second range is the first range Greater than the tilt angle of With this configuration, the projection C of the elastic member 30 is prevented from being caught in the joint between the interchangeable lens 3 and the camera body 130 by the second inclined surface 32 in the second range of the projection C, and the projection The protruding portion C of the elastic member 30 can be properly brought into contact with the outer peripheral surface 126 of the body side mount 120 by the first inclined surface 33 in the first range of the portion C.

(5) The lens side mount 20 has the lens side fitting portion 22 in which the inner peripheral surface and the outer peripheral surface of the body side fitting portion 122 of the body side mount 120 are fitted, and in the direction along the optical axis O, The boundary (point Q) between the first range and the second range substantially coincides with the end (point P) of the fitting region between the lens side fitting portion 22 and the body side fitting portion 122. With this configuration, when attaching the interchangeable lens 3 to the camera body 130, in the process of transitioning from the state of FIG. 4A to the state of FIG. The first inclined surface 33 can be properly brought into contact with the outer peripheral surface 126 of the body side mount 120.

(6) The interchangeable lens 3 includes the fixed barrel 15. The fixed barrel 15 is provided on the outer periphery of the elastic member 30, and constitutes a part of the lens barrel. The elastic member 30 has a protrusion 35 protruding outward in the radial direction on the outer peripheral surface, and the protrusion 35 contacts the inner peripheral surface of the fixed cylinder 15. Since it comprised in this way, it can prevent that the water etc. which approached into the fixed cylinder 15 from the clearance gap between the fixed cylinder 15 and the elastic member 30 infiltrate the front of the optical axis O direction rather than the protrusion part 35. FIG.

(7) The protrusion 35 of the elastic member 30 is provided at a substantially central portion in the direction along the optical axis O, so that the protrusion 35 is positioned forward or backward in the direction along the optical axis O The first inclined surface 33 of the first range of the projecting portion C of the elastic member 30 can be properly brought into contact with the outer peripheral surface 126 of the body side mount 120.

(8) The elastic member 30 has, at the other end (forward in the direction of the optical axis O) opposite to the protrusion C, a protrusion 36 projecting inward in the radial direction. Since the inner diameter of the protrusion 36 is smaller than the outer diameter of the lens mount 20, the protrusion 36 is caught on the lens mount 20 even if the elastic member 30 is pulled rearward in the optical axis O direction. For this reason, it is possible to prevent the elastic member 30 from coming off backward and coming off from the interchangeable lens 3.

(9) The projecting portion 36 is formed in an annular shape centering on the optical axis O, and the elastic member 30 is formed in a substantially L shape as a single-sided sectional shape in the direction along the optical axis O. Since it comprised in this way, even if the elastic member 30 is pulled back, the protrusion part 36 is hooked on the lens side mount 20. As shown in FIG. For this reason, it is possible to prevent the elastic member 30 from coming off backward and coming off from the interchangeable lens 3.

  The elastic member 30 was provided with one protrusion 35 on the outer peripheral surface thereof and one protrusion 36 on the inner peripheral surface. Thereby, for example, the die-cutting operation at the time of molding the elastic member 30 using a mold or the like can be facilitated. When forming two or more protrusions on one surface, it is necessary to forcibly withdraw the molded product from the mold, which causes the elastic member to be deformed.

  The following variations are possible, and one or more variations may be combined with the above-described embodiment.

(Modification 1)
In the embodiment described above, as illustrated in FIG. 3, in the inner peripheral surface of the elastic member 30, the inner peripheral surface of the projecting portion C exposed to the rear from the reference surface 23 of the lens side mount 20 is a first inclined surface. The example which provides 33 and the 2nd inclined surface 32 was demonstrated. Instead of this, one of the first inclined surface 33 and the second inclined surface 32 may be replaced with a curved surface. Further, both of the first inclined surface 33 and the second inclined surface 32 may be replaced with curved surfaces. The curved surface refers to a surface such as the first inclined surface 33 and the second inclined surface 32 in which the amount of change in the inner diameter is not a uniform inclined surface but the amount of change in the inner diameter changes gradually from the front to the rear.

  FIG. 6 is a view for explaining an example of the cross section of the elastic member 30A according to the first modification. 6, the same components as in FIG. 3 are assigned the same reference numerals as in FIG. 3 and the description thereof is omitted. The elastic member 30A has a first curved surface 33A and a third curved surface on the inner peripheral surface of the projecting portion C exposed rearward (rightward in FIG. 6) from the reference surface 23 (FIG. 3) of the lens side mount 20 among the inner peripheral surfaces. And 2 curved surface 32A.

  Of the inner peripheral surface of the projecting portion C, the first curved surface 33A is in the first range on the front side (left in FIG. 6) of the optical axis O direction (FIG. 3), and the second curved surface 32A is in the second range on the rear side. Are provided respectively. In both the first curved surface 33A and the second curved surface 32A, the inner diameters of the protrusions C of the elastic member 30A gradually change largely from the front to the rear. A curved surface having a small change rate of the inner diameter in the optical axis O direction has a small change in the inner diameter, and a curved surface having a large change rate of the inner diameter in the optical axis O direction has a large change in the inner diameter. In the example of FIG. 6, the change rate of the inner diameter of the rear second curved surface 32A is larger than the change rate of the inner diameter of the front side first curved surface 33A.

  The boundary between the first curved surface 33A and the second curved surface 32A (indicated by a point Q in FIG. 6) is the position of the distance W rearward from the reference surface 23 (FIG. 3) of the lens side mount 20. That is, on the inner peripheral surface of the protrusion C, the first curved surface 33A is disposed between the reference surface 23 of the lens side mount 20 and the distance W, and the second curved surface 32A is disposed behind the distance W.

The reason for arranging the first curved surface 33A and the second curved surface 32A having different rates of change of the inner diameter at the position of the distance W is that the interchangeable lens 3 is mounted on a camera body (not shown) as in the above embodiment. In this case, the protrusion C of the elastic member 30A is prevented from being caught in the joint between the interchangeable lens 3 and the camera body.
The rear side of the second curved surface 32A is connected to the rear end 31. Moreover, the point by which the inclined surface 34 is provided in the outer peripheral surface of the protrusion part C is the same as that of the said embodiment (FIG. 3).

(Modification 2)
In the above embodiment, as an example of the protrusion provided on the inner peripheral surface of the annular elastic member 30, the protrusion 36 protruding inward in the radial direction is provided at the front end in the optical axis O direction. Instead of providing the protrusion 36 at the front end, in the second modification, the protrusion 36 is provided at a position moved rearward from the front end in the optical axis O direction. However, the protrusion 36 moved in position is configured to be hooked on the lens side mount 20.
In addition, the projecting portion 36 may not necessarily be formed annularly on the inner circumferential surface of the elastic member 30, and a portion may be omitted (for example, having a cut portion) along the inner periphery of the elastic member 30. The good point is the same as the above embodiment.

According to the configuration of the second modification, the projecting portion 36 is formed on the inner peripheral surface of the elastic member 30 so that the elastic member 30 is pulled backward in a state where the lens side mount 20 is fixed to the fixed cylinder 15 Also, the protrusion 36 is caught on the lens side mount 20. As a result, it is possible to prevent the elastic member 30 from coming off backward and coming off the interchangeable lens 3.
Also in the configuration of the second modification, since only one protrusion 36 is provided on the inner peripheral surface of the elastic member 30, for example, the die-cutting operation at the time of molding the elastic member 30 using a mold or the like is facilitated. can do.

(Modification 3)
In the embodiment described above, the interchangeable lens 3 has been described as an example, but the present invention may be applied to an accessory other than the interchangeable lens 3 and including the elastic member 30 or the elastic member 30A. The accessory may be, for example, a teleconverter, a wide converter, or a close-up ring which is mounted between the camera body and the interchangeable lens 3 and changes the focal length of the interchangeable lens 3.

  Also, the accessory may be a mount adapter that aligns the mounting standard and enables mounting when the above-described mounting standard between the interchangeable lens 3 and the camera body is different. In that case, the body side mount 120, the body side claw portion 125 and the like correspond to the accessory side mount and the accessory side claw portion of the accessory, respectively.

  Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments considered within the scope of the technical idea of the present invention are also included within the scope of the present invention.

3 ... Interchangeable lens 20 ... Lens side mount 22, 122 ... Fitting portion 23, 123 ... Reference surface 24 ... Cylindrical portion 25 ... Lens side claw portion 30, 30A ... Elastic member 31 ... Rear end 32 ... Second inclined surface 32A ... Second curved surface 33: first inclined surface 33A: first curved surface 35, 36, C: projecting portion 120: body side mount 125: body side claw portion 126: outer peripheral surface O: optical axis

Claims (10)

An interchangeable lens mounted on the camera body,
A lens side mount fitted with a body side mount of the camera body;
An elastic member provided on an outer peripheral side of the lens side mount, and capable of contacting an outer peripheral surface of the body side mount when the interchangeable lens is mounted on the camera body, and radially deformable of the lens side mount;
Equipped with
The elastic member has a protrusion which protrudes toward the camera body from the lens side mount in a state where the interchangeable lens is mounted on the camera body.
The interchangeable lens has a cylindrical shape centered on the optical axis of the interchangeable lens, and the inner diameter of the protrusion is larger as the amount of protrusion from the lens side mount is larger. In the interchangeable lens according to claim 1,
The interchangeable lens, wherein the elastic member has a shape in which the outer diameter is smaller as the amount of protrusion from the lens side mount is larger. In the interchangeable lens according to claim 1 or 2,
The first range of the inner circumferential surface of the protrusion is one of a spherical surface and a flat surface,
The second range of the inner circumferential surface of the protrusion is constituted by the other of a spherical surface and a flat surface,
The interchangeable lens in which the first range and the second range are arranged in a direction along the optical axis. In the interchangeable lens according to claim 1 or 2,
The first range of the inner circumferential surface of the protrusion is a spherical surface or a flat surface,
The second range of the inner peripheral surface of the projecting portion is a spherical surface having a change rate of the inner diameter of the inner peripheral surface different from the spherical surface of the first range, or the flat surface of the first range has an inclination angle to the optical axis Composed of different planes,
The interchangeable lens in which the first range and the second range are arranged in a direction along the optical axis. In the interchangeable lens according to claim 4,
The second range is disposed at a position where the amount of protrusion from the lens side mount is larger than the first range,
The change rate of the inner diameter of the second range is greater than the change rate of the inner diameter of the first range, or
The tilt angle of the second range is larger than the tilt angle of the first range. In the interchangeable lens according to any one of claims 3 to 5,
The lens side mount includes a lens side fitting portion in which an inner peripheral surface and an outer peripheral surface of a body side fitting portion of the body side mount are fitted,
An interchangeable lens in which a boundary between the first range and the second range substantially coincides with an end of a fitting region between the lens side fitting portion and the body side fitting portion in the direction along the optical axis. . The interchangeable lens according to any one of claims 1 to 6.
A cylindrical body provided on an outer periphery of the elastic member and forming a part of a lens barrel;
The replacement member according to claim 1, wherein the elastic member has a first protrusion protruding outward in the radial direction on an outer peripheral surface, and the first protrusion is in contact with an inner peripheral surface of the cylindrical body. In the interchangeable lens according to claim 7,
The interchangeable lens in which the first protrusion of the elastic member is provided at a substantially central portion in a direction along the optical axis. The interchangeable lens according to any one of claims 1 to 8.
The elastic member has a second protrusion projecting inward in the radial direction at the other end opposite to the protrusion.
An interchangeable lens having an inner diameter of the second protrusion smaller than an outer diameter of the lens side mount. In the interchangeable lens according to claim 9,
The second projection is annular around the optical axis,
The interchangeable lens in which the inner circumferential surface of the elastic member is substantially L-shaped in the direction along the optical axis.

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