JP2008052219A - Optical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical instrument wherein frictional force between an elastic body and a member on the other side is changed due to the shape difference in the elastic member, thereby having improved operation feeling. <P>SOLUTION: The optical instrument (1) includes: a first member (20); a second member (10) disposed so that it can move relatively to the first member; optical systems (L1, L3 and L4) that are operated with the relative movement of the first member and the second member; and the elastic member (92) disposed in one of the first member and the second member, and also, that can come in contact with the other member, that includes an asymmetrical shape in the relative movement direction in terms of the cross sectional shape thereof along the relative movement direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical apparatus.

A lens barrel that is an optical device is known in which a rubber piece is inserted between a fixing member and an operation member for zoom operation to improve the operational feeling (see, for example, Patent Document 1).
JP-A-8-286090

In this conventional lens barrel, for example, when photographing with the optical axis tilted, a difference occurs in the input amount required when the photographer operates the operation member due to the weight of the lens, etc. There was a possibility of giving the person a sense of incongruity.
An object of the present invention is to provide an optical apparatus with improved operational feeling.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although it attaches | subjects and demonstrates the code | symbol corresponding to drawing which shows embodiment of this invention, it is not limited to this.
The invention of claim 1 includes a first member (20), a second member (10) provided to be movable relative to the first member, the first member, and the second member. The optical system (L1, L3, L4) operated by the relative movement of the first member and the second member is provided on one member and can be brought into contact with the other member. It is an optical apparatus (1) provided with the elastic member (92) by which the cross-sectional shape along a direction contains the shape asymmetrical in the said relative movement direction.

According to a second aspect of the present invention, there is provided the optical apparatus according to the first aspect, wherein the first member (10) is an operation member that is driven in response to an input operation. is there.
According to a third aspect of the present invention, in the optical instrument according to the first or second aspect, the asymmetric cross-sectional shape of the elastic member (92) is a substantially parallelogram. It is.
According to a fourth aspect of the present invention, in the optical device according to any one of the first to third aspects, the elastic member (92) is the first member (10) or the second member (20). The volume of the space provided between the recess and the elastic member is different between the one direction side and the other direction side along the relative movement direction. This is an optical apparatus (1).

According to a fifth aspect of the present invention, there is provided the optical apparatus according to any one of the first to fourth aspects, wherein the first member (20) is a zoom operation unit. ).
Note that the configuration described with reference numerals may be changed as appropriate, or at least a part of the configuration may be replaced with another component.

  As described above, the optical apparatus of the present invention can improve the operability because the frictional force between the elastic body and the other member changes due to the shape difference of the elastic member.

[Embodiment]
Hereinafter, the present invention will be described in more detail with reference to the drawings. In the following embodiments, a lens barrel will be described as an example of an optical apparatus.
FIG. 1 is a cross-sectional view showing a cross section including the optical axis of the lens barrel of the embodiment.
FIG. 2 is a development view of the inner peripheral surface of the cam barrel provided in the lens barrel of FIG.
3 is a cross-sectional view taken along the line III-III in FIG.

The lens barrel 1 is an interchangeable lens barrel that is detachably attached to a camera body (not shown), and has a substantially cylindrical shape as a whole.
The lens barrel 1 includes a first lens group L1, a second lens group L2, a third lens group L3, a fourth lens group L4, a base 10, a zoom operation cylinder 20, a fixed cylinder 30, a cam cylinder 40, and a first group holding. A cylinder 50, a second group holding cylinder 60, a third group holding frame 70, a fourth group holding frame 80, and a resistance applying unit 90 are provided.
The first lens group L1, the second lens group L2, the third lens group L3, and the fourth lens group L4 cooperate to form a zoom lens having a four-group configuration, and the objective side along the optical axis A From the image side to the image side. The second lens unit L2 functions as a focus lens.

  The base 10 is formed in a cylindrical shape from, for example, a synthetic resin material, and the central axis thereof is disposed so as to substantially coincide with the optical axis A. The base portion 10 includes a mount portion 11 at an end on the image side in the optical axis direction, and is detachably attached to the camera body via the mount portion 11. The base 10 is provided with a focusing operation ring 12 at the time of manual focusing, a switch 13 for selecting whether the blur correction unit is activated or not, and the like on the outer peripheral surface thereof.

The zoom operation cylinder 20 is formed, for example, in a cylindrical shape from a synthetic resin material, and an end portion on the optical axis direction image side thereof is connected to an end portion on the optical axis direction objective side of the base portion 10.
Here, in the base portion 10, the outer diameter dimension of the end on the optical axis direction objective side is smaller than the inner diameter dimension of the zoom operation tube 20, and this portion is inserted on the inner diameter side of the zoom operation tube 20.
In the portion where the zoom operation cylinder 20 is inserted into the base 10, a minute gap is provided between the base 10 and the zoom operation cylinder 20 to allow the zoom operation cylinder 20 to slide relative to the base 10. The zoom operation cylinder 20 is rotatable about the optical axis with respect to the base 10.

The lens barrel 1 is configured such that when the focal length of the zoom lens is changed by a photographer or the like, the zoom operation barrel 20 is rotated around the optical axis with respect to the base 10.
When the lens barrel 1 is viewed from the objective side in the optical axis direction, the zoom operation cylinder 20 is rotated, for example, counterclockwise with respect to the base 10 at the time of zoom-up operation. It is rotated in the clockwise direction.
The zoom operation cylinder 20 has a sheet-like rubber wound around its outer peripheral surface. This rubber functions as an anti-slip when the photographer performs a zoom operation.

The fixed cylinder 30 is a cylinder that is inserted on the inner diameter side of the zoom operation cylinder 20 and is fixed to the base portion 10.
The fixed cylinder 30 is provided in each of the rectilinear guide groove 31 into which a cam follower pin 51 provided in a first group holding cylinder 50 described later is inserted, and in the third group holding frame 70 and the fourth group holding frame 80. The linear guide groove 32 into which the cam follower pins 71 and 81 are inserted is provided (see FIG. 2).

The cam cylinder 40 is a cylinder that is inserted into the inner diameter side of the zoom operation cylinder 20 and the outer diameter side of the fixed cylinder 30.
The cam cylinder 40 includes a cam groove 41 into which cam follower pins 51, 71, 81 provided in a first group holding cylinder 50, a third group holding frame 70, and a fourth group holding frame 80 described later are inserted. (See FIG. 2). The shape of the cam groove 41 will be described in detail later.
The cam cylinder 40 is rotated around the optical axis with respect to the base 10 by a lever (not shown) provided on the zoom operation cylinder 20 described above, and the zoom operation cylinder 20 is rotated around the optical axis. In conjunction with this, the base 10 rotates about the optical axis.

The first group holding cylinder 50 is a cylinder inserted between the zoom operation cylinder 20 and the cam cylinder 40. The first group holding cylinder 50 is an end portion on the objective side in the optical axis direction, and the first lens group L1 is fixed to the inner diameter side thereof.
Further, the first group holding cylinder 50 includes a cam follower pin 51 formed to protrude toward the inner diameter side at the end on the image side in the optical axis direction. The cam follower pin 51 passes through the cam groove 41 of the cam cylinder 40 and is inserted into the rectilinear guide groove 31 of the fixed cylinder 30 (see FIG. 2).

The first group holding cylinder 50 includes a lead groove cylinder 52. The lead groove cylinder 52 is a cylinder disposed on the inner diameter side of the fixed cylinder 30, and the end on the optical axis direction objective side is fixed to the end of the first group holding cylinder 50 on the optical axis direction objective side by a bolt 53. Has been. The lead groove cylinder 52 is driven in the optical axis direction in conjunction with the first group holding cylinder 50.
A second group drive cylinder 54 is inserted between the lead groove cylinder 52 and the fixed cylinder 30.
The second group drive cylinder 54 is rotated about the optical axis with respect to the base 10 in response to an input from the focusing operation ring 12 for focusing or by being driven by the actuator 55.

The second group holding cylinder 60 is a cylinder inserted into the inner diameter side of the lead groove cylinder 52. The second lens group L2 is fixed to the end of the second group holding cylinder 60 on the objective side in the optical axis direction.
The second group holding cylinder 60 includes a cam follower pin 61 provided so as to protrude from the outer peripheral surface to the outer diameter side. The cam follower pin 61 passes through a straight guide groove (not shown) formed in the lead groove cylinder 52, and a tip portion thereof is inserted into a cam groove (not shown) formed in the second group drive cylinder 54.
In the lens barrel 1, when the second group driving cylinder 54 is rotated around the optical axis, the second group holding cylinder 60 is driven in the optical axis direction by the cam mechanism, thereby focusing. FIG. 1 shows a state before and after driving the second group holding cylinder 60 in the upper and lower portions with the optical axis A as a boundary.

The third group holding frame 70 is an annular frame that holds the third lens group L3 on its inner diameter side. The third group holding frame 70 includes cam follower pins 71 that are formed so as to protrude from the outer peripheral surface to the outer diameter side. The cam follower pin 71 passes through a rectilinear guide groove 32 (see FIG. 2) formed in the fixed cylinder 30, and a distal end portion thereof is inserted into a cam groove 41 provided in the cam cylinder 40.
The fourth group holding frame 80 is a cylindrical frame that holds the fourth lens group L4 on its inner diameter side. The fourth group holding frame 80 includes a cam follower pin 81 that protrudes from the outer peripheral surface to the outer diameter side. The cam follower pin 81 passes through a rectilinear guide groove 32 (see FIG. 2) formed in the fixed cylinder 30, and a tip portion is inserted into a cam groove 41 provided in the cam cylinder 40.

Next, the cam groove 41 provided in the cam cylinder 40 will be described.
The cam groove 41 includes a first group driving cam groove 42, a third group driving cam groove 43, and a fourth group driving cam groove 44. For example, three sets are provided around the optical axis. Since the three sets of cam grooves 41 have substantially the same cam profile, only one set will be described here.

  The telephoto end of the first group drive cam groove 42 is near the end of the cam barrel 40 on the optical axis direction objective side, and the end of the wide side is near the end of the cam barrel 40 on the optical axis direction image side. Each is arranged. The first group drive cam groove 42 is a linear groove in which the tele-side end and the wide-side end are connected to each other by a substantially linear groove that is inclined with respect to an axis parallel to the optical axis A. It is.

The third group drive cam groove 43 is a curved groove that is curved as a whole. The gradient of the third group drive cam groove 43 is gentler in the wide side region than in the tele side region.
The telephoto end of the third group drive cam groove 43 is disposed closer to the image side in the optical axis direction than the tele end of the first group drive cam groove 42, and the wide end thereof is the first end. The group drive cam groove 42 is disposed closer to the objective side in the optical axis direction than the end on the wide side.
The telephoto end of the fourth group drive cam groove 44 is disposed closer to the optical axis direction image side than the tele end of the third group drive cam groove 43. The position of the wide-side end of the fourth group drive cam groove 44 in the optical axis direction is substantially the same as the position of the wide-side end of the first group drive cam groove 42.

The fourth group drive cam groove 44 includes a non-drive region 44a and a drive region 44b.
The non-drive region 44 a is a groove that includes the wide-side end of the fourth group drive cam groove 44 and is formed substantially parallel to the circumferential direction of the cam cylinder 40. When the cam follower 81 is located in this non-driving region, the fourth group holding frame 80 is not substantially driven in the optical axis direction even when the cam cylinder 40 rotates.
The drive region 44 b is a linear groove that includes the tele end of the fourth group drive cam groove 44 and is inclined with respect to an axis parallel to the optical axis A.
The non-drive region 44a and the drive region 44b are formed continuously, and the boundary portion is in the vicinity of the end of the cam tube 40 on the image side in the optical axis direction, and the first group drive cam groove 42 is formed. It is arrange | positioned in the vicinity of the edge part of the wide side.

In FIGS. 1 and 4, the resistance applying unit 90 is disposed between the zoom operation cylinder 20 in a portion where the zoom operation tube 20 is inserted into the base 10. The resistance applying unit 90 improves the rotational resistance when the photographer rotates the zoom operation cylinder 20 as compared with the case where the resistance applying unit 90 is not provided.
The lens barrel 1 has a larger input amount required when the photographer rotates the zoom operation tube 20 as the rotational resistance increases.
As shown in FIGS. 3 and 4, the resistance applying unit 90 is provided at three locations around the optical axis, for example, 120 ° apart. Since the configuration of these three resistance applying units 90 is substantially the same, one of them will be described below.

FIG. 4 is an enlarged view of a portion IV in FIG. 3 and a cross-sectional view showing a resistance applying portion.
4A shows a cross-sectional view of the rubber piece provided in the resistance applying portion. FIGS. 4B and 4C show the zoom lens from the tele side to the wide side and from the wide side to the tele side, respectively. The state of the resistance applying portion when moving to the side is shown.
The resistance applying unit 90 includes an accommodation unit 91 and a rubber piece 92.
The accommodating portion 91 is a portion formed by denting the outer peripheral surface of the base portion 10. The accommodating portion 91 is formed at the end of the base portion 10 on the optical axis direction objective side and inserted into the inner diameter side of the zoom operation tube 20. The bottom portion 91 a of the housing portion 91 is a plane perpendicular to the radial direction of the base portion 10.

The accommodating part 91 has a substantially rectangular cross-sectional shape perpendicular to the depth direction. The cross section perpendicular to the depth direction of the accommodating portion 91 has a constant dimension in the optical axis direction, whereas the dimension along the circumferential direction of the base portion 10 is from the bottom 91a side to the opening side. It is formed to become gradually larger.
Here, out of the four wall surface portions of the housing portion 91, one of the two opposing wall surface portions orthogonal to the optical axis direction and the wall surface portion orthogonal to this is a plane substantially perpendicular to the bottom portion 91a. ing.
On the other hand, the remaining one wall surface portion is inclined with respect to the bottom portion 91a, and the accommodating portion 91 has a substantially trapezoidal cross-sectional shape in a cross-sectional view orthogonal to the optical axis A ( (Refer FIG.4 (b)). Hereinafter, the surface portion inclined with respect to the bottom portion 91a will be referred to as an inclined surface portion 91b.

Here, the position where the inclined surface portion 91b is formed will be described. Here, for the sake of convenience, the resistance applying portion 90a formed at a position where the housing portion 91 opens upward in the vertical direction when the camera body is set to the normal photographing position will be described. The inclined surface portion 91b is provided on the left wall surface portion of the four wall surface portions of the housing portion 91 when the lens barrel 1 is viewed from the optical axis direction objective side.
The inclined surface portion 91b is similarly provided for the housing portions 91 of the other two resistance applying portions 90, and the lens barrel 1 is positioned in the optical axis direction with the openings of the housing portions 91 facing upward in the vertical direction. It is provided on the left wall when viewed from the side.
The accommodating portion 91 includes a convex portion 93. The convex portion 93 is a substantially columnar protrusion formed by protruding from a substantially central portion of the bottom portion 91 a in the housing portion 91.

The rubber piece 92 is formed of a material capable of elastic deformation such as rubber. The rubber piece 92 is a hexahedron having six flat portions on the surface thereof, and is accommodated in the accommodating portion 91 in a state where the bottom surface portion 92 a faces the bottom portion 91 a of the accommodating portion 91.
The external dimensions of the bottom surface portion 92a of the rubber piece 92 are substantially the same as the dimensions of the bottom portion 91a of the accommodating portion 91. The rubber piece 92 is in the optical axis direction and the base portion 10 in the state accommodated in the accommodating portion 91. Movement in the circumferential direction is limited.
The surface portion of the rubber piece 92 opposite to the bottom surface portion 91a is formed in parallel with the bottom surface portion 92a. Hereinafter, the surface portion opposite to the bottom surface portion 92a is referred to as an upper surface portion 92b, and the surface portions other than the bottom surface portion 92a and the upper surface portion 92b are referred to as side surface portions.

The rubber piece 92 is formed such that the dimension in the direction along the depth direction of the accommodating portion 91 (hereinafter referred to as the height direction of the rubber piece 92) is larger than the depth dimension of the accommodating portion 91. In the accommodated state, the upper surface portion 92 b is in contact with the inner peripheral surface of the zoom operation cylinder 20.
Therefore, when the zoom operation cylinder 20 is rotated with respect to the base 10, the rubber piece 92 is subjected to a shearing force along the circumferential direction of the base 10 due to a frictional force generated between the rubber piece 92 and the zoom operation cylinder 20.

The inclined surface portion 91b provided in the housing portion 91 has a rubber piece 92 by the shearing force when the zoom operation tube 20 is rotated counterclockwise when the lens barrel 1 is viewed from the objective side in the optical axis direction. Is formed on the wall surface in the direction of deformation.
The rubber piece 92 has a substantially parallelogram-shaped cross section as shown in FIG. 4A in a cross section perpendicular to the optical axis A. Hereinafter, among the side surface portions of the rubber piece 92, a set of side surface portions inclined with respect to the bottom surface portion 92a and the top surface portion 92b will be referred to as an inclined surface portion 94.

Of the inclined surface portion 94 of the rubber piece 92, one inclined surface portion 94 a is in contact with the inclined surface portion 91 b of the accommodating portion 91. Further, a space portion 95 is formed between the other inclined surface portion 94b and the wall surface portion of the accommodating portion 91 (see FIG. 4C).
Further, the rubber piece 92 includes a concave portion 96 formed by denting the bottom surface portion 92a of the rubber piece 92. A convex portion 93 provided in the accommodating portion 91 is fitted in the concave portion 96. A gap is formed between the concave portion 96 and the convex portion 93.

Next, the operation at the time of zooming the lens barrel 1 will be described.
A photographer of the camera changes the focal length of the zoom lens provided in the lens barrel 1 by rotating the zoom operation tube 20 around the optical axis with respect to the base 10.
When the zoom operation cylinder 20 rotates, the cam cylinder 40 rotates in conjunction with this. The cam cylinder 40 includes a cam groove 41 and presses the cam follower pins 51, 71 and 81 inserted into the cam groove 41. Since the cam follower pin 51 is inserted into the rectilinear guide groove 31 and the cam follower pins 71 and 81 are inserted into the rectilinear guide groove 32, respectively, the first group holding cylinder 50, the third group holding frame 70, and the fourth group holding Each frame 80 is propelled in the optical axis direction.

Here, when the lens barrel 1 is viewed from the objective side in the optical axis direction, when the zoom lens is driven from the wide side to the tele side (during zoom-up operation), the zoom operation barrel 20 is, for example, counter-rotated around the optical axis. It is rotated clockwise (see FIG. 4C).
The rubber piece 92 is in contact with the inner peripheral surface of the zoom operation cylinder 20, and is generated between the rubber piece 92 and the zoom operation cylinder 20 when the camera user rotates the zoom operation cylinder 20 around the optical axis. A good operational feeling can be obtained by the rotational resistance caused by the frictional force.

Further, the rubber piece 92 is restricted from moving in the optical axis direction and the circumferential direction of the base portion 10 while being accommodated in the accommodating portion 91, and the upper surface portion 92 b is in contact with the zoom operation cylinder 20. . Accordingly, when the zoom operation cylinder 20 rotates around the optical axis, the rubber piece 92 is subjected to a shearing force around the optical axis due to a frictional force generated between them.
Here, the inclined surface portion 91b of the accommodating portion 91 is formed on a surface portion in a direction in which the rubber piece 92 is deformed by the shearing force when the zoom operation cylinder 20 is rotated counterclockwise. Therefore, deformation in the shear direction is limited, and the frictional force between the rubber piece 92 and the zoom operation cylinder 20 is maintained substantially constant.

On the other hand, when the lens barrel 1 is viewed from the objective side in the optical axis direction, the zoom operation cylinder 20 is, for example, around the optical axis when driving the zoom lens from the tele side to the wide side (during zoom-down operation). It is rotated clockwise (see FIG. 4B).
Also in this case, the rubber piece 92 is subjected to a shearing force around the optical axis by a frictional force generated between the rubber piece 92 and the zoom operation cylinder 20.
Since the resistance imparting portion 90 has a space portion 95 formed between the rubber piece 92 and the wall surface portion of the housing portion 91, the rubber piece 92 is deformed by this shearing force.
Further, since the wall surface portion facing the inclined surface portion 91b of the housing portion 91 is substantially perpendicular to the bottom portion 91a of the housing portion 91, the rubber piece 92 whose section perpendicular to the optical axis A is a substantially parallelogram is sheared around the optical axis. When deformed by force, the cross-sectional shape becomes substantially rectangular as shown in FIG. 4B in a cross-sectional view perpendicular to the optical axis A.

Since the rubber piece 92 is deformed in a state in which the volume is substantially constant, the dimension in the height direction is increased when the cross-sectional shape is changed from a substantially parallelogram to a substantially rectangular shape.
When the height dimension of the rubber piece 92 increases, the pressing force with which the rubber piece 92 presses the zoom operation cylinder 20 is improved, and the frictional force between the rubber piece 92 and the zoom operation cylinder 20 is improved.
Thus, the friction force between the zoom operation cylinder 20 and the rubber piece 92 varies depending on the rotation direction around the optical axis. The input amount required when the photographer operates the zoom operation cylinder 20 is larger when performing the zoom-down operation than when performing the zoom-up operation.

As described above, according to the lens barrel 1 of the present embodiment, the following effects can be obtained.
(1) For example, when a photographer photographs a subject obliquely upward, the cam follower pins 51, 71, 81 of the first group holding cylinder 50, the third group holding frame 70, and the fourth group holding frame 80 are The cam cylinder 40 is pressed in the direction in which the zoom lens is zoomed down by its own weight.
Therefore, the input amount required when the photographer operates the zoom operation cylinder 20 at this shooting position is larger when performing the zoom-up operation than when performing the zoom-down operation.
Here, since the resistance applying unit 90 of the lens barrel 1 improves the rotational resistance when the zoom operation tube 20 is zoomed down, the input amount required by the photographer during the zoom up operation and the zoom down operation is set. It can be made uniform. Therefore, the operability of the lens barrel 1 is improved.

(2) Further, the cam groove 41 formed in the cam cylinder 40 includes a non-driving area 44a in the wide side area of the fourth group driving cam groove 44, and the gradient of the third group driving cam groove 43 is wide. In this area, it is looser than the area on the tele side.
Therefore, for example, when the photographer shoots a subject obliquely above, the cam follower pins 71 and 81 are located closer to the tele end of the cam grooves 43 and 44, respectively, compared to the case where they are closer to the wide end. These cam follower pins 71 and 81 improve the pressing force for rotating the cam barrel 40, so that the zoom lens may move to the wide side due to its own weight, that is, a zoom-down operation unintended by the photographer may be performed. To rise.
On the other hand, the lens barrel 1 of the present embodiment improves the rotational resistance of the cam barrel 40 during the zoom-down operation, and thus can prevent unintended movement of the zoom lens to the wide side as described above.
(3) Since a gap is provided between the concave portion 96 of the rubber piece 92 and the convex portion 93 of the housing portion 91, the rubber piece 92 is easily deformed, and thereby the cross-sectional shape of the rubber piece 92 can be reliably deformed. it can.

(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
(1) The optical apparatus of the present invention is a lens barrel in the embodiment, but is not limited thereto, and may be a telescope, binoculars, a microscope, a surveying instrument, or the like. The shape and material of the elastic member are not limited to those described in the embodiment, and can be changed as appropriate.
(2) The configuration of the optical apparatus of the present invention is not limited to that described in the embodiment, and can be changed as appropriate. For example, in the embodiment, the frictional force between the zoom operation cylinder that rotates around the optical axis and the base is improved. However, the present invention is not limited to this, and for example, a resistance applying section is provided between the cam cylinder and the fixed cylinder. May be. Further, the resistance applying unit is not limited to the one that improves the frictional force when operating the rotating member, and may be provided, for example, between a straight cylinder and a fixed cylinder that go straight in the optical axis direction. Furthermore, the operation member is not limited to a member for zoom operation, and may be another operation member such as an operation ring for focusing.
(3) The resistance application unit of the embodiment improves the rotational resistance when the zoom operation tube is rotated from the tele side to the wide side, but conversely, the zoom operation tube is rotated from the wide side to the tele side. At this time, the rotational resistance may be improved.
(4) In the embodiment, the resistance imparting portions are provided at three locations around the optical axis. However, the number of the resistance imparting portions is not limited to this, and may be one or two locations, or four or more locations. There may be.
(5) Although the rubber piece of embodiment was accommodated in the accommodating part, it is not restricted to this, For example, the rubber piece may be directly provided in the outer peripheral surface of the base. Even in this case, the rotational resistance changes according to the rotation direction of the zoom operation cylinder due to the difference in shape of the rubber pieces, so that the operational feeling can be improved.

It is sectional drawing containing the optical axis of the lens-barrel of embodiment. FIG. 2 is a development view of an inner peripheral surface of a cam cylinder provided in the lens barrel of FIG. 1. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1. It is the IV section enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens barrel: 10 Base part: 20 Zoom operation cylinder: 90 Resistance provision part: 91 Storage part: 92 Rubber piece: L1 1st lens group: L2 2nd lens group: L3 3rd lens group: L4 4th lens group

Claims (5)

A first member;
A second member provided to be movable relative to the first member;
An optical system operated by relative movement of the first member and the second member;
The first member and the second member are provided on one member and can contact the other member, and the cross-sectional shape along the relative movement direction includes an asymmetric shape in the relative movement direction. An optical device comprising: an elastic member. The optical instrument according to claim 1,
The first member is
An optical device that is an operation member that is driven in response to an input operation. The optical apparatus according to claim 1 or 2,
The optical device, wherein the asymmetric cross-sectional shape of the elastic member is a substantially parallelogram. In the optical instrument according to any one of claims 1 to 3,
The elastic member is accommodated in a recess provided in the first member or the second member;
An optical apparatus, wherein a volume of a space provided between the concave portion and the elastic member is different between one direction side and the other direction side along the direction of the relative movement. In the optical instrument according to any one of claims 1 to 4,
The optical apparatus, wherein the first member is a zoom operation unit.

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