JP2001324659A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize miniaturization by contriving the binding structure of a cylinder member and a disk member. SOLUTION: In this lens barrel having a member constituted by binding the cylinder member 3 and the disk member 2 coaxially with an optical axis by a binding member 4, the member 4 has a holding part 41 holding and binding parts to be held 33 and 26 respectively provided on the members 3 and 2, and the holding part 41 holds the parts to be held 33 and 26 by rotating the member 4 with respect to the members 3 and 2 in a state where it does not hold the parts to be held 33 and 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lens barrel provided in a camera or the like, and more particularly to a lens barrel having a member formed by integrating a cylindrical member and a disk member.

[0002]

2. Description of the Related Art A lens barrel having a straight barrel (cylindrical member) provided in a fixed barrel fixed to a camera body, and moving the straight barrel along the optical axis direction to zoom-drive a photographing lens. It has been known. In such a lens barrel, a disc member is coaxially integrated with the rear end of the rectilinear barrel, and the protrusion provided on the disc member is engaged with the rectilinear groove of the fixed barrel to move the rectilinear barrel in the optical axis direction. There is something that guides you straight. By the way, if the straight-moving barrel and the disk member are integrally formed in advance, there may be a problem in incorporating this into the lens barrel. In such a case, the rectilinear barrel is first assembled into the lens barrel, and then the disk member is attached to the rear end of the rectilinear barrel. It is a target. That is, for example, as shown in FIG. 11, a plurality of bulging portions 103a in which screw holes are formed in advance on the inner peripheral surface of the rear end portion of the rectilinear barrel 103 are formed around the optical axis, and the disc member 102 is connected to the rectilinear barrel 103. After being positioned with respect to the bulging portion 10
Screw into 3a and fasten.

[0003]

SUMMARY OF THE INVENTION As described above, the straight-moving cylinder 1
In the method of fastening the disc member 102 and the disc member 102 with the screw BS, it is necessary to secure a certain length of the bulging portion 103a, which is a threaded portion, in the optical axis direction in order to secure strength by fastening. This leads to an increase in the size of the lens barrel. Specifically, when another cylindrical member or the like is arranged on the inner peripheral surface side of the rectilinear advancing cylinder 103, the bulging portion 103a must be arranged avoiding the optical axis direction.
As the length a becomes longer, the length of the lens barrel in the optical axis direction must be increased. When the bulging portion 103a is formed on the outer peripheral surface of the rectilinear barrel 101, the same problem as described above occurs when another cylindrical member or the like is disposed on the outer peripheral surface side. Further, in the above configuration, there is also a problem that the efficiency of assembly work is low because screws are required at a plurality of locations.

An object of the present invention is to provide a lens barrel which is reduced in size by devising a fastening structure between a cylindrical member and a disk member.

[0005]

According to an embodiment of the present invention, a cylindrical member 3 and a disk member 2 are fastened coaxially to an optical axis by a fastening member 4. The present invention is applied to a lens barrel having a member composed of: The fastening member 4 has a holding portion 41 for holding and fastening the held portions 33 and 26 provided on the cylindrical member 3 and the disk member 2, respectively. The holding portion 41 connects the held portions 33 and 26 to each other.
By rotating the fastening member 4 with respect to the cylindrical member 3 and the disk member 2 in a state where it is not clamped, the clamping portion 41 is configured to clamp the clamped portions 33 and 26, thereby solving the above problem. According to the second aspect of the present invention, the fastening member 4 is formed of a plate-shaped member that is coaxially rotated with the cylindrical member 3 and the disk member 2, and is configured to be rotated in a state of being substantially in surface contact with the disk member 2. Things. According to the third aspect of the present invention, a deformation mechanism 22 for deforming the fastening member 4 with the rotation of the fastening member 4 is provided on the disk member 2, and the holding portion 41 causes the holding portions 33, 26 to be elastically generated by the deformation. Are clamped and fastened. According to a fourth aspect of the present invention, the disk member 2 has a rectilinear guide portion 21 which engages with the rectilinear guide portion 12 formed on the predetermined member 1 to guide the cylindrical member 3 rectilinearly in the optical axis direction. The invention of claim 5 is configured such that the fastening is released by rotating the fastening member 4 in a direction opposite to the direction at the time of fastening. According to a sixth aspect of the present invention, an inner cylindrical member 8 which is movable in the optical axis direction with respect to the cylindrical member 3 is disposed inside the cylindrical member 3 and the outer member is externally inserted into the cylindrical member 3 to which the disk member 2 is fastened. The cylindrical member 1 is the above-mentioned predetermined member. The invention according to claim 7 is characterized in that the fixed cylinder 1, the first rectilinear cylinder 3 movable in the optical axis direction via the rectilinear guide 12 provided on the fixed cylinder 1, and the second cylinder provided inside the first rectilinear cylinder 3. It has a second straight barrel 8, a protrusion 21 provided at one end of the first straight barrel 3 and engaged with the straight guide 12, and a limiting part for preventing the second straight barrel 8 from falling out of the first straight barrel. The present invention is applied to a lens barrel including the disk member 2. And, a fastening member 4 for clamping and fastening the disc member 2 and the first rectilinear barrel 3 is provided, and an inclined portion 22 inclined with respect to the disc surface of the disc member 2 is provided on the disc surface. Is slid by the inclined portion 22 to elastically deform the fastening member 4, thereby obtaining a fastening force for clamping. Claim 8
The present invention is applied to a lens barrel having a member formed by fastening a cylindrical member 203 and a disk member 202 coaxially with an optical axis by a fastening member 204. Then, by rotating the fastening member 204 with respect to the cylindrical member 203 and the disk member 202, the disk member 202 is clamped and fastened between a part 203a of the cylindrical member 203 and the fastening member 204, This solves the above problem. According to the ninth aspect of the present invention, the inner cylindrical member 8 that is movable in the optical axis direction is disposed inside the cylindrical member 203, and the outer cylindrical member 203 is engaged with the rectilinear guide portion 21 formed on the disk member 202. The outer cylindrical member 1 having the rectilinear guide portion 12 for guiding the cylindrical member 203 in the optical axis direction is provided.

[0006] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments are used to make the present invention easier to understand. However, the present invention is not limited to this.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 to 3 are cross-sectional views of a lens barrel (zoom lens barrel) of the camera according to the present embodiment. FIG. 1 shows a stored state (imaging impossible state), FIG. 2 shows a wide-angle end state, and FIG. The telephoto end state is shown. The fixed cylinder 1 fixed to the camera body has a helicoid 1
1 and a straight guide groove 12 extending parallel to the optical axis. The first rotary cylinder 5 provided inside the fixed cylinder 1 has a helicoid 51 that meshes with the helicoid 11 of the fixed cylinder 1, and receives a rotational driving force from a motor (not shown) to engage the helicoids 11, 51. It moves in the optical axis direction while rotating with respect to 1.

A first rectilinear cylinder 3 is provided inside the rotary cylinder 5, and a projection 31 provided on the outer peripheral surface thereof engages with a circumferential groove 52 provided on the inner peripheral surface of the rotary cylinder 5. I have.
By this engagement, the first rectilinear barrel 3 can rotate with respect to the rotary barrel 5 but cannot move in the optical axis direction. First
The rectilinear guide plate 2 is integrally fixed to the rectilinear tube 3, and a rectilinear guide portion 21 (see FIG. 6) provided on the rectilinear guide plate 2 is engaged with the rectilinear guide groove 12 of the fixed tube 1. Therefore, when the rotary barrel 5 rotates, the straight guide plate 2 guides the first straight barrel 3 in the optical axis direction without rotating the first straight barrel 3 with respect to the fixed barrel 1. The rectilinear guide plate 2 also functions as a stopper for preventing a later-described second rectilinear barrel 8 from dropping to the camera rear side. The rectilinear guide plate 2 and the first rectilinear barrel 3 are fastened and integrated by the fastening member 4 during the process of assembling them into the lens barrel. The details of the fastening structure will be described later.

A second rotary cylinder 6 is provided inside the first rectilinear cylinder 3, and a helicoid 61 formed on the outer peripheral surface of the second rotary cylinder 6 is a first rotary cylinder 6.
It meshes with a helicoid 32 formed on the inner peripheral surface of the rectilinear cylinder 3. A pin 62 projecting from the outer peripheral surface of the second rotary cylinder 6 is engaged with a groove 53 in the optical axis direction of the first rotary cylinder 5. When the first rotary cylinder 5 rotates, the groove 53 and the pin 62
, The second rotary cylinder 6 rotates, and the helicoids 61 and 32
The second rotary cylinder 6 moves in the optical axis direction with respect to the first rectilinear cylinder 3 by the action of.

A first lens unit L is provided inside the second rotary cylinder 6.
1 is provided, and the helicoid 71 formed on the outer peripheral surface of the third rectilinear cylinder 7 is the helicoid 6 of the second rotary cylinder 6.
3 is engaged. On the inner peripheral surface of the third rectilinear barrel 7, a rectilinear guide portion 72 that is rectilinearly guided by the second rectilinear barrel 8 is formed. The protrusion 81 formed on the outer peripheral surface of the second rectilinear cylinder 8 is engaged with the circumferential groove 66 formed on the inner peripheral surface of the second rotary cylinder 6. Rotation with respect to the rotary cylinder 6 is possible, but it is impossible to move in the optical axis direction. In addition, the straight guide portion 82 formed on the outer peripheral surface of the second straight barrel 8 is engaged with the straight guide groove 34 of the first straight barrel 3, whereby the second straight barrel 8 rotates with respect to the first straight barrel 3. It is possible to move in the optical axis direction without performing.

A second lens group holding frame 9 provided inside the second rectilinear barrel 8 holds the second lens group L2 and a cam pin 91 which engages with the cam groove 64 of the second rotary barrel 6.
have. Similarly, the third lens group holding frame 10 provided inside the second rectilinear barrel 8 holds the third lens group L3 and has a cam pin 101 that engages with the cam groove 65 of the second rotary barrel 6. I have. When the second rotary cylinder 6 rotates,
By the action of the cam pin 91 and the cam groove 64 and the action of the cam pin 101 and the cam groove 65, the second and third lens group holding frames 9, 1 are formed.
0 move in the optical axis direction with respect to the second rotary cylinder 6.

The fastening structure between the straight guide plate 2 and the first straight barrel 3 will be described in detail. As shown in FIG. 4, the fastening member 4 for integrally fastening the two members is formed of a substantially annular plate member. A protrusion 42 is formed at a position corresponding to the claw 41. On the other hand, as shown in FIG.
On the outer peripheral surface of the first rectilinear barrel 3, ridges 33 to be clamped by the claw portions 41 are formed at three locations (only one location is shown), and the ends of each ridge 33 facilitate the clamping by the claw portions 41. Inclined surface 33a is formed.

The rectilinear guide plate 2 has a substantially annular shape as shown in FIG. 6, and has rectilinear guide portions 21 formed at two locations on its outer peripheral portion to be engaged with the rectilinear guide grooves 12 of the fixed cylinder 1. In addition, escape portions (notches) 25 for escaping the claw portions 41 of the fastening member 4 are formed at three places. Also,
The clamped portion 26 clamped by each claw portion 41 of the fastening member 4
And a stopper 27 that restricts rotation of the fastening member 4 by contact with the claw 41 is provided corresponding to each relief 25. On the other hand, the rear surface of the straight guide plate 2 (the surface on the camera body side)
Are provided with three projections 22 for deforming the protrusion 42 of the fastening member 4, and are provided with positioning projections 23 to be engaged with the holes 43 of the fastening member 4. The projections 22 and 23 are formed with slopes 22a and 23a that are inclined with respect to the surface (disc surface) of the fastening member 4, respectively. 28 is a straight guide portion 82 of the second straight barrel 8.
Holes for accommodating (see FIG. 2).

Next, a procedure for fastening the linear guide plate 2 to the first linear cylinder 3 will be described. 7 and 8 are views of the relationship between the rectilinear guide plate 2, the first rectilinear cylinder 3, and the fastening member 4 as viewed from the camera rear side (from the direction A in FIG. 1). FIG. FIG. 8 shows the state after fastening. In the first straight barrel 3, only the ridge 33 is shown by a broken line. It is structurally difficult to assemble the first rectilinear barrel 3 and the rectilinear guide plate 2 into the lens barrel in a state where they are integrated in advance. Therefore, the first rectilinear barrel 3 and other members are all incorporated into the lens barrel. After that, the rectilinear guide plate 2 is fastened to the first rectilinear cylinder 3. First, the rectilinear guide plate 2 is positioned and arranged with respect to the first rectilinear cylinder 3 such that the clamped portions 26 overlap the respective ridges 33 of the first rectilinear cylinder 3, and then the claw portions 41
The fastening member 4 is superimposed on the straight guide plate 2 so that the position is located at the escape portion 25 (FIG. 7). At this time, the fastening member 4 is in surface contact with the rectilinear guide plate 2, and the protrusion 42 and the protrusion 2
2 and the hole 43 are not engaged with the projection 23.

When the fastening member 4 is rotated in the counterclockwise direction (direction B) in FIG. 7 in this state, the claw portion 41 moves in the same direction to pinch the ridge 33 and the held portion 26. Since the fastening member 4 only needs to be rotated while being in surface contact with the rectilinear guide plate 2, the position of the claw portion 41 in the optical axis direction does not shift. In addition, there is no inconvenience that the tip of the claw 41 slides on the slope 33 a of the ridge 33, so that the claw 41 is caught by the ridge 33 and is prevented from moving.

When the fastening member 4 rotates to some extent, the claw 4
1 is formed on the inner peripheral surface side of the linear guide plate 2
Of the hole 43 slides on the slope 22a, and the peripheral portion of the hole 43
Riding while sliding a. The protruding portion 42 is elastically deformed toward the camera rear side as shown in FIG. 9 by riding on the protrusion 22, and the side surface of the claw portion 41 abuts the stopper portion 27 of the rectilinear guide plate 2 in a state where the amount of deformation is maximum. The rotation of the fastening member 4 is prevented (FIG. 8). 9 is applied to the tip of the claw 41 by the elastic deformation of the protrusion 42, and the ridge 33 and the pinched portion 26 are moved by the claw 41 by the force.
, And the first rectilinear barrel 3 and the rectilinear guide plate 2 are fastened. Further, the hole 43 of the fastening member 4 is engaged with the positioning projection 23 of the rectilinear guide plate 2, thereby preventing the fastening member 4 from rotating in the direction opposite to the direction B. At this time, the axes of the straight guide plate 2, the first straight barrel 3 and the fastening member 4 coincide with the optical axis.

On the other hand, when it is necessary to separate the first rectilinear barrel 3 and the rectilinear guide plate 2 due to replacement of parts, the fastening member 4 is partially lifted from the rectilinear guide plate 2 and the hole 43 is formed.
By disengaging the engagement with the projection 23 and rotating the fastening member 4 in the direction opposite to the direction B, the fastening is released.

As described above, in the present embodiment, the first linear barrel 3 and a part of the linear guide plate 2 (the ridge 33 and the clamped portion 26) are clamped by the claw portions 41 provided on the fastening member 4 so that , The length of the ridge 33 in the optical axis direction is increased by the bulging portion 103a (FIG. 1) in the conventional screw fastening method.
It can be much shorter than 1). Conventional bulging portion 103a
Is formed on the inner or outer peripheral surface of the cylindrical member,
In any case, since the length in the optical axis direction is long, one of the members disposed on the inner peripheral surface side and the outer peripheral surface side of the cylindrical member has a large light-positioning position to avoid the bulging portion. Must be shifted forward in the axis. On the other hand, in the case of the present embodiment, since the length of the ridge 33 formed on the outer peripheral surface side of the first straight cylinder 3 in the optical axis direction is short, the first rotary cylinder 5 located on the outer peripheral surface side is disposed in the same position. It is only necessary to shift the position very slightly forward of the optical axis, and the length of the lens barrel in the optical axis direction can be shortened as compared with the related art. Further, the radial thickness of the ridge 33 can be made smaller than that of the conventional bulging portion, and the effect of reducing the diameter of the lens barrel can be obtained.

Further, since the fastening and unfastening can be performed by rotating the fastening member 4 by a predetermined angle, assembling work efficiency is higher than in the case where a plurality of locations are fastened with screws, and replacement of the straight guide plate 2 is extremely easy. Can be done. In particular, in the present embodiment, the fastening member 4 is formed in a plate shape, and is fastened in a state in which the fastening member 4 comes into surface contact with the rectilinear guide plate 2, so that the arrangement space of the fastening member 4 is very small, and the lens barrel becomes large. Never. Furthermore, since a part of the fastening member 4 is elastically deformed and the fastening force is increased by the elastic force, sufficient rigidity can be ensured similarly to the screw fastening system.

Here, in the second rectilinear barrel 8 disposed on the inner peripheral surface side of the first rectilinear barrel 3, the rectilinear guide portion 82 is integrally formed in advance, but this may cause inconvenience in assembly. Absent. As described above, in the present embodiment, the cylindrical member and the linear guide portion are separated from the outer cylindrical member (the first linear cylinder 3), which is difficult to assemble when the linear guide portion is integrally formed, and these are formed at the time of assembly. It is integrated. In particular, the effect obtained by forming the rectilinear guide plate 2 separately from the first rectilinear cylinder 3 disposed immediately inside the fixed cylinder 1 and configuring the fastening structure as described above is significant.

Hereinafter, the zooming operation of the lens barrel will be described. When the zoom motor (not shown) is driven when the lens barrel is in the housed state shown in FIG. 2, a rotational driving force is transmitted to the first rotary cylinder 5, and the first rotary cylinder 5
Due to the action of 51, it is fed forward (leftward in the figure) along the optical axis while rotating with respect to the fixed cylinder 1, that is, the camera body. Along with this, the first rectilinear cylinder 3 and the rectilinear guide plate 2 integrated by the fastening member 4 are fed out integrally with the first rotary cylinder 5. The rectilinear guide portion 21 of the rectilinear guide plate 2 is engaged with the rectilinear guide groove 12 of the fixed cylinder 1, and the first rectilinear cylinder 3 is rotatable with respect to the first rotary cylinder 5. Straight barrel 3
The straight guide plate 2 is fed out without rotating with respect to the fixed cylinder 1.

The rotation of the first rotary cylinder 5 transmits a rotational force to the second rotary cylinder 6 through the groove 53 and the pin 62, and the second rotary cylinder 6 is moved by the helicoids 61 and 32 to the first linear cylinder. 3 and is fed out in the optical axis direction while rotating. The second straight barrel 8 is rotatable with respect to the second rotary barrel 6 by engagement of the projection 81 with the groove 66 and is integral in the optical axis direction. The straight guide part 82 is straightened by the straight guide groove 34. Since it is guided, it is fed out in the optical axis direction without rotating with respect to the first rectilinear barrel 3 integrally with the second rotary barrel 6.

Since the third rectilinear cylinder 7 is guided straight by the second rectilinear cylinder 8, when the second rotary cylinder 6 rotates, it does not rotate with respect to the second rectilinear cylinder 8 by the action of the helicoids 63, 71. It is fed out in the optical axis direction with respect to the second rotary cylinder 6. The extension of the third rectilinear barrel 7 causes the first lens unit L
1 moves. The rotation of the second rotary cylinder 6 causes the cam pin 91 and the cam groove 64 and the cam pin 101 and the cam groove 65 to rotate.
, The second and third lens group holding frames 9 and 10 move in the optical axis direction with respect to the second rotary cylinder 6, respectively, and the second and third lens groups L2 and L3 move. Then, when the wide-angle state shown in FIG. 2 is reached, the zoom motor is stopped, and the camera is ready for shooting. By operating a zoom button (not shown), the lens barrel can be extended / retracted between the wide-angle end state and the telephoto end state (FIG. 3) by the same operation as described above or the reverse operation. Further, when the main switch is turned off, the state is retracted to the stored state.

In the above embodiment, the first rectilinear barrel 3 is a cylindrical member, the rectilinear guide plate 2 is a disc member, the ridge 33 is a pinched portion, the claw 41 is a pinched portion, and the projection 22 is a deformation mechanism. The second straight barrel 8 constitutes an inner cylindrical member, and the fixed barrel 1 constitutes an outer cylindrical member.

FIG. 10 shows another embodiment, which is the same as the previous embodiment except that the fastening structure between the first rectilinear barrel 203 and the rectilinear guide plate 202 is different. A projection 203a and a male screw portion 203b are formed on the outer peripheral surface of the rear end of the first rectilinear barrel 203, while a female screw portion 2 is formed on the inner peripheral surface of the fastening member 204.
04a is formed. Further, it is assumed that the rectilinear guide plate 202 is formed with a rectilinear guide portion 21 which is engaged with the rectilinear guide groove 12 of the fixed cylinder 1 described above. In this embodiment, by screwing the fastening member 204 into the male screw portion 203b, the annular linear guide plate 202 is sandwiched and fixed between the projection 203a and the fastening member 204.
This also makes it easy to fasten and release the straight guide plate 202.

The protrusion 203a may be formed over the entire outer peripheral surface of the first rectilinear barrel 203, or may be formed at a plurality of portions. Further, in the above two embodiments, the example in which the disc member is the straight guide plate is described, but a member that plays a role other than the straight guide may be used.

[0027]

According to the first aspect of the invention, when the cylindrical member and the disk member are fastened coaxially with the optical axis by the fastening member,
Since the clamping member is provided with a clamping portion, and the clamping member is rotated with respect to the cylindrical member and the disk member in a state where the clamping portion does not clamp the clamped portion, the clamping portion clamps the clamped portion. The length of the portion to be fastened of the cylindrical member in the optical axis direction and the thickness in the radial direction can be made smaller than in the case of fastening with screws, so that the lens barrel can be downsized and the efficiency of fastening work can be improved. If the fastening member is constituted by a plate-shaped member that is rotated coaxially with the cylindrical member and the disc member, and this is brought into substantially surface contact with the disc member, the arrangement space of the fastening member can be a very narrow space, Enlargement of the lens barrel can be prevented. If a deformation mechanism for deforming the fastening member with the rotation of the fastening member is provided on the disk member, and the holding portion is configured to hold and hold the held portion by elastic force generated by the deformation, a high fastening force is obtained, Unwanted detachment of the disk member can be prevented. If the fastening member is configured to be released by rotating the fastening member in a direction opposite to the direction at the time of fastening, the cylindrical member and the disc member can be easily separated from each other, and the work efficiency at the time of component replacement can be improved. According to the invention of claim 7, there is provided a fastening member for sandwiching and fastening the disc member and the first rectilinear cylinder, and the fastening member is slid by the inclined portion of the disc member to be elastically deformed, thereby holding the disc member. Since the fastening force is obtained, the portion to be fastened of the first rectilinear barrel can be made smaller as compared with the case of fastening with screws, as described above, so that the lens barrel can be downsized and a high fastening force due to elasticity can be obtained. Thus, undesired detachment of the disk member can be prevented. According to the invention of claim 8, since the disk member is sandwiched and fastened between a part of the cylindrical member and the fastening member by rotating the fastening member with respect to the cylindrical member and the disk member, As described above, the efficiency of the fastening operation can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a stored state of a lens barrel according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a wide-angle end state of the lens barrel.

FIG. 3 is a sectional view showing a telephoto end state of the lens barrel.

FIG. 4 is a perspective view showing a configuration of a fastening member.

FIG. 5 is a perspective view showing a configuration of a first rectilinear cylinder (cylindrical member).

FIG. 6 is a perspective view showing the configuration of a straight guide plate (disk member).

FIG. 7 is a view for explaining a procedure for fastening the first straight advancing cylinder and the straight advancing guide plate, and shows a state before fastening.

FIG. 8 is a view similar to FIG. 7, showing a state after fastening.

FIG. 9 is an enlarged view showing a part of FIG. 1;

FIG. 10 is a sectional view showing a fastening structure of a lens barrel according to another embodiment.

FIG. 11 is a cross-sectional view showing a conventional lens barrel fastening structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed cylinder 2 Straight guide plate 3 First straight cylinder 4 Fastening member 8 Second straight cylinder 12 Straight guide groove 21 Straight guide section 22 Projection 23 Positioning projection 25 Relief section 26 Interposed section 27 Stopper section 33 Protrusion section 41 Claw section 42 Projection

Claims (9)

[Claims] 1. A lens barrel including a member formed by fastening a cylindrical member and a disk member coaxially with an optical axis by a fastening member, wherein the fastening members are provided on the cylindrical member and the disk member, respectively. A clamping portion for clamping and clamping the clamped portion, and rotating the fastening member with respect to the cylindrical member and the disk member in a state where the clamping portion does not clamp the clamped portion, A lens barrel, wherein a holding portion is configured to hold the held portion. 2. The fastening member comprises a plate-shaped member which is coaxially rotated with the cylindrical member and the disk member,
3. The lens barrel according to claim 2, wherein the lens barrel is rotated in a state of being substantially in surface contact with the disk member. 3. A deforming mechanism for deforming the fastening member in accordance with rotation of the fastening member is provided on the disk member, and the holding portion holds and holds the held portion by an elastic force generated by the deformation. 2. A structure according to claim 1, wherein
Or the lens barrel according to 2. 4. A disk drive according to claim 1, wherein said disc member has a rectilinear guide portion which engages with a rectilinear guide portion formed on a predetermined member and guides said cylindrical member rectilinearly in the optical axis direction. Item 4. The lens barrel according to any one of Items 1 to 3. 5. The lens barrel according to claim 1, wherein the fastening is released by rotating the fastening member in a direction opposite to the direction of the fastening. 6. An inner cylindrical member movable in the optical axis direction with respect to the cylindrical member, wherein the predetermined member is externally inserted into the cylindrical member to which the disk member is fastened. The lens barrel according to claim 4, wherein the lens barrel is an outer cylindrical member. 7. A fixed barrel, a first straight barrel movable in the optical axis direction via a straight guide provided on the fixed barrel, a second straight barrel provided inside the first straight barrel, A projection provided on one end of the first rectilinear barrel and engaged with the rectilinear guide; and a disc member having a restricting section for preventing the second rectilinear barrel from coming out of the first rectilinear barrel. A lens barrel, comprising: a fastening member that sandwiches and fastens the disc member and the first rectilinear barrel; and an inclined portion that is inclined with respect to the disc surface of the disc member is provided on the disc surface; A lens barrel, wherein the fastening member is slid by the inclined portion to elastically deform the fastening member to obtain a fastening force for the clamping. 8. A lens barrel having a member formed by fastening a cylindrical member and a disk member coaxially with an optical axis by a fastening member, wherein the fastening member is rotated with respect to the cylindrical member and the disk member. A lens barrel characterized in that the disc member is sandwiched and fastened between a part of the cylindrical member and the fastening member. 9. An inner cylindrical member movable in the optical axis direction with respect to the cylindrical member is disposed within the cylindrical member, and a linear guide formed on the disk member is provided outside the cylindrical member. 9. The lens barrel according to claim 8, further comprising an outer cylindrical member having a rectilinear guide portion that guides the cylindrical member in the optical axis direction by engaging with the portion.