JP2001183563A - Lens barrel for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel for camera which is provided with a barrier in front of the lens barrel and capable of easily maintaining photographic lens performance. SOLUTION: As for the lens barrel for the camera which is provided with a rotary barrel which is moved while rotating in a direction parallel to an optical axis with reference to a fixed barrel which is fixed to the camera main body, a linear guiding member which is integrally held by the rotary barrel and which is linearly moved in a direction parallel to the optical axis, a movable barrel which is linearly moved in a direction parallel to the optical axis in accordance with the rotation of the rotary barrel, a leading end lens frame for holding a lens group positioned at the leading end, the barrier which is arranged ahead of the leading end lens frame so as to be opened/closed, and a barrier driving mechanism which is driven by the linear guiding member and also which is engaged with the barrier so as to drive the barrier, the leading end lens frame and the barrier driving mechanism are independently attached to the movable barrel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a camera lens barrel having a barrier in front of the camera lens barrel, and
The present invention relates to a camera lens barrel that blocks harmful light in the camera lens barrel.

[0002]

2. Description of the Related Art Heretofore, there has been known a lens barrel in which a barrier is provided in front of a lens barrel of a camera, and is opened when taking a picture and closed when not taking a picture. A conventional example of such a lens barrel will be described with reference to FIG. FIG. 6 is a sectional view of a lens barrel of a conventional camera.

A fixed body 21 is integrally fixed to the camera body and has a female helicoid 21a on the inner periphery. The female helicoid 21a has a rectilinear guide member 3 which will be described later.
2, a guide groove (not shown) is provided parallel to the optical axis.

Reference numeral 31 denotes a rotating cylinder, and the rotating cylinder 31 moves while rotating in a direction parallel to the optical axis with respect to a fixed body 21 fixed to the camera body. The rotary cylinder 31 has a male helicoid 31b screwed with the female helicoid 21a and a large gear 31e integrally formed on the outer circumference, and a female helicoid 31a and a cam groove 31c on the inner circumference. Also,
The rear end has a rib 31d inward.

Reference numeral 32 denotes a linear guide member. The linear guide member 32 has a projection (not shown) which engages with a guide groove (not shown) provided in the fixed barrel 21 in parallel with the optical axis, and is integrally held by the rotary cylinder 31. Upper part 32a formed in a direction parallel to the optical axis
And the lower arm 32c, and moves straight in a direction parallel to the optical axis.

Reference numeral 92 denotes a moving body (also referred to as a front body). The moving body 92 has a male helicoid 92b screwed with the female helicoid 31a on the outer periphery, and a rear moving body (also referred to as a middle body) to be described later inside. ) 94 to form a convex guide portion 92c that engages with the guide groove 94d. The moving barrel 92 moves straight in a direction parallel to the optical axis by the rotation of the rotary barrel 31. Further, a distal end lens frame 93 described below is attached to the moving barrel 92 with a screw 93e.

[0007] Tip lens frame (also referred to as first lens frame) 9
3 holds the first lens group 42 located at the front end. The barrier drive mechanism 100 is attached to the top lens frame 93 by screws 71a.

[0008] The barrier drive mechanism 100 includes a front lens frame 9.
3 is a mechanism for opening and closing the barrier 83. By driving the drive lever member 100a, the rotating ring is rotated to open and close a barrier 83 of the barrier unit 200 described later.

[0009] The barrier unit 200 includes the front lens frame 9.
3 and a barrier 83 that opens and closes, and the barrier unit 200 is fixed to the front body 92 by screws (not shown).

As described above, the barrier 83 and the front lens frame 93 are arranged in order from the subject side in the direction parallel to the optical axis, and the barrier drive mechanism 100 is arranged above the front lens frame 93. .

Reference numeral 94 denotes a rear moving body, which is a rear moving body 94.
Has a second lens frame 53 holding a second lens group 52. The rear moving body 94 moves straight in a direction parallel to the optical axis by a guide groove 94e engaged with the upper arm 32a and the lower arm 32c. The guide groove 94e provided in the lower portion of the rear moving body 94 is not provided up to the front of the rear moving body 94, and the tip of the lower arm 32c is not engaged. Further, the rear moving body 94 has a cam pin 94c that engages with the cam groove 31c, and a straight guide portion 94 that guides the convex guide portion 92c of the front body 92.
d, and a long hole 94g that penetrates to fix the rear body 61 having the third lens group 62.

Reference numeral 61 denotes a rear body, and the rear body 61 holds a third lens group 62. A screw 64 is inserted into the collar 61a, and the rear barrel 61 is screwed to the moving barrel 92.

In the above-mentioned lens barrel, when the barrier drive mechanism 100 is attached to the first lens frame 93 holding the first lens group 42, when the force by the linear guide member is applied to the barrier drive mechanism, There is a problem that the one lens frame 93 is deformed to give a distortion to the first lens group 43 and shift the optical position at the time of assembly.

Further, in the configuration in which the barrier driving mechanism 100 is disposed above the first lens frame 93, the shape of the first lens frame 93 is complicated in order to prevent harmful light.
There is a space limitation for securing the moving amount of the rear moving body, and it is difficult to sufficiently shield light. Further, there is a problem that dirt, dust, and the like easily enter the lens barrel.

Further, the lower arm portion 32c of the linear guide member 32
Is not covered by the rear moving body 94, so that there is a problem that the harmful light 98 easily passes through the gap between the guide groove 94e and the lower arm 32c to reach the lens image plane.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a lens barrel of a camera to which a barrier drive mechanism is attached, which does not adversely affect the optical position accuracy of the first lens group. The first purpose is to do so.

It is a second object of the present invention to provide a camera lens barrel that blocks harmful light entering the rear of the camera lens barrel and prevents dust from entering.

A third object of the present invention is to provide a lens barrel of a camera that blocks harmful light entering from a gap between a guide groove of the rearward moving barrel and a straight guide member.

[0019]

The above first object can be achieved by the following means. That is, a rotating barrel that moves while rotating in a direction parallel to the optical axis with respect to a fixed barrel fixed to the camera body, and a linear guide that is integrally held by the rotating barrel and moves straight in a direction parallel to the optical axis. A member, a moving barrel that moves straight in a direction parallel to the optical axis by rotation of the rotary cylinder, a tip lens frame that holds a lens group located at the tip, and a barrier that is disposed in front of the tip lens frame and opens and closes. And a barrier drive mechanism driven by the linear guide member and engaged with the barrier to drive the barrier, wherein the tip lens frame and the barrier drive mechanism are independent of each other. And a lens barrel of the camera attached to the moving barrel.

The second object can be achieved by the following means. That is, a rotating barrel that moves while rotating in a direction parallel to the optical axis with respect to a fixed barrel fixed to the camera body, and a linear guide that is integrally held by the rotating barrel and moves straight in a direction parallel to the optical axis. A member, a moving barrel that moves straight in a direction parallel to the optical axis by rotation of the rotary cylinder, a tip lens frame that holds a lens group located at the tip, and a barrier that is disposed in front of the tip lens frame and opens and closes. A barrier drive mechanism driven by the linear guide member and engaged with the barrier to drive the barrier, wherein the barrier and the tip lens are arranged in the direction parallel to the optical axis in order from the subject side. A lens barrel for a camera, comprising a frame and the barrier drive mechanism.

The above third object can be achieved by the following means. That is, a rotating cylinder that moves while rotating in a direction parallel to the optical axis with respect to a fixed body fixed to the camera body, and an arm that is integrally held by the rotating cylinder and extends in a direction parallel to the optical axis. A linear movement guide member that has a linear movement in a direction parallel to the optical axis, a movable body positioned at a distal end that linearly moves in a direction parallel to the optical axis by rotation of the rotary cylinder, and engages with the arm. The guide groove moves linearly in a direction parallel to the optical axis, and a rear moving body located behind the moving body, so as to cover the arm portion in a lens barrel of a camera including:
A lens barrel for a camera, wherein a projection is formed on a front side of the rear moving barrel.

[0022]

FIG. 1 shows an embodiment of the present invention.
5 will be described in detail with reference to FIG. 1 is a cross-sectional view showing a configuration of a lens barrel in a barrier closed state, FIG. 2 is a cross-sectional view showing a main part lens barrel configuration in a barrier open state, and FIG. 3 is an exploded perspective view showing a configuration of a barrier drive mechanism and a barrier unit. FIG. 4A is a side view showing a barrier drive mechanism in a barrier open state, FIG. 4B is a top view thereof, and FIG. 5A is a side view showing a main part barrier drive mechanism in a barrier closed state. FIG. 5B is a top view thereof. Members that are mechanically the same as those in the conventional example shown in FIG.

First, the members constituting the lens barrel of the camera will be described with reference to FIGS.

In FIG. 1, reference numeral 21 denotes a fixed body fixed integrally with the camera body 11, and has a female helicoid 21a on the inner periphery. Reference numeral 31 denotes a rotating cylinder, and the rotating cylinder 31
A male helicoid 31b screwed with the female helicoid 21a and a large gear 31e are integrally formed on the outer circumference, and a female helicoid 31a and a cam groove 31c are formed on the inner circumference.

Reference numeral 32 denotes a straight guide member, and the straight guide member 32 has a projection 32d (see FIG. 3) engaged with a guide groove (not shown) provided in the fixed barrel 21 in parallel with the optical axis. Also,
The straight guide member 32 has an upper arm portion 32a and a lower arm portion 32c, and engages with the guide grooves 51e of the middle body 51, respectively.
1 is guided straight in a direction parallel to the optical axis.

Reference numeral 41 denotes a front body. A male helicoid 41b screwed with the female helicoid 31a is provided on the outer periphery of the front body 41, and a convex guide portion 41c which engages with a middle body 51 described later is provided inside. is there. Also, as shown in FIG.
a through the hole 71d of the main plate 71 and the screw hole 41 of the front trunk 41.
The barrier drive mechanism 70 is fixed to the front trunk 41 while being fixed to the position d. Further, the screw 43 c is connected to the hole 43 of the first lens frame 43.
e, the lens frame 43 is fixed to the screw hole 41 e of the front body 41, and the lens frame 43 is attached to the front body 41. The first lens frame 43 is independently fixed to the front body 41 so as not to be affected by an external force or the like from the barrier drive mechanism 70.

As shown in FIG. 3, the first lens frame 43 holds the first lens group 42 on the inside, and the shielding portion 43 on the outside.
b is provided on the entire circumference in a direction perpendicular to the optical axis to prevent harmful light from entering backward and to prevent dust from entering. In addition, a barrier driving mechanism 70 described later is arranged behind the first lens frame 43 so that the shielding portion 43b can be formed. The first lens frame 43 is provided with a hole 43a through which a drive lever member 76 described later penetrates, and the both ends 43d and 43c of the hole 43a are used to drive the drive lever member 7 described later.
6 is regulated (see FIG. 4).

Reference numeral 51 denotes a middle body. The middle body 51 fixes a second lens frame 53 holding a second lens group 52. The middle body 51 has a protruding portion 51a projecting forward and downward to cover the tip of the lower arm portion 32c of the rectilinear guide member 32, and harmful light enters through a gap between the guide groove 51e and the lower arm portion 32c to form a lens. The configuration does not reach the image plane. A shutter 54 is attached to the body 51 with a screw (not shown).

Numeral 70 denotes a barrier drive mechanism. As shown in FIG. 3, the barrier drive mechanism 70 is disposed behind the first lens frame 43 and engages with the barrier 83 to drive the barrier 83. The barrier drive mechanism 70 is attached to the front trunk 41 by screws 71a.

Reference numeral 80 denotes a barrier unit. As shown in FIG. 3, the barrier unit 80 is a unit including a base plate 81, a barrier 83, a rotating ring 85, and the like.

As described above, the barrier 83, the first lens frame 43, and the barrier drive mechanism 70 are arranged in the direction parallel to the optical axis Z in this order from the object side.

The barrier drive mechanism 70 and the barrier unit 80 will be described in more detail with reference to FIG. 3. The ground plate 71 is a ground plate serving as a substrate. Bearing 74, spring 73,
The drive lever member 76 and the drive lever member 75 are overlapped in this order, and are attached to the main plate 71 by a shaft 72. The drive lever member 76 and the drive lever member 75 are rotatable by bearings 74, and the drive lever member 76 has an arm portion 76 a for driving a rotating ring 85 described later and a spring hook portion 76 b of a spring 73. The drive lever member 75 has a pin 75a acting on the cam portion 32b of the rectilinear guide member 32, a spring hook portion 75c of the spring 73, and
8 has a tip portion 75b that engages with the projection engaging portion 78a.

The spring 73 is a torsion coil spring and has two bent portions 73a. The bent portion 73a is arranged with the spring hook portions 76b and 75c sandwiched therebetween.

Further, the holding member 78 and the spring 79 are
The shaft 77 is inserted and attached to the hole 71c. The holding member 78 is rotatably attached by engaging with the shaft 77,
The drive lever member 75 includes a projection engagement portion 78a that locks the distal end portion 75b of the drive lever member 75, and an engagement portion 78b that contacts the cam portion 32b formed at the distal end of the upper arm portion 32a. The spring 79 is a torsion coil spring.
1, the other end is hung on the holding member 78 to urge the holding member.

Next, the barrier unit 80 is fixed to the front body 41 with screws (not shown). The barrier unit 80 is disposed behind the front surface in the order of the base plate 81, the barrier 83, and the rotating ring 85, and the base plate 81 has pins 82 erected,
The barrier 83 opens and closes the lens, and has a long hole 83a and a hole 83b. The rotation ring 85 is a ring-shaped member, and has a hole 85 on which the arm portion 76a of the drive lever member 76 acts.
a and a pin 84 that engages with the elongated hole 83a of the barrier.

Here, with respect to the lens barrel configured as described above, the main operation from the retracted state of the lens barrel to shooting will be described with reference to FIGS. 1 to 5.

This lens barrel is a three-unit zoom lens in which a plurality of zooming regions for zooming and a focusing region for focusing are provided alternately and continuously, and the first lens unit 42 and the third lens unit The lens group 62 moves integrally, and the second lens group 52 moves independently.

When a motor (not shown) is rotated, its driving force rotates the rotary cylinder 31 via the large gear 31e.
The rotary cylinder 31 is moved forward in a direction parallel to the optical axis Z.

A guide fixing plate 3 is provided on the rib 31d of the rotary cylinder 31.
4, the linear guide member 32 is integrally mounted. However, the linear guide member 32 is prevented from rotating by a guide groove (not shown) parallel to the optical axis provided on the fixed body 21 and is restricted only in a direction parallel to the optical axis Z. Moving. Similarly, the rotation of the inner trunk 51 is prevented by a guide groove 51e formed in the straight guide member 32 and engaged with the upper arm 32a and the lower arm 32c. Further, since the convex guide portion 41c provided on the front body 41 and the straight-moving guide portion 51d of the middle body 51 are engaged with each other, the front body 41 is
1 and rotation is blocked. When the rotating cylinder 31 rotates, the front body 41 also advances only in a direction parallel to the optical axis.
The middle body 51 is cam-coupled to the cam groove 31c of the rotary cylinder 31, and is guided straight forward based on the cam groove 31c.

When the rotary cylinder 31 is rotated to move the front body 41 forward, the barrier drive mechanism 7 fixed to the front body 41
0 also moves forward. The upper arm 32a of the straight guide member 32 also moves forward of the lens barrel. Since the amount of movement of the barrier drive mechanism is greater than the amount of movement of the upper arm 32a with respect to the movement of the rotary cylinder 31, the barrier drive mechanism 70 is
It moves in the direction away from a. As shown in FIG. 4, a pin 75 a erected on the drive lever member 75 is
b, and rotates counterclockwise in FIG. 4B. Then, by the rotation of the drive lever member 75, the drive lever member 76 also rotates in the same direction via the spring 73, and the arm portion 76a of the drive lever member 76 drives the rotation ring 85. When the rotation ring 85 rotates, as shown in FIG.
To rotate the barrier 83 around the axis 82,
3 is open. As shown in FIG. 4B, the arm 76a of the drive lever member 76 is connected to the hole 43 of the first lens frame 43.
The operation is restricted at the side end 43c of the motor and stops.

On the other hand, as shown in FIG. 4, when the arm 32a moves, the engaging portion 78b which has been in contact with the tip of the arm 32a
Also moves, the projection 75b is locked to the projection engaging portion 78a,
Even if the pin 75a is disengaged from the cam portion 32b, the barrier 83 remains open.

Here, at the time of photographing, the harmful light 98 that has entered from the front of the lens barrel tries to enter the lower part of the middle barrel 51, but is blocked by the projection 51a, and the guide groove 51e and the lower arm 32c And reaches the lens image plane. In addition, harmful light entering from other than the first lens group 43 entering from the front surface of the lens barrel is blocked by the shielding portion 43b provided on the first lens frame, and is prevented from reaching the lens image plane.

Next, the closing action of the barrier when the lens barrel is retracted after photographing will be described. When the rotary cylinder 31 is moved backward, the barrier drive mechanism 70 fixed to the front barrel 41 moves backward. I do. At the same time, the straight guide member 32
The upper arm 32a also moves backward. Since the amount of movement of the barrier drive mechanism 70 with respect to the movement of the rotary cylinder 31 is greater than the amount of movement of the upper arm 32a, the barrier drive mechanism 70
It will move in the direction approaching 2a. Cam part 32b
5a is rotated clockwise in FIG. 5 (a), and the distal end portion 75b is separated from the projection engaging portion 78a. The drive lever member 75 rotates clockwise in FIG. 5 by the action of the cam portion 32b, and the drive lever member 76 also rotates in the same direction via the spring 73 by the rotation of the drive lever member 75. The arm portion 76a of the drive lever member 76 drives the rotation ring 85, and as shown in FIG. 3, the pin 84 causes the barrier 83 to rotate about the shaft 82 and close the barrier. As shown in FIG. 5B, the operation of the arm portion 76 a of the drive lever member 76 is restricted by the side end 43 d of the hole 43 of the first lens frame 43.

As described above, the barrier driving mechanism 70 and the first
Since the lens frames 43 and the lens frames 43 are independently attached to the front body 41, the performance of the photographing lens can be easily maintained.

Further, since the barrier 83, the first lens frame 43, and the barrier drive mechanism 70 are arranged in the direction parallel to the optical axis in order from the object side, the design of the first lens frame 43 and the barrier drive mechanism is not limited. The arrangement does not interfere. Barrier drive mechanism 70
Can be easily made into a unit, and the first lens frame 43 can be provided with the shielding portion 43b, so that harmful light can be prevented and entry of dust can be prevented. Furthermore, in front of the middle trunk 51,
Since the projection 51a for covering the tip of the arm 32c is provided,
Harmful light can be easily blocked.

Although the embodiment has been described with reference to a three-unit zoom lens type lens barrel, the present invention is not limited to this. For example, a two-unit zoom lens having a first lens unit and a second lens unit may be used. It is possible. In that case, the first lens group is held on the front body 41, and the second lens group is
It is held by the member corresponding to 1.

In the above embodiments, the zoom lens type lens barrel has been described. However, the present invention can be applied to a barrier of a camera having a single focal length lens. In that case, the straight guide member 32 is fixed to the camera body.

In the embodiment, the protrusion 51a formed on the middle body is provided below the middle body 51. However, the present invention is not limited to this. For example, the protrusions may be formed on the left and right sides of the middle body 51. You may.

Further, in the embodiment, the shutter 54 is attached to the middle body 51 with a screw (not shown). However, the present invention is not limited to this. For example, the shutter 54 may be pressed into the middle body 51.

The first lens frame 43 described in the above embodiment.
Is equivalent to the front lens frame described in the claims, the front barrel 41 of the embodiment is equivalent to the moving barrel described in the claims, and the middle barrel 51 of the embodiment is described in claims. This corresponds to the rear moving cylinder described in the range.

[0051]

According to the structure described above, the following effects can be obtained.

According to the first aspect of the present invention, since the front lens frame and the barrier drive mechanism are independently attached to the movable barrel, the performance of the lens group held by the front lens frame is controlled by the barrier drive mechanism. Be less affected.

According to the second aspect of the present invention, the barrier, the front lens frame, and the barrier drive mechanism are arranged in the direction parallel to the optical axis in order from the object side, so that the harmful light is rearward. Intrusion can be prevented, and entry of dust can be prevented.

According to the third aspect of the present invention, since the front lens frame holds the lens group inside the movable barrel and makes the outer peripheral wall close to the inner peripheral wall of the movable barrel, the harmful light is surely prevented. It is possible to prevent entry into the rear and to prevent entry of dust.

According to the fourth aspect of the present invention, the front lens frame and the barrier drive mechanism are independently attached to the movable barrel, so that in addition to the effect of the second embodiment, the movable lens barrel is held by the front lens frame. The performance of the lens group is less affected by the barrier drive mechanism.

According to the fifth aspect of the present invention, the barrier drive mechanism is integrally held by the rotating cylinder, and is formed in the direction parallel to the optical axis formed on the rectilinear guide member which moves straight in the direction parallel to the optical axis. , The barrier drive mechanism can be easily driven using the arm.

According to the sixth aspect of the present invention, the operation of the drive lever member is restricted by both ends of the hole provided in the front lens frame, which is easy to have a positional relationship with the barrier. Can be done more accurately than with

According to the seventh aspect of the present invention, since the projecting portion covering the distal end of the arm portion is formed so as to project toward the front side of the rear moving body, it enters through the gap between the rear moving body and the straight guide member. Harmful light can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a lens barrel in a barrier closed state.

FIG. 2 is a cross-sectional view illustrating a configuration of a main part of a lens barrel in a barrier-open state.

FIG. 3 is an exploded perspective view showing a configuration of a barrier drive mechanism and a barrier unit.

FIG. 4 is a diagram illustrating a barrier drive mechanism in a barrier open state.

FIG. 5 is a diagram showing a barrier drive mechanism in a barrier closed state.

FIG. 6 is a sectional view showing a configuration of a conventional lens barrel.

[Explanation of symbols]

 32 Linear guide member 32c Lower arm part 41 Front trunk 43 First lens frame 43a Hole 43b Shielding part 51 Middle trunk 51a Projection part 70 Barrier drive mechanism 75 Drive lever member 83 Barrier 98 Harmful light

Claims (7)

[Claims] 1. A rotating cylinder that moves while rotating in a direction parallel to an optical axis with respect to a fixed body fixed to a camera body, and is integrally held by the rotating cylinder and linearly moves in a direction parallel to the optical axis. A linear moving guide member, a moving barrel that moves linearly in a direction parallel to the optical axis by the rotation of the rotary barrel, a distal lens frame that holds a lens group located at the distal end, and an open / close disposed in front of the distal lens frame And a barrier driving mechanism driven by the linear guide member and engaged with the barrier to drive the barrier. Are independently attached to the movable barrel. 2. A rotating cylinder that moves while rotating in a direction parallel to an optical axis with respect to a fixed body fixed to a camera body, and is integrally held by the rotating cylinder and linearly moves in a direction parallel to the optical axis. A linear moving guide member, a moving barrel that moves linearly in a direction parallel to the optical axis by the rotation of the rotary barrel, a distal lens frame that holds a lens group located at the distal end, and an open / close disposed in front of the distal lens frame And a barrier drive mechanism driven by the straight guide member and engaged with the barrier to drive the barrier, in a direction parallel to the optical axis, in order from the subject side, the barrier, A lens barrel for a camera, wherein the tip lens frame and the barrier drive mechanism are arranged. 3. The lens barrel according to claim 1, wherein the front lens frame holds the lens group inside the moving barrel, and has an outer peripheral wall close to an inner peripheral wall of the moving barrel. A lens barrel for a camera according to claim 1. 4. The lens barrel of a camera according to claim 2, wherein the distal lens frame and the barrier drive mechanism are independently attached to the movable barrel. 5. The barrier drive mechanism is driven by an arm extending in a direction parallel to the optical axis formed on a rectilinear guide member that is integrally held by the rotary cylinder and that moves straight in a direction parallel to the optical axis. The lens barrel of a camera according to claim 1, 2, 3, or 4, wherein: 6. A drive lever member for driving a rotary ring for opening and closing the barrier is provided in the barrier drive mechanism, and a hole for penetrating the drive lever member is provided in the front lens frame, and operation of the drive lever member is restricted. The lens barrel of a camera according to any one of claims 1 to 5, wherein the step (b) is performed using both side ends of the hole. 7. A rotating cylinder that moves while rotating in a direction parallel to the optical axis with respect to a fixed body fixed to the camera body, and is integrally held by the rotating cylinder and extends in a direction parallel to the optical axis. A straight guide member having an arm portion and moving straight in a direction parallel to the optical axis, a moving body located at a tip that moves straight in a direction parallel to the optical axis by rotation of the rotary cylinder, and the arm portion; In a lens barrel of a camera having a guide member engaged with the guide groove and a rectilinear movement in a direction parallel to the optical axis, and a rear moving body located rearward of the moving body, the arm section is covered. A lens barrel for a camera, wherein a projection is formed on a front side of a rearward moving barrel.