JPH0821942A - Lens barrel - Google Patents

Abstract

PURPOSE:To easily attach a rotating range controlling member for an operating ring in the case of controlling the rotating range of the operating ring with respect to a fixed barrel. CONSTITUTION:A projection 12f projecting in the radial direction is formed on the external peripheral surface of the operating ring 12 capable of rotating around the optical axis. An annular groove 4f which is recessed in the external peripheral surface direction, which extends in a direction around the optical axis, and to which the projection of the ring 12 is fitted is formed on the internal peripheral surface of the fixed barrel 4 disposed on the external peripheral side of the ring 12, and also through-holes 4p and 4p passing through the groove 4f from the external peripheral surface of the fixed barrel 4 are formed on the fixed lens barrel 4. The rotating range controlling members 21 and 21' formed out of a member having elasticity, just fitted to the through-holes 4p and 4p' of the fixed barrel 4, and reaching inside the groove 4f are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel for moving a lens along an optical axis by rotating an operating ring around the optical axis relative to a fixed barrel.

[0002]

2. Description of the Related Art As a conventional lens barrel, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 5-84907.

In this lens barrel, the operating ring is rotated around the optical axis of the lens with respect to the fixed barrel, and the lens is moved along the optical axis. The operation ring is formed with a protrusion protruding in the radial direction on the outer peripheral surface thereof. Further, on the inner peripheral surface of the fixed cylinder, an annular groove is formed which is recessed in the outer peripheral surface direction thereof, extends in the optical axis rotation direction, and into which the projection of the operation ring can be fitted. Further, the fixed barrel is formed with a notch that penetrates from one end in the direction parallel to the optical axis of the fixed barrel to the annular groove. When the operating ring is incorporated into the fixed barrel, the operating ring is moved relative to the fixed barrel in a direction parallel to the optical axis, and the protrusion of the operating ring is inserted into the annular groove through the notch of the fixed barrel. The fixed cylinder in which the operation ring is incorporated is provided with a rotation range restricting member that restricts a rotation range of the operation ring with respect to the fixed cylinder. The rotation range restricting member is composed of a screw, a metal plate with which the screw portion of the screw is screwed, and a rubber plate that relieves the impact when the screw contacts the protrusion of the operation ring. When the rotation restricting member is provided on the fixed cylinder, the rubber plate and the metal plate are put in the annular groove formed on the inner peripheral side of the fixed cylinder, and the screws are inserted into the fixed cylinder from the outer peripheral side to fix the fixed plate. The rubber plate and the metal plate are fixed in the groove by being screwed into the metal plate in the groove of the cylinder. The rubber plate and the metal plate come into contact with the projections of the operation ring to regulate the rotation range of the operation ring.

[0004]

However, in such a conventional technique, since the rotation range restricting member is composed of three members, the mounting thereof is very troublesome and the manufacturing cost is high. There is a problem.

The present invention has been made by paying attention to such a conventional problem, and the rotation range regulating member can be easily attached to the fixed barrel, and the manufacturing cost can be reduced. The purpose is to provide.

[0006]

To achieve the above object, a lens support frame for supporting a lens, a cylindrical operating ring rotatable around the optical axis of the lens, and an outer peripheral surface of the operating ring are provided. , A rotation range regulating member that regulates a rotation range of the operation ring with respect to the fixed cylinder, and the lens support frame that supports the lens by rotation of the operation ring around the optical axis. A moving mechanism for moving in a direction parallel to the optical axis, the operation ring is formed with a projection protruding in a radial direction on an outer peripheral surface of a portion covered by the fixed cylinder, and the fixed cylinder has the On the inner peripheral surface of the part covering the outer peripheral surface of the operation ring,
The protrusion of the operating ring fits into the outer peripheral surface of the operating ring, extends in the direction around the optical axis, and is slightly larger in both directions than the predetermined range of rotation of the operating ring around the optical axis with respect to the fixed barrel. When the operating ring is moved in the direction parallel to the optical axis relative to the fixed barrel, the protrusion of the operating ring is moved to the fixed barrel. In order to fit in the groove, a notch is formed from the end of the fixed barrel in the direction parallel to the optical axis to one end of the annular groove in the direction around the optical axis, and the projection can be just inserted thereinto. It penetrates from the outer peripheral surface of the cylinder to the annular groove, one end in the direction around the optical axis thereof coincides with one end around the optical axis of the annular groove, and the other end in the direction around the optical axis is the rotation range. A first through hole is formed which coincides with one end of the It penetrates from the outer peripheral surface of the fixed barrel to the annular groove, the other end in the direction around the optical axis coincides with the other end around the optical axis in the annular groove, and the one end in the direction around the optical axis rotates. A second through hole that coincides with the other end of the range is formed, and as the rotation range restricting member, a first rotation range restricting member that fits into the first through hole and the second through hole of the fixed cylinder, respectively, There is a second rotation range restricting member, and each of the rotation range restricting members is formed of one elastic member, and is fitted into the through hole of the fixed cylinder and fits into the annular groove. A flange portion that restricts the radial movement of the fitting portion so that the fitting portion does not come out of the annular groove in a direction approaching the optical axis.

[0007]

When the operating ring is incorporated in the fixed barrel, the operating ring is moved in the direction parallel to the optical axis with respect to the fixed barrel, and the projection of the operating ring is inserted into the annular groove from the notch of the fixed barrel. As a result, the operation ring can be rotated about the optical axis relative to the fixed barrel by the protrusion sliding on the annular groove of the fixed barrel.

After the operating ring is assembled in the fixed barrel, the first rotation range regulating member and the second rotation range regulating member are fitted into the first through hole and the second through hole from the outer peripheral side of the fixed barrel, respectively. When fitting each rotation range regulating member into each through hole,
An adhesive agent is applied to the outer peripheral surface of each rotation range regulating member so that each rotation range regulating member does not come off in the direction away from the central axis (which coincides with the optical axis) of the fixed cylinder. In addition, the flange portion of each rotation range regulating member does not come off in the direction approaching the central axis of the fixed cylinder without applying an adhesive.

By the way, one end of the first through hole in the direction around the optical axis coincides with one end of the annular groove around the optical axis, and the other end in the direction around the optical axis is the rotation range of the operating ring. Match one end. Therefore, in the first rotation restricting member that is just fitted in the first through hole, the other end surface of the first rotation range restricting member in the optical axis rotation direction coincides with one end of the rotation range, and the second rotation range restricting member. One end surface of the member in the direction around the optical axis coincides with the other end of the rotation range. Therefore, the rotation range of the protrusion is the second end surface of the first rotation range regulating member in the direction around the optical axis and the second rotation range regulating member.
The rotation range restriction member is limited to the one end surface in the direction around the optical axis, and is restricted to the target rotation range. Further, since the rotation range restricting member of this embodiment has elasticity, even if the projection of the operation ring comes into contact with this, the impact can be softened.

As described above, according to the present invention, since the rotation range restricting member is formed of one member having elasticity, the mounting of the rotating range restricting member to the fixed cylinder is simply performed by fitting it into the through hole of the fixed cylinder. This installation work can be greatly simplified because it only needs to be inserted. Moreover, since the number of parts is reduced, it is possible to reduce the manufacturing cost. Further, in the present invention, a notch is formed so as to be connected to one end of the annular groove, and after the protrusion is inserted from the notch into the annular groove, the first rotation range is provided at one end of the annular groove having the notch. Since the restriction member is provided, the protrusion of the operation ring does not reach the notched portion, and the operation ring does not come off from the fixed cylinder.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A lens barrel according to an embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the lens barrel of this embodiment includes a front lens group 2 and a rear lens group 3.
Are moved along the optical axis 6 to perform zooming, and to focus manually and automatically.

This lens barrel has a cylindrical fixed barrel 4 mounted so as not to rotate and move relative to the camera body, and a front lens group support frame 13 for supporting the front lens group 2.
A rear lens group support frame 8 for supporting the rear lens group 3, a cylindrical zoom operation ring 11 rotatably arranged around the optical axis, and spiral cam grooves 5a, 5b around the optical axis. A zoom cam ring 5 that is formed and rotates around the optical axis as the zoom operation ring 11 rotates, and a cam groove 5 of the zoom cam ring 5.
The cam pins 9 and 10 which are fitted in the a and 5b and whose end portions are fixed to the lens support frame 8 and the like, and the front group lens support frame 13 together with the front group lens 2 on the optical axis 6 by rotating around the optical axis. The focusing operation ring 12 is moved along with the focusing operation ring 12, and the rotation range restricting members 21 and 21 ′ that restrict the rotation range of the focusing operation ring 12 are configured.

The fixed barrel 4 has an inner peripheral side cylindrical portion 4B and an outer peripheral side cylindrical portion 4A having an optical axis 6 as a central axis, and is integrally formed with each other. A protrusion 4a for attaching to the camera body is provided on the camera body side of the inner peripheral side cylindrical portion 4B.
Are formed. Further, the inner peripheral side cylindrical portion 4B is formed with rectilinear grooves 4b and 4c penetrating from the outer peripheral side to the inner peripheral side and extending in a direction parallel to the optical axis 6. At the subject side end of the outer peripheral side cylindrical portion 4A, annular grooves 4f, 4f 'which are recessed in the outer peripheral side direction on the inner peripheral surface and extend in the optical axis rotation direction.
Is formed, and the annular groove 4 is formed from the end on the subject side.
Notches 4h and 4i are formed to connect up to f and 4f '. Furthermore, on the camera body side of the outer peripheral side cylindrical portion 4A, an annular through hole 4j penetrating from the outer peripheral side to the inner peripheral side and extending in the optical axis rotation direction is formed.

The zoom operating ring 11 includes a zoom operating ring main body 11A which is rotatably arranged around the optical axis on the outer peripheral side of the outer peripheral side cylindrical portion 4A of the fixed barrel 4, and an optical axis from the inner peripheral surface of the main body 11A. And an arm portion 11B extending in a direction approaching. This arm portion 11B corresponds to the fixed cylinder 4 described above.
Through the annular through hole 4j of the outer peripheral side cylindrical portion 4A of the fixed cylinder 4
Between the outer peripheral side cylindrical portion 4A and the inner peripheral side cylindrical portion 4B.

The cam ring 5 is a cylindrical portion 4B on the inner peripheral side of the fixed barrel 4.
Is arranged on the outer peripheral side of the so as to be rotatable around the optical axis. At the end 5c of the cam ring 5 on the camera body side, the zoom operation ring 1
The end portion of the first arm portion 11B is fitted. Therefore, when the zoom operation ring 11 is rotated, the cam ring 5 rotates around the optical axis along with this rotation. The cam grooves 5a and 5b formed in the cam ring 5 are the front lens group 5a.
And 5b for the rear lens group. Further, the rectilinear grooves 4b and 4c formed on the inner peripheral side cylindrical portion 4B of the fixed barrel 4 also have a front lens group 4b and a rear lens group 4c. A cam pin 9 for the front lens group is inserted into the cam groove 5a for the front lens group and the rectilinear groove 4b for the front lens group, and the inner end of the cam pin 9 is embedded in a front lens group screw ring 7 described later. A rear group lens cam pin 5 is inserted into the rear group lens cam groove 5b and the rear group lens rectilinear groove 4c, and the inner end of the cam pin 10 is embedded in the rear lens support frame 8.

The focusing operation ring 12 has a cylindrical operation portion 12A positioned on the object side of the outer peripheral side cylindrical portion 4A with an outer diameter substantially the same as the outer diameter of the outer peripheral side cylindrical portion 4A of the fixed barrel 4, and the outer periphery. An outer diameter slightly smaller than the inner diameter of the side cylindrical portion 4A, and a cylindrical operated portion 12B that is inserted between the outer peripheral side cylindrical portion 4A and the inner peripheral side cylindrical portion 4B, and are integrally formed with each other. It is configured. The cylindrical operation portion 12A has a straight-moving recess 12b formed on the inner peripheral surface thereof so as to be recessed in the outer peripheral direction and extend in a direction parallel to the optical axis 6. In addition, the cylindrical operated portion 12
B is an annular groove 4 formed on an outer peripheral side cylindrical portion 4A of the fixed barrel 4 projecting in the radial direction on the outer peripheral surface of the subject side.
Protrusions 12f and 12f 'that fit into f and 4f' are formed, and inner teeth 12c extending around the optical axis are formed on the inner peripheral surface of the camera body side. The inner teeth 12c are engaged with the pinions 14 arranged on the outer peripheral side cylindrical portion 4A and the inner peripheral side cylindrical portion 4B of the fixed barrel 4, and the focusing operation ring 12 is rotated by rotating the pinion 14. Can be rotated around the optical axis. In addition, this pinion 14
It is rotated by a motor (not shown).

The front lens group supporting frame 13 has a cylindrical lens supporting portion 13A for supporting the front lens group 2 and a cylindrical operating ring connecting portion 13B located on the outer peripheral side thereof.
They are formed integrally with each other. Lens support 1
On the outer peripheral surface of 3A, a spiral male screw 13a is formed around the optical axis. On the inner peripheral surface of the above-mentioned front group lens screw ring 7, a female screw 7a which is spirally fitted around the optical axis and is screwed to the male screw 13a is formed. The operation ring connecting portion 13B is formed with a projection 13b which projects in the radial direction and is fitted into the rectilinear recess 12b of the focusing operation ring 12.

As shown in FIG. 3, the rotation range restricting members 21, 21 'are formed of one member having elasticity, and the annular groove 4f is formed from the outer peripheral side of the fixed cylinder 4 to the inner peripheral surface thereof.
The fitting portions 21a, 2 penetrating into the annular groove 4f and blocking a part of the annular groove 4f.
1a 'and the fitting portions 21a, 21a' do not come out from the annular groove 4f in the direction approaching the optical axis.
21b, 21 for restricting the radial movement of the
b '. Rotation range regulating member 2 having elasticity
1, 21 'are specifically formed of rubber. In the present embodiment, a moving mechanism that moves the front lens group support frame 13 in the direction parallel to the optical axis 6 by rotating the focusing operation ring 12 around the optical axis is formed in the focusing operation ring 12. The straight-moving concave portion 12b and the projection 1 of the front lens group supporting frame 13
3b and the front lens group screwing ring 7 with which the front lens group supporting frame 13 is screwed.

Here, the annular grooves 4f, 4f 'of the fixed barrel 4,
The relationship between the projections 12f and 12f ′ of the focusing operation ring 12 fitted in the annular grooves 4f and 4f ′ and the rotation range regulating members 21 and 21 ′ that regulate the rotation range θ of the focusing operation ring 12 will be described in detail. To do. Protrusions 12f, 1 of the focusing operation ring 12
As shown in FIG. 2, there are two 2f 'at positions symmetrical to each other about the optical axis. In addition, the annular groove 4f of the fixed cylinder 4,
4f ′ also includes two protrusions 12f, 12 of the focusing operation ring 12.
There are two so that f'can be fitted respectively. One of the annular grooves 4f and 4f 'has a formation region in the direction around the optical axis that is slightly larger in both directions than the predetermined rotation range θ of the focusing operation ring 12. That is, the fitting portions 21 of the rotation range restricting members 21, 21 'are respectively provided at both ends of the annular groove 4f in the optical axis direction.
When the a and 21a 'are embedded, the annular groove 4f is formed so that the mutual widths of the end faces 21c and 21c' of the respective rotation range restricting members 21 and 21 'coincide with the rotation range θ of the focusing operation ring 12. ing. These rotation range regulating members 2
In order to fit 1, 2 ′ into the fixed cylinder 4, the fixed cylinder 4 is formed with a first through hole 4p and a second through hole 4p ′ that penetrate the outer peripheral surface of the fixed cylinder 4 into the annular groove 4f. . First
One end surface of the through hole 4p in the optical axis rotation direction coincides with _one end 4f _{1 of the} annular groove 4f around the optical axis, and the other end surface in the optical axis rotation direction has one end θ of the rotation range θ. The second through hole 4p 'is formed so as to correspond to ₁ ,
The other end face in the direction around the optical axis coincides with the other end 4f ₂ around the optical axis in the annular groove 4f, and the one end face in the direction around the optical axis coincides with the other end θ ₂ in the rotation range θ. Has been formed. Each through hole 4 is formed on the outer peripheral surface of the fixed cylinder 4.
The rotation range restriction members 21 and 2 are provided around p and 4p '.
Flange recesses 4q and 4q 'in which the 1'flange portions 21b and 21b are housed are formed. The flange recesses 4q and 4q 'are formed in the through-holes 4p and 4p in the direction around the optical axis.
It extends in the direction in which the annular groove 4f is not formed with 4p 'as the center. That is, the flange recesses 4q, 4
q'is not formed on the outer peripheral surface of the portion where the annular groove 4f is formed. This is in the direction around the optical axis,
If the positions of the annular groove 4f and the flange recesses 4q and 4q 'are aligned, the radial thickness of the fixed cylinder 4 is increased so that the recesses are not connected to each other when forming the recesses from the inner peripheral side and the outer peripheral side. It is necessary to do so. Therefore, the flange portion 21 of the rotation range restricting member 21, 21 '
The b and 21b 'extend only in one direction around the fitting portions 21a and 21'. The cutout 4h formed in the fixed barrel 4 extends from the subject side end of the fixed barrel 4 in a direction parallel to the optical axis 6 and is connected to _one end 4f ₁ of the annular groove 4f in the optical axis rotation direction. And the projection 12 of the operating ring 12
It is formed so that f can enter exactly.

Similarly to the one annular groove 4f, the other annular groove 4f 'has a formation region in the direction around the optical axis which is slightly smaller than the predetermined rotation range θ of the focusing ring 12 in both directions. Is getting bigger. Also with respect to this annular groove 4f ′, it extends from the subject side end of the fixed barrel 4 in a direction parallel to the optical axis, and one end 4 of this annular groove 4f ′ in the optical axis rotation direction.
A notch 4i connected to f ₁ 'is formed. In addition,
The rotation range restricting members 21 and 21 'are not provided for the projection 12f' that fits in the annular groove 4f '. This is because the rotation range θ of the focusing operation ring 12 with respect to the fixed barrel 4 can be restricted only by providing the rotation range restriction members 21 and 21 ′ with respect to the projection 12f fitted in the one annular groove 4f. .

When incorporating the operating ring 12 into the fixed barrel 4,
The operating ring 12 is moved in a direction parallel to the optical axis with respect to the fixed barrel 4, and the protrusions 12f and 12f 'of the operating ring 12 are inserted into the annular grooves 4f and 4f' from the notches 4h and 4i of the fixed barrel 4. .
As a result, the focusing operation ring 12 has its projections 12f, 12
By sliding f'in the annular grooves 4f, 4f 'of the fixed barrel 4, it is possible to rotate relatively to the fixed barrel 4 around the optical axis.

In this way, after the operation ring 12 is assembled in the fixed barrel 4, the first rotation range regulating member 21 and the second rotation range regulating member 21 'are respectively placed in the first through hole 4p and the second through hole 4p'. Fit in. Each rotation range regulation member 21,2
When fitting 1'into each through hole 4p, 4p ', each rotation range regulating member 21, 21' is prevented from coming off in a direction away from the central axis of the fixed barrel 4 (which coincides with the optical axis). An adhesive is applied to the outer peripheral surface of each rotation range regulating member 21, 21 '. Note that the respective rotation range regulating members 21, 21 'cannot be pulled out in the direction approaching the central axis of the fixed barrel 4 by the flange portions 21b, 21b' without applying an adhesive.
As described above, the other end surface 21c of the first rotation range restriction member 21 coincides with _one end θ ₁ of the rotation range θ, and the one end surface 21c ′ of the second rotation range restriction member 21 ′ has the rotation range θ. Since it coincides with the other end θ ₂ , the rotation range of the projection 12f is restricted to the target rotation range θ by these two rotation range restriction members 21 and 21 ′. Further, since the rotation range regulating members 21 and 21 'of this embodiment have elasticity, even if the projection 12f of the operation ring 12 comes into contact with this, the impact can be softened.

As described above, in this embodiment, since the rotation range restricting members 21 and 21 'are formed of one member having elasticity, the mounting of the rotating range restricting members 21 and 21' on the fixed cylinder 4 is simply performed.
Since this need only be fitted into the through holes 4p and 4p 'of the fixed cylinder 4, this mounting work can be greatly simplified. Moreover, since the number of parts is reduced, it is possible to reduce the manufacturing cost.

By the way, the photographer may move the focusing operation ring 12 relative to the fixed barrel 4 in a direction parallel to the optical axis 6 while operating the focusing operation ring 12. At this time, the projections 12f and 12f ′ of the focusing operation ring 12 are notched 4
When located at the ends of the annular grooves 4f and 4f ′ having h and 4i, the focusing operation ring 12 is disengaged from the fixed barrel 4.
Therefore, in this embodiment, the notch 4h is formed so as to be connected to the end 4f ₁ of the annular groove 4f, and the rotation range restricting member 21 is arranged at the end 4f ₁ of the annular groove 4f having the notch 4h. The projection 12f of the operation ring 12 is prevented from reaching the portion having the notch 4h.

Next, the operation of the lens barrel of this embodiment will be briefly described. When performing zooming, the zoom operation ring 11 is rotated around the optical axis. Zoom operation ring 11
Since the end of the arm portion 11B is fitted into the cam ring 5, the cam ring 5 also rotates around the optical axis as the zoom operation ring 11 rotates. Cam groove 5 of this cam ring 5
The cam pins 9 and 10 fitted in the a and 5b move along the cam grooves 5a and 5b as the cam ring 5 rotates. Since the cam grooves 5a, 5b are formed in a spiral shape around the optical axis, the cam pins 9, 10
Tries to move in a direction in which the direction parallel to the optical axis and the direction around the optical axis are combined. However, since the cam pins 9 and 10 are also fitted in the rectilinear grooves 4b and 4c formed in the fixed barrel 4 and parallel to the optical axis 6, the cam pins 9 and 10 cannot move in the direction around the optical axis, and cannot be moved to the optical axis 6. Move only in parallel directions. As a result, the front group lens screw ring 7 to which the end of the front group lens cam pin 9 is fixed, and the front group lens support frame 1 screwed to the front group lens screw ring 7.
3 and the front lens group 2 supported by the optical axis 6
Move in a direction parallel to. Further, the rear lens support frame 8 to which the end portion of the rear group lens cam pin is fixed and the rear group lens 3 supported by this also move in a direction parallel to the optical axis 6.

When the desired magnification is obtained by operating the zoom operation ring 11, this time, the focusing operation ring 12 is rotated around the optical axis in order to focus. When the focusing operation ring 12 is rotated, the projection 13b of the front lens group support frame 13 is fitted into the rectilinear recess 12b of the focusing operation ring 12,
The front lens group support frame 13 rotates around the optical axis. By the way, since the front lens group supporting frame 13 is screwed into the female screw 7a formed in the spiral shape of the front lens group screw ring 7, the front lens group supporting frame 13 rotates in the direction parallel to the optical axis while rotating around the optical axis. Move to. As a result, the front lens group 2 moves in a direction parallel to the optical axis to bring the subject into focus. The zoom operation ring 11 can be manually rotated, but can also be rotated by driving a motor (not shown) as described above.

Although the present invention is applied to the relationship between the focusing ring 12 and the fixed barrel 4 in the above embodiment, the present invention is not limited to this. If it has two cylinders and one cylinder is attached so that it can rotate relative to the other cylinder,
It goes without saying that the present invention may be applied.

[0028]

According to the present invention, since the rotation range of the operating ring is restricted by the rotation range restricting member formed of one member, the mounting work thereof can be easily performed. further,
Since the number of parts is reduced, the manufacturing cost can be reduced.

[Brief description of drawings]

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

FIG. 2 is a view on arrow B in FIG.

FIG. 3 is a perspective view of a main part of a fixed cylinder and an operation ring according to an embodiment of the present invention.

[Explanation of symbols]

2 ... front lens group, 3 ... rear lens group, 4 ... fixed barrel, 4b ...
Straight groove for front lens group, 4c ... Straight groove for rear lens group, 4
h, 4i ... notch, 4f, 4f '... annular groove, 4f ₁ ... one end of the annular groove, 4f ₂ ... the other end of the annular groove, 4p ... first through hole, 4p' ... second through hole, 4q, 4q '... Flange recess, 5 ... Cam ring, 5a ... Front group lens cam groove, 5
b ... Rear lens group cam groove, 6 ... Optical axis, 7 ... Front group lens screw ring, 8 ... Rear group lens support frame, 9 ... Front group lens cam pin, 10 ... Rear group lens cam pin, 11 ... Zoom Operating ring, 12 ... Focusing operating ring, 12b ... Straight recess, 12c ... Inner teeth, 12f, 12f '... Focusing operating ring projection, 13 ... Front lens group support frame, 13a ... Male screw, 13b ... Front group lens Support frame projections, 14 ... Pinions, 21, 21 '... Rotation range restricting members, 21a, 21a' ... Fitting portions, 21b, 21
b '... flange part, 21c, 21c' ... end face.

Claims (1)

[Claims] 1. A lens barrel that houses a lens movably along its optical axis, and a lens support frame that supports the lens, and a tubular operation ring that is rotatable around the optical axis of the lens. A fixed cylinder that covers a part of the outer peripheral surface of the operation ring; a rotation range restriction member that restricts a rotation range of the operation ring with respect to the fixed cylinder; A moving mechanism that moves the supported lens support frame in a direction parallel to the optical axis, and the operation ring has a protrusion protruding in a radial direction on an outer peripheral surface of a portion covered by the fixed cylinder. The fixed cylinder is provided with a predetermined portion with respect to the fixed cylinder of the operation ring that is recessed in the outer peripheral surface direction of the portion covering the outer peripheral surface of the operation ring and extends in the direction of the outer peripheral surface of the operation ring. Slightly larger than the rotation range around the optical axis in both directions An annular groove in which the projection of the operating ring is fitted and slidable is formed in a certain range, and the operating ring is moved in a direction parallel to the optical axis relative to the fixed barrel. And so that the protrusion of the operation ring fits into the groove of the fixed barrel, the end of the fixed barrel in the direction parallel to the optical axis is connected to one end of the annular groove in the optical axis rotation direction. A notch is formed in which the projection can be just inserted, and penetrates the annular groove from the outer peripheral surface of the fixed cylinder, and one end in the optical axis rotation direction thereof coincides with one end around the optical axis of the annular groove, A first through hole is formed such that the other end in the direction around the optical axis matches one end of the rotation range, and penetrates the annular groove from the outer peripheral surface of the fixed cylinder, and the other end in the direction around the optical axis is formed. The end is aligned with the other end around the optical axis of the annular groove, A second through hole whose one end in the vertical direction coincides with the other end of the rotation range is formed, and is fitted into the first through hole and the second through hole of the fixed cylinder as the rotation range restricting member, respectively. There are a first rotation range regulating member and a second rotation range regulating member which are fitted into each other, and each of the rotation range regulating members is formed of one member having elasticity, and is just fitted into the through hole of the fixed cylinder. It has a fitting portion that extends into the annular groove, and a flange portion that restricts radial movement of the fitting portion so that the fitting portion does not slip out of the annular groove in a direction approaching the optical axis. And lens barrel.