JP2000171677A - Light shielding device for shutter and focusing unit and fixing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a light beam intruding the inside of a shutter and focusing unit having a moving photographing lens inside to be surely shielded without making the diameter of a lens barrel large-sized. SOLUTION: A lens holding frame 21 holding the photographing lens 20 moved forward and backward is arranged in the shutter and focusing unit 11 having a shutter bottom board 13 and a supporting bottom board 28 at both end parts. By attaching and fixing a freely elongating and contracting hollow cylindrical light shielding rubber barrel 36 whose inside diameter is smaller than the outside diameter of the unit 11 to an outside circumference between the boards 13 and 28, the light beam intruding from a gap between the outside circumference of the frame 21 and the aperture part 28a of the board 28 is shielded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a light-shielding device for a shutter / focus unit disposed in a lens barrel and a method for fixing the same.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, the light enters a gap between a photographing opening 2a of a support base plate 2 of a shutter / focus unit 1 disposed in a lens barrel and an outer periphery of a lens holding frame 3. It passes through the gap between the support base plate 2 and the shutter base plate 4, passes through the gap between the outer periphery of the shutter / focus unit 1 and the lens barrel cover 5, and
The light beam R passing through a gap between the outer periphery of the camera and the second rectilinear barrel 7 and reaching the film surface 8 of the camera body (not shown) is blocked as a first light blocking structure by the support base plate 2 of the shutter / focus unit 1 or the shutter. By forming a rib extending in the photographing optical axis direction from one of the base plates 4 or the support base plate 2 and the shutter base plate 4 around the entire outer periphery, the rib between the photographing opening 2a of the support base plate 2 and the outer periphery of the lens holding frame 3 is formed. The light rays entering from the gap were blocked. As a second light shielding structure, as shown in FIGS. 11 and 12, light shielding sheets 9 and 10 are fixed to the outer periphery of the shutter / focus unit 1 so that the photographing opening 2a of the support base plate 2 and the lens holding frame 3 are fixed. To block light rays entering from the gap with the outer periphery of the light source.

[0003]

By the way, in the above-mentioned prior art, in the case of the first light shielding structure, the rib extending in the direction of the photographing optical axis is formed on the entire outer periphery, so that the diameter of the lens barrel becomes large. was there. In the case of the second light-shielding structure, if the light-shielding sheets 9 and 10 are fixed with an adhesive, it is difficult to securely fix the light-shielding sheets 9 and 10 to the end surfaces. Further, if the adhesive is protruded due to the attachment of the light-shielding sheets 9 and 10, or if the end faces of the light-shielding sheets 9 and 10 are not securely fixed, the light-shielding sheets 9 and 1 are not assembled during the assembly.
The zero end face portion is bent in the outer peripheral direction, and the distal end portion 7a of the second rectilinear barrel 7 is caught by the bent portion of the light shielding sheets 9 and 10 during the zoom operation, so that a zoom operation failure occurs. Further, the light-shielding sheets 9 and 10 are peeled off from the bent portions due to the repetition of the zooming, so that the light rays entering from the gap between the photographing opening 2a of the support base plate 2 and the outer periphery of the lens holding frame 3 are surely prevented. There was a problem that light could not be shielded.

If the light-shielding sheets 9 and 10 are fixed with double-sided tape, the outer periphery of the arm 3a of the lens holding frame 3 is attached to the double-sided tape, and the lens holding frame 3 cannot move forward and backward in the direction of the photographing optical axis. There is a problem that a focus operation failure occurs.

The present invention has been made in view of the above-mentioned problems of the prior art, and has been made in consideration of the above-mentioned problems of the prior art, without increasing the diameter of the lens barrel. It is a first object to provide a device. A second object of the present invention is to provide a fixing method of a light shielding device capable of securely fixing a light shielding member similarly fixed to the outer periphery of a shutter / focus unit.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a shutter for moving back and forth in a lens barrel.
An expandable and contractible light shielding member is provided on the outer periphery between support members forming both ends of the focus unit.

[0007]

According to the present invention, there is provided a shutter / focus system comprising a first support member and a second support member which are arranged in a lens barrel and move back and forth in the direction of a photographing optical axis. A shutter and a light blocking device for a shutter and focus unit having a shooting lens unit disposed in the shutter and focus unit and moving back and forth in the direction of a shooting optical axis. By providing the member, it is possible to block light rays that have entered the shutter / focus unit without increasing the lens barrel diameter. Further, it is possible to prevent small foreign matters such as sand and dust entering the shutter / focus unit from entering the lens barrel unit and the camera body. According to the second aspect of the present invention, since the light shielding member has a hollow cylindrical shape, it is possible to reliably shield light rays entering the shutter / focus unit without taking up space.

According to a third aspect of the present invention, there is provided a shutter / focus unit comprising a first support member and a second support member which are disposed in a lens barrel and move back and forth in the direction of a photographing optical axis; In a method of fixing a light-blocking device having a light-blocking member which is disposed in a shutter / focus unit and moves back and forth in the direction of a photographing optical axis, and a light-blocking and telescopic light-blocking member on the outer periphery of the shutter-focus unit, By setting the inner diameter of the shutter smaller than the outer diameter of the shutter / focus unit, the light shielding member
Can be fixed to the outer periphery of the focus unit. According to a fourth aspect of the present invention, the first support member and the second support member each have a step on the entire outer periphery, and the light blocking member is fixed to the step to increase the lens barrel diameter. Without doing
The light shielding member can be securely fixed to the outer periphery of the shutter / focus unit. The present invention according to claim 5, wherein a recess is provided on one of the first support member and the second support member, or on the entire outer periphery of the first support member and the second support member. Is provided on the entire inner periphery of the light shielding member, so that the light shielding member can be reliably fixed to the outer periphery of the shutter / focus unit without increasing the lens barrel diameter.

[0009]

1 to 6 show a first embodiment of the present invention.
It will be described based on. FIG. 1 is an exploded perspective view showing a configuration of a shutter / focus unit of the present embodiment, FIG. 2 is an exploded perspective view showing a light shielding configuration of the shutter / focus unit,
FIG. 3 shows a shutter with a light-shielding rubber tube incorporated therein.
FIG. 4 is a perspective view of the focus unit, FIG. 4 is a cross-sectional view thereof, FIG. 5 is a cross-sectional view of a first two-unit lens barrel with a shutter / focus unit incorporated, and FIG. It is sectional drawing of the lens barrel of a structure. First, the configuration of the shutter / focus unit will be described with reference to FIG. In the figure, reference numeral 11 denotes a shutter / focus unit. 12 is a shutter unit,
The shutter base plate 13 having the photographing opening 13a (first
Support member), a shutter blade 14 disposed behind the shutter base plate 13, and an actuator 15 disposed in front of the shutter base plate 13 for driving a shutter blade.
It is composed of A focus gear 16 transmits a driving force of a motor 26 to be described later to the feed screw 24. The focus gear 16 is rotatably fitted to and held by a gear shaft 13 b formed on the shutter base plate 13, and is held by the focus base plate 17. The focus base plate 17 is fixed to the shutter base plate 13 by two screws 18.

A photographing lens unit 19 includes a photographing lens 20 and a lens holding frame 21 for holding the photographing lens 20.
And a cylindrical fitting metal 22 fixed by press-fitting to an arm portion 21 a formed on a part of the outer periphery of the lens holding frame 21, and a pulse plate 23 fixed by bonding. A feed screw 24 supports the photographing lens unit 19 in the photographing optical axis direction and moves forward and backward in the photographing optical axis direction. The feed screw 24 has a gear 24a and a male screw 24b, and the gear 24a meshes with the focus gear 16. The male screw 24b meshes with a female screw 25a of a nut 25 incorporated in an arm 21a on the outer periphery of the lens holding frame 21. The feed screw 24 has a shaft 24c formed at the tip of the gear 24a in a hole 13c formed in the shutter base plate 13, and a shaft 24d formed at the tip of the male screw 24b in a support base plate 28 described later. Hole 28 formed
b, the feed screw 24 is rotatably supported, and the photographing lens unit 1
9 is supported by the shutter unit 12.

Reference numeral 26 denotes a cylindrical motor for moving the photographing lens unit 19 back and forth in the photographing optical axis direction. One is formed in a through hole 17a formed in the focus base plate 17, and the other is formed in a support base plate 28 described later. Through hole 18a,
By fitting each, the shutter unit 12
It is supported by. A pinion gear 26 a is incorporated at the tip of the motor 26 and meshes with the focus gear 16. Reference numeral 27 denotes a guide shaft for supporting the photographing lens unit 19 in the photographing optical axis direction, and is slidable with a U-shaped notch (not shown) formed at a position facing the arm 21a of the lens holding frame 21. Is fitted. The guide shaft 27
Is a hole 17b having one end formed in the focus base plate 17.
The other end is fitted and supported in a hole (not shown) formed in a support base plate 28 described later.

Reference numeral 28 denotes a support base plate (second support member) that supports the photographing lens unit 19, the motor 26, and the guide shaft 27, and is formed with an opening 28a through which the lens holding frame 21 penetrates. And is fixed to the shutter base plate 13 and the focus base plate 17 by three screws 29. Reference numeral 30 denotes a guide shaft for supporting the photographing lens unit 19 in the photographing optical axis direction, which is slidably fitted to the fitting metal 22, and one end of which is fitted in a hole 17 c formed in the focus base plate 17. The other end is fitted and supported in a through hole 22a formed in an adjustment plate 32 described later. A spring 31 for urging the photographing lens unit 19 rearward is disposed between the arm 21a of the lens holding frame 21 and an adjustment plate 32 described later.
Numeral 32 denotes an adjusting plate for adjusting the inclination of the taking lens unit 19, which is fixed to the supporting base plate 28 by screws 34 via a washer 33. Numeral 35 denotes two adjusting shafts for operating the adjusting plate 32, and holes 2 formed in the support base plate 28.
8d and a hole 32b formed in the adjustment plate 32 are rotatably fitted to each other, and are held by the support base plate 28 by the adjustment plate 32.

The operation of this embodiment having the above configuration will be described. First, the focus driving will be briefly described. When the motor 26 is energized, the pinion gear 26a
Rotates, and the torque is transmitted to the gear 24a of the feed screw 24 via the focus gear 16, and the feed screw 24 rotates. The rotation of the feed screw 24 causes the photographing lens unit 19 to move back and forth along the lead of the feed screw 24 in the photographing optical axis direction. When the photographic lens unit 19 is extended, it moves in the photographic optical axis direction while charging the spring 31.

Next, the shutter / focus unit 1
The light shielding configuration 1 will be described in detail with reference to FIGS. In the figure, reference numeral 36 denotes a stretchable hollow cylindrical light-shielding rubber cylinder (light-shielding member) that shields light rays R that have entered from a gap between the outer periphery of the lens holding frame 21 and the opening 28a of the support base plate 28, Prevents intrusion of small foreign substances such as sand and dust. The light-shielding rubber cylinder 36 is fixed to the outer periphery of the shutter / focus unit 11 as shown in FIGS. 3 and 4, and the inner diameter thereof is set smaller than the outer diameters of the shutter base plate 13 and the support base plate 28. Therefore, the shutter / focus unit 11 holds the light-shielding rubber cylinder 36 by the elastic force of the light-shielding rubber cylinder 36.

Further, each lens barrel incorporating a shutter / focus unit will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 shows a lens barrel having a two-group configuration, and FIG. 6 shows a lens barrel having a four-group configuration. First, in FIG. 5, reference numeral 37 denotes a fixed cylinder which is fixed to a camera body (not shown), and has a helicoid screw 37a and two rectilinear grooves 37b formed in the inner periphery thereof. A helicoid screw 38a formed on the rear side of the rotary cylinder 38 is rotatably meshed, and supports the first rotary cylinder 38 on the inner peripheral side. Also, two convex portions 39a formed at the rear end of the first rectilinear cylinder 39 fitted on the inner peripheral side of the first rotary cylinder 38 are slidably engaged with the two rectilinear grooves 37b. I agree. That is, the first rotary cylinder 38 rotates together with the first rectilinear cylinder 39 while rotating around the outer periphery of the first rectilinear cylinder 39 and the helicoid screw 37a.
Along the lead of the camera. At this time, the first rectilinear barrel 39 moves back and forth in the photographing optical axis direction with the rectilinear groove 37b of the fixed barrel 37 as a guide.

Two linear grooves 38b are formed on the inner periphery of the first rotary cylinder 38, and are provided at the rear end of the second rotary cylinder 40 fitted on the inner peripheral side of the first linear cylinder 39. The two camshafts 3 formed in the first rectilinear barrel 39 are provided with the two transmission shafts 41.
9d slidably engages with the rectilinear grooves 38b. The two transmission shafts 41 transmit the rotational power of the first rotary cylinder 38 to the second rotary cylinder 40. Further, three cam grooves 3 are formed on the inner peripheral surface of the first straight barrel 39.
9b, two rectilinear grooves 39c, and two penetrating cam holes 39d having the same lead angle as the cam grooves 39b are formed at the rear end of the second rotary cylinder 40 in the cam grooves 39b. The second rotary cylinder 40 is supported by the first rotary cylinder 38 by slidably fitting the three cam shafts 42 provided. The second rotary cylinder 4 is provided in the straight groove 39c.
The two convex portions 43a formed at the rear end of the second rectilinear barrel 43 disposed on the inner periphery of 0 are slidably fitted.

That is, when the first rotary cylinder 38 rotates, its rotational power is transmitted to the second rotary cylinder 40 via the two transmission shafts 41, and the second rotary cylinder 40 travels in the second straight direction. While rotating the outer periphery of the cylinder 43, it moves back and forth in the photographing optical axis direction along with the second rectilinear cylinder 43 along the three cam grooves 29 b of the first rectilinear cylinder 39. At this time, the second rectilinear barrel 43 moves back and forth in the photographing optical axis direction using the two rectilinear grooves 39c of the first rectilinear barrel 39 as a guide.

In the inner circumference of the second rotary cylinder 40, three cam grooves 40a and 40b are formed in each group.
The three camshafts 45 provided in the convex portions 44a formed in the second lens group holding frame 44 are slidable through the three straight holes 43b of the second straight barrel 43 in the cam grooves 40a. The second group lens holding frame 44 is supported by the second rotary cylinder 40 by the fitting of the cam shaft 45. Further, three cam shafts 47 provided at the rear end of the lens barrel cover 46 are slidably fitted in the cam grooves 40b. Is the second rotary cylinder 4
0 supported.

The second rectilinear cylinder 43 has three penetrating rectilinear holes 43b and two rectilinear grooves 4 formed in the outer periphery thereof.
A projection 44a of the second group lens holding frame 44 is slidably fitted in the three rectilinear holes 43b, and the lens barrel is fitted in the two rectilinear grooves 43c. Cover 46
Are fitted slidably. That is, when the second rotary cylinder 40 rotates, the second group lens holding frame 44 is moved to the second rotary cylinder 40.
The lens barrel cover 46 moves back and forth in the direction of the photographing optical axis along the three cam grooves 40a with the three rectilinear holes 43b of the second rectilinear cylinder 43 serving as guides. The two rectilinear grooves 43c of the second rectilinear barrel 43 along the groove 40b
The guide moves between the second rotary barrel 40 and the second rectilinear barrel 43 in the photographing optical axis direction. Further, a flange portion 46b is formed on the front side of the lens barrel cover 46, and a flange portion 46b is provided in front of the flange portion 46b.
b, a barrier device 47 for opening and closing the photographing opening 46c formed in the shutter 46b is mounted on the rear surface of the flange 46b.
The focus unit 11 is fixed by screws.

Next, the four-unit lens barrel shown in FIG. 6 will be described. In the figure, reference numeral 50 denotes a fixed cylinder, which is fixed to a camera body (not shown), and has a helicoid screw 50a, two rectilinear grooves 50b, and a penetrating lead having the same lead angle as the helicoid screw. Two cam holes 5
0c is formed, and the helicoid screw 50a is rotatably meshed with a helicoid screw 51a formed on the rear side of the second rotary cylinder 51, and supports the second rotary cylinder 51 on the inner peripheral side. The two linear grooves 50b are slidably engaged with two convex portions 52a formed at the rear end of the linear cylinder 52 fitted on the inner peripheral side of the second rotary cylinder 51. ing. Reference numeral 53 denotes a first rotary cylinder, which is rotatably fitted and supported on the outer periphery of the fixed cylinder 50, and has two rectilinear grooves 53a formed on the inner periphery thereof. Two transmission shafts 54 provided at the rear end of the second rotary cylinder 51 are slidably fitted through the two cam holes 50c of the fixed cylinder 50.

That is, when the first rotary cylinder 53 rotates, its rotational power is transmitted to the second rotary cylinder 51 via the two transmission shafts 54, and the second rotary cylinder 51 is
While rotating around the outer circumference of the fixed cylinder 50, it moves back and forth along the lead of the helicoid screw 50a of the fixed cylinder 50 in the direction of the photographing optical axis. At this time, the rectilinear barrel 52 moves back and forth in the photographing optical axis direction using the two rectilinear grooves 50b of the fixed barrel 50 as guides.

On the inner periphery of the second rotary cylinder 51, three cam grooves 51b, 51c and 51d are formed in each group, and the cam grooves 51b are provided with straight holes 5 of the straight cylinder 52.
The three camshafts 55a formed in the fourth group lens holding frame 55 through the second camshaft 2b are slidably fitted to each other.
The fourth group lens holding frame 55 is
1 supported. Further, in the cam groove 51c, three cam shafts 56a formed at the rear end of the shutter / focus unit 56 (corresponding to the shutter / focus unit 11) penetrate through the rectilinear holes 52b of the rectilinear barrel 52. The shutter / focus unit 56 is movably fitted with the camshaft 56a.
1 supported. Three cam shafts 58 provided on a convex portion 57a formed at a rear end portion of the lens barrel cover 57 through the rectilinear hole 52b of the rectilinear cylinder 52 are slidably fitted in the cam groove 51d. The lens barrel cover 57 is supported by the second rotary cylinder 51 by this fitting. In addition, shutter
A light-shielding rubber cylinder 36 is fixed to the outer periphery of the focus unit 56.

That is, as the second rotary cylinder 51 rotates, the fourth lens group holding frame 55 moves along the three cam grooves 51b of the second rotary cylinder 51, and the shutter / focus unit 56 moves. Along the three cam grooves 51c of the second rotary cylinder 51, and the lens barrel cover 57, along the three cam grooves 51d of the second rotary cylinder 51,
Is moved back and forth in the direction of the photographing optical axis using the rectilinear hole 52b as a guide. Further, a flange portion 57b is formed on the front side of the lens barrel cover 57, and a first-group lens unit 5 is provided in a photographing opening 57c formed in the flange portion 57b.
9 is fixed, and the first group lens unit 5
A barrier device 60 that opens and closes 9 is incorporated.

As described above, according to the present embodiment,
By providing the light shielding rubber cylinder 36 on the outer periphery of the shutter / focus unit 11 or 56, the lens holding frame 21
A light beam that has entered through a gap between the outer periphery of the support base plate 28 and the opening 28a of the support base plate 28 can be reliably blocked. In addition, sand,
It is possible to prevent entry of small foreign matter such as dust. Further, by setting the inner diameter of the light-shielding rubber cylinder 36 to be smaller than the outer diameters of the shutter base plate 13 and the support base plate 28, the shutter / focus unit 11 can be securely fixed. Can be prevented.

FIG. 7 shows a second embodiment of the present invention. For the sake of simplicity, the same parts as those in the first embodiment are denoted by the same reference numerals, and only different points will be described. FIG. 7 is a sectional view of a shutter / focus unit to which the light-shielding rubber cylinder of the present embodiment is fixed. In this embodiment, steps 13d and 28e are formed on the entire outer periphery so that the light-shielding rubber cylinder 36 to be mounted does not travel in the outer peripheral direction in the direction facing the shutter base plate 13 and the support base plate 28, respectively. Light-shielding rubber cylinder 36 between 13d and 28e
It incorporates Other configurations are the same as those of the first embodiment.

In this embodiment having the above structure, the inner diameter of the light-shielding rubber cylinder 36 is set smaller than the outer diameters of the shutter base plate 13 and the support base plate 28 as in the first embodiment, and the step portion 13d of the shutter base plate 13 is formed. And the step 2 of the support base plate 28
8e, the shutter / focus unit 11 is securely fixed to the shutter / focus unit 11.
Can be fixed, so that the end face of the light-shielding rubber cylinder 38 can be prevented from being turned up and the zoom operation failure can be reliably prevented.

FIG. 8 shows a third embodiment of the present invention. FIG. 8 shows a shutter with the light-shielding rubber cylinder of this embodiment fixed.
FIG. 3 is a sectional view of a focus unit. In the present embodiment, a circumferential recess 13 e is formed on the entire outer circumference of the front surface of the shutter base plate 13, and a protrusion inserted into the recess 13 e of the shutter base plate 13 is provided on the inner circumference of one end of the light-shielding rubber cylinder 36. 36a. Other configurations are the same as those of the first embodiment.

In this embodiment having the above structure, the inner diameter of the light-shielding rubber tube 36 is set smaller than the outer diameters of the shutter base plate 13 and the support base plate 28, and the light-shielding rubber tube 36 is mounted, as in the first embodiment. In some cases, by inserting the convex portion 36a into the concave portion 13e of the shutter base plate 13 and mounting it,
Since the light-shielding rubber cylinder 36 can be securely fixed to the shutter / focus unit 11, it is possible to prevent the end face of the light-shielding rubber cylinder 36 from being turned up and to reliably prevent a zoom operation failure. In this embodiment, the concave portion 13e is formed on the entire outer periphery of the shutter base plate 13. However, a concave portion is formed on the entire outer periphery of the support base plate 28, and the convex portion 36a of the light shielding rubber cylinder 36 is inserted into the concave portion. May be fixed.

FIG. 9 shows a fourth embodiment of the present invention. FIG. 9 shows a shutter in which the light-shielding rubber cylinder of this embodiment is fixed.
FIG. 3 is a sectional view of a focus unit. In the present embodiment, circumferential recesses 13e and 38f are formed on the entire outer circumference of the front surface of the shutter base plate 13 and the support base plate 28, and the recesses of the support base plate 28 are formed on the entire inner circumference of both ends of the light-shielding rubber cylinder 36. 2
8 f and projections 36 a and 36 b inserted into the recess 13 e of the shutter base plate 13, respectively. Other configurations are the same as those of the first embodiment.

In the present embodiment having the above-described structure, the inner diameter of the light-shielding rubber cylinder 36 is set smaller than the outer diameters of the shutter base plate 13 and the support base plate 28, and the light-shielding rubber cylinder 36 is mounted as in the first embodiment. Sometimes the convex portions 36b and 36a
Are inserted into the concave portion 13e of the shutter base plate 13 and the concave portion 28f of the support base plate 28, respectively, so that the light-shielding rubber cylinder 36 can be securely fixed to the shutter / focus unit 11. It is possible to prevent the end face from being turned up, and also to prevent the zoom operation failure.

[0031]

As described above, the first aspect of the present invention comprises the first support member and the second support member which are disposed in the lens barrel and move back and forth in the direction of the photographing optical axis. A shutter / focus unit, and a shutter / focus unit light-shielding device including a shooting lens unit disposed in the shutter / focus unit and moving back and forth in the direction of the shooting optical axis. By providing the extendable light-shielding member, it is possible to reliably shield the light beam that has entered the shutter / focus unit without increasing the lens barrel diameter. Further, it is possible to prevent small foreign matters such as sand and dust entering the shutter / focus unit from entering the lens barrel unit and the camera body. Claim 2
In the present invention, the light-shielding member has a hollow cylindrical shape and can be mounted on the shutter / focus unit without taking up space.

According to a third aspect of the present invention, there is provided a shutter / focus unit comprising a first support member and a second support member which are disposed in a lens barrel and move back and forth in the direction of a photographing optical axis; In a method of fixing a light-blocking device having a light-blocking member which is disposed in a shutter / focus unit and moves back and forth in the direction of a photographing optical axis, and a light-blocking and telescopic light-blocking member on the outer periphery of the shutter-focus unit, By setting the inner diameter of the shutter smaller than the outer diameter of the shutter / focus unit, the light shielding member
It can be securely fixed to the outer periphery of the focus unit. According to a fourth aspect of the present invention, by providing a step on the entire outer periphery of each of the first support member and the second support member, the light-shielding member can be focused on the shutter without increasing the lens barrel diameter. It can be securely fixed to the outer periphery of the unit, and it is possible to prevent light-blocking defects, zoom operation defects, and focus operation defects due to peeling. The present invention according to claim 5, wherein a recess is provided on one of the first support member and the second support member, or on the entire outer periphery of the first support member and the second support member. By providing the convex portion to be inserted into the entire periphery of the light-shielding member, the light-shielding member can be securely fixed to the outer periphery of the shutter / focus unit without increasing the lens barrel diameter. In addition, poor zoom operation and poor focus operation can be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a shutter / focus unit according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the shutter / focus unit and the light-shielding rubber cylinder.

FIG. 3 is a perspective view of a shutter / focus unit in a state where a light-shielding rubber cylinder is incorporated.

FIG. 4 is a longitudinal sectional view of the same.

FIG. 5 is a longitudinal sectional view of a first lens barrel incorporating the shutter / focus unit.

FIG. 6 is a longitudinal sectional view of a second lens barrel incorporating the shutter / focus unit.

FIG. 7 is a longitudinal sectional view of a shutter / focus unit showing a method of fixing a light-shielding rubber cylinder according to a second embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of a shutter / focus unit showing a method for fixing a light-shielding rubber cylinder according to a third embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a shutter / focus unit showing a method for fixing a light-shielding rubber cylinder according to a fourth embodiment of the present invention.

FIG. 10 is a longitudinal sectional view showing a light ray intrusion path in a conventional lens barrel.

FIG. 11 is an exploded perspective view showing a light shielding configuration of a conventional shutter / focus unit.

FIG. 12 Similarly, a shutter incorporating a light shielding sheet.
FIG. 3 is a perspective view of a focus unit.

[Explanation of symbols]

11, 56 · · · shutter focus unit, 12 ·
Shutter unit, 13 Shutter base plate (first support member), 13d Step, 13e recess, 17
・ Focus base plate, 19 ・ ・ Photo lens unit, 21
..Lens holding frame, 28..Support base plate (second support member), 28a..Imaging opening, 28e..Step, 28
f · · · recess, 36 · · · light shielding rubber cylinder (light shielding member), 36
a, 36b... convex part, 43... second rectilinear barrel, 47.

Claims (5)

[Claims] 1. A shutter / focus unit which is disposed in a lens barrel and includes a first support member and a second support member which moves back and forth in the direction of a photographing optical axis, and is disposed in the shutter / focus unit. A shutter and focus unit provided with a photographing lens unit that moves back and forth in the direction of a photographing optical axis, wherein a shutter and focusable light shielding member are provided on the outer periphery of the shutter and focus unit. Light shielding device of the unit. 2. The light-shielding device for a shutter / focus unit according to claim 1, wherein said light-shielding member has a hollow cylindrical shape. 3. A shutter / focus unit which is disposed in a lens barrel and includes a first support member and a second support member which moves back and forth in the direction of a photographing optical axis, and is disposed in the shutter / focus unit. In a method of fixing a light-blocking device including a photographing lens unit that moves back and forth in the photographing optical axis direction and a light-blocking and expandable light-blocking member on the outer periphery of the shutter / focus unit, the inside diameter of the light-blocking member is the shutter focus A method for fixing a light-shielding device, characterized in that the setting is made smaller than the outer diameter of the unit. 4. The fixing of the light-shielding device according to claim 3, wherein the first support member and the second support member are each provided with a step on the entire outer periphery, and the light-shielding member is fixed to the step. Method. 5. A recess is provided in one of the first support member and the second support member, or in the entire outer periphery of the first support member and the second support member, and is inserted into the recess. 4. The projection according to claim 3, wherein the projection is provided on the entire inner circumference of the light shielding member.
The method for fixing the light-shielding device according to the above.