JPH0961888A - Barrier opening/closing device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact and inexpensive camera which is more excellent in light shielding than a camera utilizing a cam mechanism and where the number of parts is reduced by performing driving for opening/closing a barrier by using a pin member moving in parallel with an optical axis and a rotation transmitting member converting the movement of the pin member to that in a perpendicular direction to the optical axis. SOLUTION: As for this barrier opening/closing device for a camera; the pin member 16 abuts on the abutting part 27 of a fixed frame 1 when a moving frame 2 is collapsed. The pin member 16 urges the rotation of the rotation transmitting member 19, and a spring 20 moves an intermediate lever 17 energized by an energizing spring 25 to a closed state. The lever 17 causes an upper blade 22 to slide following a groove on a decorative plate 5. The projection 22b of the lower blade 22 presses the projection 21b of a lower blade 21 and causes the blade 21 to slide follwing the groove on the plate 5 so as to close the aperture part 24. In this example, the opening/closing of the barrier is performed by the collapsing operation of the moving frame 2, and it is applied to any camera equipped with a zoom mechanism, etc., and performing collapsing operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrier opening / closing device for protecting a photographing lens in a camera having a lens barrel capable of retracting.

[0002]

2. Description of the Related Art A barrier opening / closing device that uses the movement of a lens barrel to move in parallel with the optical axis is a barrier opening / closing device that uses a lever or the like by relative movement utilizing the contact between a fixed surface and the lens barrel. There was a device. For example, in Japanese Patent Laid-Open No. 1-248144, a rotating ring is used.

There has also been a barrier opening / closing device using a cam mechanism which operates in conjunction with the movement of the lens barrel in the optical axis direction.

[0004]

In any case, as a method of transmitting the movement of the lens barrel to the opening / closing operation of the barrier, a method such as using a lever or a rotating ring is inappropriate for light shielding, and It was far from miniaturization.

Also in a barrier opening / closing device using a cam mechanism, light leakage is likely to occur between the cam barrel and the fixed barrel, for example.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a barrier attached to the front surface of a lens of a lens moving member that moves back and forth in the optical axis direction is moved from a photographing position of the lens moving member to a retracted position and a closing operation is performed. In a barrier opening / closing device for a camera, the barrier opening / closing device includes a plurality of barriers each having a plane perpendicular to the optical axis, a biasing spring that biases the barrier to a normally open state, and a back-and-forth movement in the optical axis direction. A pin member provided on the lens moving member in parallel with the optical axis, an abutting portion provided on a fixed frame with which the pin member can abut when the lens moving member moves to the collapsed position, and a pin A member for converting the relative back-and-forth movement of the member with respect to the lens moving member to a direction perpendicular to the optical axis to open / close the barrier,
By moving the lens moving member to the retracted position,
The pin member abuts on the abutting portion and closes the barrier via the rotation transmitting member.

[0007]

The barrier opening / closing device for a camera according to the present invention comprises the moving frame 2
When is retracted, the pin member 16 contacts the contact portion 27 of the fixed frame 1. The pin member 16 prompts the rotation of the rotation transmission member 19, and the spring 20 moves the intermediate lever 17 biased by the biasing spring 25 to the closed state. The lever 17
Slides the upper blade 22 along the groove 23b of the decorative plate 5. The protrusion 22b of the upper blade 22 pushes the protrusion 21b of the lower blade 21, slides the lower blade 21 along the groove 23a, and closes the opening 24.

[0008]

The present invention will be described below with reference to the drawings. FIG.
FIG. 2 is an exploded perspective view of the main part of this embodiment, and FIG. 2 is an exploded perspective view of the main part as seen from the film surface side. FIG. 3 is a front view of the main part as seen from the film surface side when the barrier is opened and FIG. 4 is when the barrier is closed.

As shown in FIGS. 1 and 2, reference numeral 1 denotes a fixed frame, which is fixed to the main body. Reference numeral 2 denotes a moving frame provided with a shutter mechanism, which integrally forms a movement assisting portion 3 that enables movement in the optical axis direction. A decorative plate 5 to which a barrier support plate 4 is screwed is screwed to the front surface of the moving frame 2. The movement assisting portion 3 is provided with a hole 6 and a nut accommodating portion 7 which are sequentially provided in parallel with the optical axis from the moving frame 2 side. A guide tube 8 is provided in the hole 6, and a support shaft 9 is passed through the hole of the guide tube 8. A nut 10 is fitted in the nut storage portion 7. The nut 10 includes
A feed screw 11 is screwed into the holes of the nut housing portion 7 and the nut 10. In addition, the holding frame 14 is provided on the subject side of the fixed frame 1.
Are fastened by screws 15. The support shaft 9 and the feed screw 11 are rotatably sandwiched by the hole 1a of the fixed frame 1 and the hole 14a of the holding frame 14. Lead screw 1
A gear 12a is attached to one end of the object 1 on the object side, and a gear 12b and a gear 12c are meshed with the gear 12a. The gear 12c is fixed to the rotating shaft of the motor 13. Motor 13, gears 12a, 12b, 1
2 c is stored in the fixed frame 1. That is, moving frame 2
Is slidably installed in the fixed frame 1 in which the pressing frame 14 is screwed to the subject side.

As shown in FIGS. 1 and 3, the barrier support plate 4
The pin member 1 so that it can be moved back and forth in parallel with the optical axis direction.
6 is passed through, the intermediate lever 17 is a screw 18
It is axially fixed to the barrier support plate 4 and the decorative plate 5. Reference numeral 19 denotes a rotation transmitting member, which is integrally formed with a cam-shaped cam portion 19a. The pin member 16 can come into contact with the cam portion 19a. The spring 20 is attached to the rotation transmission member 19. One end of the spring 20 is hooked on the convex portion 19b, and the other end of the spring 20 is brought into contact with the hook portion 17a of the lever 17 at the tip thereof hooked on the convex portion 19c. The spring 20 flexes when stopped, for example with a finger when the barrier is closed. The decorative plate 5 is formed with a cylindrical convex portion 5a.
A hole 19d is formed in the rotation transmitting member 19 and is fitted in the convex portion 5a. The rotation transmitting member 19 and the spring 20 which are passed through the convex portion 5a are axially stopped by inserting the tip of the convex portion 5a into the hole 4a of the barrier support plate 4. The rotation transmitting member 19 and the pin member 16 are arranged at positions where the pin member 16 contacts the cam portion 19a.

As shown in FIGS. 1, 3, and 4, the decorative plate 5
A lower blade 21 and an upper blade 22, which are barriers, are installed in this order from the subject side. Further, the decorative plate 5 is formed with grooves 23a and 23b for supporting the upper blade 22 and the lower blade 21 so as to be movable in the vertical direction in the drawing. Groove 23a
The projections 21a and 21b of the lower blade 21 and the groove 23b.
The projection 22a of the upper blade 22 is fitted in the. A protrusion 22b is integrally formed on the subject side of the upper blade 22. The protrusion 22b of the upper blade 22 is fitted between the protrusions 21a and 21b of the lower blade 21. The protrusion 22b abuts the protrusion 21a when it rises, and conversely when it descends, the protrusion 2b.
It is configured to come into contact with 1b. In this way, when the upper blade 22 is pulled down in the drawing, the lower blade 21 is pulled down with a delay. As shown in FIG. 4, the lower blade 21 covers the upper part of the opening 24 and the upper blade 22 covers the lower part to close it. When the upper blade 22 is moved to the upper end from the state of FIG. 4, the blades 21 and 22 are stored in a stacked state as shown in FIG. Intermediate lever 17
Is provided with a hanging portion 17b, and is engaged with the projection 22c of the upper blade 22 that has passed through the hole 4b of the barrier support plate 4.

The biasing spring 25 is incorporated in a boss 5b formed integrally with the decorative plate 5. The urging spring 25 has one end hooked on the boss 5c and the other end hooked on the hook portion 17c of the lever 17 so as to urge the upper blade 22 and the lower blade 21 in the normally open state.

The movable frame 2 is formed with a hole 26 through which the pin member 16 can project, and the fixed frame 1 is formed with an abutting portion 27 with which the pin member 16 can abut. The movable frame 2 and the barrier support plate 4 on which the pin member 16 moves are shielded from light by a conventionally known method.

The operation of the lens barrel having the above-mentioned structure when the barrier is changed from the open state to the closed state will be described. . When the motor 13 is driven to rotate in the right direction in FIG. 2 from the position where the moving frame 2 is moved to the subject side from the fixed frame 1 which is the shooting position, the gears 12c, 12b, 12 are moved.
The feed screw 11 rotates via a. The nut 10 and the feed screw 11 mesh with each other, and the nut 10 is fixed to the movement assisting portion 3, so that the moving frame 2 moves to the film surface side. A light-shielding cloth (not shown) is provided at a portion of the holding frame 14 where the movable frame 2 slides, and the light-shielding cloth functions as a light shield to keep the movable frame 2 stable. . The pin member 16 also moves to the film surface side due to the collapsing of the moving frame 2. Even when the pin member 16 contacts the contact portion 27, the moving frame 2 continues to be retracted to the fixed frame 1 until it is completely retracted. When the pin member 16 comes into contact with the contact portion 27, the pin member 16 stops, but the moving frame 2 continues to be retracted, so that the moving member 2 moves relatively to the subject side with respect to the moving frame 2. In FIG. 3, the lever 17 has an urging spring 25, and
7c, it is always urged upward. However, when the pin member 16 abuts the abutting portion 27, the pin member 16 pushes the cam portion 19 a and rotates the rotation transmitting member 19 against the biasing force of the biasing spring 25. Spring 20
Is rotated clockwise. The hook 17a that is in contact with the spring 20 causes the intermediate lever 17 to move the screw 1
Rotate counterclockwise around 8 parts. The hook portion 17b of the lever 17 pushes the projection 22c of the upper blade 22 downward in the drawing, so that the projection 22a of the upper blade 22 slides along the groove 23b and moves downward in the drawing. The projection 21b of the upper blade 22 pushes the projection 21b downward in the drawing, so that the projections 21a and 21b of the lower blade 21 slide and move along the groove 23a. In this way, the upper portion of the opening 24 is attached to the lower blade 21.
However, the lower blade is covered and closed by the upper blade 22. FIG. 4 shows this state.

In order to change the barrier from the closed state to the open state, the motor 13 is driven to rotate counterclockwise in FIG. 2 from the position where the movable frame 2 is completely retracted into the fixed frame 1.
Feed screw 11 through gear 12c, gears 12b, 12a
Rotates, and the moving frame 2 moves to the subject side. Abutment 27
The pin member 16 that is in contact with is relatively moved to the film surface side as the moving frame 2 moves to the subject side.
Since the force applied to the rotation transmitting member 19 is eliminated, the lever 17 is pulled up by the biasing spring 25. The projection 22c locked to the hanging portion 17b is interlocked with the movement of the lever 17, and the upper blade 22 moves upward. The lower blade 21 moves when the protrusion 22b of the upper blade 22 pushes the protrusion 21a upward. Thus, as shown in FIG. 3, the blades 21 and 22 are accommodated in the overlapping state.

Further, in this embodiment, the movable frame 2 is used to open and close the barrier.
However, the present invention can be applied to any camera having a zooming mechanism and the like for collapsing operation.

[0017]

According to the present invention, the pin member 16 for moving the opening / closing of the barrier in parallel with the optical axis and the rotation transmitting member 19 for converting the movement of the pin member 16 in the direction perpendicular to the optical axis are used. Therefore, it is much more effective in shielding light than moving by moving on the barrier surface such as a lever. Needless to say, the light shielding is superior to that of the camera using the cam mechanism. Further, in terms of utilizing the collapsible lens barrel, it is possible to reduce the number of parts, so that it is possible to provide a compact camera and an inexpensive camera.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main part of a camera of the present invention.

FIG. 2 is an exploded perspective view of a main part as seen from the film surface side.

FIG. 3 is a front view of the main part when the barrier is opened as seen from the film surface side.

FIG. 4 is a front view of the main part when the barrier is closed as seen from the film surface side.

[Explanation of symbols]

 1 Fixed Frame 1a Hole 2 Moving Frame 3 Moving Aid 4 Barrier Supporting Plate 4a, 4b Hole 5 Decorative Plate 5a Convex 5b, 5c Boss 6 Hole 7 Nut Storage 8 Guide Tube 9 Support Shaft 10 Nut 11 Feed Screw 12a, 12b , 12c Gear 13 Motor 14 Holding frame 14a Hole 15 Screw 16 Pin member 17 Intermediate lever 17a, 17b, 17c Hanging part 18 Screw 19 Rotation transmitting member 19a Cam part 19b, 19c Convex part 19d hole 20 Spring 21 Lower blade 21a, 21b Projection 22 upper blades 22a, 22b, 22c projections 23a, 23b groove 24 opening 25 biasing spring 26 hole 27 abutting part

Claims (1)

[Claims] 1. A barrier opening and closing device for a camera, wherein a barrier attached to the front surface of a lens of a lens moving member that moves back and forth in an optical axis direction is moved from a photographing position of the lens moving member to a retracted position to close the barrier. The barrier opening / closing device includes a plurality of barriers having a plane perpendicular to the optical axis, an urging spring for urging the barrier to a normally open state, and a back-and-forth movement in the optical axis direction. A pin member provided parallel to the axis, an abutting portion provided on a fixed frame with which the pin member can abut when the lens moving member moves to the collapsed position, and a relative position of the pin member with respect to the lens moving member. A rotation transmitting member that converts the longitudinal movement into a direction perpendicular to the optical axis and opens and closes the barrier. When the lens moving member moves to the collapsed position, the pin member abuts the abutting portion, and the rotation transmitting member. Through A barrier opening / closing device for a camera, characterized in that the barrier is closed.