JP2000171857A - Barrier opening/closing driving device for lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a barrier opening/closing driving mechanism having simple constitution by providing a fixed relative operation member which sets an opening/closing lever free when a lens barrel unit is at a photographing position and turns the opening/closing lever so as to close a barrier against an energizing mechanism when the unit is moved from the photographing position to a housing position. SOLUTION: When the lens barrel unit 10 is at the photographing position, the arm 20b of an opening/closing crank lever 20 and te fixed relative operation member are in a disengaged state. Then, a pair of barriers 16 are opened because an opening/closing ring 18 is turned in a barrier opening direction by a tension spring 19 overcoming the force of a torsion spring 17. In contrast, when the unit 10 is moved to the housing position, the arm 20b of the lever 20 abuts on the fixed relative operation member and the lever 20 is turned counterclockwise with the movement of the unit 10. Then, the ring 18 is turned in a direction where it closes the barrier 16 against the force of the spring 19 by the engaging relation between the arm 20a and a turning operation projection 18b, so that a pair of barriers 16 close a photographing aperture 13.

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 drive device for opening / closing a photographing opening at the tip of a lens barrel.

[0002]

2. Description of the Related Art Conventionally, many types of barrier mechanisms of this type have been known for zoom compact cameras, for example.
Although practically used, these are generally mechanisms for opening and closing the barrier by using the relative moving force of a plurality of relatively moving (rotating or linearly moving) barrel members constituting the zoom lens barrel. On the other hand, for example, in a single focus digital camera, the lens barrel unit simply advances and retreats from the camera body, and there is often no member that moves relative to the lens barrel unit. For this reason, there are very few barrier mechanisms, and even those with a barrier are usually provided on the camera body side or use a dedicated motor for opening and closing the barrier. For this reason, there is a problem that a dead space for retreating the barrier is required.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel unit that moves between a storage position and a photographing position based on the above awareness of problems.
An object of the present invention is to provide a barrier opening / closing drive mechanism having a simple configuration without requiring a lens barrel member that moves relatively in a lens barrel unit.

[0004]

SUMMARY OF THE INVENTION A barrier opening / closing drive mechanism according to the present invention has a photographing lens, and is a lens barrel unit supported on a camera body so as to be able to advance and retreat in a storage position in the optical axis direction and a photographing position; Open and close the shooting aperture formed at the tip,
A barrier supported by the lens barrel unit; an opening / closing ring supported by the lens barrel unit so as to be rotatable about the optical axis and in direct engagement with the barrier, and opening and closing the barrier to open and close with the rotation; An opening and closing lever rotatably supported on the peripheral surface of the unit and driving the opening and closing ring with the rotation; an urging mechanism for opening the barrier when no external force is applied to the opening and closing lever;
A fixed relative operation member provided on the camera body, which is disengaged from the opening / closing lever when the lens barrel unit moves between the storage position and the photographing position; When the lens barrel unit is moved from the photographing position to the storage position when the lens barrel unit moves from the photographing position to the storage position, the lens unit engages with the open / close lever to rotate the open / close lever when the lens barrel unit is in the photographing position. And closing the barrier against the biasing mechanism.

In this barrier opening / closing drive mechanism, since the opening / closing operation is performed by engaging and disengaging an opening / closing lever supported by the lens barrel unit and a fixed relative operating member on the camera body side, a relative moving member is provided in the lens barrel unit. Even if it does not exist, a barrier opening / closing drive mechanism can be formed, and is suitable for a camera having a simple structure, for example, a single focus digital camera.

The urging mechanism can be composed of, for example, a barrier spring for urging the barrier in the closing direction and an opening / closing ring spring for urging the opening / closing ring in a direction to open the barrier with a stronger force than the barrier spring. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
Reference numeral 0 denotes a lens barrel main body 12 for holding the photographing lens 11, a makeup frame 14 having a frontmost shooting aperture 13, and a barrier holding ring 15 located between the lens barrel body 12 and the makeup frame 14. The lens barrel main body 12, the decorative frame 14, and the barrier holding ring 15 are integrated non-relative moving members.

A pair of barriers 16 for opening and closing the photographing opening 13 of the decorative frame 14 are supported on the barrier holding ring 15 so as to be openable and closable. The pair of barriers 16 are rotationally symmetrical about the optical axis, and include an opening / closing blade 16a, a rotation fulcrum hole 16b,
It has an opening / closing operation projection 16c and a stopper projection 16d. On the other hand, the barrier holding ring 15 has a rotation center projection 15a, a spring center projection 15b, which fits relatively rotatably in the rotation fulcrum hole 16b, and a pair of sector holes 15c for projecting the opening / closing operation projection 16c of the barrier 16. . The torsion spring (barrier spring) 17 fits the center coil portion into the spring center protrusion 15b with the rotation center projection 15a of the barrier holding ring 15 fitted in the rotation fulcrum hole 16b of the barrier 16, and attaches both end legs. The barrier 16 is hung on a spring hook hole 16 e of the barrier 16 and a spring hook wall 15 d of the barrier holding ring 15 to urge the barrier 16 in the closing direction. The barrier retaining ring 15 includes a barrier 16
A stopper wall 15e is formed which engages with the stopper projection 16d and regulates the closed position.

An opening / closing ring 18 is supported between the barrier holding ring 15 and the lens barrel body 12 so as to be rotatable about the optical axis. The opening / closing ring 18 protrudes from a pair of sector holes 15 c of the barrier holding ring 15, and the opening / closing operation projection 16 c of the barrier 16 is provided.
And an interlocking projection 18a that engages with

The opening / closing ring 18 is urged in the barrier opening direction by a tension spring (opening / closing ring spring) 19 stronger than the torsion spring 17, and the interlocking projection 18a opens the barrier 16 via the opening / closing operation projection 16c. . The opening / closing ring 18 also has a rotation operation projection 18b facing the sector-shaped notch 12a formed on the peripheral surface (cylindrical surface) of the lens barrel main body 12.

The lens barrel main body 12 is formed with a rotation fulcrum boss 12b that is directed in the radial direction of the lens barrel main body 12 on a peripheral surface near the sector notch 12a.
, An open / close crank lever 20 is pivotally mounted. The open / close crank lever 20 has a pair of arms 20a and 20b,
The arm 20a is engaged with the rotation operation projection 18b of the opening / closing ring 18. When no external force is applied, the opening / closing crank lever 20 is located at a position where the barrier 16 is opened by the force of the tension spring 19 that urges the opening / closing ring 18.

With respect to the above elements on the lens barrel unit 10 side,
The camera body 30 side stores and holds the lens barrel unit 10 and guides the lens barrel unit 31 so as to be able to linearly advance and retreat to a storage position in the optical axis direction and a shooting position;
And 2. The lens barrel box 31 has a guide rod 33 that guides the lens barrel body 12 of the lens barrel unit 10 straight forward, and the front decorative plate 32 has an advance / retreat opening 34 for moving the lens barrel unit 10 forward and backward. The front decorative plate 32 holds the lens barrel unit 10 in the lens barrel box 31,
It is fixed to the front surface of the lens barrel box 31.

As shown in FIGS. 3 and 4, the lens barrel box 31 is integrally provided with a fixed relative operation member 35. When the lens barrel unit 10 advances and retreats in the optical axis direction, the fixed relative operation member 35 engages and disengages the arm 20b of the open / close crank lever 20 to open and close the barrier 16.

That is, in the apparatus having the above-described structure, when the lens barrel unit 10 is moved to the photographing position in front of the optical axis by the driving mechanism (not shown), the open / close crank lever 20 is moved.
Arm 20b and fixed relative operation member 35 are disengaged. In this state, since no external force is applied to the opening / closing crank lever 20, the opening / closing ring 18 rotates in the barrier opening direction by the force of the tension spring 19 which overcomes the force of the torsion spring 17, so that the interlocking projection 18a and the opening / closing operation projection 16c are formed. The pair of barriers 16 is opened via.

On the other hand, when the lens barrel unit 10 is moved from the photographing position to the retracted position in the optical axis direction, the arm 20b of the open / close crank lever 20 on the lens barrel main body 12 comes into contact with the fixed relative operation member 35. The opening / closing crank lever 20 rotates counterclockwise in FIG. 3 with the rearward movement of the lens barrel unit 10. Then, due to the engagement relationship between the arm 20a and the rotation operation projection 18b, the opening / closing ring 18 rotates in the direction to close the barrier 16 against the force of the tension spring 19, and passes through the interlocking projection 18a and the opening / closing operation projection 16c. Then, the pair of barriers 16 close the photographing opening 13. FIG. 2 shows a state in which the arm 20b of the open / close crank lever 20 is relatively pushed forward, and the pair of barriers 16 has closed the photographing opening 13.

Hereinafter, the opening and closing of the barrier 16 is performed in the same manner as the lens barrel unit 10 advances and retreats in the optical axis direction.

[0017]

The lens barrier opening / closing drive mechanism of the present invention moves the opening / closing lever supported on the peripheral surface of the lens barrel unit to a fixed relative position on the camera body side by advancing / retreating the storage position of the lens barrel unit and the photographing position. Since the opening / closing operation is performed by being disengaged from the operation member, a barrier opening / closing drive mechanism can be configured even if there is no relative moving member in the lens barrel unit. Suitable for focus digital cameras.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a lens barrier opening / closing drive device according to the present invention.

FIG. 2 is a perspective view of an assembled state of the lens barrel unit alone.

FIG. 3 is a plan view showing the relationship between the lens barrel unit and a fixed relative operation member on the camera body side.

FIG. 4 is a perspective view showing a fixed relative operation member on the camera body side.

[Explanation of symbols]

 Reference Signs List 10 lens barrel unit 11 photographing lens 12 lens barrel main body 12a sector-shaped notch 12b rotation fulcrum boss 13 photographing opening 14 decorative frame 15 barrier holding ring 15a rotation center projection 15b spring center projection 15c sector hole 16 barrier 16a opening and closing blade 16b times Moving fulcrum hole 16c Opening / closing operation protrusion 16d Stopper protrusion 17 Torsion spring (barrier spring) 18 Opening / closing ring 18a Interlocking protrusion 18b Rotating operation protrusion 19 Tension spring (Opening / closing ring spring) 20 Opening / closing crank lever 20a 20b Arm 30 Camera body 31 Lens barrel box 32 Front decorative panel 33 Guide rod 34 Retractable opening 35 Fixed relative operation member

Claims (2)

[Claims] 1. A lens barrel unit having a photographing lens and supported by a camera body so as to be able to advance and retreat to a storage position and a photographing position in an optical axis direction; a photographing opening formed at a distal end of the lens barrel unit is opened and closed. A barrier supported by the lens barrel unit; supported by the lens barrel unit so as to be rotatable about the optical axis and directly engaged with the barrier, and driven to open and close the barrier with the rotation. Opening / closing ring; an opening / closing lever rotatably supported on the peripheral surface of the lens barrel unit and driving the opening / closing ring with the rotation; a bias for opening the barrier when no external force is applied to the opening / closing lever A fixed relative operation member provided on the camera body, which is disengaged from the opening / closing lever when the lens barrel unit moves between the storage position and the photographing position; Lens barrel unit When the lens barrel unit is moved from the photographing position to the storage position when the lens barrel unit moves from the photographing position to the storage position, the lens unit engages with the open / close lever to rotate the open / close lever when the lens barrel unit is in the photographing position. And a barrier opening / closing drive device for the lens, wherein the barrier is closed against the urging mechanism via 2. The barrier opening / closing drive device according to claim 1, wherein the biasing mechanism biases the barrier spring in a direction to close the barrier, and moves the opening / closing ring with a force stronger than the barrier spring in a direction to open the barrier. A lens barrier opening / closing drive device comprising an opening / closing ring spring for urging.