JP2594135Y2 - Mirror box light-shielding mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light shielding mechanism mainly used for a mirror box of a single-lens reflex camera.

[0002]

2. Description of the Related Art Conventionally, in a single-lens reflex camera, a mirror rotatably supported in a mirror box is housed. The mirror moves to an observation position in a down state and a photographing position in an up state by rotating.

The mirror reflects light incident from the lens to the finder optical system at the observation position, is located between the mirror box and the finder optical system at the photographing position, and enters the mirror from the finder optical system into the mirror box. To prevent exposure of the film and malfunction of the exposure control.

In order to block the reverse incident light from the finder optical system, a method such as enlarging the shape of a mirror sheet adhered to the back side of the mirror or painting the end face of the mirror black is used. But
The most difficult part to block the back-incident light is the mirror support portion supported by the mirror box. This portion is located between the mirror box and the finder optical system and is provided at a position close to the inner wall of the mirror box. Even if the rotary drive is performed, there is no direct contact with other members, so that it is difficult to block light. . Moreover for rotating whenever the release drive, the deterioration is not early practical be shielded by a flexible material such as blackout curtains and molar Topuren (urethane foam).

Some mirrors have a special shape of the supporting portion to improve the light-shielding effect at the supporting portion. However, there is a problem that the shape is complicated and the manufacturing cost is increased.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a light-shielding mechanism that is durable and can be manufactured at low cost.

[0007]

This and other objects are achieved by the present invention (1) described below. The following (2)-
(4) is preferable.

(1) A mirror box provided in the vicinity of the finder optical system, a mirror rotatably supported in the mirror box, and moved to an observation position and a photographing position by rotation, A light-blocking member rotatably supported with respect to the mirror box, wherein the mirror and the light-blocking member shield the light incident on the mirror box from the finder optical system when the mirror is located at the photographing position. A light-shielding mechanism, wherein the light-shielding member is configured to rotate the mirror to a shooting position,
A contact portion that is in contact with the mirror, and is formed on a side opposite to the contact portion through a rotation center and is rotated by contact between the mirror and the contact portion; And a light-blocking portion inserted into the gap formed in the lens box to block light from entering the mirror box from the finder optical system.

(2) The light shielding mechanism for a mirror box according to (1), wherein a cushioning member made of an elastic material is provided at the contact portion.

(3) The light shielding mechanism for a mirror box according to the above (1) or (2), further comprising an urging means for urging the contact portion in a direction to press the mirror against the mirror.

(4) The light-shielding mechanism for a mirror box according to any one of the above (1) to (3), wherein the light-shielding member is a frame-shaped member having an opening inside which includes an observation screen.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows the light shielding mechanism 1 of the present invention.
FIG. 2 is a cross-sectional side view of a camera body 2 equipped with a camera. A mount 21 is provided on the front of the camera body 2, and a shutter unit 22 is mounted on the back side. The mirror box 3 is disposed between the mount 21 and the shutter unit 22.

In FIG. 1, a finder optical system 4 is provided above the mirror box 3. The finder optical system 4 is disposed above the mirror box 3, a focus plate 41, a transmissive LCD (not shown) provided on the focus plate 41, and a transmissive LCD. A pentaprism 42, a finder 43 formed on the back side of the camera body 2, a pentaprism 42 and a finder 4
3 is provided with an optical element such as a finder loupe 44 provided between the camera 3 and the camera.

A mirror 5 is provided in the mirror box 3. The mirror 5 has a substrate 51 and a mirror reflecting surface 52 stuck on the substrate 51. A support arm 511 protrudes from both ends of the upper end 510 of the substrate 51, and is rotatably supported on the inner wall of the mirror box 3 at the tip of the support arm 511.

With the above-described supporting structure, the mirror 5 can be rotated inside the mirror box 3. And
The mirror 5 is urged downward by a spring in a direction to rotate downward, and the locking pin 31 protruding into the mirror box 3 comes into contact with the bottom surface of the substrate 51 so that the reflection surface 52 is moved to the focus plate 4.
1 is supported in an inclined position.

The mirror 5 supported as described above is driven to rotate by a mirror driving mechanism (not shown) provided outside the mirror box 3. The mirror driving mechanism causes the mirror 5 to be moved upward from the observing position in the inclined posture (the state shown in FIG. 1) and to the photographing position separating the finder optical system 4 and the mirror box 3 (the state shown in FIG. 2 or 3) Then, the setting position is switched.

At the time of non-shooting, the mirror 5 returns to the observation position, and the light incident from the lens into the mirror box 3 is reflected by the reflection surface 52 of the mirror 5 and enters the finder optical system 4.
The light reaches the finder 43 via the pentaprism 42 and the finder loupe 44. Also, when shooting,
The mirror 5 moves to the shooting position, and the light that has entered the mirror box 3 from the lens passes through the mirror box 3, passes through the shutter unit 22, and reaches the film.

Here, a light shielding member 6 is provided between the mirror 5 and the finder optical system 4. Hereinafter, the light shielding member 6 will be described in detail. FIG.
FIG. The light-shielding member 6 has a rectangular frame shape having an opening 67 that includes the observation screen inside,
The two rotating parts 61a and 61b disposed in parallel with each other are provided between the rotating parts 61a and 61b.
a, light-shielding part 6 composed of a member connecting one end of 61b
3 and a contact portion 64 formed of a member connecting the other end.

The rotating parts 61a and 61b each have a pin 62 at the center thereof. The pin 62 is inserted through the inner wall of the mirror box 3, and the rotating member 61a and 61b
Is rotatably supported by the mirror box 3.

The contact portion 64 is connected to the lower sides of the ends of the rotating portions 61a and 61b, and the lower surface of the contact portion 64 is configured to face the mirror 5 at the photographing position.
A buffer member 65 is attached to the lower surface of the contact portion 64. The cushioning member 65 is made of, for example, an elastic material such as sponge, nonwoven fabric, or rubber. Then, the mirror 5 in the photographing state contacts the bottom surface of the buffer member 65.

On the other hand, as shown in FIG. 2, when the mirror 5 moves to the photographing position, a gap 7 is formed between the upper end 510 of the mirror 5 and the inner wall of the mirror box 3. This gap 7
The light-shielding portion 63 is inserted into the light-emitting device. The light-shielding portion 63 is formed in a plate shape, and the lower end portion thereof protrudes slightly below the rotating portions 61a and 61b.

The rotating portion 61a is provided with a locking portion 66 formed to protrude outside the mirror box 3.
Similarly, on the outside of the mirror box 3, a locking piece 32 is provided to protrude above the locking portion 66 protruding outward, and a hook is provided between the locking portion 66 and the locking piece 32. A spring 8 as a biasing means is stretched. The springs 8 urge the rotating portions 61a and 61b to rotate counterclockwise in FIG. That is, the contact portion 64 is urged toward the mirror 5 and the light shielding portion 63 is urged upward. The light shielding member 6 and the spring 8 constitute a light shielding mechanism of the mirror box.

In the above-described configuration, when the mirror 5 is rotated to the photographing position, the lower end of the mirror 5 comes into contact with the contact portion 64 of the light-shielding member 6, and further comes into contact with the urging force of the spring 8. The contact portion 64 is pushed up. Here, since the movement of rotating the mirror 5 to the photographing position is interlocked with the shutter driving, the rotation speed is high, and the mirror 5 is moved at a high speed at the contact portion 6.
4, and further pushes up the contact portion 64.

In such an operation, the rebound of the mirror 5 is prevented by the synergistic effect of the buffer member 65 of the contact portion 64 and the spring 8, and the adverse effect on other mechanisms due to vibration or impact when the mirror is raised is suppressed. can do. In particular, the buffer member 65 has an effect of preventing the reflection surface 52 from being damaged in addition to the above-described operation.

As shown in FIGS. 2 and 3, when the mirror 5 moves to the photographing position, the light shielding member 6
2 and the light-shielding portion 63 is inserted into the gap 7. At this time, as shown in FIG.
It is preferable that the angle between the mirror and the reflecting surface 52 of the mirror 5 be an angle larger than 90 °. With such an angle, the light from the finder optical system 4 hitting the light-shielding portion 63 can be reflected to the finder optical system 4.

By such a rotation, the light shielding portion 63 can be moved to the gap 7 only at the time of photographing.
At the observation position, the light shielding portion 63 is located in a range that does not interfere with the image projected on the viewfinder 43, and can be moved to a light shielding position at the photographing position.

By providing the light shielding mechanism in this way, it is not necessary to make the shape of the mirror 5 complicated so as to fill the gap 7 as in the related art, and the mirror box 3 remains flat.
Since the mirror can be attached to the mirror, the manufacturing cost of the mirror can be reduced, and the attachment can be facilitated. further,
The light-shielding portion 63 of the light-shielding member 6 can be further colored by, for example, coloring black or pasting a black cloth to further enhance the light-shielding effect.

In addition to the configuration described above, the contact portion 64 and the buffer member 65 may be provided separately. For example, the buffer member is fixed to the mirror box 3 side, and the light shielding member 6 is brought into contact with the mirror 5.
The contact portion 64 that applies a rotational force to the buffer member may be provided on the film side of the buffer member.

[0029]

As described above, according to the light-shielding mechanism of the present invention, it is possible to achieve a reliable light-shielding and a simplified mirror shape with a simple configuration. Less deterioration.

Further, since the buffer mechanism also serves as a buffer mechanism, it is not necessary to provide a separate buffer mechanism, and the mounting of one component completes the mounting of the buffer mechanism and the light shielding mechanism, thus facilitating assembly. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view of a camera equipped with a light blocking mechanism of the present invention, showing a state where a mirror is located at an observation position.

FIG. 2 is a cross-sectional side view of the camera equipped with the light-shielding mechanism of the present invention, showing a state where a mirror is located at a photographing position.

FIG. 3 is a front view of a mirror box, showing a state where a mirror is located at a photographing position.

FIG. 4 is an overall plan view of a light shielding member.

DESCRIPTION OF SYMBOLS 1 Light shielding mechanism 2 Camera body 21 Mount 22 Shutter unit 3 Mirror box 31 Locking pin 32 Locking piece 4 Finder optical system 41 Focus plate 42 Pentaprism 43 Finder 44 Finder loupe 5 Mirror 51 Substrate 510 Top edge 511 Support arm 52 Reflecting surface 6 Light shielding member 61a, b Rotating part 62 Pin 63 Light shielding part 64 Contact part 65 Buffer member 66 Locking part 67 Opening 7 Gap 8 Spring

Claims (4)

(57) [Scope of request for utility model registration] A mirror box provided in the vicinity of a finder optical system; a mirror rotatably supported in the mirror box, and moved to an observation position and a photographing position by rotation; And a light-blocking member rotatably supported by the mirror box. When the mirror is located at the photographing position, the mirror and the light-blocking member shield the mirror box from light incident on the mirror box from the finder optical system. A mechanism, wherein the light shielding member is formed on a side opposite to the contact part via a center of rotation when the mirror is rotated to a photographing position, and the contact part contacts the mirror. When the mirror is rotated by the contact between the mirror and the contact portion, the light-shielding portion is inserted into a gap formed between the mirror and the mirror box and blocks light from entering the mirror box from the finder optical system. Mirror box, characterized by having Mechanism. 2. The light-shielding mechanism for a mirror box according to claim 1, wherein a cushioning member made of an elastic material is provided at the contact portion. 3. The light shielding mechanism of a mirror box according to claim 1, further comprising an urging means for urging the contact portion in a direction to press the mirror against the mirror. 4. The light-shielding mechanism for a mirror box according to claim 1, wherein the light-shielding member is a frame-shaped member having an opening on the inside that includes an observation screen.