JPS6041545Y2 - Mirror control mechanism of single-lens reflex camera - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a mirror control mechanism for a single-lens reflex camera.

Various mechanisms for controlling the raising and lowering of the mirror of a single-lens reflex camera have been proposed and implemented.

The most common method is to give the mirror or its related members a descending behavior, raise the mirror to the jacket position against this behavior, lock it at the raised position, and then lower it. A configuration is adopted in which the lock is released and the mirror is lowered.

A configuration has also been proposed in which the mirror is raised and lowered using a motor.

In the configuration in which the mirror is locked at the jacket position, it is necessary to release the lock after the shutter operation is completed, and therefore a transmission mechanism for this purpose is required.

The purpose of the present invention is to provide a novel mirror control mechanism for a single-lens reflex camera that allows the mirror to be placed in a mechanically stable position, and by releasing the stable state, the mirror can be lowered. There is a particular thing.

In order to achieve the above object, a mirror control mechanism for a single-lens reflex camera according to the present invention includes a mirror control mechanism for a single-lens reflex camera that includes a built-in motor. The transmission is transmitted to the lifting rotating plate, and a mirror lifting lever connected to the mirror lifting rotating plate via a link is rotated and raised, and the mirror frame, which has been given a descending habit, reaches a raised position by the mirror lifting lever. When this occurs, the motor is stopped in a stable state in which the center of rotation of the rotating plate for raising the mirror and the point of action of the link mechanism are located on a straight line, and the mirror is lowered by rotating the clutch mechanism in the second direction. When the link is released from the mirror lifting rotating plate, the mirror lifting rotating plate returns due to the spring stored by the mirror lifting rotating plate when the mirror is raised, and the stable state of the link is released. The mirror is configured to allow lowering.

According to the above configuration, the mechanism is simple and stable operation can be ensured, so that the purpose of the present invention can be completely achieved.

The present invention will be explained in more detail below with reference to the drawings.

1 and 2 are side views of the mechanism according to the present invention, with FIG. 1 showing the mechanism immediately before release, and FIG. 2 showing the mirror in a state after release.

FIG. 3 is a perspective view mainly showing a mechanism for transmitting the driving force from the motor.

First, transmission of the driving force for raising the mirror will be explained with reference to FIG.

The rotation of a motor (not shown) in the first direction for raising the mirror is transmitted to the gear 1 so as to rotate the gear 1 clockwise.

Gear 2 is a sun gear coupled to gear 1.

A rotation support frame 4 is provided coaxially with this gear 2, and a planetary gear 3 coupled to the gear 2 is provided in this frame 4.

The pins 5a and 5b are pins that restrict the rotation range of the support frame.

The gear 6 is an idle gear, and is a spur gear 7 integrated with a bevel gear 7.
It is bound to a.

The bevel gear 7 is coupled to the bevel gear of the rotating plate 8 for raising the mirror.

When the gear 2 is rotated counterclockwise by the rotation of the motor in the first direction, the planetary gear 3 moves counterclockwise and is coupled to the idler gear 6, and the rotation of the motor in the first direction is the rotation for raising the mirror. The signal is transmitted to the plate 8.

Rotation of the motor in the second direction rotates the planetary gear 3 clockwise and breaks the connection between the motor and the rotating plate 8.

That is, the planetary gear 3 plays a role as a rotation transmission clutch.

Next, the mirror lifting mechanism after the lifting rotary plate 8 and related mechanisms will be explained with reference to FIGS. 1 and 2.

A mirror lifting lever 14 and an auxiliary lever 13 are coaxially arranged on the wall of the mirror box, and a spring 1 is inserted between them.
5 has been handed over and is integrating them.

The auxiliary lever 13 and the rotating plate 8 for lifting the mirror are connected to the link plate 10
are connected with.

A mirror lifting pin 16 is provided on the mirror frame 17, and the frame 17 is given a downward movement by a spring 18.

Reference numeral 19 indicates a trigger hook, and reference numeral 21 indicates a trigger lever that is locked by the hook 19 (FIG. 1).

The trigger lever is given counterclockwise rotational force by a spring 22, and a pin 21 that acts on a trigger switch 24.
a is provided integrally.

23 is a hook that prevents the front curtain from running.

The operation of the embodiment having the above configuration will be described below with additional information on the configuration.

When a motor (not shown) rotates in the first direction in response to a release signal, the rotation is transmitted through a reduction gear train (not shown).
The gear 1 shown in FIG. 3 is rotated clockwise.

When the sun gear 2 is rotated counterclockwise by this rotation, the sun gear 2 is rotatably supported by the support frame 4.
The planetary gear 3 coupled to is moved counterclockwise around the gear 2 and rotates the support frame 4 counterclockwise.

At the same time that the planetary gear 3 is coupled to the idler gear 6, the support frame 4
The rotation hits the stop pin 5b.

The rotation from a motor (not shown) is 1. 2.
3. The lower spur gear portion 7a of the bevel gear 7 is transmitted in the order of
The bevel gear 7 is rotated clockwise via .

The bevel gear of the mirror lifting rotary plate 8 coupled thereto is rotated counterclockwise.

This rotation is transmitted as clockwise rotation of the rotating plate 8 in FIG.

The clockwise rotation of the bevel gear 8 in FIG. .

As the link plate 10 rises, the auxiliary lever 13 is rotated upward in a clockwise direction, and the mirror lift lever 14, which is integrated with a spring, is similarly rotated upward.

This lever 14 pushes up a mirror lifting pin provided on the mirror frame 17.

At the mirror lifting end position shown in FIG. 2, the center 8a of the mirror lifting rotary plate 8 and the supporting points 10a, 10b of the link plates are aligned in a straight line.

In addition, just before this, the mirror lift pin 16 is connected to the trigger hook 1.
9 in a clockwise direction to release the trigger lever 21.

The unlocked trigger lever 21 is rotated counterclockwise by the spring 22, and the hook 23, which is the front curtain start lever, is moved to the left in the figure, and the shutter front curtain (not shown) starts running.

At the same time, the pin 21a implanted in the trigger lever 21 turns on the trigger switch 24 and simultaneously stops the motor.

Even if the motor stops, the link plate 10 is in a stable position relative to the mirror lifting rotary plate, so the spring 18 hanging on the mirror frame 17 cannot exert any rotational force on the rotary plate 8.

Also, in this state, the bevel gear of the rotating plate 8 is connected to the gear train connected to the motor shown in FIG. 1, and the spring 11 does not have enough energy stored in it to overcome this load. The plate 8 cannot be moved and the mirror is kept in its outer state.

Next, when the motor is rotated in the second direction after the shutter operation is completed, the sun gear 2 shown in FIG.
The support frame 4 gets caught in the stop pin 5a and is prevented from rotating, and the planetary gear 3 idles.

When the gear train including the planetary gear 3 or more is separated from the rotating plate 8 for lifting the mirror, the rotating plate 8 for lifting the mirror is removed by the spring 11.
rotates counterclockwise.

This rotation causes the center 8a of the rotary plate 8 and the l of the link plate 10 to
Since the stable state where ea and 10b are in a straight line is released, the mirror lift lever 14 rotates counterclockwise, and the mirror frame 17 is no longer restrained by the mirror lift lever 14 but is moved by the spring 18. be lowered.

The mirror lifting rotating plate 8 stops at the position shown in FIG. 1 because the auxiliary lever 13 is prevented by the stop pin 12.

When the motor further rotates in the second direction, a trigger lever charging mechanism (not shown) causes the trigger charge lever 25 to rotate the trigger lever 21 clockwise, and the trigger hook 19 is rotated clockwise by the spring 20. and then engage the trigger lever 21 to set it.

When the shutter, film, and diaphragm mechanism are charged by the continued rotation of the motor, the motor stops, and the state immediately before release shown in FIGS. 1 and 3 is established.

In addition, in the camera having the mechanism according to the present invention, the motor is the first motor.
When the film rotates in the direction shown in FIG. 1, the rotation is not transmitted to the shutter, film winding mechanism, etc. by another clutch (not shown).

As explained in detail above, the control mechanism according to the present invention is
Since the mirror jacket position forms a stable state with the mechanism, there is no need for a hook or the like for retaining the jacket as in the conventional mechanism, and the configuration is extremely simple.

[Brief explanation of drawings]

1 and 2 are side views showing an embodiment of the mirror drive mechanism according to the present invention, and FIG. 1 shows the mirror drive mechanism immediately before release;
FIG. 2 shows the mirror in the released state. FIG. 3 is a perspective view mainly showing a drive mechanism related to raising the mirror. 1...Gear, 2...Sun gear, 3...
... Planetary gear, 4 ... Rotation support frame, 5a,
5b... Stop pin, 6... Idle gear, 7... Bevel gear, End... Rotating plate for raising the mirror, 10... Link Board, 11...
Coil spring, 12...Pin, 13...
Auxiliary lever, 14...Rising lever, 15...
...Spring, 16...Mirror lift pin, 17.
...Mirror frame, 18...Curved spring, 19...
・Trigger hook, 21...Trigger lever-122
... Spring, 23 ... Hook, 24 ...
...Trigger switch.

Claims (1)

[Scope of utility model registration request] In a mirror control mechanism for a single-lens reflex camera that includes a built-in motor, rotation of the motor in a first direction is transmitted to a mirror-lifting rotary plate via a clutch mechanism, and the mirror-lifting rotary plate is connected to the mirror-lifting rotary plate via a link. Rotate and raise the mirror lift lever, and when the mirror frame, which has a downward habit, reaches the raised position, the center of rotation of the rotating plate for raising the mirror and the point of action of the link mechanism are aligned in a straight line. The motor is stopped in a stable state located at , and the mirror is lowered when the clutch mechanism is disconnected from the mirror-raising rotary plate due to rotation of the motor in the second direction. Mirror control for a single-lens reflex camera, characterized in that the rotating plate for raising the mirror is returned by a spring stored in force when the rotating plate raises the mirror, releases the stable state of the link, and allows the mirror to descend. mechanism.