JPS6030743Y2 - Mirror drive mechanism of motor drive camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mirror drive mechanism for a motor-driven camera that uses a motor to wind a film, set a shutter, and drive a mirror.

When a camera mechanism is driven by a motor, it is necessary to rationalize the temporal distribution of the load on the motor and to even out the load on the motor as much as possible.

Therefore, the inventors of the present invention carried out film winding and shutter setting by rotating the motor in the first direction, provided a spring that gave the mirror a constant downward movement, and set the shutter in the second direction of the motor.
If the mirror is configured to be driven upward against this spring by rotation in the direction of the mirror, film winding, shutter setting, and charging of the quick return mechanism can be performed at the same time as in the past, and the concentration of heavy loads can be dispersed. We focused on

An object of the present invention is to provide a rational mirror drive mechanism for a single-lens reflex camera in which the mirror has a habit of always descending as described above.

Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

FIG. 1 is a plan structural diagram of a single-lens reflex camera using a mirror drive mechanism of a motor drive camera according to the present invention.

FIG. 2 is a front structural view of a single-lens reflex camera using the mirror drive mechanism of a motor drive camera according to the present invention.

FIG. 3 is a diagram showing an embodiment of a transmission system for transmitting rotational force from a motor to a mirror drive mechanism, etc., as viewed from below the camera.

FIG. 4 is a diagram showing an embodiment of the left side surface of the mirror box.

FIG. 5 is a schematic diagram showing the operation of the charge lever that charges the mirror up signal lever.

As can be understood from FIGS. 1 and 2, the motor 1 is provided between the film chamber and the mirror box M, and has upper and lower output shafts.

The rotation in the first direction taken out from the upper output shaft of the motor 1 is mainly used for film winding and shutter charging.

The mirror 41 is driven upward by rotation in the second direction taken out from the lower output shaft of the motor 1.

An outline of one cycle of normal operation of the embodiment of the motor drive camera using the mirror drive mechanism according to the present invention is as follows.

When a release operation is performed using a release button or the like while the film is being wound and the shutter is being charged, the mirror is raised.

As the mirror rises, the front curtain of the shutter is moved.

When the rear curtain of the shutter finishes running, the mirror is lowered, the film is wound, and the shutter is charged to prepare for the next photograph.

Next, the configuration of the present invention will be explained in conjunction with embodiments.

As shown in FIG. 4, the mirror 41 is positioned between the axis of a roller 40 provided on the mirror 41 and a pin 45 fixed to the wall of the mirror box, which is a fixed position inside the camera. A mirror biasing spring 43 is provided that biases the optical axis in a direction of 45°.

The mirror raising signal lever 16 is given a rotational force by a spring 17, and has an initial position shown in FIG. 4.

In synchronization with the completion of the mirror 41 rising, it moves from the initial position, closes the contacts 54 and 55, and transmits a signal indicating the completion of the mirror rising to a motor drive circuit (not shown).

Further, by this movement from the initial position, the trigger switch contacts 56 and 57 of the electric shutter circuit (not shown) are opened.
Hit the front curtain tensioning lever 58 to start shutter operation.

The mirror raising signal lever charge lever 9 is connected to the motor 1.
The rotation in the first direction is transmitted to the mirror raising signal lever 16, and the mirror raising signal lever 16 is pushed clockwise in FIG. (position shown in the figure).

The mirror up signal lever hook lever 20 holds the mirror up signal lever 16 at the initial position.

A mirror lifting mechanism for lifting the mirror 41 against the mirror biasing spring is composed of a mirror lifting lever 38 and a lever 30.

The mirror lifting mechanism hook mechanism for hooking this mirror lifting mechanism at the mirror lifting position is composed of a hook lever 46, a link lever 49, and a lever 52.

The mirror 41 is held in the raised position by locking the hook lever 46 with the portion 30a of the lever 30 pushing the lower end of the mirror raising lever 38.

When the shutter has finished running, the travel completion signal lever 59 pushes the lever 52 of the mirror raising mechanism hook mechanism in the direction of the arrow in FIG. 4, rotates the hook lever 46 clockwise, and releases the hook of the mirror raising mechanism hook mechanism.

As shown in FIG. 3, the clutch mechanism is composed of a clutch gear 24 which is a driving part, a clutch cam 25 which is a driven part, a clutch ball 26, and a spring 27.

The clutch cam 25, which is the driven part, transmits the rotation of the motor 1 in the second direction (rotation in the direction of the half-hour hand in FIG. 3) to the lever 30 of the mirror lifting mechanism to move the mirror lifting mechanism in the mirror lifting direction. Drive.

Further, the clutch cam 25 receives the force of the mirror biasing spring 43 from the mirror lifting mechanism via the lever 30, and rotates the motor 1 in the first direction to move the clutch gear 24, which is the drive unit, as shown in FIG. When the mirror is rotated in the direction indicated by arrow A, the mirror drive mechanism is moved in the mirror lowering direction following the rotation in the first direction.

Although not shown, the motor 1 is rotated by a motor drive circuit.

The motor drive circuit rotates the remoter 1 in the second direction by the shirt release operation.

End 38 of the mirror lifting lever 38 of the mirror lifting mechanism
b presses the end 20a of the mirror up signal lever hook lever 20 in the mirror up end region, and by releasing the hook, the mirror up signal lever 16 is allowed to rotate, and when the rotation is detected, the motor 1 stop rotating.

Then, upon completion of shutter travel, the motor 1 is rotated in the first direction.

Next, the operation of the apparatus of the embodiment will be further explained together with the detailed configuration.

As described above, the motor 1 is rotated in the first direction by the motor drive circuit upon completion of shutter travel.

(Setting of the mirror raising signal lever by rotating the motor in the first direction) The motor 1 is provided with upper and lower output shafts, and a pinion gear 2 is provided on the lower output shaft.

When the pinion 2 is rotated counterclockwise in FIG. 3, the upper gear group shown in FIG. 2 is driven by the upper output shaft to wind the film and charge the shutter.

This counterclockwise rotation is reduced by the reduction gear train 3, causing the gear 4 to rotate in the direction indicated by the arrow α.

A pin 8 is mounted on the gear 6 which is connected to the gear 4 and rotated integrally with the gear 4, and this pin 8 rotates and engages with the pawl 15.

The pawl 15 is rotatably supported by a charge lever 9 to which a counterclockwise rotational force is applied by a spring 11 with a shaft 10 as a fulcrum, and its clockwise rotation is restricted by a pin 13.

The pawl 15 is therefore pushed by the pin 8 and pushes the charge lever 9 clockwise against the spring 11.

As a result, the tip 9a of the charge lever 9 pushes the mirror up signal lever 16.

FIG. 5 1 illustrates the operation of this charge lever 9.

The rotation amount of the gear 6 during hoisting is designed to be at least one rotation or more, and no matter what position and angle the motor 1 is stopped at, during one hoisting operation, the pin 8 is always in contact with the pawl 15. It is to engage with.

Therefore, during one hoisting operation, the 9a portion of the lever 9
It is provided on the side of the mirror box shown in the figure.

Rotate the mirror raising completion signal lever 16 clockwise in FIG. 4.

When this mirror raising completion signal lever 16 is pushed clockwise against the spring 17, the bent portion 16a provided on the lever 16 is locked and held at the tip of the hook lever 20, and the lever Complete 16 sets.

The gear 6 is connected to a clutch gear 24 (see FIG. 3), and rotates the clutch gear 24 clockwise, but the clutch ball 26 and clutch spring 27 housed therein rotate the clutch gear 24 clockwise.
In order to compress and release the clutch cam 2, this rotation
5 is not transmitted.

(Mirror raising drive by rotation of the motor in the second direction) Next, when a mechanism (not shown) performs a shirt release, the motor 1 is rotated clockwise in FIG.
This rotation causes gears 4 and 6 to rotate in the direction indicated by arrow β.

When the gear 6 is rotated in the β direction (clockwise), the gear 6
The pin 8 that is set up engages with the claw 15.

FIG. 5 (■) illustrates the operation in this case.

The pin 8 pushes down the pawl 15 counterclockwise, but the charge lever 9 does not move at all and remains in the position shown in FIG.

If the pin 8 had originally stopped at the position indicated by the imaginary line in Fig. 51, by moving the pin 8 clockwise, the charge lever 9 would return to the position shown in Fig. 5H, and the pin 8 would rotate once. When the claw 15 is pressed down, the claw 15 tilts back and maintains the position shown in Figure 2.

That is, even if the lever 16 is set by the above-mentioned film winding rotation operation and the charge lever 9 has not returned, the clockwise movement of the pin 8 when the mirror lift operation is rotated will cause the lever 16 to be set.
The charge lever 9 is returned to the position shown in FIG.

The rotation of the gear 6 in the β direction during this mirror raising operation pushes the clutch gear 24 counterclockwise.

This rotation is transmitted to the clutch cam 2 via the clutch ball 26.
5 and pushes the clutch cam in the direction shown by β in FIG.

Therefore, the roller 28 fixed to the clutch cam 25
The lever 30 is also rotated counterclockwise, and the lever 30 is pushed clockwise around the shaft 31.

A narrowing lever 32 is provided in common with this lever 30 and a shaft 31, and a bent portion 32 of the narrowing lever 32
a is pushed by the lever 30, and the lever 30 is pushed together clockwise against the spring 33.

By this movement of the aperture lever 32, the aperture mechanism of the lens is operated and the aperture is narrowed down to a predetermined position.

One end 30a of the lever 30 pushed around by the roller 28
Push the mirror lifting lever 38 (see Fig. 4) clockwise around the shaft 39.

A portion 38a of the mirror lifting lever 38 is engaged with the mirror lifting roller 40, and pushes up the roller 40 against the spring 43 that applies rotational force to the mirror 41 in the restoration direction.

The mirror 41 is raised using the shaft 42 as a fulcrum.

A portion 30a of the lever 30 is engaged and locked with a hook 46 at a position where the mirror 41 is raised by S.

This state is shown by the dotted line 30a'.

The reason why the 30a portion of the lever 30 is locked with the hook 46 is to prevent the lever 30 from being returned by the force of the spring 33 when the electric current of the motor 1 is cut off and stopped. Therefore, when the mirror is in the raised state, the lever 30 is once locked by the hook 46 to prevent the lever 30 from returning to its original state.

When the mirror 41 reaches almost the completion of raising due to the clockwise rotation of the mirror raising lever 38 described above, the other end 38b of the mirror raising lever 38 contacts the 20a portion of the hook 20 and pushes the 20a portion of the hook 20.

The foot 20 is rotated counterclockwise around the shaft 21,
By moving the other end 20b of 20 in the counterclockwise direction, the engagement with the portion 16a of the mirror raising completion signal lever 16 is released.

As a result, the mirror raising completion signal lever 16 is moved counterclockwise by the spring 17.

The point of this movement is adjusted to correspond to the fully raised state of mirror 41.

When the signal lever 16 starts to move counterclockwise, at an early stage, the signal lever 16b allows the switch contact piece 54 to move to the left, and the contact pieces 55 and 54 come into contact and generate a signal indicating that the mirror has been raised. .

This signal causes the motor 1 to stop.

When the lever 16 is further restored to its original position, the 16a portion is attached to the contact piece 5.
6 to the left and release it from the contact piece 57.

These contact pieces 56 and 57 form a so-called camera trigger switch, from which counting for controlling the shutter speed is performed.

At the same time point S as when the trigger switch is turned off, the tip 16c of the lever 16 pushes the front curtain tensioning lever 58 to the left in the figure to start the front curtain.

The lever 16 is moved to the position of the pin 23 and stopped.

(Mirror lowering allowed by rotation of the motor in the first direction) When the trailing curtain travel is completed, the trailing curtain travel completion signal lever 59 shown in FIG. At the same time, the lever 52 is moved to the shaft 51.
Push clockwise around the center.

As a result, the link lever 49 is pushed down, and the hook 46
Push and turn clockwise around shaft 47.

Therefore, the portion 30a of the lever 30 separates from the hook 46 and attempts to return to the position shown in FIG. 3 by the force of the spring 33.

However, although it hits the clutch roller 28 and exerts a force that pushes it clockwise, it is prevented from moving due to the resistance of the clutch gear 24, gears 6, 4, and reduction gear train 3.

However, as already explained, when the motor 1 and rotating clutch gear 24 are rotated in the α direction by the hoisting signal, the clutch cam becomes rotatable in the α direction, and the lever 30 pushes the roller 28 and hits the stop pin 36. Return to the position shown in the figure.

This operation of the lever 30 allows the mirror lifting lever 38 to rotate counterclockwise, allowing the mirror lifting roller 40 to descend, and allowing the mirror 41 to return to the 45° position.

This mirror lowering is started when the motor 1 is rotated in the winding direction by a changeover switch (not shown) that is linked to the trailing curtain signal lever 59.

The mirror is lowered at an early stage when the motor 1 starts rotating.

Following the lowering of the mirror, the cycle described in (I) above begins.

This rotation in the first direction subsequently causes the film winding shutter to be charged.

Since the drive mechanism according to the present invention is structured as described above, it can achieve the initial purpose by a distant relative, and also has the following advantages.

When winding up the other mechanisms of the camera (I), only the mirror raising signal lever is set, so the energy used to drive the mirror is small and the load on the motor is not increased.

The mechanism of the mirror raising signal lever can be designed so that it is reliably set no matter what the starting position of the motor.

Since the mirror is given a habit of always descending, and the mirror is pushed up against this tendency before the front curtain runs, there is no need to apply mirror force to the shutter and film winding.

This allows concentration of motor load during hoisting to be dispersed.

[Brief explanation of the drawing]

Figure 1 is a plan view of a single-lens reflex camera using the mirror drive mechanism of a motor drive camera according to the present invention;
The figure is a front structural view. FIG. 3 is a diagram showing an embodiment of the transmission system of the mirror drive mechanism from the motor, as seen from below the camera. FIG. 4 is a diagram showing an embodiment of the left side surface of the mirror box, and FIG. 5 is an explanatory diagram for explaining the operation of the charge lever. 1...Motor, 2...Zenion gear, 3
...Reduction gear train, 4,6...Gear, 8
... Zen, 9 ... Charge lever, 15
......Claw, 16...Mirror up signal lever, 20...Hook lever 24...
Clutch gear, 25...Clutch cam, 26.
...Clutch ball, 27...Clutch spring, 28...Ta-ra, 32...Diameter lever, 36...Stop pin, 38...・・・
...Mirror lift lever 41...Mirror 4
6...Hook lever, 49...Link lever, 59...Travel completion signal lever.

Claims (1)

[Scope of utility model registration request] A mirror drive mechanism of a motor drive camera that performs a Milani upward shutter release by rotation of a motor in a second direction, and completes film winding and shutter setting by rotation of the motor in a first direction after shutter operation is completed, a mirror biasing spring that extends between the mirror and a fixed position within the camera and biases the mirror toward the aiming position;
a mirror-up signal lever to which rotational force is applied and which releases the shutter by movement from an initial position; and a mirror-up signal lever that transmits the rotation of the motor in a first direction to the mirror-up signal lever to generate the rotational force of the mirror-up signal lever. a mirror rise signal lever charge lever that rotates the mirror in the direction of the initial position against the force; a mirror rise signal lever hook lever that holds the mirror rise signal lever in the initial position; and a mirror rise signal lever hook lever that causes the mirror to rise against the mirror biasing spring. a mirror raising mechanism hook mechanism for hooking the mirror raising mechanism at the mirror raising position; a travel completion signal lever for releasing the hook of the mirror raising mechanism hook mechanism upon completion of shutter travel; It has a driving part and a driven part, and the driven part transmits the second rotation of the motor to the mirror raising mechanism to drive the mirror raising mechanism in the mirror raising direction, and the driven part transmits the second rotation of the motor to the mirror raising mechanism. The mirror biasing spring force is transmitted and the motor
a clutch mechanism that causes the mirror drive mechanism to follow the rotation in the first direction to move the mirror in the lowering direction when the drive unit is being rotated by the rotation in the first direction; The motor is rotated in a second direction, and the mirror raising mechanism detects rotation of the mirror raising signal lever by releasing the hook of the mirror raising signal lever hook lever in the mirror raising end region, and rotates the motor. A mirror drive mechanism for a motor drive camera comprising a motor drive circuit that rotates the motor in a first direction when the motor stops and the shutter operation ends.