JPS6045410B2 - Motor drive device in single-lens reflex camera - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention incorporates two motors into a single-lens reflex L-nox camera, the first motor is used for the shutter and film winding, and the second motor is used for the shutter and film winding. The present invention relates to a motor drive device in a single-lens reflex camera that uses a mirror to drive the mirror.

(Prior Art) As a motor drive means in a single-lens reflex camera for automatic film rewinding or automatic winding,
Conventionally, a method has generally been adopted in which an external drive mechanism is configured separately from the camera body, and this external drive mechanism is connected to the camera body when necessary.

Incidentally, recently, the convenience of camera operation using this type of motor drive has been recognized, and the usage rate of motor drive operation connected to the external drive mechanism is increasing.

As a result, there has been an increasing demand for the development of a camera with a motor drive that is built into the camera body while maintaining the size of the current camera.

In order to store energy for each mechanism necessary for camera operation using a single drive motor built into the camera, a fairly powerful motor is used, and a complicated connection mechanism is installed.
Fine adjustments to the details are required. For example, a shutter mechanism,
In order to match the drive start time or startup completion time for each mechanism for the related drive of the film winding mechanism or mirror operation mechanism, etc., fine adjustment of the related mechanisms of these mechanisms and high precision of the mechanism are required. Finishing, etc. is required.

Moreover, in order to transmit the driving force from one drive source to each of the above-mentioned mechanisms, if the driving force is efficiently transmitted to one of these mechanisms, an intermediate transmission mechanism is required to transmit the driving force to the other mechanism. This intermediate mechanism causes power loss, and therefore requires a large motor with high power as the drive source.

As a result, a large battery with a large capacity is required as a power source.

On the other hand, current single-lens reflex cameras have undergone highly technical improvements in their mechanical structure and external shape, and there is no space inside the camera large enough to accommodate the large motor or large battery.

Therefore, in the conventional device, a configuration means using the above-mentioned external housing mechanism has been adopted to house the drive section and the power supply section.

Let us consider again the mechanical conditions on the driven side in this type of motor drive mechanism.

Some camera mechanisms do not necessarily need to perform set operations in a series or simultaneously.

That is, the film winding mechanism and the shutter charging mechanism.These are the parts of each mechanism. The film winding mechanism and the shutter charging mechanism function as independent operations, but there is a strong mechanical connection between the film winding mechanism and the shutter charging mechanism, such as in fixed film winding and double winding prevention mechanism.

Moreover, since current camera mechanisms have almost complete and advanced device configurations, they can be seen as an integrated mechanism for film winding and shutter charging.

Therefore, when considering the relationship between the related operations between the two mechanisms, the film winding and shutter charging mechanism and the mirror operating mechanism, we find that a condition is imposed between the two mechanisms to perform sequential operations at the timing of each mechanism's operation. However, there is no condition that requires simultaneous operation between these mechanisms, especially in the energy storage operation timing for the shutter operation of these mechanisms, and there is little correlation between them.

Moreover, the necessary connection is a signal element for starting or ending the operating period of each mechanism, and no mechanical structure with force transmission is required for transmitting these signals.

In addition, when considering the quick return mechanism configuration of the mirror drive mechanism, we found that when the winding charge is driven by conventional lever operation and motor drive, in addition to accumulating driving force to flip the mirror out of the optical path, it also returns to the mirror optical path. It was also designed to energize the stored force for operation.

Moreover, the accumulated force for returning the mirror is sufficient to ensure the safety of securing the mirror flip-up position and the ability to return to different camera postures, even though the mirror return operation itself is sufficiently possible due to the mirror's own weight. In order to ensure reliable operation and to increase the speed of operation, the device is configured to have a spring force that is considerably stronger than the stored spring force that is originally required for the return operation.

The accumulation of return force for this quick return mirror operation is considered to be one of the reasons why a high-output motor is particularly required in the motor drive device.

In order to eliminate this accumulation of mirror return force,
A proposal to realize a quick return mirror device by providing a light shielding plate and a mirror separately, arranging each movably in the horizontal direction, and arranging them alternately on the optical axis
-53412) is being carried out. According to this invention, there is no need to store force for high-speed rocking of the mirror as described above, and by dynamically balancing the operations of the mirror and the light-shielding plate, the conventional quick-return mirror can be seen at the end of its operation. It is possible to prevent shocks caused by

Furthermore, this proposal realizes the mirror and the light shielding plate using a motor.

(Problems to be Solved by the Invention) The quick return mirror device according to the above proposal has excellent features as described above.

However, since the light-shielding plate and mirror are provided separately and each is movable in the horizontal direction, it is necessary to provide a space inside the camera for evacuation when each is not performing its original function. be.

For this reason, it is not possible to satisfy the demand for realizing a motor drive camera built into the camera body with a size similar to the current camera shape.

The object of the present invention is to incorporate two motors into a single-lens reflex camera, the first motor being used for the shutter and film winding, and the second motor driving a conventional movable mirror. An object of the present invention is to provide a motor drive device for a single-lens reflex camera.

(Means for Solving the Problem) In order to achieve the above object, a motor drive device for a single-lens reflex camera according to the present invention includes a first motor for shutter charging and film winding drive, and a first motor for driving a mirror. In the single-lens reflex camera with a focal plane shutter provided with two motors, the second motor
a reduction gear system for transmitting the output of the motor; a half-rotation control gear to which rotation is transmitted from the reduction gear system and rotated half a rotation for raising the mirror and a half rotation for lowering the mirror; and a habit of returning to an optical path oblique position. A swinging mirror is provided, a mirror drive member that pushes up the mirror, and a connection point provided on the half-rotation control gear is connected to the mirror drive member, and the mirror is moved at a retracted position outside the optical path of the mirror. a link member that engages the connection point and the mirror drive member so that a return stress acts on the rotation center of the half-rotation control gear via the connection point; a release signal generating means for generating a release signal; and a shutter mechanism. a shutter operation end detection means for detecting the end of trailing curtain travel and generating a shutter operation end signal; and a mirror position detection means for detecting the position of the mirror and generating a mirror up signal and a mirror down position signal; The signal starts the second motor to drive the mirror upward, the mirror lift position signal stops the motor and the mirror waits at a retracted position outside the optical path, and the shutter operation end signal drives the second motor upward.
The motor drive circuit comprises a motor drive circuit that re-drives the motor to return the mirror to the optical path region, stops the second motor in response to the mirror lowering position signal, and starts the first motor after the shutter operation end signal is generated. ing.

(Example) Hereinafter, the present invention will be described in more detail with reference to the drawings and the like.

FIG. 1 is a perspective view showing mainly a shutter and a film winding mechanism of a motor drive device in a single-lens reflex camera according to the present invention.

The first motor M1 is built into the inner cylinder of the film spool 9. The rotation of the motor M1 is caused by the gear 2
, 3 and 4, the gear 5 is connected to a gear 5 which is controlled to rotate once during one operation.

A spool gear 13 is meshed with the rotating shaft 5 a integral with the gear 5 via a notch gear 7 , a sprocket 8 , a connecting gear 10 , and a one-rotation limiting plate 12 . A friction mechanism is provided between the spool gear 13 or the relay gear 12 and the spool 9 to absorb excess rotation.

Further, the notched gear 7 is a gear interlocked with the shutter charge mechanism side, and has a part of its tooth row cut out, and serves as a clutch in the coupling operation.

In other words, the leading gear 14 faces the meshing area of the gear 7, and the trailing gear 15 is arranged in a one-way vertical connection with the leading gear 14. These gears 14 and 15 are meshed with a leading curtain winding gear 16 and a trailing curtain winding gear 17, respectively. These gears 16 and 17 are integrally attached to a leading curtain winding shaft 19 and a trailing curtain winding shaft 18, respectively. A leading curtain tensioning lever 20 is provided in a turning region of a protrusion (not shown) provided on the side surface of the leading curtain gear 14.
1) The other end of the leading curtain tensioning lever 20 is pushed in the direction of the arrow in the figure in its final operating range by the flip-up operation of the mirror.

Further, one end of the trailing curtain tensioning lever 21 is made to face the turning area of a protrusion (not shown) provided on the side surface of the trailing curtain gear 15, and an electromagnetic magnet 22 for starting shutter closing is placed at the other end of the trailing curtain tensioning lever 21. A suction iron piece 23 is attached. On the other hand, a pin 26a is installed on the side surface of the trailing curtain interlocking gear 26 that meshes with a gear 25 integrated with the trailing curtain winding shaft 24.
One end of the relay lever 27 faces the turning range of a.
The other end of this relay lever 27 is brought into contact with one end of a film fixed amount winding regulating lever 28.
The value end of 8 is the one-rotation limiting plate 1 using this as a fitting and locking piece.
It is designed to fit into the notch of No. 1.

Switches S4, S6, and S7 are electric circuit changeover switches to be described later, and their movable contacts are operated by the regulating lever 28 to control opening and closing of the circuit.

In the film winding and shutter charging mechanism of the apparatus of the present invention shown in the first figure, the rotating shaft 5a is rotationally driven by the rotational drive of the motor M through the speed reduction mechanism of the gears 2, 3 and 4 in a control operation to be described later. , after one rotation, one end of the regulating plate 28, which had been in pressure contact with the outer periphery of the one-turn limiting plate 11, falls into the notch, preventing rotation of the shaft 5a, and controlling the motor M1 by controlling the electric circuit described later. The drive operation also stops.

By the rotation of the rotation shaft 5a, the film is wound onto the film supool 9, and one rotation of the sprocket 8 completes the winding of the film for one frame. The leading gear 1 is connected to the leading gear 1 through the gear 14 and the trailing gear 15 which is rotationally driven integrally with the gear 14 in the winding direction.
6 and the rear curtain gear 17 to complete shutter charging.

From the state shown in the first diagram, which shows the completed state of film winding and shutter charging, the front curtain tensioning lever 20 is activated in the final region of the mirror-up operation, which will be described later! It is rotated in the direction of the arrow in the figure, and the other end of the leading gear 14 is brought into contact with a protrusion on the side thereof, thereby releasing the state in which rotation of the gear 14 is prevented.

As a result, the gear 14 rotates along with the leading curtain in the opposite direction to that at the time of charging, with the accumulated force. After a predetermined period of time has elapsed after the shutter is opened by this operation, the electromagnetic magnet 22 is de-energized and is no longer held on the adsorption iron plate 23, so that the rear curtain gear 15 is controlled by the rear curtain tensioning lever 21.
The locking action of 4 is released, the trailing curtain runs, and the shutter is closed.

At the end of this shutter closing operation, the pin 26a of the trailing curtain interlocking gear 26 meshes with the gear 25 integrated with the trailing curtain winding shaft 24.
The lever 27 is pushed clockwise in the figure, and this operation drives the regulation lever 28 to rotate in the direction of the arrow in the figure.
As a result, the lever 28 has one rotation limit plate 1 by the other end.
1 and release the locking action on switches Sl and S2.
and performs a switching operation for S3. Then, this mechanism section becomes ready for winding, and the switch S4
, S6 and S7 change the control state of the electric circuit.

FIG. 2 is a perspective view showing an embodiment of the mirror drive mechanism of the apparatus of the present invention, which corresponds to the film winding and shutter charging mechanism.

The second motor M2 is coupled to a half-rotation control gear 32 via a reduction gear train 31 coupled to its rotating shaft 30.

This half-rotation control gear 32 is caused to rotate by half a rotation to raise the mirror and half a rotation to lower it by the rotational force from the reduction gear system. The relay lever 35 is rotatably provided, and a pin 46a provided at one end of the relay lever 35 and a pin 33a planted around the side surface of the half-rotation control gear 32 are connected by a link lever 34. There is.

A diaphragm drive lever 36 is integrally attached to the relay lever 35 via an excess rotation amount absorbing spring 37, and the other free end of the relay lever 35 is brought into contact with one end of a mirror drive lever 38.

A pin 41 protruding from a mirror mounting frame 47 is brought into contact with an inclined surface at one end of a lever 40 that operates integrally with the mirror drive lever 38 via a spring 39. A pin 40a is installed near the inclined surface of the lever 40, and one end of the locking lever 44 faces the movement area of the pin 40a.

The locking lever 44 is provided with a tendency to rotate so that its other end engages with the bent piece 43a of the release starting lever 43.

A spring 45 is attached between the release starting lever 43 and the mirror drive lever 38, and the starting lever 43
a switch S5 that opens and closes the circuit in conjunction with the movement of the mirror holding frame 47; and a switch S2 that opens and closes the circuit in conjunction with the movement of the mirror holding frame 47;
S3 are arranged respectively.

The operation of the mirror drive section having such a configuration will be explained.

When power is supplied to the motor M2 by operating the release button under the control of the motor drive circuit described later, the rotation of the motor M2 is transmitted to the half-rotation control gear 32 via the reduction gear system 31, and the rotation of the motor M2 is transmitted to the half-rotation control gear 32 via the reduction gear system 31. 32 in the direction of the arrow in FIG.

This causes the link lever 34 to be pulled back from the illustrated position.

Then, the relay lever 35 connected to the other end of the link lever 34 is rotated clockwise in the figure.

This rotation drives the narrowing down lever 36 in the direction of the narrowing down action in the direction of the arrow in the figure.

The mirror drive lever 38 is also rotated in the clockwise direction, and the lever 40 is also rotated integrally with the mirror drive lever 38 to push up the pin 41 while sliding it on the inclined surface at one end thereof. This operation is a state in which the half-rotation control gear 32 rotates half a turn and the pin 33a reaches the position 33b indicated by the broken line (movement of the link lever 34 causes the pin 46a at the other end to move to the position 4).
The state leading to 6b) continues.

While reaching this final operating state, the pushing up operation of the mirror frame 47 by the lever 40 is completed, and at the same time, the locking lever 44 is driven counterclockwise in the figure by the pin 40a of the lever 40.

As a result, the race start lever 43 is moved to the locking lever 4.
4 is disengaged from the locking piece 43a, so the spring 4
The force applied to point 5 causes it to rotate counterclockwise in the figure.

This pivoting operation of the tip of the release starting lever 43 causes the front curtain tensioning lever 20 in the shutter mechanism shown in the first figure to be driven to rotate in the direction of the arrow in the top of the figure, and the shutter release start is started.

In conjunction with the operation of the release start lever 43, the switch S,
When the mirror flips up, the switches S2 and S3 are switched, and the motor M2 is temporarily stopped due to the regulation of the electric circuit, which will be described later.

Then, switches S4, S6, and S7 are activated by the shutter operation end operation (end of trailing curtain travel) in the mechanism shown in FIG.
When the motor M2 is switched, the motor M2 receives power from the electric circuit again and starts, driving the anti-rotation control gear 32 by half a rotation in the direction of the arrow in FIG. 2.

With this operation, the link lever 34 is pushed back toward the upper right in the figure and returns to the position shown by the solid line in the figure.

At this time of return, the protrusion 43b of the release start lever 43 is pushed around using a pin 40b implanted at one end of the lever 40 that operates integrally with the mirror drive lever 38, and moved to the locking position shown in the drawing by the locking lever 44. let Of course, this return operation is followed by the return movement of the lever 40, causing the mirror frame 47 to return to the optical path diagonal area, and the switches S2, S3, and S5 interlocked with these mechanisms are operated by the release button. Everything returns to the previous old state, and motor M
2 also stops its operation.

FIG. 3 is a circuit diagram showing a first embodiment of a motor drive circuit of a motor drive device in a single-lens reflex camera according to the present invention.

This motor drive circuit basically consists of a release signal generating means for generating a release signal, a shutter operation end detecting means for detecting the end of the trailing curtain of the shutter mechanism and generating a shutter operation end signal, and a shutter operation end detecting means for detecting the position of the mirror. and mirror position detection means for generating a mirror up signal and a mirror down position signal.

Then, the second motor is activated by the release signal to drive the mirror upward, and by the mirror raising position signal, the motor is stopped and the mirror is placed on standby at a retracted position outside the optical path, and the shutter operation is completed. The second motor is driven again by the signal to return the mirror to the optical path region, the second motor is stopped by the mirror lowering position signal, and the first motor is started after the shutter operation end signal is generated. do.

Using the battery E as a power source, a power supply regulation circuit for the mirror driving second motor M2 connects a switch S5 and a switch S4 to a circuit section in which a series component of switches S1 and S7 and a switch S3 are connected in parallel. It is configured in series connection with the parallel connected circuit section.

On the other hand, a power supply circuit for the first motor M1 for film winding and shutter charging driving is configured so that the power supply is commonly connected to switches S2 and S6 in series.

Then, when the switch S1, which is the release signal generating means, is closed by operating the switch in the open/close state when the shooting preparation is completed (
A power supply circuit is constructed by closing the switches Sl, S7 and S5, and the motor corner is started to perform a release starting operation following the mirror flip-up drive in the mechanism shown in the second figure.

FIG. 3C shows the switch opening/closing state when the mirror flips up and the front curtain starts running when the shutter starts. In this state, the switch S5 linked to the release start lever 43
When the motor M2 is opened, the power supply to the motor M2 is stopped, and the shutter operation by the first mechanism shown in the figure continues while the mirror is held in a flipped-up state.

At this shutter closing operation (end of trailing curtain travel), switches S4 and S6 forming shutter operation end detection means are activated.
and S7 are switched, and first, the power supply circuit to the motor corner starts supplying power with switches S3 and S4 closed, and the mirror optical path region return operation shown in the second diagram is performed by the motor M2. On the other hand, the power supply circuit to the motor M1 is still in a standby state with the switch S6 closed and the switch S2 opened. This state is shown in FIG. 3-2. Next, when the return of the mirror to the optical path range is completed (as shown in FIG. 4), the switches S3, S5, and S2, which are mirror position detection means, are switched to cut off the power supply to the motor M2.

On the other hand, power supply to the motor M1 is started, and the film winding and shutter charging operations are performed by the first mechanism shown in the figure, and upon completion of these operations, the circuit state as shown in FIG. 3A is achieved. FIG. 4 is a circuit diagram showing a second embodiment of a motor drive circuit of a motor drive device in a single-lens reflex camera according to the present invention.

The operation of this circuit is also basically the same as that of the circuit described above.

The switch S1, which is a release signal generating means, is a switch that is closed in response to a release button operation.

Switch S2 and switch S3 are switches forming mirror position detection means. Switch S2 closes when the mirror returns to the optical path.

Further, the switch S3 is closed when the mirror flips up completely. The switch S4 forms shutter operation end detection means,
It turns off when film winding is completed and closes when the shutter operation ends. The switch S4 is in the open state in the film winding completion state (photography preparation completion state).

The silicon control element SCR is turned on by the closing operation of the switch S1 in response to the release button operation.

When the switch S3 is opened, power is supplied to the corner of the motor via the transistor Tr2 which is in a conductive state, and the flip-up operation of the mirror is started.

When the mirror flips up, switch S3 is closed.
As a result, the transistor Tr2 becomes non-conductive, and power supply to the corner of the motor is stopped.

A shutter operation is started by mechanical interlocking when the mirror flips up, and when the switch S4 is closed at the end of the shutter operation, the transistor Tr3 becomes conductive, and the transistor Trl, which has been in an open state from the beginning of the mirror flip-up operation, becomes conductive. After that, resupply of power to motor M2 is started.

That is, due to the conduction of the transistor Trl, the silicon control element SCR configured in parallel with the transistor Trl is turned off because its conduction holding current is cut off when the shutter button interlocking switch S1, which is probably already in the open state, is opened. Therefore, at the same time as the power supply to the motor M2 is stopped due to the above-described non-conducting movement of the transistor Trl, the switch S4 is turned off.
Under the conduction state of transistor Tr4, transistor Tr5 becomes conductive, power supply to motor M1 is started, and film winding and shutter charging operations are performed.

When the switch S4 is opened at the end of this operation, the power supply to the motor M1 is stopped and each operating section of the circuit is returned to its initial state.

(Effects of the Invention) As explained above in detail, the motor drive device for the single-lens reflex camera according to the present invention uses a motor to directly push up or return the mirror.

Unlike the conventional device, a spring for accumulating force for the mirror quick return operation is not required, and the impact of the mirror operation, which is seen in the conventional camera, is prevented.

It is possible to have a mechanism configuration with high operating efficiency as described above,
Therefore, efficient drive control can be performed using a small motor, and integration into the camera body becomes easier.

Furthermore, in the present invention, by combining a member such as a gear that is driven half a rotation in the driving force transmission system and a link lever or the like having a pivot point at the eccentric position, the pivot point of the lever and the gear etc. The two-mode operating position in which the center of rotation is located on a straight line is considered to be a stable state.

Therefore, members such as positioning members are not required, and the mechanism becomes simple.

As a result, it is possible to provide a single-lens reflex camera drive camera that uses two motors and is almost the same size as a conventional single-lens reflex camera.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing mainly a shutter and a film winding mechanism of a motor drive device in a single-lens reflex camera according to the present invention.

Claims (1)

[Claims] 1. A single-lens reflex camera with a focal plane shutter equipped with a first motor for shutter charging and film winding drive, and a second motor for driving a mirror, a reduction gear system for transmitting the output of the second motor; a half-rotation control gear to which rotation is transmitted from the reduction gear system and rotated half a rotation to raise the mirror and a half rotation to lower the mirror; A mirror driving member that pushes up the mirror is connected to a connecting point disposed on the half-rotation control gear, and the mirror driving member is connected to each other, and when the mirror is in a retracted position outside the optical path, the return stress of the mirror is applied to the half-rotation control gear through the connecting point. a link member that engages the connection point with the mirror drive member so as to act on the rotation center of the rotation control gear; a release signal generating means that generates a release signal; and a shutter operation that detects the end of the trailing curtain of the shutter mechanism and ends the shutter operation. shutter operation end detection means for generating a signal; and mirror position detection means for detecting the position of the mirror and generating a mirror up signal and a mirror down position signal; is driven upward, and in response to the mirror raising position signal, the motor is stopped to standby the mirror at a retracted position outside the optical path, and in response to a shutter operation end signal, the second motor is driven again to move the mirror back to the optical path area. . A motor drive device for a single-lens reflex camera, comprising a motor drive circuit that stops the second motor in response to the mirror lowering position signal and starts the first motor after the shutter operation end signal is generated.