JPH0467173B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-lens reflex motor drive device that drives a camera mechanism using a motor built into a camera.

2. Description of the Related Art Single-lens reflex cameras that have not only automatic shutter control but also automatic aperture control, either in parallel or selectively, have already been proposed and put into practice.

The purpose of the present invention is to provide a new motor in which an aperture setting mechanism that is biased in the direction of the minimum aperture is biased in the direction of the maximum diameter by a built-in motor, and is moved to a designated aperture position by a signal from an exposure control circuit. The purpose is to provide a drive device.

In order to achieve the above object, a motor drive device according to the present invention drives a camera mechanism by a motor having two output shafts built into a camera. , an aperture setting mechanism that is set from a minimum aperture direction to a maximum aperture position in response to a setting rotational force and stores a force for returning to the minimum aperture direction;
a mirror mechanism that has a self-returning force and is brought to a raised position in response to a rotational force; a first clutch that transmits rotation of one output shaft of the motor in a first direction to the hoisting mechanism as a hoisting rotational force; a second clutch that connects the rotation of the other output shaft of the motor in a first direction to the aperture setting mechanism and the rotation in a second direction as a rotational force for raising the mirror mechanism; and a determined aperture. A number of control signal pulses corresponding to the number of control signal pulses are received from the exposure control circuit, and each time a pulse is received, the aperture mechanism is electromagnetically operated and moved by one tooth, thereby aperture is apertured by the number of teeth corresponding to the number of control signal pulses. An electromagnetic ratchet that allows movement of the mechanism and the motor are rotated in a second direction to raise the mirror mechanism, the aperture of the aperture mechanism is set by the electromagnetic ratchet, the shutter is released, and after the shutter operation is completed, the mirror mechanism is raised. and a motor drive circuit that rotates the motor in a first direction to perform hoisting.

The motor drive device according to the present invention will be described in more detail below with reference to the drawings and the like. The motor drive device according to the present invention relates to a single-lens reflex camera, and effectively utilizes the motor built into the camera, and uses one relatively powerful motor in a time-sharing manner to drive other motors. This solves various problems so that users do not have to use it.

First, the basic structure of the entire apparatus will be briefly described with reference to FIG. In FIG. 1, the part surrounded by a broken line is a control circuit part of the apparatus according to the present invention, and the part surrounded by a broken line is a block diagram of a mechanical component. Further, in the figure, an arrow indicated by a single line indicates a path of an electrical signal, and an arrow indicated by two lines indicates a mechanical operation or a transmission path of a signal.

The motor 200 used in the device according to the invention is
As schematically shown in the figure, two output shafts that rotate together are provided at the top and bottom of the motor body.

A gear 200a is provided on one output shaft, and a gear 200b is provided on the other output shaft. This motor 200 is rotated by the motor control circuit 106 in forward and reverse directions, that is, in first and second directions. Rotation of the motor in the first direction is transmitted to the film and shutter charge mechanism 203 via the output shaft gear 200a and the first clutch 201.

This first clutch 201 is a well-known clutch that only transmits rotation in one direction.
A second motor that transmits rotation of the motor 200 in the first direction.
Does not transmit rotation in the direction of . Charge mechanism 203
As a result, the film winding mechanism 208 winds up the film by one frame, and the shutter 209 is set.
On the other hand, the rotation in the first direction is caused by the rotation of the other output shaft gear 2.
00b and the second clutch 202 to the aperture setting mechanism. The aperture setting mechanism 204 is then driven to the maximum aperture position and held there. That is, in the device according to the invention, the motor 200
The rotation in the first direction causes the film winding, shutter setting, and aperture setting mechanism to be driven to the maximum aperture position.

When the motor 200 is rotated in the second direction, the rotation of the motor 200a is caused by the first clutch 2 as described above.
01 and is not transmitted to 203.

However, the second clutch 202 connects this rotation to the mirror set mechanism 205 and raises the mirror 207. The structure of this second clutch 202 will be explained in detail later. Before the mirror 202 starts to rise or the mirror starts to be put on top, the electromagnetic ratchet 210 moves the aperture setting mechanism 204 to a specified value. The aperture 206 is driven by the setting mechanism to reach a predetermined aperture value. Once the mirror 207 is in place, the shutter 209 is released by a well-known mechanism. When the shutter 209 completes its operation, a signal indicating that the operation has been completed is sent to the CPU 102.

When a signal is sent to the CPU 102, the CPU 102
The motor 20 is immediately connected to the motor drive circuit 106.
0 in the first direction, the motor 200 is rotated in the first direction, and as described above, the film is wound, the shutter is charged, and the aperture mechanism is set to the maximum open position. Prepare for filming. To set the shutter speed aperture value, the output of the photoelectric element 100 is converted into a digital value by the AD converter 101, and the CPU 102 calculates the value by referring to other information.
3 and is output to the shutter time instruction circuit 104. Note that normal photographing is initiated by a release signal applied to the CPU 102, and is started by rotation of the motor in the second direction.

Next, the apparatus according to the present invention will be further explained, focusing on the structure and operation of the second clutch 202 among the above structures.

FIG. 2 is a perspective view showing the second clutch 202, the aperture setting mechanism 204, the mirror setting mechanism 205, the electromagnetic ratchet device, and the aperture pin 206a that is part of the aperture 206. Aperture setting mechanism 2
04 is provided with a narrowing lever 1, a rack plate 3, and a ratchet plate 2 stacked in this order. The protrusion 1a of the aperture lever 1 can engage with an aperture pin 206a of an aperture 206, and its rightmost position (corresponding to the maximum aperture position) is controlled by a pin 25 fixed to the camera body. Note that the narrowing pin 206 is biased so as to come into contact with the portion 1a.

A spring 4 is placed between the narrowing lever 1 and the ratchet plate 2, a spring 5 is placed between the ratchet plate 2 and the rack plate, and a spring 6 is placed between the pins 26 fixed to the body of the rack plate 3. ing. 2a
is a pin planted in the ratchet plate 2 facing downward.

The second clutch mechanism 202 includes a sun gear 7 and planetary gears 9 and 10 that are rotatably supported by a rotary support frame 8 that is rotatable coaxially with the sun gear and are coupled to the sun gear.

The planetary gear 9 is connected to the rack plate 3 and serves to set the aperture setting mechanism toward the maximum aperture value. The planetary gear 10 is connected to a mirror setting mechanism 205, which will be described later, and serves to transmit rotation for setting the mirror. The rotation control plate 12, which is pivoted coaxially with the sun gear 7, is connected at its groove 12a to a pin 3a (see FIG. 3) provided downward on the rack plate 3 of the aperture setting mechanism 204 mentioned above. The angular position relative to the rotation support frame can be changed depending on the position of the rack plate 3. The rotation of the output shaft 200b of the motor 200 shown in FIG. 1 in the first direction is transmitted to the gear 11 as a counterclockwise rotation, and the rotation in the second direction is transmitted as a clockwise rotation.

The mirror set mechanism 205 includes a gear 13, a bevel gear 14 having a spur gear 14a connected to the gear 13 on the lower side, and a mirror disc 15 having a bevel tooth portion connected to the bevel gear 14.

This mirror set mechanism 205 is operated by the motor 2.
00 in a second direction is transmitted from the second clutch mechanism to raise a mirror (not shown).

The electromagnetic ratchet device 210 uses an electromagnet of a type in which a coil 16a is wound around a permanent magnet type iron core 16, and the attractive force is reduced by applying a current. Furthermore, a pallet 18 having an iron piece 17, a pawl 19 pivoted on the pallet, a spring 20 that biases the pallet 18 in a direction in which the iron piece 17 moves away from the electromagnet, and a spring 21 that causes the pawl 19 to rotate clockwise.
Contains. The electromagnet coil 16a is supplied with a pulse train containing a number of pulses corresponding to the aperture value to be set from the electromagnet driver 103, as will be described later.

FIG. 3 shows the camera set up. That is, the rotation of the motor 200 in the first direction causes the winding mechanism (film shutter charge mechanism) 203 to wind up the film and the shutter, and the rotation of the motor in the first direction transmitted by the second clutch 202 causes the winding mechanism (film shutter charge mechanism) 203 to wind up the film and the shutter. Aperture setting mechanism 2
04 is set at the maximum aperture position. In this state, the release signal is sent to the CPU 18 (Figure 1).
is applied, motor drive circuit 106 rotates motor 200 in the second direction. This rotation is transmitted to rotate gear 11 clockwise in FIGS. 2 and 4. This rotation is transmitted to the sun gear 8 as a counterclockwise rotation. Therefore, the rotation support frame 8 has planetary gears 9, 10.
As a result, it is rotated counterclockwise as shown in FIGS. 2 and 4. As a result, the planetary gear 9 separates from the rack of the rack plate 3, and the leftward movement control by the gear 9 is released.

The motor 200 continues to rotate in the second direction;
As shown in FIGS. 2 and 4, when the pin 8a of the rotation support frame 8 hits the rotation control plate 12, it is stopped.

The rack plate 3 is moved to the left by the spring 6, and the ratchet plate 2 is moved to the left together by the spring 5 applied between the rack plate 3 and the ratchet plate 2 (FIG. 4).

Then, the pawl 19 rotatably provided on the pallet pallet 18 is pushed leftward by the portion 2b of the ratchet plate 2. As a result, the pallet 18 is pushed and rotated clockwise against the spring 20, and the iron piece 1
7 is in contact with the iron core 16 and is held by suction. At this time, the portion 18a of the pallet fork 18 enters into the teeth of the ratchet plate. The pallet pallet 18 is pressed down because the ratchet plate 2 is receiving a leftward force, and will not return counterclockwise due to the spring 20 receiving force from the magnet.

At this time, the key provided at the upper right end of the rack plate 3 is also hooked onto 18a of the ankle 18, and movement to the left is prevented.

On the other hand, when a release signal is applied to the CPU 102, the CPU 102 calculates the aperture value and shutter speed based on the digital output of the AD converter 101 and other information, and uses an electromagnetic driver 103 for controlling the aperture and a shutter time instruction circuit. It becomes possible to provide data to 104. After the state shown in FIG. 4 is formed, a pulse train as an aperture determining signal is supplied from the electromagnet driver 103 to the electromagnet coil 16a. The first pulse is 16a
When the iron core 16 is supplied with the iron piece 17, the iron core 16 loses its ability to attract the iron piece 17.

Then, the pallet 18 rotates counterclockwise (Fig. 5), and the portion 18a connects the ratchet plate 2 and the rack plate 3.
3b, allowing the rack plate 3 to move to the left. Due to this rotation of the ankle 18,
The pawl 19 also rotates counterclockwise and engages the next ratchet on the ratchet plate 2. The rack plate 3, which is allowed to run to the left, is moved to the left by the spring 6, and the pin 3a moves along the groove 3a of the rotation control plate 12, causing the rotation control plate to move counterclockwise. Thus, the rotation support frame whose movement was controlled by hitting 12 at section 8a becomes free. When the control of the pallet 18 is released, the ratchet 2 is moved to the left by the spring 5, pushing the pawl 19 connected to the ratchet 2 and turning the pallet 18 clockwise as described above, so that a current pulse is already generated. The iron piece 17 is pressed against the iron core 16, which has disappeared and is in a suctionable state, and is held by suction (FIG. 6). This allows ankle 1
The pawl 8 locks the ratchet plate 2. As mentioned above, between the aperture lever 1 and the ratchet plate 2,
Since the spring 4 is provided and is constrained by the pin 25 and is in a state of attraction between them, in this one pulse the diaphragm lever 1 also remains in the open position.

When the second pulse is applied, the pallet 18 separates from the ratchet 2, the pawl 19 connects to the ratchet tooth, and the pawl 19 moves to the left as the ratchet 2 moves to the left, causing the pallet to return and move by one tooth. will be carried out. The third and subsequent pulses similarly move one pitch at a time, and the movement of the diaphragm drive pin 206a following this causes the diaphragm to be driven by an amount corresponding to the number of pulses, and the diaphragm can be set in a short time.

FIG. 7 shows a state in which the aperture lever is driven to the minimum aperture value by the step drive as described above.

When the aperture value is set as described above, the motor 200, which has been in a stopped state, is rotated again in the second direction. Due to this rotation in the second direction, the rotation support frame 8 further moves counterclockwise from the position shown in FIG. 5, and the planetary gear 10 moves as shown in FIG.
It is connected to the gear 13 of the mirror set mechanism 205 and rotates the gear 13 counterclockwise. This rotation is 1
4a, 14, and 15 (see FIG. 2) are transmitted to the mirror disk 15 in this order, and a mirror (not shown) is raised.

When the raising of the mirror is completed, a signal indicating the completion of raising the mirror is sent from a switch (not shown) linked to the mirror to the CPU 102, and the motor 200 is stopped by a command from the CPU 102.
Further, in synchronization with the mirror rising, the leading curtain of the shutter 209 moves in advance, and the trailing curtain runs in response to a signal from the shutter time instruction circuit 104 to complete the shutter operation. When the shutter operation is completed, a signal is sent from the shutter 209 to the CPU 102, and according to a command from the CPU 102, the motor drive circuit 106 starts the motor 2.
00 in the first direction.

The rotation of the motor 200 in the first direction is transmitted to the film shutter charging mechanism via the first clutch 201 to start charging the film and shutter, and the rotation from the other output shaft in the first direction is transmitted to the film shutter charging mechanism. rotation is transmitted to the aperture setting mechanism 204 via the second clutch 200 (see FIG. 1).

Next, the charging of the aperture setting mechanism due to rotation in the first direction will be explained with reference to FIG. 7th
From the state shown in the figure, the gear 11 moves counterclockwise (motor 20
0), the planetary gear 9 rotates clockwise, the rotation support frame 8 rotates clockwise, and the planetary gear 10 separates from the gear 13 of the mirror setting mechanism. The planetary gear 9 rotates towards the rack plate 3. gear 10 is 1
3, the mirror (not shown) returns down by itself.

FIG. 8 shows a state in which the planetary gear 9 is connected to the rack plate 3, and the rack plate 3 is moved to the right by rotation of the gear 9 in the counterclockwise direction. When the pin 2a, which is set downwardly on the ratchet plate 2, is pushed by the right end of the rack plate 3, the ratchet plate 2 is also moved to the right. At this time, the pallet 18 is attached to the ratchet plate 2 as shown in FIG.
The iron piece 17 is separated from the iron core 16 by being pushed.
The pawl 19 is also pushed counterclockwise by the ratchet plate 2 against the spring 21. The aperture lever 1 moves to the right together with the ratchet plate 2 by the spring 4, and the aperture lever 206a on the lens side moves to the right.
move in the opening direction. Also, due to the movement of the rack plate 3, the pin 3a, which is planted downward on the rack plate and is connected to the groove 12a of the rotation control plate 12,
The rotation control plate 12 is rotated clockwise in cooperation with the groove 12a of the rotation control plate 12. The position of this rotation control plate is such that the planetary gear 10 is controlled not to be coupled to the gear 13 by the initial rotation of the motor 200 in the second direction. motor 200
When the rack plate 3 is further advanced by the rotation in the first direction, the planetary gear 9 and the rack plate 3 are disengaged from each other as shown in FIG. 1 is sent. When moved to this position, the pawl 19 moves from the position shown by the broken line to the position shown by the solid line, and the pawl 19 is removed from the ratchet plate 2.

FIG. 3 shows a state in which the aperture setting mechanism 204 has been completely set. Even after the setting of the aperture setting mechanism 204 is completed, the motor 200 continues to rotate in the first direction until the setting of the film and shutter is completed, and the planetary gear 9 continues to idle.

After all the settings are completed, the motor 200 is stopped.

FIG. 9 is a time chart summarizing the operation of the device described above.

After the camera is ready to take a picture (t ₁₂ ), as shown in FIG. 3, when the camera is released at time t ₁ , the motor 200 starts rotating in the second direction, and as shown in FIG. At the time (t ₂ ) when the rotation of the frame 8 is controlled by the rotation control plate 12, the motor 200 is stopped.

Application of pulses is started from time _t3 . Two examples are shown: one in which three pulses are applied and one in which pulses are applied until the final aperture is reached. When the aperture is determined, the motor 200 is rotated in the second direction (t ₇ ), and the shutter operation is performed from the time when the mirror has finished rising (t ₉ ). From the point in time ( _t10 ) when the shutter operation ends, the motor 200
rotated in the direction of

The setting process of the aperture setting mechanism 204 is shown in FIG. The aperture setting mechanism 204 is (t ₁₁ )
After completing the setting at this point, the shutter remains in the state shown in FIG. 3 until the shutter is released. All charges end at time (t ₁₂ ).

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the overall configuration of the motor drive device according to the present invention, Fig. 2 is a perspective view mainly showing the second clutch, and Fig. 3 is a diagram showing the second clutch etc. with the camera set. A plan view showing the state, Figure 4, shows the motor is in the second position due to the release.
Fig. 5 is a plan view showing the state of the second clutch when it starts rotating in the direction of , Fig. 5 is a plan view showing the state immediately after the first pulse is applied to the electromagnet, and Fig. 6 is a plan view showing the state after the pulse application has finished. FIG. 7 is a plan view showing the state in which the aperture is controlled to the minimum aperture value, and FIG. 8 is a plan view showing the state in which the aperture is controlled to the minimum aperture value.
A plan view showing a state in which the aperture setting mechanism is being set;
FIG. 9 is a time chart illustrating the operation of the apparatus according to the present invention. 1... Aperture lever, 2... Ratchet plate,
3...Rack plate, 4...Spring, 5...Spring, 7...
Sun gear, 8... Rotating support frame, 9, 10... Planetary gear, 11... Final gear of reduction gear train, 12...
...Rotation limiting plate, 13...Gear, 14...Bevel gear,
15...Mirror disk, 16...Iron core, 17...Iron piece, 18...Ankle, 19...Claw, 20...Spring, 21...Spring, 22...Pin, 25, 26...
... Pin, 100 ... Photoelectric element, 101 ... AD converter, 102 ... CPU, 103 ... Electromagnet driver, 104 ... Shutter time indication circuit, 106
...Motor drive circuit, 200 ...Motor, 2
01...First clutch, 202...Second clutch, 203...Film shutter charge mechanism, 204...Aperture setting mechanism, 205...Mirror setting mechanism, 206...Aperture, 207...Mirror, 208...Film winding Upper mechanism, 209...shutter, 210...electromagnetic ratchet device.

Claims (1)

[Claims] 1 In a motor drive device that drives the camera mechanism using a motor with two output shafts built into the camera, there is a winding mechanism that energizes the film and shutter, and a set rotational force that moves the camera from the minimum aperture direction to the maximum aperture position. an aperture setting mechanism that is set to a position and accumulates a return force in the direction of the minimum aperture; a mirror mechanism that has its own return force and is brought to the raised position by receiving rotational force; and a first output shaft of one of the motors. A first clutch transmits the rotation in the first direction to the hoisting mechanism as a hoisting rotational force, and the rotation in the first direction of the other output shaft of the motor is connected to the aperture setting mechanism, and the rotation in the second direction is connected to the aperture setting mechanism. A second clutch is connected to provide a rotational force that raises the mirror mechanism, and receives a number of control signal pulses corresponding to the determined aperture from an exposure control circuit, and is electromagnetically activated each time it receives one pulse for one tooth. an electromagnetic ratchet that allows the aperture mechanism to move by a number of teeth corresponding to the number of control signal pulses by moving the aperture mechanism; and an electromagnetic ratchet that rotates the motor in a second direction to raise the mirror mechanism; A motor drive device comprising a motor drive circuit that sets the aperture of the aperture mechanism, releases the shutter, and after the shutter operation is completed, rotates the motor in a first direction to perform winding.