JPS63264736A - Camera driving device - Google Patents

Abstract

PURPOSE:To pertinently transmit the normal and reverse rotations of a motor to a mirror mechanism, stopping-down mechanism and film winding mechanism with simple mechanisms respectively, by driving a diaphragm and mirror by utilizing the forward movement of reciprocating members from their initial positions in the directions, in which they are not engaged with a film winding means, and returning movement of the members from the initial positions and driving the film winding means by utilizing the returning movement of the members from the initial positions thereafter. CONSTITUTION:Stopping-down operations and mirror raising operations are performed by utilizing the forward movement of reciprocating members 4-8, 27, 29, and 30 from their initial positions and, on the other hand, diaphragm opening operations and mirror lowering operations are performed by utilizing the returning movement of the members 4-8, 27, 29 and 30 to the initial positions. In addition, film winding operations are performed while following up the returning movement of the members 4-8, 27, 29 and 30 from the initial positions without giving any influences to a diaphragm and mirror. Therefore, a load on a motor can be almost evenly born and the motor can be used efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving device for an aperture, a mirror, etc. in an eye reflex camera.

Conventionally, there are devices in which forward rotation of the motor performs a mirror-up operation and a narrowing down operation, and reverse rotation of the motor performs a mirror-down operation, an aperture opening operation, and a film winding operation.

However, the conventional device described above uses a one-way latch to transmit the forward rotation of the motor to the mirror mechanism and the aperture mechanism, and a one-way clutch to transmit the reverse rotation of the motor to the mirror mechanism, the aperture mechanism, and the film winding mechanism. I needed it. Therefore, it has the disadvantage that the mechanism is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide a camera drive device that can appropriately transmit forward and reverse rotation of the motor to a mirror mechanism, a diaphragm mechanism, and a film winding mechanism using a simple mechanism.

The example shown in FIG. 1 will be explained below.

In FIG. 1, a known slip mechanism 2 operates so that when an abnormal load is applied to the motor 1, slip occurs at this portion so that no load is placed on the motor 1. The rotational force of the motor 1 is transmitted to the rotating shaft 3 of the motor via the slip mechanism 2 . A worm 4 fixed to the shaft 3 is constantly engaged with a worm wheel 5, and performs a deceleration effect. When the shaft 3 rotates counterclockwise (in the direction of the arrow) in the figure, the worm wheel 5 rotates clockwise (in the direction of the arrow).

The shaft 6 is fixed to the worm wheel 5, and a first gear 7 is fixed to the center thereof, and a narrowing cam 8 is fixed to the tip thereof. A bottle 9 is in contact with the narrowing cam 8.

The narrowing lever 10 is rotatable about a shaft 11, and the bin 9 is fixed in the middle thereof. Therefore, the lever 10 swings in response to the lift of the cam 8.

A sector gear 12 is fixed coaxially and integrally with the lever 10. The pinion 13 is integrated with the gear 14 and constantly meshes with the sector gear 12. The gear 14 is always engaged with a pinion 15, and the pinion 15 is integrated with the claw portion 16 and the shaft 7. Therefore, the swinging motion of the lever 10 is magnified and transmitted to the claw portion 16.

Inside the lens 17, although not shown, a known aperture mechanism is included. When the aperture interlocking lever 18 is in the position shown in the figure, the aperture is open, and when it moves downward in the figure due to the biasing force of a spring (not shown), the aperture is narrowed according to the amount of movement. It has become. In other words,
Since the lever 18 is engaged with the tip 10a of the lever 10, as the lift of the cam 8 becomes smaller, the lever 10 rotates clockwise, and the lever 18 also moves downward in the figure. The aperture is narrowed down.

The lever 19 is rotatably supported by a shaft 20 and biased counterclockwise by a spring 25. The lever 19 is the claw part 1
9a, and when this claw portion 19a engages with the claw portion 16, rotation of the lever 10 is locked. Since the armature 21 attached to the lever 19 is attracted to the yoke 22 (normal state B), the lever 19 cannot be rotated counterclockwise. This attraction force is due to the magnetism of the permanent magnet 23, but when the coil 24 is energized, the attraction force of the permanent magnet 23 is reduced, so that the armature 21 separates from the yoke 22. As a result, the lever 19 is rotated counterclockwise by the biasing force of the spring 25, and the claw portion 19a and the claw portion 16 engage with each other. In addition, lever 1
A leaf spring 26 is attached to the tip of 9. When the chain plate spring 26 is pushed upward, the lever 19 rotates clockwise and the armature 21 is attracted again.

Next, the second gear 27, which is always in mesh with the first gear 7, has three holes 27a, 27b, and 27c for transmitting light. 28a is a light emitter such as an LED, and 28b is a photosensor. Sensor 28b and hole 27a, 27b or 2
The fact that any one of the 7Cs faces directly is detected and used for sequence control.

A shaft 29 is fixed to the second gear 27, a reset lever 30 is fixed to the middle thereof, and a crank 31 is fixed to the tip thereof. Worm 4 is counterclockwise (direction of arrow)
When rotating, the shaft 29 also rotates counterclockwise (in the direction of the arrow). A bottle 32 is fixed to the tip of the crank 31, and one end of a rod 33 is rotatably supported by the bottle 32.

The other end of the rod 33 is rotatably supported by a bin 34.

This pin 34 is fixed to the tip of a lever 36. A lever 36 integrated with the shaft 35 is rotatable about the shaft 35. The above shaft 29, crank 31, pin 32,
The rod 33, pin 34, lever 36, and shaft 35 constitute a lever crank mechanism. Therefore, when the shaft 29 is rotated in the direction of the arrow in the figure, the loft 33 moves upward and the lever 36 rotates counterclockwise.

The bottle 37 is fixed to a mirror holding frame 38, and this frame 38 is rotatably supported by a shaft 35.

A reflex mirror (not shown) is attached to the holding frame 38, and reflects the light that has passed through the lens 17 to a finder optical system (not shown). Side surface 36 of lever 36
A predetermined gap A is formed between a and the bottle 37.

A tension spring 39 is applied between the pin 37 and the bottle 34, so that the mirror holding frame 38 is biased clockwise (mirror downward direction). However, the lowering of the frame 38 is limited to a position where its tip 38a is locked by the support 50. When the lever 36 is rotated counterclockwise due to the rotation of the shaft 29 in the direction of the arrow, the side surface 36a and the pin 37 come into contact after the gapper is lost, and as a result, the lever 36 and the mirror holding frame 38 are rotated as a unit. It will rotate clockwise. Therefore, the mirror holding frame 38 can be retracted from the photographing optical path.

Next, the function of the reset lever 30 fixed to the middle of the shaft 29 will be described. Attach the tip 30a of the lever 30,
A cent bin 40 is fixed and is in a position that allows it to engage with the first arm 41a of the intermediate reset lever 41. A spring 42 is applied to the second arm 41b of the reset intermediate lever 41, and is biased so that the lever 41 returns to its initial position (the state shown in the figure) no matter which direction it rotates.

Further, the lever 41 is provided with a third arm 41c, which creates a predetermined gap B between it and the temporary spring 26 in the illustrated state. When the lever 41 is rotated counterclockwise, the leaf spring 26 and the third arm 41c first come into contact with each other.
After that, the lever 19 is rotated clockwise.

The other end 30b of the reset lever 30 is for restricting the rotation of the shaft 29 in the direction of the arrow, and this is achieved by the contact between the end 30b and the restriction 43.

Next, its operation will be explained.

FIG. 1 shows a state in which the camera is ready for photographing after winding the film and charging the shutter. Here, in conjunction with pressing the release button, release switch SW +
When turned ON, the motor 1 starts rotating counterclockwise by the action of the motor control circuit CI. Then warm 4
Then, the shaft 6 starts rotating clockwise via the worm wheel 5. As a result, the cam 8 integrated with the shaft 6 also rotates in the same direction, and the cam surface 8a of the cam 8 gradually reduces the lift relative to the pin 9. Furthermore, since the lever 18 is biased downward in the figure, it rotates clockwise.

The cam surface 8a is inclined until a minimum lift that is slightly smaller than the lift that gives the lens 17 the minimum aperture diameter is obtained, and is set so that the minimum lift continues in subsequent rotations. This is called the minimum lift region. The light passing through the lens 17 generates a photoelectric output in the light receiving element PD according to the aperture. When the output of the light receiving element PD corresponds to a predetermined aperture value determined by the film sensitivity and shutter speed, the control circuit C
t energizes the coil 24. Therefore, the attraction between the yoke 22 and the armature 21 is released, and the claw portion 19a engages with the model wheel 16, resulting in the pinion 15, the gear 14, and the pinion 1.
3. The lever 10 is locked via the sector gear 12. Therefore, a predetermined aperture value is set for the lens 17.

During such aperture value determination operation, the second gear 27 that meshes with the first gear 7 continues to rotate counterclockwise. Therefore, since the crank 31 also rotates in the same direction, the lever 36 starts rotating counterclockwise. However, in the lever crank mechanism at the bottom dead center, the rotation angle of the lever 36 is significantly smaller than the rotation angle of the crank 31. Here, it is assumed that the gap A is determined so that the mirror holding frame 38 is not moved during the above-described aperture determination operation. Therefore, since the mirror is not raised during the aperture determining operation, the amount of light entering the light receiving element PD is not adversely affected.

The longest time required for this type of aperture determination operation is
This is a case where the coil 24 is not energized unless the aperture is narrowed down to the minimum aperture diameter in the lens 17 or other interchangeable lens group. In the operation up to this point, the load on the motor is extremely small, so the shaft 6 rotates rapidly. However, in order to accurately determine the aperture value, it is necessary to rotate the lever 10 clockwise somewhat slowly. This is because it is necessary to engage the pawl portion 19a and the mold wheel 16 at a sufficiently stable timing to compensate for the response delay of the light receiving element PD, the control circuit C2, and the activation delay of the coil 24. Therefore, the enlarged gear train between gears 12 to 1G should have a sufficiently large inertia. Therefore, even if the cam 8 rotates rapidly, the lever 10 rotates at a moderate speed with a delay.

Therefore, when the cam 8 reaches the starting end of the minimum lift region, the motor 1 stops rotating and waits until the aperture value determination operation is completed.

The rotation stop signal 51g-1 is generated by detecting that the hole 27b provided in the second gear 27 and the sensor 28b are directly facing each other. For example, when the hole 27a and the sensor 28b are directly facing each other (at the start of the aperture determining operation), the hole 27b and the sensor 28b
Since two pulse-like photoelectric outputs are obtained from the sensor 28b until the sensor 8b directly faces the sensor 28b, it is sufficient to count these pulses. When the hole 27b directly faces the sensor 28b, a rotation stop signal 51g-1 is sent to the circuit CI, and as a result, the motor 1 is electrically braked and both the shaft 6 and the shaft 29 are stopped. However, as described above, the mirror holding frame 38 still does not move due to the gap A. The above is the operation from release to aperture value determination.

Next, begin the process of raising the mirror. Hole 27b and sensor 28b
When the lens faces directly and a rotation stop signal 51g-1 is sent to the control circuit C1, the timer circuit C1 starts and the time required to determine the minimum aperture diameter of all interchangeable lenses is the longest. After the time delay, the restart signal 51
Generate g-2.

When the signal 51g-2 is applied, the circuit CI energizes the motor 1. Therefore, the motor 1 starts rotating again in the direction of the arrow, and the shafts 6 and 29 also start rotating successively.

As the crank 31 rotates counterclockwise, the lever 36 continues to rotate counterclockwise. Finally, the gap A becomes zero, the pin 37 and the side surface 36a of the lever 36 come into contact with each other, and as a result, the mirror holding frame 38 is pushed up and retreated from the iris light path. Then, when the arm of the crank 31 is pointing substantially upward in the figure, the arm 30b of the reset lever 30 hits the limit 43, and the rotation of the shaft 29 is limited.

At this time, the hole 27c provided in the second gear 27 and the sensor 28b directly face each other. When this is detected, a restart signal 51g-3 is sent to the circuit CI, and the power to the motor 1 is cut off. During the restart of motor 1, cam 8 rotates, but with a minimum riff)
Since it is in the 9N range, lever 10 does not rotate. Then, when the motor 1 stops, it reaches the end of the minimum lift region. In this process, the reset pin 40 is inserted into the reset intermediate lever 41.
When the first arm 41a passes through, the intermediate lever 41 returns to the illustrated position by the biasing force of the spring 42.

In this way, the aperture is first narrowed down, and then the mirror is raised.

After this, a shutter (not shown) starts operating. This start signal may be a restart signal 51g-3 generated by the hole 27c of the second gear 27 and the sensor 28b, or may be a mechanical signal related to the movement of the mirror holding frame 38 or lever 36.

When the shutter closing is completed, the switch SWt associated with the shutter rear blade drive mechanism is turned on using a known method, for example.
The signal activates the circuit C3, causing the motor 1 to rotate in the direction opposite to the arrow in the figure.

After that, the mirror is lowered and the aperture is opened.

At this time, a film feeding system may be attached to the shaft 3 of the motor 1 via a one-way clutch, and the film may be wound by one frame at the same time as the mirror or aperture is returned. Alternatively, the shaft 3 may be provided with a clutch that can selectively switch between power transmission to the worm 4 and power transmission to the film feed system, and the film may be wound after the mirror is restored and the aperture is opened. .

Now, when the shaft 3 of the motor 1 starts rotating clockwise, the shaft 6 starts rotating counterclockwise via the worm 4 and worm wheel 5. Therefore, the cam 8 also starts rotating counterclockwise from the end of the minimum lift region, but since the cam surface 8a is at the minimum lift, it does not immediately act on the bottle 9, that is, the lever 10. On the other hand, since the first gear 7 also starts rotating together with the shaft 6, the second gear 27 also rotates clockwise. Therefore, the mirror is lowered by reversing the crank 31, lever 36, and mirror holding frame 38.

On the way, the reset pin 40 provided on the reset lever 30 engages with the first arm 41a of the intermediate reset lever 41, causing the lever 41 to rotate counterclockwise. Therefore, the third arm 41c of the lever 41 pushes the leaf spring 26 upward, and as a result, the lever 19 rotates clockwise and the armature 21 is pressed against the yoke 22 and attracted to each other by the magnetic force of the permanent magnet 23. Therefore, the claw 19a and the windmill 1
6 is released, and the enlarged gear train of gears 12 to 16 and the lever 10 can move freely.

On the other hand, as the reverse rotation of the crank 31 progresses and the tip 38a of the mirror holding frame 38 comes into contact with the holder 50, the frame 38
cannot rotate any further. Therefore, the lever 36 continues to rotate clockwise while pulling the spring 39, so that the gap A is created again. At this time of year, cam 8 is the minimum riff) 6
After passing the starting end of the N region, the lift gradually begins to increase, and the lever 18 is displaced upward in the figure via the lever 10. Therefore, the aperture of the lens 17 tends to be opened. If motor 1 continues to rotate further, reset lever 3
One end 30a of 0 hits the limit 43, and the rotation of the shaft 29 and shaft 6 is stopped.

Now, in the case of a configuration in which the film is fed during the above-described operation, the motor 1 is stopped when it is detected that the hole 27a of the second gear 27 faces the sensor 28b again. If the film is to be fed after the above operations, it is sufficient to detect the return of the shaft 6 to its original position and switch the aforementioned clutch to the film feeding side.

In this way, the mirror returns to the object observation position, the aperture of the lens 17 returns to its open state, and the aperture locking devices 16 to 25 also return to their original positions.

Next, only one embodiment of the invention will be described.

The above example had a simple mechanism, but in order to further shorten the shooting interval and expand the photo opportunities, motor 1 was added.
If the voltage applied to the motor 1 is increased, it becomes impossible to stop the motor 1 suddenly. Therefore, the pause between the focusing operation and the mirror raising operation becomes uncertain, and there is a possibility that the mirror will start to rise due to overrun, and the amount of light reaching the light receiving element will become inaccurate.

Therefore, in this embodiment, the mirror drive system is mechanically locked and the mirror drive system is allowed to operate again at a predetermined timing. Since its structure has much in common with the above-described example (those with the same reference numerals have the same function), it will not be described in detail, but will be explained in sequence in the explanation of the operation.

FIG. 2 shows this embodiment, and shows a case where preparation for photographing has been completed. When the release switch SWI is turned ON, the shaft 3 of the motor 1 starts rotating counterclockwise (in the direction of the arrow), and the worm wheel 5 rotates clockwise (in the direction of the arrow) via the worm 4. Furthermore, the cam 8 also rotates in the same direction via the shaft 6.

There is a protrusion 8b at the tip of the cam 8, which pushes one end 101a of the lever 101 when rotated clockwise. For this reason, the lever 101 should start rotating counterclockwise around the shaft 102 implanted in the key 104, but since the other end 101b of the lever is held down by the pin 103, the shaft 102 The entire key 104 to which it is attached is rotated counterclockwise around the shaft 105.

Therefore, the hook portion 104a and the pin 146 are disengaged. Further, since the cam surface 8a of the cam 8 is sloped so as to reduce its lift by clockwise rotation, the lever 100 can be rotated clockwise.

On the other hand, the lever 100 is biased clockwise about the shaft 116 by a spring 113, and the lever 100.
A spring 114 is hung between pins 9 and 107, which are respectively implanted in 108.

Therefore, levers 100 and 108 rotate integrally.

Further, the tip 108b of the lever 108 is engaged with the lever 18, and the lever 18 is operated by a spring built into the lens 17.
is subjected to a downward biasing force. Therefore, lever 10
0 starts rotating clockwise when the hook portion 104a comes off the pin 146. The rotational speed of the levers 100 and 108 is determined by the inertia brake 1 in order to obtain the aperture value determination accuracy.
17, the speed is suppressed to a slow speed. This inertia brake 11
7 is rotatably supported by a shaft 116, and a pin 106 implanted in the inertia brake 117 is connected to the lever 10.
0 is engaged with the lower end.

Therefore, the pressure of contact between the cam surface 8a and the pin 9 decreases to very little or zero, and the shaft 6 rotates rapidly.

On the other hand, since the first gear 7 provided in the middle of the shaft 6 and the second gear 27 are engaged with each other, the shaft 29 also rotates counterclockwise. However, the cam 1 fixed in the middle of the shaft 29
Since the protrusion 109a of 09 is locked to the tip 110a of the lever 110, the rotation of the shaft 29 and the shaft 6 is stopped. At this time, since the pin 111 provided on the second gear 27 turns on the switch 112, the power to the motor 1 is cut off by the action of the motor control circuit C3°, and the motor 1 is stopped. However, since the slip mechanism 2 is interposed between the motor 1 and the shaft 3, it is not necessarily necessary to cut off the power to the motor 1, and it is not necessary to turn off the power to the motor 1 when the shafts 6 and 29 are stopped. You can also leave it as it is to speed up the start of the next step.

Now, the clockwise rotation of the lever 100 continues during this time, and the aperture of the lens 17 gradually becomes smaller in diameter. The light passing through the lens is reflected by a mirror (not shown) and reaches the light receiving element PD. The control circuit C2 energizes the coil 24 when the photoelectric output of the photodetector pD has a predetermined relationship with the film sensitivity and shutter speed, or when it reaches a value corresponding to a desired aperture value. At this time, the magnetic force of the permanent magnet 23 is reduced, and the attraction between the armature 21 and the yoke 22 is released by the biasing force of the spring 25. Therefore,
The lever 19 to which the armature 21 is attached rotates counterclockwise, and the claw 19a at the tip locks the windmill 16. As a result, a wind turbine 16 and an enlarged gear train 13 connected thereto
~16. Stop 108a and lever 108. This means that the aperture value of the lens 17 has been determined.

To explain the enlarged gear train here, the lever 1080
A sector gear 108a is formed at the base and the binion 13
, the gear 14, the pinion 15, and the windmill 16, and the rotation angle of the lever 108 is expanded.

Therefore, the stopping error that occurs when the wind turbine 16 is locked with the claw 19a becomes extremely small when converted into the aperture value of the lens 17.

Now, the energization signal to the coil 24 is simultaneously applied to the motor control circuit C.
Applied to IO. As a result, the power supply to the motor 1 is restarted, but the shafts 6 and 29 are still unable to rotate due to the engagement of the cam 109 and the lever 110 described above. After the lever 108 is locked, only the lever 100 continues to rotate clockwise due to the urging force of the spring 113.
The pin 9 overcomes the tensile force and comes into contact with the minimum lift area of the cam surface 8. Immediately before this contact, the lever 100
A pin 115 implanted at the other end pushes the other arm 110b of the lever 110 diagonally upward to the left in the figure.

Therefore, the lever 100 rotates counterclockwise, and one end 110
a and the protrusion 109a of the cam 109 is removed, and the shaft 2
9 and shaft 6 resume counterclockwise rotation and clockwise rotation.

Note that in the above description, the resumption of energization of the motor 1 is performed at the same time as the energization of the coil 24, which may be related to the counterclockwise rotation of the lever 110. Of course, as mentioned above (if a system that does not interrupt power supply is adopted), the restart procedure is not necessary.

Now, when the shafts 6 and 29 start rotating again like this,
Cam 8 is in the minimum lift area in subsequent phases,
The aperture of the lens 17 does not move toward the open side again. On the other hand, when the cam 8 enters the minimum lift region, the lift of the charge cam 116 fixed to the shaft 29 begins to increase and the lever 118 is rotated clockwise via the roller 97. For this purpose, the spring 119 is charged by the pin 120 implanted in the lever 118. At this time, pin 121 is spring 1
19, one end 122a of the lever 122 to which the pin 121 is attached is pulled by the lever 12.
Since the lever 122 is locked with the key 123a of No. 3, the lever 122 does not rotate counterclockwise at this point.

As the rotation of the motor 1 progresses and the lift of the cam 116 increases, the pin 124 provided on the lever 118
The lever 123 is connected to the shaft 12 in order to push one end 123b of the 23.
The key 123a unlocks the lever 122 by rotating clockwise five times. Therefore, the lever 122 rotates counterclockwise due to the biasing force of the spring 119, and the arm 122b presses the pin 37 implanted in the mirror holding frame 38. Therefore, the mirror holding frame 38 rotates counterclockwise around the shaft 35, and the mirrors (not shown) rise together and retreat from the photographing optical path. Note that the shaft 35 is integrated with the lever 122 and the mirror holding frame 38
It is possible to rotate. In this process, a reset pin 40 is fixed to the lever 30 provided in the middle of the shaft 29, and as the shaft 29 rotates, the first arm 41a of the intermediate reset lever 41 is rotated clockwise around the shaft 125. After pin 40 has passed, spring 4
It returns to the illustrated position by the urging force of 2.

By the way, the mirror holding frame is provided with an arm 38b, and when the mirror has risen sufficiently, the switch 127 is turned on.
Turn off the power to the L motor 1.

The position where the mirror is sufficiently raised is the following position.

That is, a pinion 128 and a gear 129 are located above the slip mechanism 2 of the motor 1 and are integrated with the worm 4.
, a pinion 130, a gear 131, a pinion 132, and a gear 133. A film feed lever 134 is provided integrally with the gear 133 at the end of the reduction gear train.

When this tip 134a is locked with the lever 135, the mirror is at the complete raised position, and at this time the shaft 6.29 does not rotate any further. As described above, the aperture value is first determined, and then the process of raising the mirror is completed.

Next, the shutter starts operating. The shutter may be started by electromagnetic means in response to a signal from the switch 127, or may be started by a mechanical signal from counterclockwise rotation of the lever 122. After that, exposure is performed for a predetermined exposure time, and when the exposure is completed, a switch S associated with the shutter rear blade drive mechanism is
The motor 1 rotates clockwise in response to the ON signal W.

In connection with the reversal of the motor 1 or in connection with the exposure completion operation, the lever 136 is moved against the spring 138 to the shaft 13.
Rotate clockwise 7 times. Then, the notch 139a of the film feed plate 139 and the tip 136 of the lever 136
The engagement of a is released.

As the motor 1 reverses, the shaft 6.29 rotates in the opposite direction. In this case, the lift of the cam 116 becomes smaller, so that the lever 118 rotates counterclockwise. Then, due to the biasing force of the spring 119, the lever 118
Since the one end 118c and the one end 122a of the lever 122 are in contact with each other, the biasing force of the spring 39 causes the mirror holding frame 38 and the lever 122 to rotate clockwise.

Therefore, the tip 38a of the mirror holding frame 38 is connected to the holder 39.
Since the mirror hits the object and stops rotating, the mirror (not shown) has returned to the object observation position.

At the same time, the tip 122a of the lever 122 pushes away the key 123a of the lever 123 and rotates clockwise.

Therefore, since the spring 140 biases the lever 123 in the counterclockwise direction, the key 123a is attached to one end 12 of the lever 122.
2a is locked, and the lever 122 cannot be rotated counterclockwise.

Up to this point, the pin 40 at the tip of the reset lever 30
In order to rotate the first arm 41a of the reset intermediate lever 41 in the counterclockwise direction, the third arm 41c pushes the leaf spring 26 upward. Therefore, the lever 19 rotates to the right, and the armature 2
1 is attracted to the yoke 22. Therefore, the engagement between the claw 19a and the windmill 16 is released, and the enlarged gear train from the windmill 16 to the lever 108 is allowed to rotate. Further, as the shaft 6 rotates counterclockwise, the cam surface 8a pushes up the pin 9.
The cam surface 8a also contacts one end 101a of the lever 101, and rotates the lever 101 clockwise against the spring 141.

When the lever 100 returns to the position shown in FIG.
Since the cam 46 is locked to the hook portion 104a, the cam 8
Even if the lens 17 rotates counterclockwise, the lens 17 will not be retracted. In addition, since the protrusion 109a can overcome the one end 110a of the lever 110 against the spring 142, the shaft 29 can also rotate clockwise.

Furthermore, even if the cam 116 continues to rotate and the lever 118 rotates clockwise, the mirror will not move because the key 123a of the lever 123 locks the tip 122a of the lever 122.

This means that the mirror has returned to normal and the aperture has returned to its open aperture.

As a result of the reversal of motor 1 as described above, lever 1 is
Film advance lever 1 rotated until it came into contact with 35.
34 returns to the position shown. Then, the pin 143 implanted on the tip 134a of the lever 134 comes into contact with the protrusion 139b at the bottom of the film feed plate 139, so that they rotate together counterclockwise (in the direction of the dashed arrow). Start. A film feeding mechanism and a shutter charging mechanism (not shown) are linked to the film feeding plate 139, and during one rotation of the film feeding plate 139, the film is fed by one frame and the shutter is charged.

In the - direction, the biasing force applied to the lever 136 in the clockwise rotation direction is removed during shutter charging, and the lever 136 is moved by the spring 13.
Due to the urging force of 8, the outer peripheral portion 13 of the film feed plate 139
It comes into contact with 9c. Therefore, after the film feed plate 139 makes one positive rotation, the tip 136a falls into the notch 139a, the film feed plate 139 stops, and the shaft 6 and the shaft 2
9 will also all stop. At this time, the power supply to the motor 1 can be easily cut off by turning on the switch SW by utilizing the depression of the lever 136 into the notch 139a.

Note that during this film advance process, the film advance lever 1
34 comes into contact with the lever 135 during rotation in the direction of the dashed arrow, but no problem occurs because the lever 144 can be pushed aside against the spring 144 and passed through.

As described above, in the second embodiment, mechanical locking is performed after the aperture is stopped until the mirror starts to rise, and a mechanical delay is further provided to ensure the aperture determination. Therefore, stable aperture control can be performed even when the drive power source is at a high voltage or has large voltage fluctuations.

Note that the magnitude of the force driving the lever 1.00 changes depending on whether the aperture value controlled in this device is a large aperture or a small aperture. That is, when the diameter is set to a large diameter, the urging force supplied from the lever 18 out of the force driving the lever 10 is lost early due to the stoppage of the lever 108,
Conversely, if the diameter is set to small, it will be applied for a long time. Therefore, the engagement between the cam 109 and the lever 110 is released more quickly when the diameter is small. However, the biasing force of the lever 18 is generally sufficiently small, whereas the forces exerted by the spring 113 and the inertia brake 117 are large, so that the difference can be ignored in practice.

In each of the embodiments described above, the mirror lowering and the release of the diaphragm blocking are performed in parallel, but the invention is not limited to this. It may also be linked to winding for the next photograph. At this time, for example, the locked member 12 that is locked by the claw 19a in FIG.
- 16 may be separated from the aperture lever 10 so that they operate together when the aperture is narrowed down, but can be operated separately when the aperture is opened.

As described in detail above, in the present invention, the reciprocating member moves forward from the initial position to perform the narrowing down operation and the mirror up operation, while the reciprocating member moves back to the initial position to perform the aperture opening operation and the mirror down operation. conduct. When the reciprocating member further moves back from the initial position, the film winding operation is performed without affecting the aperture and mirror. Therefore, the load on the motor can be shared almost equally, and the motor can be used efficiently.

Further, as described above, the present invention drives the diaphragm and mirror by moving the reciprocating member from the initial position in a direction that does not engage the film winding means and by returning to the initial position, and then returns from the initial position. Since the film winding means is first engaged with the film winding means and driven by the motion, the mechanism for engaging and disengaging the film winding means and the motor is simple.

Furthermore, as described above (the driving of the diaphragm and the mirror is accomplished by the stroke of the reciprocating member moving forward from the initial position and the stroke of returning to the initial position, respectively, and the film winding operation is achieved by the reciprocating member further moving backward from the initial position). By sequentially repeating the forward movement of the reciprocating member from the initial position and the return movement to the initial position, the aperture and mirror can be driven without performing film winding operation.Therefore, multiple exposures, etc. It is possible to apply the present invention to cameras such as .), and it is very useful.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example on which the present invention is based, and FIG. 2 is a perspective view showing the only embodiment of the present invention. [Explanation of symbols of main parts]

Claims (1)

[Scope of Claims] A motor (1) capable of forward and reverse rotation; Reciprocating members (4 to 8, 27 , 29, 30, 116, 128-13
4) and; the diaphragm of the photographing lens is moved in the closing direction by the forward movement of the reciprocating member from the initial position, and the diaphragm is moved in the opening direction by the backward movement of the reciprocating member upon completion of exposure;
a narrowing means (100 to 108, 117) that keeps the throttle open regardless of the backward movement of the reciprocating member after the reciprocating member returns to the initial position; The forward movement raises the reflecting mirror, and the backward movement of the reciprocating member upon completion of exposure lowers the reflecting mirror, while the reciprocating member returns to its initial position. Mirror driving means (1) for keeping the reflecting mirror in a lowered state regardless of
18 to 125) and; While the reciprocating member is moving forward from the initial position and while moving back toward the initial position, the reciprocating member does not engage with the reciprocating member, and the reciprocating member is in the initial position. Film winding means (13) that engages the reciprocating member for the first time by the backward movement after returning and winds the film with the subsequent backward movement of the reciprocating member;
9) A camera drive device comprising: