JPH0743492B2 - Electric drive for camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric drive device, and more particularly, to an electric drive device for a camera in which various operating members that control a photographing operation are driven by a motor.

(B) Prior Art In an electric drive device for a camera, there is an example in which a plurality of operating members that directly or indirectly control a photographing operation are performed by one motor, for example, a film winding motor. In this example, the shutter charge (so-called shutter set) and the focus ring of the photographic lens having an automatic focusing function are linked to the rotation of the motor that is rotated when the film is wound, The charging for driving from the in-focus position to the close side or the infinity side is performed simultaneously or in time series.

Then, by pressing the shutter release button halfway when shooting, the storage position (non-use position) can be manually set in advance.
The pop-up operation is performed by energizing the magnet based on the photometric information by the automatic exposure control circuit (hereinafter referred to as "AE control circuit") so that the strobe device stored in There is.

Then, the magnet holding the shutter charge at the time of the previous film winding is energized to be in the waiting state of the shutter operation.

After that, the magnet for unlocking the focus ring charged at the time of the previous film winding is energized, and the lock magnet is energized to lock the focus ring when a predetermined focused state is obtained.

Further, when the shutter release button is pressed deeply, the magnet for holding the shutter is energized to open the shutter. Then, based on the photometric information from the AE control circuit, the magnet for the shutter closing operation is energized to complete the film exposure, and the series of photographing sequences is completed.

However, in such a conventional electric drive device for a camera, a plurality of actuating members are charged by the driving force of a film winding motor and locked in the charged state. Therefore, a magnet for locking the shutter charge is used. Also, since it has a magnet that locks the shooting lens when it is driven to the in-focus state and a magnet that unlocks the strobe locked in the unused position and moves it to the used position, the cost increases and The power consumption also increases, and the battery life is shortened particularly in a camera in which the power supply battery voltage is limited to a small capacity of about several volts.

Further, a drive circuit for controlling the energization of the magnet is required, which is a problem in a camera that is strongly required to be downsized.

Further, a mechanical governor for slowly moving the photographing lens and a mechanical governor for controlling the shutter speed are required, and a switch for detecting the lens position and the like are also required, resulting in an increase in cost.

In addition, since a setting mechanism is required for driving each of the above-mentioned actuating members, the structure becomes complicated in this respect as well.

(C) Purpose The present invention has been made in view of the above circumstances, and an object thereof is to drive a strobe between a non-use position and a use position, to drive between an initial position of a photographing lens and a focus position, and to open and close a shutter. Each driving operation can be performed by rotation of one motor, and it is not necessary to use a magnet for holding the charged state of the operating member, a governor mechanism for buffering the operation, and the like compared to the conventional device of this type. An object of the present invention is to provide an electric drive device for a camera, which is simple, can reduce the cost, and can also simplify the circuit configuration of the control means for driving the operating member.

(D) Configuration In order to achieve the above object, the present invention is an electric drive device for a camera, in which various operating members that control a photographing operation are driven by a motor, and is rotationally driven by a forward / reverse rotation motor, and a cam, a pin, etc. are provided on an outer surface portion. A rotary drive plate having a plurality of drive parts, and a strobe that is driven by the drive part when the rotary drive plate rotates in a first direction from an initial position by a strobe and from a non-use position to a use position. A lens actuating member that is driven by the driving unit to move the photographing lens to the in-focus position when the actuating member and the rotary drive plate rotate from the initial position in the second direction opposite to the first direction by a predetermined amount. And a shutter that is driven by the drive unit to open and close the shutter when the rotary drive plate rotates from the initial position to the first direction and from the first direction to the initial position. And a control means for controlling the rotation direction and the rotation amount of the motor so that the rotation drive plate rotates in the first direction and the second direction with respect to the initial position. It is characterized by.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view showing the structure of an embodiment of the present invention, FIG. 2 is a perspective view showing the external structure of a camera to which the present invention is applied, and FIG. FIG. 4 is a perspective view showing a state in which the non-use position is rotated to the use position.
It is a front view which shows the structure of the Example shown in FIG.

1 to 4, a barrier 2 is provided on the front surface of the camera body 1 for preventing foreign matter such as dust from adhering to the front surface of the taking lens and deteriorating or damaging the optical performance.
Is provided so that it can be opened and closed in the left-right direction with respect to the front surface of the taking lens. Further, a barrier open command button 3 is provided on the upper surface of the camera body 1, and the barrier open command button 3 is arranged so as to interlock with a barrier open command switch 4 arranged in the camera body 1. . Further, a release button 6 is provided on the upper surface of the camera body 1, and this release button 6 has
A release switch 7 formed of the contact pieces 7a, 7b, 7c is provided. In this release switch 7, the contact piece 7a and the contact piece 7b are brought into conduction by pressing the release button 6 halfway and the contact piece 7a is further pressed by pressing the release button 6 deeply.
On the other hand, the contact piece 7b in the conductive state is configured to be conductive to the contact piece 7c while maintaining the conductive state.

In addition, in the upper right corner of the front of the camera body 1, at the time of shooting,
A strobe light emitting unit 5 of a pop-up type is provided.

As shown in detail in the perspective view of FIG. 3, the strobe light emitting unit 5 has a shaft 52 extending on the back side of a substantially rectangular-shaped light emitting unit body 51 in which a flash discharge tube and a reflecting member are housed. It is rotatably supported by the camera body 1 by an appropriate means.
A support pin 55 is provided on a part of the peripheral surface of 52. One end of the support pin 55 is supported by a spring hook 53 planted in the camera body 1, and the other end of the coil spring 54 is supported. ing. Then, the coil spring 54 causes the light emitting unit main body 51 to
It is biased clockwise about the axis 52. A lock recess 51a is formed at the lower end of the short side surface of the light emitting unit body 51. The lock recess 51a is rotatably supported by the immovable member and is locked by the lock piece 56a formed at the tip of the first arm of the strobe lock lever 56 having three arms. . A tension spring 57 is applied to the tip of the second arm of the strobe lock lever 56, and a clockwise biasing force is applied to the strobe lock lever 56. Further, a contact portion 56c is provided at the tip of the third arm of the strobe lock lever 56 so as to come into contact with an engaging portion 58a at the tip of the first arm of the strobe release lever 58 described later.

On the other hand, a charging control lever 61 for detecting a position of the light emitting unit main body 51 when not in use is provided rotatably with respect to an immovable member. A contact piece 61a that abuts the lower surface of the charge control lever 61 is formed, and the other end of the tension spring 63 whose one end is supported by the immovable member is hooked on the tip end of the second arm of the charge control lever 61 to control the charge. A clockwise biasing force is applied to the lever 61. Further, brushes 61b and 61c are attached to the tip of the second arm of the charge control lever 61, and the tips of the brushes 61b and 61c are the first electrodes formed on the substrate 62 for issuing a strobe charge command. 62a and the second electrode 62b are selectively short-circuited (see FIG. 4). That is, when the light emitting unit body 51 is in the non-use position (storage position), the charging control lever 61 is moved by the lower surface of the light emitting unit body 51.
Is rotated in the counterclockwise direction against the tensile force of the tension spring 63, and the brush 61b is in a state of breaking the contact with the first electrode 62a.

Further, when the light emitting unit main body 51 is at the use position (protruding position), the first and second electrodes 62a and 62b move toward the brushes 61b and 61b.
It is short-circuited to c and becomes conductive.

Here, as described above, the strobe release lever 58 for causing the strobe light emitting section 5 to project from the non-use position to the use position,
The component portion including the strobe lock lever 56, the coil spring 54, etc. is referred to as a strobe actuating member.

As shown in detail in the exploded perspective view of FIG. 1, the above-described barrier 2 is formed in a substantially rectangular shape, and a lower left corner portion thereof is provided with an operating piece 2a extending vertically downward. A tension spring 2b for urging the barrier 2 in the opening direction, that is, to the right in FIG. 1, is attached to a piece extending from the upper left corner of the barrier 2.

Further, a lock piece 8a of a barrier lock lever 8 to which a clockwise biasing force is applied by a tension spring 9 is engaged with an end surface 2c at the right corner of the barrier 2, and this barrier lock lever A drive shaft 10 driven by a cam surface 28, which will be described later, is planted at the tip of 8. Further, there is provided a barrier open detection lever 11 having an engaging portion 11a pushed at one end by the operation piece 2a when the barrier 2 is opened, and the other end of the barrier open detection lever 11 is rotated. A barrier open detection switch 12 is provided in the area, and the switch 12 is pressed by the other end of the barrier open detection lever 11 to be conductive when the barrier 2 is opened.

On the other hand, as shown in FIG. 1, an opening 1b for photographing is formed in a main plate 1a fixed to the camera body 1, and a fixed cylinder 17 is fixed to the upper part of the opening 1b. A focus ring 18, which does not move in the optical axis direction and is only rotatable, is fitted to the outer periphery of the fixed barrel 17, and the focus ring 18 is arranged at symmetrical positions on the upper surface thereof. At the same time, the focus cams 18a, 18b, 18c are formed so as to have a cam displacement corresponding to a predetermined focus drive amount.

Further, two guide grooves 17a, 17b along the optical axis direction are formed on the inner peripheral surface of the fixed barrel 17, and a lens frame 19 slidable in the optical axis direction with the guide grooves 17a, 17b as a guide. Are fitted.
A taking lens 20 is supported on the lens frame 19, and a flange portion formed on an upper portion of the lens frame 19 has a contact projection 19 for contacting each of the focus cams 18a, 18b, 18c.
a, 19b, 19c are formed.

Further, a lens pressing spring 21 is provided on the upper flange portion of the lens frame 19, and the lens pressing spring 21 abuts on the focus cams 18a, 18b, 18c, respectively.
Is constantly pressed to stabilize the contact state between the two.

A piece portion 18d protruding outward is formed on a part of the peripheral surface of the focus ring 18, and the rotation position of the piece portion 18d is restricted by the stopper pin 1c, and the focus ring is also made by the tension spring 22. A counterclockwise rotation biasing force is applied to 18. A focus driving piece 18e extending outward is provided on the peripheral surface of the focus ring 18, and saw tooth-shaped locking teeth 18f corresponding to the number of steps of the zone distance are formed. This locking tooth 18f has one end 23a of the first arm.
The lock claw 23b formed at the tip of the second arm of the focus lock lever 23, to which a clockwise rotational biasing force is applied by the tension spring 24 attached to the lock claw 23b, is engaged. Further, the tip end portion of the third arm of the focus lock lever 23 is provided with a rising piece 23c formed by bending the tip end upward.

On the other hand, the pulse motor 25 is fixed to the rear surface of the main plate 1a, and the output gear 26 fixed to the output shaft of the motor 25 is projected on the front surface of the main plate 1. The output gear 26 is the peripheral surface of the rotary drive plate 27. Meshes with the tooth surface formed on. This rotary drive plate 27
At the central portion of the upper surface of the cam surface 28 on which the drive shaft 10 is in sliding contact.
Is provided.

A drive pin 29 for driving the focus drive piece 18e is planted on the upper surface of the rotation drive plate 27 by rotating the drive plate 27 in the clockwise direction.

When the unlocking protrusion 30 on the rotary drive plate 27 rotates counterclockwise from the right side of the rising piece 23c, the rising piece 23c of the focus lock lever 23 is merely pushed upward. However, when the unlocking protrusion 30 on the rotary drive plate 27 rotates in the clockwise direction from the left side of the rising piece 23c, the rising piece 23c of the focus lock lever 23 moves toward the unlocking protrusion 30 side. The focus lock lever 23 is pushed by the
It is rotated counterclockwise against the tension spring force of the tension spring 24. Here, as described above, a functional portion that is driven by the drive unit (drive pin 29 in this case) on the rotary drive plate 27 to move the photographing lens from the initial position to the focus position is referred to as a lens operating member. .

Further, the rotation drive plate 27 has an engagement projection 31 which will be described in detail later.
And a step portion 32 for detecting the initial position of the rotary drive plate 27 is formed.

A sector lever 33 driven by the drive pin 29 is provided, and a driven portion 33a at the tip of the first arm of the sector lever 33 is driven by the drive pin 29. Further, a tension spring 33b is attached to the tip of the second arm of the sector lever 33, and a biasing force in the counterclockwise direction is applied to the sector lever 33, so that the tip of the third arm of the sector lever 33 is attached. The sector pin 34 extending downward in FIG. 1 is planted. The sector pin 34 can move in a guide elongated hole 1d formed in the base plate 1a. Above sector pin 34
Is fitted into the sector hole 1f of the two shutter blades 1e (only one shutter blade 1e is shown in FIG. 4 as a representative), and the driven portion 33a of the sector lever 33 is driven by the drive pin 29.
The opening 1b is opened by being pushed against the spring force of the tension spring 33b. Further, the tip of the third arm of the sector lever 33 presses the trigger switch 35, which is a leaf switch, at the position where the sector lever 33 rotates counterclockwise, and turns off when the shutter is fully opened.

As shown in FIG. 5, the engaging projection 31 provided on the rotary drive plate 27 has a lower slope portion 31a inclined upward and an upper slope portion 31b continuous with the lower end of the lower slope portion 31a. Each of the lower and upper sloped portions 31a, 31b is formed by an upright portion 31c and a horizontal portion 31d which are cut out at right angles above.

Above the engagement protrusion 31 having such a shape, the engagement portion 58b of the strobe release lever 58 described above is arranged in a state of being pressed downward by its own springiness. (See FIG. 6) An operating piece of a position switch 37 is engaged with the step portion 32 and is released when the rotary drive plate 27 is in the initial position so that the position switch 37 becomes conductive (short circuit). Has become.

The various switches of the camera according to the present embodiment configured as described above are connected to the CPU 100 as shown in FIG. 7, and the output from the CPU 100 is supplied to the pulse motor 25 described above via the driver 101. It is like this. Also, CP
An AE control circuit 102 and an AF control circuit 103 are also connected to the U100.

Next, the operation of this embodiment configured as described above will be described.

When the barrier open button 3 is pressed prior to photographing, the barrier open command switch 4 is turned on, this on signal is input to the CPU 100, and the pulse motor 25 is rotated by the pulse output of the CPU 100 via the driver 101. The rotary drive plate 27 rotates clockwise with respect to the initial position as shown in FIG. 8, and the drive shaft 10 rides on the large-diameter cam surface of the barrier lock release cam 28 and the drive shaft 10 is pushed. Then, the barrier lock lever 8
Rotates counterclockwise against the tensile force of the tension spring 9, and the lock piece 8a and the end surface 2c of the barrier 2 are unlocked. Therefore, the barrier 2 is moved to the right by the pulling force of the tension spring 2b, and when the barrier 2 is fully opened, the barrier open detection lever 11 is rotated clockwise by the piece 2a, and the barrier open detection switch 12 Is turned on.

In this way, the rotation driving plate 27 causes the unlocking protrusion 30 and the focus lock lever when the barrier 2 is opened.
The relationship between the rising piece 23 and the engaging projection 31 and the engaging portion 58b is as shown in FIG. 9 (B).
When the barrier open detection switch 12 is turned on, the on signal at this time is input to the CPU 100 shown in FIG.
The pulse motor 25 is rotated in the reverse direction, and the position switch 37 is turned off by the step 32 of the rotary drive plate 27. The OFF signal at this time is input to the CPU 100, and a stop signal is sent to the pulse motor 25 via the driver 101 by the output from the CPU 100, the pulse motor 25 is stopped, and the opening operation of the barrier 2 is completed. Focus lock lever 23 at this time
The rising piece 23c and the strobe releasing lever 58 are in the state shown in FIG. 9 (C).

When the barrier 2 is closed, it is closed manually. When the release button 6 is pressed halfway with the barrier 2 completely opened, the contact pieces 7a and 7b are turned on (short-circuited), and this ON signal is input to the CPU 100. Then, a drive signal is output from the CPU 100 via the driver 101, the rotation drive plate 27 is rotated counterclockwise by the pulse motor 25, and the engagement portion 58b of the strobe release lever 58 is generated.
In addition, the horizontal portion 31d of the engaging projection 31 shown in FIG. 5 moves to the right in the contact state. When the rotation driving plate 27 continues to rotate in the counterclockwise direction, the engaging portion 58b is pushed by the upright portion 31c of the engaging protrusion 31 [see FIG. 9 (D)]. Then, the strobe release lever 58 moves the tension spring.
It rotates clockwise against the pulling force of 60, and the contact portion 56c is pushed by the engaging portion 58a against the pulling force of the tension spring 57, and the strobe lock lever 56 rotates counterclockwise. The locking of the recess 51a by the lock piece 56a is released. Then,
The strobe body 5 is vertically erected (projected) in the clockwise direction by the stored force of the coil spring 54 to prepare for stroboscopic photography. Since the charge control lever 61 is rotated clockwise by the urging force of the tension spring 63 following the rising of the strobe main body 5, the first electrode 62a formed on the substrate 62 is formed.
Then, the second electrode 62b is turned on (short-circuited) by the brushes 61b and 61c. Then, the strobe charging is started by the operation of the CPU 100.

Then, the drive current is supplied to the pulse motor 25 via the driver 101 to drive the pulse motor 25, the rotation drive plate 27 rotates clockwise, and the drive pin 29 causes the drive piece 18e to pull the tension spring 22. The focus ring 18 is pushed against the force and rotates in the counterclockwise direction. Then, the focus cam 18a, 18b, 18c causes the lens frame 1
When 9 is fed (pushed up in FIG. 1), the focus is driven from the ∞ side toward the close side.

At this time, the AF control circuit 103 makes a focus determination, and when focus is achieved, the pulse motor 25 is de-energized and the motor 25 is braked. At this time, since the locking teeth 18f formed on the peripheral surface of the focus ring 18 are locked by the lock claws 23b biased by the tension spring 24, the in-focus state is maintained.

Then, in response to a command from the CPU 100, a drive current of reverse polarity is supplied from the driver 101 to the pulse motor 25, and the rotation drive plate 27 is reversely rotated (counterclockwise rotation) by the pulse motor 25 and returned to the initial position. The engaging portion 58b of the strobe releasing lever 58 is located below the lower slope portion 31a of the engaging protrusion 31 [see FIG. 9 (F)].

On the other hand, if the AE control circuit 102 determines that the flash photography is unnecessary, the pop-up drive is not performed. That is, in this case, the strobe main body 5 is not popped up by the half-pressing of the shutter release button after the barrier opening drive is performed, but the focus drive is immediately performed, but the rotation drive plate 27 is rotated clockwise. In the middle of the movement, that is, the driving of the focus, the engaging portion 58b of the strobe releasing lever 58 disengages from the horizontal portion 31d of the engaging protrusion 31 and is positioned below the engaging protrusion 31 as shown in FIG. 9 (E). Therefore, after the focus drive is finished, when the rotary drive plate 27 rotates counterclockwise and returns to the initial position, the engagement portion 58b of the strobe release lever 58 is provided with the engagement projection 31 of the strobe release lever 58. The state is in contact with the lower slope portion 31a [Fig. 9 (F)]. Therefore, even if the rotary drive plate 27 rotates counterclockwise during the opening operation of the shutter thereafter, the engaging portion 58b is
Since the engaging projection 31 is only pushed in the optical axis direction and the strobe release lever 58 is not rotated, the light emitting unit main body 51
Also, the storage position (non-use position) is maintained and the strobe is not charged.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, among the above-mentioned plurality of operating members, the barrier operating member that moves the barrier from the closed position to the open position is the pulse motor 25 that locks the barrier 2 that is biased and held in the opening direction in the embodiment. However, such an operation may be performed manually.

Further, the relationship between the rotation direction of the rotary drive plate 27 and the drive of each operating member is not limited to the example described above, and for example,
The barrier actuation member and strobe actuation member are
It may be operated by driving in the same direction. In this case, the barrier actuating member may be actuated by the initial amount of rotation of the rotary drive plate 27, and the strobe actuating member may be actuated when the rotary actuating plate 27 is rotated by a certain amount in the same direction. However,
The strobe actuating member and the lens actuating member are the rotary drive plate.
It must be actuated by driving in the opposite direction of 27. The reason is that if the AE control circuit 102 determines that strobe light emission is not required, the circuit is configured so that the pulse motor 27 is not rotated in order to prohibit the driving of the strobe operating member. If the rotation drive plate 27 is configured to drive the lens actuating member when it is rotated in the same direction as the strobe actuating member driving direction, the strobe actuating member is also driven in this process, and the strobe photographing mode is set. This is because it causes the inconvenience of being processed.

Further, the power source for rotating the rotary drive plate 27 is not necessarily the pulse motor 25, and may be, for example, a DC motor, but the pulse motor is used to accurately and quickly control the rotation angle. This is advantageous in that it is easy to carry out.

(E) Effects As is clear from the above description, according to the present invention, at least the strobe actuating member, the lens actuating member and the shutter actuating member are driven by one motor from the non-use position of the strobe to the use position. Magnet, an actuating member for spring-biasing and retaining the above-mentioned actuating member as in the prior art. Since it is not necessary to use a governor mechanism or the like for buffering the operation of the camera, the circuit is simpler by that amount, and the configuration is much simpler than the conventional device of this type, and the circuit power consumption can be greatly reduced. The electric drive device can be provided.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing the structure of an embodiment of the present invention, FIG. 2 is a perspective view showing the external structure of a camera to which the present invention is applied, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a perspective view showing the structure of the main part of the example, FIG. 4 is a front view showing the structure of the same embodiment, and FIG. 5 is a side view showing the engagement protrusion and the strobe release lever in the same embodiment in an enlarged manner. 6 and 6 are enlarged perspective views showing an example of a strobe release lever which is a part of the same embodiment, FIG. 7 is a circuit diagram showing an embodiment of an electric circuit according to the present invention, and FIG. FIG. 9 is a diagram for explaining the operation of the embodiment, and FIG. 9 is a diagram for similarly explaining the operation. 1 ... Camera body, 1e ... Shutter blade, 2 ... Barrier, 3 ... Barrier open command button, 4 ... Barrier open command switch, 5 ... Strobe light emitting part, 6 ... Release button, 7 ...
Release switch, 8 ... Barrier lock lever, 10 ...
Drive shaft, 11 …… Barrier open detection lever, 12 …… Barrier open detection switch, 17 …… Fixed cylinder, 18 …… Focus ring,
19 …… Lens frame, 23 …… Focus lock lever, 25…
… Pulse motor, 27 …… Rotation drive plate, 29 …… Drive pin,
30 …… Lock release projection, 31 …… Engagement projection, 32 …… Projection,
33 …… Sector lever, 35 …… Trigger switch, 37…
… Position switch, 51 …… Light emitting unit body, 56 …… Strobe lock lever, 58 …… Strobe release lever, 61 ……
Charge control lever, 100 ... CPU, 101 ... Driver, 102 ...
… AE control circuit, 103… AF control circuit.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G03B 9/08 F 7408-2K 11/04 B 7408-2K 13/34 15/03 J

Claims (1)

[Claims] 1. An electric drive device for a camera in which various operating members for controlling a photographing operation are driven by a motor, and the rotary drive plate is rotatably driven by a forward and reverse motor and has a plurality of drive parts including cams and pins on an outer surface thereof. A strobe actuating member for driving the strobe from the non-use position to the use position by driving the strobe when the rotation drive plate rotates a predetermined amount in the first direction from the initial position; To a second direction opposite to the first direction, the lens driving member is driven by the driving unit to move the photographing lens to the in-focus position when rotated by a predetermined amount; A shutter actuating member that is driven by the driving unit to open and close the shutter when rotating in the first direction and an initial position from the first direction; The first direction and the electric driving device for a camera, characterized by a second control means for controlling the rotation direction and the rotation amount of the motor so as to rotate in the direction relative to.