JPH08227095A - Motor drive device for photographic camera - Google Patents

Abstract

PURPOSE: To attain the reduction of the number of a mechanical mechanism, the reduction of a fault and the improvement of operability by processing the control of the winding and rewinding or the like of film by an electrical circuit. CONSTITUTION: A state detecting means 16 detects the existence of a film cartridge and the opening/closing of a back cover. A motor driving means 2 drives a motor winding and rewinding the film. An initial winding actuation circuit 1 winds the film to a first exposure position by the half-press of a shutter release. Also, a film counter 14 counts the film. Then, a count pulse signal generating circuit 15 responds to the driving signal of the motor, the output signal of the state detecting means 16 and the travelling detection switch 19 of the film, and gives a count pulse signal to the film counter 14. Also, an operation mode deciding means 7 responds to the output signal of the state detecting means 16, the count pulse signal of the count pulse signal generating circuit 15 and a motor driving signal, and decides the operation mode of the motor. Furthermore, a film moving direction deciding circuit 10 decides the travelling direction of the film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive device for winding and rewinding a film of a photographic camera used for photography by using a motor.

[0002]

2. Description of the Related Art Recently, some photographic cameras have a motor for winding and rewinding a film. In this type of camera, when shooting is completed, the shooting is automatically completed by pressing the shutter button. The film is rewound, and when the final frame number is shot, the film is automatically rewound and the operation is easy.

[0003]

However, in order to wind the film to the shooting start position after loading the film, the operation of pressing the shutter button must be repeated several times while observing the frame number display. However, the operation is not complicated, and the completion of shooting the final frame is detected mechanically by detecting the difference in the pulling force of the film, which requires a mechanically complicated mechanism. There are problems such as a breakdown due to the device and an increase in the size of the device.

[0004] The present invention solves the problems of the conventional apparatus, and controls the film winding and rewinding with a small number of mechanical mechanisms. An object is to provide an excellent motor drive device.

[0005]

In order to achieve the object of the present invention, a motor drive device of the present invention comprises a state detection means for detecting the presence or absence of a film cartridge and opening / closing of a back cover.
Means for driving the motor that winds and rewinds the film, initial winding operation circuit that winds the film to the first exposure position by pressing the shutter release, film counter that counts the film, motor drive signal and status detection A count pulse signal generation circuit that responds to the output signal of the means and the film running detection switch to give a count pulse signal to the film counter, an output signal of the state detection means, a count count pulse signal of the count pulse signal generation circuit, and a motor drive In response to the signal, it mainly comprises a means for determining the operation mode of the motor, and a circuit which is operated by the output signal of the operation mode determination means and determines the traveling direction of the film.

[0006]

1 is a block diagram showing an embodiment of a motor drive device for a photographic camera according to the present invention, which will be described below in accordance with an operation mode of the motor drive. (1) When the patrone is not inserted or when the back cover is released When the shutter release is fully pressed, the photographing operation by opening and closing the shutter ends, and the photographing end signal A generates the winding start circuit 1
, The winding start circuit 1 operates and a film winding drive signal is sent to the motor control circuit 3 in the motor driving means 2 for controlling the rotation of the motor, and the output signal from the motor control circuit 3 The motor drive circuit 4 operates, and the motor 23 rotates in the direction of winding the film.

By the way, when the film cartridge is not inserted or the back cover is opened, the normal filming operation is not performed. Even if the shutter release is fully pressed and the motor rotates, the film winding operation does not require a battery. In order to avoid excessive wear, the shorter the rotation time of the motor required for the hoisting operation, the better. When the cartridge is not inserted or when the back cover is opened, both the cartridge detection switch 17 and the back cover detection switch 18 in the state detection means 16 such as the cartridge and the back cover are in the OFF state or one of them is OFF. The state of each switch is considered, and the state of each switch is input to the AND circuit 21, and the output signal from the AND circuit 21 is input to the mode time discrimination circuit 8 in the film winding and rewinding operation mode determining means 7. To be done.

On the other hand, the winding drive signal is also input to the reset signal generation circuit 5 by the operation of the motor control circuit 3 to operate the reset signal generation circuit 5, and the output signal from the reset signal generation circuit 5 causes the film to move within a predetermined time. The count pulse detection circuit 9 that detects the presence or absence of the count pulse signal from the count pulse signal generation circuit 15, which is a circuit that generates the count pulse signal by running, operates. In this case, since the film does not run, the output signal from the count pulse detection circuit 9 is applied to the mode time discrimination circuit 8, so that the mode time discrimination circuit 8 operates in accordance with this operation mode depending on the output signal of the AND circuit 21. The motor drive time is determined, and the determination signal is applied to the motor control circuit 3 in the motor drive means 2.

Therefore, when the cartridge is not inserted or when the case back is opened, the motor winding time is limited to the shortest by the mode time discrimination circuit 8 and the motor 23 rotates for a short time. Based on the time discrimination by the motor time discrimination circuit 8, the hoisting drive signal from the hoisting start circuit 1 applied to the motor control circuit 3 is cut off, and the motor 23 is not supplied with the rotational drive signal for hoisting.
The motor stops.

When the hoisting drive signal is stopped, the reverse rotation braking signal generation circuit 6 is activated to generate a motor drive signal in the direction opposite to the direction in which the motor 23 was rotating, and this signal is sent to the motor drive circuit 4. The voltage is applied to the motor 23 for a preset time, and the motor 23 suddenly stops rotating. While the reverse rotation braking is being applied to the motor 23, the reverse rotation braking signal is applied to the reset signal generation circuit 5 through the reverse rotation braking signal generation circuit 6 and the motor control circuit 3 instead of the winding drive signal. When the application of the reverse rotation braking signal is finished, the reset signal generation circuit 5 generates a reset signal to reset the count pulse detection circuit 9, and at the same time, the reset signal is also applied to the winding start circuit 1 to reset it.

(2) Initial film winding operation after closing the back cover In this operation mode, the film portion exposed at the time of loading the film is wound on the film winding device (winding spool), and the first unexposed film is wound. The film is wound up in a position that allows minute shooting. When the detection switch 18 is turned on by closing the back cover, the reset of the set / reset-flip-flop 22 (hereinafter referred to as SR-FF) is released.

In this state, when the shutter release button (not shown) is actuated to give a release-depressing signal B, which is applied to the SR-FF 22, the output of the Q terminal thereof is inverted, and the film moving direction determining circuit 10 is provided. The initial film winding operation circuit 11 and the initial film counter 13 in the counting means 12 for counting the number of film frames are activated. When the initial winding operation circuit 11 is activated, a winding drive signal is output from here and is applied to the motor control circuit 3. As described above, the motor 23 rotates in the film winding direction to wind the film. . When the film is wound up by the rotation of the motor 23,
The running detection switch 19 for detecting film winding detects one frame of film advance. This switch detects one frame of exposure by moving eight perforations 25 of the film as shown in FIG. 2, for example. The contact terminals 28 and 29 are connected to each other via a conductive portion 27 provided on the rotating member 26 which is rotated once, and detects one frame of film feed.
It is installed at the place where the film passes.

When the film running detection switch 19 is turned on, an H level signal (normally referred to when the logic symbol is high) is input to the AND circuit 20, and the AND circuit 20 outputs the H level signal. Since the signal and the H level signal from the reset signal generation circuit 5 are input, the AND circuit 20 outputs the H level and applies it to the count pulse signal generation circuit 15, and the count pulse signal generation circuit 15 outputs the film count pulse. A signal is generated, and this count pulse is generated each time the film running detection switch 19 is turned on.

This count pulse signal is applied to the initial film counter 13 in the active state, where it is counted. The initial film counter 13 outputs an initial winding end signal when the first portion of the unexposed film is counted by a prescribed number of film frames, for example, two frames until exposure becomes possible, and this signal is used for initial winding operation. Circuit 11
Is applied to the motor 23 to stop the winding drive signal output from the initial winding operation circuit 11 to the motor control circuit 3, and the motor 23 stops rotating as described above.

The initial winding end signal issued from the initial film counter 13 is also applied to the film counter 14 to activate the film counter 14, and at the same time, the count display here indicates the number of exposure start frames, such as S or 1, for example. Display. The above is the film initial winding operation, but if the film cannot be mounted correctly and fails, and the film does not run, the count pulse signal generated by the count pulse signal generation circuit 15 is Since the voltage is also applied to the count pulse detection circuit 9, the film is not wound if the count pulse does not exist within the prescribed time set in the count pulse detection circuit 9, so the count pulse detection circuit in this case The mode time discriminating circuit 8 is actuated by the output signal from the motor 9 to select the time that is in the mode, and after the selected time has elapsed, a hoisting drive stop signal is output to the motor control circuit 3, and the motor control circuit 3 outputs the motor. The drive signal is stopped and the motor 23 stops rotating.

(3) Film winding operation for each frame This operation is a film-up operation for each frame by photographing after the initial film winding operation, and the shutter is opened and closed by pressing the shutter button from the middle press to the end of shooting. In response to the photographing end signal A, the winding start-up circuit 1 is activated, and a winding drive signal is output from this, and the motor 23 rotates in the winding direction as described above.

The rotation of the motor 23 is transmitted to a film take-up spool (not shown) and a sprocket (not shown), the film is wound up, and the running of the film is detected by the film running detection switch 19 as described above. When one frame is detected, a count pulse signal is generated from the count pulse signal generation circuit 15 and applied to the film counter 14 in the active state, where the number of film frames is counted.

This count pulse signal is also sent to the winding start-up circuit 1 at the same time, and this circuit is reset to stop the generation of the winding drive signal from here, so that the motor 23 of the reverse braking signal generation circuit 6 is stopped as described above. The rotation suddenly stops in cooperation with the work. When the motor drive signal from the motor control circuit 3 stops, a reset signal is generated by the reset signal generation circuit 5, whereby the release full-press circuit (not shown) is reset to prepare for the next photographing.

(4) Film rewinding operation When the filming of the final frame is completed by repeating the filming operation and the film winding operation of one frame, the motor drive signal is generated from the winding starting circuit 1 as described above, and the motor 23 is driven.
Tries to rotate the film in the winding direction, but since the end of the film is fixed in the cartridge as is well known, the motor 23 cannot rotate and the film naturally does not run.

In this case, since the film running detection switch 19 is not turned on, the count pulse signal generating circuit 1
5 does not generate the count pulse signal, while the count pulse detection circuit 9 operates by the winding drive signal.
However, since the count pulse signal is not detected within the specified time, a film rewind drive signal is output from the mode time discriminating circuit 8 and applied to the film moving direction determining circuit 10.

Then, a film rewinding drive signal is generated from the film moving direction determining circuit 10, and the motor control circuit 3
Is applied to the motor drive circuit 4 to stop the hoisting drive signal, and the rewinding drive signal is applied to the motor drive circuit 3 instead, so that the motor 23 rotates in the opposite direction. When the motor 23 rotates in the reverse direction, the rotation shaft (not shown) of the camera body, which is engaged with the film take-up shaft (not shown) of the patrone, is well-known by the gear system (not shown) of the motor. Is rotated in the direction of rewinding into the patrone, and the film is rewound on the film take-up shaft in the patrone.

When the film is rewound, the film running detection switch 19 detects the film running at the same time as the film is wound, and the count pulse signal generating circuit 15 outputs the count based on the ON / OFF operation of the film running detection switch 19. The winding start circuit 1 is reset by the pulse signal and the winding drive signal is stopped. On the other hand, the film rewinding drive signal from the film moving direction determination circuit 10 switches the film counter 14 to the down-counting operation to generate the count pulse signal. Circuit 15
Each time the count pulse signal from is applied, the count counted by winding is decreased.

(5) Completion of film rewinding When the film rewinding operation is completed and the film is wound into the cartridge, the film running detection switch 19 is turned off, and the count pulse signal generating circuit 1
The count pulse signal is not generated from 5, and the count pulse signal is not applied to either the film counter 14 or the count pulse detection circuit 9.

When the count pulse detection circuit 9 stops applying the count pulse signal, the count pulse detection circuit 9 detects the count pulse to operate the mode time discrimination circuit 8 and output a rewinding completion signal after a predetermined time. Then, the rewinding drive signal applied from the film moving direction determining circuit 10 and issued from the film moving direction determining circuit 10 is stopped, the rewinding completion signal is output, and the motor 23 stops rotating.

The film rewinding completion signal is reset by opening the back cover. That is, since the film moving direction determination circuit 10 is reset by the SR-FF 22 by opening the back cover, the other initial winding operation circuit 11, the initial film counter 1 by the SR-FF 22.
Similarly, 3 is reset.

[0026]

As described above, in the motor drive device of the present invention, since the control of film winding and rewinding is performed by an electric circuit, integration is possible and film loading to the first frame can be performed. The initial winding can be performed without a visual check of the count simply by receiving a start signal, and the photographing of the final frame is detected mechanically and electrically, so the mechanism can be simplified and the number of failures can be reduced. Excellent operability,
In addition, a stable motor drive device can be provided.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of a motor drive device of the present invention.

FIG. 2 is a plan view including a partial cross-sectional view of an embodiment of a film running detection switch mechanism.

Claims (1)

[Claims] 1. A reversibly rotating motor for running a film, a winding start circuit for applying a film winding drive signal when a shutter release is fully pressed and a photographing end signal by opening and closing a shutter is applied, and the winding drive signal or A motor drive means for reversibly driving the motor in response to a rewinding drive signal, a state detection means for detecting the open / closed state of the back lid of the camera, and loading of a film cartridge, and the state detector means for detecting the cartridge. And a count pulse signal generation circuit for generating a count pulse signal by receiving an output signal from the motor driving means when the loading of the back cover and the closing of the back cover are detected and the film running is detected. And a film counter for counting the number of frames of the film,
An initial winding operation circuit that generates a motor drive signal for winding the film to an exposure start position in response to the output of the film counter and applies the motor drive signal to the motor drive means;
The motor drive means is driven by the output signal of the motor drive means to rotate the motor so that the rotation time of the motor becomes short when the count pulse signal is not applied during the operation of the initial winding operation circuit. Generates and gives a signal to stop, generates a rewind signal when the count pulse signal is no longer applied when the film is wound when the initial winding operation circuit is not operating, and the count pulse is used when the film is rewound. An operation mode determining means for applying a stop signal to the motor driving means to stop the reverse rotation of the motor when the signal is no longer applied, and the rewind signal is applied to reverse the motor to reverse the film. A photographic camera having a film drive direction determining circuit for giving a reverse drive signal of the motor to the motor drive means. Of the motor drive unit.