Motor driven photographing control circuit

A motor driven photographing control circuit comprising;

• 1. a motor drive device including an interval timer which produces a photographing start signal in a preset cycle, and, at least, a film winding circuit which controls a shutter charging action;
• 2. a camera which begins an exposure control action in response to the photographing start signal from the interval timer, the camera including;
• a. a photometric circuit which produces an output corresponding to the brightness of a photographing object;
• b. a source of shutter time information having a shutter time value which corresponds to a length of time obtained by subtracting a length of time required for the action of the film winding circuit from the length of the cycle time of said interval timer;
• c. a shutter control circuit which controls a shutter;
• d. a connecting means for selectively connecting the photomeric circuit and the shutter time information source to the shutter control circuit;
• e. a shutter time computing circuit for computing a shutter time based on an output of the photometric circuit;
• and
• f. a discriminating circuit connected to the connecting means, the discriminating circuit being arranged to produce an output when the shutter time computed by said shutter time computing circuit is longer than the shutter time value of said shutter time information source, the output being transmitted to the connecting means, which then, in response to the output, connecting the shutter time information source to the shutter control circuit.

A motor driven photographing control circuit including a motor drive device which repeats a shutter releasing action for a camera having a stop preference function and a shutter time controlling function and which also repeats at least a shutter charging action through a film winding means, the motor driven photographing control circuit comprising;

• a. a shutter release cycle controlling means which produces a first signal for the shutter releasing action in a preset cycle to control the shutter release to be made in the preset cycle according to the signal;
• b. a shutter time signal forming circuit which produces a second signal corresponding to a shutter time being controlled by said camera;
• c. a shutter release cycle time signal forming means which produces a third signal corresponding to the cycle time of the first signal, the cycle time signal forming means being connected to the shutter release cycle controlling means,
• d. a discriminating circuit which is connected to the shutter time signal forming circuit and to the shutter release cycle time signal forming means to produce an output when the second and third signals come to be in a preset relation to each other;
• and
• e. a display circuit which produces a warning in response to the output of the discriminating circuit.

A motor driven photographing control circuit comprising;

• 1. a photographing operation controlling means which produces a photographing operation start signal;
• 2. a photomeric circuit which measures the brightness of a photographing object in response to the photographing operation controlling means;
• 3. a shutter control circuit which controls a shutter time based on the output of the photometric circuit;
• 4. a film winding control circuit which performs at least a film winding action, the winding control circuit being arranged to operate at least in response to a shutter control action completion signal produced by said shutter control circuit;
• 5. a cycle signal forming circuit which is connected to the photographing operation controlling means and produces a first signal in a preset cycle, the photographing operation controlling means producing the photographing operation start signal in response to the first signal;
• 6. a shutter time signal fomring means for producing a second signal which correspond to the shutter time controlled by the shutter control circuit;
• 7. a cycle time signal forming circuit which is connected to the cycle signal forming circuit to produce a third signal corresponding to the preset cycle time;
• 8. a discriminating circuit which is connected to the cycle time signal forming circuit and to the shutter time signal forming means to produce an output when the second signal comes to be in a preset relation to the third signal;
• and
• 9. a display circuit which makes a display in response to the output of the discriminating circuit.