Exposure control system
First Claim
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1. An exposure control system including:
- (a) electromagnetically operated shutter means operating under the action of an electromagnetic force and positioned to block and unblock light entering a photo-taking lens;
(b) a shutter drive circuit responsive to an actuating signal for opening, and, after a predetermined time, closing said electromagnetically operated shutter;
(c) means for setting a number of exposures;
(d) a counter or counting each time said electromagnetically operated shutter means is closed after a an actuating signal and for producing a closing signal upon having counted the predetermined number set by the exposure number setting means;
(e) a flip-flop circuit for holding said shutter drive circuit in an operative position from the time of the actuating signal to that at which said counter produces the predetermined signal; and
(f) a timer circuit for preventing actuation of said shutter drive circuit from the initiation of a closing of said electromagnetically operated shutter to the termination of the closing thereof.
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Abstract
A camera having an electromagnetically driven shutter provided with a counter capable upon counting a present number producing a signal. Each time the shutter is closed, the counted value is changed, while the period of actuation of the shutter is controlled to effect a predetermined fraction of an exposure, so that a continuous sequence of shots equal in number to that preset in the counter are taken automatically.
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Citations
25 Claims
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1. An exposure control system including:
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(a) electromagnetically operated shutter means operating under the action of an electromagnetic force and positioned to block and unblock light entering a photo-taking lens; (b) a shutter drive circuit responsive to an actuating signal for opening, and, after a predetermined time, closing said electromagnetically operated shutter; (c) means for setting a number of exposures; (d) a counter or counting each time said electromagnetically operated shutter means is closed after a an actuating signal and for producing a closing signal upon having counted the predetermined number set by the exposure number setting means; (e) a flip-flop circuit for holding said shutter drive circuit in an operative position from the time of the actuating signal to that at which said counter produces the predetermined signal; and (f) a timer circuit for preventing actuation of said shutter drive circuit from the initiation of a closing of said electromagnetically operated shutter to the termination of the closing thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An exposure control system operating in response to a release switch and the brightness of an object, comprising:
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(a) electromagnetically operated shutter means for operating in response to the action of an electromagnetic force as the driving source and positioned to block and unblock light entering through a photo-taking lens; (b) a shutter drive circuit for opening, and, after a predetermined time based on the brightness of the object causing said electromagnetically operated shutter to be closed; (c) a counter for counting each time said electromagnetically operated shutter means is closed after the release switch has been thrown and, upon having counted a predetermined number, producing a predetermined signal; (d) a timer circuit for intermittently actuating the shutter drive circuit, said timer circuit being arranged for preventing the actuation of the shutter drive circuit for a given time from initiation to finish of closure of the electromagnetically operated shutter means and for actuating the shutter drive circuit in an operative position; (e) a gate circuit for sustaining said shutter drive circuit in an operative position for a time from the throwing of the release switch to the release thereof; and (f) maintaining means for maintaining power to the exposure control system from the time of the release switch being thrown to the time the counter produces the predetermined signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification