Patent
1975-02-18
1977-09-13
Adams, Russell E.
354 50, 354 60A, 354 60L, G03B 708
Patent
active
040486427
ABSTRACT:
An exposure time control device of an electric shutter includes a brightness-time conversion circuit for developing a single pulse having a width representative of the brightness of a scene to be photographed and a standard pulse generating circuit for generating pulses at a standard rate. A reversible counter counts the standard pulses for a period of time equal to the duration of the single pulse. Upon termination of the single pulse, a reversible counter control circuit applies control signals to the reversible counter to read-out the count stored therein for controlling the shutter exposure time. A delay circuit develops a trigger pulse upon opening of the shutter. The trigger pulse is applied to the reversible counter control circuit, and if it is applied prior to the termination of the single pulse, read-out of the count stored in the reversible counter is initiated prior to termination of the single pulse.
REFERENCES:
patent: 3677151 (1972-07-01), Werner et al.
patent: 3843249 (1974-10-01), Kitaura
patent: 3876876 (1975-04-01), Kitai et al.
TTL Cookbook, Don Lancaster, 1974, p. 208.
Designing with TTL Integrated Circuits, prepared by Texas Instruments Inc., 1971, p. 256.
Saito Takeo
Seki Youichi
Adams Bruce L.
Adams Russell E.
Burns Robert E.
Lobato Emmanuel J.
Seiko Koki Kabushiki Kaisha
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