Digital exposure time control circuit with self-timer

Details Digital exposure time control circuit with self-timer Digital exposure time control circuit with self-timer

1975-02-14

1977-04-19

Hix, L. T.

354 50, 354238, G03B 708, G03B 964

Patent

active

040191893

ABSTRACT:
A digital exposure time control circuit including a standard pulse generating circuit for developing standard rate pulses which are applied under control of a brightness-time conversion circuit to a dividing circuit, and subsequently counted in a reversible counter operating in a counting mode. The number of standard pulses counted are controlled by the brightness-time conversion circuit to be proportional to an exposure time, and the counted pulses are subsequently read-out from the counter to control exposure time. The exposure time control circuit also includes a self-timer control circuit which is responsive to a predetermined number of counted pulses to clear the reversible counter, and enable the brightness-time conversion circuit when the number of counted pulses exceeds the predetermined number in order to develop a delay time, determined by the predetermined number of pulses to which the self-timer is responsive, before the start of counting the pulses for controlling exposure time.

REFERENCES:
patent: 3641902 (1972-02-01), Kikuchi et al.

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