Exposure control apparatus

Details Exposure control apparatus Exposure control apparatus

1975-11-12

1977-07-19

Hix, L. T.

354 60R, G03B 708

Patent

active

040372375

ABSTRACT:
An exposure control circuit that produces a variable exposure interval depending upon scene brightness or a constant exposure interval proportional to a predetermined scene brightness, by providing a photocurrent proportional to the level of actual scene brightness and a reference current proportional to the predetermined scene brightness and, preferably automatically, selectively integrating the photocurrent or the reference current depending upon the relative magnitude of the currents. The integrated current provides a signal to produce a variable exposure interval related to actual scene brightness when the photocurrent is greater than the reference current, or provides a signal to produce a constant exposure interval when the photocurrent is less than the reference current. The selective integration may be disabled to permit only the photocurrent to be integrated over all scene brightness and thus produce an exposure interval related to actual scene brightness beyond the predetermined brightness.

REFERENCES:
patent: 3673415 (1972-06-01), Yoshimura et al.
patent: 3860936 (1975-01-01), Harvey
patent: 3924263 (1975-12-01), Alessi
patent: 3961341 (1976-06-01), Numata et al.
patent: 3962708 (1976-06-01), Muramatsu

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