Automatic exposure control circuit for a single lens reflex came

Details Automatic exposure control circuit for a single lens reflex came Automatic exposure control circuit for a single lens reflex came

1975-02-19

1976-08-17

Hix, L. T.

354 24, 354 31, 354 60R, G03B 708

Patent

active

039757463

ABSTRACT:
An automatic exposure control circuit for a single lens reflex camera of the TTL light measuring type in which light entering through an eyepiece, in addition to light entering through an objective lens, is compensated for accurate exposures of the film. The automatic exposure control circuit of the invention is characterized in that, even if the characteristics of the circuit components for the two measured values of light are not exactly identical with each other, predetermined correct shutter control characteristics can be obtained through the provision of voltage control means for trigger levels, by which arrangement, marked improvement is achieved from the view point of mass production.

REFERENCES:
patent: 3679905 (1972-07-01), Watanabe
patent: 3815148 (1974-06-01), Ikeda et al.
patent: 3836921 (1974-09-01), Mori
patent: 3863263 (1975-01-01), Itagaki
patent: 3866240 (1975-02-01), Tsujimoto

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