Camera circuit arrangement for the pre-indication of exposure ti

Details Camera circuit arrangement for the pre-indication of exposure ti Camera circuit arrangement for the pre-indication of exposure ti

1975-05-16

1976-12-14

Peters, Jr., Joseph F.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354 60L, 356226, G03B 1718

Patent

active

039979040

ABSTRACT:
A circuit arrangement for the pre-indication of the exposure time to be expected in automatic mirror-reflex cameras in which the brightness of a controllable luminous element, which is constant for the duration of the exposure, is used for the illumination of the photo-receiver of the electronic time-formation system. The voltage dropping over the luminous element, which is proportional to the exposure time, is ascertained by means of a measuring mechanism. The luminous element is formed as luminous diode and in parallel therewith there is connected a current path containing the measuring mechanism fed from a constant current source for the compensation of the response voltage of the luminous diode and for the adaptation of the measuring mechanism to the characteristics of the luminous diode.

REFERENCES:
patent: 3470798 (1967-10-01), Miyakawa
patent: 3698298 (1972-10-01), Kikuchi et al.
patent: 3765312 (1973-10-01), Takishima

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