Light emission quantity control device for focus detection

Details Light emission quantity control device for focus detection Light emission quantity control device for focus detection

1986-08-04

1988-02-02

Wan, Gene

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354403, G01J 120, G03B 310

Patent

active

047230738

ABSTRACT:
In an automatic focus detecting device having a light projecting element for projecting light for focus detection onto an object to be photographed and a light receiving element for receiving the light reflected by the object, controls an imaging optical system moving to an in-focus position on the basis of an output signal of the light receiving element. The disclosed light emission quantity control device includes a counter for counting the light emission time of the light projecting element from the start thereof and increases the light emission quantity of the light projecting element after the lapse of a predetermined time counted by the counter.

REFERENCES:
patent: 4367027 (1983-01-01), Stauffer

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