Automatic focusing adjustor device

Details Automatic focusing adjustor device Automatic focusing adjustor device

1980-05-16

1982-02-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G03B 1320

Patent

active

043160859

ABSTRACT:
Automatic focusing adjustor device provided with a focusing sensor signal corresponding to an object distance by photoelectrically comparing an optical image obtainable through a fixed mirror and another optical image obtainable through a movable mirror wherein when the focusing sensor signal is not obtained, two steps of distance adjustment may be made by an output signal from a brightness sensor circuit for use in sensing a brightness of the object.

REFERENCES:
patent: 4174892 (1979-11-01), Osawa

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