Automatic focus adjusting system

Details Automatic focus adjusting system Automatic focus adjusting system

1979-03-05

1980-11-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G03B 1320

Patent

active

042335035

ABSTRACT:
A system and method for automatically focusing a camera is disclosed wher the outputs of a conventional spatial image correlator are sensed to develop a distance signal corresponding to object distance. The position of the camera lens is sensed to develop a focus signal indicative of lens position. The ratio of the distance signal to the focus signal is determined and compared to a predetermined value. When that ratio varies from the predetermined value, the lens is automatically re-positioned until correspondence occurs between the predetermined value and the ratio of the focus signal to the distance signal.

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

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