Low contrast default for auto focus system

Details Low contrast default for auto focus system Low contrast default for auto focus system

1980-12-05

1982-11-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G01J 136

Patent

active

043586759

ABSTRACT:
Apparatus for use with range finding equipment in which the radiation from a remote object may be too small to provide for proper operation. A signal which is a function of the logarithm of the ratio of the output of a first and second detector and a signal which is the function of the logarithm of the ratio of a third and fourth detector is compared with a reference signal. If the reference signal is larger than both of the other signals, the system operates to focus at a predetermined position.

REFERENCES:
patent: 4250377 (1981-02-01), Wilwerding
patent: 4309603 (1982-01-01), Stauffer

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