Low contrast bias auto focus system

Details Low contrast bias auto focus system Low contrast bias auto focus system

1979-11-30

1981-02-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G01F 120

Patent

active

042503779

ABSTRACT:
A low cost auto focus system employing a bias signal source to cause the system to focus at the infinity or hyperfocal distance when very low contrast conditions exist.

REFERENCES:
patent: 4085320 (1978-04-01), Wilwerding

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