Automatic focusing device

Details Automatic focusing device Automatic focusing device

1985-10-01

1989-02-07

Perkey, W. B.

354403, G03B 300

Patent

active

048035076

ABSTRACT:
The disclosed automatic focusing device measures distances by repeatly illuminating an object to the photographed with an auxiliary light. Upon detection of an in-focus state, either the auxiliary light illumination is inhibited or the auxiliary light driving cycle is made longer than the cycle used in a de-focus condition, so that the waste of electric energy is minimized.

REFERENCES:
patent: 3442193 (1969-05-01), Pagel
patent: 4410261 (1983-10-01), Masunaga et al.
patent: 4531157 (1985-07-01), Ishikawa
patent: 4542970 (1985-09-01), Suzuki et al.

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