Automatic focus adjusting device

Details Automatic focus adjusting device Automatic focus adjusting device

1984-10-31

1985-09-17

Perkey, William B.

354403, G03B 300

Patent

active

045417024

ABSTRACT:
Automatic focus adjusting device comprising a range finding means which generates a signal corresponding to a distance to an object to be photographed; means for setting a photographing lens to a position corresponding to the output signal from the range finding means; a primary judging means which judges whether or not a diaphragm setting is within the range in which fixed focus photographing is possible or not; and a secondary judging means which judges whether an output signal from the range finding means is at a level capable of operating an automatic focusing means, wherein the secondary judging means judges only when the primary judging means judges that a diaphragm setting is not within the range in which fixed focus photography is possible and the automatic focusing means is operated only when the secondary judging means judges the output signal is at a level capable of operating the automatic focusing means.

REFERENCES:
patent: 3618499 (1971-11-01), Harvey
patent: 3999192 (1976-12-01), Hosoe et al.
patent: 4199235 (1980-04-01), Matsuda et al.
patent: 4247187 (1981-01-01), Tamura

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