Auto-focus camera

Details Auto-focus camera Auto-focus camera

1987-03-11

1989-01-03

Adams, Russell E.

354402, G03B 300

Patent

active

047960442

ABSTRACT:
An apparatus emitting a radiation, scanning the emitted radiation and driving a photo-taking lens to the in-focus position in accordance with the outputs of a plurality of light-receiving elements for receiving the radiation reflected by the object field includes preparation means for preparing an output signal variable in conformity with the scanning, on the basis of the outputs of the plurality of light-receiving elements, first comparison means for comparing the output signal with a first reference level and producing a first comparison signal, drive means for driving the photo-taking lens, means responsive to the first comparison signal to stop the drive means from driving the photo-taking lens, second comparison means for comparing the output signal with a second reference level different from the first reference level and producing a second comparison signal, and control means for controlling the variation in the output signal conforming to the scanning in response to the second comparison signal.

REFERENCES:
patent: 3906389 (1975-09-01), Matsumoto et al.
patent: 4032934 (1977-06-01), Hendrickson et al.
patent: 4618235 (1986-10-01), Ishida et al.
patent: 4673274 (1987-06-01), Nagaoka et al.

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