Optical detector for an auto-focus camera

Details Optical detector for an auto-focus camera Optical detector for an auto-focus camera

1988-01-28

1989-05-02

Adams, Russell E.

354403, 354482, G03B 300

Patent

active

048273007

ABSTRACT:
In an auto-focus system for a camera, a beam of infra-red light from the camera is reflected by the subject and detected by a detector 5, the balance or strength of illumination across the detector 5 indicating the distance of the subject relative to the lens 2. A light source is provided to illuminate directly the detector to bias it into a preferred operating range of illumination.

REFERENCES:
patent: 3528350 (1970-09-01), Schmitt
patent: 3860936 (1975-01-01), Harvey
patent: 4001845 (1977-01-01), Maitani et al.
patent: 4143954 (1979-03-01), Numata et al.
patent: 4146319 (1979-03-01), Numata et al.
patent: 4156564 (1979-05-01), Tsunekawa et al.
patent: 4255031 (1981-03-01), Johnson et al.
patent: 4293208 (1981-10-01), Bagdis
patent: 4385817 (1983-05-01), Saito
patent: 4444477 (1984-04-01), Tamura

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