1981-06-25
1986-06-17
Adams, Russell E.
354474, 3542891, G03B 708
Patent
active
045952728
ABSTRACT:
An indicator for use in an auto focus type camera, which produces an output signal of magnitude indicative of the amount the camera lens must move, and of a sign or characteristic indicative of the direction the camera lens must move in order to reach a desired focus position; the indicator comprising a plurality of light-emitting diodes a first group of which can only respond to a signal having the first characteristic and a second group of which can only respond to a signal having the second characteristic, but each of the detectors in both groups being responsive to signals of different magnitudes, so that upon the lighting of one of the light-emitting diodes, it can be determined how far the lens must move, and in what direction to achieve the desired proper focus position.
REFERENCES:
patent: 4034392 (1977-07-01), Ishizaka et al.
patent: 4192590 (1980-03-01), Kitaura
patent: 4240727 (1980-12-01), Lermann et al.
patent: 4300826 (1981-11-01), Aoki et al.
patent: 4322141 (1982-03-01), Tominaga et al.
U.S. application Ser. No. 168,225, filed Jul. 10, 1980, in the name of Richard Langlais, et al for Method and Apparatus for Determining Focus Direction and Amount.
Adams Russell E.
Honeywell Inc.
Ungemach Charles J.
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