Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1979-10-17
1982-01-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354 25, G01J 136
Patent
active
043096034
ABSTRACT:
Range finding equipment for use with optical systems and particularly low cost cameras to provide for proper focus of a remote object. A small number of radiation detectors are positioned to receive radiation in first and second patterns from the object to be focused upon through an auxiliary lens. The outputs of the detectors are processed to produce a resultant signal which is indicative of the position for proper focus. The auxiliary lens is coupled to the taking lens of the camera and means are provided for moving both lenses in accordance with the resultant signal so that the taking lens is in a proper focus position. The detectors may be photo diodes to facilitate the use of log signals to thereby compensate for differences in intensity of the scene being viewed.
REFERENCES:
patent: 3875401 (1975-04-01), Stauffer
patent: 3937950 (1976-02-01), Hosoe et al.
patent: 4103152 (1978-07-01), Stauffer
Honeywell Inc.
Nelms David C.
Ungemach Charles J.
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