Photosensor for optical observing or photographing devices

Details Photosensor for optical observing or photographing devices Photosensor for optical observing or photographing devices

1983-03-14

1985-12-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354404, 354403, G01J 120

Patent

active

045567875

ABSTRACT:
The photosensor is provided with a light-receiving surface for receiving a reflected image of an object and in which an aperture is provided. The aperture is positioned so as to receive a focused image and means are provided to prevent light from leaking directly to the light-receiving surface from the aperture. Prevention of light leakage permits focusing to be detected at high precision.

REFERENCES:
patent: 3969575 (1976-07-01), Gerritsen
patent: 4152586 (1979-05-01), Elliott
patent: 4357104 (1982-11-01), Davinson

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