Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1974-12-11
1976-08-17
La Roche, Eugene
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250201, 250204, 250237R, 354 25, G01J 144, H01J 3904
Patent
active
039756319
ABSTRACT:
Structures to be used during focalizing of an optical system which has a focal plane. A composite photoconductive assembly is situated at the region of the latter focal plane and includes a pair of photoconductive portions, a substrate common to and carrying these photoconductive portions, a light-diffuser situated in front of one of these photoconductive portions for diffusing light which reaches the same, and a light-transmitter situated in front of the other of the photoconductive portions for transmitting non-diffused light thereto. In this way these photoconductive portions generate separate photoelectric outputs in response to diffused and non-diffused light respectively impinging on the above photoconductive portions. An electrical structure is electrically connected with these photoconductive portions for comparing the outputs thereof so as to detect from a comparison of these outputs the focal adjustment of the optical system.
REFERENCES:
patent: 3274914 (1966-09-01), Biedermann et al.
patent: 3562785 (1971-02-01), Craig
patent: 3830571 (1974-08-01), Imai et al.
patent: 3875401 (1975-04-01), Stauffer
Asahi Kogaku Kogyo Kabushiki Kaisha
La Roche Eugene
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