Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1977-09-16
1979-05-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250204, 250211R, 354 25, G01J 120
Patent
active
041550048
ABSTRACT:
In the arrangement disclosed, a photoconductive cell has electrical characteristics which depend upon its optical exposure. An optical system focuses an image upon the cell. An electrical system utilizes the output of the cell on the basis of the light upon the cell. The cell includes a multiplicity of photoconductive portions forming at least one row transverse to the direction of image intensity changes so that different portion sense different intensities. The electrical means are connected to a plurality of the portions. The portions may be formed into an elongated integral strip whose direction changes and whose edges are insulated from each other. Alternately the portions may be connected electrically to form a continuous electrical strip. The strip may have a spiral shape. In one embodiment the portions are connected together to form an AND or OR gate. Two identical cells may straddle a desired image plane and be subject to the same image. Suitable means respond to the differences between the cells to drive a motor which adjusts an image-forming objective.
REFERENCES:
patent: 3838275 (1975-09-01), Stauffer
patent: 3857031 (1974-12-01), Sinclair et al.
patent: 3885151 (1975-05-01), Tokushima
patent: 4019049 (1977-04-01), Schulz
patent: 4049960 (1977-09-01), Schulz
Canon Kabushiki Kaisha
Nelms David C.
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