Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1989-04-17
1990-03-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
35821313, 358482, 357 32, H01J 4014
Patent
active
049104128
ABSTRACT:
A high density planar array of substrate-supported, thin film diodes constituting photoresponsive semiconductor elements is placed between a document to be read and a light source for illuminating the document. The document is illuminated by the light source via windows in the array, reflected light from the document impinging on the photoresponsive elements constituted by the diodes which are electronically interrogated to provide a signal which is indicative of image information on the document. The light source directly illuminates small portions of each diode to establish a discharge or bias current that makes the array more sensitive and responsive. The high density diodes of the array can be formed in a manner that minimizes leakage current between adjacent diodes.
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Beck George
Curatolo Joseph G.
Evans Larry W.
Moxon II George W.
Nelms David C.
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