Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-03-11
1988-08-09
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250211R, 357 2, 357 30, H01L 3100, H01L 2714
Patent
active
047630108
ABSTRACT:
There is a photosensor comprising: a photoconductive layer containing amorphous silicon provided on a substrate in which this photoconductive layer consists of laminated films of two or more layers having different refractive indexes and the refractive index of the lowest layer of the laminated films is not larger than 3.2 for the incident light of a wavelength of 6328 .ANG.; a pair of electrodes provided in electrical contact with the photoconductive layer; and a photo sensing section. A long size image sensor unit is constituted by a plurality of such photosensors arranged like an array, a matrix drive circuit to matrix-drive each photosensor, and a light source such as light emitting diodes of a fluorescent lamp to illuminate an original to be read. With this image sensor unit, it is possible to provide a low-cost image reading apparatus which can read an image on the original at a high speed in which: the uniformity of the characteristic of each photosensor is improved; a variation in signal between the bits is reduced; a correction circuit for such a variation is unnecessary; and the peel-off of the photoconductive layer does not occur. A method of manufacturing such photosensors is also disclosed.
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Fukaya Masaki
Kamio Masaru
Komatsu Toshiyuki
Sekimura Nobuyuki
Shoji Tatsumi
Canon Kabushiki Kaisha
Westin Edward P.
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