Contact type image sensor having photoelectric conversion elemen

Details Contact type image sensor having photoelectric conversion elemen Contact type image sensor having photoelectric conversion elemen

1990-07-30

1992-11-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214B, 358482, H01J 4014

Patent

active

051626446

ABSTRACT:
A contact type image sensor comprises a transparent substrate, photoelectric conversion elements disposed on the substrate, and an opaque film disposed selectively over the first photoelectric conversion elements. The first photoelectric conversion element over which the opaque film is disposed indicates a reference quantity of received light. The second photoelectric conversion element connected with the first photoelectric conversion element in adjacent relationship and having no opaque film disposed thereover indicates a quantity of light from an original document. A signal free from a varying luminance of the light source is obtained from the junction point of the first and second photoelectric conversion elements.

REFERENCES:
patent: 4874957 (1989-10-01), Sasaki et al.
patent: 4894700 (1990-01-01), Nobue et al.
patent: 4908718 (1990-03-01), Shimada
patent: 4931661 (1990-06-01), Fukaya et al.
patent: 4940888 (1990-07-01), Nagata et al.
patent: 4972243 (1990-11-01), Sugawa et al.
patent: 4982079 (1991-01-01), Yagyu
patent: 5015837 (1991-05-01), Hiroi et al.
Nikkei Electronics vol. 207, No. 434, Nov. 16, 1987, pp. 207-221.

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