Contact type image sensor having photoelectric conversion elements to reduce signal variation caused by luminous intensity variation of light source
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United States of America Patent
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Nov 10, 1992
Issued Date -
N/A
app pub date -
Jul 30, 1990
filing date -
Mar 14, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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