Document size sensing having a spectroscope
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United States of America Patent
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Jun 14, 1994
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N/A
app pub date -
Nov 13, 1992
filing date -
Nov 14, 1991
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Abstract
A document size sensing device incorporated in an image recorder and capable of sensing a plurality of document sizes with a small number of optical elements. A sensor is made up of a single light emitting element, a spectroscope for dividing light issuing from the light emitting element into a plurality of beams toward a plane where a document is laid, a lens on which light reflected by the document is incident, and a plurality of light-sensitive elements for receiving the light propagating through the lens. A single sensor with such a configuration can sense a plurality of document sizes.
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