Clocked optical sensing apparatus
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United States of America Patent
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May 30, 1989
Grant Date -
N/A
app pub date -
Dec 30, 1986
filing date -
Dec 30, 1986
priority date (Note) -
Expired
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Abstract
A document sensor comprises a source of infrared light directed toward a document and a photocell for reacting to the light as it is reflected from the document. A clock drives the light source to send cyclically recurring light pulses toward the document. The clock source also enables a detector each time that the document light source is switched on. After a predetermined number of successive reflected light pulses have been picked up, a document present signal is given.
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