Exposure control for a CCD scanner
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United States of America Patent
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Jun 20, 2006
Grant Date -
N/A
app pub date -
Oct 7, 1999
filing date -
Oct 7, 1999
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A scanner is disclosed that operates to maintain the image sensor in the scanner at a proper exposure level during the scanning of a page despite variations in the scan rate. The scanner includes an illumination system operable to produce light in response to receiving power and to project the light, as a scanning light, onto the page being scanned. In addition, the scanner includes apparatus for moving the scanning light relative to the page at a scan rate, an image sensor for measuring the light reflected from the page and an exposure control device for controlling the exposure of the image sensor. The exposure control device operates to control the exposure of the image sensor by regulating the power in relationship to the scan rate.
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