Systems and methods for illuminating a platen in a print scanner
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United States of America Patent
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Sep 18, 2007
Grant Date -
Aug 3, 2006
app pub date -
Oct 7, 2005
filing date -
Jan 17, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Systems and methods for illuminating a platen are provided. A hybrid illumination system uses both diffusion and collimation to efficiently provide a flat, uniform illumination at a platen. One or more diffusers are disposed between the illumination source array and a collimating lens. An illumination system is provided which uses diffused light to illuminate a platen in a print scanner. The illumination system has an illumination source array and a light wedge. The light wedge reflects light internally which makes the illumination even more diffuse. Sources are divided into at least a center region and a perimeter region. The density of sources provided in the perimeter region is greater than in the center region to correct for natural light falloff in the illumination system. Intensity control can be performed individually or in groups.
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