Light wedge for illuminating a platen in a print scanner
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United States of America Patent
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Sep 8, 2009
Grant Date -
Mar 17, 2005
app pub date -
Oct 27, 2004
filing date -
Jan 17, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
Light wedges that reflect light internally and produce diffuse light for uniformly illuminating a platen in a print scanner are presented. In one example, a light wedge has a first surface that receives light emitted from an illumination source and a second surface that limits specular reflections. The light wedge transmits light from the illumination source toward the platen, whereby uniform illumination is provided to the platen. In another example, a light wedge has an illumination surface that receives light emitted from the illumination source, a first surface that limits specular reflections, and a second surface that acts as a diffuser. The second surface reflects light out of the light wedge toward the platen, whereby uniform illumination is provided to the platen.
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