Optical pointing device with variable focus
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United States of America Patent
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Mar 4, 2008
Grant Date -
Dec 1, 2005
app pub date -
May 25, 2004
filing date -
May 25, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for focusing an image of a work surface on an optical sensor array in an optical pointing device. Light from a region of the work surface is captured by an imaging system incorporating an optical coupling system and the optical sensor array. The focus of the imaging system is adjusted in accordance with the distance between the optical pointing device and the work surface. The distance may be sensed, or inferred by adjusting the imaging system to maximize the focus of the image.
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