Speckle sizing and sensor dimensions in optical positioning device
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United States of America Patent
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May 9, 2006
Grant Date -
Nov 24, 2005
app pub date -
May 13, 2005
filing date -
May 21, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
One embodiment relates to an optical displacement sensor for sensing transverse displacement of a data input device relative to a surface by determining displacement of optical features in a succession of frames. The sensor includes at least a coherent light source, illumination optics to illuminate a portion of the surface, imaging optics, and a first array of photosensitive elements having a periodic distance. The illuminator and the detector are configured to produce on the first array of photosensitive elements an intensity pattern of light reflected from the illuminated portion of the surface. The intensity pattern comprises a plurality of speckles having an average speckle diameter which is between one half and two times the periodic distance of the array.
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