Optical positioning device having shaped illumination
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United States of America Patent
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Oct 23, 2007
Grant Date -
Nov 24, 2005
app pub date -
May 16, 2005
filing date -
May 21, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
One embodiment relates to an optical displacement sensor for sensing relative movement between a data input device and a surface by determining displacement of optical features in a succession of frames. The sensor includes an illuminator and a detector. The illuminator has a light source and illumination optics to illuminate a portion of the surface with a planar phase-front. The detector has a plurality of photosensitive elements and imaging optics. The illuminator and the detector are configured such that the illuminated portion of the surface is less than fifty percent larger than a field of view of the photosensitive elements of the detector. Other embodiments are also described.
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