Chirped grating finger navigation
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United States of America Patent
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Feb 15, 2011
Grant Date -
Apr 5, 2007
app pub date -
Oct 3, 2005
filing date -
Oct 3, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
One embodiment of the invention is a user input system for a hand held computing device that comprises a movable piece with a reflective side, an optical cavity adjacent to said movable piece, a light emitting source positioned within the cavity such that emitted light is incident on to the reflective side of the movable piece, and a sensor positioned within the cavity to receive light reflected from the reflective side.
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