Optical motion sensing device with ambient light sensing
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United States of America Patent
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Mar 15, 2011
Grant Date -
May 14, 2009
app pub date -
Jul 12, 2006
filing date -
Jul 12, 2006
priority date (Note) -
Expired
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Abstract
An optical motion tracking device (10) includes a photo detector array (18) comprised of highly sensitive photo sensors coupled to a computational circuit (19) inside a casing (11). The photo detector array (18) detects optical features of a surface (25) using ambient light reflected from or propagated through the surface (25) and transmitted into the casing through an aperture (15). Protrusions (14) on the bottom (10) lifts the device (10) from the surface (25) and allow the ambient light to illuminate the surface (25). A nontransparent sidewall (17) encloses a light path from the aperture (15) to the photo detector array (18) to reduce light interference. A reflective band (32) near the aperture (15) to increases the illumination of the surface (25). The computational circuit (19) calculates the correlation between the images from the photo detector array (18) to track the motion of the device (10).
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