Optical motion sensing device with ambient light sensing

Details Optical motion sensing device with ambient light sensing Optical motion sensing device with ambient light sensing

2011-03-15

2011-03-15

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C345S166000

Reexamination Certificate

active

07906757

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).

REFERENCES:
patent: 4647771 (1987-03-01), Kato
patent: 6765555 (2004-07-01), Wu
patent: 2007/0164999 (2007-07-01), Gruhlke

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