Patent ID: 7423227
Filing Date: 2008-09-09
Classification: G06F

Abstract:
1. An apparatus for optical navigation comprising: a surface comprising an aperture, said surface configured to be moveable against an illuminated surface having a detectable texture; an optical motion detection circuit integral to said apparatus and optically coupled to said detectable texture of said illuminated surface, said optical motion detection circuit comprising a single detector for acquiring images of said illuminated surface at a specified rate, said detector acquiring a single image at a time, and comprising an image processor producing motion signals indicative of motion of said surface relative to said detectable texture of said illuminated surface, wherein said motion signals are produced by comparing two said images and comprise a change in location in a first axis and a change in location in a second axis, wherein said optical motion detection circuit is operable to detect said detectable texture without requiring an integral illumination source; an internal interference reduction light source integral to said apparatus and proximate said aperture, said interference reduction light source operable to provide interference reducing illumination onto said illuminated surface in response to said optical motion detection circuit detecting interference caused by an illumination from said illuminated surface; and an optical filter operable to filter said illumination and receive said interference reducing illumination such that said optical motion detection circuit can detect said detectable texture in the event of interference caused by said illumination.