Patent ID: 8279178

Claim:
A system for performing optical navigation, the system comprising; a light source positioned to emit illumination light onto a target surface at a nonzero angle of incidence with respect to the normal to the target surface; an image sensor array positioned to receive the illumination light reflected from the target surface at a nonzero angle of reflection with respect to the normal to the target surface to produce frames of image data for correlation to estimate displacement with respect to the target surface; and an imaging lens positioned between the target surface and the image sensor array to receive and optically manipulate the illumination light reflected from the target surface at the nonzero angle of reflection onto the image sensor array, the imaging lens being orientated to be substantially horizontal with respect to the target surface such that the optical axis of the imaging lens is substantially perpendicular to the target surface and the optical axis of the imaging lens is offset from the center of the image sensor array.