Patent ID: 7166831

Claim:
An optical mouse, the mouse comprising: a housing having a bottom surface and an optical window defined by an opening in the bottom surface of the housing; a optics module disposed within the housing and configured to direct light out of, and receive light in, the housing through the optical window, the optics module including a light source, a sensor, and an imaging lens disposed between the sensor and the optical window; and a replaceable, transparent contaminant baffler removably secured relative to the bottom surface of the housing, the barrier comprising a semi-rigid member including a securing portion configured for releasably engaging an edge of the opening of the bottom surface of the housing to directly fasten the barrier relative to the bottom surface of the housing and to position the barrier to extend across and cover the optical window, wherein the contaminant baffler is spaced from and independent of the imaging lens of the optics module.