Patent ID: 7333083

Claim:
An optical system within a computer mouse for illuminating a target surface, the optical system comprising: a light source, positioned at a first angle relative to a circuit board, the light source configured for emitting light to illuminate the target surface, the first angle being non-perpendicular to the circuit board; and a lens having an entrance surface and an exit surface, the entrance surface positioned to gather the light from the light source and the exit surface directing the light onto the target surface, the entrance surface structured with a curvature to refractively shape the gathered light and angled at a second angle different than the first angle to refract the gathered light towards the exit surface, the exit surface structured with a curvature to further refractively shape the gathered light and angled at a third angle different from the second angle to refract the gathered light to illuminate the target surface, the lens further configured to traverse light between the entrance surface and exit surface without total internal reflection, wherein an optical axis of the entrance surface is not parallel to an optical axis of the exit surface.