Patent ID: 8049726
Filing Date: 2011-11-01
Classification: G06F

Abstract:
1. An optical trace detecting module, disposed in a computer input device, a light-pervious plate being disposed on an upper surface of the computer input device and used for an object to contact with and move on a surface thereof, a lower surface of the computer input device displacing on a plane relatively, the optical trace detecting module comprising: a circuit board, having an optical sensor electrically disposed thereon, for receiving an image reflected from the object and the plane; a first projection set, for emitting a first sensing beam to the object and making the object reflect a first reflecting beam; a first optical path diverting element, disposed between the first projection set and the optical sensor; a second projection set, for emitting a second sensing beam to the plane and making the plane reflect a second reflecting beam; a second optical path diverting element, disposed between the second projection set and the optical sensor; and a third imaging lens, disposed between the first optical path diverting element and the second optical path diverting element and the optical sensor; wherein the first reflecting beam is directed by the first optical path diverting element to pass through the third imaging lens and is refracted to the optical sensor, and the optical sensor senses the displacement of the object and generates a corresponding first control signal; wherein the second reflecting beam is directed by the second optical path diverting element to pass through the third imaging lens and is refracted to the optical sensor, and the optical sensor senses the plane and generates a corresponding second control signal.