Patent ID: 7884798

Claim:
A laser input device, comprising: a transmitting/detecting circuit; a laser light; a control unit; a switching circuit coupled between a power source and the laser light; a light sensor coupled between the laser light and the control unit; wherein the laser light projects a laser beam to a working surface to be reflected therefrom, and the light sensor generates a cursor-moving signal to the control unit when the light sensor detects the reflected laser beam; wherein the transmitting/detecting circuit projects an infrared ray to the working surface to be reflected therefrom, and detects the reflected infrared ray, the transmitting/detecting circuit generating an enabling signal if the transmitting/detecting circuit fails to detect the reflected infrared ray; and wherein the transmitting/detecting circuit provides the enabling signal to the control unit, and the control unit outputs a switching signal such that the switching circuit shuts off the power provided to the laser light, thereby terminating the emission of the laser beam from the laser light.