Patent ID: 8531437

Claim:
A handwriting input system, comprising: a handwriting input device comprising a penholder, a writing head adjacent to one end of the penholder and an infrared light source fixed to the penholder adjacent to the writing head, the writing head capable of leaving color distinguishable traces on an object; a visible light sensing member configured for capturing images of the color distinguishable traces; an infrared light sensing member configured for capturing images of movement track of the infrared light source; and a receiving member, the visible light sensing member and the infrared light sensing member slidably installed on the receiving member; wherein the receiving member comprises two parallel sliding slots facing toward each other, the IR light sensing member comprises two first flange portions at opposite sides thereof, the two first flange portions slidably accommodated in the two parallel sliding slots, respectively, the IR light sensing member exposed to an exterior and facing toward a writing board.