Patent ID: 8552384

Claim:
A mirror reflection processing method for a position sensitive detector device, wherein the position sensitive detector device comprises an infrared emitter for emitting infrared rays and an infrared receiver for receiving reflected infrared rays, wherein the infrared emitter has four infrared emitting intensity modes sequentially switchable which are first, second, third and fourth infrared emitting intensity modes in a descending order of intensity, and the mirror reflection processing method is provided with a mirror interference determination procedure, comprising: calculating a designated voltage value according to infrared signals received by the infrared receiver so as to indicate an infrared signal intensity of the infrared rays received by the infrared receiver, wherein the voltage value in the fourth infrared emitting intensity mode is calculated; and setting a first fixed value and comparing the voltage value calculated in the fourth infrared emitting intensity mode with the first fixed value, and determining that the reflected infrared rays are caused by a mirror interference when the voltage value is greater than the first fixed value; wherein in the mirror interference determination procedure, there are two voltage values which are calculated from the infrared signals received by the infrared receiver and one of the two voltage values is said designated voltage value; calculating, in the fourth infrared emitting intensity mode with the lowest intensity, the two voltage values according to the infrared signals received; and setting a second fixed value and a first set range so as to determine that the reflected infrared rays are caused by the mirror interference when the difference between the two voltage values is below the second fixed value and the designated voltage value falls within the first set range, wherein the mirror interference processing procedure further comprises considering that no signal was collected by the position sensitive detector device in response to the determination of the mirror interference.