Patent ID: 8901826
Filing Date: 2014-12-02
Classification: G01J,G06F

Abstract:
1. A calibration method for a driving current of a light source, the calibration method being adapted to sequentially calibrate at least an optical navigation device, each optical navigation device comprising a light sensing device, a memory unit and a driving unit, the driving unit being electrically connected to the memory unit and a light source, the light sensing device being configured to receive a reflection light, the calibration method being used for pre-calibrating the driving current of the light source of each optical navigation device before the optical navigation device is being used, the calibration method comprising steps of: driving the light source to provide a beam through configuring the driving unit to supply a first driving current to the light source; configuring the light sensing device to generate a sensed light value, wherein the sensed light value is related to the reflection light, and the reflection light is derived from the beam after being reflected by a standard test surface of a test device; obtaining a second driving current through modulating the value of the first driving current according to the sensed light value; and recording the value of the second driving current in the memory unit and driving the light source to provide the beam according to the second driving current.