Patent ID: 8519958
Filing Date: 2013-08-27
Classification: G01N,G06F

Abstract:
1. An optical sensor, comprising: a sensor for sensing a reflected light; an image capture device coupling with the sensor for reading the reflected light and calculating an average light intensity of the reflected light; a controller coupling with the image capture device for outputting a control signal based on the average light intensity of the reflected light; a driver coupling with the controller for receiving the control signal to output a variable drive current based on the control signal, wherein the control signal can vary the drive current to a first drive current when a light intensity of the reflected light is not located between a first light intensity and a second light intensity, wherein the first drive current can vary a light intensity of the first light to make a light intensity of the reflected light located between a first light intensity and a second light intensity, wherein the first light intensity is larger than the second light intensity; and a light source coupling with the driver for receiving the variable drive current to generate a light being variable in intensity according to the variable drive current, wherein the reflected light read by the image capture device is only from the light source when the control signal is outputted; wherein the light is reflected by a surface to be the reflected light, and the driver generates the variable driver current to compensate a change in the reflected light to make the image capture device reads the reflected light in a single, predetermined frame rate, wherein the optical sensor efficiency does not be affected, and the single, predetermined frame rate is adjusted when the variable driver current reaches a limit that the driver can generate.