公开(公告)号：US07473885B2

公开(公告)日：2009-01-06

申请号：US11285695

申请日：2005-11-21

Applicant: Yeong Chuan Lim

Inventor： Yeong Chuan Lim

IPC: G06M7/00 ,  G01J1/32 ,  G06F3/033

CPC classification number: G01J1/32 ,  G01J1/4228 ,  G01J1/44 ,  G01J2001/0285 ,  G06F3/0317

Abstract: Advantage is taken of the fact that in optical navigation devices it is possible to measure the intensity of light impacting the pixel array of photo-diodes. Based upon such an intensity determination, a feedback signal is used to reduce the intensity of the light to a point where it is equal to or less than a predetermined value. In one embodiment, the discharge rate of a capacitive power supply is used to determine the intensity of the light source impacting the pixels. When the discharge rate is faster than a given amount the inference is that the light intensity is too great and power is reduced to the light source to reduce the intensity.

Abstract translation: 优点在于，在光学导航装置中，可以测量影响光电二极管的像素阵列的光的强度。 基于这样的强度确定，使用反馈信号将光的强度降低到等于或小于预定值的点。 在一个实施例中，电容性电源的放电速率用于确定影响像素的光源的强度。 当放电速率比给定量更快时，推断光强度太大并且功率降低到光源以降低强度。