| 摘要 |
An optical pointing device, which is to be disposed on a working surface, includes a casing, a light source, a light sensor, and an obstructing member. The casing has a light transmissible portion. The light source is mounted in the casing, and emits light that is directed through the light transmissible portion of the casing and that is reflected by the working surface back into the casing through the light transmissible portion. The light sensor is mounted in the casing, and detects the light reflected by the working surface. The obstructing member is disposed in the casing, and is capable of preventing the light sensor from detecting the light reflected by the working surface when the casing is moved beyond a predetermined distance above the working surface.
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