Optical pointing device
AssigneePixart Imaging Inc.
InventorJeng-Fang Lan
Life of this patent
Estimating the term…
Abstract
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.
Claims6
An optical pointing device adapted to be disposed on a working surface, comprising:
- a casing having a side, and a light transmissible portion that is provided on said side of said casing and that faces the working surface;
- a light source mounted in said casing, and adapted to emit light that is directed through said light transmissible portion of said casing and that is subsequently reflected by the working surface back into said casing through said light transmissible portion;
- a light sensor mounted in said casing, and adapted to detect the light reflected by the working surface;
- a processing unit coupled to said light sensor, and operable so as to determine displacement of said casing relative to the working surface based on the reflected light detected by said light sensor when said casing is moved along the working surface;
- and
- an obstructing member disposed in said casing, and capable of preventing said light sensor from detecting the light reflected by the working surface when said casing is moved beyond a predetermined distance away from the working surface.
Dependencies are inferred from the claim text.