| 摘要 |
In a small-size mobile terminal, an optical sensor for reading an optical image of a finger that is kept in contact therewith is installed below an LCD for displaying information. The optical sensor is provided with a light source for emitting a predetermined light beam toward a sensor window, a lens for converging light reflected by the finger that is in contact with the sensor window and an image sensor for detecting the converged light. A CPU shifts a pointer based upon the movement of the finger detected by the optical sensor. Thus, it is possible to obtain a pointing device that is superior in the operability, miniaturizes the device, and is resistive to dusts.
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