| 摘要 |
The position detection device disclosed has a light source unit provided at a tip portion of a position pointing device, and an optical unit for detecting an incident direction of light from a position pointing device. The optical unit has an optical lens, a group of light detection elements, a group of first signal holding elements, a group of second signal holding elements, a group of connection switching elements, a differential output element, and a signal selecting element. The light source unit has a light source element, and a synchronizing element. The position detection device according to the present invention can eliminate extraneous light by high speed modulation, and provide a low cost optical digitizer which is resistant to disturbance noise.
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