| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate the need to be provided a detecting mechanism on a plasma display surface, to enable such a use that a position can be detected while an input pen is floated over an input surface, and to obtain excellent operability by diverging directional light linearly in the vertical direction and making it beltlike through a rotary scan. SOLUTION: The light from a light source 1b is diverged linearly in the vertical direction by a piano-convex cylindrical lens 1d provided in front of a rotary mechanism 1a. Further, a reflector surface on the flank of the rotary mechanism 1a installed at a predetermined position is irradiated to make a rotary scan in a beltlike shape vertically so that an input surface 4 is entirely covered. At this time, a beltlike light beam is inputted to a photodetecting element for reference position setting and converted into an electric signal, which is inputted to a CPU. Further, the light which is rotated and scanned is converted by the input pen 3 into the electric signal, which is inputted to a control board. Therefore, the position of the input pen 3 when the light is photodetected and its input value reaches a certain level can be calculated from the angle of the rotary mechanism la and the elapsed time from the reference position.</p> |
