| 摘要 |
PROBLEM TO BE SOLVED: To identify the rotational positions of rotating mirrors each scanning by reflecting a laser beam, while rotating. SOLUTION: The rotating mirrors 2 are provided in two positions on one side of a touch panel, Reflection surfaces 1 to 4 of each mirror reflect a laser beam from a light source and reflect a return beam, reflected by a retroreflector on the other side of the touch panel, The return beam is detected by a reflection beam detecting part, The coordinates of a touch are determined from an angle, at which two return beams is broken. Magnetic bodies 31 to 34 of different widths are mounted on the upper surface of each mirror at equal angular distances, their magnetism is detected by an identifier detecting part 25, and the reflection surfaces are identified based on signals therefrom, A pulse- generating part 26 generates pulses, based on the signals from the detecting part 25, the phase of the pulses is adjusted by a phase adjustment part 27, The pulses are used as reference signals for starting the respective reflection surfaces scanning and also as references for detecting the coordinates. |
