| 摘要 |
<p>PURPOSE:To realize a large-sized device by using a laser light for a light source, and calculating a coordinate value, based on an output signal of a photosensor and a result of an angle detection of a rotary mirror. CONSTITUTION:Laser beams emitted from lasers 121, 122 are made incident on rotary mirrors 125,126 through half mirrors 123, 124, respectively, reflected by a mirror part 112 of a position indicator 110, and made incident on photosensors 127, 128 through the rotary mirrors 125, 126 and the half mirrors 123, 124. In such a way, it is detected that the laser beams which are made incident on the rotary mirrors 125, 126 are made incident toward the center position of the mirror part 112, and based on rotation angle psi1, psi2 of the rotary mirrors 125, 126 and output signals of the photosensors 127, 128, a coordinate value of the center position of the mirror part 112 of the position indicator 110 is calculated.</p> |
