| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a multi-display system capable of correcting a deviation in optical axis caused by temperature or another disturbance and achieving stable performance by actively adjusting the optical axis of a laser beam emitted from a detector unit using a laser diode, a retroreflection film and a PSD for position detection. SOLUTION: The multi-display system has a shaft 10 for rotating position detector units 2 and 3 upward/downward to be driven and controlled by a motor 12. The shaft 10 is located coaxially with the axis including the emitting point of the laser beam L from the laser diode 5. The emitting direction of the laser beam L is adjusted by actively moving the position detector units 2 and 3.</p> |
