| 摘要 |
A position-detecting system, which is used to detect a relative position of a movable member with respect to a fixed member, is provided. The system includes a plurality of light sources, a position-sensing device, and a light-source controller. The light sources are provided on one of the fixed member or the movable member, and emit a spotlights. The position-sensing device is provided on another one of the fixed member or the movable member. The position-sensing device receives the spotlight and outputs a position signal relating to the relative position in accordance with a position where the spotlight is received. The light-source controller controls an ON/OFF state of the plurality of light sources. The light-source controller continuously turns on one of the light sources when only a spotlight from light source is detected by the position-sensing device, and flashes two or more than two of the light sources when spotlights from two or more than two light sources are detected by the position sensing device.
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