| 摘要 |
An optical position input device is provided which enables simultaneously inputting of multiple points. The position input device (10) includes: a light guide plate (5) having a surface with an active input area (1) formed thereon, for allowing one to touch the surface for identification of an input position to obtain scattered light from a ray of light traveling under the input position; a plurality of light emitting elements (2) for emitting a ray of light into the light guide plate (5) and scanning the active input area (1) in one coordinate direction with the emitted ray of light; a light receiving element (3) disposed along the other coordinate direction of the active input area, for receiving the scattered light guided by the light guide plate (5); and input position detection means (4) for detecting an input position within the active input area (1) based on a coordinate position in the one coordinate direction identified by scanning with the plurality of light emitting elements (2) and a coordinate position identified in the other coordinate direction when the plurality of light emitting elements (2) are turned on or off for scanning, and the coordinate position in the other coordinate direction can be identified by the light receiving element (3) receiving the light. |
