| 摘要 |
<p>An object is to provide a position detecting device that is able to accurately detect an indicated position via an indicating unit or device even when a water droplet or the like is formed upon the position-detecting-device's surface.
The position detecting device comprises: a light-guide plate (1) for placement upon a displaying surface of a displaying device, and made of a translucent material; an emitting unit (2) for emitting, from the sides of the light-guide plate (1), arranged in line along the X-axis and the Y-axis, a plurality of light beams each of a predetermined width, so as to be totally reflected thickness-wise within the light-guide plate (1) and to travel heading in predetermined directions parallel to the plane of the light-guide plate (1); an emission-control unit (3) for controlling the emitting unit (2) so as to make the light beams each scan the light-guide plate (1) in progression along the sides thereof, in an X-axis direction and in a Y-axis direction; at least one indicating device (4) having a light-guiding part (41) for guiding, by contacting the light-guide plate (1), thereinto light traveling within the light-guide plate (1), and a detection unit (42) for outputting, by detecting the light guided via the light-guiding part (41), a detection signal; and a coordinate calculating unit (43) for calculating, based on a scanned position derived from the detection signal and the emission-control unit (3), a coordinate position where the at least one indicating device (4) contacts the light-guide plate (1).
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