| 摘要 |
A coordinate input unit is composed of a sensor as a means for detecting a manipulating state on a manipulation surface A manipulated by a coordinate indicator and a front light as an illumination means disposed on the sensor to illuminate the manipulation surface A. When the manipulation surface of the coordinate input device is illuminated, the light emitted from an LED is transmitted in a light introduction plate, emerged from a prism surface, changes its direction by being reflected on a reflection plate, and is directed to the manipulation surface. With this operation, the manipulation surface is illuminated.
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