| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an inexpensive coordinate detecting device with a reliability, where a mobile part is not provided in light emitting parts and a light receiving part, by providing a light emitting element, a light emission driving means and a control filter for controlling an irradiation area in at least two light emitting parts which are arranged in the periphery of a detecting screen. SOLUTION: The light emitting parts 1 are composed of the light emitting elements such as LED, etc., the light emission driving means 3 for driving the light emitting element 2 and the control filer 4 for controlling the irradiation are irradiated with light from the light emitting parts 1. The light emitting element 2 is arranged in a three-layer structure in a longitudinal direction and divided into, for example, eight areas, that is, the areas without the irradiation of light and the ones with light irradiation. Then, light irradiated from the two light emitting parts 1 which are arranged in the upper end of the detecting screen is detected by the light receiving element in a pen-type indicating coordinate detecting means which is held in hand by a user so that the position of the optionally indicated area on the detecting screen is discriminated.</p> |
