| 摘要 |
<p>PURPOSE: A bidirectional touch screen system for an electrical lecture is provided to reduce manufacturing costs by reducing conspicuously the number of an infrared emitting diode which are necessary. CONSTITUTION: One light guide plate(60) and one infrared emitting diode(50) are installed in each side of an infrared ray radiating support. The infrared emitting diode is settled in the infrared ray radiating support. The light guide plate is side by side installed in a longitudinal direction in the infrared ray radiating support. If the infrared emitting diode emits the infrared ray in the longitudinal direction in the light guide plate, the light guide plate diffuses the infrared ray in the infrared ray camera direction.</p> |
