| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a coordinate input device capable of detecting the accurate position of diffused light emitted from a light emitting means. SOLUTION: The light emitted from an indication device 4 is focused with a condenser lens 61, and the amount of light thereof is detected with a high- sensitivity frequency detection means 71 so that the control signal thereof detected with a control signal detection means 72. The diffused light from the indicating device passes through a visible height cut filter 100 to exclude disturbance light, and is received with linear sensors 20X, 20Y which detect a coming direction of light. The sensors are controlled with a sensor control means 31, and the outputted signal is converted with an AD conversion means 31A included in the sensor control means 31 into the digital signal, which is sent to a coordinate calculation means 32 and the output coordinate values on the sensor are calculated.</p> |
