| 摘要 |
<p>PURPOSE:To output a coordinate position with a high precision, by using one resistance film and one conductor film and applying the voltage of a DC power source to the resistance film in time division in longitudinal and lateral directions and detecting the potential at a pressurized point in longitudinal and lateral directions independently of each other by a writing tool. CONSTITUTION:A resistance film 19 is formed on an insulating substrate 20, and an insulating film 16 provided with a conductor film 17 on the rear face is arranged on the surface of the film 19 through a pressure sensitive rubber 18. Terminal groups 21-24 are provided in the peripheral part of the surface of the resistance film 19, and terminal groups 21-24 are connected to respective terminals of analog switch groups 25-28 in a ratio of 1:1. Analog switches 30 and 31 are connected to a DC power source 29, and switches 30 and 31 are connected to switches 26 and 27, and switches 25 and 28 are connected to the negative pole of the power source 29 and are grounded. A current is flowed to the resistance film 19 from the power source in time division in longitudinal and lateral directions through switches 25 and 28, switches 30 and 31, and switches 26 and 27, and thus, coordinates of a pressurized point 34 of a writing tool 33 are detected with a high precision.</p> |
