| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the noise interference of an electrostatic digitizing panel, by amplifying the signal when a an object is close to the digitizing panel with an amplifier, detecting a noise impulse connected to a resistance layer, and disconnecting the input of the amplifier from the resistance layer according to the detection. SOLUTION: Currents flowing to corner wires 20a-20d are caused substantially by the object which is close to the digitizing panel. When a noise detector 40 detects a noise phenomenon on the corner wire 20d, a trigger signal is sent to a blanking pulse generator 42 through a line 62. A control signal generated on the line 64 changes a switch from an opening state to a closing state, and consequently the input of the amplifier 36d is disconnected from the output of an I/V converter 34d and the input of a signal converter 38d is disconnected from the output of the amplifier 36d.</p> |
