| 摘要 |
<p>PURPOSE:To secure required coordinate calculation accuracy and to more reduce an invalid reading area by canceling an induced signal component caused by direct electromagnetic coupling between an exciting line and a detecting line. CONSTITUTION:Concerning the coordinate reader composed of a coordinate indicator 5 and a main body 1 of a coordinate detector provided with an exciting line 101, detecting line 111, exciting circuit 2, signal processing circuit 3 equipped with a function for detecting the position information of the coordinate indicator 5 from an induced signal induced at the detecting line and control circuit 4, the detecting line 111 are provided with two loops of a first loop 111a and a second loop 111b, and those loops are serially connected so that their directions can be opposite each other.</p> |
