| 摘要 |
<p>PURPOSE:To accurately detect a position even when another radio wave is mixed from the outside by separately possessing a loop coil to transmit a radio wave and a loop coil to receives the radio wave, and driving the transmitting loop coil by means of a circuit which can supply a huge current. CONSTITUTION:A position detecting part 1 consists of transmitting loop coil 11-1 to 11-48 which have mutually parallel conductors, and many, for example, 48 receiving loop coils 12-1 to 12-48, which have the mutually parallel conductors in the same way. A selection driving part 2 successively selects one of the transmitting loop coils 11-1 to 11-48, supplys the current to the coil, drives the coil, the part 2 consists of current drivers 21-1 to 21-48 as many as the number of the loop coils, and a multiplexer 22, and it is driven by the circuit which can supply the huge current. Thus even when inductive noise is generated due to the other radio wave, position detecting accuracy is not decreased or a malfunction is not induced.</p> |
