| 摘要 |
<p>PURPOSE:To make a magnetic field or electric field, sent by a position indicator, operate on a conductor group for position coordinate determination and to determine the indication position coordinates of the position indicator by forming an oscillation system of plural oscillation elements that a tablet and the position indicator have when the position indicator is positioned optionally on the tablet. CONSTITUTION:When the coil 21 of the position indicator 2 is mounted on the tablet, an oscillation path is composed of a two-phase arrangement grid 11Y, the position indicator 2, a two-phase arrangement grid 11X, and the amplifier of the oscillation system. Then the coil 21 or the two-phase arrangement grids 11X and 11Y of a grid part 10, etc., are excited with an ambient noise or the noise of a changeover switch, etc., an oscillation state is entered through the amplifying operation of the amplifier and the coil 21 produces the stable magnetic field. Voltages are induced between loop coil groups 12X and 12Y through the operation of the produced magnetic field and the voltage values are calculated by an X-position determination part and a Y-position determination part to determine the XY position of the position indicator 2.</p> |
