Patent ID: 11221721

Abstract:
An electromagnetic induction type coordinate positioning apparatus includes a first induction coil, a second induction coil, a first impedance circuit, a second impedance circuit, and a control circuit. The first induction coil and the first impedance circuit form a first excited current signal and the second induction coil and the second impedance circuit form a second excited current signal. The control circuit controls a first impedance value of the first induction coil to conform to a first predefined value and controls a second impedance value of the second induction coil to conform to a second predefined value, so that a first excited current signal reaching a first predefined level is formed on a current path between the first impedance circuit and the first induction coil, and a second excited current signal reaching a second predefined level is formed on a current path between the second impedance circuit and the second induction coil.