| 摘要 |
<p>PURPOSE:To easily secure the expending performance for setting a state and also to simplify the circuit constitution by mounting many switches to a position pointer. CONSTITUTION:The electromagnetic connections M1 and M2 are produced when a resonance circuit 4 provided to a position pointer 5 gets close to the 1st and 2nd connecting means 1 and 2 respectively. Thus, a positive feedback loop is formed with a series of paths consisting of the output of an amplifier circuit 3 and the inputs of the means 1, the connection M1, the circuit 4, the connection M2, the means 2, and the circuit 3 respectively. Then, the oscillation is produced with the resonance frequency of the circuit 4 and an oscillation signal 101 is obtained. The amplitude of the signal 101 varies according to the position of the pointer 5. Thus, a position detecting circuit 6 acquires the position information on the pointer 5 based on the amplitude of the signal 101. Then, a state detecting circuit 8 can detect the information on both switches SW1 and SW2 set by a state setting circuit 7 based on the frequency of the signal 101.</p> |
