| 摘要 |
PCT No. PCT/JP93/00230 Sec. 371 Date Dec. 29, 1993 Sec. 102(e) Date Dec. 29, 1993 PCT Filed Feb. 25, 1993 PCT Pub. No. WO93/18448 PCT Pub. Date Sep. 16, 1993A position reading apparatus and keyboard apparatus using a feedback loop for inputting positional information into an external device. A pointer having a resonant circuit is used to establish a feedback loop having as part of the feedback loop a first coupling device a second coupling device, an amplifier and the resonant circuit. When the resonant circuit approaches the first and second coupling devices electromagnetic coupling is established between the position pointer and the first and second coupling device. As a result, oscillation occurs at a resonant frequency of the resonant circuit establishing an oscillation signal. The oscillation signal information determines the position of the pointer. Switches are used to alter the resonant frequency of the resonant circuit.
|
