| 摘要 |
A contactfree data input device for an electronic calculator which is not limited by the finger size of the operator. The input device includes an input stylus having an element on the end thereof which will initiate an electrical input signal when it is brought into close proximity to a cooperating input circuit means located at a value input location in the input field. According to one embodiment an electret is provided on the stylus and the input circuit means comprises a pair of spaced electrodes. According to a further embodiment, the stylus is provided with a permanent magnet and the input circuit means comprises a ferrite core which is continuously being switched between its magnetization states and which has a separate readout winding.
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