| 摘要 |
PCT No. PCT/GB85/00461 Sec. 371 Date Aug. 15, 1986 Sec. 102(e) Date Aug. 15, 1986 PCT Filed Oct. 14, 1985 PCT Pub. No. WO86/02506 PCT Pub. Date Apr. 24, 1986.Proximity sensor apparatus has at least first and second antenna strips arranged along the edge of a structure. The antenna strips receive signals reflected by an object whose proximity is to be detected. Signal processing circuitry is coupled to the antenna strips for receiving and processing the signals picked up by the antenna strips. Proximity detection may occur when the difference in signal strength received by the two antenna strips exceeds a threshold level. In one embodiment, the difference between the maximum and minimum signals is determined and increases the threshold as the difference between signals decreases. In another embodiment, the difference in signal strength is used to determine the position of the object on one side or another of the antenna strips. In yet another embodiment, a bootstrap electrode is positioned behind a single antenna strip and is electrically connected to follow the voltage induced on the antenna strip by the received signal.
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