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公开(公告)号：CA1158288A
公开(公告)日：1983-12-06
申请号：CA373671
申请日：1981-03-23
Applicant: NORTHERN TELECOM INC
Inventor： HILLMAN GARTH D
IPC: H01H57/00
Abstract: PIEZOELECTRIC SWITCH USING PIEZOCERAMIC BENDING ELEMENTS, AND IN PARTICULAR A RELAY UTILIZING SUCH ELEMENTS A piezoceramic device has two layers of piezoceramic material bonded together, the layers polarized in opposite directions. The device is used to detect, and indicate, a change of voltage between two conductors and specifically is used between the tip and ring lines of a telephone line having more than one extension, to give a line status indication.
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