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1. (WO2001035470) COMBINED PIEZOELECTRIC SILENT ALARM/BATTERY CHARGER

Pub. No.:    WO/2001/035470    International Application No.:    PCT/US2000/030458
Publication Date: Fri May 18 01:59:59 CEST 2001 International Filing Date: Tue Nov 07 00:59:59 CET 2000
IPC: G08B 3/10
H01L 41/113
H02J 7/00
H04M 1/725
Applicants: CTS CORPORATION
Inventors: HALL, Dale, G.
Title: COMBINED PIEZOELECTRIC SILENT ALARM/BATTERY CHARGER
Abstract:
A communication device such as a pager or cellular telephone which requires battery power, uses a piezoelectric device as both a vibrating alarm and a battery charger. The apparatus comprises a support beam (56) carrying out or two piezoelectric layers (68) and a wright member (62). Via a rectifier (22) it provides DC current to charge a battery (28) when switching means (16, 34, 52, 54, 70) are accordingly set. When receiving an incoming call/paging signal, switching means preset to provide an AC signal to the vibrator (12) thus issuing the vibrating alarm.