Patent · US Expired

Watch having a piezo electric buzzer mechanism

US4004409A · kind A · utility

8Cited by

4References

7Claims

0Family size

Assignee

Gebruder Junghans GmbH · DE

Inventors

Wolfgang Ganter · Schramberg, DE
Albert Ginter

Key dates

Filing date	Jan 29, 1976
Grant date	Jan 25, 1977
Priority date	—
Expiry date	Jan 29, 1996

Classification

Technology area (CPC H)Electricity
CPC primaryH04R7/00
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A watch includes a housing including an apertured sound transmitting housing portion. A diaphragm is carried by the housing. A piezo electric element is carried by one surface of the diaphragm and is oscillatable in response to electrical excitation. Excitation circuitry is connected between the piezo electrical element and a power source of a watch in producing an excitation signal to oscillate the piezo electric element. The diaphragm comprises an electrically insulative material. The excitation circuit is carried by the one surface of the diaphragm, thereby eliminating the need for additional components to carry the excitation circuit.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.