Patent · US Expired

Piezoelectric tone generator and a process for producing it

US5196754A · kind A · utility

11Cited by

16References

20Claims

0Family size

Assignee

Hoechst Ceramtec AG · DE

Inventors

Heinrich Berthold · Erlangen, DE
Thomas Uhl · Selb, DE
Kurt Handschuh · Eckental, DE
Georg Wiesend · Henfenfeld, DE

Key dates

Filing date	May 10, 1991
Grant date	Mar 23, 1993
Priority date	—
Expiry date	May 10, 2011

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/42
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

To produce a piezoelectric tone generator, a layer of filler-free bonding agent whose dynamic viscosity is 800 to 18,000 mPa.multidot.s is applied between a metallized carrier plate and a piezoceramic wafer. The package composed of carrier plate, bonding layer and ceramic plate is pressed together, the quantity of bonding agent being chosen to be so large that during pressing a bead covering the edge of the ceramic wafer is formed. The bonding layer is cured thereafter, firstly catalytically or thermally and then by UV irradiation.

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