Patent · US Expired

Piezoelectric filter and process for the manufacture thereof

US4234860A · kind A · utility

8Cited by

3References

18Claims

0Family size

Assignee

Draloric Electronic GmbH · DE

Inventors

Heinz O. Schumacher · Seevetal, DE
Hermann Zacharias · Cologne, DE

Key dates

Filing date	Apr 4, 1978
Grant date	Nov 18, 1980
Priority date	—
Expiry date	Apr 4, 1998

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/42
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A piezoelectric filter and the process of making the same in which the filter is enclosed in a capsule or envelope of dielectric material through which the connection for the electrodes extend. Self adhesive spacers on each principal surface of the piezoelectric filter are embossed to provide a spacing for the electrodes with respect to the envelope. In addition, slots or other openings between the embossed areas permit the envelope material to engage a surface of the filter that does not have an electrode for damping purposes. The process of manufacture is dictated by the structure and requires first the placement of the spacer in position with the enclosed areas registering with the electrodes and then the formation of the envelope.

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