Piezoelectric bending transducer and the use thereof

US5079472A · kind A · utility

Assignees

• Hoechst Ceramtec AG · DE
• Hoerbiger Fluidtechnik GmbH · AT

Inventors

• Thomas Uhl · Selb, DE
• Herbert Frisch · Wien, AT

Key dates

• Filing date: Jun 22, 1990
• Grant date: Jan 7, 1992
• Expiry date: Jun 22, 2010

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N30/2047
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A piezoelectric bending transducer is described which is suitable for installation in a valve channel. It is composed of at least one ceramic layer which is metalized on both sides and has piezoelectric properties and which is polarized such that on application of a voltage it undergoes a change in length, and of at least one rigid molding which is joined to the whole surface thereof and has approximately the same surface dimensions and which on application of a voltage does not undergo an elongation or undergoes an opposite elongation. The piezoceramic layer contains an unmetallized area which has a roughness R.sub.a of less the 0.5 .mu.m and covers an orifice in the valve channel.