Piezoelectric filter and process for the manufacture thereof
AssigneeDraloric Electronic GmbH
InventorsHeinz Schumacher, Hermann Zacharias
Life of this patent
Estimating the term…
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.
Claims18
A piezoelectric filter, comprising:
- a resonator including:
- a resonator body, having two opposite principal surfaces, at least one electrode on each of said surfaces, and a respective external connector for each of said electrodes, each of said external connectors being in electric contact with its respective electrode;
- an ian insulating envelope encasing said resonator;
- said connectors extending through said envelope;
- and
- a respective spacer between each of said two principal surfaces of said resonator body and said envelope;
- said spacers each comprising a preformed self-adhesive film and having a first set of regions which register with respective ones of said electrodes and which are maintained out of physical contact with said electrodes, and each of said spacers having a second set of regions that are in contact with said resonator body.
A method of manufacturing a piezoelectric filter, comprising the steps of:
- preparing a resonator including:
- a resonator body having two opposite principal surfaces, at least one electrode on each of said surfaces, and a respective external connector for each of said electrodes, each of said external connectors being in electrical contact with its associated electrode;
- preparing a respective spacer comprising a preformed self-adhesive film for each of said two principal surfaces;
- and
- applying each of said spacers to a respective one of said two principal surfaces, each of said spacers having a first set of regions registering with said electrodes and being maintained out of physical contact with said electrodes, and each of said spacers further having a second set of regions in contact with a respective one of said surfaces of said resonator body.
Dependencies are inferred from the claim text.