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US 7,030,542 B2Granted
Composite piezoelectric body
AssigneeTayca Corporation
InventorsMakoto Chisaka, Osamu Kobayashi
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Abstract
The present invention proves a piezoelectric composite comprising, as main components, a piezoelectric ceramic and a polymer having a bulk density of 0.4 g/cm3 or less, the polymer including bubbles dispersed therein. Therefore, the piezoelectric composite of the present invention has a reduced bulk density, a high coefficient of electromechanical coupling in spite of the piezoelectric ceramic having a low volume ratio, a reduced acoustic impedance and a good processing character.
Claims2
A piezoelectric composite, comprising:
- a piezoelectric ceramic portion;
- and
- an acrylonitorile copolymer portion having a bulk density of 0.2 g/cm3 or less, wherein the acrylonitorile copolymer portion includes bubbles dispersed therein.
A method for preparing a piezoelectric composite, comprising:
- providing a ceramic portion;
- forming a plurality of grooves on the ceramic portion by means of a mechanical process;
- filling a powder of an acrylonitorile copolymer into the grooves, the powder enclosing a liquid;
- and
- heating the ceramic portion filled with the powder at a temperature to vaporize the liquid, to set and integrate the acrylonitorile copolymer with the ceramic portion, wherein the set acrylonitorile copolymer has a bulk density of 0.2 g/cm3 or less.
2 more elements
Dependencies are inferred from the claim text.