Importance

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Abstract

A method for molding capable of molding a piezoelectric polymer into polymer piezoelectric materials having various shapes is provided. A vibration generator using a polymer piezoelectric material and a speaker capable of generating a high sound pressure and achieving flat sound pressure-frequency characteristics are provided. A material formed from a piezoelectric polymer is molded at a temperature not less than the glass transition temperature and less than the crystallization temperature of the piezoelectric polymer and is then heat-treated at a temperature not less than the crystallization temperature of the piezoelectric polymer. A vibration generator comprising a piezoelectric portion formed from a piezoelectric polymer; a first electrode disposed on a first main surface of the piezoelectric portion; and a second electrode disposed on a second main surface of the piezoelectric portion, which has a piezoelectric modulus of 0.5 pC/N or more and satisfies at least one of the following (a) to (c):

(a) the ratio of the length in the longitudinal direction to the thickness of the piezoelectric portion is about 100 or more;(b) the ratio of the curvature radius of a curved portion to the thickness of the piezoelectric portion is about 10 or more; and(c) the ratio of the length in the longitudinal direction to the curvature radius of the curved portion of the piezoelectric portion is about 0.01 or more.

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First Claim