Cylindrical piezoelectric transducer and cylindrical piezoelectric vibrating element
AssigneeToray Techno Co., Ltd.
InventorsTakao Nakayama, Hideyuki Kataoka, Shinichi Sakamoto
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Abstract
A cylindrical piezoelectric transducer includes a columnar holder and a vibrating element comprising a cylindrical piezoelectric polymer membrane positioned around the holder with clearance between the inner peripheral surface of the vibrating element and the outer peripheral surface of the holder, with a peripheral fixing portion provided at one peripheral end of the vibrating element to secure the vibrating element to the holder. The vibrating element comprises a cylindrical piezoelectric polymer membrane comprising a piezoelectric polymer membrane tape having a joined portion formed by abutting both edges of the piezoelectric polymer membrane tape in the width-wise direction.
Claims17
A cylindrical piezoelectric transducer comprises a columnar holder, a vibrating element comprising a cylindrical piezoelectric polymer membrane provided around said holder with a clearance between the inner peripheral surface of said vibrating element and the outer peripheral surface of said holder, a fixing portion comprising a protruding portion formed along the periphery of said holder to fix said vibrating element at one peripheral end portion thereof to said holder, and a fixing ring provided on the outer surface of said vibrating element at said protruding portion to secure said vibrating element to said holder.
A cylindrical piezoelectric transducer comprises a columnar holder, a vibrating element comprising a cylindrical piezoelectric polymer membrane provided around said holder with a clearance between the inner peripheral surface of said vibrating element and the outer peripheral surface of said holder, a fixing portion comprising a protruding portion formed along the periphery of said holder to fix said vibrating element at one peripheral end portion thereof to said holder, and a tapered outer surface formed on said protruding portion to secure said vibrating element to said holder.
A cylindrical piezoelectric vibrating element comprises a cylindrical piezoelectric polymer membrane comprising a piezoelectric polymer membrane tape having a joined portion formed by butting transverse width-wise edges of said piezoelectric polymer membrane tape with each other, wherein an adhesive tape having a predetermined length pasted on at least one of the outer and inner surfaces of said piezoelectric polymer membrane tape, across said width-wise edges of said piezoelectric polymer membrane tape.
A cylindrical piezoelectric transducer comprising:
- a. a columnar holder;
- b. a cylindrical uniform thickness piezoelectric polymer membrane annularly positioned about said holder and radially spaced from a central portion thereof;
- c. said holder comprising:
- i. an annular protruding portion at one end of said holder adapted for use in fixing said membrane to said holder;
- and
- ii. a fixing ring annularly contacting said membrane radially outboard of said protruding portion, for urging said membrane inwardly against said protruding portion and thereby fixing said membrane to said holder.
Dependencies are inferred from the claim text.