ACOUSTIC TRANSDUCER USING A PIEZOELECTRIC POLYVINYLIDENE FLUORIDE RESIN FILM AS THE OSCILLATOR

• US 3,792,204 A
• Filed: 12/03/1971
• Issued: 02/12/1974
• Est. Priority Date: 12/04/1970
• Status: Expired due to Term

• Current Assignee: Naohiro Murayama, Takao Okiawa
• Original Assignee: Naohiro Murayama, Takao Okiawa
• Inventors: Murayama, Naohiro, Okiawa, Takao
• Primary Examiner(s): Claffy, Kathleen H.
• Assistant Examiner(s): Kundert, Thomas L.
• Application Number:
  US05/204,584
• Time in Patent Office: 802 Days
• Field of Search: 179/111R,111E,11A,11F 307/88ET 310/8.2,8.3
• US Class Current: 310/340
• CPC Class Codes: H01G 7/023 of macromolecular compounds
• CPC Class Codes: H04R 17/005 using a piezoelectric polymer
• CPC Class Codes: H04R 19/01 characterised by the use of electrets
• CPC Class Codes: H10N 30/857 Macromolecular compositions
• CPC Class Codes: Y10S 310/80 Piezoelectric polymers, e.g. PVDF

Abstract

An electrostatic type, electroacoustic transducer having excellent acoustic characteristics is composed of an piezoelectric film of a polyvinylidene fluorine resin having an electroconductive material on the opposite surfaces of the film.

Claims

2. The electrostatic type acoustic transducer as claimed in claim 1 wherein said vinylidene fluoride resin is polyvinylidene fluoride.

3. The electrostatic type acoustic transducer as claimed in claim 1 wherein said vinylidene fluoride resin is a copolymer of vinylidene fluoride and tetrafluoroethylene.

4. The electrostatic type acoustic transducer as claimed in claim 1 wherein the film of said vinylidene fluoride is non-oriented.

5. The electrostatic type acoustic transducer as claimed in claim 1 wherein the film of said vinylidene fluoride resin is oriented.

6. The electrostatic type acoustic transducer as claimed in claim 1 wherein said conductive material is aluminum.