Piezoelectric electroacoustic transducer

• US 9,302,292 B2
• Filed: 12/09/2014
• Issued: 04/05/2016
• Est. Priority Date: 03/14/2014
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lin, Chia-Hsin, Sheu, Ching-Iuan
• Primary Examiner(s): NGUYEN, TUAN DUC
• Application Number:
  US14/564,609
• Publication Number:
  US 20150258574A1
• Time in Patent Office: 483 Days
• Field of Search: 381/190
• US Class Current: 1/1
• CPC Class Codes: B06B 1/0644 using a single piezoelectric element B06B1/0688 takes precedence
• CPC Class Codes: G10K 9/122 using piezoelectric driving means G10K9/121 takes precedence
• CPC Class Codes: H04R 1/2869 Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
• CPC Class Codes: H04R 17/00 Piezoelectric transducers; Electrostrictive transducers piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners H10N30/00
• CPC Class Codes: H04R 31/00 Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor manufacture of microstructural arrangements of deformable or non-deformable structures in general B81C1/00182

Abstract

A piezoelectric electroacoustic transducer is provided, including a three-dimensional structure, at least a piezoelectric element, and at least a membrane. The three-dimensional structure is formed to have a top portion and a side portion integrally connected to the top portion by press molding a plate. The side portion has at least a gap and is separated into a plurality of pillars by the at least a gap. The at least a piezoelectric element is disposed on the top portion, and the at least a membrane covers the at least a gap of the side portion. The piezoelectric electroacoustic transducer in the present disclosure is capable of being implemented as a loudspeaker or a microphone.

Claims

1. A piezoelectric electroacoustic transducer, comprising:

a three-dimensional structure, including a top portion and a side portion integrally connected to the top portion, wherein the side portion has at least a gap;

at least a piezoelectric element provided on the top portion; and

at least a membrane covering the at least a gap of the side portion.

2. The piezoelectric electroacoustic transducer of claim 1, wherein the three-dimensional structure is formed to have the top portion and the side portion integrally connected to the top portion by press molding a plate.

3. The piezoelectric electroacoustic transducer of claim 1, wherein the side portion is separated into a plurality of pillars by the at least a gap.

4. The piezoelectric electroacoustic transducer of claim 3, wherein the side portion has 3 to 24 pillars.

5. The piezoelectric electroacoustic transducer of claim 3, wherein the pillar has a width within a range of 2 mm to 6 mm.

6. The piezoelectric electroacoustic transducer of claim 3, wherein the pillar is trapezoid, rectangular, or triangular.

7. The piezoelectric electroacoustic transducer of claim 1, wherein the top portion is rectangular, circular, or elliptical.

8. The piezoelectric electroacoustic transducer of claim 1, wherein the piezoelectric element is rectangular, circular, or elliptical.

9. The piezoelectric electroacoustic transducer of claim 1, wherein the top portion has an inner surface and an outer surface opposing the inner surface, and the piezoelectric element is provided on at least one of the inner surface and the outer surface.

10. The piezoelectric electroacoustic transducer of claim 1, further comprising at least a through hole formed on the top portion, the side portion, or the membrane.

11. The piezoelectric electroacoustic transducer of claim 1, wherein the membrane is made of organic macromolecule and has a thickness within a range of 10 μ

m to 300 μ

m.

12. The piezoelectric electroacoustic transducer of claim 1, wherein the three-dimensional structure is made of a metal plate or a sandwich composite consisting of a metal plate, a polymer film and a metal plate in series and having a thickness within a range of 30 μ

m to 200 μ

m.