Acoustic generator, acoustic generation apparatus, portable terminal, and electronic apparatus

Patent metadata

Field	Value
Publication number	US-2016353208-A1
Application number	US-201415117516-A
Country	US
Kind code	A1
Filing date	Nov 29, 2014
Priority date	Feb 24, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

There are provided an acoustic generator, an acoustic generation apparatus, a portable terminal and an electronic apparatus, which have an improved sound quality. An acoustic generator includes a piezoelectric element having a piezoelectric body; and a vibration plate joined to the piezoelectric body via a joining material, distances between the vibration plate and the piezoelectric body being different. Since this configuration achieves a clear and sharp sound quality, and has an effect of increasing sound pressure, the acoustic generator having an improved sound quality can be achieved.

First claim

1 . An acoustic generator, comprising:
a piezoelectric element having a piezoelectric body; and a vibration plate joined to the piezoelectric element via a joining material, distances between the vibration plate and the piezoelectric body being different.

2 . The acoustic generator according to claim 1 , wherein the piezoelectric element includes a curved region when viewed in a longitudinal sectional view of the piezoelectric element.

3 . The acoustic generator according to claim 1 , wherein the piezoelectric element has a shape which is elongated in one direction when viewed in a plan view of the piezoelectric element and is curved convex toward the vibration plate side in the one direction.

4 . The acoustic generator according to claim 1 , wherein the piezoelectric element has a shape which is elongated in one direction when viewed in a plan view of the piezoelectric element and is undulated in the one direction when viewed in a longitudinal sectional view of the piezoelectric element.

5 . The acoustic generator according to claim 3 , wherein a portion of the piezoelectric body closest to the vibration plate is located at a position deviated from a center of a length of the piezoelectric element in the one direction.

6 . The acoustic generator according to claim 1 , wherein the piezoelectric element has a shape which is elongated in one direction when in a plan view of the piezoelectric element and is curved convex toward a side opposite to the vibration plate in the one direction.

7 . The acoustic generator according to claim 1 , comprising a frame disposed in an outer peripheral part of the vibration plate.

8 . An acoustic generation apparatus, comprising:
the acoustic generator according to claim 1 ; and a housing which contains the acoustic generator.

9 . A portable terminal, comprising:
the acoustic generator according to claim 1 ; an electronic circuit; a display; and a housing, the vibration plate of the acoustic generator being the display or the housing.

10 . An electronic apparatus, comprising:
the acoustic generator according to claim 1 ; an electronic circuit connected to the acoustic generator; and a housing which contains the electronic circuit and the acoustic generator, the electronic apparatus having a function of generating a sound through the acoustic generator.

Assignees

• Kyocera Corp

Inventors

• Matsuoka Tohru

Classifications

• H04R2201/003

  Mems transducers or their use · CPC title

• H04M1/035

  Improving the acoustic characteristics by means of constructional features of the housing, e.g. ribs, walls, resonating chambers or cavities · CPC title

• H04R17/00 Primary

  Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) · CPC title

• H04R1/028

  associated with devices performing functions other than acoustics, e.g. electric candles · CPC title

• H04R2499/15

  Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops · CPC title