Acoustic generator, acoustic generation apparatus, portable terminal, and electronic apparatus
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.
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, wherein the vibration plate is flat and distances between the vibration plate and the piezoelectric body are different,
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 in a state before an AC signal is applied.
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 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.
4. The acoustic generator according to claim 1 , comprising a frame disposed in an outer peripheral part of the vibration plate.
5. An acoustic generator, comprising:
a piezoelectric element having a piezoelectric body; and
a vibration plate joined to the piezoelectric element via a joining material, wherein the vibration plate is flat and distances between the vibration plate and the piezoelectric body are different,
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 in a state before an AC signal is applied when viewed in a longitudinal sectional view of the piezoelectric element.
6. The acoustic generator according to claim 5 , comprising a frame disposed in an outer peripheral part of the vibration plate.
7. An acoustic generator, comprising:
a piezoelectric element having a piezoelectric body; and
a vibration plate joined to the piezoelectric element via a joining material, wherein the vibration plate is flat and distances between the vibration plate and the piezoelectric body are different,
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 in a state before an AC signal is applied.
8. The acoustic generator according to claim 7 , comprising a frame disposed in an outer peripheral part of the vibration plate.
9. An acoustic generation apparatus, comprising:
the acoustic generator according to claim 1 ; and
a housing which contains the acoustic generator.
10. 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.
11. 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.
12. An acoustic generation apparatus, comprising:
the acoustic generator according to claim 5 ; and
a housing which contains the acoustic generator.
13. A portable terminal, comprising:
the acoustic generator according to claim 5 ;
an electronic circuit;
a display; and
a housing,
the vibration plate of the acoustic generator being the display or the housing.
14. An electronic apparatus, comprising:
the acoustic generator according to claim 5 ;
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.
15. An acoustic generation apparatus, comprising:
the acoustic generator according to claim 7 ; and
a housing which contains the acoustic generator.
16. A portable terminal, comprising:
the acoustic generator according to claim 7 ;
an electronic circuit;
a display; and
a housing,
the vibration plate of the acoustic generator being the display or the housing.
17. An electronic apparatus, comprising:
the acoustic generator according to claim 7 ;
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.