초록 ▼

An object is to flatten a frequency characteristic. For achieving the object, an acoustic generator according to an embodiment includes a piezoelectric element (exciter) and a film (film-like vibrating body). The piezoelectric element receives input of an electric signal and vibrates. The piezoelect

An object is to flatten a frequency characteristic. For achieving the object, an acoustic generator according to an embodiment includes a piezoelectric element (exciter) and a film (film-like vibrating body). The piezoelectric element receives input of an electric signal and vibrates. The piezoelectric element is bonded to the film through a bonding material and the film vibrates together with the piezoelectric element with the vibration of the piezoelectric element. Furthermore, the acoustic generator in the embodiment has voids in the bonding material.

대표청구항 ▼

1. An acoustic generator comprising: an exciter that receives input of an electric signal and vibrates; anda film-like vibrating body to which the exciter is bonded through a bonding material and that vibrates together with the exciter with vibration of the exciter, whereinthe bonding material has v

1. An acoustic generator comprising: an exciter that receives input of an electric signal and vibrates; anda film-like vibrating body to which the exciter is bonded through a bonding material and that vibrates together with the exciter with vibration of the exciter, whereinthe bonding material has voids. 2. The acoustic generator according to claim 1, wherein the voids penetrate through from the exciter side to the vibrating body side. 3. The acoustic generator according to claim 1, wherein more voids are present at the vicinity of the exciter than the voids present at the vicinity of the vibrating body in the bonding material. 4. The acoustic generator according to claim 1, wherein the voids are present at the vibrating body side in the bonding material. 5. The acoustic generator according to claim 1, wherein the voids are present at the exciter side in the bonding material. 6. The acoustic generator according to claim 1, wherein the voids face an interface between the bonding material and the vibrating body. 7. The acoustic generator according to claim 1, wherein the voids face an interface between the bonding material and the exciter. 8. The acoustic generator according to claim 1, wherein the bonding material comprises a protruding portion that protrudes from an outer edge of the exciter. 9. The acoustic generator according to claim 8, wherein the voids are present in the protruding portion. 10. The acoustic generator according to claim 1, wherein a resin layer is provided on the vibrating body so as to embed the exciter. 11. The acoustic generator according to claim 1, wherein the voids are formed into a sphere form. 12. The acoustic generator according to claim 1, wherein the exciter is formed by a piezoelectric element. 13. The acoustic generator according to claim 12, wherein the exciter is formed by a bimorph piezoelectric element. 14. An acoustic generation device comprising: the acoustic generator according to claim 1; anda housing that accommodates the acoustic generator. 15. An electronic device comprising: the acoustic generator according to claim 1;an electronic circuit that is connected to the acoustic generator; anda case that accommodates the electronic circuit and the acoustic generator, whereinthe electronic device has a function of generating sound from the acoustic generator.