Acoustic device

1. An acoustic device comprising:

a waterproof vibrating membrane; and

a magnetic component which is disposed below the waterproof vibrating membrane, the magnetic component including a magnet,

wherein the waterproof vibrating membrane includes a first central region as a convex portion which protrudes toward a position where the magnetic component is located, and a concave portion surrounding the first central region which is recessed opposing to a position where the magnetic component is located, and

wherein the magnetic component includes a second central region as a concave pressure buffering portion which is recessed corresponding to a shape of the convex portion of the waterproof vibrating membrane wherein the concave pressure buffering portion is recessed toward a side opposing to a side on which the waterproof vibrating membrane is located, and a convex pressure buffering portion surrounding the second central region which protrudes corresponding to a shape of the concave portion of the waterproof vibrating membrane wherein the convex pressure buffering portion protrudes toward a side on which the waterproof vibrating membrane is located.

2. The acoustic device according to claim 1 , further comprising a protection panel which is disposed above the waterproof vibrating membrane, the protection panel including an opening, wherein the protection panel includes a third central region as a second convex pressure buffering portion corresponding to a shape of the convex portion of the waterproof vibrating membrane wherein the second convex pressure buffering portion protrudes opposing to a side on which the waterproof vibrating membrane is located, and a second concave pressure buffering portion surrounding the third central region and corresponding to a shape of the concave portion of the waterproof vibrating membrane wherein the second concave pressure buffering portion is recessed toward a side on which the waterproof vibrating membrane is located.

3. An acoustic device comprising:

a waterproof vibrating membrane;

a magnetic component which is disposed below the waterproof vibrating membrane, the magnetic component including a magnet; and

a protection panel which is disposed above the waterproof vibrating membrane, the protection panel including an opening,

wherein the waterproof vibrating membrane includes a first central region as a convex portion which protrudes toward a position where the magnetic component is located, and a concave portion surrounding the first central region which is recessed opposing to a position where the magnetic component is located, and

wherein the protection panel includes a second central region as a convex pressure buffering portion which protrudes corresponding to a shape of the convex portion at a position corresponding to the convex portion of the waterproof vibrating membrane wherein the convex pressure buffering portion protrudes opposing to a side on which the waterproof vibrating membrane is located, and a concave pressure buffering portion surrounding the second central region which is recessed corresponding to a shape of the concave portion at a position corresponding to the concave portion of the waterproof vibrating membrane wherein the concave portion is recessed toward a side on which the waterproof vibrating membrane is located.

4. The acoustic device according to claim 1 , further comprising a resonant chamber which resonates with a vibration of the waterproof vibrating membrane.

5. The acoustic device according to claim 3 , further comprising a resonant chamber which resonates with a vibration of the waterproof vibrating membrane.

6. The acoustic device according to claim 4 , further comprising an opening-closing member which opens and closes an airflow path from a side of the waterproof vibrating membrane to a side of the resonant chamber.

7. The acoustic device according to claim 5 , further comprising an opening-closing member which opens and closes an airflow path from a side of the waterproof vibrating membrane to a side of the resonant chamber.

8. The acoustic device according to claim 4 , wherein

the resonant chamber is provided with an opening, and

the opening of the protection panel and through the opening of the resonant chamber are configured to pass water.

9. The acoustic device according to claim 5 , wherein

the resonant chamber is provided with an opening, and

the opening of the protection panel and through the opening of the resonant chamber are configured to pass water.

10. The acoustic device according to claim 6 , wherein

the resonant chamber is provided with an opening, and

the opening of the protection panel and through the opening of the resonant chamber are configured to pass water.

11. The acoustic device according to claim 7 , wherein

the resonant chamber is provided with an opening, and

the opening of the protection panel and through the opening of the resonant chamber are configured to pass water.

12. The acoustic device according to claim 1 , wherein

the magnetic component is composed of the magnet and a pole piece disposed on the magnet, and

the pole piece includes the pressure buffering portion.

13. An acoustic device comprising:

a waterproof vibrating membrane; and

a magnetic component which is disposed below the waterproof vibrating membrane, the magnetic component including a magnet, wherein

the waterproof vibrating membrane includes a first central region as a convex portion and a concave portion surrounding the first central region, and

the magnetic component includes a second central region as a concave pressure buffering portion which is recessed corresponding to a shape of the convex portion of the waterproof vibrating membrane and a convex pressure buffering portion surrounding the second central region which protrudes corresponding to a shape of the concave portion of the waterproof vibrating membrane.