Sound absorbing material encapsulation structure for sound production device, and sound production device

1. A sound absorbing material encapsulation structure for a sound production device, comprising:

a rigid cavity wall enclosed to form a cavity of the sound absorbing material encapsulation structure, the cavity is configured to accommodate a sound absorbing material, the rigid cavity wall is provided with air permeability holes arranged in an array, and the air permeability holes are configured to form a channel for air to flow in and out of the sound absorbing material encapsulation structure, and diameters of the air permeability holes are smaller than a diameter of the sound absorbing material;

a bottom plate sealed and connected to one end surface of the rigid cavity wall, the bottom plate is configured to support the sound absorbing material; and

a covering plate provided to cover another end surface of the rigid cavity wall, the covering plate is sealed and connected to the rigid cavity wall.

2. The sound absorbing material encapsulation structure for a sound production device according to claim 1 , wherein the bottom plate and the rigid cavity wall are made of the same material, and the bottom plate is provided with the air permeability holes arranged in an array.

3. The sound absorbing material encapsulation structure for a sound production device according to claim 1 , wherein the air permeability holes are distributed on an entire outer side surface of the rigid cavity wall, and a distance between two adjacent air permeability holes is greater than the diameters of the air permeability holes.

4. The sound absorbing material encapsulation structure for a sound production device according to claim 1 , wherein the rigid cavity wall is made of silicone material.

5. The sound absorbing material encapsulation structure for a sound production device according to claim 4 , wherein the rigid cavity wall is formed by injection-molding or hot pressing.

6. The sound absorbing material encapsulation structure for a sound production device according to claim 1 , wherein the covering plate is made of sound absorbing cotton, and the sound absorbing cotton is sealed and connected to the other end surface of the rigid cavity wall by adhesive.

7. The sound absorbing material encapsulation structure for a sound production device according to claim 1 , wherein at least one partition plate is provided in the sound absorbing material encapsulation structure, the partition plate is perpendicular to the bottom plate, and the partition plate is configured to divide the cavity into two or more accommodating cavities.

8. The sound absorbing material encapsulation structure for a sound production device according to claim 7 , wherein the partition plate is provided with the air permeability holes thereon.

9. The sound absorbing material encapsulation structure for a sound production device according to claim 7 , wherein a thickness of the partition plate is less than or equal to a thickness of the rigid cavity wall.

10. A sound production device, comprising:

a vibration system configured to produce sound by vibration;

a magnetic circuit system configured to provide a magnetic field for the vibration system;

a housing assembly in which the vibration system and the magnetic circuit system are disposed, the housing assembly is configured to form a rear acoustic cavity; and

the sound absorbing material encapsulation structure according to claim 1 , which is disposed in the rear acoustic cavity.