Sound leakage reduction devices and acoustic output devices
The sound leakage reduction device may include an energy conversion structure, a vibration structure, and a housing. The housing may include a vibration cavity and at least one resonance cavity. The energy conversion structure may be located in the vibration cavity and connected with the vibration structure. The at least one resonance cavity may communicate with the vibration cavity through at least one communication hole. A volume of each resonance cavity may be smaller than a volume of the vibration cavity.
1. A sound leakage reduction device, comprising:
an energy conversion structure, a vibration structure, and a housing, wherein
the housing includes a vibration cavity and at least one resonance cavity,
the energy conversion structure is located in the vibration cavity and connected with the vibration structure,
the at least one resonance cavity communicates with the vibration cavity through at least one communication hole, and
a volume of each resonance cavity is smaller than a volume of the vibration cavity,
wherein
one end of the vibration structure is connected to the energy conversion structure and the other end of the vibration structure is in contact with a user's body part to transmit mechanical vibrations of the energy conversion structure to the user's body part, and
a volume ratio between the each resonance cavity and the vibration cavity is not less than 0.1.
2. The sound leakage reduction device of claim 1 , wherein
the at least one resonance cavity includes multiple resonance cavities,
the multiple resonance cavities are disposed on the same side wall or different side walls of the vibration cavity and in air conduction communication with the vibration cavity through the at least one communication hole.
3. The sound leakage reduction device of claim 2 , wherein
the at least one resonance cavity includes a first resonance cavity and a second resonance cavity,
the first resonance cavity is disposed on a first side wall of the vibration cavity,
the first resonance cavity is in air conduction communication with the vibration cavity through a first communication hole on the first side wall, and
the first resonance cavity is in air conduction communication with the second resonance cavity through a second communication hole on a second side wall of the first resonance cavity.
4. The sound leakage reduction device of claim 2 , wherein
the at least one resonance cavity includes a first resonance cavity and a second resonance cavity,
the first resonance cavity and the second resonance cavity are both disposed on a first side wall of the vibration cavity,
the first resonance cavity is in air conduction communication with the vibration cavity through a first communication hole on the first side wall, and
the second resonance cavity is in air conduction communication with the vibration cavity through a third communication hole on the first side wall.
5. The sound leakage reduction device of claim 2 , wherein
the at least one resonance cavity includes a first resonance cavity and a second resonance cavity,
the first resonance cavity is disposed on a first side wall of the vibration cavity,
the first resonance cavity is in air conduction communication with the vibration cavity through a first communication hole on the first side wall,
the second resonance cavity is disposed on a third side wall of the vibration cavity, and
the second resonance cavity is in air conduction communication with the vibration cavity through a fourth communication hole on the third side wall.
6. The sound leakage reduction device of claim 1 , wherein the at least one resonance cavity includes multiple resonance cavities arranged inside the vibration cavity and formed by multiple baffle plates and a same inner wall of the housing.
7. The sound leakage reduction device of claim 1 , wherein the at least one resonance cavity reduces sound leakage at a specific frequency, the specific frequency being in a range of 20 Hz to 10000 Hz.
8. The sound leakage reduction device of claim 1 , wherein the volume ratio between the each resonance cavity and the vibration cavity is 0.1-1.
9. The sound leakage reduction device of claim 1 , wherein the volume of the each resonance cavity is not greater than 6500 mm 3 .
10. The sound leakage reduction device of claim 9 , wherein the volume of the each resonance cavity is not greater than 2100 mm 3 .
11. The sound leakage reduction device of claim 1 , wherein an area of each communication hole is not less than 0.05 mm 2 .
12. The sound leakage reduction device of claim 1 , wherein a distance between the vibration structure and the housing is in a range of 1 mm to 3 mm.
13. The sound leakage reduction device of claim 1 , wherein a vibration surface area of the vibration structure is in a range of 9 mm 2 to 700 mm 2 .
14. An acoustic output device, comprising a sound leakage reduction device, wherein the sound leakage reduction device includes:
an energy conversion structure, a vibration structure, and a housing, wherein
the housing includes a vibration cavity and at least one resonance cavity,
the energy conversion structure is located in the vibration cavity and connected with the vibration structure,
the at least one resonance cavity communicates with the vibration cavity through at least one communication hole, and
a volume of each resonance cavity is smaller than a volume of the vibration cavity,
wherein
one end of the vibration structure is connected to the energy conversion structure, and the other end of the vibration structure is in contact with a user's body part to transmit mechanical vibrations of the energy conversion structure to the user's body part, and
a volume ratio between the each resonance cavity and the vibration cavity is not less than 0.1.
15. The acoustic output device of claim 14 , wherein
the vibration structure includes a vibration panel and a vibration conduction member,
the vibration conduction member extends into the vibration cavity through an opening of the housing and is connected to a bracket of the housing, and
the energy conversion structure is disposed on the bracket of the housing.
16. The acoustic output device of claim 15 , wherein housing is provided with a bracket hole.
17. The acoustic output device of claim 14 , wherein the vibration structure is elastically connected to the housing.
18. The acoustic output device of claim 15 , wherein the energy conversion structure includes a magnetic circuit device and a vibration transmission sheet, one end of the vibration transmission sheet is connected to the magnetic circuit device, and the other end of the vibration transmission sheet is connected to the bracket of the housing and connected to the vibration conduction member through the bracket of the housing.
19. The sound leakage reduction device of claim 1 , wherein the vibration structure includes:
a vibration panel located at an end of the vibration structure away from the energy conversion structure, and
a vibration conduction member connected to the vibration panel and located at an end of the vibration structure close to the energy conversion structure.
20. The sound leakage reduction device of claim 19 , wherein
the vibration panel is located outside the housing,
one end of the vibration conduction member away from the energy conversion structure is located outside the housing and connected to the vibration panel, and
the other end of the vibration conduction member penetrates through the housing and extends into the vibration cavity.