Systems and methods for suppressing sound leakage

Patent metadata

Field	Value
Publication number	US-9729978-B2
Application number	US-201415109831-A
Country	US
Kind code	B2
Filing date	Dec 17, 2014
Priority date	Jan 6, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

The present disclosure relates to a method of reducing sound leakage of a bone conduction speaker and a bone conduction speaker thereof. The bone conduction speaker comprises a housing, a vibration board and a transducer. The transducer is located in the housing, and the vibration board is configured to contact with skin and pass vibration. At least one sound guiding hole is set on at least one portion of the housing to guide sound wave inside the housing to the outside of the housing. The guided wave and the leaked sound wave form interference so that the amplitude of the leaked sound wave is reduced.

First claim

What is claimed is:

1. A method of reducing sound leakage, the method comprising:
providing a bone conduction speaker including:
a vibration board;
a transducer configured to cause the vibration board to vibrate;
a housing enclosing the vibration board and the transducer, the transducer causing the housing to vibrate, the vibration of the housing producing a leaked sound wave; and
at least one sound guiding hole located on the housing and configured to guide a sound wave inside the housing through the at least one sound guiding hole to an outside of the housing, the guided sound wave interfering with the leaked sound wave, the interference reducing an amplitude of the leaked sound wave.

2. The method of claim 1 , wherein:
the at least one sound guiding hole includes two sound guiding holes located on the housing.

3. The method of claim 1 , wherein:
the housing includes a bottom or a sidewall; and
the at least one sound guiding hole located on the bottom or the sidewall of the housing.

4. The method of claim 1 , wherein a location of the at least one sound guiding hole is determined based on at least one of: a vibration frequency of the transducer, a shape of the at least one sound guiding hole, a quantity of the at least one sound guiding hole, a target region where the amplitude of the leaked sound wave is to be reduced, or a frequency range within which the amplitude of the leaked sound wave is to be reduced.

5. The method of claim 1 , wherein the at least one sound guiding hole includes a damping layer, the damping layer being configured to adjust a phase and amplitude of the guided sound wave.

6. The method of claim 1 , wherein the guided sound wave includes at least two sound waves having a same phase, the at least two sound waves configured to reduce an amplitude of the leaked sound wave having same wavelength.

7. The method of claim 1 , wherein the guided sound wave includes at least two sound waves having different phases, the at least two sound waves configured to reduce an amplitude of the leaked sound wave having different wavelengths.

8. The method of claim 1 , wherein the at least one sound guiding hole includes at least two portions, the at least two portions being configured to generate at least two sound waves having a same phase and configured to reduce the amplitude of the leaked sound wave having same wavelength.

9. The method of claim 1 , wherein the at least one sound guiding hole includes at least two different portions, the two different portions being configured to generate at least two sound waves having different phases and configured to reduce the amplitude of the leaked sound wave having different wavelengths.

10. A bone conduction speaker comprising:
a transducer configured to cause a vibration board to vibrate;
a housing enclosing the vibration board and the transducer, the transducer causing the housing to vibrate, the vibration of the housing producing a leaked sound wave; and
at least one sound guiding hole located on the housing and configured to guide a sound wave inside the housing through the at least one sound guiding hole to an outside of the housing, the guided sound wave interfering with the leaked sound wave, the interference reducing an amplitude of the leaked sound wave.

11. The bone conduction speaker of claim 10 , wherein:
the housing includes a bottom or a sidewall; and
the at least one sound guiding hole located on the bottom or the sidewall of the housing.

12. The bone conduction speaker of claim 10 , wherein the housing includes a cylindrical sidewall, the at least one sound guiding hold located on the cylindrical sidewall.

13. The bone conduction speaker of claim 12 , wherein the at least one sound guiding hole includes two sound guiding holes.

14. The bone conduction speaker of claim 13 , wherein the two sound guiding holes locate at different heights along the axial direction of the sidewall.

15. The bone conduction speaker of claim 11 , wherein the at least one sound guiding hole locates at the center of the bottom.

16. The bone conduction speaker of claim 10 , wherein the at least one sound guiding hole is a perforative hole.

17. The bone conduction speaker of claim 10 , wherein the at least one sound guiding hole includes a damping layer, the damping layer being configured to adjust a phase and amplitude of the guided sound wave.

18. The bone conduction speaker of claim 17 , wherein the damping layer is a tuning paper, tuning cotton, a nonwoven fabric, a silk, a cotton, a sponge or a rubber.

19. The bone conduction speaker of claim 10 , wherein the shape of the at least one sound guiding hole is circle, ellipse, quadrangle, or linear.

20. The bone conduction speaker of claim 10 , wherein the transducer includes one of:
a magnetic component and a voice coil, or
a piezoelectric ceramics.

Assignees

• Shenzhen Voxtech Co Ltd

Inventors

• Qi Xin
• Liao Fengyun

Classifications

• H04R17/00

  Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) · CPC title

• H04R2460/13

  Hearing devices using bone conduction transducers · CPC title

• H04R1/2811

  for loudspeaker transducers · CPC title

• G10K9/22

  Mountings; Casings · CPC title

• G10K11/26

  Sound-focusing or directing, e.g. scanning · CPC title