Bone conduction speaker and compound vibration device thereof
The present invention relates to a bone conduction speaker and its compound vibration device. The compound vibration device comprises a vibration conductive plate and a vibration board, the vibration conductive plate is set to be the first torus, where at least two first rods inside it converge to its center; the vibration board is set as the second torus, where at least two second rods inside it converge to its center. The vibration conductive plate is fixed with the vibration board; the first torus is fixed on a magnetic system, and the second torus comprises a fixed voice coil, which is driven by the magnetic system. The bone conduction speaker in the present invention and its compound vibration device adopt the fixed vibration conductive plate and vibration board, making the technique simpler with a lower cost; because the two adjustable parts in the compound vibration device can adjust both low frequency and high frequency area, the frequency response obtained is flatter and the sound is broader.
1. A vibration device, comprising:
a housing;
compound vibration parts residing inside the housing and connected to a magnet component, wherein
the compound vibration parts include two or more vibration parts at least partially attached to each other, at least two of the two or more vibration parts having different stiffness coefficients,
the magnet component is configured to drive a voice coil to vibrate,
the vibration of the voice coil drives the compound vibration parts to generate vibrations,
the vibrations of the compound vibration parts produce a sound wave inside the housing and cause a leaked sound wave spreading outside the housing, and
the housing includes a contact surface to contact a user, the contact surface including one or more holes, the one or more holes being configured to guide the sound wave inside the housing through the one or more holes to an outside of the housing, the guided sound wave interfering with the leaked sound wave, and the interfering reduces an intensity of the leaked sound wave.
2. The vibration device according to claim 1 , wherein the two or more vibration parts include a first torus and a second torus, a radius of the first torus is smaller than a radius of the second torus.
3. The vibration device according to claim 1 , wherein the two or more vibration parts overlap each other.
4. The vibration device according to claim 1 , wherein at least part of the compound vibration parts is connected to the housing.
5. The vibration device according to claim 1 , wherein at least one of the two or more vibration parts is an elastic plate.
6. The vibration device according to claim 1 , wherein a thickness of at least one of the two or more vibration parts is in a range of 0.005 mm-3 mm.
7. The vibration device according to claim 6 , wherein a thickness of at least one of the two or more vibration parts is in a range of 0.02 mm-0.5 mm.
8. The vibration device according to claim 1 , wherein a hollow pattern is disposed on at least one of the two or more vibration parts.
9. The vibration device according to claim 8 , wherein an area of the hollow pattern is not less than an area of non-hollow portion on the at least one of the two or more vibration parts.
10. The vibration device according to claim 1 , wherein at least one of the two or more vibration parts has a different thickness distribution.
11. The vibration device according to claim 1 , wherein at least part of the compound vibration parts is fixed on the magnetic component via a grommet.
12. A speaker, comprising a vibration device including:
a housing;
compound vibration parts residing inside the housing and connected to a magnet component, wherein
the compound vibration parts include two or more vibration parts at least partially attached to each other, at least two of the two or more vibration parts having different stiffness coefficients,
the magnet component is configured to drive a voice coil to vibrate,
the vibration of the voice coil drives the compound vibration parts to generate vibrations,
the vibrations of the compound vibration parts produce a sound wave inside the housing and cause a leaked sound wave spreading outside the housing, and
the housing includes a contact surface to contact a user, the contact surface including one or more holes, the one or more holes being configured to guide the sound wave inside the housing through the one or more holes to an outside of the housing, the guided sound wave interfering with the leaked sound wave, and the interfering reduces an intensity of the leaked sound wave.
13. The speaker according to claim 12 , wherein the two or more vibration parts include a first torus and a second torus, a radius of the first torus is smaller than a radius of the second torus.
14. The speaker according to claim 12 , wherein the two or more vibration parts overlap each other.
15. The speaker according to claim 12 , wherein at least part of the compound vibration parts is connected to the housing.
16. The speaker according to claim 12 , wherein at least one of the two or more vibration parts is an elastic plate.
17. The speaker according to claim 12 , wherein a thickness of at least one of the two or more vibration parts is in a range of 0.005 mm-3 mm.
18. The speaker according to claim 12 , wherein at least one of the two or more vibration parts has a different thickness distribution.
19. The vibration device according to claim 1 , where vibrations of the two or more vibration parts generate at least two resonance peaks that are among frequencies catchable with human ears.
20. The vibration device according to claim 1 , where at least part of the compound vibration parts is made of stainless steels, a thickness of the compound vibration parts made of stainless steels is 0.1-0.2 mm.