Bone conduction speaker and compound vibration device thereof
The present disclosure 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 disclosure 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 bone conduction speaker, comprising:
a vibration device comprising a vibration conductive plate and a vibration board, wherein
the vibration conductive plate is physically connected with the vibration board, vibrations generated by the vibration conductive plate and the vibration board have at least two resonance peaks, frequencies of the at least two resonance peaks being catchable with human ears, and sounds are generated by the vibrations transferred through a human bone;
at least one microphone disposed in a housing of the bone conduction speaker; and
a waterproof mesh cloth having a waterproof function, wherein the waterproof mesh cloth is outside a periphery of the at least one microphone.
2. The bone conduction speaker according to claim 1 , further comprising a bracket disposed with a microphone hole corresponding to the at least one microphone, and the waterproof mesh cloth is sandwiched between the at least one microphone and the bracket.
3. The bone conduction speaker according to claim 1 , wherein the waterproof mesh cloth is directly adhered to the periphery of the at least one microphone.
4. The bone conduction speaker according to claim 1 , wherein the at least one microphone corresponds to a sound guiding channel wrapped around the periphery of the at least one microphone, and the waterproof mesh cloth is disposed inside the sound guiding channel.
5. The bone conduction speaker according to claim 1 , wherein the at least one microphone corresponds to at least one microphone component including a waterproof membrane component.
6. The bone conduction speaker according to claim 5 , further comprising:
the housing being disposed with a first sound inlet;
an annular blocking wall integrally formed on an inner surface of the housing and disposed on a periphery of the first sound inlet, thereby defining an accommodation space connected to the first sound inlet;
the waterproof membrane component disposed inside the accommodation space, and covering the first sound inlet; and
a rigid support plate disposed in the accommodation space and pressed the waterproof membrane component on the inner surface of the housing, the rigid support plate being disposed with a second sound inlet.
7. The bone conduction speaker according to claim 6 , wherein
the waterproof membrane component includes a waterproof membrane body and a first annular rubber gasket disposed on one side of the waterproof membrane body towards the rigid support plate,
the first annular rubber gasket is disposed on the periphery of the first sound inlet and a periphery of the second sound inlet, and
the rigid support plate is pressed against the first annular rubber gasket.
8. The bone conduction speaker according to claim 7 , wherein the first annular rubber gasket is arranged to form a sealed chamber communicating to the microphone and only through the second sound inlet between the waterproof membrane body and the rigid support plate.
9. The bone conduction speaker according to claim 7 , wherein the waterproof membrane component further includes a second annular rubber gasket disposed on one side of the waterproof membrane body towards the inner surface of the housing and overlapped the first annular rubber gasket.
10. The bone conduction speaker according to claim 7 , wherein the waterproof membrane body includes a waterproof and sound-transmitting membrane.
11. The bone conduction speaker according to claim 1 , wherein the vibration conductive plate includes a first torus and at least two first rods, the at least two first rods converging to a center of the first torus.
12. The bone conduction speaker according to claim 11 , wherein the vibration board includes a second torus and at least two second rods, the at least two second rods converging to a center of the second torus.
13. The bone conduction speaker according to claim 12 , wherein the first torus is fixed on a magnetic component.
14. The bone conduction speaker according to claim 13 , further comprising a voice coil, wherein the voice coil is driven by the magnetic component and fixed on the second torus.
15. The bone conduction speaker according to claim 14 , wherein the at least two first rods are staggered with the at least two second rods.
16. The bone conduction speaker according to claim 15 , wherein a staggered angle between one of the at least two first rods and one of the at least two second rods is 60 degrees.
17. The bone conduction speaker according to claim 14 , wherein the magnetic component comprises:
a bottom plate;
an annular magnet attaching to the bottom plate;
an inner magnet concentrically disposed inside the annular magnet;
an inner magnetic conductive plate attaching to the inner magnet;
an annular magnetic conductive plate attaching to the annular magnet; and
a grommet attaching to the annular magnetic conductive plate.
18. The bone conduction speaker according to claim 1 , wherein the vibration conductive plate is made of stainless steels and has a thickness in a range of 0.1 to 0.2 mm.
19. The bone conduction speaker according to claim 1 , wherein a lower resonance peak of the at least two resonance peaks is equal to or lower than 900 Hz.
20. The bone conduction speaker according to claim 19 , wherein a higher resonance peak of the at least two resonance peaks is equal to or lower than 9500 Hz.