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 speaker, comprising:
a housing;
compound vibration parts residing inside the housing and configured to generate vibrations to produce a sound wave inside the housing, wherein
the compound vibration parts include two or more vibration parts at least partially attached to each other, and
at least one hole located on the housing and configured to guide the sound wave inside the housing to an outside of the housing;
a panel connected with the compound vibration parts;
a vibration transfer layer, a portion of the vibration transfer layer being in contact with the panel, and a portion not being in contact with the panel on the vibration transfer layer having one or more holes configured to guide the sound wave inside the housing to the outside of the housing;
at least two microphones, the at least two microphones including a first microphone with a first orientation and a second microphone with a second orientation different from the first orientation.
2. The speaker according to claim 1 , wherein at least two of the two or more vibration parts having different stiffness coefficients.
3. The speaker according to claim 1 , wherein the two or more vibration parts overlap each other.
4. The speaker according to claim 1 , 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.
5. The speaker according to claim 1 , wherein the first microphone and the second microphone are disposed at different positions of a flexible circuit board, wherein the flexible circuit board is disposed in the speaker.
6. The speaker according to claim 5 , wherein the flexible circuit board includes a main circuit board, a first branch circuit board, and a second branch circuit board, wherein the first branch circuit board and the second branch circuit board are connected to the main circuit board.
7. The speaker according to claim 6 , wherein the second branch circuit board extends perpendicular to the main circuit board.
8. The speaker according to claim 7 , wherein the second microphone is disposed on one end of the second branch circuit board away from the main circuit board.
9. The speaker according to claim 6 , wherein the first microphone is disposed on one end of the first branch circuit board away from the main circuit board.
10. The speaker according to claim 5 , wherein the first microphone and the second microphone are disposed on a first side of the flexible circuit board.
11. The speaker according to claim 10 , wherein a microphone rigid support plate is disposed on a second side of the flexible circuit board, the second side being different from the first side.
12. The speaker according to claim 11 , wherein the microphone rigid support plate includes a first rigid support plate for supporting the first microphone and a second rigid support plate for supporting the second microphone.
13. The speaker according to claim 1 , wherein the housing includes a peripheral side wall and a bottom end wall, wherein the first microphone is fixed on the bottom end wall, and the second microphone is fixed on the peripheral side wall.
14. The speaker according to claim 1 , further comprising a voice coil, wherein the voice coil is driven by a magnetic component and fixed on at least part of the two or more vibration parts.
15. The 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.
16. The speaker according to claim 1 , wherein the vibrations causes a leaked sound wave spreading outside the housing; and the guided sound wave through the at least one hole interferes with the leaked sound wave.
17. The speaker according to claim 1 , wherein the at least one hole on the housing includes at least two holes.
18. The speaker according to claim 1 , wherein the portion being in contact with the panel on the vibration transfer layer is higher than the portion not being in contact with the panel on the vibration transfer layer to form a step structure.
19. The speaker according to claim 1 , wherein the compound vibration parts and the vibration transfer layer are located on opposite sides of the panel.
20. The speaker according to claim 1 , wherein the vibration transfer layer is configured to produce a certain deformation to match a user's skin; and
the vibrations are transferred to human bones through the panel.