Bone conduction speaker

1. A magnetic circuit assembly of a speaker, comprising:

a first magnetic element generating a first magnetic field;

a first magnetic guide element;

at least one second magnetic element configured to surround the first magnetic element, a magnetic gap being configured between the at least one second magnetic element and the first magnetic element, wherein the at least one second magnetic element generates a second magnetic field; and

at least one fourth magnetic element located below the magnetic gap, wherein the at least one fourth magnetic element is connected with the first magnetic element and the second magnetic guide element, and the magnetization direction of the at least one fourth magnetic element and the magnetization direction of the first magnetic element is in a range from 45 degrees to 135 degrees.

2. The magnetic circuit assembly of claim 1 , wherein an included angle between the magnetization direction of the at least one second magnetic element and the magnetization direction of the first magnetic element is not less than 90 degrees.

3. The magnetic circuit assembly of claim 1 , further comprising:

a second magnetic guide element; and

at least one third magnetic element connected with the second magnetic guide element and the at least one second magnetic element.

4. The magnetic circuit assembly of claim 3 , wherein magnetic induction lines generated by the first magnetic element converge to the magnetic gap under an action of at least one of the at least one second magnetic element, the at least one third magnetic element, or the at least one fourth magnetic element.

5. The magnetic circuit assembly of claim 4 , wherein a magnetic induction intensity within the magnetic gap is increased by at least one of the at least one second magnetic element, the at least one third magnetic element, or the at least one fourth magnetic element.

6. The magnetic circuit assembly of claim 3 , wherein an included angle between the magnetization direction of the at least one third magnetic element and the magnetization direction of the first magnetic element is not less than 90 degrees.

7. The magnetic circuit assembly of claim 3 , wherein the first magnetic guide element is connected with an upper surface of the first magnetic element, the second magnetic guide element includes a baseplate and a side wall, and the first magnetic element is connected with the baseplate of the second magnetic guide element.

8. The magnetic circuit assembly of claim 1 , further comprising:

at least one fifth magnetic element connected with an upper surface of the first magnetic guide element, wherein the at least one fifth magnetic element generates a fifth magnetic field, and the fifth magnetic field increases the magnetic field strength of the first magnetic field within the magnetic gap.

9. The magnetic circuit assembly of claim 8 , wherein an included angle between the magnetization direction of the at least one fifth magnetic element and the magnetization direction of the first magnetic element is in a range from 150 degrees to 180 degrees.

10. The magnetic circuit assembly of claim 8 , wherein a ratio of a thickness of the first magnetic element to a sum of the thickness of the first magnetic element, a thickness of the at least one fifth magnetic element, and a thickness of the first magnetic guide element ranges from 0.4 to 0.6.

11. The magnetic circuit assembly of claim 8 , wherein the thickness of the at least one fifth magnetic element is equal to the thickness of the first magnetic element.

12. The magnetic circuit assembly of claim 8 , wherein the thickness of the at least one fifth magnetic element is less than the thickness of the first magnetic element.

13. The magnetic circuit assembly of claim 8 , further comprising:

a third magnetic guide element connected with an upper surface of the fifth magnetic element, wherein the third magnetic guide element is configured to suppress leakage of a field strength of the first magnetic field and the second magnetic field.

14. The magnetic circuit assembly of claim 8 , further comprising:

at least one conductive element connected with at least one of the first magnetic element, the first magnetic guide element, or the second magnetic guide element.

15. A magnetic circuit assembly of a speaker, comprising:

a first magnetic element generating a first magnetic field;

a first magnetic guide element;

a second magnetic guide element configured to surround the first magnetic element, a magnetic gap being configured between the second magnetic guide element and the first magnetic element;

at least one second magnetic element located in the magnetic gap, wherein the at least one second magnetic element generates a second magnetic field

at least one fourth magnetic element, wherein a lower surface of the at least one fourth magnetic element is connected with an upper surface of the second magnetic guide element, and the magnetization direction of the at least one fourth magnetic element and the magnetization direction of the first magnetic element is in a range from 45 degrees to 135 degrees.

16. The magnetic circuit assembly of claim 15 , wherein an included angle between the magnetization direction of the at least one second magnetic element and the magnetization direction of the first magnetic element is in a range from 45 degrees to 135 degrees.

17. The magnetic circuit assembly of claim 15 , further comprising:

at least one third magnetic element connected with the second magnetic guide element.

18. The magnetic circuit assembly of claim 15 , further comprising:

a magnetic shield configured to encompass the first magnetic element, the first magnetic guide element, the second magnetic guide element, and the second magnetic element.

19. A magnetic circuit assembly of a speaker, comprising:

a first magnetic element generating a first magnetic field;

a first magnetic guide element;

a second magnetic guide element, at least a portion of the second magnetic guide element being configured to surround the first magnetic element and a magnetic gap being configured between the second magnetic guide element and the first magnetic element;

at least one second magnetic element connected with an upper surface of the first magnetic guide element, wherein the at least one second magnetic element generates a second magnetic field; and

at least one fourth magnetic element located below the magnetic gap, wherein the at least one fourth magnetic element is connected with the first magnetic element and the second magnetic guide element, and the magnetization direction of the at least one fourth magnetic element and the magnetization direction of the first magnetic element is in a range from 45 degrees to 135 degrees.

20. The magnetic circuit assembly of claim 19 , further comprising:

at least one third magnetic element connected with the second magnetic guide element.