Magnetic circuit structure of a transducer, a transducer and an electronic device comprising the same

Patent metadata

Field	Value
Publication number	US-11902764-B2
Application number	US-201917628272-A
Country	US
Kind code	B2
Filing date	Aug 13, 2019
Priority date	Jul 19, 2019
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

Disclosed is a magnetic circuit structure of a transducer comprising a static magnetic field generating device which comprises magnet sets, the magnet sets comprise a first magnet set magnetized in a moving direction of the transducer, a second magnet set and a third magnet set located in a direction orthogonal to a static magnetic field generated by the first magnet set, a magnetization direction of the second magnet set is orthogonal to that of the first magnet set, a magnetization direction of the third magnet set is orthogonal to that of the second and first magnet sets, the second and third magnet sets increase a magnetic induction intensity of the static magnetic field. The magnetic circuit structure of the transducer in the present disclosure can effectively solve the problem that a driving force of the transducer applying thereof is not sufficient, thus increasing the efficiency of electric-to-mechanical conversion.

First claim

What is claimed is:

1. A magnetic circuit structure of a transducer, wherein the magnetic circuit structure comprises a static magnetic field generating device, the static magnetic field generating device comprises magnet sets,
wherein the magnet sets comprise a first magnet set that is magnetized in a moving direction of the transducer, a second magnet set that is located in a direction orthogonal to a static magnetic field generated by the first magnet set, and a third magnet set disposed in a direction orthogonal to static magnetic fields generated by the first magnet set and the second magnet set, and
wherein a magnetization direction of the second magnet set is orthogonal to a magnetization direction of the first magnet set, a magnetization direction of the third magnet set is orthogonal to the magnetization directions of the second magnet set and the first magnet set, and the second magnet set and third magnet set are provided to increase magnetic induction intensity of the static magnetic field.

2. The magnetic circuit structure of the transducer of claim 1 , wherein the first magnet set comprises at least two permanent magnets disposed opposite to each other to form the static magnetic field, the second magnet set comprises first magnetism gathering permanent magnets disposed on both sides of at least one of the permanent magnets, and the third magnet set comprises second magnetism gathering permanent magnets located on both sides of the static magnetic field and between the first magnet set and the second magnet set.

3. The magnetic circuit structure of the transducer of claim 2 , wherein the permanent magnets for generating the static magnetic field are disposed in pairs and the permanent magnets of each pair are opposite to each other, the permanent magnets are magnetized in the moving direction of the transducer, and polarities of opposite ends of the permanent magnets that are opposite to each other of each pair are configured to be opposite,
wherein the third magnet set is correspondingly provided between two adjacent sets of permanent magnets on each side of the static magnetic field generated by the first magnet set and the second magnet set, and
wherein the polarities of the two second magnetism gathering permanent magnets at ends close to the same static magnetic field are configured to be opposite.

4. The magnetic circuit structure of the transducer of claim 1 , wherein the first magnet set comprises a first permanent magnet and a second permanent magnet disposed opposite to each other in the moving direction of the transducer, the first permanent magnet and the second permanent magnet are magnetized in the moving direction of the transducer and form the static magnetic field in the moving direction of the transducer, and adjacent ends of the first permanent magnet and the second permanent magnet have opposite polarities.

5. The magnetic circuit structure of the transducer of claim 4 , wherein the second magnet set comprises a fourth magnet set and a fifth magnet set respectively disposed on both sides of the first permanent magnet and the second permanent magnet, and
wherein each of the fourth magnet set and the fifth magnet set comprises two permanent magnets disposed opposite to each other and located in the direction orthogonal to the static magnetic field generated by the first magnet set, and the two permanent magnets are magnetized in a direction orthogonal to the moving direction and are configured to have the same polarities at ends close to the first permanent magnet and the second permanent magnet.

6. The magnetic circuit structure of the transducer of claim 5 , wherein the third magnet set is arranged in the middle of the magnetic circuit structure of the transducer.

7. The magnetic circuit structure of the transducer of claim 6 , wherein there are two first permanent magnets and two second permanent magnets located on the same side of the static magnetic field, directions of magnetic induction lines inside the two first permanent magnets are opposite, and directions of magnetic induction lines inside the two second permanent magnets are opposite, and
wherein the third magnet set comprises two second magnetism gathering permanent magnets respectively disposed between the two first permanent magnets and between the two second permanent magnets, and directions of magnetic induction lines inside the two third magnet sets are opposite.

8. The magnetic circuit structure of the transducer of claim 4 , wherein a volume of the second permanent magnet is smaller than a volume of the first permanent magnet,
wherein a fifth magnet set comprises a third permanent magnet and a fourth permanent magnet disposed on both sides of the second permanent magnet, and
wherein the third permanent magnet and the fourth permanent magnet are magnetized in the direction orthogonal to the static magnetic field generated by the first magnet set, and have the same polarities at ends close to the second permanent magnet.

9. An electronic device, comprising the magnetic circuit structure of the transducer of claim 1 .

10. The electronic device of claim 9 , wherein the electronic device is a mobile phone, a tablet, a TV, a car audio or a loudspeaker box.

11. A transducer, comprising a fixed member and a movable member, wherein the fixed member comprises:
a static magnetic field generating device, the static magnetic field generating device comprises magnet sets,
wherein the magnet sets comprise a first magnet set that is magnetized in a moving direction of the transducer, and a second magnet set that is located in a direction orthogonal to a static magnetic field generated by the first magnet set, and a third magnet set disposed in a direction orthogonal to static magnetic fields generated by the first magnet set and the second magnet set, and
wherein a magnetization direction of the second magnet set is orthogonal to a magnetization direction of the first magnet set, a magnetization direction of the third magnet set is orthogonal to the magnetization directions of the second magnet set and the first magnet set, and the second magnet set and third magnet set are provided to increase magnetic induction intensity of the static magnetic field.

12. The transducer of claim 11 , wherein the transducer is a magnetic-potential transducer, and the transducer further comprises:
at least one alternating magnetic field generating device configured to generate an alternating magnetic field, the alternating magnetic field is orthogonal or partially orthogonal to the static magnetic field; and
at least one movable device provided with a magnetic conductive material, at least a part of the magnetic conductive material is arranged in an area where the alternating magnetic field overlaps with the static magnetic field, so that the static magnetic field and the alternating magnetic field are converged,
wherein a magnetic field force generated by an interaction between the static magnetic field and the alternating magnetic field is applied to the magnetic conductive material so as to drive the movable member to move.

13. The transducer of claim 12 , wherein the transducer further comprises a suspension device, the magnetic conductive material and the suspension device move together as a whole, and the movable device is suspended in a space where the static magnetic field is located by the suspension device.

14. The transducer of claim 11 , wherein the transducer moves in a vertical direction, the first magnet set is magnetized in the vertical direction, and the second magnet set is magnetized in a horizontal direction.

Assignees

• Goertek Inc

Inventors

• Liu Chunfa
• Zu Fenglei
• Yang Xinfeng

Classifications

• H04R9/025 Primary

  Magnetic circuit · CPC title

• H04R1/025

  Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture · CPC title

• H04R9/06 Primary

  Loudspeakers · CPC title

• H04R13/00 Primary

  Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet · CPC title

• H04R2400/11

  Aspects regarding the frame of loudspeaker transducers · CPC title