Magnetic-potential loudspeaker and electronic device using the same

Patent metadata

Field	Value
Publication number	US-12114145-B2
Application number	US-201917628386-A
Country	US
Kind code	B2
Filing date	Aug 13, 2019
Priority date	Jul 19, 2019
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

Disclosed are a magnetic-potential loudspeaker and an electronic device using the same. The magnetic-potential loudspeaker comprises: a movable sound generating device provided with a magnetic conductive material, wherein at least a part of the magnetic conductive material is arranged in an area where an alternating magnetic field overlaps with a static magnetic field, 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, the movable sound generating device further comprises a diaphragm and a rigidity adjusting portion arranged on at least one surface of the diaphragm; and at least one suspension device, wherein the suspension device comprises an elastic recovery device, an inner fixing portion of the elastic recovery device is fixed to the diaphragm, an outer fixing portion thereof is fixed to an inside of the magnetic-potential loudspeaker, and the rigidity adjusting portion.

First claim

What is claimed is:

1. A magnetic-potential loudspeaker, comprising:
a movable sound generating device provided with a magnetic conductive material,
wherein at least a part of the magnetic conductive material is arranged in an area where an alternating magnetic field overlaps with a static magnetic field, so that the static magnetic field and the alternating magnetic field are converged, and 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 sound generating device to move,
wherein the movable sound generating device further comprises:
a diaphragm and a rigidity adjusting portion arranged on at least one surface of the diaphragm; and
at least one suspension device, wherein the suspension device comprises an elastic recovery device for providing a restoring force for a reciprocal vibration of the movable sound generating device,

wherein an inner fixing portion of the elastic recovery device is fixed to the diaphragm, an outer fixing portion of the elastic recovery device is fixed to an inside of the magnetic-potential loudspeaker, and
wherein the rigidity adjusting portion, the magnetic conductive material, and the inner fixing portion of the elastic recovery device are staggered.

2. The magnetic-potential loudspeaker of claim 1 , wherein the magnetic conductive material is provided on at least one surface of the diaphragm.

3. The magnetic-potential loudspeaker of claim 1 , wherein the rigidity adjusting portion has a thickness of 500 μm or less.

4. The magnetic-potential loudspeaker of claim 1 , wherein the rigidity adjusting portion is made of a material with a density of less than or equal to 2.7 g/cm 3 , or has a multilayer composite structure including at least the material.

5. The magnetic-potential loudspeaker of claim 1 , wherein the rigidity adjusting portion covers a portion of the diaphragm that is not covered by the magnetic conductive material and the inner fixing portion of the elastic recovery device.

6. The magnetic-potential loudspeaker of claim 1 , wherein the alternating magnetic field is a magnetic field generated by a coil with an alternating current passing therethrough and applied to the magnetic conductive material, and the coil and the magnetic conductive material are arranged in a horizontal direction.

7. The magnetic-potential loudspeaker of claim 1 , wherein the static magnetic field is a magnetic field generated by a permanent magnet, the static magnetic field is arranged on at least one side of the magnetic conductive material in a vertical direction, and the static magnetic field is orthogonal or partially orthogonal to the alternating magnetic field.

8. The magnetic-potential loudspeaker of claim 1 , wherein the magnetic conductive material is provided in a plurality of magnetic conductive materials, each of the magnetic conductive materials has a sheet shape, the magnetic conductive materials are provided in pairs on both surfaces of the diaphragm, and two magnetic conductive materials opposite to each other are staggered in a direction perpendicular to a vibration direction.

9. The magnetic-potential loudspeaker of claim 8 , wherein the plurality of magnetic conductive materials are provided in two sets, and two alternating magnetic fields and two static magnetic fields are correspondingly provided on the loudspeaker.

10. The magnetic-potential loudspeaker of claim 1 , wherein a periphery of the diaphragm is sealed to define a front chamber and a rear chamber of the magnetic-potential loudspeaker.

11. The magnetic-potential loudspeaker of claim 1 , wherein the elastic recovery device has a ring structure as a whole, the outer fixing portion has a closed ring shape, the inner fixing portion has a closed ring shape, and an elastic portion capable of elastic deformation is disposed between the outer fixing portion and the inner fixing portion.

12. The magnetic-potential loudspeaker of claim 1 , wherein the diaphragm includes a central portion, a flexible deformation portion provided around the central portion, and a connection portion provided around the flexible deformation portion and connected with a bracket, wherein the magnetic conductive material is disposed on the central portion, and the flexible deformation portion has a thickness of 50 μm or less and a Young's modulus of 5800 MPa or less.

13. The magnetic-potential loudspeaker of claim 1 , wherein the magnetic conductive material has a relative permeability μ of greater than 1000.

14. The magnetic-potential loudspeaker of claim 1 , wherein the magnetic conductive material is composed of a plurality layers of film materials.

15. An electronic device, comprising the magnetic-potential loudspeaker of claim 1 .

Assignees

• Goertek Inc

Inventors

• Liu Chunfa
• Zu Fenglei
• Yang Xinfeng

Classifications

• H04R9/025 Primary

  Magnetic circuit · CPC title

• H04R7/18

  at the periphery · CPC title

• H04R9/06 Primary

  Loudspeakers · CPC title

• H04R9/045

  Mounting (H04R9/043 takes precedence) · CPC title

• H04R7/16

  Mounting or tensioning of diaphragms or cones · CPC title