Micro speaker structure with novel magnet design

Patent metadata

Field	Value
Publication number	US-12464289-B2
Application number	US-202318482302-A
Country	US
Kind code	B2
Filing date	Oct 6, 2023
Priority date	Jun 30, 2023
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A micro speaker structure is provided. The micro speaker structure includes a substrate, a diaphragm, a coil, a circuit board, and a magnet member. The substrate has a hollow space. The diaphragm is disposed over the substrate and covers the hollow chamber. The coil is embedded in the diaphragm. The circuit board is attached to the substrate. The magnet member is disposed on the circuit board and in the hollow chamber. The magnet member has a first side facing the coil and a second side opposite the first side, wherein the first side includes a first polar area and a second polar area having different polarities.

First claim

What is claimed is:

1 . A micro speaker structure, comprising:
a substrate having a hollow chamber; a diaphragm disposed over the substrate and covering the hollow chamber; a coil embedded in the diaphragm; a circuit board attached to the substrate; and a magnet member disposed on the circuit board and in the hollow chamber, wherein the magnet member has a first side facing the coil and a second side opposite the first side, the first side includes a first polar area and a second polar area having different polarities, and the first side and the second side of the magnet member have different polarities.

2 . The micro speaker structure as claimed in claim 1 , wherein the magnet member has a cylindrical structure, and
wherein the first polar area is located in a central area of the first side, and the second polar area is located in a peripheral area of the first side surrounding the central area.

3 . The micro speaker structure as claimed in claim 2 , wherein the magnet member includes a first magnet having a cylindrical structure and a second magnet having a ring structure surrounding the cylindrical structure, and
wherein the first magnet and the second magnet have different polarities at respective first ends adjacent to the first side and have different polarities at respective second ends adjacent to the second side.

4 . The micro speaker structure as claimed in claim 3 , wherein the magnet member has an opening formed in the first magnet and extending through the first end and the second end of the first magnet.

5 . The micro speaker structure as claimed in claim 3 , wherein the magnet member has an opening around the first magnet and separating the first magnet from the second magnet.

6 . The micro speaker structure as claimed in claim 2 , wherein the magnet member is an integral structure, including a first segment and a second segment, the first segment has a cylindrical structure, and the second segment has a ring structure surrounding the cylindrical structure, and
wherein the first segment and the second segment have different polarities at respective first ends adjacent to the first side and have different polarities at respective second ends adjacent to the second side.

7 . The micro speaker structure as claimed in claim 1 , wherein the magnet member has a cylindrical structure, and
wherein the first polar area is located in a central area of the first side, and the first side further includes a plurality of second polar areas located around the first polar area, with a non-polar area between the first polar area and the second polar areas.

8 . The micro speaker structure as claimed in claim 7 , wherein the magnet member is an integral structure, including a first segment and a plurality of second segments, wherein each of the first segment and the second segments has a cylindrical structure, the second segments are located around the first segment, and the first segment and the second segments are surrounded by a non-polar segment, and
wherein the first segment and the second segments have different polarities at respective first ends adjacent to the first side and have different polarities at respective second ends adjacent to the second side.

9 . The micro speaker structure as claimed in claim 1 , wherein the coil vertically overlaps both the first polar area and the second polar area.

10 . The micro speaker structure as claimed in claim 1 , further comprising:
a package lid wrapped around the substrate and the diaphragm, wherein the package lid has a lid opening that exposes a portion of the diaphragm; and a permanent magnet disposed on the package lid.

11 . The micro speaker structure as claimed in claim 1 , wherein the coil is a multi-layered coil including a first layer and a second layer, and
wherein the first layer has a spiral structure surrounding a central axis of the diaphragm, and the second layer crosses over the spiral structure of the first layer and is electrically connected to the first layer.

12 . The micro speaker structure as claimed in claim 1 , wherein the coil is a multi-layered coil including a first layer and a second layer, and
wherein the first layer comprises a plurality of coaxial segments disposed around a central axis of the diaphragm, and the coaxial segments are electrically connected by the second layer.

13 . The micro speaker structure as claimed in claim 12 , wherein the second layer is disposed symmetrically around the central axis of the diaphragm.

14 . A micro speaker structure, comprising:
a substrate having a hollow chamber; a diaphragm disposed over the substrate and covering the hollow chamber; a coil embedded in the diaphragm; a circuit board attached to the substrate; and a magnet member disposed on the circuit board and in the hollow chamber, wherein the magnet member has a first side facing the coil and a second side opposite the first side, the first side includes a first polar area and a second polar area having different polarities, and the first side has the same polarity as the second side, wherein the magnet member has a cuboid structure, and wherein the first polar area is located in a middle area of the first side, and the first side further includes a third polar area, wherein the second polar area and the third polar area are located on both sides of the first polar area and have the same polarity.

15 . The micro speaker structure as claimed in claim 14 , wherein the magnet member is an integral structure, including a first segment, a second segment and a third segment, each of the first segment, the second segment and the third segment has a cuboid structure, and the second segment and the third segment are located on both sides of the first segment, and
wherein the first segment has a first polarity, and the second segment and the third segment both have a second polarity that is different from the first polarity.

16 . The micro speaker structure as claimed in claim 15 , wherein the magnet member further includes a fourth segment surrounded by the first segment, and the fourth segment has the same polarity as the second segment and the third segment.

17 . A micro speaker structure, comprising:
a substrate having a hollow chamber; a diaphragm disposed over the substrate and covering the hollow chamber; a coil embedded in the diaphragm; a circuit board attached to the substrate; and a magnet member disposed on the circuit board and in the hollow chamber, wherein the magnet member includes a permanent magnet and a magnetic permeability element, the permanent magnet is in direct contact with a top surface of the magnetic permeability element, and the magnetic permeability element has a sidewall extending from the top surface and surrounding the permanent magnet, and wherein a first end of the permanent magnet adjacent to the first side and a second end of the permanent magnet adjacent to the second side have different polarities, and the magnetic permeability element and the first end of the permanent magnet have different polarities.

Assignees

• Fortemedia Inc

Inventors

• Gong Shih-Chin
• Xu Yu-Xuan

Classifications

• H04R9/06 Primary

  Loudspeakers · CPC title

• H04R9/025 Primary

  Magnetic circuit · CPC title

• H04R2499/11

  Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's · CPC title