Loudspeaker module and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10542344-B2
Application number	US-201715850297-A
Country	US
Kind code	B2
Filing date	Dec 21, 2017
Priority date	Sep 1, 2014
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

The present disclosure discloses a loudspeaker module and a manufacturing method thereof. The loudspeaker module comprises an outer casing; the outer casing accommodates a speaker unit; the speaker unit partitions an inner cavity of the whole module into two cavities: a front acoustic cavity and a rear acoustic cavity; the rear acoustic cavity is internally provided with a sound-absorbing material; the rear acoustic cavity is further provided with an isolating structure used for isolating the sound-absorbing material from the speaker unit; the isolating structure partitions the entire rear acoustic cavity into a filling area and a non-filling area; the sound-absorbing material is located in the filling area; the sound-absorbing material is a foaming material; the sound-absorbing material is formed by the foaming of the foaming material and then fills the filling area.

First claim

The invention claimed is:

1. A loudspeaker module, comprising an outer casing, the outer casing comprising a first casing and a second casing which are engaged together, the outer casing accommodating a speaker unit, the speaker unit partitioning an inner cavity of the whole module into two cavities, namely, a front acoustic cavity and a rear acoustic cavity, the speaker unit, the first casing and the second casing jointly enclosing the rear acoustic cavity, the rear acoustic cavity being internally provided with a sound-absorbing material, wherein
the rear acoustic cavity is further provided with an isolating structure used for isolating the sound-absorbing material from the speaker unit, the isolating structure is vertically disposed between the first casing and the second casing, the isolating structure is a net-shaped thin sheet structure, the isolating structure and the outer casing are engaged by injection molding or adhesion;
the isolating structure partitions the entire rear acoustic cavity into a filling area and a non-filling area, the isolating structure is provided with pores allowing air stream to circulate between the filling area and non-filling area, an upper end of the filling area is provided with a groove extending above the filling area, and a lower end of the filling area is provided with a groove extending below the filling area, each of the grooves is a triangular groove with a large opening and a pointed bottom; and
the sound-absorbing material is located in the filling area, the sound-absorbing material is a foaming material, the sound-absorbing material is formed by the foaming of the foaming material, and the sound-absorbing material has a structure identical with the structure of the filling area and fills the entire filling area.

2. The loudspeaker module according to claim 1 , wherein the speaker unit comprising a vibration system and a magnetic circuit system, the magnetic circuit system comprises a basin-like stand fixed on the second casing, an inner magnet and an inner washer are fixed in turn at a middle position inside the basin-like stand, an outer magnet and an outer washer are fixed in turn at an edge portion inside the basin-like stand, a positioning recess is formed on one side of the outer washer adjacent to the second casing, a positioning boss is provided at a position on an inner wall of the second casing corresponding to the positioning recess, and the positioning boss is engaged at the positioning recess.

3. The loudspeaker module according to claim 1 , wherein the sound-absorbing material has a structure in which one side of its cross section is a stepped surface and the other side of its cross section is an arcuate surface, or a structure in which two sides of its cross section are both stepped surfaces, or a structure in which one side of its cross section is a stepped surface and the other side of its cross section is a planar surface.

4. The loudspeaker module according to claim 1 , wherein the isolating structure is made of a plastic material or metallic material.

5. A manufacturing method of a loudspeaker module, wherein the method comprising:
forming an outer casing, the outer casing comprises a first casing and a second casing which are engaged together, the casings are engaged together and jointly enclose an inner cavity;
accommodating a speaker unit in the inner cavity, the speaker unit partitions the inner cavity into two cavities, namely, a front acoustic cavity and a rear acoustic cavity, the speaker unit, the first casing and the second casing jointly encloses the rear acoustic cavity;
providing an isolating structure in the rear acoustic cavity, the isolating structure is vertically disposed between the first casing and the second casing, the isolating structure is a net-shaped thin sheet structure, the isolating structure and the outer casing are engaged by injection molding or adhesion;
partitioning, by the isolating structure, the entire rear acoustic cavity into a filling area and a non-filling area, the isolating structure is provided with pores allowing air stream to circulate between the filling area and the non-filling area, an upper end of the filling area is provided with a groove extending above the filling area, and a lower end of the filling area is provided with a groove extending below the filling area, each of the grooves is a triangular groove with a large opening and a pointed bottom;
putting a foaming material in the filling area, and sealing the rear acoustic cavity; and
forming a sound-absorbing material by the foaming of the foaming material, the sound-absorbing material has a structure identical with the structure of the filling area and fills the entire filling area.

6. The manufacturing method according to claim 5 , wherein the foaming material is a solid material, it is first placed in the filling area, and then the rear acoustic cavity is sealed.

7. The manufacturing method according to claim 5 , wherein the foaming material is a liquid material, the rear acoustic cavity is sealed first, and then the foaming material is injected through a leakage hole of the rear acoustic cavity into the filling area.

8. The manufacturing method according to claim 5 , wherein the speaker unit comprising a vibration system and a magnetic circuit system, the magnetic circuit system comprises a basin-like stand fixed on the second casing, an inner magnet and an inner washer are fixed in turn at a middle position inside the basin-like stand, an outer magnet and an outer washer are fixed in turn at an edge portion inside the basin-like stand, a positioning recess is formed on one side of the outer washer adjacent to the second casing, a positioning boss is provided at a position on an inner wall of the second casing corresponding to the positioning recess, and the positioning boss is engaged at the positioning recess.

9. The manufacturing method according to claim 5 , wherein the sound-absorbing material has a structure in which one side of its cross section is a stepped surface and the other side of its cross section is an arcuate surface, or a structure in which two sides of its cross section are both stepped surfaces, or a structure in which one side of its cross section is a stepped surface and the other side of its cross section is a planar surface.

10. The manufacturing method according to claim 5 , wherein the isolating structure is made of a plastic material or metallic material.

Assignees

• Goertek Inc

Inventors

• Yang Xinfeng
• Xu Tongyan
• Ji Pengcheng

Classifications

• H04R1/288 Primary

  for loudspeaker transducers · CPC title

• H04R2201/029

  Manufacturing aspects of enclosures transducers · CPC title

• H04R9/025

  Magnetic circuit · CPC title

• H04R9/06

  Loudspeakers · CPC title

• H04R31/00

  Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor {(manufacture of microstructural arrangements of deformable or non-deformable structures in general B81C1/00182)} · CPC title