Loudspeaker motor and suspension system

Patent metadata

Field	Value
Publication number	US-10051374-B2
Application number	US-201715845514-A
Country	US
Kind code	B2
Filing date	Dec 18, 2017
Priority date	Apr 15, 2016
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A loudspeaker is provided with a magnet assembly with an overall length aligned along a longitudinal axis and a frame with a wall encircled around the magnet assembly with a length aligned along the longitudinal axis, wherein the magnet assembly and the wall define a voice coil gap. The loudspeaker is also provided with a voice coil disposed in the voice coil gap; wherein the magnet assembly is symmetrically aligned with the wall such that a halfway point of the overall length of the magnet assembly coincides with a midpoint of the length of the wall.

First claim

What is claimed is:

1. A loudspeaker comprising:
a back plate;
a magnet assembly supported by the back plate and aligned along a longitudinal axis;
an outer wall encircled around the magnet assembly with a first end and a second end longitudinally spaced apart from the first end, wherein the magnet assembly and the outer wall form a voice coil gap;
a first basket extending radially outward from the first end of the outer wall for supporting a diaphragm;
a second basket extending radially outward from the second end of the outer wall and supported by the back plate; and
a voice coil disposed in the voice coil gap with a first side coupled to the first basket and a second side coupled to the second basket, wherein the first basket and the second basket collectively support the voice coil in a balanced state;
wherein the voice coil is symmetrically aligned with the magnet assembly such that the magnet assembly includes an overall length along the longitudinal axis and the voice coil includes an overall length along the longitudinal axis, wherein a halfway point of the overall length of the magnet assembly coincides with a halfway point of the overall length of the voice coil when the voice coil is at rest.

2. The loudspeaker of claim 1 , wherein the voice coil is symmetrically aligned with the outer wall such that the outer wall includes an overall length along the longitudinal axis, wherein a halfway point of the overall length of the outer wall coincides with the halfway point of the overall length of the voice coil when the voice coil is at rest.

3. The loudspeaker of claim 2 , wherein the overall length of the outer wall is equal to the overall length of the magnet assembly.

4. The loudspeaker of claim 2 , wherein the overall length of the outer wall is less than the overall length of the magnet assembly.

5. The loudspeaker of claim 4 , wherein the overall length of the outer wall is less than the overall length of the voice coil.

6. The loudspeaker of claim 1 , wherein the outer wall includes a first projection that extends toward the magnet assembly.

7. The loudspeaker of claim 6 , wherein the outer wall includes a second projection that extends toward the magnet assembly and is longitudinally spaced from the first projection.

8. The loudspeaker of claim 7 , wherein the first projection extends from a first end of the outer wall, and the second projection extends from a second end of the outer wall.

9. The loudspeaker of claim 8 , wherein the voice coil gap includes a first width that is measured transversely to the longitudinal axis and between the magnet assembly and the first projection, a second width that is measured transversely to the longitudinal axis and between the magnet assembly and the second projection, and a third width that is measured transversely to the longitudinal axis and between the magnet assembly and a location between the first projection and the second projection on the outer wall, wherein the first width is less than the third width, and the second width is less than the third width.

10. The loudspeaker of claim 9 , wherein the first width is equal to the second width.

11. The loudspeaker of claim 8 , wherein the voice coil is positioned between the first projection and the second projection in the voice coil gap.

12. The loudspeaker of claim 1 , wherein the voice coil is attached to the first basket and the second basket.

13. The loudspeaker of claim 1 , wherein the magnet assembly includes a first half separated from a second half through the halfway point of the magnet assembly, wherein the first half of the magnet assembly is symmetrical to the second half of the magnet assembly.

14. A loudspeaker comprising:
a magnet assembly with an overall length aligned along a longitudinal axis;
a frame with
a wall encircled around the magnet assembly, the wall having a first end and a second end spaced apart from the first end by a length aligned along the longitudinal axis, wherein the magnet assembly and the wall define a voice coil gap,
a first basket extending angularly outward from the first end of the wall for supporting a diaphragm, and
a second basket extending angularly outward from the second end of the wall and coupled to a back plate for supporting the loudspeaker; and

a voice coil disposed in the voice coil gap;
wherein the magnet assembly is symmetrically aligned with the wall such that a halfway point of the overall length of the magnet assembly coincides with a midpoint of the length of the wall.

15. The loudspeaker of claim 14 , wherein the voice coil includes an overall height along the longitudinal axis and is symmetrically aligned with the magnet assembly and the wall when the voice coil is at rest such that an intermediate point of the overall height of the voice coil coincides with the halfway point of the overall length of the magnet assembly and the midpoint of the length of the wall.

16. The loudspeaker of claim 14 , wherein the magnet assembly includes a first magnetic flux flow loop and a second magnetic flux flow loop.

17. The loudspeaker of claim 14 , wherein the length of the wall is equal to the overall length of the magnet assembly.

18. The loudspeaker of claim 14 , wherein the wall includes a first projection that extends toward the magnet assembly and a second projection that extends toward the magnet assembly and is longitudinally spaced from the first projection.

19. The loudspeaker of claim 18 , wherein the first projection extends from a first end of the wall, and the second projection extends from a second end of the wall.

20. The loudspeaker of claim 19 , wherein the voice coil gap includes a first width that is measured transversely to the longitudinal axis and between the magnet assembly and the first projection, a second width that is measured transversely to the longitudinal axis and between the magnet assembly and the second projection, and a third width that is measured transversely to the longitudinal axis and between the magnet assembly and a location between the first projection and the second projection on the wall, wherein the first width is less than the third width, and the second width is less than the third width.

Assignees

• Harman Int Ind

Inventors

• Sterling Brian

Classifications

• H04R9/04

  Construction, mounting, or centering of coil · CPC title

• H04R7/16 Primary

  Mounting or tensioning of diaphragms or cones · CPC title

• H04R2209/041

  Voice coil arrangements comprising more than one voice coil unit on the same bobbin · CPC title

• H04R9/046

  Construction · CPC title

• H04R9/045

  Mounting (H04R9/043 takes precedence) · CPC title