US-12627932-B2 - Loudspeaker and basket thereof

Abstract

A loudspeaker including a speaker basket. The speaker basket includes a first frame including an inner surface and an outer surface opposite the inner surface, and a second frame housed in the first frame. The second frame includes a first wall and a second wall, wherein the first wall and the second wall of the second frame engage the inner surface of the first frame.

Inventors

• Alan Babb

Assignees

• ROBERT BOSCH GMBH

Dates

Publication Date

20260512

Application Date

20240308

Claims (18)

1. 1 . A loudspeaker comprising: a first frame including an inner surface and an outer surface opposite the inner surface; and a second frame housed in the first frame, the second frame including a knee from which extend both a first wall and a second wall at two different angular orientations, the first and second frames forming a speaker basket, wherein the first wall and the second wall of the second frame engage a portion of the inner surface of the first frame that includes a knee forming an angle that matches an angle formed by the knee of the second frame.
2. 2 . The loudspeaker of claim 1 , wherein the first frame is a first stamped steel frame, and the second frame is a second stamped steel frame.
3. 3 . The loudspeaker of claim 1 , wherein the angle of the knees of the first and second frames is greater than 90 degrees and less than 180 degrees when measured at an exterior of the loudspeaker.
4. 4 . The loudspeaker of claim 1 , further comprising a permanent magnetic circuit, wherein the first frame includes a first plurality of mounting apertures, and the first frame is coupled to the permanent magnetic circuit via a plurality of fasteners that extend through the first plurality of mounting apertures.
5. 5 . The loudspeaker of claim 4 , wherein the second frame includes a second plurality of mounting apertures, and the plurality of fasteners extend through the second plurality of mounting apertures.
6. 6 . The loudspeaker of claim 1 , wherein each of the first and second frames has a stepped conical shape concentric about a central axis of the loudspeaker.
7. 7 . The loudspeaker of claim 4 , wherein the first frame includes a first opening on a proximal end of the loudspeaker and the second frame includes a second opening on the proximal end, and wherein the first opening and the second opening receive a portion of the permanent magnetic circuit.
8. 8 . The loudspeaker of claim 7 , wherein the first opening defines a first diameter measured perpendicular to a central axis of the loudspeaker, and the second opening defines a second diameter measured perpendicular to the central axis of the loudspeaker, wherein the second diameter is equal to the first diameter.
9. 9 . The loudspeaker of claim 1 , wherein the second frame is constructed from a sheet and has a thickness of at least 1.0 mm and not more than 1.2 mm.
10. 10 . A speaker basket to house components of a loudspeaker, the speaker basket comprising: a first frame configured to be coupled to a permanent magnetic circuit at a proximal end of the first frame, the first frame including an inner surface and an outer surface; and a second frame configured to engage the inner surface of the first frame, wherein the first frame includes a plurality of struts between the proximal end and a distal end of the first frame, and wherein the second frame has a distal end between the plurality of struts and the proximal end of the first frame.
11. 11 . The speaker basket of claim 10 , wherein the second frame is bonded to the first frame via an adhesive.
12. 12 . The speaker basket of claim 10 , wherein the first frame is constructed from a first sheet and the second frame is constructed from a second sheet, and wherein the first and second sheets form a stepped cone geometry.
13. 13 . A loudspeaker comprising: a permanent magnetic circuit positioned at a proximal end of the loudspeaker; a first frame coupled to the permanent magnetic circuit, the first frame including: a first wall that encircles a central axis defined by the loudspeaker, a second wall that encircles the central axis and defines an angle with the first wall, and a third wall that encircles the central axis and defines an angle with the second wall; and a second frame inside of the first frame and forming a speaker basket therewith, the second frame including: a first wall that encircles the central axis, a second wall that encircles the central axis and defines an angle with the first wall, and a third wall that encircles the central axis and defines an angle with the second wall, wherein the first wall of the first frame engages the first wall of the second frame, wherein the second wall of the first frame engages the second wall of the second frame, and wherein the third wall of the first frame engages the third wall of the second frame.
14. 14 . The loudspeaker of claim 13 , wherein the first frame includes a fourth wall that encircles the central axis and defines an angle with the third wall.
15. 15 . The loudspeaker of claim 14 , wherein the second frame includes a fourth wall that encircles the central axis and defines an angle with the third wall.
16. 16 . The loudspeaker of claim 15 , wherein the fourth wall of the first frame engages the fourth wall of the second frame.
17. 17 . The loudspeaker of claim 13 , wherein a fourth wall of the first frame includes a first plurality of mounting apertures, and the first frame is coupled to the permanent magnetic circuit via a plurality of fasteners that extend through the first plurality of mounting apertures.
18. 18 . The loudspeaker of claim 17 , wherein a fourth wall of the second frame includes a second plurality of mounting apertures, and the second frame is coupled to the permanent magnetic circuit via the plurality of fasteners that extend through the second plurality of mounting apertures.

Description

BACKGROUND The present invention relates to a basket for loudspeaker assemblies. A loudspeaker assembly is an electromechanical device that produces acoustic signals across a frequency range depending, at least in part, on the field strength of the permanent magnetic circuit used in the loudspeaker. It is generally accepted that the best way to increase the power handling of a loudspeaker is to increase the surface area of the voice coil, so it can radiate/dissipate more heat. This increase in voice coil surface area almost always increases the mass of the accompanying permanent magnetic circuit. Thus, a high power transducer necessitates a heavier magnetic structure than a low power transducer. The heavier magnetic structure increases the stress on the basket of loudspeaker assemblies. SUMMARY The present disclosure provides, in one aspect, a loudspeaker including a speaker basket. The speaker basket includes a first frame having an inner surface and an outer surface opposite the inner surface. The speaker basket further includes a second frame housed in the first frame. The second frame includes a first wall and a second wall. The first wall and the second wall of the second frame engage the inner surface of the first frame. The present disclosure provides, in one aspect, a speaker basket to house components of a loudspeaker. The speaker basket includes a first frame configured to be coupled to a permanent magnetic circuit at a proximal end of the first frame. The first frame includes an inner surface and an outer surface. The speaker basket further includes a second frame configured to engage the inner surface of the first frame. The present disclosure provides, in one aspect, a loudspeaker including a permanent magnetic circuit positioned at a proximal end of the loudspeaker and a first frame of a speaker basket coupled to the permanent magnetic circuit. The first frame includes a first wall that encircles a central axis defined by the loudspeaker, a second wall that encircles the central axis and defines an angle with the first wall, and a third wall that encircles the central axis and defines an angle with the second wall. The speaker basket further includes a second frame inside of the first frame. The second frame includes a first wall that encircles the central axis, a second wall that encircles the central axis and defines an angle with the first wall, and a third wall that encircles the central axis and defines an angle with the second wall. The first wall of the first frame engages the first wall of the second frame. The second wall of the first frame engages the second wall of the second frame. The third wall of the first frame engages the third wall of the second frame. Other features and aspects of the invention will become apparent by consideration of the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a loudspeaker. FIG. 2 is a cross-sectional view of the loudspeaker through section line 2-2 on FIG. 1. FIG. 3 is a detail view of a first frame and a second frame of a speaker basket of the loudspeaker as shown in FIG. 2. FIG. 4 is an enlarged view of the first frame and the second frame of FIG. 3 Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. DETAILED DESCRIPTION FIGS. 1-2 illustrate a loudspeaker 100 according to one embodiment of the present disclosure. The loudspeaker 100 provides an auditory output from an electrical input of an external device (e.g., microphone, cellular device, sound board, etc.). The loudspeaker 100 includes a permanent magnetic circuit 112, a spider 116, a cone 120, a surround 124, a dust cover 128, and a voice coil 140. The loudspeaker 100 defines a central axis A and extends from a proximal end 104 to a distal end 108. The permanent magnetic circuit 112 is magnetically coupled to the voice coil 140 to provide linear movement, along the central axis A, as directed by the electrical input into the voice coil 140. The dust cover 128 is positioned on the proximal end 104 of the cone 120 to protect a gap 144 and the voice coil 140 from unwanted debris. The spider 116 and the surround 124 act as a mechanical spring for the cone 120 as it moves during operation. The permanent magnetic circuit 112 and the voice coil 140 are configured to convert electrical input into a mechanical output, such that sound may be produced from the loudspeaker 100. The permanent magnetic circuit 112 is coupled to a speaker bask