CN211509289U

CN211509289U - Loudspeaker diaphragm and loudspeaker

Info

Publication number: CN211509289U
Application number: CN202020150759.9U
Authority: CN
Inventors: 温泓; 曾纪辉; 王亚弟; 牛源蓁
Original assignee: Harman International Industries Inc
Current assignee: Harman International Industries Ltd; Harman International Industries Inc
Priority date: 2020-02-03
Filing date: 2020-02-03
Publication date: 2020-09-15
Anticipated expiration: 2030-02-03

Abstract

Disclosed is a loudspeaker diaphragm including: the folded ring piece is provided with a flexible folded ring part at the peripheral position of the loudspeaker diaphragm; the flexible printed circuit board is connected to the folded ring part and comprises a first access part and a second access part which are arranged on the radial outer side of the folded ring part and used for receiving electric signals, and a first connection part and a second connection part which are arranged on the radial inner side of the folded ring part and used for being connected with a lead of a voice coil, wherein the first access part and the second access part are respectively and electrically connected with the first connection part and the second connection part through circuits in the flexible printed circuit board.

Description

Loudspeaker diaphragm and loudspeaker

Technical Field

The present invention relates to a loudspeaker diaphragm and a loudspeaker having the same, and more particularly, to a conductive loudspeaker diaphragm having a flexible printed circuit board and a loudspeaker having the same.

Background

The voice coil of the common micro-speaker is mostly of frameless design. The frameless voice coil is formed by winding a wire from inside to outside, wherein two lead wires of the voice coil are two ends of the wire. The position of being qualified for the next round of competitions of lead wire usually need leave crooked radian near for reserve vibration displacement, avoid dragging the voice coil loudspeaker voice coil when the speaker vibrating diaphragm vibrates from top to bottom, cause the polarization. In addition, it is usually necessary to inject white glue (a non-setting, viscous liquid) around the curvature to reduce the wind noise caused by the vibration and to reduce the amplitude of the up and down vibration at the curvature. In addition, unless the earphone loudspeaker is low in power, the lead wires of the other frameless voice coils need to be provided with a section of fixed part, and noise, abnormal sound and even touch caused by overlarge reserved radian are avoided. The fixation part is usually fixed with some soft glue (requiring a small amount of extensibility).

The above process has the following disadvantages: because the wire diameter of the voice coil lead is small (usually only 0.03-0.14mm), when the amplitude of the voice coil is too large, the wire outlet position of the voice coil lead is easy to break; the bending radian of the lead is very important, if the radian is not properly set, the position can be touched with other hard parts in the loudspeaker, noise is caused if the radian is light, and a single loudspeaker body is burnt out due to short circuit if the radian is heavy; the assembly process needs glue injection for many times (the voice coil-vibrating diaphragm needs glue coating and fixing, and the white oil glue is coated at the bending radian and the soft glue is coated at the fixed part), and the assembly process is complex; because the rigidity of the middle part of the vibrating diaphragm needs to be ensured, a vibrating diaphragm interlayer must be arranged.

Therefore, there is a need for a loudspeaker diaphragm and a loudspeaker that overcome the above-mentioned disadvantages.

SUMMERY OF THE UTILITY MODEL

According to the utility model discloses an aspect provides a loudspeaker diaphragm, include:

the folded ring piece is provided with a flexible folded ring part at the peripheral position of the loudspeaker diaphragm;

the flexible printed circuit board is connected to the folded ring part and comprises a first access part and a second access part which are arranged on the radial outer side of the folded ring part and used for receiving electric signals, and a first connection part and a second connection part which are arranged on the radial inner side of the folded ring part and used for being connected with a lead of a voice coil, wherein the first access part and the second access part are respectively and electrically connected with the first connection part and the second connection part through circuits in the flexible printed circuit board.

Alternatively, the flexible printed circuit board includes an inner ring radially inside the flexible loop portion, an outer ring radially outside the flexible loop portion, and a plurality of ribs extending between the inner ring and the outer ring, the first and second incoming portions being provided on the outer ring, and the first and second outgoing portions being provided on the inner ring.

Optionally, each rib extends a length in the circumferential direction that is greater than a length in the radial direction.

Optionally, each rib extends 2-5 or more times the length in the circumferential direction than in the radial direction.

Optionally, the flexible printed circuit board comprises a top layer, a bottom layer and a metal layer between the top layer and the bottom layer.

Optionally, the flexible printed circuit board further includes an inner plate portion radially inward of the inner ring.

Optionally, the loudspeaker diaphragm further includes an upper diaphragm forming at least a portion of an upper surface of the loudspeaker diaphragm and/or a lower diaphragm forming at least a portion of a lower surface of the loudspeaker diaphragm.

Optionally, the first and second breakout portions are each pads.

Optionally, an opening is formed in the lower film to expose the pad.

Optionally, an interlayer diaphragm is arranged between the upper diaphragm and the ring-folded part, or an interlayer diaphragm is arranged between the ring-folded part and the flexible printed circuit board.

Optionally, the flexible printed circuit board is disposed between the lower membrane and the ring-folded member.

Optionally, the hinge member is disposed between the lower membrane and the flexible printed circuit board.

Optionally, the flexible printed circuit board is at least partially formed inside the folded ring member in an encapsulated manner.

Optionally, the loudspeaker diaphragm is circular, racetrack, elliptical or rectangular.

Optionally, the loudspeaker diaphragm is flat or dome-shaped radially inward of the flexible hinge portion.

Optionally, the flexible hinge portion has an arcuate cross-section.

Optionally, the flexible loop portion is formed with a plurality of ribs.

Optionally, the flexible hinge is annular.

According to another aspect of the present invention, there is provided a speaker, including:

a magnetic circuit structure, wherein the magnetic circuit structure forms a magnetic gap;

a voice coil, a portion of the voice coil suspended in the magnetic gap;

according to the above loudspeaker diaphragm, the voice coil is connected to the loudspeaker diaphragm, and two leads of the voice coil are electrically connected to the first and second lead-out portions, respectively.

Optionally, the voice coil is bonded to the speaker diaphragm, and two leads of the voice coil are respectively welded to the first and second lead-out portions.

Drawings

Fig. 1 shows a loudspeaker according to an embodiment of the invention;

fig. 2A and 2B illustrate a diaphragm 100 according to a preferred embodiment of the present invention, wherein fig. 2A is a perspective view of the diaphragm 100, and fig. 2B is an exploded view of the diaphragm 100;

fig. 3A is a top view of a flexible printed circuit board of the diaphragm of fig. 2A-2B, and fig. 3B is a cross-sectional view of the flexible printed circuit board;

fig. 4A is a view showing an assembled relationship of the diaphragm and the voice coil of fig. 2A-2B, fig. 4B is a view showing the assembled relationship viewed from another angle, in which a circled portion is a partially enlarged view, and fig. 4C is an exploded view showing the assembly of the diaphragm and the voice coil;

fig. 5A and 5B are exploded views illustrating a diaphragm according to an alternative embodiment of the present invention;

fig. 6A and 6B show a diaphragm structure according to an alternative embodiment of the present invention, where fig. 6A is an exploded view and fig. 6B is a cross-sectional view;

figures 7A-7C illustrate an alternative embodiment of a clasp piece according to the present invention;

fig. 8A, 8B and 8C show the structure of a diaphragm according to an alternative embodiment of the present invention;

FIG. 9 shows an alternative embodiment in which a flexible printed circuit board is overmolded within a corrugated member;

fig. 10A and 10B illustrate a mechanism of a flexible printed circuit board according to an alternative embodiment of the present invention;

fig. 11A to 11E show a diaphragm according to an alternative embodiment of the present invention, in which fig. 11A is a top view, fig. 11B is a side view, fig. 11C is a bottom view, fig. 11D is an exploded cross-sectional view, and fig. 11E is an exploded view;

fig. 12A and 12B show a diaphragm according to an alternative embodiment of the present invention, in which fig. 12A is an exploded sectional view and fig. 12B is an exploded view;

figures 13A-13C illustrate diaphragm shapes according to alternative embodiments of the present invention;

figure 14 shows a flap member according to an alternative embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. As used herein, "radial" is with respect to the axis of the speaker. "radially inner" and "radially outer" refer to inner and outer sides in a radial direction with respect to the axis of the speaker.

Fig. 1 shows a loudspeaker 10 according to an embodiment of the invention. The speaker 10 includes a magnetic circuit system, a diaphragm 50, a voice coil 30, and a support 40. The magnetic circuit system comprises a magnet 20 and magnetically

permeable members

22, 24, wherein the magnet 20 and the magnetically

permeable members

22, 24 are arranged to form a magnetic gap. The voice coil 30 has an upper end connected to the diaphragm 50 and a lower end disposed in the magnetic gap. The bracket 40 is fixedly connected to the magnetic conductive member 24, and the outer edge of the diaphragm 50 is connected to the bracket 40.

Fig. 2A and 2B show a diaphragm 100 according to a preferred embodiment of the present invention, wherein fig. 2A is a perspective view of the diaphragm 100, and fig. 2B is an exploded view of the diaphragm 100. As shown in fig. 2B, the diaphragm 100 includes an upper diaphragm 110, a corrugated rim 130, a Flexible Printed Circuit Board (FPCB)140, and a lower diaphragm 120, which are connected (e.g., bonded) together. As shown, the grommet device 130 includes a flexible grommet portion 132 at the outer periphery and an inner portion 134 radially inward of the flexible grommet portion 132. As best shown in fig. 4C, the flexible hinge portion 132 has an arcuate cross-section and the inner portion 134 has a flat plate shape. The upper diaphragm 110 and the lower diaphragm 120 may be made of the same material or two different materials, and the common materials are aluminum foil, wood chips, paper sheets, carbon fiber plates, and the like, which are used for reinforcing the rigidity of the middle portion of the diaphragm and protecting the diaphragm.

A flexible printed circuit board 140 is attached (e.g., glued) to the underside of the hinge member 130. As best shown in fig. 3A, the flexible printed circuit board 140 includes an inner ring 160, an outer ring 150, a plurality of elongated ribs 170 extending between the inner ring 160 and the outer ring 150, and an inner plate portion 180 inside the inner ring 160. As best shown in fig. 3A, each rib 170 extends first in a generally radial direction from outer ring 150 inwardly to a location generally midway between the inner and outer rings, then extends in a circumferential direction (in a direction around inner ring 160), and finally extends in a generally radial direction to inner ring 160. Each rib 170 extends a length in the circumferential direction (in a direction around the inner ring 160) that is significantly greater than the length in the radial direction. Preferably, each rib extends in the circumferential direction over a length of 2-5 or more times the length in the radial direction. In fig. 3A, 10A, and 10B, the blank regions are hatched. The flexible printed circuit board 140 further includes a first access terminal 152 and a second access terminal 154 disposed on the outer ring 150 and extending outwardly from the outer ring 150. As shown in fig. 4B, the flexible printed circuit board 140 further includes a first lead-out portion 162a and a second lead-out portion 162B provided on the inner ring 160 and extending downward from the inner ring. In this embodiment, the first and second lead-

outs

162a and 162b are in the form of pads and extend downwardly from two corresponding recesses of the lower diaphragm 120 beyond the lower diaphragm 120 (as shown in fig. 4C). When the voice coil 30 is attached to the diaphragm 100, the voice coil body 34 is bonded to the lower surface of the diaphragm 100 (preferably, to a position where the lower surface of the diaphragm 100 corresponds to the inner ring 160) by the adhesive 128, and two voice coil leads (only one voice coil lead 32B is shown in fig. 4B and 4C) of the voice coil 30 are soldered to the first lead-out portion 162a and the second lead-out portion 162B, respectively. The first and

second access terminals

152 and 154 are electrically connected to the first and second lead-out

portions

162a and 162b, respectively, via wires in the flexible printed circuit board. When the audio electric signal is connected to the first and second

incoming terminals

152 and 154, the audio electric signal is transmitted into the voice coil through the wiring within the flexible printed circuit board, the first and

second taps

162a and 162b, and the two voice coil leads of the voice coil 30. After the audio electric signal is transmitted to the voice coil 30, the voice coil 30 may vibrate in the axial direction of the speaker in the magnetic gap, so that the vibration of the voice coil 30 drives the diaphragm 100 to vibrate.

As shown, the inner ring 160 is attached (e.g., bonded) to the underside of the ring-fold member 130 at a location radially inward of the flexible ring-fold portion 132. When the voice coil 30 drives the diaphragm 100 to vibrate, the radially inner region (including the inner ring 160 and the first and

second connection portions

162a and 162b) of the flexible loop portion 132 of the diaphragm 100 vibrates along with the voice coil 30. Therefore, the voice coil 30, the voice coil lead, the inner ring 160 of the flexible printed circuit board 140, and the first and second lead-out

portions

162a and 162b all vibrate together. Since these components vibrate together, the connection between the voice coil 30 and the flexible printed circuit board is simple and firm, and the technical problems described in the background of the present invention do not exist.

The outer ring 150 is attached (e.g., bonded) to the underside of the ring-fold member 130 at a location radially outward of the flexible ring-fold portion 132. The outer ring 150 is fixed to the fixed structure of the speaker together with the outer edge of the flexure 130 (radially outward of the flexible flexure 130). Therefore, when the voice coil 30 vibrates the diaphragm 100, the outer ring 150 and the first and

second access terminals

152 and 154 are fixed. Accordingly, the connection between the first and

second access terminals

152 and 154 of the flexible printed circuit board 140 and the external audio line is simple and firm without the problems of the prior art described in the background section of the present disclosure.

As described above, each rib portion 170 extends in the circumferential direction (direction around the inner plate portion 180) over a length significantly greater than that in the radial direction. Preferably, each rib extends in the circumferential direction over a distance of 2-5 or even more times the length in the radial direction. This arrangement enables the rib portion 170 to give good support to the inner ring 160 while having good flexibility, which, together with the flexure hinge portion 132, allows the radially inner region of the flexure hinge portion 132 of the diaphragm 100 to vibrate with the voice coil 30.

The utility model discloses a vibrating diaphragm has following technical advantage: the power and amplitude which can be borne are large; the flexible printed circuit board can play a centering role under large amplitude, and the polarization phenomenon is reduced; the assembly process of each part of the loudspeaker is simple; the risk caused by the bending radian of the lead of the voice coil does not need to be considered; the rigidity of the middle part of the vibrating diaphragm can be enhanced; because the outer edge (the welt part) of the diaphragm is cushioned by the flexible printed circuit board, the vibration displacement of the thickness of the flexible printed circuit board does not need to be reserved because of using the flexible printed circuit board. The utility model discloses a vibrating diaphragm is particularly useful for miniature and/or ultra-thin speaker.

Fig. 3B is a sectional view showing the flexible printed circuit board 140. As shown, the flexible printed circuit board 140 includes a top layer 142, a bottom layer 146, and a metal layer (e.g., a copper metallization layer) 144 between the top layer 142 and the bottom layer 146. The top layer 142 and the bottom layer 146 function to protect the metal layers in the middle. Typically, the top layer 142 and the bottom layer 146 have a thickness substantially equal to the thickness of the metal layer (between 0.025 mm and 0.2mm single layer), and may be PI (kapton). The metal layer of the flexible printed circuit board 140 can conduct electricity. A bottom layer 146 of the flexible printed circuit board 140 is formed with holes to expose portions of the copper and is covered with a layer of tin over the exposed copper to form tin pads 148 for connection to the leads of the voice coil. Although the preferred embodiment of the present invention shows the sectional structure of the flexible printed circuit board, the present invention is not limited thereto, and the flexible printed circuit board of the present invention may have other sectional structures, for example, more or less than three-layer structures.

As described above, the diaphragm 100 according to the preferred embodiment of the present invention includes the upper diaphragm, the loop member, the flexible printed circuit board, and the lower diaphragm connected together. However, the present invention is not limited thereto, and the vibrating diaphragm of the present invention may have other structures. For example, fig. 5A and 5B show the structure of

diaphragms

200, 300 according to alternative embodiments of the present invention. As shown, the diaphragm 200 also includes an upper diaphragm 210, a corrugated member 230, a flexible printed circuit board 240, and a lower diaphragm 220. In addition, the diaphragm 200 includes an interlayer diaphragm 260 disposed between the upper diaphragm 210 and the edge ring 230. Diaphragm 300 also includes an upper diaphragm 310, a corrugated member 330, a flexible printed circuit board 340, and a lower diaphragm 320. In addition, the diaphragm 300 further includes a sandwich membrane 360 disposed between the ring-folded member 330 and the flexible printed circuit board 340. The

diaphragms

200, 300 are similar to the diaphragm 100, except for the sandwiched

diaphragms

260 and 360, and are not described in detail herein.

As described above, the diaphragm 100 according to the preferred embodiment of the present invention includes the upper diaphragm, the loop member, the flexible printed circuit board, and the lower diaphragm which are connected together from the top down. However, the present invention is not limited thereto, and the vibrating diaphragm of the present invention may have other structures. Fig. 6A and 6B show the structure of a diaphragm 400 according to an alternative embodiment of the present invention. As shown, the diaphragm 400 includes an upper diaphragm 410, a flexible printed circuit board 440, a corrugated member 430, and a lower diaphragm 420 connected together from top to bottom. In this embodiment, the pad 262 is exposed through the hinge member 430 and the lower diaphragm 420 so as to be connected to the lead of the voice coil.

Fig. 7A-7C show

alternative embodiments

130a, 130b, 130C of the flap member according to the invention. As shown, the radially inner side of the flexible loop portion of the loop member 130a is blank (the hatched line in fig. 7A indicates blank), the radially inner side of the flexible loop portion of the loop member 130b is a flat plate portion having a plurality of perforations, and the radially inner side of the flexible loop portion of the loop member 130c is a flat plate portion without any perforations. The plurality of through holes of the flat plate portion of the ring-folded member 130b can play a role of glue storage, so as to facilitate the adhesion with the front film and the flexible printed circuit board.

As described above, the diaphragm 100 according to the preferred embodiment of the present invention includes the upper diaphragm, the loop member, the flexible printed circuit board, and the lower diaphragm connected together. However, the present invention is not limited thereto, and in the case where the rigidity of the central portion of the diaphragm is sufficient, the front and rear diaphragms may be provided only with one or neither. Fig. 8A, 8B and 8C show the structure of a

diaphragm

500, 500', 600 according to an alternative embodiment of the present invention. As shown, the diaphragm 500 includes an upper diaphragm 510, a corrugated member 530, and a flexible printed circuit board 540, but does not include a lower diaphragm. The diaphragm 500 'includes a loop-back member 530', a flexible printed circuit board 540 ', and a lower diaphragm 520', but does not include an upper diaphragm. The diaphragm 600 includes the loop piece 630 and the flexible printed circuit board 640, and does not include the upper diaphragm and the lower diaphragm.

In the diaphragm 100 according to the preferred embodiment of the present invention, the flexible printed circuit board and the corrugated rim member are separately formed separate members. However, the present invention is not limited thereto, and in an alternative embodiment of the present invention, the flexible printed circuit board and the edge member may be overmolded together. For example, in the embodiment shown in fig. 9, a flexible printed circuit board 640 is overmolded within the corrugated member 630 except for the flexible corrugated portion area. In this embodiment, the edge piece 640 is made of a material suitable for over-molding, such as rubber.

In the diaphragm 100 according to the preferred embodiment of the present invention, inside the inner ring 160 of the flexible printed circuit board is the inner plate portion 180 without any holes or blank areas. However, the present invention is not limited thereto, and the inner plate portion of the present invention may have some blank areas or holes. In the flexible printed circuit board 140A shown in fig. 10A, the inner plate portion includes a single elongated substantially rectangular hole in the center. In the flexible printed circuit board 140B shown in fig. 10B, a plurality of slits are included in the inner plate portion. In fig. 10A and 10B, the blank regions are hatched.

In the diaphragm 100 according to the preferred embodiment of the present invention, the central region of the diaphragm is flat. However, the present invention is not limited thereto, and the vibrating diaphragm of the present invention may have other shapes. For example, fig. 11A-11E illustrate a diaphragm 700 having a dome-shaped central region, where fig. 11A is a top view, fig. 11B is a side view, fig. 11C is a bottom view, fig. 11D is an exploded cross-sectional view, and fig. 11E is an exploded view. As shown in fig. 11D and 11E, the diaphragm 700 includes an upper diaphragm 710, a corrugated member 730, and a flexible printed circuit board 740.

Fig. 12A and 12B show a diaphragm 800 according to another embodiment, where the diaphragm 800 includes a ring-folded member 830 and a flexible printed circuit board 840. In this embodiment, the diaphragm 800 does not include an upper diaphragm, and a central region of the flexible printed circuit board 840 thereof serves as a vibration area.

The above embodiments show a diaphragm structure of a specific shape. However, the utility model is not limited to this, the utility model discloses a vibrating diaphragm can possess any suitable shape. For example, fig. 13A shows a circular shaped diaphragm 900, fig. 13B shows a racetrack shaped diaphragm 1000, and fig. 13C shows an elliptical shaped diaphragm 1100.

Fig. 14 shows a grommet 1230 according to an alternative embodiment of the present invention, wherein the grommet 1230 is provided with a plurality of reinforcing ribs 1232 in its flexible grommet part in the circumferential direction.

The above description is only for the purpose of illustrating exemplary embodiments of the principles of the present invention, and is not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also within the scope of the invention.

Claims

1. A loudspeaker diaphragm, comprising:

2. The loudspeaker diaphragm of claim 1, where the flexible printed circuit board includes an inner ring radially inward of the flexible hinge portion, an outer ring radially outward of the flexible hinge portion, and a plurality of ribs extending between the inner ring and the outer ring, the first and second access portions being disposed on the outer ring, and the first and second access portions being disposed on the inner ring.

3. The loudspeaker diaphragm of claim 2 where each rib portion extends a length in the circumferential direction that is greater than a length in the radial direction.

4. The loudspeaker diaphragm of claim 2 where each rib portion extends 2-5 or more times the length in the circumferential direction than in the radial direction.

5. The loudspeaker diaphragm of claim 1 where the flexible printed circuit board includes a top layer, a bottom layer, and a metal layer between the top layer and the bottom layer.

6. The loudspeaker diaphragm of claim 2 where the flexible printed circuit board further includes an inner plate portion radially inward of the inner ring.

7. The loudspeaker diaphragm of claim 1 further comprising an upper diaphragm forming at least a portion of an upper surface of the loudspeaker diaphragm and/or a lower diaphragm forming at least a portion of a lower surface of the loudspeaker diaphragm.

8. The loudspeaker diaphragm of claim 7 where the first and second breakout portions are each a pad.

9. The loudspeaker diaphragm of claim 8 where an opening is formed in the lower diaphragm to expose the bonding pad.

10. The loudspeaker diaphragm of claim 7 where an interlayer diaphragm is disposed between the upper diaphragm and the ring-folded member, or between the ring-folded member and the flexible printed circuit board.

11. The loudspeaker diaphragm of claim 9 where the flexible printed circuit board is disposed between the lower diaphragm and the loop member.

12. The loudspeaker diaphragm of claim 9 where the loop member is disposed between the lower diaphragm and the flexible printed circuit board.

13. The loudspeaker diaphragm of claim 1 where the flexible printed circuit board is at least partially formed in an encapsulated manner within the loop member.

14. The loudspeaker diaphragm of claim 1 where the loudspeaker diaphragm is circular, racetrack, oval, or rectangular.

15. The loudspeaker diaphragm of claim 1 where the loudspeaker diaphragm is flat or dome-shaped radially inward of the flexible baffle portion.

16. The loudspeaker diaphragm of claim 1 where the flexible flexure has an arcuate cross-section.

17. The loudspeaker diaphragm of claim 16 where the flexure loop portion is formed with a plurality of reinforcing ribs.

18. The loudspeaker diaphragm of claim 1 where the flexible corrugated portion is annular.

19. A loudspeaker, comprising:

a voice coil, a portion of the voice coil suspended in the magnetic gap;

the loudspeaker diaphragm of any one of claims 1-18 where the voice coil is connected to the loudspeaker diaphragm and two leads of the voice coil are electrically connected to the first and second tap portions, respectively.

20. The loudspeaker of claim 19, wherein the voice coil is bonded to the loudspeaker diaphragm, and two leads of the voice coil are soldered to the first and second tap portions, respectively.