JP2011101282A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker featuring that: thinning and miniaturization thereof are achieved; input durability characteristics and bass reproduction are excellent; and assemblability thereof is good. <P>SOLUTION: The speaker 1 includes: an elongated plate diaphragm 2; a frame 3; an edge 4; a magnetic circuit 5; a voice coil bobbin 6; a voice coil 7; and a support member 8. The support member 8 includes: first and second supporting beams 8a and 8b; and first-fourth bridge portions 8c-8f. There is no need to have the interval between the support member 8 and frame 3 and that of the support member 8 and diaphragm 2 widely secured since the support member 8 having the first and second support beams 8a and 8b serving as a damper is bonded to back surfaces of the frame 3 and diaphragm 2. This results in narrowing the interval between the frame 3 and diaphragm 2 so as to achieve the thinning of the speaker 1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an elongated speaker.

  Speakers are used not only for home audio devices and in-vehicle audio devices, but also for various electronic devices such as personal computers, mobile phones, and game machines. Electronic devices are becoming lighter, thinner, and smaller, and speakers are also required to be smaller, thinner, and higher performance.

  Since electronic devices have a limited installation space for speakers, restrictions on the dimensions of the speakers also increase, and a reduction in thickness is particularly required.

  As a conventional thin speaker, there is one provided with a structure in which a support member (damper) is joined to the outer periphery of a voice coil bobbin (see Patent Documents 1 and 2).

  As a measure for reducing the thickness, a structure in which a damper is omitted has been proposed. However, in this structure, a rolling phenomenon is likely to occur, and a reproduction volume is limited. In addition, if the damper is omitted, the member that holds the vibration of the diaphragm becomes only the edge and stability is deteriorated.In particular, in the elongated speaker, the long side edge is longer than the short side edge, Without a damper, the rolling phenomenon is more likely to occur.

  17 is a cross-sectional view showing the structure of a conventional elongated speaker 20 provided with a damper 21. The left side of FIG. 17 shows the cross-sectional structure in the minor axis direction, and the right side shows the cross-sectional structure in the major axis direction. As shown in FIG. 17, even if a damper is provided, the elongated speaker has a short diameter dimension. Therefore, the damper diameter is limited by the width in the short diameter direction, resulting in poor low-frequency reproduction capability.

  18 is a diagram showing a speaker 20a disclosed in Patent Document 1. FIG. 18 (a) is a plan view, FIG. 18 (b) is a cross-sectional view taken along line AA in FIG. 18 (a), and FIG. ) Is a plan view of the damper 21a. The inner peripheral part of the damper 21 a of the speaker 20 a is joined to the outer peripheral part of the voice coil bobbin 22, and the outer peripheral part is joined to the frame 23. The damper 21a shown in FIG. 18 (c) includes first and second arm portions 24 and 25 that are symmetrically disposed along the long side direction of the elongated speaker, and two first arms that are disposed in parallel. And an outer peripheral fixing portion 26 for bridging 24.

  FIG. 19 is a perspective view showing the shape of the damper 21b of the speaker disclosed in Patent Document 2. As shown in FIG. This damper 21b also has an inner peripheral portion joined to the outer peripheral portion of the voice coil bobbin and an outer end portion joined to the frame. The damper 21b shown in FIG. 19 includes a total of four support beams 27 arranged symmetrically along the longitudinal direction of the elongated speaker, and a bridge portion 28 that bridges the two support beams arranged in parallel. ing.

  In both of Patent Documents 1 and 2 described above, the damper is not joined to the diaphragm, but a known technique in which the damper is joined to the diaphragm is also proposed (see Patent Document 3).

  FIG. 20 is a cross-sectional view of the speaker 20b disclosed in Patent Document 3. As shown in FIG. The inner peripheral portion of the damper 21 c of the speaker 20 b in FIG. 20 is bonded to the back surface of the diaphragm 29, and the outer peripheral portion is bonded to the frame 30.

JP 2006-229288 A

Japanese Utility Model Publication No. 60-142596 JP 63-120590 A

  In the speakers of Patent Documents 1 and 2, dampers 21a and 21b are disposed between the back surface of the diaphragm and the upper end of the magnetic circuit, and the inner peripheral portions of the dampers 21a and 21b are joined to the outer peripheral portion of the voice coil bobbin. Yes. For this reason, the dampers 21a and 21b must be disposed so as not to contact both the diaphragm and the magnetic circuit, and as a result, it is difficult to reduce the thickness.

  Moreover, although the inner peripheral part of the damper 21c of patent document 3 is joined to the diaphragm 29, the specific structure of the damper 21c is not disclosed in patent document 3, and the shape of the damper 21c is not disclosed. Seems to have no technical features. Patent Document 3 describes that the damper 21c is disposed between the diaphragm 29 and the frame 30 to reduce the thickness. However, the damper 21c may not be sufficiently thinned according to the shape of the damper 21c. is there. In Patent Document 3, since the shape of the damper 21c is not specifically described, it is doubtful whether the thickness can be actually reduced.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a speaker that can be reduced in thickness and size, has excellent input resistance and low sound reproduction capability, and has good assemblability. is there.

In order to solve the above problems, according to one aspect of the present invention, an elongated flat diaphragm,
A frame disposed from the outer peripheral side of the elongated flat diaphragm to the rear;
An inner edge is joined to the elongated flat diaphragm, and an outer edge is joined to the frame;
A magnetic circuit disposed behind the elongated flat diaphragm and joined to the frame;
A voice coil bobbin having a front end joined to the elongated flat diaphragm and a rear end disposed in the magnetic circuit;
A voice coil wound around the outer periphery of the voice coil bobbin and supported in a magnetic gap of the magnetic circuit;
A support member that is disposed between the elongated flat plate diaphragm and the frame so as to surround the voice coil bobbin, and is joined to the elongated flat plate diaphragm and the frame;
The support member is
A plurality of first support beams disposed on one side along the longitudinal direction of the elongated flat plate-like diaphragm with the voice coil bobbin interposed therebetween;
A plurality of second support beams arranged on the other side along the longitudinal direction of the elongated flat plate-like diaphragm with the voice coil bobbin interposed therebetween,
A first bridging portion that bridges each one end side of the plurality of first support beams and is joined to the frame along the short direction of the elongated flat diaphragm.
A second bridging portion that bridges each other end side of the plurality of first support beams along the short direction of the elongated flat plate diaphragm and is joined to the back surface of the elongated flat plate diaphragm;
A third bridging portion that bridges each one end side of the plurality of second support beams and is joined to the frame along the short direction of the elongated flat plate-like diaphragm;
A fourth bridging portion that bridges each other end side of the plurality of second support beams along the short direction of the elongated flat plate diaphragm and is joined to the back surface of the elongated flat plate diaphragm; The speaker characterized by this is provided.

  According to the present invention, it is possible to realize a speaker that can be reduced in thickness and size, has excellent input resistance, low-pitched sound reproduction capability, and good assembly.

1 is a perspective view of a speaker 1 according to an embodiment of the present invention. The disassembled perspective view of the speaker 1 of FIG. (A) is a top view of the speaker 1 of FIG. 1, (b) is the BB sectional drawing of (a). The perspective view of the supporting member which comprises a part of speaker 1 of FIG. The figure which shows the assembly procedure of the speaker 1 of FIG. 1 typically. The perspective view of the 1st modification of the supporting member 8. FIG. The perspective view of the 2nd modification of the supporting member 8. FIG. The perspective view of the speaker 1a using the supporting member 82 of FIG. (A) is a top view of the speaker 1a of FIG. The perspective view of the speaker 1b provided with the supporting member 8 of FIG. 4 and the supporting member 82 of FIG. (A) is a top view of the speaker 1b of FIG. 10, (b) is the BB sectional drawing of (a). The perspective view of the 3rd modification of the supporting member 8. FIG. The perspective view of the 4th modification of the supporting member 8. FIG. The perspective view of the 5th modification of the supporting member 8. FIG. The perspective view of the speaker 1c using the supporting member 85 of FIG. (A) is a top view of the speaker 1c of FIG. 15, (b) is the BB sectional drawing of (a). Sectional drawing which shows the structure of the conventional elongate speaker 20 provided with the damper 21. FIG. It is a figure which shows the speaker 20a disclosed by patent document 1, (a) is a top view, (b) is the sectional view on the AA line of (a), (c) is a top view of the damper 21a. The perspective view which shows the shape of the damper 21b of the speaker disclosed by patent document 2. FIG. Sectional drawing of the speaker 20b disclosed by patent document 3. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a speaker 1 according to an embodiment of the present invention. In FIG. 1, the diaphragm is transparently shown so that the internal structure can be seen. 2 is an exploded perspective view of the speaker 1 of FIG. 1, FIG. 3A is a plan view of the speaker 1 of FIG. 1, FIG. 3B is a cross-sectional view taken along the line BB of FIG. It is a perspective view of the supporting member which comprises a part of speaker 1 of FIG.

  The speaker 1 includes an elongated flat diaphragm 2, a frame 3, an edge 4, a magnetic circuit 5, a voice coil bobbin 6, a voice coil 7, and a support member 8.

  The frame 3 is arranged from the outer peripheral side to the rear side of the elongated flat plate-like diaphragm 2, and the magnetic circuit 5 is joined to the back side of the frame 3. The inner peripheral part of the edge 4 is joined to the elongated diaphragm 2, and the outer peripheral part of the edge 4 is joined to the frame 3. The front end of the voice coil bobbin 6 is joined to the elongated flat diaphragm 2, and the rear end of the voice coil bobbin 6 is disposed in the magnetic circuit 5. The voice coil 7 is wound around the outer periphery of the voice coil bobbin 6 and is supported in the magnetic gap 10 of the magnetic circuit 5.

  The support member 8 is disposed between the diaphragm 2 and the frame 3 so as to surround the voice coil bobbin 6 and is joined to the diaphragm 2 and the frame 3. The voice coil bobbin 6 is fitted and inserted in a substantially central portion of the support member 8. The bonding between the support member 8 and the diaphragm 2 and the bonding between the support member 8 and the frame 3 are performed using, for example, an adhesive.

  As shown in FIG. 4, the support member 8 includes a plurality of first support beams 8 a disposed on one side of the elongated flat plate-like diaphragm 2 with the voice coil bobbin 6 interposed therebetween, and an elongated flat plate. A plurality of second support beams 8b arranged on the other side with the voice coil bobbin 6 interposed therebetween along the longitudinal direction of the plate-like diaphragm 2, and a plurality of second support beams 8b along the short direction of the elongated plate-like diaphragm 2 A first bridging portion 8c that bridges each one end side of one support beam 8a and is joined to the frame 3, and each other end side of the plurality of first support beams 8a along the short direction of the elongated flat diaphragm 2 Are bridged and joined to the back surface of the elongated flat plate-like diaphragm 2 by bridging one end side of the plurality of second support beams 8b along the short direction of the elongated flat plate-like diaphragm 2. And a plurality of second supports along the short direction of the elongated flat plate-like diaphragm 2. Having a fourth cross portion 8f which is joined to the rear surface of the other end of the crosslinked elongated plate-shaped vibrating plate 2 of the beam 8b.

  In addition, the support member 8 is joined to the frame 3 by bridging one end of the second bridging portion 8 d and one end of the fourth bridging portion 8 f along the longitudinal direction of the elongated flat plate-like diaphragm 2. A sixth bridge that is joined to the frame 3 by bridging the bridging portion 8g and the other end of the second bridging portion 8d and the other end of the fourth bridging portion 8f along the longitudinal direction of the elongated flat diaphragm 2. Part 8h.

  The total two first support beams 8a and the total two second support beams 8b function as dampers. In the support member 8 of FIG. 4, the entire bottom surfaces of the first bridging portion 8c and the third bridging portion 8e are joined to the frame 3, and the second bridging portion 8d, the fourth bridging portion 8f, the fifth bridging portion 8g, and the sixth bridging portion. The entire upper surface of the portion 8 h is bonded to the back surface of the diaphragm 2.

  In addition, the support member 8 has a voice coil guide portion 8 i for guiding the voice coil bobbin 6. The voice coil guide portion 8 i has a diameter substantially equal to the outer diameter of the voice coil bobbin 6, and the support member 8 is guided by the voice coil guide portion 8 i and is inserted along the outer periphery of the voice coil bobbin 6. As shown in FIG. 4, the voice coil guide portion 8i is formed on the inner side of the second bridge portion 8d and the fourth bridge portion 8f.

  The fifth bridging portion 8g and the sixth bridging portion 8h are used as a guide member when the voice coil bobbin 6 is inserted together with the voice coil guide portion 8i. Accordingly, a part of the fifth bridging portion 8g and the sixth bridging portion 8h are processed into an R shape in accordance with the shape of the outer peripheral portion of the voice coil bobbin 6.

  At a total of two locations of the voice coil guide portion 8i, there are provided lead wire guide portions 8j for guiding the lead wire 11 of the voice coil 7 in a predetermined direction along the back surface of the elongated flat diaphragm 2. The lead wire guide portion 8j is formed by cutting out a part of the voice coil guide portion 8i.

  As described above, the support member 8 of the present embodiment has the first support beam 8 a and the second support beam 8 b acting as dampers, one end of which is joined to the frame 3, and the other end is joined to the diaphragm 2. ing. That is, it is assumed that the support member 8 is joined to the diaphragm 2 and the frame 3. Thereby, it is not necessary to secure an interval between the support member 8 and the frame 3 and an interval between the support member 8 and the diaphragm 2 more than necessary, and as a result, the speaker 1 can be thinned. Further, the support member 8 is integrally formed using resin or the like, so that the assembly is easy and the assemblability is improved.

  In addition, the support member 8 is provided with a total of four first support beams 8a and second support beams 8b arranged symmetrically with the voice coil bobbin 6 interposed therebetween, so that the vibration of the diaphragm 2 can be accurately maintained. Thus, the positional deviation of the voice coil 7 can be suppressed. Thereby, the bass reproduction capability can be improved.

  FIG. 5 is a diagram schematically showing an assembly procedure of the speaker 1 of FIG. Hereinafter, the assembly procedure of the speaker 1 will be described with reference to FIGS. First, the voice coil 7 is wound around the voice coil bobbin 6, and the tinsel wire 12 is soldered to the end of the voice coil lead wire 11. Next, the front end portion of the voice coil bobbin 6 is adhered and fixed to the back surface of the diaphragm 2 to which the edge 4 is attached (step S1).

  Next, the support member 8 is fitted into the voice coil bobbin 6 along the voice coil guide portion 8i of the support member 8 and joined to the back surface of the diaphragm 2 (step S2).

  Next, the voice coil lead wire 11 is drawn out along the lead wire guide portion 8j of the support member 8, and the tinsel wire 12 soldered to the end of the voice coil lead wire 11 is soldered to the terminal 13 attached to the frame 3. Fix (step S3).

  Next, the assembly up to step S3 is bonded and fixed to the frame 3 using a jig. (Step S4). Prior to this step S4, the terminal 13 is attached to the frame 3.

  Next, the magnet 5b is bonded and fixed to the pot yoke 5a in the magnetic circuit 5 (step S5). Next, the pole piece 5c in the magnetic circuit 5 is bonded and fixed to the magnet 5b (step S6). In this step S6, the magnetic circuit 5 is completed.

  Next, the completed magnetic circuit 5 is fixed to the frame 3 (step S7).

  As described above, in this embodiment, the support member 8 having the first support beam 8a and the second support beam 8b acting as dampers is joined to the back surface of the frame 3 and the diaphragm 2. Therefore, it is not necessary to ensure a large distance between the support member 8 and the diaphragm 2. As a result, the distance between the frame 3 and the diaphragm 2 can be reduced, and the speaker 1 can be thinned.

  The support member 8 does not necessarily have a shape as shown in FIG. 4, and various modifications can be applied. FIG. 6 is a perspective view of a first modification of the support member 8. The support member 81 of FIG. 6 has a structure in which the voice coil guide portion 8i is deleted from FIG. As described with reference to FIG. 5, the support member 8 is attached after the voice coil bobbin 6 is joined to the back surface of the diaphragm 2, so that the support member 8 can be positioned without the need for the voice coil guide portion 8 i. It is. The support member 81 in FIG. 6 can be easily positioned because the inner peripheral surfaces of the fifth bridging portion 8g and the sixth bridging portion 8h are processed into an R shape in accordance with the outer peripheral shape of the voice coil bobbin 6. Accordingly, in the support member 81 of FIG. 6, the voice coil guide portion 8i is omitted.

  FIG. 7 is a perspective view of a second modification of the support member 8. The support member 82 of FIG. 7 has a structure further simplified than that of FIG. 6, and has a structure in which the fifth bridging portion 8g and the sixth bridging portion 8h are deleted from FIG. Thereby, the support member 82 is divided into two symmetrical members.

  FIG. 8 is a perspective view of the speaker 1a using the support member 82 of FIG. In FIG. 8, the diaphragm is transparently shown so that the internal structure can be seen. 9A is a plan view of the speaker 1a shown in FIG. 8, and FIG. 9B is a cross-sectional view taken along the line BB of FIG. 9A. Also in the speaker 1 a of FIG. 8, the support member 82 is joined to the frame 3 and the diaphragm 2. Therefore, the thickness can be reduced. Further, the support member 82 in FIG. 7 has a simpler structure than the support members 8 and 81 in FIG. 4 and FIG. 6, so that the assembly is easy and the assemblability is further improved. Further, since the vibration system mass is reduced by the mass of the fifth bridging portion 8g and the sixth bridging portion 8h and the amount of the adhesive, it contributes to the reproduction sound pressure.

  The support members 8 and 81 shown in FIGS. 4 and 5 and the support member 82 shown in FIG. 7 may be used in combination. 10 is a perspective view of a speaker 1b provided with the support member 8 of FIG. 4 and the support member 82 of FIG. In FIG. 10, the diaphragm is transparently shown so that the internal structure can be seen. 11A is a plan view of the speaker 1b shown in FIG. 10, and FIG. 11B is a cross-sectional view taken along line BB of FIG. 11A. The speaker 1b in FIG. 10 is longer in the longer diameter direction than the speaker 1 in FIG. 1, and four support beams and four bridge portions are arranged on each side in the long side direction with the voice coil bobbin 6 interposed therebetween. ing. By increasing the number of support beams and the number of bridge portions, the present invention can be applied to a speaker having a long major axis direction.

  FIG. 12 is a perspective view of a third modification of the support member 8. The support member 83 in FIG. 12 has a structure in which the second bridge portion 8d and the fourth bridge portion 8f are deleted from the support member 8 in FIG. Thereby, the support member 83 and the diaphragm 2 are joined only at the other end of the first support beam 8a and the other end of the second support beam 8b.

  As described above, the support member 83 in FIG. 12 has a simplified structure as compared with the support member 82 in FIG. 7, but since it is joined to both the frame 3 and the diaphragm 2, the speaker can be made thinner.

  FIG. 13 is a perspective view of a fourth modification of the support member 8. The support member 84 in FIG. 13 has a structure in which the first bridging portion 8c and the third bridging portion 8e are deleted from the support member 83 in FIG. Thereby, the support member 84 and the frame 3 are joined only at one end of the first support beam 8a and one end of the second support beam 8b.

  As described above, the support member 84 in FIG. 13 has a simplified structure than the support member 83 in FIG. 12. However, since the support member 84 is joined to both the frame 3 and the diaphragm 2, the speaker can be made thinner. .

  The support members 83 and 84 of FIG. 12 or FIG. 13 can be used together with the support members 8 and 81 of FIG. 4 or FIG. 6 in the same manner as the support member 82 of FIG. Thereby, like the speaker of FIG. 10, it becomes applicable to a speaker with a longer long side.

  FIG. 14 is a perspective view of a fifth modification of the support member 8. In addition to the structure of the support member 8 of FIG. 4, the support member 85 of FIG. 14 includes two third support beams 8k connected to the outside in the long side direction of the two first support beams 8a, Two fourth support beams 8m connected to the outside in the long side direction of the second support beam 8b, a seventh bridge portion 8n that bridges the two third support beams 8k, and the two fourth support beams 8m. And an eighth cross-linking portion 8p that cross-links.

  The first bridging portion 8c and the third bridging portion 8e are joined to the frame 3, and the second bridging portion 8d, the fourth bridging portion 8f, the seventh bridging portion 8n, and the eighth bridging portion 8p are joined to the back surface of the diaphragm 2. The As described above, since the support member 85 of FIG. 14 is also joined to the frame 3 and the diaphragm 2, the thickness can be reduced.

  FIG. 15 is a perspective view of a speaker 1c using the support member 85 of FIG. In FIG. 15, the diaphragm is transparently shown so that the internal structure can be seen. 16A is a plan view of the speaker 1c of FIG. 15, and FIG. 16B is a cross-sectional view taken along the line BB of FIG. 16A. As can be seen from these drawings, the support member 85 of FIG. 14 can be applied to a speaker having a longer long side direction.

  The support members 8, 81 to 85 shown in FIGS. 4, 6, 7, 12, 13, and 14 can be incorporated in the speaker in any combination according to the length in the long side direction of the speaker. Thus, application to various speakers becomes possible.

  Since any of the support members 8 and 81 to 85 described above are joined to the frame 3 and the diaphragm 2, a large distance is ensured in advance between the support member 8 and the frame 3, and between the support member 8 and the diaphragm 2. Therefore, the speaker can be thinned.

  In addition, since any of the support members 8 and 81 to 85 has a plurality of support beams 8a and 8b arranged symmetrically along the longitudinal direction, the vibration of the diaphragm 2 can be accurately maintained and the bass reproduction capability can be improved. .

  In the above-described embodiment, the example in which two support beams are provided on one side in the long side direction as the basic structure of the support member 8 has been described. However, if the number of support beams is two or more, the number is particularly large. There is no limit. The number and shape of the support beams and the bridging portions are not particularly limited as long as the structure includes a plurality of support beams and bridging portions that bridge these support beams, and the bridging portions are joined to the frame 3 or the diaphragm 2. .

  Based on the above description, those skilled in the art may be able to conceive additional effects and various modifications of the present invention. Accordingly, aspects of the present invention are not limited to the individual embodiments described above. Various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c Speaker 2 Elongated flat diaphragm 3 Frame 4 Edge 5 Magnetic circuit 6 Voice coil bobbin 7 Voice coil 8, 81-85 Support member 8a 1st support beam 8b 2nd support beam 8c 1st bridge | crosslinking part 8d Second bridging portion 8e Third bridging portion 8f Fourth bridging portion 8g Fifth bridging portion 8h Sixth bridging portion 8i Voice coil guide portion 8j Lead wire guide portion 8k Third support beam 8m Fourth support beam 8n Seventh bridging portion 8p 8th bridging section 10 Magnetic gap 11 Lead wire 12 Kinshi wire 13 Terminal

Claims (6)

An elongated flat diaphragm,
A frame disposed from the outer peripheral side of the elongated flat diaphragm to the rear;
An inner edge is joined to the elongated flat diaphragm, and an outer edge is joined to the frame;
A magnetic circuit disposed behind the elongated flat diaphragm and joined to the frame;
A voice coil bobbin having a front end joined to the elongated flat diaphragm and a rear end disposed in the magnetic circuit;
A voice coil wound around the outer periphery of the voice coil bobbin and supported in a magnetic gap of the magnetic circuit;
A support member that is disposed between the elongated flat plate diaphragm and the frame so as to surround the voice coil bobbin, and is joined to the elongated flat plate diaphragm and the frame;
The support member is
A plurality of first support beams disposed on one side along the longitudinal direction of the elongated flat plate-like diaphragm with the voice coil bobbin interposed therebetween;
A plurality of second support beams arranged on the other side along the longitudinal direction of the elongated flat plate-like diaphragm with the voice coil bobbin interposed therebetween,
A first bridging portion that bridges each one end side of the plurality of first support beams and is joined to the frame along the short direction of the elongated flat diaphragm.
A second bridging portion that bridges each other end side of the plurality of first support beams along the short direction of the elongated flat plate diaphragm and is joined to the back surface of the elongated flat plate diaphragm;
A third bridging portion that bridges each one end side of the plurality of second support beams and is joined to the frame along the short direction of the elongated flat plate-like diaphragm;
A fourth bridging portion that bridges each other end side of the plurality of second support beams along the short direction of the elongated flat plate diaphragm and is joined to the back surface of the elongated flat plate diaphragm; A speaker characterized by that.   The speaker according to claim 1, wherein the plurality of first support beams and the plurality of second support beams are arranged symmetrically with the voice coil bobbin interposed therebetween. A fifth bridge is formed by bridging one end of the second bridging portion and one end of the fourth bridging portion along the longitudinal direction of the elongated flat diaphragm and joining to the back surface of the elongated flat diaphragm. And
Along the longitudinal direction of the elongated flat diaphragm, the other end of the second bridging part and the other end of the fourth bridging part are bridged and joined to the back surface of the elongated flat diaphragm. The speaker according to claim 1, wherein the speaker has six cross-linking portions.   A voice coil guide portion is further provided along the short side direction of the elongated flat plate-like diaphragm, in the inner direction of the second and fourth bridging portions, and along the outer periphery of the voice coil bobbin. The speaker according to any one of claims 1 to 3.   The speaker according to claim 4, wherein the voice coil guide portion includes a lead wire guide portion for guiding a lead wire of the voice coil. A plurality of third support beams connected to the outside in the longitudinal direction with respect to each of the plurality of first support beams;
A plurality of fourth support beams connected to the outside in the longitudinal direction with respect to each of the plurality of second support beams;
A seventh bridging portion that bridges one end of each of the plurality of third support beams along the short direction of the elongated flat diaphragm and is joined to the back surface of the elongated flat diaphragm;
An eighth bridging portion that bridges one end side of the plurality of fourth support beams along the short direction of the elongated flat plate diaphragm and is joined to the back surface of the elongated flat plate diaphragm; The speaker according to any one of claims 1 to 5, wherein

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