JP2002271893A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker where jointing strength between a connection section and a damper can be enhanced. SOLUTION: The connection section 18 consists of a 1st cylinder 15, a 2nd cylinder 16 and a 1s torus 17; an inner circumferential part of the damper 28 is folded back upward to fix an inner circumferential face of an inner circumferential part of the diaphragm 27 to an outer circumferential face of the 2nd cylinder 16; the damper 28 is clamped by the diaphragm 27; and a reinforcement section at a lower end of the connection section 18 to enhance the joining strength thereby enhancing the reliability as the speaker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodynamic loudspeaker used as audio equipment.

[0002]

2. Description of the Related Art Along with the space saving of audio equipment and the like, there is an increasing demand for smaller, thinner and lighter speakers mounted thereon. To reduce the size and weight of the speaker, it is effective to reduce the size of the magnetic circuit. Until now, magnetic circuits using ferrite magnets have been the mainstream, but the energy product of ferrite magnets is small, so that the magnetic circuit becomes large and occupies most of the weight of the speaker. In recent years, Nd-Fe-B based magnets having a high energy product have become widespread,
With a magnetic circuit incorporating an Fe-B magnet, reduction in size and weight of a speaker is becoming realistic. However, even if the Nd-Fe-B-based magnet is used, a general speaker has almost the same height as a speaker using a ferrite magnet.

[0003] Such a conventional speaker will be described with reference to the sectional view of FIG. In FIG. 1, reference numeral 1 denotes a plate, 2 denotes a magnet magnetized in the vertical direction, and 3 denotes a yoke. The yoke 3 forms a magnetic circuit in which a magnetic gap is formed by the outer peripheral surface and the inner peripheral surface of the yoke 3. 4 is a coil, 5 is a bobbin, 6 is a voice coil composed of the coil 4 and the bobbin 5, 7 is a diaphragm, 8 is an edge of the diaphragm 7 having an inner peripheral portion fixed to the outer peripheral portion, and 9 is a bobbin 5 A damper 10 having an inner peripheral portion fixed to an intermediate portion of the outer peripheral surface, 10 is an outer peripheral portion of the edge 8 and an outer peripheral portion of the damper 9, and a frame 1 to which a magnetic circuit is fixed.
1 is a terminal fixed to the frame 10, 12 is a dust cap fixed to the upper end of the bobbin 5, and 13 is a lead wire for electrically connecting the coil 4 and the terminal 11.

A current flows through the coil 4 by an electric signal input from the terminal 11, and is transmitted to the diaphragm 7 via the bobbin 5 by a driving force generated in the coil 4 suspended in the magnetic field in the magnetic gap. Sound is radiated from the diaphragm 7.

In general, the lead wire 13 is drawn out from the coil 4 along the outer peripheral surface of the bobbin 5 and further drawn out along the upper surface side of the diaphragm 7 so that the lead wire 13 The wire is relayed to the wire, and the tinsel wire passes through the lower surface of the diaphragm 7 and is joined to the terminal 11. Here, the total height of the loudspeaker is approximately the same as the total height of the magnetic circuit, the distance from the upper end of the yoke 3 to the damper 9 arranged with an amplitude margin, and the height of the diaphragm 7 arranged above the damper 9. Will be added.

Next, a conventional thin speaker will be described with reference to a sectional view of FIG. The same parts as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted. According to FIG.
Is a connecting portion, the outer peripheral surface of the bobbin 5 and the inner peripheral surface of the connecting portion 14 are fixed, and the outer peripheral surface of the connecting portion 14 and the inner peripheral portion of the damper 9 and the inner peripheral portion of the diaphragm 7 are fixed. The driving force generated in the voice coil 6 is transmitted to the diaphragm 7 via the connecting portion 14.

[0007]

In the conventional thin loudspeaker shown in FIG. 9, there is a risk of damage due to insufficient strength of a fixing portion between the outer peripheral surface of the connecting portion 14 and the inner peripheral portion of the damper 9 when the loudspeaker is driven. Was something.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is directed to an inner first cylinder, an outer second cylinder and an outer second cylinder formed at least on concentric circles. A connecting portion having a first ring connecting the upper end of the first cylinder and the upper end of the second cylinder, a voice coil formed of at least a coil and a bobbin, and a magnetic circuit having a magnetic gap into which the voice coil is inserted A frame, an edge having an outer peripheral portion fixed to the frame, a diaphragm having an outer peripheral portion fixed to an inner peripheral portion of the edge, a first damper having an outer peripheral portion fixed to the frame, and a first cylinder. The inner peripheral surface of the bobbin is fixed to the outer peripheral surface of the bobbin, and the inner peripheral portion of the damper is folded upward to form an inner peripheral surface of the inner peripheral portion of the diaphragm, an outer peripheral surface of the second cylinder, and an upper end of the inner peripheral portion of the damper. And the lower end of the inner peripheral portion of the diaphragm. The upper surface of the reinforcing portion formed by folding the lower end of the cylinder in the outer diameter direction and the lower surface of the inner peripheral portion of the damper are fixed, and the damper is sandwiched between the diaphragm and the reinforcing portion which is the lower end of the connecting portion. With this structure, the bonding strength of the damper to the connecting portion can be sufficiently secured to provide an excellent thin speaker.

According to a second aspect of the present invention, in the first aspect, the upper end of the bobbin is located at least above the upper end of the first cylinder, and the dust cap is joined to the inner peripheral surface of the bobbin at the upper end. In the loudspeaker described above, the lead wire is formed of a tinsel wire and a metal foil, the metal foil is formed on a bobbin and joined to a coil, and the bobbin is connected between an upper end of the bobbin and an upper end of the first cylinder. The outer peripheral surface of the metal foil exposed on the outer peripheral surface is joined to one end of the tinsel wire, and the tinsel wire is penetrated through the diaphragm and the other end is connected to the terminal to facilitate wiring of the lead wire. In addition, the reliability of the loudspeaker is improved as a configuration that can secure the mechanical strength of the lead wire.

According to a third aspect of the present invention, at least an inner first cylinder, an outer second cylinder, an upper end of the first cylinder, and an upper end of the second cylinder formed on concentric circles. A coupling portion having a first ring to be coupled, a voice coil formed of at least a coil and a bobbin, a magnetic circuit having a magnetic gap into which the voice coil is inserted, a frame,
A loudspeaker comprising a diaphragm having an outer peripheral portion indirectly or directly coupled to a frame, and a first damper and a second damper each having an outer peripheral portion fixed to the frame.
The inner peripheral surface of the cylinder is fixed to the outer peripheral surface of the bobbin, the inner peripheral surface of the inner peripheral portion of the diaphragm is fixed to the outer peripheral surface of the second cylinder, and the inner peripheral portion of the first damper is folded upward. An upper surface of a reinforcing portion formed by bending a lower end of the second cylinder in an outer radial direction and a lower surface of an inner peripheral portion of the first damper; The inner peripheral portion is folded down to be fixed to the outer peripheral surface of the second cylinder, and not only can the two dampers have a vertically symmetric structure with respect to the amplitude direction, but also can be connected to the second damper at the time of assembling the speaker. The adhesive can be easily applied from above to the joint portion with the portion, and the folded end of the inner peripheral portion of the first damper and the folded end of the second damper can be fixed to each other. The joint area is secured on the inner periphery of the joint to secure the joint strength,
This enhances the reliability of the speaker.

According to a fourth aspect of the present invention, at least an inner first cylinder, an outer second cylinder, an upper end of the first cylinder, and an upper end of the second cylinder formed on concentric circles. A coupling portion having a first ring to be coupled, a voice coil formed of at least a coil and a bobbin, a magnetic circuit having a magnetic gap into which the voice coil is inserted, a frame,
A diaphragm having an outer peripheral portion indirectly or directly coupled to the frame, a first damper and a second damper each having an outer peripheral portion fixed to the frame, and a second cylinder having a second cylinder having two different diameters. The third cylinder, the fourth cylinder, the third cylinder, and the fourth cylinder
The third cylinder is located above the fourth cylinder, the fourth cylinder is set larger than the third cylinder, and the first cylinder is connected to the third cylinder. The inner peripheral surface of the cylinder is fixed to the outer peripheral surface of the bobbin, the inner peripheral surface of the inner peripheral portion of the diaphragm is fixed to the outer peripheral surface of the third cylinder, and the inner peripheral portion of the second damper is folded upward to form the second damper. 3 and the upper surface of the second ring and the lower surface of the inner periphery of the second damper are fixed, and the inner periphery of the first damper is folded upward to form the fourth cylinder. And the upper surface of the reinforcing portion formed by folding the lower end of the fourth cylinder in the outer diameter direction and the lower surface of the inner peripheral portion of the first damper are fixed to each other. The damper has a structure that can increase the joint area to the connecting part, thereby improving the reliability of the speaker. By having the outer peripheral portion and the stepped structure, it is possible to increase the radial mechanical strength of the connecting portion itself may be a large output loudspeaker.

[0012] The invention described in claim 5 of the present invention is also applicable to the speaker of claim 3 or 4. It has a structure in which a third ring, which is a weight-added material, is fixed to the upper surface of the first ring, and can be deployed on a subwoofer.

According to a sixth aspect of the present invention, there is provided a loudspeaker according to the fifth aspect, wherein an outer peripheral portion of the third ring is folded downward, and a lower surface of the third ring and the folded inner peripheral surface are formed. These are fixed to the upper surface of the first ring and the outer peripheral surface of the second cylinder or the outer peripheral surface of the third cylinder, respectively, and when expanding to the subwoofer, it is possible to suppress an increase in the overall height of the speaker due to a weight addition, The joint strength can be ensured by increasing the joint area between the connecting portion and the weight-added object.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a sectional view of Embodiment 1 of a loudspeaker according to the present invention, and mainly describes the loudspeaker according to the first aspect. According to the figure, 15 is the first cylinder, 16 is the second cylinder, 17 is the first cylinder.
And these constitute the connecting portion 18.
19 is a coil, 20 is a bobbin, and these constitute a voice coil 21. 22 is a magnet, 23 is a plate, 2
Reference numeral 4 denotes a yoke, which constitutes a magnetic circuit. 25
Is a frame, 26 is an edge, 27 is a diaphragm, 28 is a first
, 29 is a terminal, 30 is a lead wire, and 31 is a dust cap.

Next, the detailed configuration of the first embodiment will be described together with the operation.

In the magnetic circuit, the voice coil 21 is suspended in a magnetic gap formed by the outer peripheral surface of the plate 23 and the inner peripheral surface of the yoke 24, and the outer peripheral surface of the bobbin 20 and the first cylinder 1
5, the inner peripheral surface of the second cylinder 16 is fixed to the outer peripheral surface of the second cylinder 16.
The inner peripheral portion of the damper 28 and the inner peripheral portion of the diaphragm 27 are fixed. The outer peripheral portion of the diaphragm 27 and the inner peripheral portion of the edge 26 are fixed, and the outer peripheral portion of the edge 26 and the first damper 28 are fixed.
, The magnetic circuit and the terminal 29 are fixed to the frame 25. The dust cap 31 is fixed to the upper end of the bobbin 20. The lead wire 30 is connected to the bobbin 2 from both ends of the coil 19.
0 along the outer peripheral surface of the first cylinder 15, the outer peripheral surface of the second cylinder 16, and the upper surface of the diaphragm 27. And is joined to the terminal 29. Note that the lead wire 30 may be relayed to the tinsel wire on the diaphragm 27 and joined to the terminal 29.

Here, when an electric signal is input from the terminal 29 and a current flows through the coil 19 suspended in the magnetic gap, a driving force is generated in the coil 19 in accordance with the electric signal, and the bobbin 20 and the connecting portion 18 are connected. The driving force is transmitted to the diaphragm 27 via the diaphragm 27 to emit sound.

As can be seen from the first embodiment, the connecting portion 1
Since the weight of the vibration system 8 is also large, the lighter the weight is, the better the efficiency of the speaker is, that is, a larger reproduced sound is obtained with the same electric input. It is necessary to be thin to satisfy the light weight,
In order to be thin, it must have sufficient mechanical strength and sufficient heat resistance to withstand the heat generated by the voice coil 21, and therefore must be formed of metal or a high heat-resistant resin.

It is practical to fix the connecting portion 18 and the first damper 28 with an adhesive. However, in general, both of them have poor adhesion to the first damper 28, so that the joint portion is easily detached. To solve this problem, the lower end of the connecting portion 18
That is, the upper surface of the reinforcing portion formed by folding the lower end of the second cylinder 16 in the outer radial direction and the lower surface of the inner peripheral portion formed by folding the inner peripheral portion of the first damper 28 upward are fixed. The joint area is enlarged to improve the strength.

Further, the first damper 28 is
As a structure in which the first damper 28 is sandwiched between the connecting portion 18 and the reinforcing portion that is the lower end of the connecting portion 18, the joining strength of the first damper 28 to the connecting portion 18 is sufficient, and the reliability is improved. Also, the first damper 28
Is folded back upward, so that the speaker can be easily inserted into the connecting portion 18 from above during assembly.

(Embodiment 2) FIG. 2 (a) is a cross-sectional view of Embodiment 2 of the speaker of the present invention, and FIG. 2 (b) is a detailed view of a voice coil portion as a main part, mainly A second aspect will be described. The parts in the figure that are the same as those in the first embodiment will be described by assigning the same numbers. According to the figure, reference numeral 32 denotes a metal foil provided on the bobbin 20. The difference between the second embodiment and the first embodiment is that the upper end of the bobbin 20 extends above the upper end of the connecting portion 18, that is, the first cylinder 15, and is exposed above the connecting portion 18. The outer peripheral surface of the upper metal foil 32 is joined to the tinsel wire, and the other end of the tinsel wire is joined to the terminal 29. Here, the lead wire 30 is composed of a tinsel wire and a metal foil 32, and the metal foil 32 is joined to the coil 19 on the bobbin 20, and the bobbin 20 is connected between the upper end of the bobbin 20 and the upper end of the first cylinder 15. The outer peripheral surface of the metal foil 32 exposed on the outer peripheral surface is joined to one end of the tinsel wire, and the tinsel wire passes through the diaphragm 27 and the other end is connected to the terminal 29.

In the second embodiment, since the wiring in which the lead wire 30 extends along the connecting portion 18 is not required, the assembly of the speaker is facilitated, the stress caused by the assembly of the speaker on the lead wire 30 is hardly generated, and the robustness is achieved. By relaying the kinshi wire on the bobbin 20, the reliability against the disconnection is improved.

Further, since the dust cap 31 is joined to the inner peripheral surface of the bobbin 20 at the upper end, the dust cap 31 does not cover the outer peripheral surface of the bobbin 20. Accordingly, the exposed portion of the bobbin 20 can be set to a minimum in order to secure a portion where the tinsel wire is fixed to the metal foil 32, which is advantageous in forming a thin speaker.

The shape and arrangement of the metal foil 32 and the direction in which the tinsel wire is joined at the junction between the metal foil 32 and the tinsel wire have been described by way of example, but the present invention is not limited thereto. May be arranged facing each other, and the kinshi line may be coupled upward.

(Embodiment 3) FIG. 3 is a cross-sectional view of Embodiment 3 of a speaker according to the present invention, and mainly describes the speaker according to the third aspect. Regarding the numbers in the figure, the same parts as those in the above-described embodiments are given the same numbers. According to the drawing, reference numeral 33 denotes a second damper. The difference from the previous embodiments is that the inner peripheral portion of the second damper 33 is folded downward to form the second cylinder 16.
The structure is fixed to the outer peripheral surface.

The second damper 33 is connected to the first damper 28
As a result, the asymmetric component in the radiated sound due to the vertical symmetry of the amplitude can be reduced. Further, when assembling the speaker, the second damper 3 is used.
An adhesive can be easily applied from above to the joint portion between the third damper 3 and the connecting portion 18, and the upper end of the inner periphery of the first damper 28 and the end of the inner periphery of the second damper 33 turned back. Since the structure for fixing the portion is made possible, the joining area of the inner peripheral portion of the second damper 33 is secured, the joining strength is sufficient, and the reliability of the speaker is improved.

(Embodiment 4) FIG. 4 is a sectional view of a speaker according to a fourth embodiment of the present invention, and mainly describes the speaker according to the fourth aspect. Regarding the numbers in the figure, the same parts as those in the above-described embodiments are given the same numbers. According to the figure, 34 is a third cylinder,
35 is a fourth cylinder, and 36 is a second ring. The third embodiment differs greatly from the third embodiment in that the second cylinder 16 has a third cylinder 34 having two different diameters, a fourth cylinder 35,
It is composed of a second ring 36 connecting the third cylinder 34 and the fourth cylinder 35, and the third cylinder 34 is located above the fourth cylinder 35, Cylinder 35
Is set large.

Further, the inner peripheral surface of the inner peripheral portion of the diaphragm 27 is fixedly attached to the outer peripheral surface of the third cylinder 34, and the inner peripheral portion of the second damper 33 is turned upward to form an outer periphery of the third cylinder 34. And the upper surface of the second ring 36 is fixed to the lower surface of the inner peripheral portion of the second damper 33. The inner peripheral portion of the first damper 28 is turned upward to form the fourth cylinder 35. The upper surface of the reinforcing portion formed by bending the lower end of the fourth cylinder 35 in the outer diameter direction and the lower surface of the inner peripheral portion of the first damper 28 are fixed to the outer peripheral surface.

The first damper 28 and the second damper 33
Both have a structure in which the respective inner peripheral portions are turned upward to increase the bonding area to the connecting portion 18, so that the fitting into the connecting portion 18 becomes easy at the time of assembling the speaker, and the first damper 28 and the second The joint area between the second damper 33 and the connecting portion 18 is sufficiently ensured, and the fixing strength can be increased, which helps to improve the reliability of the speaker as in the previous embodiments. Further, an outer peripheral portion of the connecting portion 18,
That is, since the second cylinder 16 has a stepped structure, the mechanical strength in the radial direction of the connecting portion 18 itself can be increased, and it can be developed into a high-output speaker.

In the fourth embodiment, the lead wire 30 is shown in the same drawing as that of the second embodiment, but the present invention is also applicable to the case where the lead wire 30 is wired as in the first embodiment. Similar effects can be obtained.

(Embodiment 5) FIG. 5 is a cross-sectional view of Embodiment 5 of the speaker of the present invention, and mainly describes the speaker according to the fifth aspect. Regarding the numbers in the figure, the same parts as those in the above-described embodiments are given the same numbers. According to the drawing, reference numeral 37 denotes a third ring. The difference from the second embodiment is that a third ring 37, which is a weight addition, is fixed to the upper surface of the first ring 17.

In general, a speaker can reproduce a lower sound as the weight of the vibration system including the diaphragm 27 and the voice coil 21 is larger. Therefore, a speaker dedicated to heavy bass reproduction called a subwoofer is intended for the weight of the diaphragm 27 and the like. It is bigger. Therefore, by disposing the third ring 37 serving as a weight on the connection portion 18 having sufficient mechanical strength, the third ring 37 also serves as an effective means for avoiding deformation of the speaker due to the addition of the third ring 37.

The material constituting the third ring 37 is as follows.
For example, if a resin-based material having a large internal loss is used, it goes without saying that it is a means for suppressing unnecessary resonance that occurs when the speaker is driven.

(Embodiment 6) FIG. 6 is a cross-sectional view of Embodiment 6 of the speaker according to the present invention, and mainly describes the speaker according to Claim 6. Regarding the numbers in the figure, the same parts as those in the above-described embodiments are given the same numbers. The difference from the fifth embodiment is that the outer peripheral portion of the third ring 37 is folded downward, and the lower surface and the folded inner peripheral surface of the third ring 37 and the upper surface of the first cylinder 15 and the second ring 37, respectively. This speaker has a structure that is fixed to the outer peripheral surface of the cylinder 16 and can suppress the increase in the overall height of the speaker due to weight addition when expanding to a subwoofer. It can be secured.

The same effect can be obtained even if the third ring 37 is folded back and fixed to the third cylinder 34 in the fourth embodiment.

The magnetic circuit described in the above embodiments is the most general type of the inner magnet type, and is not limited to this, and may be a magnetic circuit having, for example, a radially magnetized magnet. Similar effects can be obtained.

The above embodiment can be developed as shown in the sectional view of FIG. That is, a joint 38 is provided between at least the first cylinder 15 and the second cylinder 16 to form the connecting portion 18, and the joint 38 is driven when the speaker is driven.
However, the same effect can be obtained as a speaker having a structure in which a slit 39 is provided to avoid collision with the yoke 24.

[0039]

As described above, according to the present invention, it is possible to provide a loudspeaker in which the damper bonding strength is enhanced and the reliability is sufficiently ensured.

[Brief description of the drawings]

FIG. 1 is a sectional view of Embodiment 1 of a speaker according to the present invention.

FIG. 2A is a sectional view of the second embodiment. FIG. 2B is a front view of a voice coil which is a main part of the second embodiment.

FIG. 3 is a sectional view of the third embodiment.

FIG. 4 is a sectional view of the fourth embodiment.

FIG. 5 is a sectional view of the fifth embodiment.

FIG. 6 is a sectional view of the sixth embodiment.

FIG. 7 is a sectional view of the developed example.

FIG. 8 is a sectional view of a conventional speaker.

FIG. 9 is a sectional view of the thin speaker.

[Description of Signs] 15 First cylinder 16 Second cylinder 17 First ring 18 Connecting portion 19 Coil 20 Bobbin 21 Voice coil 22 Magnet 23 Plate 24 Yoke 25 Frame 26 Edge 27 Vibration plate 28 First damper 29 Terminal 30 Lead wire 31 Dust cap 32 Metal foil 33 Second damper 34 Third cylinder 35 Fourth cylinder 36 Second ring 37 Third ring 38 Joint 39 Slit

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroyuki Takewa 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. F term (reference) 5D012 BA07 BC02 CA06 CA07 FA04 GA01

Claims (6)

[Claims] 1. A connection having a first ring connecting at least an inner first cylinder, an outer second cylinder, an upper end of the first cylinder, and an upper end of the second cylinder formed on at least concentric circles. Part, a voice coil formed of at least a coil and a bobbin, a magnetic circuit having a magnetic gap into which the voice coil is inserted, a frame, a diaphragm having an outer peripheral portion fixed directly or indirectly to the frame, and a frame. And an inner peripheral surface of the first cylinder is fixed to an outer peripheral surface of the bobbin, and an inner peripheral portion of the damper is folded upward to form an inner peripheral surface of an inner peripheral portion of the diaphragm. The outer peripheral surface of the second cylinder, the upper end of the inner peripheral portion of the damper, and the lower end of the inner peripheral portion of the diaphragm are joined together, and the lower end of the second cylinder is folded back in the outer radial direction to form an upper surface of the reinforcing portion. And a spinner fixed to the lower surface of the inner peripheral portion of the first damper. Oka. 2. An upper end of the bobbin is located at least above an upper end of the first cylinder, the dust cap is joined to an inner peripheral surface of the bobbin and an upper end, and a lead wire is formed of a tinsel wire and a metal foil, The metal foil is formed on the bobbin and joined to the coil, and is joined to one end of the tinsel wire and the outer peripheral surface of the metal foil exposed on the outer peripheral surface of the bobbin between the upper end of the bobbin and the upper end of the first cylinder, The speaker according to claim 1, wherein the tinsel wire penetrates the diaphragm and the other end is connected to the terminal. 3. A connection having a first ring connecting at least an inner first cylinder, an outer second cylinder, an upper end of the first cylinder, and an upper end of the second cylinder formed at least on concentric circles. Part, a voice coil formed of at least a coil and a bobbin, a magnetic circuit having a magnetic gap into which the voice coil is inserted, a frame, a diaphragm directly or indirectly coupled to the frame, and a frame. A first damper and a second damper having an outer peripheral portion fixed thereto, an inner peripheral surface of the first cylinder and an outer peripheral surface of the bobbin fixed to each other, and an inner peripheral surface of an inner peripheral portion of the diaphragm and a second cylinder; The upper surface of the reinforcing portion formed by fixing the inner peripheral portion of the first damper upward to be fixed to the outer peripheral surface of the second cylinder, and by folding the lower end of the second cylinder in the outer radial direction. And the lower surface of the inner peripheral portion of the first damper. Turn the inner circumference of the
Speaker fixed to the outer peripheral surface of the cylinder. 4. A connection having a first ring connecting at least an inner first cylinder, an outer second cylinder, an upper end of the first cylinder, and an upper end of the second cylinder formed at least on concentric circles. Part, a voice coil formed of at least a coil and a bobbin, a magnetic circuit having a magnetic gap into which the voice coil is inserted, a frame, a diaphragm directly or indirectly coupled to the frame, and a frame. A first damper and a second damper having an outer peripheral portion fixed thereto, and a third cylinder, a fourth cylinder, a third cylinder, and a fourth cylinder each of which has a different diameter from the second cylinder. The third cylinder is located above the fourth cylinder, the fourth cylinder is set larger than the third cylinder, and the inner peripheral surface of the first cylinder is formed. And the outer peripheral surface of the bobbin are fixed to the inner peripheral surface of the inner peripheral portion of the diaphragm. Fixed to the outer peripheral surface of the third cylinder,
The inner peripheral portion of the second damper is turned upward and fixed to the outer peripheral surface of the third cylinder, and the upper surface of the second ring and the lower surface of the inner peripheral portion of the second damper are fixed to each other. The inner peripheral portion of the damper is turned upward to be fixed to the outer peripheral surface of the fourth cylinder, and the lower end of the fourth cylinder is folded outward in the radial direction to form the upper surface of the reinforcing portion and the inner peripheral portion of the first damper. Speaker fixed to the bottom. 5. The third ring, which is a weight addition product, is formed on the upper surface of the first ring.
The speaker according to claim 3 or 4, wherein the ring is fixed. 6. An outer peripheral portion of the third ring is folded downward,
The lower surface and the folded inner peripheral surface of the third ring and the upper surface of the first ring and the outer peripheral surface of the second cylinder or the third surface, respectively.
6. The speaker according to claim 5, wherein the speaker is fixed to the outer peripheral surface of the cylindrical member.