JPH11252691A - Speaker structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make this speaker small-sized by making a cross-section from an inner peripheral part of a damper seat that is a damper adhering tab part of a speaker frame to an outer peripheral part of a lower part of a magnetic circuit a linearly connected shape. SOLUTION: The cross-section of a frame bottom part 12 that is lower than a damper seat 13 is molded in a W shape so that resonance of the part 12 on which a neodymium repulsion type magnetic circuit RM is mounted may be basically a little and also that molding may be easy to be performed. A central part of the part 12 rises in a projecting shape, a summit part of a projecting part 12M has a flat end part having an optional diameter and the circuit RM is mounted on the flat end part. By being such a frame shape, curved surface where resonance is hard to occur is configured between an inner peripheral part of the seat 13 and the neodymium repulsion type magnetic circuit mounted part 12M. The shape of a frame 1 adapts to the shape of the circuit RM whose outer diameter dimension is small so as to get a speaker that has the circuit RM which is hard to resonate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker structure, and more particularly to a structure of a repulsion type magnetic circuit type loudspeaker for weight reduction.

[0002]

2. Description of the Related Art In recent years, in particular, speakers have been strongly demanded to be reduced in weight. The frame and the magnetic circuit part of the speaker components occupy most of the weight of not only the in-vehicle speaker but also the general speaker. For example, if we explain the example of a speaker that we provide with a 6.5 inch diameter speaker that is most frequently used as an in-vehicle speaker, the weight of the speaker alone is about 630 g, and the breakdown of each component is that the frame is 138
g, the magnetic circuit portion is about 483 g, the vibration system component is 3.2 g, and the others are 5.8 g.

In order to reduce the weight of a speaker as described above, it is naturally most effective to reduce the weight of the magnetic circuit portion, which occupies about 77% of the weight of the speaker alone, as shown in FIG. Is much higher than the ferrite magnet M1, as shown in FIG.
When the repulsion type magnetic circuit RM using the RM2) is used, the magnetic circuit is significantly reduced in weight, so that the frame supporting the magnetic circuit is far less than the frame supporting the magnetic circuit using the conventional ferrite magnet. Only strength is required.

[0004] That is, by reducing the weight of the magnetic circuit M, the strength of the frame 1 can be increased, and the weight of the frame can be further reduced, which is extremely effective in reducing the weight. We use a neodymium repulsion type magnetic circuit RM weighing 65 g and an aluminum frame 1 weighing 40 g formed by pressing an aluminum plate 0.7 mm.
A practical speaker with a 6.5 inch diameter speaker and a unit weight of 130 g or less is provided.

[0005] As a main means of reducing the weight at present, the weight of the magnetic circuit M and the weight of the frame are also reduced, and the neodymium magnet M1 will continue to have higher performance in the future. Is expected to contribute to weight reduction, but the weight of the frame is already close to its limit in the case of a metal frame or a resin frame that is widely used at present.

In other words, the current frame, particularly the frame of the vehicle speaker, has a rational form in pursuit of cost and function, and the weight of the frame can be further reduced by a method such as thinning the frame. If this is done, the strength of the frame will be extremely insufficient, and frame resonance will easily occur, or the frame will be deformed when mounted in the vehicle cabin, and the body of the frame may not be formed.

For example, in the case of the aluminum frame 1, even if the aluminum frame 1 has a thickness of 0.7 mm (approximately 40 g), the sound quality is not significantly deteriorated due to the frame resonance within a generally used range. The required strength is secured. However, the aluminum frame 1 having a thickness of 0.7 mm has a strength of about 1/2 as compared with the iron frame 1 having a thickness of 0.7 mm. Therefore, when the speaker of the aluminum frame 1 is mounted in a vehicle interior, There is a high risk of deforming the mounting flange 11 of the speaker, particularly the vicinity of the mounting screw hole, in the screw tightening operation.

Therefore, at present, the thickness of the frame 1 is 0.7
By increasing the diameter from 1 mm to 1 mm, screw deformation of the flange portion is prevented. That is, the strength of the flange portion is enhanced by increasing the overall strength of the frame 1, and naturally, the weight of the frame 1 is also increased to a frame weight of about 40 g to about 60 g.

Considering that the weight reduction is the highest priority, it is sufficient that the frame flange portion 11 having a thickness of 0.7 mm (40 g) of the frame 1 is not deformed. It is conceivable to reinforce the flange portion 11 by attaching a spacer having a thickness such as a resin or a ring made of metal or the like by bonding or the like.

However, when the weight of the spacer is 20 g or more, the weight of the frame 1 becomes the same as the thickness (60 g) when the thickness of the frame 1 is reduced from 0.7 mm to 1 mm, and the effect of weight reduction is reduced.
It is an essential condition that the weight of the spacer is 20 g or less, and a material that is as light as possible and has a strength that can withstand the screw tightening force is required. As described above, various countermeasures are required for the deformation of the flange portion 11.

On the other hand, the only method for preventing the resonance of the frame 1 is to increase the strength of the frame 1 or to manufacture the frame 1 by selecting a material that does not easily resonate. That is, frame 1
The main factor of the resonance is due to the repulsion operation by the magnetic circuit M, and there is a corresponding method such as a strength enough to withstand the repulsion operation, for example, a sufficient thickness of the frame 1 or an appropriate arrangement of the reinforcing ribs. Generally, the method of preventing resonance tends to increase the weight.

However, the current neodymium repulsion type magnetic circuit RM is mounted on a frame 1 for an external magnet type magnetic circuit M using a conventional ferrite magnet as shown in FIG. When the magnetic type magnetic circuit M is mounted, resonance of the frame 1 is unlikely to occur. However, when the neodymium repulsion type magnetic circuit RM is mounted, resonance of the frame 1 is likely to occur. It was found that this was caused by the flat shape of the part.

In the following, the neodymium repulsion type magnetic circuit RM is mounted on the frame 1 via a holder H mounted on the frame bottom 12 as shown in FIG. Holder H to
Depending on the mounting state, there are cases where the frame 1 resonates and does not occur.
It was found that, when the holder H was screwed and mounted, no resonance was generated.

The holder H is made of aluminum.
1, or about 1-2 m thick with a cross-sectional shape as shown in FIG.
A guide pole H2 of the neodymium repulsion type magnetic circuit RM is integrally provided at the center of a substantially disk-shaped bottom H1 of about m. In FIG. 11, an example of caulking is shown in FIG.
As shown in FIG. 5, the aluminum frame 1 of 40 g (plate thickness 0.7
mm), a holder H is mounted in a hole 12H provided at the center of the bottom portion 12, and the holder H is inserted into a predetermined position on the upper surface of the flange portion H1 at the bottom of the holder as shown in FIG. A ring-shaped convex portion H4 having a height of 1.5 mm and a width of about 1 mm is provided.

The outer peripheral portion of the ring-shaped convex portion H4 is inserted into the inner peripheral portion of the hole 12H, and as shown in a local enlarged view of FIG. The holder H is mounted on the frame 1 by press deformation with a width of about 1 mm and caulking the convex portion H4 into the hole 12H.
After the mounting, the voice coil Vc, the diaphragm Df, the damper S, the neodymium repulsion magnetic circuit RM, and the like, which are vibration system components, are mounted to complete a speaker.

In FIG. 12, an example of mounting the holder H with screws is described.
The holder H is screwed through the holes 12h (see FIG. 15) for mounting the ferrite external magnet type magnetic circuit M, which are provided at four locations 90 degrees apart from the holes 12H provided on the bottom portion 12 of the 7 mm). The thickness of the holder H is about 3 mm outside the ring-shaped convex portion H4 of the crimping holder H.
mm, and a female screw portion is provided at a position corresponding to the magnetic circuit M mounting hole 12h.

In the case of such screwing, the ring-shaped convex portion H4 serves as a guide for positioning the holder H and the frame 1, and the outer peripheral portion of the convex portion H4 is inserted into the inner peripheral portion of the hole 12H. The female screw hole of the portion H1 is aligned with the hole 12h for mounting the magnetic circuit M of the frame 1, and four places are provided with the screw b.
And the holder H is mounted on the frame 1. After the mounting, the voice coil Vc, the diaphragm Df, the damper S, the neodymium repulsion type magnetic circuit RM, and the like, which are vibration system components, are mounted to complete the speaker.

The outer diameter of the neodymium repulsion magnetic circuit RM is much smaller than that of the ferrite external magnetic circuit M. Therefore, when arranging the neodymium repulsion magnetic circuit RM on the frame bottom 12, the diameter of the neodymium repulsion magnetic circuit RM can be smaller than the diameter of the conventional hole 12 </ b> H. A flat portion 12F is generated therebetween, and the flat portion 12F is vibrated by the magnetic circuit M, so that the structure easily resonates. Comparing the two cases of the caulking mounting structure that causes frame resonance and the screwing structure that does not cause frame resonance, the caulking mounting structure is a structure closer to the resonance generating structure.

In the case of the screwing structure, since the thickness of the flange portion H1 provided with the female screw hole is large, the frame bottom portion 1 is formed.
2, that is, a shape that reinforces the flat portion 12F, and the strength is greatly increased.

Incidentally, as shown in FIG. 14, a conventional ferrite external magnet type magnetic circuit M is mounted on the aluminum frame 1 of 40 g.
Even if an input signal is applied to a speaker with a weight of 480 g, frame resonance does not occur. Also, as shown in FIG.
When the neodymium repulsion magnetic circuit RM is directly provided on the frame 1 in a state where there is no H, that is, the flat portion 1 between the outer periphery of the neodymium repulsion magnetic circuit RM and the outer periphery of the frame bottom 12
It was also confirmed that frame resonance similarly occurred even when the 2F dimension was large.

Therefore, the frame 1 used at present has a shape suitable for the ferrite external magnet type magnetic circuit M. In order to use a small and high-performance magnetic circuit such as a neodymium repulsion type magnetic circuit RM, the frame bottom is used. Flat portion 12 in 12
It is necessary to increase the thickness of F, that is, to increase the weight, so that the effect of the neodymium repulsion magnetic circuit RM for the purpose of reducing the weight cannot be obtained, and that the shape is not suitable for reducing the weight of the frame 1. found.

[0022]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, and is advantageous in that a neodymium repulsion type magnetic circuit RM is used.
An object of the present invention is to provide a frame 1 having a shape that is less likely to resonate even when a small, high-performance magnetic circuit is mounted thereon and is suitable for weight reduction, and a mounting structure of a neodymium repulsion type magnetic circuit RM suitable for the frame 1 shape. .

[0023]

In order to solve the above-mentioned problems, a flat plate existing from the inner peripheral side of a damper seat 13 to a frame bottom 12 like a conventional frame 1 having a ferrite external magnetic type magnetic circuit M mounted thereon. The portion 12F is eliminated, and the portion from the inside of the damper seat 13 to the vicinity of the outer periphery of the lower end of the magnetic circuit M is obliquely and almost linearly connected.
The portion of the frame bottom 12 to which the repulsion type magnetic circuit RM is attached is raised, an arbitrary convex shape is provided, and the section from the inside of the damper seat 13 to the lower end of the convex portion 12M is linearly connected in cross section. Was formed into a W-shape.

The frame 1 on the lower surface of the damper S
If more strength is required, a rib 12L structure is provided inside the damper seat 13, and a flange portion is provided at the end of the holder H in order to stably improve the strength of the mounting portion of the magnet M1 in a lightweight and stable manner. H1 and the flange portion H
1 is the back side of the frame bottom 12 or the protrusion 12
The mounting portion of the frame 1 is held between the flange H1 and the bottom of the lower magnet RM2 of the neodymium repulsion type magnetic circuit RM.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker structure according to the present invention will be described with reference to FIGS. 1 to 10. The same reference numerals as in the prior art denote the same parts. In order to obtain the speaker frame 1 of the present invention, in this embodiment, a general metal frame 1 is used.
A frame 1 made of carbon fiber reinforced plastic (hereinafter referred to as CFRP), which is inexpensive and has a lighter weight than the metal frame 1, has been manufactured. The structure can be applied to a metal frame 1 for the purpose of weight reduction, for example, a frame 1 made of aluminum, titanium, or the like.

As a raw material for the frame of this embodiment, a carbon woven fabric obtained by plain weaving carbon fibers in a flat state with 3,000 filaments and 13 yarns per inch for both warp and weft was obtained. The cloth was coated with a vinyl ester resin having a weight corresponding to about 40% of the weight of the woven cloth, to obtain a carbon woven cloth CF in a prepreg state in which the resin was generally called a B stage.

The three woven fabrics CF were hot-pressed with press dies D1 and D2 to obtain a molded product CFC made of CFRP as shown in FIG. 2 and FIG. The molding conditions were as follows: the molding die temperature was 140 ° C., the pressing pressure was 15 tons (shaft output), and the molding time was 3 minutes. Further, the molded article C
An unformed and excess portion on the outer peripheral portion of the FC flange portion 11 was cut out by a press or the like, and a CFRP frame 1 dedicated to mounting a repulsion type magnetic circuit RM as shown in FIG. 4 was produced.

The shape and schematic dimensions of the frame 1 will be described with reference to FIG.
Has an outer diameter of 160 mm. The flange portion 11 is a mounting portion of the diaphragm edge E and has an inner diameter of 127.9 mm.
The flange has a rising portion of about 5.8 mm on the outer periphery. The maximum depth from the rising portion is 41.4 mm, and the depth from the back of the flange 11 is 2 mm.
85.2mm outside diameter and 5.9mm wide at 2.8mm
Is provided.

A straight line is connected to the diagonally lower position of 21.7 mm inward from the inner peripheral portion of the damper seat 13 and 9.2 mm in the depth direction.
The cross-section of each straight line is connected by a curve having a radius of 0.2 mm to 2.4 mm, and the cross section of the frame bottom portion 12 below the damper seat 13 has a substantially W-shape.

By forming the cross-sectional shape, the frame bottom 12 on which the neodymium repulsion magnetic circuit RM is mounted is mounted.
Is basically reduced in shape, and molding can be easily performed. Further, as shown in FIG. 4, in order to form a hole for mounting the frame 1 in the flange portion 11 of the molded product and a frame support portion between the flange portion 11 and the damper seat 13, an extra portion is punched out and pressed. The speaker frame 1 is completed through a trimming step of cutting. The completed weight of the CFRP frame 1 was about 32.3 g.

As described above, since the central portion of the frame bottom portion 12 has a convex shape, the top portion of the convex portion 12M has a flat portion having an arbitrary diameter, and the flat portion is formed of neodymium. A repulsion type magnetic circuit RM mounting portion. In the case of the present embodiment, a mounting hole 12Mh for a holder H having a diameter of 6 mm is provided at the center of the flat portion in the trimming step, and a holder H as shown in FIG. 1 and the like is mounted in the hole 12Mh. . Holder H is aluminum pole H
2 has an outer diameter of 5.98 mm, an inner diameter of 3.6 mm, and a length of 21.5
mm pipe with an outer diameter of 15 mm at one end of the pipe.
A flange H1 having a thickness of 1 mm and a thickness of 1 mm is provided, and the other end is provided with a female screw H3 having a diameter of 3 mm and an effective screw portion of 5 mm.

The mounting method of the holder H in the present embodiment is such that an acrylic adhesive is applied to the flange portion 11, and the pole portion H2 of the holder H is further attached to the mounting hole 1 of the holder H.
2Mh from the back side, and the flange portion 11 is pressed against the back side of the magnetic circuit mounting portion 12M, and the pressed state is maintained until the adhesive hardens and exhibits a predetermined strength. The H1 portion is adhered to the back surface side of the magnetic circuit mounting portion 12M. In this embodiment, the process was performed as follows.

Referring to FIGS. 5 to 7, a brass material having an inner diameter of 6 mm, an outer diameter of 25.38 mm, and a length of 21 m
After inserting a voice coil positioning jig J having a shape provided with a hole in a cylindrical column of m into the holder pole portion H2, the female screw H3 is provided on the top of the holder H as described above. Jig J bottom and holder H flange H
One part sandwiches the magnetic circuit mounting portion 12M of the frame 1, and the surface of the holder flange H1 coated with the adhesive is extremely strongly pressed against the back surface of the magnetic circuit mounting portion 12M.

Further, as shown in FIG. 6, while the jig J is mounted on the magnetic circuit mounting portion 12M together with the holder H, vibration components such as the voice coil Vc, the damper S, and the diaphragm Df are mounted. The method is similar to that of a conventional general speaker, and is based on bonding. When the adhesive used at the time of mounting reaches the expected strength, the screw b fastened to the top of the holder H is removed as shown in FIG. 7, and the voice coil positioning jig is removed from the holder H. Since the vibration system components and the holder flange H1 are adhered and fixed based on the inner diameter of the voice coil Vc, the outer diameter of the holder pole H2 and the inner diameter of the voice coil Vc are in a mounted state in which predetermined positions are maintained. .

Further, the neodymium repulsion type magnetic circuit RM is mounted on the holder H in this state, the voice coil Vc as a vibration system component, the diaphragm Df, and the frame 1 with the damper S.
Neodymium magnets RM1 and RM2 used in this embodiment
Has an outer diameter of 25 mm, an inner diameter of 6.1 mm, and a thickness of 8 mm. A center plate RM3 for holding the magnets RM1 and RM2 with the same poles facing each other is made of soft iron having an outer diameter of 25 mm, an inner diameter of 6.02 mm, and a thickness of 4 mm. The neodymium repulsion type magnetic circuit RM has a completed weight of about 69.4 g.

As shown in FIG. 7, the inner diameter of the neodymium repulsion type magnetic circuit RM is inserted into the holder H, the voice coil Vc as a vibration system component, the diaphragm Df, and the holder pole H2 of the frame 1 with the damper S. Then, the magnetic circuit RM
Diameter of center plate RM3 and voice coil Vc
The neodymium repulsion type magnetic circuit RM is installed with a predetermined clearance set at the inner diameter of. After the installation of the magnetic circuit RM, as shown in FIG. 7, when the magnetic circuit fixing screw Mb is further attached to the female screw H3 provided on the holder pole H2 and tightened, the lower magnet RM of the neodymium repulsion type magnetic circuit RM is obtained.
2 and the flange H1 of the holder H are the frame 1
And the neodymium repulsion type magnetic circuit RM is fixed and the speaker is completed.

The completed weight of the loudspeaker is about 122 g, and its frequency characteristics are measured. The loudspeaker shows characteristics equal to or higher than those of the conventional loudspeaker. No problems caused by the frame 1, particularly, problems such as deterioration of sound quality due to resonance can be found. Was. Furthermore, the strength of the mounting flange of the speaker was sufficient, and deformation due to screw b tightening was hardly observed in various mounting experiments, confirming that there was no problem in the practical range.

[0038]

EXAMPLE In this embodiment, the center of the frame bottom 12 was raised to a convex shape of about 4 mm as described above in order to satisfy the speaker specifications, and the cross section of the frame bottom 12 was substantially W-shaped. In such a case, for example, when the amplitude of the diaphragm may be small, or when it is desired to increase the strength of the mounting portion of the magnetic circuit M at the expense of a slight reduction in weight, a convex portion as shown in FIGS. The rib 12L as shown in FIG. 8 may be integrally formed between the inner peripheral portion of the damper seat 13 and the bottom of the magnetic circuit in order to further increase the strength.

[0039]

According to the frame shape of the present invention, the portion between the inner peripheral portion of the damper seat 13 and the mounting portion 12M of the neodymium repulsion type magnetic circuit is constituted by a curved surface which is difficult to resonate. Flat part 1 that is easy to resonate like
2F can be almost eliminated. Accordingly, the shape of the frame 1 is such that the neodymium repulsion type magnetic circuit R having a small outer diameter
It has become possible to obtain a speaker having a neodymium repulsion type magnetic circuit RM which is adapted to the shape of M, is lightweight and hardly resonates.

The shape of the frame 1 is smaller than that of the damper seat 13, but has no gentle fall from the inner peripheral portion of the damper seat 13 unlike the conventional frame 1, so that the frame 1 has a gentle inclination. Has the effect of improving moldability in a better direction and improving productivity.

Further, a conventional ferrite external magnet type magnetic circuit M
Since the frame 1 structure in which the rib 12L structure is provided on the lower surface of the damper S, which is not possible with the frame 1 having the above, is possible, it is possible to easily further improve the strength of the frame 1.

Further, a flange H1 is provided at an end of the holder H, and the flange H1 is mounted on the back side of the frame bottom portion 12, and the flange H1 and the neodymium repulsion type magnetic circuit R are mounted.
Since the magnetic circuit mounting portion 12M of the frame 1 is sandwiched between the bottoms of the lower magnets RM2 of the frame M, a thin metal plate can be formed as in a conventional general method of mounting a repulsive magnetic circuit RM as shown in FIG. The burring process for providing the female screw portion on the frame 1 is not required, and the repulsion type magnetic circuit mounting RM can be easily mounted on a CFRP frame or the like where burring cannot be performed.

Further, the magnetic circuit mounting portion 12M is formed at the flange portion.
, The substantial thickness of the mounting portion 12M is increased, so that the strength of the mounting portion 12M is greatly improved, and a tough loudspeaker structure which is lightweight but sufficiently resistant to external impact can be obtained. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a repulsion type magnetic circuit speaker showing an embodiment of a speaker structure of the present invention.

FIG. 2 is a cross-sectional view showing a molding die for a CFRP frame.

FIG. 3 is a cross-sectional view showing a state where the frame is hot-pressed.

FIG. 4 is a perspective view showing a frame before trimming processing and in a completed state.

FIG. 5 is a sectional view showing a state where the holder is mounted on the frame.

FIG. 6 is a sectional view showing a state in which a vibration system is mounted on a frame.

FIG. 7 is a sectional view showing a state in which a repulsion type magnetic circuit is mounted on a frame.

FIG. 8 is a perspective view showing a state in which ribs are provided on a frame.

FIG. 9 is a sectional view showing another embodiment of the present invention.

FIG. 10 is a sectional view showing another embodiment of the present invention.

FIG. 11 is a cross-sectional view and a partially enlarged perspective view showing a conventional speaker in which a holder is attached to a metal frame by caulking and a neodymium repulsion type magnetic circuit is attached.

FIG. 12 is a cross-sectional view showing a conventional speaker in which a holder is mounted on a metal frame with screws and a neodymium repulsion type magnetic circuit is mounted.

FIG. 13 is a sectional view showing a conventional speaker in which a neodymium repulsion type magnetic circuit is mounted on a metal frame with screws.

FIG. 14 is a cross-sectional view showing a conventional speaker in which an external magnetic circuit is crimped to a metal frame.

FIG. 15 is a perspective view showing a conventional metal frame.

[Explanation of symbols]

 Reference Signs List 1 frame 11 flange portion 12 frame bottom portion 12F flat portion 12H hole 12h hole 12L rib 12M repulsion type magnetic circuit mounting portion 12Mh holder mounting hole 13 damper seat CF carbon woven fabric CFC CFRP molded product D1 mold D2 mold E edge Df vibration Plate H Holder H1 Flange H2 Pole H3 Female screw H4 Ring-shaped convex J Positioning jig M External magnetic circuit M1 Magnet M2 Yoke M3 Plate M3d Dowel Mb Magnetic circuit fixing screw RM Repulsion magnetic circuit RM1 Upper magnet RM2 Lower magnet RM3 Plate S Damper Vc Voice coil b Screw

Claims (4)

[Claims] 1. A center plate (RM) made of a magnetic material.
3) The two magnets (RM1) and (RM2) are disposed so that the same poles are opposed to each other with a repulsive magnetic circuit (RM) for forming a repulsive magnetic field around the center plate (RM3). In a repulsion type magnetic circuit type loudspeaker having a voice coil arranged in the repulsion type magnetic field, a lower end of the magnetic circuit is provided from an inner peripheral portion of a damper seat (13) which is a damper attachment portion of the speaker frame (1). A speaker structure in which the outer periphery of the portion is linearly connected in cross section. 2. A center plate (RM) made of a magnetic material.
3) The two magnets (RM1) and (RM2) are disposed so that the same poles are opposed to each other with a repulsive magnetic circuit (RM) for forming a repulsive magnetic field around the center plate (RM3). In a repulsion type magnetic circuit type speaker having a voice coil arranged in the repulsion type magnetic field, a portion (12M) of the frame bottom (12) to which the repulsion type magnetic circuit is attached is raised to provide a protrusion (12M), The section from the inner peripheral side of the seat (13) to the lower end of the projection (12M) is linearly connected in cross section, and the frame bottom (12)
The speaker structure according to claim 1, wherein the cross section of the speaker has a W-shape. 3. The speaker structure according to claim 1, wherein an arbitrary rib (12L) is provided inside the damper seat (13) of the frame (1). 4. An end portion of a rod-shaped magnet holder (H) supporting said repulsion type magnetic circuit (RM) is provided with a flange portion (H).
1), and the flange portion (H1) is attached to the frame bottom portion (1).
2) Or, it is mounted on the back side of the convex part (12M), and the bottom part (12) of the frame 1 or the convex part (12M) is formed by the flange part (H1) and the magnet (RM2) of the repulsive magnetic circuit (RM). 4. The structure of the speaker according to claim 1, wherein the speaker structure is sandwiched.