JP2001197590A - Edge for loudspeaker diaphragm and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an edge for a loudspeaker diaphragm where punch margin denoting a waste material part is small in the punching of the edge in a torus shape, the product yield is high, the cost is reduced, no environmental problem is caused in the treating of the waste part for an industrial waste, uneven quality in the performance of the edge is small, production of distorted sound based on partial resonance is eliminated so as to eliminated dispersion in the fundamental frequency (f0), the compliance of vibration of the diaphragm can easily be revised or corrected, the stiffness of the edge 6 in the circumferential direction is partially and consciously changed to suppress the resonance of the diaphragm, or the resonance of the diaphragm is conversely emphasized to change the frequency characteristic of the speaker. SOLUTION: A weatherproof resin is coated inside a woven cloth being a basic cloth by a screen print means to impregnate the resin inside the fibers of the woven cloth so as to form a 1st layer, other damping resin of a different material is laminated on the 1st layer by a similar means as a 2nd layer, and a synthetic resin with other property is laminated on the 2nd layer by a similar means, and the 1st layer or the 2nd layer is layered by partially changing the thickness in a concentric pattern on the surface and in a spotted way in the circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge of a loudspeaker diaphragm having a novel structure and a method of manufacturing the same.

[0002]

2. Description of the Related Art Referring to FIGS. 1, 2 and 3, the structure of a loudspeaker will be described. Reference numeral 1 denotes a loudspeaker, and 2 denotes an annular magnetic gap 2b having a magnetic flux density of usually 9000 to 12,000 gauss by a magnet 2a. Magnetic circuit,
The outside is held and fixed by a frame 7. A voice coil 3 is suspended in the annular magnetic gap 2b so as not to touch a domain wall, and a voice coil bobbin 3a is
And is attached to the frame 7 via a. At the tip of the voice coil bobbin 3a, the center of the tip of the truncated conical diaphragm 5 is adhesively fixed. The inner and outer peripheries of the edge 6 are formed with an inner pasting margin 6a adhered to the outer periphery of the diaphragm 5 and an outer pasting margin 6c adhered to the outer edge of the frame 7, respectively. Ridge-shaped projections 6 for providing vibration compliance of diaphragm 5 together with 4
b is formed.

When voice power is externally input to the voice coil 3, a magnetic field generated around the voice coil 3 induces a magnetic flux in the annular magnetic gap 2b to drive the voice coil 3 to vibrate in the axial direction. Is done. Then, the vibration of the voice coil 3 is transmitted to the diaphragm 5 to generate a sound.

Next, a manufacturing process of the conventional edge 6 'of the speaker diaphragm 5 will be described with reference to FIGS. FIG.
FIG. 7 is a diagram showing an edge molding mode in the manufacturing process, and FIG. 7 is a diagram showing the process by a processing step of punching the edge 6 from the base fabric 10. Thus, a long cloth material (base cloth 10) having a width of 1.5 m is stretched from the bobbin, and the coating resin 17 is coated on a support base 19 by a coating knife 18 by a squeezing method. After a heat treatment or the like by a heat treatment device 27 or the like equipped with a heating wire 25 and a molding by a molding press device 24 ′, the base fabric 10 coated with the resin 17 is punched into an annular shape by a punching die of an external shape cutting machine 26. , The edge 6 ′ is often used. FIG. 4 shows the external structure of the edges 6 and 6 'of the speaker diaphragm, and FIG. 5 shows a cross-sectional view of an enlarged cross-sectional structure of the edge 6 of the speaker diaphragm of the present invention (a circle shown by a chain line in FIG. 4). .

[0005] After the heat treatment, at the time of molding by the molding press device 24 ', the center of the ring in the radial direction is
A ridge-like projection 6b for compliance is formed in an annular shape concentric with the outer periphery, and glue margins 6a and 6c for attaching are formed on the inner periphery and outer periphery of a required width. The agent has been applied. Glue allowance for pasting them 6
In a and 6c, the outer periphery of the diaphragm 5 is adhered to the inner periphery of the edge 6 and the outer periphery of the frame 7 is adhered to the outer periphery 6c of the edge 6 '.
In this way, the edge 6 ′ suspends and holds the diaphragm 5 on the frame 7, and makes the vibration of the diaphragm 5 together with the damper 4 have compliance with the ridge-shaped protrusion 6 b,
The vibrating plate 5 vibrates freely in the axial direction, but functions to suppress the vibration in the lateral direction. The center of the tip of the truncated conical diaphragm 5 is bonded and fixed to the tip of the voice coil bobbin 3a. Then, the vibration of the voice coil 3 is transmitted to the diaphragm.

[0006]

Therefore, the edge 6 of the conventional diaphragm 5 for a speaker of this type is made of a material obtained by coating the entire surface of the base fabric body 10 with a coating resin 17 in the above-described manufacturing process. Outline cutting machine 2
When the outer shape is punched out and formed into an edge 6 by punching out the outer shape in 6 and the outer shape is punched out in a ring shape, a large punching slag 16 of an unnecessary portion of the material is generated, and the yield rate of the product is only about 25%. Because of the uneconomical nature, not only is cost reduction an urgent issue, but there is no disposal method other than treating the unused portion of the slag 16 as industrial waste. The situation is urgent. Further, when the conventional edge 6 ′ is attached to the speaker 1, the performance as the edge 6 ′ is not uniform in the impregnated state of the impregnated resin and the coating resin 17.
Since there is a lot of quality unevenness based on the non-uniformity of the adhesion state of the speaker, the generation of distorted sound due to the partial resonance of the vibration system including the diaphragm 5 and the edge 6 of the speaker is promoted, and the variation of the fundamental frequency (f ₀ ) is increased. There were drawbacks.

Further, once the coating resin 17 is once adhered to the edge 6 'of such a conventional diaphragm for a speaker, the material is changed, corrected or corrected for the elasticity (compliance) of the vibration during the process. There was also a problem that can not be. Furthermore, the hardness (stiffness) of the edge 6 in the circumferential direction is partially and consciously changed to suppress the resonance of the diaphragm 5, or to conversely emphasize the resonance of the diaphragm 5. Of the speaker 1
It was not possible to change the frequency characteristics of the device.

According to the present invention, a woven fabric serving as a base cloth is coated with a resin in an annular shape by screen printing means to form a back surface layer, and the outer surface thereof is annularly coated with another resin by the same means. Then, on top of that, another synthetic resin is annularly coated by the same means as above and laminated, and then the outer shape is punched and shaped, and then molded, so that the necessary minimum amount of resin is formed. Depending on the amount, elasticity (compliance) can be maintained only in necessary parts, and the elasticity can be adjusted entirely or partially as needed, and the product yield rate can be improved. In addition to improving cost savings, the waste material is only the slag 16 of the base fabric body 10, so that a small amount of industrial waste can be prevented from harming the environment. There is provided a structure of the edge 6 of speaker diaphragm 5,.

The configuration of the edge structure of the speaker diaphragm of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. 1 is a sectional view showing the structure of the speaker, FIG. 2 is a half sectional view of the speaker of FIG. 1, FIG. 3 is a quarter sectional view of the speaker of FIG. 1, FIG. FIG. 5 shows a cross section of the edge 6 of the speaker diaphragm 5 of the present invention corresponding to an enlarged portion of a partial cross section surrounded by a dashed line circle in FIG. FIG. 8 is a schematic view showing a manufacturing process of an edge according to the present invention, a schematic view showing a cross section at each stage, and FIG. 9 is a schematic view showing an aspect of a processing step of a base fabric of the edge according to the present invention. 10 is a plan view showing a nodal vibration of a speaker diaphragm, FIG. 11 is a view showing a cross section of a nodal vibration of the speaker diaphragm of FIG. 9, and FIG. 12 is a plan view showing a split nodal vibration of the speaker diaphragm. FIG. 13 is a diagram showing a cross section of a divided node vibration of the diaphragm of the speaker of FIG. FIG. 14 is a diagram showing a cross section of a speaker according to the fourth invention, which is provided with an edge in which a coating material is formed by transfer-molding a vibration damping layer in an annular shape inside the ridge-shaped protrusion of the edge, and FIG. FIG. 16 is a plan view of the loudspeaker of FIG. 16, and the vibration damping layer of the fourth invention is provided on the entire surface of the ridge of the edge or on the entire surface of the ridge.
FIG. 17 is a cross-sectional view of a speaker equipped with an edge on which a coating damping material layer is transferred and formed in a radial pattern in a circumferential pattern, and FIG. 17 is a plan view of the speaker of FIG.

[0010]

In order to solve the problem of the edge 6 of the conventional speaker diaphragm 5, a first invention is to provide a woven fabric 10 serving as a base cloth on the outer back surface. ,
A waterproof resin 13 is coated in an annular shape by screen printing means, embedded in fibers of the woven fabric 10 to a certain depth, and filled to form a backside layer 13. The outer surface is coated with a resin having another different weatherproof property in an annular shape by the same means as described above, the surface first layer 11 is laminated, and another vibration damping synthetic resin is further formed thereon. This is an edge of a speaker diaphragm characterized in that a surface second layer 12 is laminated by being annularly coated by the same means as described above. The second invention is the first invention.
The speaker according to the first invention, in which the outer periphery of the diaphragm 5 and a heat sealing adhesive 14 for bonding are formed on the inner surface and the outer surface of the waterproof back layer 13 at the edge 6 of the speaker diaphragm of the invention. The edge 6 of the diaphragm for use. In the third invention, at the edge 6 of the loudspeaker diaphragm of the first invention, the back surface layer 13 is made of an olefin resin mixed with a waterproof fluorine, the front surface first layer 11 is made of a weather-resistant acrylic resin, The edge 6 of the loudspeaker diaphragm of the first invention in which a damping SBR is used for the damping surface second layer 12.

According to a fourth aspect of the present invention, a vibration-damping surface second layer 12 is formed on the edge 6 of the loudspeaker diaphragm according to the first aspect of the present invention, with the thickness of the second layer 12 being varied over the surface and partially. An edge 6 of the speaker diaphragm according to the first aspect of the invention, in which the vibration damping performance is partially changed. According to a fifth aspect of the present invention, the woven fabric 1 is provided at the edge 6 of the speaker diaphragm of the first aspect.
Reference numeral 0 denotes an edge 6 of the loudspeaker diaphragm of the first invention, which is a phenol resin-processed 30 to 460 mesh tetron. According to a sixth aspect of the present invention, a weather-resistant basic coating material of a thixotropy super-polymer acrylic emulsion is transferred in an annular shape by screen printing means on the upper surface of a woven fabric which becomes a base fabric 10 which is spread by applying tension. Then, the first layer 11 is formed, and a coating material for damping the resonance force of rubber latex such as SBR or NBR is transferred onto the ring by screen printing to form the second layer 12,
Further, a back surface layer 13 of a filling coating material for retaining a waterproof function of the olefin resin in an annular shape by a silk screen method,
A waterproof structure composed of a hot melt adhesive 14 and an adhesive 15 is laminated on the lower surface outer peripheral portion and the inner peripheral portion of the back surface layer 13, respectively, and after heat treatment, the inner pasting allowance 6 a, the ridge-shaped protrusion 6 b, and the outer surface Pressing machine 2 for pasting paste 6c
4 is a method of manufacturing the edge 6 of the speaker diaphragm which is formed by punching out the outer shape into a required annular shape by the outer shape cutting machine 26.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A manufacturing process for forming the structure of an edge 6 of a speaker diaphragm according to the present invention will be described with reference to FIGS. The hollow arrows in FIG. 9 are enlarged views of a cross section in each step. Cotton cloth 10 serving as a base cloth A stretchable cloth such as a woven cloth of polyester or the like is stretched by applying tension, and as a basic coating material for the purpose of weather resistance, an ultra-high molecular acrylic emulsion imparted with thixotropy The first surface layer 11 of the above is circularly transferred onto one surface (for example, the upper surface) of the base fabric 10 by a stamper 20 to which a silk screen method is applied, and is formed into a layer. in addition,
A rubber latex such as SBR or NBR is applied to the damping coating material 12 for damping the resonance force by pressing the stamper 21 by applying the same silk screen method.
On the first surface layer 11, an annular transfer molding is performed to form a layer as the second surface layer 12.

Next, the base cloth 10 is turned over, and a layer 13 of an olefin resin having a waterproof function is formed on the lower surface of the base cloth 10 corresponding to a portion below the coating material layers 11 and 12 formed by the stamper 22. A coating material layer 13 for pinholes is formed by forming a layer in an annular shape by applying the same silk screen method as described above. Further, a speaker frame 7 is provided on an outer peripheral portion and an inner peripheral portion of the lower surface.
And hot melt adhesive 1 for thermal bonding to diaphragm
4 and 15 are applied by an adhesive application stamper 23. Thereafter, the heating wire 25 for heating is attached, and pressed by the uneven mold of the heated forming press device 24 to form the outer shape and perform heat treatment. Thereafter, the outer shape is punched and formed into the required annular shape by the outer shape cutting machine 26.

The edge 6 manufactured and processed by such a process is applied to the edge 6 by applying a silk screen method.
A super-polymer acrylic emulsion having weather resistance, which can transfer a resin in an annular shape to a base coating material on a surface of a stretchable base fabric 10 such as tetron, which has not been conventionally practicable. And a coating material 12 having excellent vibration damping properties formed thereon.
In addition to providing a good environmental effect to the edge 6, the back layer 13 can exhibit an excellent waterproofing effect because a pinhole hardly occurs. In addition, each of these layers 11, 12,
Since the overall thickness of the speaker 13 can be freely changed, and the thickness can be partially changed to enable precise adjustment of the resonance, the basic resonance frequency (f ₀ ) of the speaker can be easily adjusted. It is particularly effective for adjustment, and the coloring of the diaphragm and the edge can be freely classified.

At a low frequency, the diaphragm of the speaker 1 vibrates in phase with the entire surface of the diaphragm 5 in a so-called piston vibration as shown in FIG. 3, and the edge 6 also extends over the entire circumference. However, as shown in FIGS. 10 and 11, the diaphragm 5 generates concentric annular node-shaped vibrating nodes 28 due to the vibration, thereby generating divided node vibration of the diaphragm 5, and As shown in FIG. 12 and FIG.
8 may cause distortion noise at a high frequency where a split node vibration having a vibration antinode 29 in the middle is generated. 6 is a resonance force due to the unnecessary vibration transmitted to the outer periphery of the diaphragm 5 by vibrating softness and weight (density) of the second layer on the surface of the vibration damping material 12 centered on the ridge 6b. Is absorbed, and is prevented from being reflected inside the diaphragm 5, so that the speaker 1 can perform excellent sound reproduction without distortion.

The rubber latex coated as the vibration damping material 12 for damping the resonance force based on the weight constituting the edge 6 is inexpensive, has good weather resistance, and has a large vibration damping effect due to its flexibility. 14, 15, 16, 1 in the coating process applying
As shown in FIG. 7, since the stacking thickness can be adjusted, the suppressing force of the resonance force can be freely adjusted to a great extent, and the coating place can be selected to partially change the vibration damping state. Further, the thickness of the damping material layer 12 is changed in the circumferential direction on the annular surface of the edge 6 in a radial pattern, for example, in a mottled manner, so that the damping material layer 12 is coated only on a portion where edge resonance is likely to occur. Can be changed.

In Tables 1 to 5 showing the characteristics of the speaker,
The uppermost curve is the frequency characteristic on the axis, the second-stage curve is the frequency characteristic of the second harmonic, and the third-stage curve is
The frequency characteristic of the third harmonic and the lowermost curve show the impedance characteristic of the voice coil.

Table 1 shows the characteristics of a 16 cmφ speaker in which 110 g of a 1.5 m wide base cloth 10 impregnated with 5 g of a phenol resin was taken, and 60 g of rubber was coated thereon with a coating knife to attach a conventional edge. , F _{0 to} 20,000 Hz, the level difference of the frequency characteristics on the axis is 22 dB, and the impedance of the voice coil is 12Ω at the maximum. Further, since the weight of the diaphragm including the weight of the edge is large, the lowest resonance frequency f ₀ is 77.
46 Hz, which indicates that the average of the so-called mid-tone valley frequency is as small as 6 dB.

[0019]

[Table 1]

Table 2 shows the characteristics of the 16 cmφ speaker of the present invention in which the vibration damping layer 12 of rubber latex such as SBR, NBR, etc. was transfer-molded over the entire surface of the ridge-shaped projections 6b by the silk screen method to form the coating material 12 into a layer. And f
₀ is as low as 70.20 Hz, and the maximum and minimum level difference is 13d in the on-axis sound pressure frequency characteristic of f _{0 to} 20,000 Hz as compared with the conventional speaker shown in Table 1.
B, the voice coil impedance is up to 9Ω, and the midtone trough frequency is 5.5d.
B, indicating that the distortion of the middle tone is small, and that the characteristics of the speaker equipped with the edge 6 of the present invention are better than those of the speaker equipped with the edge of the conventional example. The effect of the edge 6 of the present invention is shown without regret.

[0021]

[Table 2]

Table 3 shows the structure in FIGS.
The characteristics of the speaker of the present invention of 16 cmφ in which the damping layer 12 of rubber latex such as SBR, NBR, etc. is transfer-molded in an annular shape by the silk screen method on the inside of the ridge-shaped protrusion 6b and the coating material 12 is formed as a layered layer 30, f ₀ is 77.46 Hz which is the same as in Table 1. However, as compared with the conventional speaker shown in Table 1, the maximum and minimum level difference in the on-axis sound pressure frequency characteristic of f _{0 to} 20,000 Hz is obtained. Is 16d
B, the impedance of the voice coil is a maximum of 8Ω, and the avalanche of the mid-tone valley frequency is as small as 5 dB, indicating that the distortion of the mid-tone is small, and the edge 6 of the present invention is attached. It shows that the characteristics of the loudspeaker obtained are better than those of the loudspeaker provided with the edge 6 'of the conventional example.

[0023]

[Table 3]

Table 4 shows the structure in FIGS.
A vibration damping layer 12 made of rubber latex such as SBR or NBR is coated on the entire surface of the annular surface of the edge 6 or the entire surface of the ridge-shaped protrusions 6b by a silk screen method so as to radially apply a coating in a circumferential pattern in a radial pattern. The characteristics of the speaker of the present invention having a diameter of 16 cm, on which the material layer 12 is transferred and formed, are shown. f
₀ is the same as 74.00 Hz as in Table 1, but Table 1
Compared with the conventional example of the _speaker, f 0 _~20,000Hz
In the on-axis sound pressure frequency characteristics, the maximum and minimum level difference is only 14.3 dB, the impedance of the voice coil is 9.5 Ω at the maximum, and the avalanche of the middle valley frequency is as small as 5 dB. This indicates that the distortion of the middle tone is small, and that the characteristics of the speaker equipped with the edge of the present invention are better than those of the conventional speaker equipped with the edge. The edge 6 according to the present invention is to change the vibration damping performance by changing the thickness of the annular surface by changing the thickness of the annular surface, for example, by coating only the portions that are likely to cause edge resonance. This is the edge 6 of the speaker diaphragm that can also be formed.

[0025]

[Table 4]

Table 5 shows the characteristics of a 16 cmφ speaker using an edge having the same structure as the edge of the embodiment of Table 2 when the base fabric 10 processed to a phenol resin impregnation concentration of 1% is used. Since the resin impregnation concentration of the base cloth is low, f ₀
Is as low as 64 Hz, the impedance of the voice coil is a maximum of 11Ω, and the maximum and minimum level difference is 1 in the on-axis sound pressure frequency characteristic of f _{0 to} 20,000 Hz.
It stops at 4 dB, and the avalanche of the mid-tone valley frequency is 5.0 dB, indicating that the distortion of the mid-tone is small.
The first harmonic distortion and the second harmonic distortion characteristics show that they are extremely good, and the effect of the edge of the present invention is regretted.

[0027]

[Table 5]

As described above, the edge of the diaphragm of the speaker of the present invention has a moderately large weight, a large thickness can be obtained, divided vibration is less likely to occur, distortion is small, and the speaker with the edge of the present invention is mounted. The characteristics can be selected freely according to the orientation of the loudspeaker, so that it is suitable for mass production of many kinds and uniformity of characteristics that could not be expected from the conventional loudspeaker equipped with an edge. Nature, weather resistance,
The effect of the edge of the present invention on water resistance, distortion characteristics, and the like is regretted.

Although the embodiments which are considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments, but has the above-mentioned constitutional requirements according to the present invention, and The present invention achieves the object of the present invention and can be appropriately modified and implemented within the range having the following effects.

[0030]

As is clear from the above description, since the edge 6 of the speaker diaphragm 5 of the present invention has the above-described structure, the material of the base cloth is elastic. Materials can be coated, the margin for punching out unnecessary parts is small, and the product yield rate is 60% or more, making a great contribution to reducing costs. Also, the part where unused parts are treated as industrial waste Since the amount is small and is left untreated, the environmental problem is reduced. That is, since the edge 6 of the speaker diaphragm 5 of the present invention has the structure as described above, the actual amount of the base fabric used is small, the material cost can be reduced, and the coating material required for processing is required. 11, 12, 13
Also, since the area is not the whole surface of the conventional buttery but only the necessary part, the usage amount is about one third of the conventional one. In addition, various coating materials can be properly used for each layer, and fine sound quality can be handled in accordance with the direction of use of the speaker 1. In addition, the diaphragm and the edge can be colored differently in various colors.

Since the ridge-shaped projections 6b can be formed directly in a continuous process after the coating materials 11, 12, and 13 are adhered, the vibration characteristics are uniformly stabilized, and the fundamental frequency (f ₀ ) of the speaker 1 is stable with little variation. As a result, the quality of the speaker 1 can be improved. Furthermore, since the respective layered coating materials 11, 12, and 13 have stable molecular structures and completed the reaction, there is no danger of generating pinholes, and aging can be ignored. Quality can be maintained.

In the speaker edge 6 of the present invention, the layered coating materials 11, 12, and 13 can easily change, correct and correct the elasticity (compliance) of vibration during the process. 6, the stiffness in the circumferential direction of the speaker 6 is partially changed consciously in accordance with the orientation of the speaker to suppress the resonance of the diaphragm 5,
Alternatively, the frequency characteristics of the speaker 1 can be changed by performing processing such as enhancing the resonance of the diaphragm 5. Furthermore, the base cloth 10 of the edge 6 of the speaker diaphragm 1 of the present invention can be freely selected and adopted, and is a base cloth that can withstand a large input (large amplitude) and has a characteristic that the fundamental frequency (f ₀ ) does not decrease. It is possible to expect the effect of freely selecting and easily using a base fabric corresponding to various uses such as a cloth or an elastic cloth material.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a speaker.

FIG. 2 is a half sectional view of the speaker of FIG. 1;

FIG. 3 is a quarter sectional view of the speaker of FIG. 1;

FIG. 4 is an external view of an edge.

5 is an enlarged cross-sectional view showing the structure of the edge of the present invention indicated by a dashed-dotted circle in FIG. 4;

FIG. 6 is a schematic view showing a process of manufacturing an edge according to a conventional example.

FIG. 7 is a schematic diagram showing a processing example of a conventional edge fabric.

FIG. 8 is a schematic diagram showing a manufacturing process of the edge of the present invention, and a schematic diagram showing a cross section at each stage.

FIG. 9 is a schematic view showing a processing mode of the edge base fabric of the present invention.

FIG. 10 is a plan view showing a nodal vibration of a diaphragm of the speaker.

11 is a diagram showing a cross section of a nodal circle vibration of the diaphragm of the speaker of FIG. 9;

FIG. 12 is a plan view showing divided node vibration of the diaphragm of the speaker.

FIG. 13 is a diagram showing a cross section of a divided node vibration of the diaphragm of the speaker of FIG. 12;

FIG. 14 is a diagram showing a cross-section of a speaker according to the fourth invention, which is provided with an edge formed by forming a coating material by forming a damping layer in a ring shape inside a ridge-shaped protrusion of the edge.

FIG. 15 is a plan view of the speaker in FIG. 14;

FIG. 16 is a diagram showing a fourth embodiment of the present invention, in which a damping layer is transferred and formed on the entire surface of the ridge-shaped protrusions of the edge or on the entire surface of the ridge-shaped protrusions in a radial manner in a circumferential pattern. FIG. 4 is a diagram showing a cross section of a speaker to which a fitted edge is attached.

FIG. 17 is a plan view of the speaker in FIG. 16;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Speaker 2 Magnetic circuit 2a Magnet 2b Toroidal magnetic gap 3 Voice coil 3a Voice coil bobbin 4 Damper 5 Diaphragm 6 Edge 6 'Conventional edge 6a Inner glue margin 6b Rib-shaped protrusion 6c Outer glue margin 7 Frame 8 Projection REFERENCE SIGNS LIST 9 recessed portion 10 base cloth 11 weather-resistant coating material layer 12 vibration-damping coating material layer 13 waterproof coating material layer 14 hot-melt adhesive 15 adhesive 16 punching slag 17 coating resin 18 coating knife 19 support stand 20 weather-resistant surface Single layer stamper 21 Stamper for vibration damping material 22 Stamper for waterproof layer 23 Stamper for applying adhesive 24 Molding press device 24 ′ Conventional molding press device 25 Heating wire for heating 26 Outline cutting machine 27 Heating device (dryer) 28 Vibration node 29 Vibration antinode 30 Transfer molding to ring Coating damping material layer transferred radially formed mottled wind coating material layer 31 circumferentially Te

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinya Mizone 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Shinsaku 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial (72) Inventor Nobuo Nakamura 1006 Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Shio Sone 6-8-16 Minami Kasugaoka, Ibaraki-shi, Osaka F-term (reference) CA02 EC03 FA01 GA01 HA02

Claims (6)

[Claims] An outer surface of a woven fabric (10) serving as a base fabric is coated with a waterproof resin (13) in an annular shape by a screen printing means so that a certain amount of fiber is coated inside the woven fabric (10). By embedding and filling to a depth, a layer is formed as a back layer (13), and the outer surface of the base fabric (10) is coated with another different weather-resistant resin in an annular shape by similar means to form a front surface. The first layer (11) is laminated, and on top of that, another vibration damping synthetic resin is annularly coated by the same means as above, and the surface second layer (12) is laminated. Edge of speaker diaphragm. 2. An edge (6) of the diaphragm for a loudspeaker according to claim 1, wherein an inner surface and an outer surface of the waterproof back layer (13), an outer periphery of the diaphragm (5) and a loudspeaker frame. 2. The edge of the speaker diaphragm according to claim 1, wherein the outer periphery of the diaphragm is provided with a heat sealing adhesive (14) for bonding. 3. The loudspeaker diaphragm according to claim 1, wherein an olefin resin blended with water-resistant fluorinated on the back surface layer is provided at the edge of the loudspeaker diaphragm according to claim 1. )
The edge of the speaker diaphragm according to claim 1, wherein an acrylic resin is used for the second layer, and SBR is used for the vibration-damping surface second layer (12). 4. The vibration-damping surface second layer (12) at the edge (6) of the loudspeaker diaphragm according to claim 1, wherein the thickness of the vibration-damping surface second layer (12) is superficially and partially changed. The edge of the diaphragm for a speaker according to claim 1, wherein the vibration damping performance is partially changed by laminating. 5. The loudspeaker diaphragm according to claim 1, wherein the edge (6) of the loudspeaker diaphragm according to claim 1 is a 30-460 mesh tetron obtained by processing a woven fabric (10) with a phenol resin. Board edge. 6. The weather resistance of an ultra high molecular weight acrylic emulsion having a thixotropy imparted in an annular shape by applying screen printing means to the upper surface of a woven fabric to be a base fabric (10) spread by applying tension. The first layer (11) is formed by transferring the basic coating material, and a coating material for damping the resonance force of rubber latex such as SBR and NBR is transferred onto the first layer (11) in a ring shape by the same screen printing method. And the second layer (1
2), and, on the entire lower surface of the back side of the base fabric (10), in an annular shape by a silk screen method, a back surface layer (13) of a filling coating material that retains a waterproof function of the olefin resin.
Further, a waterproof structure composed of a hot-melt adhesive (14) and an adhesive (15) are respectively formed on the lower surface outer peripheral portion and the inner peripheral portion of the back surface layer (13), and after the heat treatment, the inner adhesive paste is formed. Forming (6a), ridge-shaped projections (6b), and outer pasting paste allowance (6c) with a molding press machine (24), and punching and molding the outer shape into the required annular shape using an outer shape cutting machine (26). A method of manufacturing an edge (6) of a diaphragm for a speaker, characterized by comprising: