JP3241514B2 - Method for manufacturing speaker vibration member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration member for a loudspeaker, which is a part for generating sound by vibrating air, and a method of manufacturing the vibration member.

[0002]

2. Description of the Related Art A diaphragm as a vibration member for a speaker is a member that generates sound by vibrating air, and includes a cone type, a dome type and a flat type. An ideal diaphragm material is required to have three conditions of being hard and light, and having a large internal loss. The edge for elastically supporting the peripheral portion of the diaphragm on the frame is formed of an elastic body.

[0003] As the material, a material obtained by impregnating a cloth with a resin and heat-molding, a material obtained by molding a rubber, a material obtained by heating a plastic sheet, and a material obtained by heating a foamed plastic sheet are used.

A diaphragm elastically supported on a frame by such an edge is used, for example, in a dynamic speaker as shown in FIG. That is, a magnetic circuit is constituted by the back plate 1 having the pole piece 2 at the center, the magnet 3 and the plate 4 placed on the back plate 1. A voice coil bobbin 6 supported by a damper 7 is inserted into a magnetic gap provided between the plate 4 and the pole piece 2.

The voice coil 5 wound around the voice coil bobbin 6 is connected to the diaphragm 8. Diaphragm 8
Is attached to the frame 11 via the edge 10. A center cap 9 is attached to the center of the diaphragm 8.

In such a configuration, when a voice signal is supplied to the voice coil 5, the voice coil bobbin 6 moves up and down in the magnetic gap due to the reaction of the magnetic flux with the magnet 3, and the sound wave is generated by the vibration of the diaphragm 8. Released. At this time, the vibrating plate 8 in the high-tone range causes each part to vibrate separately, that is, a divided vibration. In the bass range, the edge 10 is deformed, and the diaphragm 8 vibrates integrally.

Incidentally, as a process for manufacturing such a diaphragm 8, firstly, there is a process for producing a papermaking raw material, secondly, a papermaking process, thirdly, a molding / drying process, and fourthly, a moisture-proof treatment. Post-processing, 5th machining, and edge 1
There is a sticking step of zero.

[0008] In order to produce the papermaking raw material of the first step, pulp, bast fiber, synthetic fiber and the like as raw materials are dispersed in water,
Beat with beater. The beater has a fixed blade and a rotary blade, and cuts or grinds the fiber.

This adjustment is made based on the degree of contact with the blade and the beating time, and it may take ten minutes for a short blade and several tens of hours for a long blade. Generally, several types of raw materials are mixed and used, but there are also two mixing methods, one is to beater each raw material and then mixing, and the other is to mix the raw materials from the beginning or in the middle. And beater together. The finished raw material is dyed as necessary to complete the papermaking raw material.

When the papermaking raw material is completed, papermaking is performed by a paper machine as a second step. 2. Description of the Related Art Papermaking machines include a papermaking die made of a cone-shaped punching net or a wire mesh, which is made by making papermaking materials diluted with water. The method of paper making varies widely. If the fiber adhering to the papermaking mold is dried as it is in the third step, a corn prototype is completed.

There are many types of drying processes, such as transferring from a papermaking mold to another drying mold, suctioning with a vacuum pump, and forming and drying while pressing with a metal mold, and the effect on performance is delicate. .

When the original shape of the cone is completed, the process proceeds to a fourth step, in which lacquer, latex, or the like is impregnated or applied to adjust the moisture resistance and the cone physical constant.

This process may be performed after the fifth and sixth steps. The fifth step is the cutting of the cone neck and the outer periphery of the cone. Finally, the cone is completed by attaching the cone edge.

FIG. 2 shows a diaphragm manufactured by the above process, which is called a so-called free edge cone. Are adhered by an adhesive 15. In the free edge cone having such a configuration, a particularly soft material is used for the edge 10 and the damper 7 in order to facilitate movement of the diaphragm 8. In addition, the code | symbol 16 in a figure has shown packing.

[0015]

As described above, in the above-described conventional dynamic speaker, the diaphragm 8 and the edge 10 are separately formed, and finally, both are fixed by the adhesive 15.

Therefore, when it is desired to use heat-resistant silicone rubber or the like as the edge 10, not only is it difficult to adhere, but also the diaphragm 8 and the edge 10 are separately formed, and finally, both are formed. Because of the bonding, there was a problem that the number of assembly steps was increased.

Furthermore, since the diaphragm 8 and the edge 10 are separate bodies and are finally integrated by bonding, vibration is disturbed by the boundary between the diaphragm 8 and the edge 10 when vibrating. However, there is a problem that the acoustic characteristics are deteriorated.

By the way, as shown in FIG. 3, in a so-called fixed edge cone, the edge 10 portion is integrally formed with the cone paper, and the diaphragm 8 and the edge 10 are separately formed. Since there is no need for molding, there are advantages such as simplification of the manufacturing process. However, in terms of the ease of movement of the diaphragm 8, it is slightly inferior to the free edge cone.

The present invention has been made in view of such circumstances, and has as its object to provide a speaker vibration member capable of reducing the number of assembly steps and improving acoustic characteristics, and a method of manufacturing the same. .

[0020]

SUMMARY OF THE INVENTION Vibration for a speaker according to the present invention
The method of manufacturing the member is to form the base body into a cone shape,
Set the base and rubber block between the molds and
Rubber formed by heat molding on one side of the base
The body is integrated, and the edge is formed during heat molding of the rubber body.
It is characterized by being formed integrally with the rubber body .

[0021]

[0022]

The vibration member for a speaker according to the present invention integrates the rubber body by heat molding over the entire surface of one side of the base body formed into a cone shape, and integrates the edges during the heat molding of the rubber body. This eliminates the need for a step of separately forming the diaphragm and the edge and bonding the two together as in the past, which not only reduces the number of assembling steps, but also results in disturbance of vibration due to the integration of the two. No deterioration occurs in the acoustic characteristics without the occurrence of noise.

The speaker vibration member of the present invention is based on a natural material such as wood pulp from which a material can be selected relatively freely, and is melted at a temperature lower than the vulcanization temperature of rubber described later. Shortcut fiber or pulp of thermoplastic resin is blended, vulcanized and integrated in a molten state, and the integrated member further increases the internal loss compared to the internal loss of paper or rubber alone. .

As natural fibers, fibers such as cotton linter and kapok can be used in addition to BKP, BSP, UKP and USP made from general wood pulp. Also, bast fibers and the like can be used.

Mp (melting point) is 120 ° C.
As the synthetic fiber at -170 ° C, for example, cut fiber of acrylic fiber, cut fiber of polyethylene fiber, and so-called synthetic pulp which is also high-density polyethylene pulp can be used.

The cut length of the fiber is not particularly limited, but is preferably about 1 to 3 mm for good dispersion.

As rubber, typical SBR, NBR,
Butyl and the like can be used. Of course, it is a rubber generally used, and contains a vulcanizing agent, a vulcanization accelerator, a dispersant, and a stabilizer.

[0028]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a speaker vibration member and a method of manufacturing the same according to the present invention. In the drawings described below, portions common to FIG. 1 are denoted by the same reference numerals and described.

FIG. 4 shows an embodiment of a speaker vibrating member according to the present invention. The diaphragm 8 includes a base member 8a formed by short-cut fiber of synthetic fiber or fibrillated fiber. The base body 8a is composed of a roughly kneaded rubber body 8b of SBR, NBR, butyl or the like. An edge 10 of the same material is formed integrally with the rubber body 8b. In addition, the code | symbol 16 in a figure has shown packing.

FIG. 5 shows another embodiment in which the configuration of the speaker vibration member is changed, and the mounting position of the rubber member 8b with respect to the base member 8a is reversed.

FIG. 6 schematically shows a manufacturing process of the speaker vibration member. As shown in FIG. 6A, in the case of paper making, the outer diameter is first trimmed. In this case, the paper may be impregnated with a resin and cured. After the base body 8a whose outer diameter has been trimmed is set between the upper mold and the lower mold, an unvulcanized rubber block is placed on the base body 8a.

On the other hand, as shown in FIG. 2B, similarly, in the case of the cross prepreg, the outer diameter is first trimmed, and then set between the upper mold and the lower mold, and further, the uncured Is placed on the base body 8a.

Next, a specific example of a method for manufacturing a speaker vibration member will be described.

Comparative Example (1) Softwood bleached kraft pulp (NBKP) was beaten (by brushing beating) with beading so as not to impair the fiber form, and beaten with a Canadian freeness tester to a beating degree of 710 ml. This is dispersed in water. Next, this suspension is formed into a paper net having a predetermined shape of the base body 8a, and is press-dried with a mold. The drying temperature at this time is 180 ° C.

Comparative Example (2) 20 wt% of high-density polyethylene pulp is blended with the raw material of Comparative Example (1), and the paper is similarly formed with a predetermined base body 8a in the form of a paper net, and dried with a mold. The drying temperature at this time is 180 ° C. Therefore, in this example, the high-density polyethylene pulp is once in a molten state and is heat-sealed.

Comparative Example (3) 40 wt% of high-density polyethylene pulp was blended with the raw material of Comparative Example (1), and a predetermined base body 8a was formed in the same manner as in Comparative Examples (1) and (2). The paper is made with a net and press-dried in a mold. The drying temperature at this time is 180 ° C. Therefore, also in this example, the high-density polyethylene pulp is in a molten state once and heat-sealed. However, 40wt
%, The mold is fused to the mold.
Removed after cooling to 0 ° C.

Comparative Example (4) In place of the high-density polyethylene pulp of Comparative Example (2), cut fibers of acrylic fiber were blended in an amount of 20% by weight, and similarly, a paper was formed through a paper net having a predetermined base body shape, and a mold was formed. And press dry. The drying temperature at this time is 180 ° C.
The acrylic fiber used in this example has a cut length of 5 mm and m
p 150 ° C. Therefore, also in this case, it is in a molten state once and heat-sealed.

Comparative Example (5) Instead of the high-density polyethylene pulp of Comparative Example (2), 20% by weight of a cut fiber of a polypropylene fiber was blended, and similarly, a paper was formed through a paper net having a predetermined shape of a base body, and a metal mold was used. Press dry. The drying temperature at this time is 180 ° C. The polypropylene fiber used in this example has a cut length of 5 mm and an mp of 190 ° C. Therefore, in this case, the fibers remain in a fibrous state without melting.

Comparative Example (6) A cotton linter was used in place of NBKP of Comparative Example (1). Perform brushing beating in the same manner, with a beating degree of 750.
ml. A cotton linter is dispersed in water, and the lint is similarly formed through a paper net having a predetermined base body shape, followed by press drying with a mold. The drying temperature at this time is 180 ° C.

Comparative Example (7) Kabok is used in place of NBKP of Comparative Example (1). In this case, free beating is performed to cut the fiber.
The degree of beating is 640 ml. The kabok is dispersed in water, made into a paper with a predetermined base body in the same manner, and dried by pressing in a mold. The drying temperature at this time is 180 ° C. Next, adjust the rubber. As the base rubber, butyl rubber is used. 8
4.9 wt%, DM 0.5 to 3.8 as vulcanization accelerator
wt% and fully cured.

Example (1) The above-prepared butyl rubber is placed on the comparative example (1), and heated and pressed by a mold having a predetermined shape. Pressure is 40kg / c
m ² , vulcanization temperature 180 ° C., vulcanization time is 8 minutes. Example (2) In the paper making process of Comparative Example (2), the press drying temperature was set to 12
This is performed at 0 ° C. to produce the base body 8a without melting the high-density polyethylene pulp and leaving the fiber form. The butyl rubber adjusted as described above is placed thereon, and heated and pressed with a mold having a predetermined shape. The pressure is 40 kg / cm ² , the vulcanization temperature is 180 ° C., and the vulcanization time is 8 minutes.

Example (3) In the paper making process of Comparative Example (3), the press drying temperature was set to 12
This is performed at 0 ° C. to produce the base body 8a without melting the high-density polyethylene pulp and leaving the fiber form. The butyl rubber thus adjusted is placed thereon, and heated and pressed by a mold having a predetermined shape. The pressure is 40 kg / cm ² , the vulcanization temperature is 180 ° C., and the vulcanization time is 8 minutes.

Example (4) In the paper making process of Comparative Example (4), the press drying temperature was set to 14
The process is performed at 0 ° C., and the base body 8a is prepared without melting the cut fiber of the acrylic fiber and keeping the fiber form. The butyl rubber thus adjusted is placed on this, and heated and pressed with a mold having a predetermined shape. Pressure is 40kg / cm
^{2. The} vulcanization temperature is 180 ° C and the vulcanization time is 8 minutes.

Example (5) The above-prepared butyl rubber was placed on Comparative Example (5), and heated and pressed with a mold having a predetermined shape. Pressure is 40kg / c
m ² , vulcanization temperature 180 ° C., vulcanization time is 8 minutes. In this case, since the polypropylene fiber was not melted from the beginning, it was carried out in the sense of comparison between the case where it was melted and the case where it was not melted.

Example (6) The above-prepared butyl rubber was placed on Comparative Example (6), and heated and pressed with a mold having a predetermined shape. Pressure is 40kg / c
m ² , vulcanization temperature 180 ° C., vulcanization time is 8 minutes.

Example (7) The above-prepared butyl rubber was placed on Comparative Example (7), and heated and pressed by a mold having a predetermined shape. Pressure is 40kg / c
m ² , vulcanization temperature 180 ° C., vulcanization time is 8 minutes.

Example (8) The same combination as in Example (2), but with the rubber down
The test was performed with the diaphragm serving as a base facing upward.

Example (9) For example, 30% by weight of Kepler's short fiber, 40% by weight of Conex's short fiber, and 30% by weight of a pulp of Conex are also blended and formed into a paper. Further, 20 wt% of a phenol resin was adhered to this,
Let cure for 0 minutes. Silicon rubber was integrated with this to create an edge. In this case, heat resistance is improved.

Example (10) For example, pitch-based carbon fiber SF 50A 105
After 50 wt% of an unsaturated polyester resin was adhered to a (105 g / cm ² ) carbon cloth (plain weave), curing of the unsaturated polyester resin and vulcanization of the rubber were simultaneously performed. The curing in this case is 170 ° C. for 8 minutes.

Example (11) The longitudinal and weft yarns of the carbon cloth in Example (10) were alternately replaced with glass cloth. In this case, the deformation of the cone including the embodiments (9) and (10) is reduced. Next, these physical properties are shown in Table 1.

[Table 1]

From the above results, although the level of the internal loss is slightly different depending on the type of the base natural fiber,
It is clear that the internal loss increases when the thermoplastic resin fibers are blended. Also, just because the thermoplastic resin fibers are blended, those whose mp is higher than the vulcanization temperature, that is, those that do not melt during vulcanization have a low effect, and when the thermoplastic resin fibers are not blended, It can be seen that there is not much difference from the case where only natural fibers are used.

Further, it can be understood that the effect of the vulcanization differs depending on the positional relationship between the base body 8a and the rubber body 8b, that is, when the rubber body 8b is raised and lowered.

As described above, in this embodiment, the resonance of the diaphragm for the speaker can be suppressed by increasing the internal loss, and the Young's modulus is also increased as shown in the physical properties. . Of course, this is due to the balance between the base paper and the rubber, in other words, a wide range of physical properties can be selected.

Therefore, the present invention may be applied not only to the diaphragm and the edge, but also to other speaker components that affect the sound pressure frequency characteristics, such as a damper, as well as the base body and the soft dome.

[0055]

As described above, according to the vibration member for a speaker and the method of manufacturing the same according to the present invention, the rubber body is integrated by heat molding over the entire surface of the cone-shaped base body. The edges are integrated during the heat molding of this rubber body, eliminating the need for the process of separately forming the diaphragm and the edge and bonding the two at the end, as in the past, reducing the number of assembly steps. In addition, the integration of the two prevents the disturbance of the vibration and prevents the deterioration of the acoustic characteristics.

The base material is a natural material such as wood pulp from which the material can be selected relatively freely, and a short cut fiber or pulp of a thermoplastic resin which melts at a temperature lower than the vulcanization temperature of rubber is blended with the base material. And vulcanized and integrated at the same time as a molten state.The integrated member further increases the internal loss compared to the internal loss of paper or rubber alone, so the resonance frequency is lowered,
The effect on the sound pressure frequency characteristics can be eliminated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a conventional dynamic speaker.

FIG. 2 is a sectional view showing the diaphragm shown in FIG. 1;

FIG. 3 is a sectional view showing another conventional diaphragm.

FIG. 4 is a sectional view showing a diaphragm according to an embodiment of the speaker vibration member of the present invention.

FIG. 5 is a sectional view showing another embodiment in which the configuration of the diaphragm shown in FIG. 4 is changed.

FIG. 6 is a diagram showing a method of manufacturing the diaphragm shown in FIGS. 4 and 5;

[Explanation of symbols]

 8 diaphragm 8a base body 8b rubber body 10 edge

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Haruhiro Kato Yamano Prefecture Mogami-gun Mamurogawa-cho Omachi Shinmachi character Shiono 954-1 Mogami Denki Co., Ltd. (57) Fields investigated (Int. Cl. ⁷ , DB name) H04R 7/02 B32B 25/10 H04R 7/18 H04R 31/00

Claims (1)

(57) [Claims] 1. A base body is formed into a cone shape, and
A scan body and the rubber block is set between the mold integrating a rubber member by heating the molding over the entire on one side of the base body, that the edge is formed integrally with the rubber member during heat molding of the rubber body A method for manufacturing a speaker vibration member, comprising: