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JPS58119298

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DESCRIPTION JPS58119298
[0001]
The present invention relates to the improvement of a speaker diaphragm. Fig. 1 shows an
example of the configuration of traffic. The symbols in the figure indicate 1, diaphragm 2, voice
coil bobbin 3, voice coil 4, adhesive. In the past, adhesion of the diaphragm to the voice coil
bobbin and bonding of the voice coil bobbin to the voice coil were made only of resin
components such as thermosetting resin or thermoplastic resin. Adhesion with only the above
resin component has the following drawbacks. (A) The diaphragms 1 and 2, and the voice coil
bobbin are mainly made of fiber material. 4 The adhesive 4 is permeated and absorbed by the
fibers if the adhesive is only a resin component, and the bonding effect is lowered. . (B) 1, the
diaphragm 2 and the voice coil bobbin's fibers 4 penetrated by the adhesive jig, the adhesive jig
is inserted inside, the parts 12 and 13 of the jig 1 and 2, the diaphragm 1 and 2, Bonding the
voice coil bobbin makes it difficult to remove from the jig 11. Ha, the biggest difficulty is 3, heat
generation by Joule heat when energizing the voice coil 4, that the adhesive is softened and the
adhesive strength is reduced, 4, the thermal conductivity of the adhesive is low, 3, voice coil
Since the ability to dissipate the heat generated by the voice coil is high, the adhesive softens at
high temperature. Therefore, the present invention aims to improve the above problems. FIG. 2
will be described below. FIG. 2 shows an example, and symbols in the figure show 1, vibrating
plate 2, voice coil bobbin 3, voice coil 4, adhesive agent 5, fine powder of metal. That is, the
addition of a fine powder of metal 5 into the adhesive 4 is novel. 4. When the metal fine powder
is mixed in the adhesive 5, as shown in FIG. 3, the adhesive 4 surrounds the surrounding of the
metal fine powder 5. Therefore, the effect of using the 2 voice coil bobbins made of fibrous
materials, 3, the voice coil 2, the voice coil bobbin and 1, the adhesion of the present invention 5
of the present invention, the adhesive 4 mixed with fine metal powder Explain. Fig. 4 is an
enlarged view of the cross section of 1, 4 adhesive mixed with fine metal powder of the present
invention, 1 bonding plate, 2 voice coil bobbin, 2 voice coil bobbin and 3 voice coil. The symbol 6
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in the figure indicates the opening between the fibers of the fibrous 1 diaphragm 2 and the voice
coil bobbin (hereinafter referred to as the opening). When bonding is performed using an
adhesive 4 mixed with metal fine powder 5, as shown in FIG. 4, 5, the metal fine powder is 3, 3
voice coils, 3 voice coils and 2, 2 voice coil bobbins. Scattered in gap 7,.
The fine metal powder in this gap has the following effects. (A) The opening of the fiber, 6, 5, the
fine metal powder is closed, 4, the adhesive is 2, and the voice coil bobbin is difficult to be
absorbed. (B) 5, fine metal powder directly opens the opening, 6 even without blocking 5, the
adhesive 4 on the surface of the fine metal powder by surface tension, to the fibrous opening
more than necessary 4, Prevents the adhesive from being absorbed. The item a), 2 above, fixes
the voice coil bobbin with the jig 11 inserted inside, the surface 8 and the adhesive 4 permeating
the side, and improves the point where removal was difficult. (C) Increase the adhesive strength.
The disadvantages of bonding the two voice coil bobbins and the three voice coils by using only
the adhesive 4 which does not mix fine metal powder immediately as shown in FIG. The fiber 6 at
the bonding portion, the adhesive 4 absorbed and absorbed from the opening to the back surface
8 to the side was removed from the gap 7, air bubbles and cavities remained in the gap 7, and
the adhesion was reduced. On the other hand, in the present invention 5, the metal powder is
adhered with an adhesive mixed. As shown in Fig. 4, 7, the fine metal powder is scattered in the
gaps 5, and as described in the sections a and b above 4, the adhesive is penetrated and absorbed
through the opening more than necessary. Prevention 7, In the gap 4, No air bubbles or voids
due to lack of adhesive. Therefore, it has high adhesion to compression and tension
accompanying deformation and the like. (D) By mixing the metal powder with the adhesive 4, the
thermal conductivity of the adhesive layer (the mixed layer of the adhesive and the metal powder
with 5) is increased, and the temperature rise of the voice coil 3 is reduced. Do. Therefore, 4, the
adhesive is not exposed to high temperature and the decrease in adhesion is reduced. That is, in
FIG. 4, 3, heat dissipation of the voice coil is conducted through 4, an adhesive and 5, fine metal
powder. In the case of adhesion (shown in Fig. 5) 5, adhesion using only the adhesive dissipates
heat 4 through only the adhesive. If the thickness of the adhesive layer is substantially equal to
that of the reference example Fig. 5 and the present invention, Fig. 4 the metal fine powder is
much higher in thermal conductivity than the adhesive agent Is big. 3. The amount of heat
generated by the voice coil is the same for both the prior art shown in FIG. 5 and the present
invention shown in FIG. 4 In the present invention having a large heat radiation capacity, the
temperature rise of the voice coil is lower than the prior art shown in FIG. It is not exposed to
high temperatures and can maintain adhesion. Bonding of the two voice coil bobbins and the
three voice coils is mainly described, but in FIG. 4, the bonding between the one diaphragm and
the two voice coil bobbins is also described in (a) and (b). There is an effect of
That is, 5, fine metal powder is mixed in 2, voice coil bobbin made of fibrous material, 1, adhesive
4 of diaphragm, and so on. 5, fine metal powder blocks the fibrous opening 6, and by surface
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2
tension, holds the adhesive 4 on its surface and keeps the adhesive 4 on the adhesive surface.
This effect is particularly remarkable when the material of the voice coil bobbin is made of paper
or the like that can easily absorb the adhesive 4. The particle size of the fine metal powder mixed
with the adhesive 4 is desirably about half or less of the wire diameter of the third voice coil, as
can be seen from FIG. This is because if the grain size is too large, it interferes with the close
contact between the three voice coils, the voice coil and the two voice coil bobbins. Also, the
metal fine powder is in contact with the voice coil and is nonmagnetic in order not to disturb the
magnetic field generated by energizing the voice coil, and vibration of the diaphragm (several
tens to several thousands of hertz) In order to reduce the specific gravity and to improve the heat
dissipation of the voice coil, it is desirable to have a high thermal conductivity. Considering these
three non-magnetic, light weight, and high thermal conductivity, aluminum almost meets the
purpose. Next to this is non-metallic carbon. Also, carbon is softer than aluminum powder, and as
shown in FIG. 2 and FIG. 4, even if it is mixed with an adhesive 4 and 3 and pressed against a
voice coil, the insulating layer on the coil surface is not damaged. As described above, the fine
metal powder 5, as shown in FIGS. 2 and 4, is light, high thermal conductivity material, and
nonmagnetic. In addition, the mixing ratio of the fine metal powder mixed with the adhesive 4 is
5 to 30% by weight, which has a higher effect. As described above, a diaphragm for a speaker
having a large heat radiation and a high strength of the bonding portion was obtained by using 5,
an metal fine powder and an adhesive. Also, even in the case of using a voice coil bobbin out of
fiber, it is possible to obtain a speaker diaphragm having high strength of both heat radiation and
adhesion by using an adhesive 5 mixed with metal fine powder 4 .
[0002]
Brief description of the drawings
[0003]
The first figure is a cross-sectional view in which 1, a speaker diaphragm, 2, a voice coil bobbin,
3, a voice coil 4, and an adhesive bond in the conventional example.
(Symbol 11, jig) FIG. 2 is a cross-sectional view in which 5, the fine metal powder of the present
invention 4 is mixed with an adhesive and 1 the diaphragm 2, the voice coil bobbin 3 and the
voice coil are adhered. FIG. 3 is a cross-sectional view in which 5, the adhesive adheres to the
surface of fine metal powder 4 by surface tension. FIG. 4 is an enlarged cross-sectional view of
the bonding portion of the present invention.
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