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JPH0678393

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0678393
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker in which a film is integrally formed on, for example, a diaphragm body
portion, an edge portion and a gasket portion constituting a diaphragm for a speaker.
[0002]
2. Description of the Related Art A speaker diaphragm is a portion that vibrates air at the front of
a speaker to produce sound, and is an ideal diaphragm material that is hard, light, and has
adequate internal loss. Required
[0003]
FIG. 1 shows a cone shape as an example of such a speaker diaphragm, and an edge portion 2 is
bonded to the outer peripheral edge portion of the diaphragm body portion 1.
Between the outer peripheral edge of the diaphragm body 1 and the edge portion 2, a reinforced
bonding portion 4 is provided. Furthermore, the gasket portion 3 is bonded to the outer
peripheral edge portion of the edge portion 2. Such types are commonly referred to as free edge
cones.
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[0004]
In addition to this, the diaphragm body 1 and the edge portion 2 may be integrally formed by
papermaking, and such a type is generally called a fixed cone.
[0005]
By the way, for Hi-Fi, free edge cones are often used because the material of each component
constituting the speaker diaphragm can be arbitrarily set, and these materials are used properly
depending on the application of the speaker .
[0006]
As the diaphragm material of the speaker, although it is possible to use metal, a plastic composite
material, or many other materials for the diaphragm body portion 1, generally, appropriate
physical property values, ease of processability, and low cost From the above, the papermaking
of wood pulp fibers is most frequently used.
As the material of the edge portion 2, molded articles such as cotton woven fabric and urethane
foam are used.
As a material of the gasket part 3, what punched out the arrow paper of thickness about 0.5-3
mm to a predetermined dimension is used in many cases.
[0007]
Such a speaker diaphragm is manufactured as follows. For example, in the case of a free edge
cone, a diaphragm body 1 made of paper, for example, an edge 2 of a predetermined shape
formed by heating and pressure forming a resin coated woven fabric, a gasket 3 of a
predetermined shape with a desired thickness On the other hand, the adhesive is activated and
adhered by applying an adhesive to each joint and heating and pressing with a mold having a
predetermined shape.
[0008]
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After that, an adhesive such as a rubber is applied to a joint portion between the outer peripheral
edge portion of the diaphragm body portion 1 and the edge portion 2 through a needle hole
having a diameter of about 1 mm, and reinforced and adhered. That is, in the case of operating as
a speaker diaphragm, the strength of these adhesive surfaces occupies most of the reliability, so
the required performance for the adhesive force is severe.
[0009]
However, in the case of the diaphragm body 1 of the above-described conventional diaphragm
for a speaker, it is poor in water resistance, moisture resistance and quality stability because it is
made of wood pulp fibers. In a severe use environment such as for automobile loading, there was
a problem in durability. In addition, since wood pulp fibers are air-permeable because they are
porous systems, it was necessary to apply a sealing treatment by various resin impregnation or
the like.
[0010]
In the case of the edge portion 2, if the edge portion is made thinner in order to lower the lowest
resonance frequency (F0), air leakage from this thinned portion will increase and not only the
performance will be deteriorated, but also the F0 value The frequency characteristics are also
adversely affected due to variations and the like.
[0011]
Although the reliability of adhesion is improved with respect to the reinforced adhesion portion 4
provided between the diaphragm body 1 and the edge portion 2, the adhesion portion becomes
hard, which also causes the generation of a rattling noise and the like.
Therefore, there is a demand to increase the reliability of adhesion after eliminating such
adhesion processing.
[0012]
The present invention has been made to cope with such a situation, and a diaphragm for a
speaker capable of improving performance by integrally applying a film to each component
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constituting the diaphragm. Intended to be provided.
[0013]
The invention according to claim 1 is characterized in that a film is integrally applied to at least
the main surface of each component constituting the diaphragm.
[0014]
The invention according to claim 2 is characterized in that the film is applied by coating.
[0015]
The invention according to claim 3 is characterized in that the paint used for the coating is a onefiller type or a high solid type.
[0016]
The invention according to claim 4 is characterized in that the film is composed of a heat-fusible
film.
[0017]
In the speaker diaphragm of the present invention, since the film is integrally applied to at least
the main surface of each component constituting the diaphragm, water resistance and moisture
resistance can be imparted to each component. In addition, the bonding strength of each
component can be improved, and the minimum resonance frequency can be improved.
[0018]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be
described in detail with reference to the drawings.
In the drawings described below, the same parts as those in FIG.
[0019]
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FIG. 2 shows one embodiment of the speaker diaphragm of the present invention, in which the
diaphragm body 1, the edge portion 2 and the gasket portion 3 constituting the speaker
diaphragm are fixed to each other.
The film part 5 is integrally arrange | positioned by the whole main surface of each component.
The film portion 5 is disposed by coating or sticking of a film.
[0020]
FIG. 3 is an enlarged view of a cross section of the film portion 5, and the filler 7 and the wood
pulp fiber 6 are disposed inside the film 8.
Incidentally, in the case of the high solid type paint or the film adhesion, the filler 7 is not
included from now.
[0021]
The speaker diaphragm of such a configuration is manufactured as follows.
Example 1 The beet is beaten on UKP (softwood unbleached kraft pulp).
In contrast to the diaphragm constituted by bonding of the diaphragm body 1 by papermaking,
the edge portion 2 by molding of a resin-coated cotton cloth, and the gasket portion 3 with a
thickness of 0.5 mm, adjusted to a beating degree of about 20 ° SR. For example, a two-part
curable urethane paint containing about 20% of SiO2 and Al2O3 as a filler and having a viscosity
of about A1 to A2 (according to a Gardner viscometer) from the gasket part 3 to the edge part 2
to the diaphragm body 1 After spraying with a spray gun, it was dried and cured at about 80 °
C. for about 30 minutes to form a coating 5 having a film thickness of about 50 μm.
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[0022]
The filler 7 is not limited to these, and may be of another type such as BaSO4, CaCO3, Mg0.Si02,
or may be colored with a colored pigment as required. In this example, coloring is performed by
the addition of carbon black.
[0023]
(Example 2) Foamed urethane is heated and pressed at the outer peripheral edge of diaphragm
body 1 by injection molding of PP (polypropylene) resin to form edge 2 and further a gasket 3
with a thickness of 0.75 mm. Is coated with a polyester resin with a viscosity A (by a Gardner
viscometer) and an active ingredient content of about 50% as a high-solit type paint on a
diaphragm adhered to the edge portion 2 and then at 80 ° C. The film was dried for about 10
minutes to form a film part 5.
[0024]
In addition, as a high-solit type paint, it is not restricted to this and may be other types such as a
lacquer type.
[0025]
Example 3 Beat the UKP.
For example, a polyamide film of about 50 .mu.m is preheated to about 130.degree. C. to
140.degree. C. for a diaphragm obtained through the same manufacturing process as in (Example
1) after adjusting the freeness to about 20.degree. It adheres to the main surface under air
pressure and vacuum.
At this time, the diaphragm body 1 made of paper and the edge 2 made of cotton fabric are
breathable, so they can be stuck by suction under vacuum, but the gasket 3 has poor
breathability. This portion was heated and pressurized with a mold of a shape, and adhesion was
performed simultaneously with the diaphragm body portion 1 and the edge portion 2.
[0026]
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In the case of the speaker diaphragm manufactured as described above, in the case of the paint
of the filler-containing type in (Example 1), as shown in FIG. 3, the gap between the film 8 and
the wood pulp fiber 6 The filler 7 intrudes into the space to close the gap, and prevents the
penetration into the inside of the film 8 containing the urethane component.
[0027]
Thus, the film portion 5 can be integrally provided on the diaphragm body 1, the edge portion 2,
and the gasket portion 3.
Further, when the filler 7 is blended, a relatively soft coated film can be obtained, so that the high
frequency resonance of the speaker can be damped, and the output sound pressure frequency
characteristics can be flattened. Further, in the case of the high solid type paint as shown in
(Example 2), the sealing effect is slightly low and it is not suitable for the porous diaphragm main
body 1, but in the case of plastic such as PP Is applicable to
[0028]
Next, the action of the edge portion 2 on the lowest resonance frequency F0 will be described.
First, the results of measurement of the F0 value (minimum resonance frequency) of the speaker
diaphragm after processing manufactured according to the above-mentioned (Example 1) and the
conventional speaker diaphragm before processing are shown in FIG.
[0029]
As can be understood from the figure, the variation of the F0 value is smaller in the case of the
present embodiment in which the film portion 5 is applied as compared with the conventional
one before the treatment. In general, when the post-treatment is applied to the edge portion 2,
the hardness always increases to increase the F0 value significantly. However, in this example,
the filler composition improves the internal loss and a soft film is obtained. It was possible to
avoid this from that.
[0030]
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In particular, when a coating film was attached to about 20% of the edge portion, the F0 value
tended to depend on the coating film. That is, before the treatment, although the F0 value varied
from 45 HZ to 55 HZ with the boundary of 49 HZ, the variation became about 47 HZ to 52 HZ
after the treatment, and the variation was reduced.
[0031]
The same effect is exhibited in (Example 2) and (Example 3), but the F0 value is slightly higher
than when the filler is blended.
[0032]
As for air permeability, according to the air permeability test based on JIS P8117, air
permeability to 100 ml was not recognized even after 30 minutes, and low air permeability was
confirmed.
Further, with regard to the reliability of the adhesive strength, as a result of measuring the tensile
strength of these bonded parts, almost the same strength as that obtained by the reinforcing
adhesion was obtained.
[0033]
Further, since the main surface of the speaker diaphragm is integrally covered with the film
portion 5, each component constituting the speaker diaphragm is protected from water droplets,
humidity, and the like.
[0034]
In each of the above embodiments, although the case of the speaker diaphragm formed by
papermaking and injection molding has been described, it may be formed of metal or non-woven
fabric, and the material of the edge portion 2 is also cotton cloth Not only molded articles of
urethane or urethane but also other materials such as rubber may be used.
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Moreover, the same effect can be expected by the above-mentioned film processing also in the
diaphragm and the fixed cone which do not have the gasket portion 3.
[0035]
Furthermore, although the case where the integral film part 5 was formed in the main surface of
the diaphragm for speakers was demonstrated in each Example, not only this but a back surface
or both surfaces may be sufficient.
[0036]
As described above, according to the speaker diaphragm of the present invention, in the speaker
diaphragm of the present invention, the film is integrally formed on at least the main surface of
each component constituting the diaphragm. The following effects can be obtained.
(1) It is possible to improve the bonding reliability of each component. (2) Since the reinforcing
adhesion of each component is unnecessary and the strength of the edge can be remarkably
increased, the edge resonance in the middle range can be suppressed, so that the frequency
characteristic is improved. (3) It is possible to suppress the variation of the lowest resonance
frequency F0 value. (4) Water resistance and moisture resistance can be imparted, and the air
permeability of the diaphragm can be eliminated, so that the performance can be improved.
[0037]
Brief description of the drawings
[0038]
1 is a diagram showing an example of a conventional speaker diaphragm.
[0039]
2 is a diagram showing an embodiment of the speaker diaphragm of the present invention.
[0040]
3 is an enlarged cross-sectional view of the film portion of FIG.
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[0041]
4 is a diagram showing the case where the change in F0 associated with the treatment of the
coating portion is compared with that of the conventional untreated.
[0042]
Explanation of sign
[0043]
DESCRIPTION OF SYMBOLS 1 diaphragm body 2 edge part 3 gasket part 4 reinforcement
adhesion part 5 film part 6 wood pulp fiber 7 filler 8 film
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