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JPS61225998

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DESCRIPTION JPS61225998
[0001]
The present invention relates to a diaphragm for a speaker. BACKGROUND ART FIG. 1 is a crosssectional view showing an example of a cone type speaker. In such a speaker, the pole piece 2 is
mounted at the central portion of the back plate 1, and the magnet 3 is mounted at the
peripheral portion of the back plate 1. The plate 4 is placed on the magnet 3 to form a magnetic
gap with the pole piece 2. A voice coil bobbin 6 carrying a voice coil 5 is inserted in the magnetic
gap so as to be freely movable and supported by a damper 7. The voice coil bobbin 6 is coupled
to the central hole of the diaphragm cone 8 and the center cap 9 is crowned in the vicinity of the
central hole. The opening peripheral edge of the cone 8 is supported by the frame 11 through
the etch 10. The etch 10 is further secured to the frame 11 by a gasket 12. The lead of the voice
coil is connected to a terminal 14 provided on the side surface of the frame 11 through the tinsel
wire 13. In general, raw material fibers used for a speaker diaphragm are mainly so-called wood
valves, and a large number of wood valves are used in combination with a hemp fiber such as
manila hemp, honey etc. or synthetic fiber. In order for the loudspeaker to faithfully convert the
input signal to an acoustic output, the diaphragm should ideally have a piston motion. For this
purpose, the diaphragm must be rigid. In addition, it is desirable that the diaphragm have a large
Young's modulus and an appropriate internal loss in order to enhance the electroacoustic
conversion efficiency. In recent years, as the use of speakers has been greatly expanded, a
speaker diaphragm having various performances has been required. In particular, with regard to
a diaphragm of a speaker mounted on a vehicle, there is a strong demand in the market for a
speaker diaphragm having water repellency, water resistance, oil resistance and heat resistance.
Since the main material of the speaker diaphragm is a natural bulb, the speaker diaphragm has a
property that a capillary action acts on the gap between 111 to absorb water and oil due to the
hydrophilicity of the natural bulb fiber. Therefore, the speaker diaphragm is internally sized
according to the application to maintain water repellency and water resistance. The inner surface
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sizing is performed by adding a solution of urea resin, melanin resin, 0 gin size or the like as a
sizing agent to the valve suspension at the time of forming the diaphragm base material.
Furthermore, in order to improve the water repellency and the water resistance, the diaphragm
substrate after the paper making is also subjected to the resin impregnation treatment. However,
the usual resin composition, for example, 66.2% of aromatic solvents, 17.0% of acetic esters, 7.0%
of ketones, 4.0% of glycols (high boiling point), 4.0% of nitrifying cotton, plasticization It was not
possible to obtain a speaker diaphragm having sufficient water resistance and oil resistance by
the impregnation treatment with a resin solution consisting of 1.0% of the agent (DOP) and 1.0%
of resin.
Furthermore, as a speaker diaphragm having water resistance and oil resistance, a diaphragm
obtained by molding a thermoplastic resin sheet such as polypropylene is partially adopted.
However, the resin sheet diaphragm has a tendency to be weak to heat, to increase the weight of
the diaphragm and to decrease the efficiency of the speaker, and to deteriorate the weather
resistance as the forming material changes with time. Therefore, a speaker diaphragm that
simultaneously satisfies all of water resistance, oil resistance, heat resistance and weather
resistance has not been obtained. The objective of the present invention is to provide a speaker
diaphragm having water resistance, oil resistance and weather resistance. The diaphragm for a
speaker according to the present invention comprises a diaphragm base made of natural IJAH
and / or chemical fibers as main raw materials and impregnated with a methyl methacrylate
resin solution and dried, and then a fluorine resin solution is used as a diaphragm base. It is
characterized in that the surface of the diaphragm base is covered with a fluorine resin film
which is attached to the surface of the material and dried. EXAMPLES Examples of the present
invention will be described below based on the attached drawings and the following table. FIG. 2
shows a flowchart of manufacturing steps for obtaining the speaker diaphragm of this
embodiment. First, as valve beating process S1, NBKP valve 100% (softwood bleached kraft
valve) is subjected to M5 for about 15 minutes, charged in a predetermined beating machine, and
the valve concentration is about 3.0% so that the physical properties of the valve are not
impaired. The beating is carried out, the stock adjustment of the predetermined beating degree of
20 degrees SR is carried out by the shopper type beating degree measuring machine, the dyeing
is carried out, and the valve is adjusted. Next, in the paper making process S2, the prepared stock
is adjusted to a valve solution having a paper concentration of about 1.0%, and a diaphragm
substrate of a desired shape is made with a paper making net formed in advance in a conical
shape. Next, in the drying step S3, the base material subjected to paper making is heated and
dried at a mold temperature of 180 to 200 ░ C. under a 3 kQ / Cm 2 press pressure using a
predetermined mold. And it dries at about 150 degreeC hot air temperature using a hot air
generator, and obtains a diaphragm base material. Next, as impregnation step S4, a methyl
methacrylate resin solution of the components shown in Table 1 is prepared in advance. The
methyl methacrylate resin solution prepared in Table 1 is diluted with a nitrone thinner to make
a 12.5% solution, and the diaphragm substrate prepared in the diluted solution is dipped and
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impregnated for about 5 minutes. Next, as drying step S5, drying is performed for about 100
minutes with a hot air at about 90 to 100 ░ C. in a drier to adhere the methyl methacrylate resin
to ssi in the diaphragm substrate. Next, as the immersion step S6, a fluorine-based resin solution,
that is, a solution dissolved in 15% ▒ 1% of a fluorine-based resin with 1-1-1-trichloroethane, is
prepared in advance, and vibration obtained by impregnating the fluorine-based resin solution.
Immerse the plate base material for about 3 minutes.
A fluorine-based resin solution is attached to the surface of the diaphragm substrate. Next, as a
drying step S7, drying is performed for about 100 minutes with a hot air at about 90 to 100 ░ C.
in a drier, and the surface of the diaphragm substrate is covered with a fluororesin film. Finally,
in the cutting and forming step S8, a predetermined diaphragm diameter of the diaphragm base
is cut and molded to obtain a speaker diaphragm. FIG. 3 is a partially enlarged cross-sectional
view of the diaphragm for a speaker of the present invention, in which the moving plate M of
which the methyl methacrylate resin 16 is attached to the pulp fiber 15 and the fluorine resin
WA17 is made of pulp II fiber 15 It indicates that the surface is covered. FIG. 4 is a graph
showing sound pressure frequency characteristics (curve A) of a speaker using the speaker
diaphragm of the present invention and a conventional one (curve B). It can be seen that there is
no difference in characteristics between the two in comparison. The physical properties of the
speaker diaphragm of the present example obtained in Table 2 and those of the conventional one
are shown. The physical property values of the sample from both diaphragms are 1. It is the
result of measuring Young's modulus and internal loss by vibration lead method in the
environment of oCm О 4.5 cm cut air temperature 20 ░ C. humidity 60%. When the two are
compared, the physical property values of the speaker diaphragm of this example are 22% in
Young's modulus, f] = 10.4% in the unlikely event of the conventional one, and the internal loss is
increased by about 16 ░ 9%. It shows remarkable improvement of physical properties. Table 2
Table 3 shows the results of various tests of the diaphragm of the present invention, and shows
that the diaphragm of the present invention can withstand the conditions conforming to each
test. As shown in Table 3, according to the present invention, since the surface of the diaphragm
substrate is strongly covered with the fluorine resin film by the sealing film effect by the
methacrylate resin impregnation treatment and the fluorine resin immersion treatment, the
vehicle When it is used outdoors such as door mounts, it prevents rain and water during car
wash, penetration of detergent water, and also prevents penetration of fats and oils such as oil
and grease. An oil- and water-resistant diaphragm can be obtained which does not show a large
change. In addition, a solvent-resistant heat-resistant diaphragm is obtained which does not
cause a reduction in strength due to penetration of a solvent and does not change acoustic
characteristics such as frequency characteristics and damping characteristics in the low range
even at 150 to 200 ░ C. Be Furthermore, since there is no stretching deformation due to
humidity and the wet strength is high, it is possible to obtain a diaphragm which does not require
the moisture resistance treatment of F such as urea resin melanin resin in the direction of FJ
moisture strength.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a cone type speaker, FIG. 2 is a flow chart showing processing
steps for manufacturing a pickup plate for a speaker of the present invention, and FIG. 3 is a
partially enlarged view of a speaker diaphragm of the present invention FIG. 4 is a cross-sectional
view, and FIG. 4 is a graph showing sound pressure frequency characteristics of a speaker
imaging plate of the present invention and a speaker using the conventional one.
Explanation of symbols of main parts 1 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и voice coil 6 ...... ........... film
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