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JPS61118098

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DESCRIPTION JPS61118098
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for an electroacoustic transducer such as a speaker and a microphone. (Technical
background of the invention and its problems) Generally, the points required as diaphragms for
electroacoustic transducers such as speakers, microphones, etc. are (a) light weight, (b) high
rigidity (Young's modulus E) And (3) the ratio of Young's modulus E to density ρ, that is, the
specific elastic modulus% and the sound propagation velocity JW are large. By the way, as a
forming material of such a diaphragm, (the thing mainly using natural fiber such as al plant fiber,
animal fiber, mineral fiber, etc. (bl Those impregnated with a resin, those using a plastic sheet
such as (Cl polypropylene, polyethylene terephthalate, etc., those using an elemental metal such
as dl aluminum or titanium, and the like are listed. Among them, the diaphragm formed using the
above-mentioned natural fiber as a main raw material has a large internal loss tan δ, so that flat
frequency characteristics can be obtained, but it tends to absorb moisture. As a result, since the
sound quality changes, the sound quality is deteriorated due to the secular change. The natural
fibers of the above Fb 1 impregnated with a thermosetting resin such as phenol resin or epoxy
resin have low internal loss tan δ and high density 、, so the plate thickness is small to make the
diaphragm lightweight. (There was a drawback that the peak characteristic in the frequency
characteristic was generated. The diaphragm made of plastic sheet such as polypropylene and
polyethylene terephthalate described in (C) above is excellent in waterproofness, but it is easily
deformed in a high temperature atmosphere at about 100 ° C, and the cost is low. Has the
drawback of being expensive. Furthermore, although the imaging plate molded using a single
metal such as aluminum or titanium in the above (d1) has a large Young's modulus E, it is
difficult to damp the high-frequency resonance because the internal loss tan δ is small.
However, not only the elongation of the material is limited, the processability is bad, but the cost
is very expensive. Thus, the materials listed in the above (al to (d) were not suitable as materials
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for forming the diaphragm for an electroacoustic transducer. (Object of the Invention) The
present invention has been made in view of the above-described points, and the object of the
present invention is to eliminate pins and holes, to have complete waterproofness, to be easy to
process, and to be inexpensive. In addition, physical properties such as Young's modulus E,
specific elastic modulus%, sound propagation speed F, etc. are large and flat high frequency
characteristics can be obtained. An electro-acoustic transducer diaphragm is provided.
According to the summary of the present invention, a polyamide-based resin is laminated on a
main body of a natural fiber or a diaphragm mainly made of natural fiber to form a laminate
layer, and a synthetic resin liquid Il! The basic feature is the formation of a layer. Embodiments of
the Invention Several embodiments of the present invention will now be described with reference
to the drawings along with manufacturing steps. 1 is an example of an apparatus used for
practicing the present invention, and the apparatus 1 is formed of a lower mold 2 and an upper
mold 3 which can be engaged with the lower mold 2. Inside the lower mold 2 is provided a
housing recess 2b which communicates with the air inlet 2a and conforms to the desired shape
of the diaphragm main body 4, and the upper mold 3 is supplied with compressed air such as
compressed air. The air supply recessed part 3b which leads to the air supply port 3a to be done
is provided. The diaphragm main body 4 is formed, for example, by mixing synthetic fibers or
semi-synthetic fibers with corn paper mainly made of a natural fiber and natural fibers as a main
component. A laminate layer 5 is formed on the diaphragm main body 4. As the laminate layer 5,
for example, a thermoplastic polyamide resin as a film of plastics having waterproofness and heat
resistance is used. Reference numeral 6 denotes a synthetic resin film layer formed on the
surface of the laminate layer 5. As the synthetic resin film layer 6, for example, a nitrocellulosebased lacquer / enamel paint having high surface hardness is used. Then, in order to
manufacture the imaging plate 7, first, as the first step, the diaphragm main body 4 is
accommodated in the accommodation recess 2b of the lower mold 2, and between the lower
mold 2 and the upper mold 3 above it. A film 5a of polyamide resin, which is a thermoplastic
resin having waterproofness and heat resistance, to be formed with Laminenito Ji5 is installed.
Next, in the second step, the softening point of the film 5a is selected, and the film 5a is heated
and softened. Further, in the third step, with the film 5 a sandwiched between the upper mold 3
and the lower mold 2, the upper mold 3 is made to collide with the lower mold 2. In this case,
although the upper die 3 is usually lowered relative to the lower die 2, the lower die 2 may be
raised relative to the upper die 3. Thereafter, in the fourth step, the inside of the housing recess
2b of the lower mold 2 is drawn in from the air inlet 2a to the film 5a by using a vacuum pump
or the like to evacuate and the compressed air is filmed by the film 5a using a compressor or the
like. When pressure is fed from the pressure port 3 a into the upper mold 3, the film 5 a softened
by heating is deformed, and the laminate layer 5 is formed on the upper surface of the
diaphragm main body 4. After that, as the fifth step, synthetic resin liquid 11i!
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Jti 6 is formed to manufacture the diaphragm 7. Example 1 First, a diaphragm main body 4
formed in a cone shape having a thickness of about 300 to 400 μm using pulp fibers as natural
fibers of UKP 20 ° SR is accommodated in the housing recess 2b of the lower mold 2 A
polyamide resin film 5a having a thickness of 20 to 50 μm is disposed between the upper mold
3 and the lower mold 2 at the upper side, and is heated and softened at about 150 ° C. for
several seconds by a heater. Then, suction is performed with a suction pressure of, for example,
about 20 aaHg from the suction port 2a of the lower mold 2 by a vacuum pump, and the inside
of the housing recess 2b is evacuated and compressed air C is pumped by the compressor into
the pressure port 3a of the upper mold 3. A film 5a of a polyamide resin having a thickness of
about 20 μm is laminated on the upper surface of the diaphragm main body 4 to form a
laminate layer 5, and thereafter, the diaphragm main body 4 in which the laminate layer 5 is
formed as described above. The diaphragm 7 is manufactured by forming a synthetic resin film
layer 6 of about 100 μm in thickness made of nitrocellulose-based lacquer and enamel on the
surface of the laminate layer 5 by spray coating. In this embodiment, the thickness of the film 5a
of the polyamide resin is selected in the range of 20 to 50 μm in the case of a deep mold for
laminating the film 5a having a thickness of 20 μm not-dropped on the diaphragm main body 4
When laminating the film 5a thicker than 50 μm to the diaphragm main body 4 is not
appropriate because the film 5a itself extends, and the weight of the diaphragm 7 is heavy, the
sensitivity is deteriorated, and it is inappropriate. It is because (Example 2) A diaphragm main
body 4 formed in a cone shape with a thickness of about 300 to 400 μm using pulp fibers as
natural fibers of UKP 20 ° SR is accommodated in the accommodation concave portion 2b of
the lower mold 2 A film 5a of a polyamide resin having a thickness of 20 to 50 μm is disposed
between the upper mold 3 and the lower mold 2 and is softened by heating at about 150 ° C.
for several seconds by a heater. Then, suction is performed with a suction pressure of, for
example, about 20 cmHg from the suction port 2a of the lower mold 2 by a vacuum pump, and
the inside of the accommodation recess 2b is vacuumed and compressed air C is pumped with a
complimenter into the pressure port 3a of the upper mold 3. A film 5a of a polyamide resin
having a thickness of about 20 μm is laminated on the upper surface of the diaphragm main
body 4 to form a laminate layer 5, and thereafter, a synthetic resin of vinyl acetate resin having a
thickness of about 100 μm is formed on the surface of the laminate layer 5. The resin film layer
6 was formed, and the diaphragm 7 was manufactured. The diaphragm 7 for speakers of the
above-mentioned Example 1 and Example 2 thus obtained, a diaphragm molded only with pulp
fibers as natural fibers of UKP 20 ′ ′ SR not subjected to lamination processing, and UKP 20
° SR A conventional diaphragm made by laminating a polyamide resin with a thickness of 40
μm on pulp fibers as natural fibers and molded, using 1ool of polypropylene as plastic and
100% by weight of polyethylene terephthalate. The physical characteristics of the speaker
diaphragm and the density ρ, Young's modulus E, internal loss tan δ, propagation velocity p 2
and so on are compared to obtain Table 1 below.
As is apparent from Table 1 above, the diaphragms of Example 1 and Example 2 are diaphragms
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formed of pulp fibers of UKP 20 ° SR as density ρ as natural fibers, and pulps of this UKP 20
'SR In the case of an imaging plate in which only a laminate layer of a 40 μm thick polyamide
resin is formed mainly on a diaphragm made of fibers, it is 0.60 (g / cIIl) and 0.63 (g / cnl).
Although slightly larger, conventional imaging plates made of polypropylene or polyethylene
terephthalate are 0.90 (g / cal), 1.40 (g / cJ), much smaller and lighter. Further, with regard to
Young's modulus E, the diaphragm of the first example of the present invention is 2.8 × 10 ′ ′
while the conventional diaphragm molded of polypropylene is 1.8 × 10 ′ ′ (dyn / CIl). (Dyn /
Ca1), which is large. With regard to the internal loss tan δ, the diaphragm of the first
embodiment or the second embodiment of the present invention is 5.2 × 10 ′ while the
conventional diaphragm molded of polyethylene terephthalate is 2.0 × 10 ′. It will be 6.0 x 10
'and will be much larger. Further, with regard to the propagation speed 4, in Example 1, 2. OX 10
′ (c + a / 5 ec), which is 1.4 × 10 ′ (al / 5ea) in Example 2. In Example 1, it is larger than any
of the conventional products shown in Table I, and in Example 2. Is as large as a conventional
diaphragm molded of polypropylene. Moreover, in the diaphragm of the present invention, the
laminate layer 5 of the polyamide resin film 5a is formed on the upper surface of the diaphragm
main body 4 consisting of the valve fiber of UKP 20 ° SR as natural fiber, and further, the
nitrocellulose based lacquer is formed on the surface.・ Synthetic resin liquid IIl consisting of
enamel paint and vinyl acetate resin! Since the layer 6 is formed, there are no bins and holes, and
a diaphragm made of only natural fibers, or a conventional diaphragm in which a laminate layer
made of only polyamide resin is formed on the diaphragm main body 4 made of natural fibers It
has a waterproof property that can not be removed, it also has excellent surface gloss, and it is @
heat resistant even at high temperatures of about 100 ° C. Further, as shown in FIG. 5, the
moving plate 7 of Example 1 'of the present invention is formed of natural fibers as compared
with the conventional frequency characteristic B molded with 100% by weight of polyethylene
terephthalate as in the sound pressure frequency characteristic. The flat frequency characteristic
A unique to the obtained diaphragm is obtained.
Although the thermoplastic film 5a is laminated on the upper surface of the diaphragm main
body 4 in each of the first embodiment and the second embodiment, the film 5a is disposed
below the diaphragm main body 4 If the upper mold 3 is made to butt against the lower mold 2
after being accommodated in the accommodation recess 2 b of the mold 2, plastics having heat
resistance and waterproofness on the lower surface or both upper and lower surfaces of the
diaphragm main body 4 It is needless to say that the film 5a can be laminated. As described
above, according to the present invention, a polyamide resin is laminated on a main body of a
natural fiber or a diaphragm mainly composed of a natural fiber to form a laminate layer, and a
synthetic resin film layer is formed on the surface of the laminate layer. As a result, there is no
pin or hole, and waterproofness is exhibited, and the whole diaphragm does not impair physical
characteristics such as the propagation speed 5 unique to natural fibers, and is suitable as a
forming material of the diaphragm. Furthermore, unlike conventional diaphragms molded with a
single metal, it is sufficient to form a synthetic resin film layer on the surface of the laminate
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layer after laminating the diaphragm main body in a mold, and thus it can be easily
manufactured and easily processed. As a result, the yield is not deteriorated and the cost is
reduced.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing one embodiment of the diaphragm for electro-acoustic
transducer of the present invention, FIG. 2 is an enlarged cross-sectional view within the circle A
of FIG. 1, and FIG. FIG. 4 is a cross-sectional view of a state in which a plastic film is laminated on
the main body of the diaphragm, and FIG. 5 is a view of the moving plate of the present invention
formed of only polyethylene terephthalate and natural fibers. It is each sound pressure frequency
characteristic figure.
2 ... lower mold, 3 ... upper mold, 4 ... diaphragm mainly, 5a ... film, 5 ... laminate layer, 6 ...
synthetic resin coating layer, 7 ... vibration plate .
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