close

Вход

Забыли?

вход по аккаунту

?

JPH08242497

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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 JPH08242497
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for a speaker, and more particularly to a diaphragm for a soft dome
speaker.
[0002]
2. Description of the Related Art Conventionally, a diaphragm made of paper having acoustically
well-balanced physical properties and made of paper made of inexpensive pulp as a raw material
has been widely used, but complicated production using natural cellulose fibers It is not stable in
quality because it is completed through the process, and it has the disadvantage of high heat
resistance but extremely poor moisture resistance. Recently, there are still many paper
diaphragms in full band speakers and the like, but for example, in high frequency band dedicated
dome speakers, various materials have been developed in search of stable quality and optimum
performance from paper diaphragms.
[0003]
Hard dome diaphragms that increase the high-band resonance frequency with the aim of
improving the elastic modulus and expand the reproduction band, and the unnecessary split
resonances in the reproduction band with the main aim of increasing the internal loss. There is a
soft dome diaphragm that is intended to reduce as much as possible.
11-05-2019
1
[0004]
Examples of metals include metals such as aluminum and titanium having a flexural modulus
exceeding 50 GPa (gigapascals) and inorganic materials, polyesters having a flexural modulus of
about 2 to 20 GPa, polyetherimide, polyimide, and paraphenylene terephthalamide Hard plastic
is used.
By adopting these materials, heat resistance, moisture resistance and weather resistance are
often improved along with improvement of flexural modulus, but internal loss tends to be small.
[0005]
For example, a method of applying and molding a dumping agent for sealing to a woven fabric
such as cotton, polyester, silk, etc. has been widely used, but it is a composite material that has a
directionality unique to woven fabric and is easily deformed. It lacks stability of quality.
[0006]
As a single material, a soft plastic such as nylon resin having a flexural modulus of 0.1 to 1.0 GPa
is used.
By adopting this material, quality stability and moisture resistance are improved in addition to
the improvement of internal loss, but heat resistance and weather resistance often deteriorate.
That is, nylon resins are strong as organic solvent adhesives applied during diaphragm assembly,
have high fatigue strength and relatively large internal loss, and are suitable as the basic resin for
diaphragms for soft dome speakers, but are desirable alone Physical properties can not be
obtained, and in order to obtain a bending elastic modulus of 0.1 to 1.0 GPa suitable for a
diaphragm for a soft dome speaker and a large internal loss, a plasticizer is conventionally
compounded to the basic nylon resin It was Heat resistance and weather resistance are impaired
by this plasticizer. However, there are still many users who prefer the smooth reproduction
sound quality obtained by the soft dome, and improvement in quality stability, heat resistance
and weather resistance of the soft dome is still desired.
[0007]
11-05-2019
2
Furthermore, when the flexural modulus of a single material is less than 0.1 GPa, sufficient
rigidity as a diaphragm can not be obtained, and it is not generally used as a diaphragm that
radiates sound waves, and is mainly an elastic support of a speaker It will be used only at the
edge of the diaphragm. For such use, elastomer resins such as vulcanized rubber, polyurethane
elastomer, EPDM elastomer, olefin elastomer, polyesteramide elastomer are used as a single
material.
[0008]
[Problems to be Solved by the Invention] However, in the conventional diaphragm for soft dome
speakers formed of woven fabric such as cotton, polyester, silk, etc., it is a composite material
which has a directionality peculiar to the woven fabric and is easily deformed. Lack of stability of
quality. In addition, in the diaphragm for soft dome speakers by adopting soft plastic material
such as nylon resin which is a single material, in addition to the improvement of internal loss,
quality stability and moisture resistance are improved, but heat resistance and weather resistance
There is a problem of being inferior.
[0009]
The present invention has been made in view of these points, and it is an object of the present
invention to provide a diaphragm for a soft dome speaker, which is excellent in quality stability,
heat resistance, and weather resistance, and has a large internal loss.
[0010]
[Means for Solving the Problems] In order to solve the above problems, the diaphragm for a soft
dome speaker according to the present invention has a flexural modulus of 0.1 to 1.0 GPa (23 °
C. absolute drying, ASTM (American Society for Testing and Materials) characterized by being
composed of an olefin-based elastomer-modified nylon resin film having D 790), and having a
flexural modulus of 0.1 to 1.0 GPa (23 ° C. absolute drying, ASTM D 790) It is characterized in
that it is composed of an alloy resin film of an olefin-based elastomer resin and nylon resin, and it
is further characterized in that the nylon resin is 6 nylon or 66 nylon.
[0011]
In the present invention, since the nylon resin, which is the main component, is modified with an
olefin elastomer resin having flexibility and a large internal loss to obtain an appropriate flexural
11-05-2019
3
modulus and an internal loss, volatilization like a plasticizer can be achieved. It is possible to
dramatically improve the weatherability and stability by maintaining the high heat resistance
originally possessed by the nylon resin.
[0012]
An embodiment of the present invention will be described below with reference to the drawings.
Figures 1-3 are examples of the present invention.
FIG. 1 is a cross-sectional view of the soft dome speaker diaphragm 1 in which the dome portion
2 and the edge portion 3 are integrally formed, and FIG. 2 is a balance drive in which the dome
shaped diaphragm portion 6 and the cone shaped diaphragm portion 7 are combined. FIG. 3 is a
cross-sectional view of the center cap 9, and FIG.
[0013]
Next, an embodiment will be described by taking a soft dome speaker diaphragm as an example.
As a material of the diaphragm, a pellet produced by mixing 3% of a master batch of a carbon
pigment with an olefin-based elastomer-modified 6 nylon resin manufactured by DuPont under
the trade name ZYTEL FN 727 is molded with a film forming machine to have a thickness of 0 A
film of .13 mm was obtained. This film has a flexural modulus of 0.7 GPa (23 ° C. absolute dry,
ASTM D 790), a specific gravity of 1.0 (ASTM D-792) and a melting point of 220 ° C. (ASTM D3418). It was in-house measurement by law). Furthermore, after heating an iron lamination mold
accurately processed into the shape of the diaphragm for soft dome speakers to a temperature of
180 ° C., the above 0.13 mm film is sandwiched and pressed for about 10 seconds with a force
of about 5 kN, and then the mold Then, the mold was opened and the molded product was taken
out to obtain a diaphragm for a soft dome speaker conforming to the voice coil diameter φ25.
[0014]
11-05-2019
4
At the same time, as a comparative example, a conventional Hoechst nylon resin Supronyl, which
has been used, was formed into a 0.13 mm film and molded under the same conditions. However,
since Supronyl had a heat deformation temperature lower than that of the film according to the
example, the mold temperature at pressing was 130 ° C., and the mold temperature at removal
was 70 ° C. The diaphragm may be one in which a film is molded, or one in which a molten
resin is molded into a dome shape by an injection molding machine.
[0015]
Measure the frequency characteristics by incorporating these two types of soft dome speaker
diaphragms into a speaker, and then take out after the heat resistance test left for 85 hours at 85
° C in a high temperature bath for 96 hours. It was measured. That is, FIG. 4 is a diagram
showing frequency characteristics before and after the heat resistance test of the speaker using
the diaphragm for soft dome speaker according to the embodiment, and FIG. 5 is a heat
resistance test of the speaker using the diaphragm for soft dome speaker in the conventional
example. It is a figure showing the frequency characteristic in back and front.
[0016]
In the figure, the solid line A is the frequency characteristic before the heat resistance test
according to the embodiment, and the broken line B is the frequency characteristic after the heat
resistance test. The solid line C is the frequency characteristic before the heat resistance test
according to the conventional example, and the broken line D is the frequency characteristic after
the heat resistance test. There is no big difference in the frequency characteristics before the
heat resistance test of these two types of soft dome speaker diaphragms, that is, solid line A and
solid line C, and the soft dome speaker diaphragm according to the embodiment is a conventional
soft dome speaker vibration It can be seen that it has the same initial performance as the plate.
[0017]
Next, comparing the frequency characteristics after each heat resistance test, the broken line D of
the conventional soft dome speaker diaphragm of FIG. 5 is from 10 kHz to 15 kHz with respect
to the broken line B of the soft dome speaker diaphragm according to the embodiment of FIG.
The band largely fluctuates, and it can be confirmed that the heat resistance of the diaphragm for
a soft dome speaker according to the example is excellent. Further, as a result of observing the
11-05-2019
5
speaker after the heat resistance test, it was found that the shape of the dome portion of the
conventional diaphragm for soft dome speaker causes thermal deformation and the resin is
cured.
[0018]
FIG. 6 compares the changes in the tensile modulus (measured in-house by the vibration lead
method) in the ultraviolet irradiation accelerated test of the resin film used for the soft dome
speaker diaphragm according to the embodiment and the soft dome speaker diaphragm
according to the conventional example. FIG. In order to confirm the weather resistance of both
diaphragms, the film of 0.13 mm before molding was subjected to an ultraviolet irradiation
accelerated test with a carbon arc single-lamp type sunshine weather meter (black panel
temperature 83 ° C). The degree of increase in elastic modulus after the test when it is 1 is
represented by the ratio of the curing rate. In the figure, the solid line E represents the curing
rate with respect to the accelerated test time in the examples, and ス ポ ッ ト represents the spot.
The broken line F represents the curing rate to the accelerated test time in the conventional
example, and Δ is the spot. The example of the prior art cures up to three times the tensile
modulus before the test, and the performance of the speaker changes significantly, whereas the
example of the prior art shows a significant improvement of only 1.4 times.
[0019]
In this way, it is possible to obtain quality stability by using a single material instead of a
composite material that forms a woven fabric and applies a dumping agent that serves as a filler,
and at the same time the heat resistance and weather resistance of conventional resins are
improved from the original It is possible to make a significant improvement, and eliminate the
defects related to the reliability of the diaphragm for soft dome speakers, so that the inherent
sound quality can be utilized. In particular, it has become possible to apply to an on-vehicle
speaker, an outdoor speaker, etc. which could not be adopted by the conventional nylon-based
resin diaphragm. The present invention is not limited to the dome-shaped diaphragm, and can be
applied to a cone-shaped, balance-drive-type diaphragm and the like.
[0020]
As described above, the diaphragm for a soft dome speaker according to the present invention is
made of an olefin-based elastomer-modified nylon resin film having a flexural modulus of 0.1 to
1.0 GPa, so Quality stability can be obtained with one material, and at the same time, the high
11-05-2019
6
heat resistance inherent to nylon resin can be maintained to dramatically improve the weather
resistance and stability, as well as in-vehicle speakers and outdoor speakers It became possible to
apply to etc.
[0021]
Brief description of the drawings
[0022]
FIG. 1 is a cross-sectional view of a soft dome speaker diaphragm in which a dome portion and
an edge portion are integrally formed according to an embodiment of the present invention.
[0023]
FIG. 2 is a cross-sectional view of a balance drive type speaker diaphragm in which a dome type
diaphragm and a cone type diaphragm in the embodiment of the present invention are combined.
[0024]
FIG. 3 is a cross-sectional view of a center cap according to an embodiment of the present
invention.
[0025]
FIG. 4 is a diagram showing frequency characteristics before and after a heat resistance test of a
speaker using a diaphragm for a soft dome speaker according to the present invention.
[0026]
FIG. 5 is a diagram showing frequency characteristics before and after a heat resistance test of a
speaker using a diaphragm for a soft dome speaker in the conventional example.
[0027]
FIG. 6 is a diagram comparing the change in tensile modulus in the ultraviolet irradiation
accelerated test of the soft dome speaker diaphragm according to the present invention and the
resin film used for the soft dome speaker diaphragm according to the prior art.
11-05-2019
7
[0028]
Explanation of sign
[0029]
Reference Signs List 1 diaphragm for soft dome speaker 2 dome portion 3 edge portion 5
diaphragm for balance drive type speaker 6 dome diaphragm portion 7 cone type diaphragm
portion 9 center cap
11-05-2019
8
Документ
Категория
Без категории
Просмотров
0
Размер файла
17 Кб
Теги
jph08242497
1/--страниц
Пожаловаться на содержимое документа