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JPS5357021

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DESCRIPTION JPS5357021
Description 1, title of the invention
Dome diaphragm
3. Detailed Description of the Invention The present invention relates to a diaphragm base fabric
made of cotton, hemp, silk, synthetic fiber, etc., and to a dome diaphragm formed into a dome
shape, the object of the present invention being suitable for the diaphragm base fabric. (1) The
soft elasticity of the hair, the appropriate rigidity, the internal loss against the vibration are given,
and the excellent heat resistance and cold resistance are given to obtain an excellent
characteristic force dome diaphragm. . Generally, it is well known that a cloth such as cotton,
hemp, silk, synthetic fiber, etc. is used as a base cloth of a dome diaphragm of a speaker, and
conventionally, as a dome diaphragm of this type, a base cloth such as phenol resin is used. After
being impregnated with a thermosetting resin, heated and pressurized to form a dome shape, the
base fabric has soft elasticity, internal loss, and the purpose of providing airtightness, and the
surface of the same base fabric is silicone rubber, synthetic rubber There is a structure σ coated
with latex, nitrocellulose, acrylic ester emulsion, etc. The dome diaphragm of such a structure not
only provides adequate soft elasticity fI-, but also has insufficient internal loss against vibration
and lack of rigidity of the fabric base cloth. In the divided vibration range, concentric divided
resonance at the top of the diaphragm, nasty abnormal vibration such as his vibration l111 etc.
are generated, and especially the second harmonic distortion is generated a lot ○ such as on the
surface of the diaphragm base cloth The purpose of dome application coated with acrylic ester
EMALLO 7 Even with a structure coated with an adhesive composed mainly of stychol resin gold
with gold, as shown in FIG. 2, occurrence of second harmonic distortion in the divided vibration
region Could not be removed. EndPage: The present invention eliminates such drawbacks and
will be described below. The present invention is characterized by a structure in which a
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fluororubber film is formed on at least one of the front and back surfaces of a dome-shaped
diaphragm base fabric. The fluororubber in the present invention is a fluorinated vinylo /
.hexafluoropropylene copolymer, a fluorinated apolyester rubber. Hereinafter, an example using
vinylidene fluoride / hexafluoropropylene copolymer as the fluororubber will be described. In
FIG. 3, an aromatic polyamide-based fiber, that is, a diaphragm base fabric (1) composed of an
organic synthetic fiber composed mainly of polymetaphenylene isophthalamide and mainly
composed of metaphenylene diamine and inphthalic acid chloride, For example, the product
name "Corex" (registered trademark of Teijin Ltd., a product made by the company) is
impregnated with a phenol resin as a shape-retaining agent, dried by impregnating a reactive
acrylic ester emulsion, dried and then subjected to D0 heat pressure and dome The base fabric
(1) is completely flexible and airtight (closed).
After that, a liquid polymer of vinylidene fluoride / hexafluoropropylene copolymer on the back
of base cloth (1), 100 parts by weight of the brand name "VERFLON" (registered trademark of
Kinyo Co., Ltd., made by the company) and 5 parts by weight of curing agent The adjusted base
rubber paint was applied, dried and cured to form a film (2). The structure of the diaphragm
completed in this way is based on the back surface of the backing (1) based on a fluororubber
film (2) having a high degree of internal loss against vibration, a hardness of suitable + fi, and a
flexible elasticity. It is formed in a state of being firmly in close contact with 1). Therefore, by the
fluorine rubber film (2), the vibration of the diaphragm base (1) is appropriately suppressed to an
appropriate level of soft elasticity, sufficient resonance with respect to vibration, abnormal
vibration such as waving vibration, etc. As shown in the & characteristics chart, second harmonic
distortion is particularly suppressed and reduced in a divided vibration region of 3 to 6 ft [z], and
a high quality reproduced sound with less distortion is obtained. In addition, since the
fluororubber film (2) is excellent in weatherability, heat resistance and cold resistance (-30 "C to
250 ° C), and hardly shows any deterioration over time, the desired characteristics can be
maintained for many years ○ In the present invention, a base fabric composed of natural fibers
such as cotton, hemp, silk etc. and other synthetic fibers as the base fabric (1) is also applicable,
and fluorine is directly applied to the molded base fabric (1) The rubber film (2) may be entirely
formed. As described above, the present invention has a structure in which the fluororubber film
(2) is entirely formed on at least one of the front and back surfaces of the base fabric (1), and has
sufficient internal loss against moderate soft elasticity, rigidity and vibration. As a result, good
quality reproduced sound with less distortion can be obtained, and it has the advantage of being
able to keep the excellent characteristics of one expected for many years.
4. Brief description of the drawings FIGS. 1 and 2 show the frequency characteristics of the
conventional dome diaphragm, FIG. 3 shows the structure of the dome diaphragm of the present
invention, and FIG. 4 shows the same frequency. It is a figure which shows a characteristic. (1) is
a diaphragm base cloth, and (2) is a fluorine rubber film. 0EndPage: 2 rounds of sediment [Hzl
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Fig. 1 浪 Hz [Hzl 30th frequency [Hzl hair 4 trouble EndPage: 3
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