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JPS60111599

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DESCRIPTION JPS60111599
[0001]
The present invention relates to a speaker damper. Generally, as a typical damper for a speaker,
there are a waveform damper in which a cloth is impregnated with a synthetic resin, a wedge
damper using an existing Sieberlite plate, and the like. Such a conventional speaker damper uses
a woven fabric or a non-woven fabric made of natural fibers, synthetic fibers or the like as a base
fabric, is appropriately resin-processed and is formed into a predetermined shape. This speaker
damper holds the voice coil in the magnetic gap between the pole piece and the plate and holds
the bobbin exactly in place, maintaining the mobility and linearity only in the direction of
movement of the bobbin, and further the magnetism It is required to have dust resistance into
the air gap. However, since such a conventional speaker damper does not have flame retardancy,
there is a risk of ignition due to excessive heat generation, for example, when excessive input is
made to a voice coil. As described above, when considered from the viewpoint of structural flame
resistance of the speaker, the fact that the speaker damper does not have flame resistance is a
major drawback. In addition, the conventional speaker damper has a drawback in that expansion
and contraction of the thread forming the base fabric occurs and changes due to changes in the
environment such as temperature and humidity. 0 The object of the present invention is excellent
in both flame retardancy and dimensional stability It is providing a damper for speakers. The
damper for a speaker according to the present invention is formed by attaching a thermosetting
resin and an organic phosphorus-containing nitrogen compound based flame retardant to a base
fabric on which an acrylic resin based synthetic fiber is spun and woven, drying it and forming it
into a predetermined shape. It is flammable, has easy mounting at the time of manufacture, and
also has dimensional stability after manufacture. Hereinafter, an embodiment of the present
invention will be described using a table and drawings. First, synthetic acrylic fibers spun from
an acrylic resin are woven into a base cloth. In this embodiment, a yarn having a thickness of 2
denier and a warp of 100 and a weft of 88 is used. If necessary, it may be dyed with a cationic
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dye. Next, as a thermosetting resin, for example, a methanol solution of trimethylol melamine
resin diluted to about 20 to about 30%, and as an organic phosphorus-containing nitrogen
compound flame retardant, for example, 30 to 40% of a phosphonic acid derivative having an
amide group The solution is mixed with some methanol dilution solution and the solution is
impregnated, for example, with the above-mentioned backing. Thereafter, the alcohol component
is dried from the above-mentioned base cloth with a hot air circulating drier or the like at 100120C. In this case, it is also effective to use a catalyst such as pure b (Im'amine system, for
example, triethyl amide specification without change), pressurized with 0.5 to 2.0 kli / cd if
necessary. It is.
The phosphonic acid derivative having the above-mentioned amido group is a derivative of
phosphonic acid and a condensed phosphoric acid alkyl ester derivative and is represented by
condensed phosphorus. In addition to the above-mentioned posponic acid derivative, a flame
retardant comprising guanidine sulfamic acid salt and a condensed phosphoric acid alkyl ester
derivative in combination is also processed, and 2- ° 2-bis 4-hydroxy-3.5digromophenylpropane or 2.2 -Flame retardants of phenolic resins such as bis 4-hydroxy ethoxo
3,5-dibromophenylpropane may be used. Tables 1 and 2 show the performances of the samples
of the backing fabric used for the speaker damper according to the present invention thus
obtained. Table 1 below shows the results of the combustion test according to the US UL method.
Table 2 shows a test piece in which a circular test piece in which the stretch ratio of the base
fabric is the longitudinal direction b1 and the lateral direction a is held in water for 2 hours and
then dried at 80C for 30 minutes, and the length in the longitudinal and transverse directions is
measured. Represents Table 1 shows the excellent flame retardancy conforming to UL-94 HF--,
and Table 2 shows that the base fabric has a very low stretch rate. Tables 3 and 4 show the test
results of the properties of the base fabric used in the present invention. The drawing is a crosssectional view of a speaker using the speaker damper 7 of the present invention. 7-a is a surface
view of the speaker damper according to the present invention. The damper 7 of the present
invention is shown attached to the plate 4 and holds the bobbin 6 with the voice coil 5 between
the magnetic air gap 13 between the pole piece 2 and the plate 40. In the above embodiment, the
flame retardant is adhered to the fiber by impregnation (without changing the contents) by
impregnation, but it may be mixed into the fiber at the time of spinning. Further, the
thermosetting resin is not limited to the melamine resin, and the same effect can be obtained
with, for example, a phenol resin modified product. As described above, according to the present
invention 1, according to the present invention, a thermosetting resin and an organic
phosphorus-containing nitrogen compound based flame retardant are adhered to a base fabric
made of synthetic acrylic fiber, and then they are dried and molded to form a flame retardant and
dimensionally stable. The damper for t'Lfc speaker with superiority is obtained. The damper for
the speaker is an industrial value that prevents the disconnection of the voice coil due to dust
and the deterioration of the characteristics and sound quality of the speaker, etc. The high Fine
book (No change in contents) Table 2 2) Measurement after drying for 30 minutes at 80C 3 t
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after purification 3 specification (Table 4 not changing in contents
[0002]
Brief description of the drawings
[0003]
The drawing is a cross-sectional view of the speaker.
7-a shows a part of surface view of the damper for speakers of this invention. Explanation of
symbols of major parts 1 · · · Bank plate 2 · · · Pole piece 3 · · · Magnet 4 · · · plate 5 · · · voice coil 6
· · · Bobbin 7 · · · · · · · · · Danano Part 8: Diaphragm 9: Center cap 10: Etch 11: Frame 12: Gasket
13: Magnetic air gap (one person) procedure "Indication of the case" Patent application No.
219192 No. 2 of 1984, Damper 3 for the name of the invention, relationship with person making
correction Patent applicant's residence Meguro-ku Tokyo Meguro 1-4-1 @ Name (501 ) Pioneer
Co., Ltd. (1 person) 4, agent 〒 104 residence Ginza 3-chome, 10-9, Chuo-ku, Tokyo, date of
correction instruction February 28, 1976 (shipping date) 6, increase due to correction Number of
inventions 1) page 4, 6 summer, page 7 and page 8 (2) in the specification, “4. Brief description
of drawings” in the specification (3) Details of the amendments (1) As attached on a separate
sheet (2) Correct the description cylinder on page 9, line 2 "Drawing" and correct it with Fig. 4
and insert "[Fig. 2]" in front of [7-aJ] Do. (3) Correct the drawing like a brush of the attached
drawing.
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