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The present invention relates to a diaphragm for a speaker. ??? LJL Generally, for a speaker, a
diaphragm is required to be lightweight, rigid and have a suitable internal loss. In particular, a
diaphragm made of paper is widely used for speakers because of its good processability. FIG. 1 is
a view showing a cross section of a cone type of such a speaker. The magnet 1 is held between
the upper plate 2 and the lower plate 3, and the center pole 4 is mounted on the lower plate 3,
thereby forming a magnetic circuit. A voice coil bobbin 11 on which a voice coil 6 is wound is
coupled to the diaphragm 5 at the opening end of the recess, and a center cap 15 is mounted.
The opening edge of the diaphragm 5 is supported with the gasket 10 via the edge 9 at the tip of
the frame 8 fixed to the upper plate 2 and the recess opening end of the diaphragm 5 is fixed to
the frame 8 7 is supported via the bobbin 11 of the voice coil 6. In the speaker, various attempts
have been made to make the diaphragm incombustible for use in a portion where the voice is
generated due to excessive input or exposed to high temperature such as a television cabinet.
However, conventionally, as a material of the diaphragm, a material obtained by coating and
impregnating a resin with paper or a mixture of paper with a flame retardant fiber has been used,
and in any case, there is a disadvantage of making the diaphragm itself heavy. In addition, since
paper, which is a flammable material, is used, it has been difficult to achieve both flame
retardancy of the speaker and misrepresentation of the diaphragm. Therefore, it can be said that
the measures for the flame retardancy of the diaphragm were insufficient for the entire speaker.
Conventional flame retardants for speaker diaphragms include boric acid, boron compounds,
halogen compounds, phosphoric compounds and the like. Boric acid and boron compounds have
high hygroscopicity, which significantly deteriorates the moisture resistance of the product.
Halogen-based compounds themselves are weak in imparting flame retardancy to paper and can
not be effective unless they are adhered between the streaks. Thus, the use of these flame
retardants made the diaphragm heavier. Phosphoric acid compounds have a flame retardant
effect on paper, but their decomposition temperature is low. For example, if the diaphragm is not
usually formed at 200 ░ C or higher, it will be difficult to maintain its shape. Since the molding
temperature and the decomposition temperature of the phosphoric acid-based flame retardant
are in almost the same region, their use is made difficult. In addition, halogen-based flame
retardants have the problem of generating toxic gases at the time of ignition. SUMMARY OF THE
INVENTION The present invention is to provide a speaker diaphragm having a light weight and
sufficient flame retardancy.
The speaker diaphragm of the present invention is characterized in that the paper stock is
impregnated with a solution of a water-soluble or alcohol-soluble cyanamide derivative salt, dried
and then heated and pressurized to be formed into a predetermined shape. The present invention
will be described based on the corrected drawings and tables below. In the present invention, the
compound having a high decomposition temperature> 7t'A H '! ????? ???????
?????? ???? 1 (tsx JK e Th 1 By using a derivative with an atomic group, the
synergetic effect of flame retardancy is raised, and a flame retardancy that is good with a small
amount of adhesion is imparted to the speaker diaphragm. Although cyanamide is represented by
NG-NHz, examples of this derivative include guanidine of the following formula and the like. HNC
(NH2) 2 When it is used in the form of a salt of this with phosphoric acid, for example, a salt of
guanidine phosphate or guanidine phosphate or sulfamic acid, the decomposition temperature is
high, and the synergistic effect of phosphorus and nitrogen or sulfur Favorable flame retardancy
can be obtained with a smaller adhesion amount. In addition, since cyanamide has a small
hygroscopic property and exerts a flame retardant effect with a small amount of adhesion, the
speaker diaphragm in the present invention is also excellent in moisture resistance. In addition,
according to the acute toxicity of the salt of sulf-1-amic acid guanidine according to the industrial
drainage test method of J, 15K- 0102, the survival rate after 7 hours of 7 ooo ppm is 100%
according to the acute toxicity by The survival rate after 24 hours in the same test was 100% at
2500 ppm. These flame retardants have no problem in their acute toxicity, and because they are
flame retardants by dehydration of phosphoric acid and sulfamic acid, no harmful gas is
generated at the time of ignition. Application Example 1 A speaker diaphragm is manufactured.
First, a product is prepared by refining NBKP and adjusting the beating degree to 20 degrees SR.
Thereafter, the resultant is dispersed in a paper making tank to form a suspension, and paper
making is performed with a paper making net of a desired shape. At this time, it is carried out at
a ratio as shown in Table 1 as a raw material. After paper making, it is dried. Thereafter, the
obtained stock is immersed in a predetermined concentration of an aqueous solution of
guanidine phosphate (may be an alcohol solution), and the attached amount of guanidine
phosphate is 3% to 15%, preferably 7% to 8%. I will do it. Let dry again. Thereafter, it is formed
into a predetermined shape. Table 1 NBKP 20 ░ SR 100% urea sizing agent 3% direct dye 4%
fixing agent 1.5% Application Example 2 A stock is made into a stock with the same raw material
configuration as in Application Example 1 and dried.
Thereafter, methylol melanin resin is adhered to the stock by impregnation. At the same time, it
is molded into a predetermined shape. At this time, it is possible to make the 2-guanidine
phosphate and the methylol melanin resin ? into the same aqueous solution or allyl solution.
The cyanamide derivative in the present invention has a flame retardancy determined by the
amount of adhesion to paper, and is not influenced by the concentration of the impregnated
aqueous solution. After the paper is impregnated with paper, the amount of adhesion can be
adjusted by squeezing with a roll or the like. The speaker diaphragms obtained in the application
examples 1 and 2 were all flame-retardant equivalent to UL 94 V-0. Also, the diaphragm of the
present invention and the conventional diaphragm are similarly assembled in a speaker and their
frequency characteristics are compared. As shown in FIG. 2, the frequency characteristic curve B
of the speaker using the diaphragm of the present invention and the frequency characteristic
curve A of the speaker using the conventional diaphragm not subjected to the non-combustible
treatment are almost the same. I understand. The formula of the cyanamide derivative used for
the above-mentioned application example is as follows. Phosphoric acid 1 guanidine HNC (NH2)
2 H3 POa phosphorus li 2 guanidine (HNC (N to L)) 2 H 3 PO 4 sulf 1 monobasic guanidine HNC
(NH 2) HS O 3 NH 2 In the present invention, the flame retardant treatment is limited to paper
The present invention is also applicable to other natural fibers or woven or non-woven fabrics
made of chemical 111 + H. In particular, non-combustible or flame-retardant I made of metal
fibers, carbon fibers, glass fibers, synthetic fibers, etc. I! It has been confirmed that the flame
retardant treatment according to the present invention is also effective in the case of a paper
stock made by mixing paper so that the fiber is contained in the paper stock. For example, it can
be applied to a vibration plate such as wood pulp. ???? Paper, 7 <1.7 equal powers, six. In
the case of the diaphragm 7), using a water-soluble one-impregnant may cause deformation or
the like. Therefore, in this case, it is necessary to apply a sizing agent in advance. Further, the
flame retardant may be impregnated and heated and pressurized by a mold or the like after
application. The molding of paper in the present invention can be used not only for the
diaphragm of the speaker, but also for example, a center cap using paper. The speaker
diaphragm of the present invention obtained in this manner is rigid because it uses paper or the
like as a material, and has appropriate internal loss, and is suitable as a diaphragm. Moreover, it
has the outstanding flame retardance corresponded to UL94V-0. Furthermore, since the
cyanamide derivative has little moisture absorption, the flame-retardant diaphragm obtained
does not deform due to moisture absorption and can maintain the shape of the diaphragm in a
stable state, so that its frequency when assembled into a speaker A stable and light diaphragm
which does not affect the characteristics can be obtained.
And, as described above, since it has an excellent degree of flame retardancy, even if a speaker is
placed in a high temperature area near the power supply unit such as a television radio, the risk
of ignition is greatly reduced as compared with the conventional one. In addition, since guanidine
phosphate and guanidine sulfamate are nontoxic and harmless to the human body when used, no
special ventilation equipment etc. are required in their production.
Brief description of the drawings
FIG. 1 is a partial cross-sectional view of a cone type speaker, and FIG. 2 is a graph of a frequency
characteristic curve of a speaker using a diaphragm according to the present invention.
Explanation of symbols of main parts 1 иии Magnet 2 и и и и Upper plate 3 и и и и и Lower plate 4 и и и и и
Center ball
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