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JPS54113324

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DESCRIPTION JPS54113324
Item jjl, the name of the invention
Support of diaphragm in loudspeaker
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker,
and in particular to the support of a diaphragm in the loudspeaker. The figure shows an example
of a cone speaker. Reference numeral 1 denotes a back plate. A pole piece 2 is placed at the
center of the back plate, and a magnet 3 is placed at the periphery. The plate 4 is placed on the
magnet 3 to form a magnetic gap with the pole piece 2. A voice coil bobbin 6 carrying a voice
coil 5 is vibratably inserted into the magnetic gap and supported by a damper 7. A diaphragm 8
is coupled to the voice coil bobbin 6 at its central hole, and a center cap 9 is further crowned.
The opening peripheral edge portion of the diaphragm 8 is supported by the frame 11 via the
edge 10. The edge 10 is further secured to the frame 11 by a gasket 12. The lead wire of the
voice coil is connected to the terminal 14 provided on the side of the frame 11 through the tinsel
wire 13. In such a speaker, the damper 7 and the edge 10 are important as a central support for
correctly mounting the voice coil 5 at the center of the gap and correctly vibrating the diaphragm
8. In particular, the damper 7 is required to have an appropriate internal loss that does not
resonate with the vibration of the diaphragm 8. As a material of this support, a cotton cloth or
the like coated with or impregnated with vinyl, rubber or resin has been used. However, a
support made of a material which is EndPage: 1 is flammable, and it has been difficult to make a
flame-retardant speaker Kl. Therefore, the object of the present invention is a flame retardant
speaker with damper and edge of sister j silent PI? CJ、 11. It is to offer. In the present
invention, a flame retardant containing an alcohol-soluble organophosphorus nitrogen compound
as a main ingredient is applied or impregnated to a cotton cloth, and the cotton cloth is dried and
then heat-molded to obtain a flame retardant support, that is, a damper and an edge. As such a
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flame retardant, it is possible to use 171% by weight of phosphorus, 77% by weight of nitrogen,
40.0% by weight of methanol and a content of 648% by weight of hydrogen and hydrogen, which
are commercially available. In addition, by mixing an alcohol-soluble phenol resin with the flame
retardant, it is possible to obtain a flame-retardant support which is more excellent for the effect
of preventing the detachment of the flame retardant and the like. Hereinafter, a method for
producing such a flame retardant support will be described. First, a mixed solution is prepared at
a ratio (volume) of, for example, alcohol: organophosphorus nitrogen compound, alcohol-soluble
phenol resin, and alcohol serving as a solvent, such as methanol: 1: 4.
By appropriately changing this mixing ratio, a support having a desired degree of flame
retardancy and hardness can be obtained. After the mixture is applied or impregnated to a cotton
cloth, the cotton cloth is dried, for example, under conditions of 50 ° C. and 60%. Thereafter, a
flame retardant damper and an edge are obtained by heat-forming a cotton cloth under
conditions of, for example, a heat-forming temperature of 240 ° C., a press pressure of 5 kg /
crl, and a forming time of 7 seconds. In this case, the adhesion amount of solid content of organic
phosphorus nitrogen compound and phenol resin to cotton cloth is 576 gr / W? It is an extent.
Generally, when making a cotton cloth etc. flame-retardant, the method of apply ¦ coating or
impregnating a heat-resistant agent, or the method of obtaining a flame-retardant cellulose by a
chemical reaction is used. However, in the former case, the flame retardant may be detached by
washing with water, etc. In the latter case, the reaction must be made at a high temperature of
about 140 ° C., which causes the deterioration of cellulose. And phosphoric acid-based cellulose
etc. itself is inferior in strength to light cellulose. 5 In the present invention, since the solvent is
used as a solvent, I.-le, it is possible to carry out a flame-retardant treatment while maintaining
the form even in the case of a water-based cotton cloth which is easy to expand in an aqueous
system. The time required is also shorter than the water system. Still, by using a phenol resin in
combination, it is possible not only to improve the thermal processability and the moisture
resistance but also to prevent the release of the flame retardant. In particular, in combination
with the crosslinking reaction of the phenol resin after the heat molding, not only the moisture
resistance but also the alcohol resistance is improved, and the detachment of the flame retardant
is prevented. Therefore, there is no change in characteristics due to moisture absorption and the
like, and a favorable flame-retardant support of the diaphragm can be obtained. The damper and
the edge thus obtained are suitable as the flame-retardant support of the diaphragm because
they have a high Young's modulus and an appropriate internal loss. In addition, such a support is
excellent in moisture resistance, and therefore rust or change in shape due to moisture
absorption is frequent. Furthermore, such a support does not flame and burn because fibers such
as cellulose are carbonized or degraded before reaching one ignition point. Therefore, even if the
flame-retardant speaker having such a support is disposed in the vicinity of the power line of a
device such as a television or radio, there is no concern.
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4, a simple explanatory diagram of the drawing is a cross-sectional view of the speaker.
Description of the sign of the main portion 7 ......... damper 8 ......... diaphragm 9 ......... center cap
10 ........・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Gasket EndPage: 2
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