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The diaphragm according to the invention is formed by applying or impregnating a resin onto a
diaphragm substrate and curing the diaphragm, wherein all or part of the resin is an alkyl
resorcinol resin.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm used
for a speaker or the like. Heretofore, for example, a diaphragm made by impregnating a substrate
such as cloth with a phenol formaldehyde resin, or a diaphragm made by impregnating and
curing a phenol formaldehyde resin in a paper has been used as a carrier plate for a speaker.
However, phenol formaldehyde resins have the following disadvantages. fi + high curing
temperature (usually 160 C to 180 tl '). (2) The curing time is long and the manufacturing
workability is poor. For example, depending on the thickness, it takes about 5 minutes in the case
of a thin diaphragm, and 20 to 30 minutes in the case of a thick woofer. (3) The unreacted 7-enol
monomer is also present in the cured resin, which causes a problem of corrosion of parts of the
speaker, particularly metal parts. SUMMARY OF THE INVENTION In view of the above-described
points, the present invention solves the above-mentioned drawbacks by using a new resin
replacing conventional phenol-formaldehyde resin, and provides an excellent diaphragm having
high strength and high productivity. The present invention is a diaphragm made by applying or
impregnating a resin to a base material such as paper, cloth, non-woven fabric, or knitted fabric
and then curing it, and using a full-kil resorcinol resin for all or part of the resin. . Since the
alkylresorcinol-based resin expansion characteristics are almost the same as the phenol resin, it
can be easily replaced with the phenol resin, and the productivity can be greatly improved. The
results of comparison of the curing conditions and the paper properties with the paper
impregnated with flukil lesorcinol resin and impregnated with meta paper and resole phenol
formaldehyde resin are shown below. A, Paper based on softwood bleached sulfite pulp
(abbreviated NB-8r; EndPage: 1 freeness 20 ° SR) K. B, Softwood bleached sulfite pulp
(abbreviated NB-8r; tap Ps degree 20 ° 8R) K impregnated with resol-type phenol formaldehyde
m fat vso% (to pulp) on paper. Curing conditions ..... 180 'C, 15 minutes C 0 Softwood bleached
sulfite pulp (abbreviated NB-8P; beaten [20 ° Si'L) Ic to paper based on alkyl resorcinol resin
(Nagoya Oil Chemical Industry Co., Ltd.) 50% (as opposed to pulp) impregnated with
formaldehyde added as a DFK-INKK curing agent. Curing conditions 1 Dissipation-100 tl ', 30
seconds Young's modulus of the above three types of paper (A), (B) and (C) is as follows. Paper
(A) -se @ sQ, 98 × 10′N / m 2 M (B) @ am @@ 1.48 × 10 N / n 1 Paper (C) -Fist -1, 60 × 10 N
/ n 12 In this manner, alkyl resorcinol resin is a phenolformaldehyde resin Compared to the
above, the curing temperature can be greatly shortened.
Also, Young's modulus is larger when using a dialkylformalcinol resin than when using a phenolformaldehyde resin. In addition, since alkylresorcinol resin can be used to lower the curing
temperature of the diphenolformaldehyde resin and shorten the curing time as well as when it is
used alone, it is possible to reduce the curing temperature of the diphenolformaldehyde resin. It
is also possible to use it in combination with a resin. On the other hand, the figure shows the
sound pressure frequency characteristics of a dome-shaped speaker using the paper (B) (phenol
resin impregnated) and the paper (C) (alkyl resorcinol resin impregnated) as diaphragms
respectively. In the figure, the solid line (1) is when paper (C) is used, the broken line (II) is when
paper (B) is used, and according to the speaker, the alkylresorcinol resin is used according to the
present invention. , Loudspeaker when using phenol formaldehyde resin) It is recognized that the
high region is extended. According to the present invention to be described above, after applying
or impregnating a resin to a substrate such as paper, cloth, etc. and then curing the diaphragm,
use an alkylresorcinol resin as the resin. The curing temperature is low, for example, even at
room temperature, and the curing time can be significantly shortened, and the curing time can be
shortened even if it is added to a phenolic resin. You can raise it. Moreover, since there are few
unreacted upper claws, the durability-pressure is excellent, and the problem of corrosion to other
metal parts of the speaker is also small. In addition, the sound pressure frequency characteristic
is advantageous because the Young's modulus is higher than that of the conventional diaphragm
using a phenol resin. Therefore, when the diaphragm according to the present invention is
applied to a speaker, the speaker characteristics can be remarkably improved along with the
improvement of the productivity.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing sound pressure frequency
characteristics of a loudspeaker using a diaphragm according to the present invention and a
loudspeaker using a conventional imaging plate according to the present invention. Torisaka
(HAF)-EndPage: 2
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