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l1 specification 1, the title of the invention
For speaker, expansion board
3. Detailed Description of the Invention The present invention is intended to provide a speaker
diaphragm having excellent rigidity, heat resistance and solvent resistance. In the past,
lightweight foams for loudspeakers that are excellent in bending and distribution have been
developed using ABS foams and butyl acrylate methacrylate resin foams, but these are heat
resistant and solvent resistant. In recent years, however, speaker diaphragms using metal foam
have also been developed and put to practical use, but processing takes time and labor, which is
disadvantageous in terms of cost, and weight And was inferior in efficiency. The present
invention eliminates the above-mentioned conventional drawbacks. That is, the present invention
is intended to provide a lightweight speaker diaphragm that is excellent in heat resistance,
resistance to machinability (chemical resistance) K, and rigidity, and further that utilizes the
characteristics of a phenol resin. More specifically, (1) A phenolic resin material used in the
present invention comprises a novolac type phenolic resin as a main raw material, to which a
foam material, a curing agent and various additives are added, and it is kneaded and then
crushed to produce novolac type phenolic foam The resin powder binder, this novolak-type
foamed phenolic resin powder is uniformly foamed in a cone-shaped mold at 120 "C-130 C for
15 minutes or 150 '(:-160' (, for 7 to 8 minutes, It is cured to form the diaphragm 1 as shown in
FIG. 1 or 2, or the novolak-type foam end page: 1-Nole resin powder 2 is uniformly coated on the
light metal eraser 3 as shown in FIG. , Temperature condition that the novolak-type foamed
phenolic resin powder 2 melts or does not foam by heating roll or hot pressure press, ie,
pressure heating at 120 ° C. to 130 ° C. for 2 to 3 minutes , Fusing onto metal oil 3. This is
formed into a cone shape and pressurized and heated at a temperature of 160 ° C. to 160 ° C.
to foam the novolak-type foamed phenolic resin powder 2 fused to the metal sheath 3 as shown
in FIGS. 4 and 6 The diaphragm 4 is as follows. The diaphragms 1 and 4 made of novolak-type
foamed phenol configured as described above have a uniform open-cell portion 6 inside as
shown in FIG. 2 or FIG. Therefore, the film 6 has non-air permeability. Next, various
characteristics of the conventional speaker diaphragm using ABS foam and the speaker
diaphragm using the novolak-type foamed phenol of the present invention will be described.
[Example 1] Heat resistance and dimensional change characteristics ˜ -4 \ Test conditions-°120'e (7) Characteristic density after being left in a high temperature tank for 96 hours □ flJ
(□) Invention 0.350.08% Conventional example 0.3528.0% [Example 2] Solvent resistance test
conditions: Characteristics after immersion in gasoline for 24 hours The present invention: No
particular change Conventional example: Dissolving and shape change significantly.
[Example 3] Physical Properties of Diaphragm As described above, the portal board for a speaker
according to the present invention is excellent in heat resistance and solvent resistance, yet has
high rigidity, and can be made lightweight and inexpensive. Satisfying most of the properties
required as a 3-way sliding board. It is a dog of industrial value.
4. Brief description of the drawings. FIG. 1 is a half sectional view showing one embodiment of
the speaker diaphragm of the present invention, FIG. 2 is an enlarged sectional view of the same
part, and FIG. FIG. 4 is a half sectional view of the imaging plate for the speaker, and FIG. 5 is an
enlarged sectional view of the relevant part. 2 ······ Novolak-type foamed tunol powder, 3 °. ···
Metal foil, 6 ······································ Coating Name of agent Attorney Nakao Toshio is one person
Figure 1 Figure 2 Figure 3? Fig. 4 Fig. 5 NEndPage: 2