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Speaker 2 Inventor 3 Patent applicant address Osaka Prefecture Kadoma city Ogata Kadoma
address 1002 Name (582) Representative of Matsushita Electric Industrial Co., Ltd. Shoji
Matsushita 4 Agent 〒 517 Address Osaka Prefecture Kadoma city Osamu Kadoma address 1006
■ Japan Patent Office ■ Japanese Patent Application Laid-Open No. 52-6761.3 (76 ,! ;f、!
Ming, letter 1, title of invention
3. Detailed Description of the Invention The present invention relates to a speaker using a heatresistant fiK, high rigidity, and a diaphragm, and to improve its characteristics. Recently, various
electric machines 11 are obliged to take measures against KII combustion to prevent fire
accidents □, 0 This is a sound box equipped with a speaker 1) The same is true for K bowls, as
well as the fire resistance of cabinets, the fire resistance of speakers themselves has to be
measured, and it has grown. As a conventional speaker of this type, there is a diaphragm made of
a heat-resistant glass cloth impregnated and molded with a phenolic resin. It is considered that
the ones with conical cones are obtained-that is, this is because the specific modulus is small and
/ p is small and that it is suitable as a diaphragm of a speaker that reproduces up to the bass
range. ★ There is also developed a paper that produces pulp fibers etc. and forms a layer of
flame-retardant material on the surface of a good vibration job as a cone proof, but the mass is
extremely large and the efficiency is low. The present invention will be described with reference
to the drawings 1 wA and 2 of the drawings of one embodiment below, which eliminates the
above-mentioned conventional defects. In the N1 diagram, the field s1 is constituted by a plate 3
provided with a dragon pole 2, a ring-shaped magnet 4, and an end page: a ring-shaped upper
plate 6 in the same manner. -. Although this field section 1 is referred to as "made from outside
a", it is possible to use an inner magnet in which a laminated body of a columnar magnet and a
pole piece is disposed in the yoke. A frame 6 is connected to the field portion 1, and the
peripheral edge of the diaphragm 8 together with the gasket 7 is fixed to the peripheral edge of
the frame 6 by an adhesive or the like. This diaphragm 8 is mainly composed of inorganic heat
resistant fibers such as rock wool, ceramic fiber, asbestos, etc., and a thermosetting resin such as
fetool resin is fixed thereto by neoprene latex in a beater, and after paper making The product
obtained by heating and pressing is to improve the heat resistance and the elasticity and to make
it non-air-permeable. (The fluorine-based compound 9 dissolved in the solvent is impregnated
with or sprayed with an imide amide-based heat-resistant paste. It is something which is
attached. The voice coil 9 is coupled to the lower surface of the central portion of the diaphragm
8, the middle portion of the voice coil 9 of the core is held by the damper 10, and the lower
portion of the voice coil 9 is eccentric to the magnetic gap 11 of the field portion 1. It comes to
be arranged correctly without it.
In addition, a dust cap 12 is attached to the upper surface of the central portion of the
diaphragm 8. Although the diaphragm 8 of the said Example was made into the conical wedge, it
is also possible to use it as a domed shop. Next, various characteristics of the lapping diaphragm
which is mainly made of pulp fiber and subjected to flame retarding and ripening, the
conventional diaphragm impregnated with phenol [i, and the diaphragm according to the present
invention will be described. [Young's modulus と and specific elastic modulus (K / #) IC x 7 p
bulk fibrillation vibration job 1.2 x 10 '' d 7 n / a J 2, 5 x 10-pheno- ^ 儂 ■ loss I 1.5 x 1010 #
1.2 x 10 '# invention Vibration @ 1.8 X 10 "# 2.9 X 10 '++ [heat resistance] Pulp fiber vibration @
200 ° C, carbonized deformation in 20 minutes, it becomes brittle-so it is difficult to use, 7-1-fk
@ fat Vibration 黴 soo ° C, carbonized in 20 minutes, but there is no problem in use, the present
invention diaphragm 300 ° C, carbonized in 20 minutes, but not in use, the diaphragm of the
present invention Is discolored due to carbonization of the binder, but there is no problem in use.
The sound pressure-frequency 1lII characteristic of the speaker manufactured for the low tone
and using the diaphragm of the present invention is as shown in FIG. 2, and can be stable from
the low tone range to the high tone range. As described above, not only the dome type for high
sound but also the conical diaphragm can be manufactured and the stable characteristics can be
obtained. Further, even in the point of heat resistance 9 is extremely excellent, and measures
against fire are sufficient, and it can be made extremely suitable as a speaker for audio
equipment for indoor use. As described above, the loudspeaker of the present invention is of
great industrial value.
4. Brief Description of the Drawings FIG. 1 is a half sectional view showing an embodiment of a
speaker according to the present invention, and FIG. 2 is a graph showing sound pressurefrequency characteristics of the speaker. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · voice coil, 11 · · · · · · · · magnetic gap. Name of the agent Attorney Nakao
Toshio and others 1 EndPage: 2 Figure 1 No. i6 Attorneys other than the above Address address
in Osaka Prefecture Kadoma city Oda Kadama 1006 Address EndPage: 3
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