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JPS5480115

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DESCRIPTION JPS5480115
Description 1, title of the invention
Loudspeaker diaphragm manufacturing method
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a loudspeaker diaphragm. Conventionally, as a diaphragm for a loudspeaker, it is
desirable that the frusto-conical shape has a large Young's modulus in the vicinity of the top and
a small Young's modulus in the periphery. Therefore, pressure is applied near the top of the
frusto-conical diaphragm, and pressure is gradually reduced as it approaches the periphery, so
that pressure is applied weakly to the periphery, the upper and lower sides of the mold are
aligned. There is a method of gradually changing the gap and pressing dry with a heating mold,
but in this method, if the mating gap is taken large at the periphery, the degree of heat transfer is
not constant, so the top is dried, In the peripheral area, there is a problem that drying is not
sufficiently performed, and when the peripheral area is sufficiently dried, a problem in that the
top is easily burned is generated. Thus, the Young's modulus of each portion of the diaphragm of
one embodiment obtained from this method has the following numerical values as a result of
experiments. Top vicinity 1. When it is incorporated into a speaker in the vicinity of 0-9X10 "0"
"7 G, H in the vicinity of OX1010d voice 4 series, it becomes difficult to reproduce a wide range
from a low range to a high range, and only a narrow range can be reproduced. The present
invention is a method of manufacturing a diaphragm capable of obtaining a wider reproduction
sound range by extending the low range and the high range dramatically. This will be described
with reference to the embodiment shown in the drawings. (A) As shown in FIG. 1, EndPage: 1
until the mid-part until reaching the middle part from near the top and from the top to the
peripheral part of the frustoconical diaphragm 3; The upper mold 1a and the lower mold 1b of
the heating mold 1 are in close contact so that they can be directly compressed and dried
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uniformly. (B) A portion of the upper mold 1a of the heating mold (1) is scraped off as shown in
FIG. 1 from the periphery and the periphery of the frusto-conical diaphragm 3 to the middle part,
as shown in FIG. An air gap 4 is provided between it and 1b to prevent direct compression
drying. (C) Along the periphery of the frusto-conical diaphragm 3, the upper mold 1a and the
lower mold 1b of the heating mold 1 on the same position are perforated with a large number of
5, 5 ', and the upper mold Hot air 2 by heated compressed air is blown from the upper part of 1a
so that it can pass through the accumulation of paper fibers, pass through the holes 5 'of the
lower mold 1b, and can be discharged. When manufacturing using the heating mold 1 as
described above, the vibrating plate 3 having a hydrated conical shape in the water-containing
state, which has been milled up, is made of the upper mold 1a and the lower mold 1b of the
heating mold 1 as described above. When the hot air 2 of the heated air compressed and
compressed is sent from the upper part of the upper mold 1a through the hole 5 while squeezing
between the upper mold 1a, It is compressed and dried with a direct heating mold (1), and
simultaneously (this area from the peripheral part and the peripheral part to the middle part is
compressed with hot air 2).
The diaphragm obtained by the above method has a large Young's modulus at the top and the
vicinity of the top of the frusto-conical shape and a small Young's modulus at the periphery and
the vicinity thereof. The Young's modulus of the following numerical value was obtained as an
example of the diaphragm obtained by the above manufacturing method. 1 near the top of the
odyne 1. In the diaphragm obtained according to the present invention, the paper fiber is tightly
pressed by the heating mold l in a water-containing state with the top and the vicinity of the top
of the frusto-conical shaped diaphragm. Since the tightness is strong, the Young's modulus
becomes large, and when incorporated into a speaker, the high range reproduction limit fh
becomes high, and the sound pressure in the high range improves. In addition, the peripheral
area and the vicinity of the peripheral area keep the paper fiber structure, and since the moisture
evaporates without being pressurized by the mold, the Young's modulus becomes significantly
smaller than that near the top, so the speaker's minimum The resonance frequency fo is lowered,
and the reproduction of the low frequency band is also significantly improved. The present
invention is a method of manufacturing the diaphragm 3 as described above. The present
invention skillfully combines a method of compression-drying and molding with a heating mold
and a method of compression-drying and molding with heated compressed air to achieve an
unprecedented wide reproduction range. It is a manufacturing method of a diaphragm from
which a loudspeaker is obtained.
4, a brief description of the drawing Fig. 1 shows the heating mold α) This drawing 1 shows the
heating mold 1a, the upper mold 1b, the lower mold 2, the hot air 3, the diaphragm 4, Void 5: 5
'is a hole-Patent applicant Onkyo Co., Ltd. A11 氾 EndPage:2
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