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JPS57178785

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS57178785
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a speaker according to
an embodiment of the present invention, FIG. 2 is a soil plan view of a diaphragm of the same
speaker, FIG. 3 is a perspective view of reinforcing fins, FIG. Fig. 5 is a frequency characteristic
diagram, Fig. 5 is a half sectional view of a speaker according to another embodiment, Fig. 6 is a
soil plan view of a diaphragm of the speaker of Fig. 5, and Fig. 7 is a first diagram of the same
diaphragm. Soil plan view of the modification, FIG. 8 is a soil plan view of the second
modification, FIGS. 9 and 10 are perspective views of reinforcing fins of another example, and
FIGS. 11 and 12 are further different FIG. 16 is a perspective view of a reinforcing fin of the
example of FIG. DESCRIPTION OF SYMBOLS 10 ... Diaphragm, 11 ... Conical foam, 11 square ...
Central part, 11 degrees ... Outer peripheral part, 12 ... Metal plate, 13 degrees 14, i5 ...
Reinforcing fin.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for a
speaker using foam. The diaphragm, which is conically formed by continuous foam, can be
provided with a voice coil at its conical top, and the conical bottom can be a sound emitting
surface, thus utilizing the magnetic circuit and frame for a conventional conical diaphragm. The
characteristics of the flat diaphragm can be exhibited, and since the internal loss 8R (I, +, A'7LN,
p loss is large, resonance at the time of shifting to divided vibration can be suppressed, and it is
further lightweight Therefore, it is characterized in that the response is good, the manufacture is
easy, and it can be realized at extremely low cost. However, on the other hand, the foam is weak
in strength and has a low elastic modulus, so that there is a problem that the high sound
reproduction limit frequency is low and thus the reproduction frequency band is narrow. An
object of the present invention is to provide a speaker diaphragm using a foam in which the foam
is reinforced so that the high sound reproduction limit frequency can be increased and the
reproduction frequency band can be expanded. Hereinafter, the present invention will be
described in detail by way of examples. The first factor is a view showing a half cross section of
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the loudspeaker according to one embodiment, which is formed by the ball yoke 1 and the top
plate 2 so as to hold the magnet 3. The O magnetic circuit 4 and the voice coil 5 are wound, and
the mourning povin 6.7 lam T, the damper 8, the edge 9 and the like are the same as in the case
of a general speaker, so the details will be omitted. 10 is a diaphragm, a conical foam 11 made of
a continuous foam such as foamed styrene or urethane, a metal plate 12 stuck in a cone shape so
as to cover the outer slope of the conical foam 11, and conical foam It consists of a plurality of
reinforcing fins 13 embedded integrally in the interior of the body 11 when the conical foam 11
is formed. As the material of the metal plate 120, a hammer, a rubber, etc. are conceivable.
However, it is not particularly limited to metal, and any metal having properties such as easy
molding, high rigidity and light weight may be used. Further, as a material of the reinforcing fins
13, a material which is light in weight and has a large elastic modulus, such as a material in
which carbon fiber or glass fiber can be mixed in an epoxy resin, a metal such as 91j 'boron or
beryllium, is used. The frequency characteristic of the speaker using the diaphragm 10 as
described above is shown in FIG. 4B. The characteristic is the characteristic when the diaphragm
10 shown in FIG. 1 is formed only of the conical foam 11. As is clear from this figure, B has a
significant increase in the treble reproduction limit frequency with respect to "m", and the
reproduction frequency band is greatly expanded. This is a result that the conical foam body 11
is totally reinforced by the metal plate 12 and the reinforcements / 13 and K, and the overall
specific elastic modulus (the publication ρ is greatly improved).
In FIG. 5, the conical foam 11 is separated from the central portion 11. And the outer peripheral
portion 118 are formed in advance, and are attached and integrated at the time of post-assembly.
In this case, the diaphragm 10 as shown in FIG. 6 is embedded only in the reinforcing fin 14 gold
outer peripheral portion 11 o shown in FIG. The reinforcing fin 15 shown in FIG. 6 is an am
board 10 shown in T.sup.th in which only the central portion 11 @@ is embedded, or b is an
outer peripheral portion 11.b. And the central part 11. In this case, it is possible to embed the
reinforcing fins 14.15 so that the fins 14.15 are not continuous and to form the diaphragm 10
shown in FIG. The diaphragm 10 shown in FIGS. 6 to 8 described above is suitable for adjusting
the frequency characteristics to desired characteristics by using the reinforcing fins 14.15. 11
shows that a plurality of holes 141L are formed in the reinforcing fin 14, but 01 FIG. 12 shows
that the holes 15 & of the number of III are formed in the reinforcing fin 15). In this way, the
center of the conical foam 11 is obtained. At the time of molding of the portion 111 and the
outer peripheral portion 11 ° 89.4 フ ィ ン, the reinforcing fins 14.15 are embedded more
strongly in them. As described above, in the diaphragm according to the present invention, the
metal plate is adhered to the outer slope of the conical foam and the holding fin is embedded
therein, and thus the conical foam is reinforced. The whole elastic modulus is thick, and the
reproduction frequency band can be expanded. 4, simple of drawing! FIG. 1 is a half sectional
view of the speaker according to an embodiment of the present invention, FIG. 2 is a half plane
view of the diaphragm of the same speaker, FIG. 3 is a perspective view of a reinforcing fin, and
FIG. Fig. 5 is a half sectional view of the speaker according to another embodiment, Fig. 6 is a
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plan view of the diaphragm of the loudspeaker in the Whs diagram, Fig. 7 is a plan view of a first
modification of the same diaphragm, 8 to 14 are core surface views of the second modification,
and FIGS. 9 and 10 are perspective views of another example O reinforcing fin, and FIGS. 11 and
12 The figure is a perspective view of a further example of a reinforcing fin. 10: Diaphragm, 11:
Conical foam, 111: Central part, 11. ... outer periphery, 12 ... metal plate, 13 ° 14.15 ...
reinforcement fin. Utility model registration Bio-A Co., Ltd. Applicant agent Hideo Hino x 5 955!
# 6C Fig. 1 Fig. 2 13 13,. 11 /: · · y: 7: ') = / 07 toss / γ-'71 what · · · · "" 3 protection X154i · □ 3
Figure 30 Figure 4 "坪 id B + pIL @ I Hz) utility model registration Applicant Pioneer Corporation
1'c '?
85 □ b ′ Agent Hideo Hino J Sita 21. (Architecture FIG. 5 FIG. 60; \ 14111) ,, "" "," 1th l'h "[2] ..
\\ 9, \: \ 1 14 14th factor Fig. 8/10112 /- 511112515'141: Utility model applicant / f-i, 1- = y
Inc. '-,'; ',' QR-Wu agent Hideo Ogino rpp, tb h2 ninth cause 10 @ Z--11th Fig. 12 [[Rolled 150P
14 ° 4151 べ be rs, ≦ agent wetted area! -Male
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