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JPS5658397

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DESCRIPTION JPS5658397
Specification 1, Name of the Invention Foamed Resin Filled Diaphragm t A diaphragm having a
driving body at the top of a cone and the foam resin body filled in the cone. The foamed resin
body comprises relatively high density, high stressed one and low density, low stressed one, both
of which include a portion which causes buckling on the side near the root of the cone, or The
present invention is characterized in that it is filled in layers on the entire inner peripheral
surface, and the latter is filled in the remaining part of the cone in the present invention. Related
to the shooting board. In the conventional foam resin-filled diaphragm, one type of foam resin
was filled inside the imaging plate. Therefore, when the filling resin has a relatively low density
and low stress, when a relatively large acceleration is applied to the diaphragm from a voice coil
or the like which is a driving source, the co / tends to buckle together with the foam resin, In
addition, in the case where the filling resin has a relatively high density and a high stress, there is
a disadvantage that the mass of the diaphragm becomes large. When the cone itself is thickened,
the same result as the latter is obtained. However, the above-mentioned buckling phenomenon
does not occur uniformly over the entire cone, nor does it occur at any specific place, and it is
near the base of the cone (about 10-of the radial length of the cone It is easy to concentrate on
the position). This is also apparent from the fact that it is recognized as root stiffness. An object
of the present invention is to eliminate the above-mentioned disadvantages of the prior art, and
to provide a foamed resin-filled diaphragm which is high in stress but causes less increase in
mass and is less likely to cause buckling. In the present invention, in order to achieve this object,
in a diaphragm having a driving body at the top of a cone and a foam resin body filled in the
cone, the foam resin body has a relatively high density and high stress And low density, EndPage:
one with low stress, the former includes a portion that causes buckling on the side near the root
of the cone, or is packed in layers on the entire inner circumferential surface in the cone The
latter is intended to fill the remaining part in the cone. Hereinafter, the present invention will be
specifically described according to an embodiment shown in the drawings. FIG. 1 is a schematic
cross-sectional view of one embodiment of the foamed resin-filled diaphragm according to the
present invention. In the figure, 1 is a cone, 2 is a bobbin which is a drive body attached to the
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top of the cone 1 and 3 is a voice coil wound around the 2. The buckling of the cone usually
occurs at a position of about 10-about the generatrix length of the cone near the root of the cone,
for example, at a position of about 10 か ら from the root with a cone of generatrix length 1
Therefore, in the present embodiment, the above-mentioned buckling occurrence position is
included, and a relatively high-density, high-stress foamed resin 4't inside the cone 1 between the
root and the root other than the cone's skewed part The inside of 1 # is filled with a relatively
low density, low stress foamed resin 5.
Since the diaphragm of this embodiment is configured as described above, when it is driven by
the cone 1t-voice coil 3 with an extremely large acceleration via the bobbin 4; As a result, high
stress is generated inside the high density, high stress foamed resin 4 with respect to the
sagging, so that the resin 4 itself and hence the portion 1 'near the base of the cone 1 can
withstand buckling. Moreover, the increase in mass as a whole is not so great. In the abovedescribed embodiment, the foam resin 4 with high density i and high stress is filled in a
truncated cone shape 1 'in the vicinity of the root of the cone 1, but the entire inner peripheral
surface of the cone 1 is Over the length of the bus bar length of the cone 1 may be filled with the
high density, high stress foamed resin 4 and the remaining part of the core 71 may be filled with
the low density, low stress foamed resin 5 . In this way, the entire cone is less likely to buckle.
Also, as shown in FIG. Fill the high density, high stress foam resin 4 only in the peripheral cone 1
except for the top of the bottle 20, and fill the low density, low stress foam resin in the remaining
part of Co / 1. May be In this way, a diaphragm with a relatively high stress can be obtained with
a relatively small mass gain. As the foamed resin which can be used in the present invention,
those having various densities and four stresses are commercially available, but in the above
examples, among the commercially available hard foamed polyurethane resins, those having low
density and low stress As a density 10 to # / 'l + compressive strength 800 # / Ml', as high
density, high stress, density 20 to @ / j, compressive strength 8000 and density 50 kJ / IN,
compressive strength Good results were obtained using 21000-. As described above, since the
foamed resin-filled diaphragm of the present invention 9 was filled with a foamed resin having a
relatively high density and high stress only in a portion close to the root of the cone as described
above, it is relatively large with a relatively small mass increase. There is an effect that a
diaphragm capable of emitting sound pressure can be obtained.
4. Brief description of the drawings Figs. 1 to 3 will be sectional views of an embodiment of the
present invention-in the figure 1: cone 2: bobbin 3: voice coil 4-: high density, high stress foamed
resin 5 Low density, low stress foaming resin EndPage: 2 o 醜 j, +2 country 3 m End Page:3
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