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JPS5763995

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DESCRIPTION JPS5763995
Specification 1, Title of the Invention Diaphragm for Audio Equipment On both sides or one side
of a flat porous body having a density or elastic modulus or both continuously or gradually
changing from the center to the periphery of the diaphragm. A diaphragm for acoustic
equipment, characterized in that a surface material is attached.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a diaphragm for acoustic
equipment used for acoustic equipment such as a speaker, and more specifically, the density and
elastic modulus are changed from the central portion toward the peripheral portion ( The present
invention relates to a diaphragm for an acoustic device having a surface material attached to one
side or both sides of a porous thin plate made E. Conventionally, in the diaphragm for an acoustic
device using a porous foam, changing the apparent density of one thousand of the foam
continuously in position within the diaphragm is embarrassing in terms of the manufacturing
method. The apparent density is constant at each part, ignoring the partial non-uniformity that
occurs in the construction root. Therefore, in the disk-shaped diaphragm having such a structure
which is generally used, the density and the elastic modulus of each portion are the same, so that
the vibration mode is as shown by a broken line in FIG. FIG. 6 is an explanatory view of various
vibration modes of the disk-like diaphragm, in which m represents the number of nodal lines to
be the diameter, and L represents the number of nodal circles to be the concentric circles. Among
the valley pregnancy modes, the (0, 7 L) mode (r L = Q, 1, 2 ...) in which concentric nodes can be
generated is a vibration called division vibration generated by a conventional cone-shaped
diaphragm It corresponds to the mode. Therefore, in the '#R moving plate, the frequency at
which the t-j: (011) mode occurs is the limit frequency of the piston vibration, that is, the highresonance frequency. Further, in the following Table I, the positions at which concentric nodes
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occur are shown as values when normalized with the outer diameter of the diaphragm being 1. If
the Poisson's ratio of the table 1 diaphragm is about α3 below, the margin EndPage: If the
frequency at which the (0, 1) mode occurs is jol and the frequency at which the (0, 2) mode
occurs is Mrf 02 The relationship between fo2 = 4.5 × fol is high, and the diaphragm should
have a high limit frequency as high as slightly <L ”(it is necessary to widen the piston vibration
range, so in general,“ mode ”is the mode A driving method is used to drive nine nodes of the
(0, l) mode of the diaphragm. This is because all vibration modes below (0, n) mode degenerate to
(0, l + 1. This is a method of widening the piston vibration area by utilizing the fact that only the
above mode is generated. In general, it is common to drive one in-path portion mainly in the (0,
1) mode to extend the piston oscillation region to the (0.2) mode which is about 4 times the
frequency. In this method, if the diameter of the disk-shaped diaphragm is determined, the
diameter of the driving diameter is automatically determined and can not be changed.
That is, in the case of a flat diaphragm using a conventional porous foam, if the reversibility of
the diaphragm is determined, the driving diameter is determined, and is the driving force applied
to the diaphragm? The size of the voice coil bobbin to be transmitted, the voice coil for obtaining
the driving force, and the magnetic circuit are determined. Therefore, even if you try to do
economic design, it will not work because of the constraints that come from size. It is possible to
change the diameter of the nodal circle by partially changing the surface density and the elastic
modulus of the diaphragm. If this is realized, the freedom to determine the voice coil bobbin and
the d-difference circuit is increased, and the economic design can be easily realized.
Conventionally, in order to realize such a diaphragm, as shown in the diaphragm cross-sectional
view of g2, the thickness of the porous foam as the core material is changed to change the
surface density of the diaphragm. I was the father of the diameter of the circle. In the figure, 1 is
a core material of the porous foam, and 2 is a method of putting on a surface material, since the
surface of the core material is not flat, it is difficult to attach the surface material. That's why we
don't put a surface material on this surface. However, this reduces the practical frequency band
because the bending rigidity is significantly reduced. The present invention has been made to
eliminate the disadvantages of the prior art as described above, so the object of the present
invention is to provide a diaphragm surface 'I! An object of the present invention is to provide an
imaging board for an acoustic Ps device in which attachment of a surface material is facilitated
by making a surface of a core material flat while giving a change to 7 degrees. The main point of
the configuration of the present invention is to change the position of the node generated on the
diaphragm by continuously changing the apparent density or Young's 4 (hereinafter collectively
referred to as density) of the flat plate made of porous foam, thereby achieving light weight and
high height. When backing up a rigid 'acoustic diaphragm, the apparent density of the porous
foam can not be arbitrarily controlled at the time of its production, so a plurality of porous foams
of different apparent densities are joined to form a flat plate. And to obtain a desired density
distribution.
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2, the scope of claims
The invention will now be described in detail with reference to the figures. FIG. 5 is a crosssectional view showing an embodiment of the present invention. In the figure, the porous foam of
the core material of the disk-shaped diaphragm which is a sand-inch structure consists of two
porous foams with different densities. The porous foam 1α has a conical shape, and the porous
foam 1b has a conical hole shape. The porous foams 1α and 16 are combined, for example, with
a layering agent to form a disk having a 11 r surface as shown. Therefore, the surface materials
2α and 2b can be provided by the same procedure as in the prior art. Now, if the density of the
porous foam 1α is made higher than the density of 1b, the density of the central part of the disc
becomes higher than the density of the outer peripheral part. The position of the nodal circle that
occurs in this case is shifted to the center of the disc than in the case of uniform density.
Therefore, if this diaphragm is used directly as a diaphragm for a large diameter bass speaker,
EndPage: 2 also has a smaller driving diameter than when a conventional disk type diaphragm is
used, so both the voice coil bobbin and the magnetic circuit are small. Can be used for economic
design. When the density of the porous foam 1b is higher than the density of 1α, the density of
the outer peripheral portion of the disc becomes higher than the density of the central portion.
The position of the node circle generated in this case is shifted to the outer periphery 11 of the
disk than in the case of uniform density. Therefore, when this diaphragm is used as a diaphragm
for high-pitched sound with a small diameter, a large voice coil can be adopted because the drive
size becomes larger than when a conventional disk-like moving plate is used, and heat resistance
Be advantageous to In addition, since the diameter of the pole piece of the magnetic circuit can
also be increased, the magnetic saturation, which has been a problem in the prior art, is
eliminated, and the entire magnetic circuit can be miniaturized and economic design can be
achieved. If "1B degree of porous foam 1a, 1b" is appropriately selected. The position of the joint
circle can be jlh to a considerable extent. 4 to 6 are cross-sectional views showing other
embodiments of the present invention, respectively. The embodiment shown in FIG. 4
corresponds to that in which the porous foam 1α in FIG. 3 is conical. The embodiment shown in
FIG. 5 is an embodiment in which the porous foam 1α has a disk shape and the porous foam 1b
has a donut shape surrounding it. In the embodiment shown in FIG. 6, the core material is
divided into three layers, and the disk-shaped porous foams 1α, 1b and id are combined with the
doughnut-shaped porous foams 1c and Ig. It is. The concept shown in the above embodiments
can be applied to not only a circular diaphragm but also flat plate type moving plates of other
shapes.
Further, in the example of FIG. 3, when it is assumed that the density K of the porous foam 1a is
larger than the density J of 1b, the surface material is stuck only on one side of the core material
without the surface material 2a and having uniform density. A song can hold its stiffness higher
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than it does. As is apparent from the above description, the effect of the present invention lies in
that the position of the nodal circle can be arbitrarily controlled without losing the strength of
bending due to the sand-inch structure, and hence the diaphragm of the present invention
According to this, the degree of freedom in design of the voice coil bobbin, the magnetic circuit,
etc. is increased, and the advantage of 0 which enables economical design is obtained. Further,
since the outer surface of the core material is a flat surface, the attachment of a surface material
such as a thin metal foil is easily suspended by a conventional method.
4. Brief description of the drawings M1 Figure is an explanatory view of valley vibration mode of
the disc-shaped diaphragm, Figure 2 is a cross-sectional view of a conventional diaphragm, and
Figure 3 is an embodiment of the present invention The IIT plan view shown in FIGS. 4 to 6 is a
cross-sectional view showing another embodiment of the present invention. Decoding code 1:
Core material of porous foam 2: Surface material agent Patent attorney patent attorney Toshiyuki
Koide 1 figure EndPage: 3
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