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The present invention relates to the improvement of the planar spill force using a disc diaphragm
of t-type f-structure, and in particular, the t! It relates to the bonding of facing materials, core
materials and driven parts. One of the features of a flat loudspeaker using a disc diaphragm is
that it can drive the node circle of the resonance mode of the disc diaphragm (referred to as node
drive or mode drive) so that the reproduction band can be expanded to higher order resonance
by K. It's out. 1 and 2 are cross-sectional views showing an example of a flat loudspeaker using a
conventional disk diaphragm. In each figure, 1 is a disk diaphragm, 2 is a voice coil, 2 'is a voice
coil bobbin, 3 is an edge, 4 is a centering spider, 5I /' i drive cone, 6 is a magnetic circuit, 7 is a
frame to support these. is there. FIG. 1 shows a method of directly bonding and driving the voice
coil 2 to the nodal circle (Mate) portion of the disk diaphragm 10 primary resonance mode ([W!
FIG. 2 shows a method (drive cone method) of driving via the drive cone 5 between the disk
diaphragm 1 and the voice coil A / 2. The conventional disk diaphragm and the like speaker have
the following disadvantages. FIG. 3 is a characteristic diagram showing sound pressure frequency
characteristics of the cocha. Looking at the characteristic-# a, fh is a lost beak due to the second
resonance (fh = 2200 Hz) K of the disk diaphragm 1. Although the calculated value of the first
resonance frequency is about 500 Hz, it disappears due to the node drive. Furthermore, peak /
deep generation occurs at about 1000 H + a, which is approximately halfway between the o
primary resonance and the secondary resonance. The following describes these causes 411-. In
general, the resonant frequency (high frequency resonant frequency) of a node-round driven disc
m1lJ plate (high frequency resonant frequency) f: where K: number of legs IL: radius of
diaphragm D: bending stiffness of the diaphragm one: rTJ 'of the diaphragm ? The tI difference
disk diaphragm 1 generally has a tinditch structure as shown in FIG. 4 in order to increase the
bending rigidity and to reduce the surface density. 8 and 8 'are surface materials (skin or face), 9
is a core material (core), and 10 and 10' are adhesive agents. The facing material 8.8 'is generally
a 7 t Fi thin plate such as aluminum plastic, or fiber reinforced plastic (FRP). As the core material
9, aluminum, plastic, glue, paper or the like may be formed into a honeycomb shape to be used,
or foamed plastic, glue, light alloy or the like may be used. It is well known that the surface
material 8.8 'and the core material 9 are generally joined together with a strong adhesive 10.10'
to form a plate.
Since the above-mentioned material is generally used as a material of high elasticity and high
rigidity, the internal loss is small, which causes a low peak as shown in FIG. 3aK at the resonance
frequency fl1. Furthermore, since the voice coil Pobi y 21 -the drive cone 5 is joined to the part
corresponding to the nodal circle (hereinafter also referred to as a drive circle) of the first free
mode of the peripheral free disk diaphragm, the schematic diagram of FIG. As shown in the
figure, a part of the disk vibration '# L1 or a new parasitic resonance fr or @ generated in the
case of supporting (when the friend is fixed) by a circle 墳 11 (which strikes the voice coil bobbin
2 ′ or the drive cone 5) . This resonance peaks and falls on the characteristic curve at about
1000 Hz as shown in FIG. The resonance mode shown by the dotted line in FIG. 5 closely
resembles the first resonance mode of the peripheral free disk diaphragm 1III. When this
resonance occurs, as indicated by the arrows, the drive circle portion is stretched and sheared.
Further, in a conventional speaker using a disk diaphragm, the method of 1 year 6 and off
diagram is used in order to suppress the height of the peak at the high frequency resonance
frequency fh. FIG. 6 shows that a damping agent 12.12 'is provided at the junction of the disc
diaphragm 10 and the core material 9 of the kunditch structure, and further an adhesive 10.10'.
It joins at 10 'and 10 ". In this structure, as shown by the arrow in FIG. 5, the deviation is likely to
occur in the drive circle. Since the damping agent 12.12 'is used as a sheet of rubber or the like,
the mass of the disc diaphragm 1 is increased, and the sound pressure level may not be reduced.
In the off view, an elastic body 16 is interposed between the disc tiIJIll plate 1 and the drive cone
5 to constitute a mechanical filter of-檀. However, in this configuration, the elastic body 13
performs the drawing j 11 action, but the internal loss is small because the thickness or thickness
of the elastic body 13 is small, and the peak height Fi does not become so low. SUMMARY OF
THE INVENTION It is an object of the present invention to provide a speaker having a wide band
and good flatness without lowering the height of the peak at the resonance frequency fh without
the drawbacks of the prior art described above. In order to achieve the above object, in the
speaker of the present invention, the nodal points of the disc diaphragm (the surface material 8.8
'and the core material 9) are generated by the voice coil via the mechanical filter having the hole
power F. K) Uniformly transmit, and make the inside of the cylinder less susceptible to
deformation or slippage due to shear stress. FIG. 8 is a perspective view showing the features of
the disk iia plate of the embodiment of the present invention.
FIG. 10 shows an embodiment in which the diaphragm of the present invention shown in FIG. 8
is incorporated into a drive cone type speaker. すなわち、ナンドイ、? -A plurality of through
holes 15 are provided on the nodal circle 14 of the first resonance mode of the disc m1lJ plate of
structure, and a rubber or plastic elastic body 17 is wrapped in a pipe or bin 16 as shown by
91dK. A plurality of mechanical filters 18 are inserted, and the elastic body 17 is bonded to the *
m material 8, 8 and the core material 9. Similarly, the pipe or bin 16 and the voice coil pin 2t are
bonded to the drive cone 5. By doing this, it is possible to simultaneously transmit the driving
force y to the whole of the joint circle 14 of the diaphragm simultaneously, and further, since
both the surface members 8.8 'and the core member 9 are joined, shear stress is generated. On
the other hand, the motorized inner portion (node circle) 14 of the disk diaphragm 1 is less likely
to be displaced. According to the method described above, the elastic body 17 of the mechanical
filter 18 produces an internal loss due to a shift as shown by the arrow in FIG. To decrease. As
shown in the sound pressure frequency characteristic of FIG. 3, the length of the peak at the
resonance frequency fh point is significantly reduced. Further, the rubber hardness and the
shape of the elastic body 17 may be changed according to the common frequency fh. The effect
may be slightly reduced or the mechanical filter 18 may be made of only an elastic body.
Furthermore, new parasitic resonance f due to node drive. This problem does not occur because
the drive of the disk diaphragm 1 (node circle) 14s is less likely to occur due to the joining of the
mechanical filter 18 with the surface material 8.81 and the core material 9. As a result, the sound
pressure frequency characteristic becomes flat and wide.
Brief description of the drawings
1 and 2 are sectional views of a speaker using a disk diaphragm, FIG. 3 is a sound pressure
frequency characteristic diagram of a speaker using a disk diaphragm according to the present
invention and the prior art, and FIG. FIG. 5 is a schematic view of a parasitic resonance generated
by node driving in the conventional method, and FIG. 6 is a perspective view of a conventional
method for damping resonance of a disk diaphragm of an f structure, FIG. The figure is a crosssectional view of a conventional speaker using a mechanical filter of the conventional type, FIG. 8
is a perspective view showing the configuration of a disc diaphragm of the present invention, and
FIG. 9 is a mechanical filter incorporated in the disc diaphragm of FIG. FIG. 10 is a cross-sectional
view showing a structure in which the disk diaphragm of the present invention is incorporated
into a drive cone type speaker.
DESCRIPTION OF SYMBOLS 1 ... Disc vibration board, 2 ... Voice coil, 2 '... Voice coil bobbin, 3 ...
Edge, 4 ... Centering spider, 5 ... Drive cone, 6 ... Magnetic circuit , 7 ... frame, 8.8 '... surface
material, 9 ... core material, 10, 10', 10 ', 10 "... adhesive, 11 ... fulcrum, 12 ... Braking agent, 15 ...
elastic body, 14 ... joint circle, 15 ... through hole, 16 ... bin, 17 ... elastic body, ... ... mechanical
filter. 5 years old 4 fertilization + 5 figure old 6 figure o ■ figure 8 8 14 o '7 figure to II21
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