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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a is a top view of an essential part of a
conventional speaker, FIG. 1 is a sectional view thereof, and FIG. 1C is a sectional view of an
essential part of another conventional speaker, FIG. Is a sound pressure frequency characteristic
diagram of the conventional speaker, FIG. 3 is a cross-sectional view of a main part of the
speaker of the prior application, FIG. 4a and 4b are sound pressure frequency characteristics
diagram of the speaker of FIG. 6A and 6B are sound pressure frequency characteristics of the
present embodiment. 1 ииииии Flat plate diaphragm, 3 ? ииииииииииииииииииииииииииииииии Voice coil, 5 ииииии Drive
cone, 9 ииииииии Adhesiveness material. Fig. 1 <a; 717 "-! m--1 Figure 2 fzo-fzo '15 tIQIKFKS (OK
20KM =, ? t (k)-
DETAILED DESCRIPTION OF THE INVENTION The present invention aims to flatten the sound
pressure frequency characteristics of a speaker (hereinafter referred to as a flat plate speaker)
using, for example, a flat diaphragm. In recent years, high-fidelity reproduction (for example, due
to flattening of sound pressure frequency characteristics) has been required even in speakers due
to progress in digital audio technology such as digital audio disc and PCM tape decoding. Flatpanel speakers have (1) no distortion of sound pressure characteristics (front chamber effect)
based on the shape of cones, as compared with conventional cone speakers. (2) The piston
vibration region is wide, and a wide band and low distortion can be achieved. It is expected that it
will be the mainstream of future speakers with the features said. However, in order to realize a
wider band in a flat panel speaker, it is essential to drive the node of the divided vibration of the
diaphragm (node drive), which causes the voice coil and the magnetic circuit to be large, which in
turn causes the high cost. The FIG. 1 shows the main part of a conventional speaker. In FIG. 1 (-)
and (b), 1 is a circular flat diaphragm. A nodal circle 2 is generated on the circular flat diaphragm
1 by low-order divided vibration. A coil bobbin h / 3 is fixed to the part of this nodal circle, and a
coil 4 ^ e: q3: 1 is coil 4 is wound around the lower end of this coil dip / 3. As described above,
when the coil bobbin 3 having the same diameter as that of the nodal circle 2 is used, the
magnetic circuit is enlarged. Therefore, using the drive cone 5 formed of a truncated cone as
shown in FIG. It is proposed to miniaturize six. However, as shown in FIG. 2, the drive cone drive
type speaker has a problem that sharp peaks appear on the characteristics. The first peak (near
11 KHz) is due to the second resonance of the diaphragm (f2 o)-the second peak (near 18 KHz) is
due to the resonance of the drive cone root (f; o). It is a major issue to remove these peaks and to
develop a flat loudspeaker having flat frequency characteristics. As a method conventionally used
for damping the sound pressure peak, as disclosed in Japanese Patent Publication No. 55-43680,
a method of using a viscous substance and an elastic substance in the contact portion between
the diaphragm and the voice coil has been proposed. . However, the above-mentioned method is
an elastic material and a viscous material, which are formed of independent materials, and
basically different from the method of the present invention as described in detail below,
although it is 06a4. Also, when the elastic modulus of the elastic material for coupling the
diaphragm and the voice coil is too high, no matter how much the viscous substance intervenes,
its effect can hardly be expected, and conversely, the elastic modulus of the elastic material is
low. If it is too large, there is a disadvantage that the bonding strength is weak and the problem
of reliability arises.
Also, the peak reduction by the conventional visco-elastic material has the disadvantage that the
band is simultaneously reduced and the efficiency is reduced due to weight increase, and a
diaphragm resonance peak as sharp as 10 dB or more as in a flat panel speaker is There was no
technology to reduce without causing a decrease. The inventors of the present invention have
already proposed a speaker in which the peak is reduced without lowering the band by
interposing a viscous substance in the driving force transmission path between the driving unit
and the radiation surface. Specification and drawings). A configuration diagram of this speaker is
shown in FIG. 1 is a circular flat diaphragm, 6 is an edge member for supporting the flat
diaphragm 1, and 5 is a drive cone. Also, 3 'is a coil bobbin, and 4) is evening / these are fixed
with a conventional adhesive 0616, :::. The drive cone 6 and the voice coil 3 'are bonded not
using an adhesive but using an adhesive substance 8, and the damping effect of the adhesive
substance layer is intended to suppress sharp resonance peaks. The sound pressure
characteristic of 1 W large input is shown in FIG. 4 (a). It is a broad band and non-flat
characteristic. However, as a result of studies by the present inventors, it has been found that the
properties of the adhesive substance 8 change with temperature, so that the characteristics may
deteriorate when a large input is applied. As the relationship between the input and the sound
pressure characteristic is shown in FIG. 4 (b), even in the case of the speaker with the above
configuration, there is a drawback that the band is narrowed due to the viscosity decrease of the
adhesive substance at the large input. The present invention provides a speaker in which the
decrease in apparent viscosity due to temperature change is suppressed by adding a filler to the
adhesive substance, and the input resistance is improved. Hereinafter, an embodiment of the
present invention will be shown and described. This embodiment is structurally similar to the
speaker shown in FIG. 3 as shown in FIG. 6, and is shown in FIG. 3): filled with a cross-linked
acrylic "adhesive instead of the heifer adhesive 80 As an agent, a sticky substance 9 obtained by
adding 6 wt% of t15 long aramid fiber 0626 was used. The sound pressure characteristic at 1 W
of this speaker is shown in FIG. 6 (a). Further, the relationship between sound pressure
characteristics and input is shown in FIG. 6 (b). From these figures, it can be seen that the
addition of the filler hardly causes the characteristics, particularly the deterioration of the zone,
even when a large input is applied. This is a result that the cohesion of the adhesive is improved
by the fiber entanglement of the filler, and the change of the cohesion at the time of temperature
rise is also reduced. The filler is not limited to the above-mentioned aramid fibers, and may be
other fibrous ones, and the same effect can be observed with flaky ones such as mica powder.
On the other hand, similar effects can be obtained with rubber-based adhesives that are widely
used for general use, but the above-mentioned cross-linked acrylic or silicone-based adhesives
are superior in performance from the viewpoint of aging and heat resistance. It can be
demonstrated. Although the embodiment has been described above, the present invention is not
limited to the range of the embodiment described above, and in the case of another joint direct
drive system without drive 3> cone, 1 n 9- '27 ?, also Pois The coil bobbins can be made into
2M and can be immediately implemented in reconnaissance such as joining them with the abovementioned cocoon material. The same effect can be obtained by using the diaphragm of the cone
speaker other than the flat plate speaker and the contact layer portion of the voice coil. As is
apparent from the above embodiments, the present invention is based on the use of a pressuresensitive adhesive containing a filler as a visco-elastic body for transmitting the driving force of
the voice coil to the diaphragm. (1) It is possible to suppress the decrease in cohesive force at
high temperature, improve the input resistance, and prevent the decrease in the band. (The
conventional lamination process can be used as it is to carry out the Oshimoto device, and since
it is only necessary to pour the paste containing the filler directly into the shield part, there is no
increase in man-hours and cost 'increase, weight increase) Because there is no risk of efficiency
decline. And so on.
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