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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing a conventional
speaker, FIG. 2 is a graph showing sound pressure-frequency characteristics and distortion
characteristics of the conventional speaker, and FIG. 3 is an embodiment of the speaker of the
present invention. 4 is a half sectional front view of the diaphragm used in the speaker, FIG. 5 is
a half sectional view of the diaphragm in another embodiment, and FIG. 6 is a diaphragm in still
another embodiment 7 is a front view of the same half section, and FIG. 8 is a sound pressurefrequency characteristic and a distortion characteristic view of the speaker of the present
invention. 13 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · voice coil, magnetic gap 25 ······ Diaphragm base body, 26 ······ Foamed resin layer.
DETAILED DESCRIPTION OF THE INVENTION In order to prevent split resonance in the middle
to high range, the second tree system attempts to sweep out a speaker having stable flat
rollability. In general, as a method of eliminating the disturbance of the sound soil-dark wave
number characteristics due to division # ink of middle and high tone range, the elastic plate
having a high elastic modulus determined by internal loss and Young's modulus- There is a
method of using a material having a high flexural modulus by increasing the weight of the
moving plate, and by increasing the thickness of the plate. As described above, there is one
problem in selecting the mobile board material. That is, even as a material with a high elastic
modulus, since the internal loss and the Young's modulus are in contradiction to each other, it is
impossible to improve the elastic modulus within the electrode. In addition, if the weight is
reduced, the efficiency of the speaker will be lowered, the sound pressure level will be lowered,
the high frequency limit will be faster, the sound pressure-frequency characteristics will have
peaks and dips, and harmonic distortion will not occur, either. Met. A typical conventional
speaker is configured as shown in FIG. That is, the frame 6 is coupled to the field portion 5
comprising the center ball 1, the nine plates 32, the ring-shaped magnet 3 and the ring-shaped
upper plate 4 and the peripheral portion of the frame 6 The peripheral portion of the plate 8 is
fixed, the voice coil 9 is compounded at the central portion of the moving plate 8, and the
intermediate portion of the voice coil 9 is supported by the damper 10 to make the voice coil 9
magnetic. In order to fit the gap 11 correctly, the dust cap 12 is adhered to the upper surface of
the central portion of the diaphragm 8 so as to fit properly. Also, as the moving plate 8 of the
present invention, a turtle made of paper or paper made of woven pulp such as pulp, a sheet
using a meeting elliptical sheet, a sheet using a foamed resin, or a metal foil is used. There is
something like that. Then, in order to block split co-imaging in the middle volume sound area, a
corrugated bran is formed in the middle part, and a straddling body is attached and run to
change the entire thickness of the imaging moving plate or the like. Configured. As described
above, in the case of forming Corruge 7 II, the high band is cut, and the characteristic is not λ11,
and in the case of attaching a reinforcing body, it takes time and effort to manufacture and the
sound becomes louder. There is a defect that the pressure level decreases, and for the ones that
change the thickness K, the molding technology becomes advanced, and there is a defect that it is
difficult to keep a certain quality and it leads to instability in quality. The speaker using the
peristaltic squeegee tossed the corrugation / l-n in the figure 142t142 Figure 6 which shows the
sound-six-inter-wave loss and distortion characteristics of the speaker O The present invention
eliminates the above-mentioned conventional defects. is there.
Hereinafter, the present invention will be described according to the third to eighth factors of the
present invention. First, in FIG. 3, the field portion 131 is a field portion 131, and the field
portion 13 is constituted of a brake 1 fi having a center ball 14, a ring-shaped magnet 16, and a
ring-shaped upper plate 17 There is. What is illustrated here is a field section called an external
magnet type, but is an internal magnet type field section in which a columnar magnet or a
columnar magnet and a pole piece are incorporated in a wedge shaped yoke. It is also good. A
frame 18 is connected to this field, A13, and a peripheral edge portion of the diaphragm 200
together with a gasket 19 is fixed to the peripheral edge portion of the frame 18. A voice coil 21
is coupled to the central portion of the recruitment plate 20, supported by an intermediate sVi
damper 22 of the voice coil 21, and the voice coil j is correctly disposed in the magnetic gap 23
of the field ii1'1 1113. . Further, a dust cap 24 is attached to the upper surface of the central
portion of the peristaltic plate 2Q. In this configuration, there is no excuse for eating at all with a
general speaker, but in the present invention, a feature is that as the pregnancy board 20, it is
configured as shown in @ 4 FIG. 1 and nine are used. is there. In other words, the transmission
plate 20 with the papermaking, synthetic position! On the surface of a base 26 formed in a
general shape by a fat film or metal foil, a foam city fat pigeon 26 that is light, such as acrylic or
polyurethane, has a large internal loss, and changes its thickness freely. The thickness increases
gradually as it approaches 'ffl' ll K from the center. The diaphragm 20 is made by spraying a
constant volume Q foam stkm solution on the surface of the base 260 and applying it by means
of an I water bath, which is set in a molding die and 114 parts from the center It is a turtle that is
foamed so as to be thick to form the foamed resin layer 26, and the bending elasticity as the
diaphragm 2o is increased to prevent split resonance. The foamed HR fat layer 26 can be formed
not only on one side but also on the ring face, or the center part can be abraded and the
peripheral part can be thin. However, it is possible to obtain two effects that the central part is
thicker and the peripheral part is thicker and the structure is excellent in the elongation of one
height and that the bending elasticity can be increased to prevent part loss and damage. Become.
In another embodiment, as shown in FIG. 6, a foam resin stock solution is applied to the surface
of the diaphragm base 26 so that the central portion OSt is thick and the concentration of the
peripheral portion is thin. The layer is foamed so as to have a thickness to form the map layer 26,
and the peripheral edge v @ a is dense dLt!
-You may use transfer board 2o which made small and delta completion bending strength was
increased. Of course, it can also be provided on both sides of the diaphragm substrate 25, and
the bending stiffness can be increased by reducing the density at the central portion, but the
higher the region by extending the periphery, the higher the frequency. It can be used as a wide
band speaker. In addition, making the foam # and the oil layer 28 identical to each other can
make the molding die simple, which is advantageous in terms of equipment. Furthermore, as
shown in FIGS. 6 and 7, an endless throat layer 26 is formed on the surface of the diaphragm
substrate 26 with a continuously changing radius from the center such as a flower shape, The
ebb and flow of foam El & q 21! By measuring the bending strength 14 of the diaphragm 20 and
the bending strength of the vibrating plate 20, the imaging plate 20 may be 711 in which no
parting pregnancy occurs. This is because the foamed resin [26] is not applied to the entire
surface, it can be made lighter than those of the two embodiments described above, and the
efficiency of the speaker can be improved. A sound pressure-generic wave number characteristic
and a distortion characteristic in the case of 9 are shown in FIG. 8 using this imaging plate 2o. As
the speaker according to the present invention, such as 8 or more -F, uses as a diaphragm a lightweight, large internal loss 1111 resin layer splayed on a sliding plate base, so It is possible to
prevent split resonance in the middle and high range, and flatten the Ono-Hoto wave number
characteristic as shown in FIG. Because it can be reduced and it is lightweight, it can also prevent
the decrease in performance t. Also, during the season, it is sufficient to simply take a foam resin
chamber liquid (plate base IC is applied and foam it, and a, mm → the adhesive itself has
adhesive properties, so no plaster agent is required, Productivity is rich in, and it is a dog of
practical II value, which has the advantage of dancing by eating a large amount of a fixed amount
of one bowl at a high food.
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