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JPH03270497

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DESCRIPTION JPH03270497
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm in which a diaphragm main body and a bobbin are integrated, and relates to
one in which the loss of driving force generated by a voice coil is reduced. [Prior Art] A general
speaker comprises a voice coil and a magnet for generating a driving force, a dome or cone type
diaphragm body for converting the driving force into a sound wave, the voice coil and the
vibration. It comprises a damper for keeping the plate body in a fixed position, a support member
such as an edge or a pad plate for supporting the periphery of the diaphragm body, and a frame
for connecting and holding these parts. FIG. 2 shows an example of the structure of the
diaphragm portion in a conventional speaker in general. In the structure of this example, a ridge
portion 2 is formed on the outer peripheral portion of the dome-shaped diaphragm main body l.
The cylindrical bobbin 3 is adhered to the back surface side of the above, and the voice coil 4 is
adhered to the outer peripheral surface of the bobbin 3. The speaker having the abovementioned structure can generate a driving force in the voice coil 4 by energizing the voice coil 4
placed in the magnetic field which the magnet acts, and the diaphragm l is vibrated by the
driving force to generate an acoustic wave. Can be generated. In the speaker having the abovedescribed conventional structure, the driving force that the diaphragm 1, the bobbin 3 and the
voice coil 4 are joined via the adhesive layer 5 and acted on the voice coil 4 Is transmitted to the
diaphragm 1 via the bobbin 3 and each adhesive layer 5. However, since the adhesive layer 5 has
a lower Young's modulus than the material constituting the diaphragm 1 and the bobbin 3, there
is a problem that drive loss easily occurs in the diaphragm 1, and the specific gravity of the
adhesive layer 5 is further Because of the large size, there is a problem that the weight of the
diaphragm 1 and the bobbin 3 increases and the response becomes worse. The present invention
has been made to solve the above-mentioned problems, and the diaphragm main body, the
bobbin and the voice coil are integrated without using an adhesive, and the diaphragm is
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generated with a small loss of driving force generated by the voice coil. An object of the present
invention is to provide a speaker diaphragm which can be transmitted to a main body. [Means for
Solving the Problems] In order to solve the above-mentioned problems, the present invention is
formed by continuously and integrally forming a diaphragm main body and a bobbin with an
insulating material, and embedding and fixing a voice coil inside a peripheral wall of the bobbin.
is there. Since the "action" diaphragm main body and the bobbin are continuously made of the
same material and the state coil is embedded in the bobbin and fixed, the driving force acting on
the voice coil is transmitted to the diaphragm with low loss. .
Further, since the adhesive that causes the weight increase is not necessary, the vibration system
is reduced in weight, the efficiency is improved, and the response is improved. Hereinafter, the
present invention will be described in more detail. FIG. 1 shows an embodiment of the present
invention. In FIG. 1, a portion indicated by reference numeral 10 is a dome-shaped diaphragm
main body, and a cylindrical bobbin 11 is provided on the peripheral portion of the diaphragm
main body IO. Continuous-the state is north. Then, the voice coil 12 is embedded in a fixed state
in the peripheral wall of the bobbin 11, and the outer peripheral wall of the bobbin 11 in the
portion in which the voice coil 12 is embedded protrudes outward to form a thick portion 13 ing.
The material constituting the diaphragm main body 10 and the bobbin II can be used as long as
it is excellent in electrical insulation, but diamond, SiC, Al t Os, T i C, T I can be suitably used. N
ST t B t, A I B t, polymer liquid crystal, and the like. Moreover, the constituent material of the
voice coil 12 should just be a material with favorable electroconductivity. Hereinafter, an
example of a method of manufacturing the diaphragm having the above structure will be
described. In order to manufacture the diaphragm having the above-described structure, a
substrate having an outer surface shape that matches the inner surfaces of the target diaphragm
body IO and the bobbin 11 is prepared. As this substrate, in the case of manufacturing the
diaphragm shown in FIG. 1, a cylindrical U-shaped cross section having one end closed is used.
Once this substrate is prepared, the substrate is set in a known film forming apparatus such as a
microwave heating type plasma CVD apparatus, an ion beam vapor deposition apparatus or a
sputtering apparatus, and a diaphragm material such as diamond along the outer peripheral
surface of the substrate Film is formed. Next, a coil is formed in a portion corresponding to the
bobbin of the film formed on the substrate. For the formation of the coil, it is possible to apply a
method of forming a conductor layer made of copper or the like and forming a pattern of the
conductor film to form a coil. The etching can be performed by applying a photoresist on the
outer surface of the conductor film, exposing the substrate while rotating it, developing it, and
forming an etching mask after etching, but other methods may be used. Of course, you may use.
Next, a covering layer made of A1103 or the like is formed by sputtering or the like so as to
cover the outer surface of the portion corresponding to the bobbin, and thereafter the substrate
is set again in the microwave heating type plasma CVD apparatus and vibrated under the same
conditions as the previous time. A diaphragm made of a plate material can be further grown to
obtain a diaphragm. As the covering layer formed here, it is necessary to use a layer which has
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good insulation and does not disturb the formation of the diamond film.
In this example, AlzOs was selected as a material suitable for the growth of a diamond film and
having a good insulation property, since copper used as a conductor film is unbearable to the
growth of a diamond film. It is safe to form a layer. By further forming a film after forming the
coil on the bobbin portion in this manner, the coil is fixed in a state of being completely
embedded in the bobbin portion. By employing the manufacturing method as described above, it
is possible to obtain the vibrating film having the structure described above. Further, FIG. 3
shows an example of an injection molding die suitable for use in the case of producing the
diaphragm and the bobbin with a polymer liquid crystal (polyester type thermotropic liquid
crystal). In FIG. 3, 20 is an upper mold and 21 is a lower mold. A convex nozzle 22 is formed on
the lower die 21, a groove 23 is formed on the outer periphery of the bottom of the nozzle 22,
and an injection hole 24 is formed on the upper end of the nozzle 22. When the upper mold 20
and the lower mold 21 are integrated as shown in FIG. 3, a molding cavity S is formed between
them, and the molding cavity S is made high. It can emit molecular liquid crystal. In the figure,
reference numeral 25 denotes a voice coil lead wire. For injection molding using the mold having
the configuration shown in FIG. 3, the voice coil is held at a predetermined position in the bobbin
by holding the lead wire 25 of the voice coil between the upper mold 20 and the lower mold 21.
Fix it in place. Then, by injecting the polymer liquid crystal into the molding space S from the
injection hole 24 of the nozzle 22 at about 310 ° C., the speaker diaphragm can be formed. The
melting point of the polymer liquid crystal is about 300 ° C., and when injection molding is
performed, the molecules are oriented, and the molecules themselves serve as a reinforcing
material. [In order to manufacture a diaphragm having the shape shown in FIG. 1, it is shaped so
as to follow the inner peripheral surface of the diaphragm of FIG. A substrate was prepared. This
substrate was made of Si. The substrate was set in a microwave plasma CVD apparatus, and a
diamond film was grown on the substrate for 70 hours under the conditions of a substrate
temperature of SOO ° C. and a CH 4 concentration of 0.5 vol%. After that, the substrate is taken
out of the CVD apparatus, placed in a vacuum evaporation apparatus, a conductor layer of 100
μm thick made of Cu is formed on the outer peripheral part of a portion corresponding to a
bobbin, and pattern etching is performed on this conductor layer. 71 turns of a 100 μm Cu layer
coil were used. This pattern etching was performed by applying a photoresist on the surface of
the conductor layer, rotating the bobbin for exposure, and making an original image, forming an
etching mask and then etching.
After that, a coating layer of A15Oi was formed on a portion corresponding to the bobbin by a
high frequency sputtering apparatus, and then it was put into the microwave plasma apparatus
again, and a diamond film was grown for 100 hours under the same conditions as the previous
one. Thereafter, the substrate is dissolved and removed with a mixed solution of nitric acid and
hydrofluoric acid, and a voice coil is embedded inside the bobbin, and a diamond diaphragm in
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which the diaphragm body, the bobbin and the voice coil are integrated is obtained. It was done.
As a result of measuring the relationship between the frequency characteristics and the sound
pressure of the diaphragm manufactured as described above and the conventional diaphragm
configured using an adhesive as shown in FIG. 2, the results shown in FIG. was gotten. From the
results shown in FIG. 4, the sound pressure change in the high frequency range is reduced in the
diaphragm of the present invention than in the conventional diaphragm configured using an
adhesive, and the loss of the driving force of the diaphragm is It turned out to be small. [Effects
of the Invention] As described above, according to the present invention, since the diaphragm
main body and the bobbin are continuously integrally formed of the same material and the voice
coil is embedded and fixed in the peripheral wall of the bobbin, the drive acting on the voice coil
The force can be directly transmitted to the diaphragm body with low loss. Further, since an
adhesive which causes an increase in weight is not required, the vibration system can be reduced
in weight, the efficiency can be improved, and the response can be favorably made.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross sectional view showing one embodiment of the present invention, FIG. 2 is a
cross sectional view showing one structural example of a conventional diaphragm, FIG. 3 is a
cross sectional view showing one example of a mold, and FIG. It is a graph which shows the
frequency characteristic of an Example, and the frequency characteristic of a prior art example.
10: Diaphragm body, 11: Bobbin, 12: Voice coil, 13: Thickness inside.
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