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JPH0477096

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DESCRIPTION JPH0477096
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dome-shaped diaphragm with high efficiency and improved sound pressure frequency
characteristics, a method of manufacturing the same, and a speaker using the same. 2. Related
Art In recent years, diaphragms using resin materials have been introduced into Hi-Fi speaker
systems from the viewpoint of simplicity of manufacturing method and equalization of
performance. With the development of fluid liquid crystal polymers, it has also been adopted as a
diaphragm of a dome-shaped speaker that has a high frequency range. Hereinafter, the
conventional dome-shaped diaphragm described above will be described with reference to the
drawings. FIG. 6 shows a cross section of a conventional dome-shaped diaphragm. In FIG. 6,
reference numeral 41 denotes a dome-shaped diaphragm, which is connected to a dome portion
42, a voice coil bobbin joint portion 43 provided on the outer peripheral portion of the dome
portion 42, and a lower end portion of the voice coil bobbin joint portion 43; It has a disc portion
44 which is a bonding surface. FIG. 7 is a cross-sectional view of a conventional dome-shaped
diaphragm during molding, and FIG. 5 is a cross-sectional view showing a conventional method
of molding a dome-shaped diaphragm. In FIG. 7, 41 is a dome-shaped diaphragm at the time of
molding, and is a disk connected to a dome portion 42, a voice coil bobbin joint portion 43
provided on the outer peripheral portion of the dome portion 42, and a lower end portion of the
voice coil bobbin joint portion 43. It consists of a part 44. 45 is a gate port provided on the back
of the '4' part 42, and 46 is a resin (runner) injected from a molding machine (not shown). In FIG.
8, reference numeral 47 denotes a fixed mold portion of the injection molding mold, and 48
denotes a movable mold portion, which are provided on the back of the dome portion 42, voice
coil bobbin joint portion 43, disc portion 44 and dome portion 42. A gate port 45 is formed, and
46 indicates a runner from which a resin is injected from a molding machine (not shown). A
method of manufacturing the dome-shaped diaphragm configured as described above will be
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described below. FIG. 8 shows the fixed mold portion 47 of the injection molding mold and the
movable mold portion 48 clamped, and the resin melted from the molding machine (not shown)
passes through the runner 46 and the gate port 45. , And flows in the circumferential direction to
form a dome-shaped diaphragm 41. The dome-shaped diaphragm 41 thus molded is shown in
FIG. 4 fal, and the dome-shaped diaphragm 41 is cut through the step of cutting the runner 46
with the gate 45 and the step of cutting to a predetermined outer diameter. It becomes. Problems
to be Solved by the Invention However, the above-described conventional configuration has the
following problems. +11 Because the gate port 45 of the dome-shaped diaphragm 41 is provided
on the back of the top of the dome-shaped diaphragm 41, the flow direction of the resin changes
rapidly at right angles, so the flow resistance is large, and the thickness is 150 to 200 μm Was
the limit and could not thin.
(2) Therefore, titanium (density −-5, 4 g / c ++ t, t = 20 to 25 μm) and aluminum (density, -2, 7
g / cn (t = 40 to 50 μm)) generally used for dome-shaped diaphragms When the weight is set to
be equal, the density of the high performance and high fluidity resin material or ρ−1.3 to 1.6 g
/ cat, so the thickness must be 70 to 100 μm, and the weight of the vibration system becomes
heavy and the speaker The efficiency was poor. (3) Since the gate 45 is provided on the back of
the top, the resin molecules are axially oriented and the stiffness is axially symmetrical, so a peak
is generated in the high frequency range in the sound pressure frequency characteristics of the
speaker The The present invention solves the above-mentioned conventional problems, aims to
reduce the weight of a dome-shaped diaphragm using a high-performance, high-fluidity resin
material, to improve the efficiency of the speaker, and to make the axis non-axially rigid. It is an
object of the present invention to provide a dome-shaped diaphragm in which sound pressure
frequency characteristics are improved, a method of manufacturing the same, and a speaker
using the same. Means for Solving the Problem In order to solve the problem, the dome-shaped
diaphragm of the present invention is injection-molded from a polymer resin material, and the
orientation of the molecules of the dome portion is substantially parallel, A polymer resin is
formed using an injection molding die comprising a dome portion, a voice coil bobbin joint
portion, a disc portion, and a gate port formed in a part of the disc portion, and a flow resistance
adjusting portion provided in the gate port. Injection molding of the material. With this
configuration, in the method of manufacturing the dome-shaped diaphragm, the shape of the
gate opening can be freely formed, and a wide film gate can be formed on the same plane as the
disc portion. Therefore, the thickness of the diaphragm can be uniformly reduced. However, the
flow resistance can be reduced, the weight of the dome-shaped diaphragm can be reduced, and
the orientation of the molecules of the polymer resin material can be approximately parallel.
Furthermore, as the dome-shaped speaker, the efficiency of the squirrel-pie force can be
improved to reduce the weight of the dome-shaped diaphragm, and injection molding is
performed using a polymer resin material, and the orientation of the molecules of the dome
portion is approximately parallel, It is possible to improve the sound pressure frequency
characteristics in the high sound range by making the axis non-axially rigid. Embodiment An
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embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a
perspective view of the dome-shaped diaphragm of the present invention. In FIG. 1, reference
numeral 1 denotes a dome-shaped diaphragm, which is connected to a dome portion 2, a voice
coil bobbin joint portion 3 provided on the outer peripheral portion of the dome portion 2, and a
lower end portion of the voice coil bobbin joint portion 3; It is comprised from the disk part 4
which is a joint surface.
FIG. 2 is a perspective view of the dome-shaped diaphragm of the present invention when
molded, FIG. 3 is a cross-sectional view showing the method of molding the dome-shaped
diaphragm of the present invention, and FIG. In FIG. 2, 1 is a dome-shaped diaphragm at the time
of molding, and a disk connected to the dome portion 2 and a voice coil bobbin joint portion 3
formed on the outer peripheral portion of the dome portion 2 and connected to the lower end
portion of the voice coil bobbin joint portion 3 It is formed of a part 4. Reference numeral 5
denotes a film gate provided on a part of the disc portion 4, and 6 denotes a resin (runner)
injected from a molding machine (not shown). In FIG. 3, 7 denotes a fixed mold portion of the
injection molding mold, 8 denotes a movable mold portion, and a dome portion 2, a voice coil
bobbin joint portion 3, a disc portion 4, and a part of the disc portion 4 The film gate 5 is formed,
and the film gate 5 is set thinner in the film gate 5 than in the center toward the both ends as
shown in FIG. 4 (for example, as shown in FIG. 4). ) Is provided. 6 shows a runner from which a
resin is injected from a molding machine (not shown). FIG. 3 shows the fixed mold part 7 of the
injection mold and the movable mold part 8 clamped, and the resin melted from the molding
machine (not shown) is wider through the runner 6. The light is emitted from the film gate 5 and
flows to the opposite side to form the dome-shaped diaphragm 1. At this time, since the path
passing through the top of the dome portion 2 is longer than the path passing through the other
portions, a resin seam (weld line) is generated in the dome portion 2 on the opposite side of the
film gate 5. This is inconvenient to the strength of the diaphragm, and as shown in FIG. 4, the
film gate 5 is provided with a flow resistance adjusting portion 9 which is set thinner at the ends
than at the center as it goes to both ends. The flow front is set to move substantially linearly.
Therefore, the orientations of the molecules become approximately parallel. The dome-shaped
diaphragm 1 thus molded is shown in FIG. 2 and becomes a dome-shaped diaphragm through the
process of cutting a predetermined outer diameter. The configuration and operation of the domeshaped speaker configured using the dome-shaped diaphragm 1 as described above will be
described below. FIG. 5 shows a cross-sectional view of a dome-shaped speaker using the domeshaped diaphragm 1 of the present invention. In FIG. 5, 10 is a bottom plate, 11 is a ring-shaped
magnet, 12 is a top plate, and the bottom plate 10 and the top plate 12 sandwich the magnet 11
to form an annular magnetic gap 13. A voice coil 14 is wound around a voice coil bobbin 15 and
is suspended so as to be able to vibrate in the magnetic gap 13.
Reference numeral 1 denotes a dome-shaped diaphragm injection-molded from a resin material,
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and an edge 16 is fixed to the outer peripheral portion. The outer peripheral portion of the edge
16 is fixed on the spacer 17 and sandwiched by the baffle plate 18. The reference numeral 19
denotes a screw for fixing the baffle plate 18. In the above configuration, the voice coil 14 is
suspended in the magnetic gap 13, and when an electric signal is applied, the voice coil 14
vibrates up and down according to Fleming's left hand law, and the dome-shaped diaphragm 1
via the voice coil bobbin 15 Vibrate. Here, as the dome-shaped speaker, it is possible to improve
the efficiency of the rispy force by reducing the weight of the dome-shaped diaphragm 1, and
injection molding is performed using a polymer resin material, and the orientation of the
molecules of the dome portion 2 is approximately parallel. Because of this, it is possible to
improve the sound pressure frequency characteristics in the high frequency range by making the
axis non-axially rigid. As described above, according to the present embodiment, the domeshaped diaphragm of the present invention, the method of manufacturing the same, and the
speaker using the same are injection-molded from a polymer resin material and the orientation of
the molecules of the dome portion 2 is approximately The dome-shaped diaphragm 1 is set in
parallel, and one method of manufacturing the dome-shaped diaphragm 1 is to gate the dome 2,
the voice coil bobbin joint 3, the disc 4 and a part of the disc 4. The speaker is formed by
injection molding using an injection molding mold formed of a flow resistance adjusting portion
9 which forms a mouth and is provided in the gate port, and is characterized by a speaker
provided with the dome shaped diaphragm 1. With this configuration, in the method of
manufacturing the dome-shaped diaphragm, the shape of the gate port can be freely formed, and
the wide film gate 5 can be formed on the same plane as the disk portion 4. The flow resistance
can be reduced even if the weight is reduced, and the weight reduction of the dome-shaped
diaphragm 1 and the orientation of the molecules of the polymer resin material can be made
approximately parallel. Furthermore, as the dome-shaped speaker, the efficiency of the speaker
can be improved by reducing the weight of the dome-shaped diaphragm 1, and injection molding
of a polymer resin material is performed, and the orientation of the molecules of the dome
portion 2 is approximately parallel. It is possible to improve the sound pressure frequency
characteristics in the high frequency range by making the axis non-axially rigid. Although the
film gate 5 is provided in the disk portion 4 in the embodiment, it is needless to say that the disk
portion 4 may be recessed to such an extent that the flow resistance does not increase in order to
prevent deformation after molding. Effects of the Invention As described above, the present
invention is a dome-shaped diaphragm which is injection-molded from a polymer resin material
and the orientation of the molecules of the dome portion is approximately parallel, and the
method of manufacturing the dome-shaped diaphragm is a dome It is formed by injection
molding using the injection molding die which consists of a flow resistance adjustment part
which forms a gate port in a part, the voice coil bobbin joint part, the disk part, and a part of the
disk part and is provided in the gate port. Since the speaker is formed using the above domeshaped diaphragm, in the method of manufacturing the dome-shaped diaphragm, the shape of
the gate port can be freely set, and a wide film gate is formed in the same plane as the disc
portion Therefore, even if the thickness of the diaphragm is reduced uniformly, the flow
resistance can be reduced, and the weight reduction of the dome-shaped diaphragm and the
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orientation of the molecules of the polymer resin material can be made approximately parallel.
Furthermore, as the dome-shaped speaker, the efficiency of the speaker can be improved by
reducing the weight of the dome-shaped diaphragm, and it is injection-molded from a polymer
resin material, and the orientation of the molecules of the dome portion is approximately parallel.
It is possible to improve the sound pressure frequency characteristics in the high sound range by
making the axis non-axially rigid. As described above, the present invention can realize an
excellent dome-shaped diaphragm, a method of manufacturing the same, and a speaker using the
same.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a dome-shaped diaphragm according to an embodiment of the
present invention, FIG. 2 is a perspective view of the dome-shaped speaker diaphragm of the
present invention at the time of molding, and FIG. 4 is a cross-sectional view of the gate portion,
FIG. 5 is a cross-sectional view of a dome-shaped speaker using the dome-shaped diaphragm of
the present invention, and FIG. 6 is a conventional dome-shaped vibration. FIG. 7 is a crosssectional view of a plate, FIG. 7 is a cross-sectional view of a conventional dome-shaped
diaphragm during molding, and FIG. 8 is a cross-sectional view showing a conventional domeshaped diaphragm molding method.
DESCRIPTION OF SYMBOLS 1 ···· Dome shape diaphragm, 2 ····· Dome portion, 3 ········ Voice coil
bobbin joint portion 4 ······ Disk portion, 5 ··· · Film gate, 6 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
························································································
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··········· Baffle plate, 19 ···· ··Screw. i disease
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