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JP2001204094

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2001204094
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dome-shaped speaker used in various audio devices.
[0002]
2. Description of the Related Art A conventional loudspeaker will be described with reference to a
cross-sectional view of a dome-shaped loudspeaker shown in FIG.
[0003]
In the figure, 1 is a yoke, 2 is a magnet, 3 is a top plate, and the yoke 1 and the top plate 3
sandwich the magnet 2 to form an annular magnetic gap 4.
A voice coil 5 is wound around a voice coil bobbin 6 and is suspended so as to be able to vibrate
in the magnetic gap 4.
[0004]
Reference numeral 7 is a dome diaphragm as a speaker diaphragm formed of a thin metal foil,
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and the roll-shaped edge 8 is formed of a cloth coated with a rubber-based resin on its surface to
eliminate air permeability. . The outer peripheral portion of the edge 8 is fixed on the spacer 9
and sandwiched by the baffle plate 10.
[0005]
The operation of the dome-shaped speaker configured as described above will be described
below.
[0006]
First, the voice coil 5 is suspended in the magnetic gap 4. When an electric signal is applied to
the voice coil 5, the dome diaphragm 7 is vibrated via the voice coil bobbin 6 according to
Fleming's left-hand rule. Let it sound.
[0007]
The dome-shaped dome diaphragm 7 of the speaker configured as described above is a sheet
obtained by impregnating a film such as a polyimide film or a polyethylene naphthalate resin film
alone or a cloth substrate in addition to the above metal foil, or a cloth substrate. A molding is
used, and as the metal foil, one obtained by molding titanium, aluminum or the like is used.
[0008]
However, the speaker diaphragm obtained by molding a resin film such as the above-mentioned
polyimide film or polyethylene naphthalate resin film is light in weight and has good rigidity, but
internal loss As a result, resonance is apt to occur because of lack of
On the other hand, a speaker diaphragm consisting of a soft dome obtained by forming a sheet
obtained by impregnating a rubber resin into a cloth base material has a very high internal loss
and enables high sound quality with little resonance, but the material is heavy, Sound pressure is
low.
In addition, since there are many manufacturing processes such as impregnating a cloth base
material with a thermosetting phenol resin and a rubber-based resin as a molding resin, there are
problems such as variations in quality.
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[0009]
In addition, a diaphragm for a loudspeaker such as a dome shape obtained by molding a metal
such as titanium or aluminum has high rigidity and good expansion (high-frequency
characteristics) up to the high-frequency band, but a small internal loss. Resonance is likely to
occur and there is a keen peak feeling.
Since the metal foil has a low elongation rate, a certain material thickness is required at the time
of molding, and when it is thin, generation of wrinkles and cracks occur. Since the specific gravity
is high, it has the disadvantage that the sound pressure is low.
[0010]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional
problems, and provides a speaker using a dome-shaped loudspeaker diaphragm for treble sound,
which is lightweight, has a very high internal loss, and is excellent in heat resistance and
reliability. It is the purpose.
[0011]
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker of the present
invention uses a resin film as a base material, and a foam resin sheet, or an elastomer or nonwoven fabric laminated on this surface is molded into a desired shape. The speaker diaphragm is
used to construct a speaker.
[0012]
The speaker diaphragm can realize a speaker with high sound quality, which has a very high
internal loss and little resonance.
Further, when molded into a dome shape, the above-described laminated foamed resin and the
like have a large internal loss and flexibility, so when molding the speaker diaphragm, dome
molding can be easily performed, and the quality is stable. It is possible to provide a speaker that
is
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[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim
1 of the present invention is a speaker obtained by heating and pressing a resin film as a base
material and laminating a foamed resin sheet, an elastomer or a non-woven fabric on this surface.
It is possible to provide a speaker with high sound pressure, low variation, good quality, and
excellent reliability, using a diaphragm for vibration.
[0014]
According to the invention of claim 2 of the present invention, a polyurethane resin film, a
polyurethane foam resin film, or a non-woven fabric made of silk is used as a laminated material
on the substrate of the speaker diaphragm according to claim 1. The speaker using the speaker
diaphragm can provide a speaker with high sound pressure, little variation, good quality, and
excellent reliability.
[0015]
The invention according to claim 3 of the present invention uses the non-stretched film as the
resin film for the base material of the speaker diaphragm according to claim 1, thereby achieving
light weight, high rigidity, length and width of the non-stretched film. It is possible to provide a
more excellent speaker diaphragm with less deformation after molding, taking advantage of the
small difference in physical strength in the direction, and the speaker using this also has high
sound pressure and little variation, It can be of good quality and reliable.
[0016]
Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.
FIG.
[0017]
(First Embodiment) FIG. 1 is a cross-sectional view of a speaker diaphragm which is a main part
of a speaker according to the present invention, and FIG.
[0018]
First, a base 1, a base 2, a base 3, a base for comparison A, a base for comparison B, and a base
for comparison C were prepared as samples.
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[0019]
The shape of the speaker diaphragm was a shape shown in FIG. 1, and was a dome shape having
a diameter of 25 mm.
The height is 10 mm.
[0020]
Substrate 1 A laminate sheet material obtained by adhering and mounting a polyurethane foam
resin sheet on a polyethylene naphthalate resin film 30 μ was used as the substrate 1.
The foaming ratio of the foamed resin sheet was 30 times that of foaming.
A urethane type was used as the adhesive.
The weight of the substrate 1 is about 65 to 70 g / m 2.
[0021]
Substrate 2 A laminate sheet material obtained by laminating a flexible 20 μ urethane resin film
with a 30 μ polyethylene naphthalate resin film was used as the substrate 2.
The urethane resin film can be bonded to the polyethylene naphthalate resin film at the time of
film processing, and does not require an adhesive.
The weight of the substrate 2 is about 60 to 65 g / m 2.
[0022]
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Substrate 3 A laminate sheet material in which a nonwoven fabric made of silk and the like was
attached to a polyethylene naphthalate resin film 30μ by adhesion was used as the substrate 3.
The basis weight of the non-woven fabric is 30 g / m 2. A urethane type was used as the
adhesive. The weight of the substrate 3 is about 65 to 70 g / m 2.
[0023]
Comparative base material A A base material A of polyethylene naphthalate resin film 50μ was
obtained as an example of a conventional dome-shaped loudspeaker diaphragm. The weight of
the substrate A is about 60 to 65 g / m 2.
[0024]
Comparative base material B As another example of the conventional dome-shaped speaker
diaphragm, a base material B of aluminum foil 30 μm (30 μm or less can not be molded for
molding into a dome shape) was obtained. The weight of the substrate B is about 80 to 85 g / m
2.
[0025]
Comparative Base Material C As another example of the conventional dome-shaped speaker
diaphragm, a sheet base material C obtained by impregnating a cloth with a rubber resin was
obtained. The weight of the substrate C is about 95 to 100 g / m 2.
[0026]
The base material for the diaphragm will be described in more detail with reference to FIG. 1.
When the speaker diaphragm 11 made of the base material 1 is formed into a dome shape, the
urethane foam sheet 13 is attached to the polyethylene naphthalate film 12 It is formed. Since
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the foamed urethane sheet 13 itself has good elongation and flexibility, the speaker diaphragm
11 has good formability due to the cushioning effect of the foamed urethane sheet 13 with
respect to the mold at the time of molding. Become.
[0027]
The polyethylene naphthalate film 12 uses a non-oriented film. Although a stretching film is
effective, using a non-stretching film can provide a better speaker diaphragm 11 with less
deformation after molding.
[0028]
The speaker diaphragm 11 described above is composed of the polyethylene naphthalate film 12
having appropriate rigidity and the urethane foam sheet 13 having high internal loss, so that a
speaker with high sound quality with little resonance can be realized.
[0029]
In addition, as a film forming condition, the sheet of the above-mentioned constitution is heated
to a temperature of 150 ° C. to 160 ° C. for 5 seconds to 10 seconds, inserted into a mold and
pressure-molded, and then cooled to 100 ° C. or less. The target speaker diaphragm 11 can be
obtained by taking out from the mold.
Since the same effect can be obtained even if the material of the resin film is changed, the
description is omitted.
[0030]
Comparison of physical characteristics, elongation rate, density and formability of the abovementioned base materials 1 to 3 and comparative base materials A to C to (Table 1) the
characteristics of the speaker using the above-mentioned speaker diaphragm (FIG. 2) Show.
[0031]
Fig.2 (a) is a frequency sound pressure characteristic of the speaker using the speaker diaphragm
by the base material 1, FIG.2 (b) is based on the base material A for comparison, and FIG.2 (c) is
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for comparison. The substrate C is used.
[0032]
As apparent from FIG. 2, the speaker using the speaker diaphragm of the base material 1 has a
high sound pressure, and not only can reproduce the range up to the high region, but also has
low distortion with few peaks in the high region It was confirmed that it became a speaker.
[0033]
Further, as apparent from (Table 1), since the speaker diaphragm according to the present
embodiment has good weight, rigidity and elongation rate, excellent effects can be obtained in
terms of formability. Was confirmed.
[0034]
As described above, since a resin film is used as a base material as a diaphragm for a speaker
used in the speaker of the present invention, and a foam resin sheet, an elastomer, a non-woven
fabric and the like are laminated thereon, they are formed. It is possible to provide a high-sound
dome-shaped speaker which is light in weight, high in sound pressure, easy in manufacturing
process, and excellent in quality with less variation while achieving a speaker of high sound
quality with a small amount of sound.
[0035]
Brief description of the drawings
[0036]
1 is a cross-sectional view of a speaker diaphragm which is an essential part of the speaker of the
present invention.
[0037]
Fig. 2 (a) Sound pressure frequency characteristics of the speaker according to the present
embodiment
[0038]
Fig. 3 Cross section of a conventional dome-shaped speaker
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[0039]
Explanation of sign
[0040]
11 Speaker diaphragm 12 polyethylene naphthalate film 13 urethane foam sheet
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