JPH07284190

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DESCRIPTION JPH07284190
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment.
[0002]
2. Description of the Related Art A conventional speaker will be described with reference to the
drawings.
[0003]
FIG. 8 is a front half sectional view showing the structure of a conventional speaker. In FIG. 8, 17
is a lower plate having a center pole portion, 18 is a ring-shaped magnet, 19 is a ring-shaped
upper plate, and these are laminated To form a magnetic circuit in which a magnetic gap is
formed.
[0004]
20 is a frame coupled to the upper surface of the magnetic circuit, 21 is a diaphragm whose
outer peripheral portion is coupled to the periphery of the frame 20, 22 is coupled to the center
of the diaphragm 21 and eccentric to the magnetic gap No. 23 is a gasket connected to the
periphery of the frame 20 together with the outer peripheral part of the diaphragm 21. 24 is a
damper for supporting the voice coil 22. 25 is coupled to the upper surface of the central part of
the diaphragm 21. Dust cap.
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[0005]
Also, in place of the dust cap 25, there has been a configuration in which conical sub cones are
combined for the purpose of reproducing high range.
[0006]
Furthermore, when using a resin material as the bobbin material on which the coil of the
subcone, the dust cap 25 or the voice coil 22 is wound, a polyethylene naphthalate composed of
naphthalene dicarboxylic acid and ethylene glycol for the purpose of achieving high reliability
and low distortion. A film (hereinafter referred to as a PEN film) was molded into a desired shape
and used.
[0007]
However, since the sub cone and dust cap 25 or bobbin made of the above-mentioned
conventional PEN film are polymer films, they can be easily formed into a dome shape or a
cylindrical shape and have good productivity, and are inexpensive It is characterized in that it can
be supplied in large quantities, but its stiffness is smaller and its rigidity is lower compared to
metal diaphragms of aluminum, titanium, etc. and the same metal bobbin, so low-frequency
reproduction is easy but sound reproduction band is narrow. When the thickness is reduced,
distortion occurs and there is a disadvantage that the input resistant surface of the speaker is
easy to flicker.
In addition, since the rigidity is lacking even in the high frequency reproduction, the high sound
quality can not be reproduced.
[0008]
It is an object of the present invention to solve such conventional problems and to provide a
speaker of excellent performance capable of reproducing high-quality sound even in a speaker
using a sub-cone, a dust cap, or a bobbin made of resin material. It is
[0009]
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker according to
the present invention has a voice coil which couples a frame to the upper surface of a magnetic
circuit having a magnetic gap formed therein and which fits around the frame in the magnetic
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gap. Desired is a highly stretched PEN film in which the outer peripheral portion of the
diaphragm coupled to the center is bonded, and a network-like or turtle-shaped alumina film
having a film thickness of 5 Å to 1000 Å is formed on at least one side on the upper surface of
the voice coil. It is set as the structure which couple ¦ bonded the sub cone shape ¦ molded to the
shape.
[0010]
According to this configuration, since the highly stretched PEN film is used as the sub-cone base,
the rigidity is increased and the sound velocity as the material is improved.
[0011]
In addition, by coating the film surface with an alumina film in a mesh shape or a shell shape, the
sputter-coated alumina film is not a uniform film, but a mesh shape having a crack or a gap from
a mesh shape is formed on the film surface. Since a hard alumina film can be formed without
impairing the formability to a dome shape, the rigidity is further increased while the internal loss
is increased, and it is possible to perform higher-quality sound reproduction.
[0012]
Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with
reference to the drawings.
[0013]
FIG. 1 is a front half sectional view showing the configuration of the speaker according to the
embodiment, in which 6 is a lower plate having a center pole portion, 4 is a ring-shaped magnet,
and 5 is a ring-shaped upper plate These are stacked and coupled to form a magnetic circuit in
which a magnetic gap is formed.
[0014]
3 is a frame coupled to the upper surface of the magnetic circuit, 8 is a voice coil fitted to the
magnetic gap without eccentricity, 2 is coupled to the voice coil 8 at the center and the outer
peripheral portion is on the periphery of the frame 3 A combined diaphragm 9, a gasket coupled
to the periphery of the frame 3 together with the outer peripheral portion of the diaphragm 2, a
damper 7 for supporting the voice coil 8, and a sub-cone 1 coupled to the upper surface of the
voice coil 8 is there.
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[0015]
FIG. 2 is a cross-sectional view showing the above subcorn 1 and is formed by reactive sputtering
on one side of a PEN film 11 obtained by highly stretching a polyethylene naphthalate film
(hereinafter referred to as PEN film) comprising naphthalenedicarboxylic acid and ethylene
glycol. The substrate on which the alumina film 12 of about 50 Å in thickness is formed is
molded into a subcone 1 having a desired shape shown in the same figure at a molding
temperature of 210 ° C. and a molding time of 15 seconds.
[0016]
Further, the physical property values of the base material having the alumina film 12 formed on
one side of the PEN film 11 are shown in Table 1 in comparison with the physical property
values of the conventional PEN film.
[0017]
As apparent from this (Table 1), the substrate made of the PEN film 11 having the alumina film
12 according to the present invention has significantly improved both the speed of sound and
the internal loss compared to the conventional PEN film. I understand that
[0018]
Furthermore, the above-mentioned alumina film 12 in which aluminum is surface-coated by
reactive sputtering in an oxygen atmosphere has a network-like structure as shown in FIG. 3 in
which the surface state is enlarged. It is relieved by the mesh-like or turtle-shaped gaps of the
hard alumina film 12 and does not greatly affect the formability.
Further, it is considered that the hard alumina film 12 has a large number of gaps, and this effect
causes a large internal loss.
[0019]
Therefore, the subcone 1 used in the speaker of the present invention has a high internal loss
due to the rigidity of the PEN film as the base material and the alumina film 12 having a mesh or
turtle-like coating layer formed on the surface. The speaker of the present invention using this
sub-cone 1 can improve the high frequency reproduction limit frequency, and can also realize
delicate and clear sound quality.
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[0020]
(Embodiment 2) The second embodiment of the present invention will be described below with
reference to the drawings.
[0021]
FIG. 4 is a front half sectional view showing the configuration of the speaker according to the
embodiment, in which 6 is a lower plate having a center pole portion, 4 is a ring-shaped magnet,
and 5 is a ring-shaped upper plate These are stacked and coupled to form a magnetic circuit in
which a magnetic gap is formed.
[0022]
3 is a frame coupled to the upper surface of the magnetic circuit, 8 is a voice coil fitted to the
magnetic gap without eccentricity, 2 is coupled to the voice coil 8 at the center and the outer
peripheral portion is on the periphery of the frame 3 A combined diaphragm 9, a gasket coupled
to the periphery of the frame 3 together with the outer peripheral portion of the diaphragm 2, a
damper 7 for supporting the voice coil 8, and a pair 10 coupled to the upper surface of the
central portion of the diaphragm 2 It is a dust cap.
[0023]
FIG. 5 is a cross-sectional view showing the dust cap 10, which is the same base material as in
Example 1 in which an alumina film 14 of about 50 Å in thickness is formed on one side of a
highly stretched PEN film 13 by reactive sputtering. The molding temperature is 210 ° C., the
molding time is 15 seconds, and the molded product is molded into the desired shape of the dust
cap 10 shown in the figure, and the physical property values of the above-mentioned base are
the same as the above (Table 1).
[0024]
Furthermore, the above-mentioned alumina film 14 in which the surface is coated with aluminum
by reactive sputtering in an oxygen atmosphere has a network state on the surface, and therefore
the elongation at the time of molding of the film is a network of hard alumina film 14 Or it is
relieved by a turtle-shaped gap, and does not have a big influence on moldability.
Also, it is believed that the hard alumina film 14 has a large number of gaps, and this effect
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causes a large internal loss.
[0025]
For this reason, the dust cap 10 used in the speaker according to the present invention has a
high internal loss due to the rigidity of the base PEN film 13 and the alumina film 14 on the
surface of which a mesh-like or turtle-like coating layer is formed. Thus, the speaker according to
the present invention using the dust cap 10 can improve the high frequency reproduction limit
frequency, and can realize a more delicate and clear sound quality.
[0026]
(Third Embodiment) The third embodiment of the present invention will be described below with
reference to the drawings.
[0027]
FIG. 6 is a front half sectional view showing the configuration of the loudspeaker according to the
embodiment, in which 6 is a lower plate having a center pole portion, 4 is a ring-shaped magnet,
and 5 is a ring-shaped upper plate, These are stacked and coupled to form a magnetic circuit in
which a magnetic gap is formed.
[0028]
3 is a frame coupled to the upper surface of the magnetic circuit, 8 is a voice coil fitted to the
magnetic gap without eccentricity, 2 is coupled to the voice coil 8 at the center and the outer
peripheral portion is on the periphery of the frame 3 A combined diaphragm 9, a gasket coupled
to the periphery of the frame 3 along with the outer peripheral portion of the diaphragm 2, a
damper 7 supporting the voice coil 8, and a dust cap 10 coupled to the upper surface of the
voice coil 8 It is.
[0029]
FIG. 7 is a cross-sectional view showing the bobbin 8a for forming the voice coil 8. The alumina
film 16 having a thickness of about 50 Å is formed on one side of the highly stretched PEN film
15 by reactive sputtering. The same base material is molded into a cylindrical shape and molded
into a bobbin 8a of a desired shape, and the physical property values of the above-mentioned
base material are the same as the above (Table 1).
[0030]
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Furthermore, the surface state of the above-mentioned alumina film 16 in which aluminum is
coated on the surface by reactive sputtering in an oxygen atmosphere has a network structure,
and hence the elongation at the time of molding of the film is a network shape of hard alumina
film 16 or It is relieved by the turtle-shaped gap and does not greatly affect the formability.
Also, it is believed that the hard alumina film 16 has a large number of gaps, and this effect
causes a large internal loss.
[0031]
For this reason, the bobbin 8a for voice coil used in the speaker of the present invention has a
high internal loss due to the rigidity of the PEN film 15 as the base material and the alumina film
16 having a reticulated or turtle-like coating layer formed on the surface. The speaker of the
present invention using this bobbin 8a has an improved high frequency reproduction limit
frequency, and can also realize delicate and clear sound quality.
[0032]
As described above, the loudspeaker according to the present invention is a highly stretched PEN
having a sub-corn, dust cap or bobbin formed with a network-like or shell-like alumina film
having a thickness of 5 Å to 1000 Å on at least one side. By forming the film into a desired shape
and using it, the rigidity is enhanced, the sound velocity is improved, and the internal loss is
increased, so that clear and delicate high-quality sound reproduction can be performed.
[0033]
Furthermore, by coating and forming an alumina film on the surface of the substrate, it is
possible to reduce the rate of change in physical properties due to special environments such as
heat resistance and weather resistance, and it is possible for outdoor as well as indoor use. It is
possible to use it for such applications, and it is a large-scale industrial value that can be massproduced inexpensively.
[0034]
Brief description of the drawings
[0035]
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1 is a front half sectional view showing the structure of a speaker according to a first
embodiment of the present invention
[0036]
2 is a front sectional view showing the structure of a sub cone used in the speaker according to
the same embodiment.
[0037]
Fig. 3 Enlarged surface view of the sub-cone base material according to the same embodiment
[0038]
4 is a front half sectional view showing the configuration of the speaker according to the second
embodiment of the present invention
[0039]
5 is a front sectional view showing the structure of the dust cap used for the speaker according
to the same embodiment.
[0040]
6 is a front half sectional view showing the configuration of the speaker according to the third
embodiment of the present invention
[0041]
7 is a front sectional view showing the configuration of a voice coil bobbin used for the speaker
according to the same embodiment.
[0042]
Fig. 8 A front half sectional view showing the configuration of the conventional speaker
[0043]
Explanation of sign
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[0044]
DESCRIPTION OF SYMBOLS 1 sub cone 2 diaphragm 3 frame 4 magnet 5 upper plate 6 lower
plate 7 damper 8 voice coil 8a bobbin 9 gasket 10 dust cap 11, 13, 15 PEN film 12, 14, 16,
alumina film
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