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JPH04128495

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DESCRIPTION JPH04128495
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
edge of a speaker diaphragm, and more particularly to the edge of a speaker diaphragm suitable
for low and mid range speakers.
[0002]
2. Description of the Related Art Conventionally, as shown in FIG. 1, a speaker unit is mounted so
that a speaker diaphragm 2 is held by an edge 1 to a frame 3 at the center of the speaker unit.
The diaphragm was configured to vibrate freely.
[0003]
The edge 1 of the speaker diaphragm 2 is a foam-like member of soft polyurethane, or a rubbercoated cloth for applying a rubber material to a cotton cloth or cloth-like polyester, an elastomer
material of a polymeric substance having rubbery elasticity at room temperature. It was formed
in the shape of a roll using the members of the above.
[0004]
The edge 1 thus formed is light-weight and easy to vibrate while holding the speaker diaphragm
2 in the center, and moreover, it is a condition that there is no generation of abnormal sound and
the like, and it is excellent in formability and environmental resistance. It was
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1
[0005]
However, as for the edge of the speaker diaphragm formed of the above-mentioned conventional
soft polyurethane foam-like member, the specific gravity of the soft polyurethane foam-like
member is reduced to 0.15 as much as possible. Although possible, there is a disadvantage that
the environmental resistance is poor.
[0006]
Further, although a rubber pulling cloth for applying a rubber material to a cotton cloth or clothlike polyester is relatively heavy with a specific gravity of 0.7 to 1.2 and excellent in
environmental resistance, the binder squeak of a curing material for molding an edge is
Therefore, there is a defect that abnormal noise is generated, and furthermore, a member of an
elastomeric material of a polymer material having rubbery elasticity has a defect such as a heavy
specific gravity of 1.2 to 1.4.
[0007]
The present invention has been made in view of the above-described point, and the object of the
present invention is to solve the drawbacks of the conventional example and to construct a
lightweight lightweight artificial leather material made of non-woven fabric of polymer fine
fibers. Also, the present invention is to provide an edge of a speaker diaphragm which is
excellent in environmental resistance and good in bass and medium sound reproduction
characteristics.
[0008]
SUMMARY OF THE INVENTION The edge of the speaker diaphragm according to the present
invention holds the speaker diaphragm at the center of the speaker unit, and the edge of the
speaker diaphragm configured to freely vibrate the speaker diaphragm. In the above, the edge of
the speaker diaphragm is made of a suede-like artificial leather material made of non-woven
fabric of polymer fine fibers.
[0009]
Alternatively, a resin material may be applied at the time of forming the edge of the speaker
diaphragm, and it may be formed by heating and waterproofing.
[0010]
According to this invention, the edge attached to the frame to hold the speaker diaphragm at the
center of the speaker unit is a suede-like artificial leather material made of non-woven fabric of
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2
polymer fine fiber, or nylon or polyester The artificial leather material of
[0011]
As described above, by making the speaker diaphragm edge of the suede-like artificial leather
material, it is possible to reduce the weight (specific gravity = 0, 27), and since it is a non-woven
fabric of polymer fine fibers, resonance etc. It is possible to realize an edge excellent in
environmental resistance without abnormal noise due to
[0012]
In particular, the lowest resonance frequency fo is high, and the resonance sharpness Qo and the
mechanical resonance sharpness Qm can be increased, and the impedance characteristic is
improved to make the edge vibration action easy to move and enhance the efficiency of the
acoustic output. Can.
[0013]
Further, the waterproof property of the edge surface can be improved by applying a silicone
resin material and forming it at the time of forming the edge of the speaker diaphragm.
[0014]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the edge of the
speaker diaphragm according to the present invention will be described based on FIGS. 1 to 3.
FIG.
FIG. 1 is a cross-sectional view of the speaker unit, FIG. 2 is a perspective view of the edge of the
speaker diaphragm, and FIG. 3 is a characteristic view showing speaker characteristics.
[0015]
In the figure, 1 is an edge of the speaker diaphragm, 1a is a roll or round portion of the edge 1, 2
is a speaker diaphragm held at the center of the speaker unit, 3 is a frame with the edge 1
attached, 4 is a frame The dampers 10 and 11 are characteristic curves showing the sound
pressure level characteristic of the speaker output, and 12 and 13 are characteristic curves
showing the impedance characteristic of the speaker.
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[0016]
The edge 1 for holding the speaker diaphragm 2 at the center of the speaker unit is attached to
the frame 3 by heat molding with a mold to form a roll or round shaped portion 1a as shown in
FIG.
[0017]
The edge 1 is, for example, a non-woven material made of nylon, polyester, rayon or the like
having a polymer fine fiber of about 5 microns, and is made of, for example, a Toray-Exsane
suede artificial leather material. The heat molding can be carried out at the same temperature of
about 120 ° C. as the temperature conditions of polyester film molding.
[0018]
The edge 1 of the suede-like artificial leather material thus formed by heating and molding has a
specific gravity of 0.27, which is next to a urethane foam and is lightweight, and moreover is an
aggregate of polymer fine fibers, so it is resistant to the environment. It also has excellent
characteristics.
In addition, there is a characteristic that it is difficult to resonate because the vibration is
converted into heat by the shift effect between the fibers of the edge 1.
[0019]
Further, by applying a silicone resin to one of the molds for forming the edge 1 and heating and
molding it, the surface of the edge 1 can be waterproofed, and the waterproof effect can be
enhanced.
[0020]
The electrical characteristics of the thus formed edge 1 of, for example, a 16 cm diameter low
frequency speaker unit are formed of a conventional, for example, a member of a high molecular
weight elastomeric material having rubbery elasticity at normal temperature Compared to the
same 16 cm aperture speaker unit shown in FIG.
[0021]
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In FIG. 3, the sound pressure level characteristic 10 is a characteristic curve of the speaker unit
of the present invention, and since the edge 1 is reduced in weight relative to the sound pressure
level characteristic 11 of the conventional speaker unit, the sound output sound pressure It is
possible to raise the level.
[0022]
Further, as can be seen by comparing the impedance characteristic 12 of the present invention
with the conventional impedance characteristic 13, the lowest resonance frequency fo = 47 Hz
(conventional lowest resonance frequency fo = 44 Hz) is increased, and the lowest resonance
frequency is obtained. It is possible to increase the impedance and the resonance sharpness of
the fo, Qo = 0.39 (conventional resonance acuity Qo = 0.34) and mechanical resonance acuity Qm
= 7.9 (conventional machine resonance acuity Qm = 3.4). The vibration operation can be made
easy to move and the efficiency can be enhanced, and the abnormal sound due to the resonance
can be eliminated to improve the sound quality.
[0023]
Although the edge 1 formed of the nonwoven fabric suede-like artificial leather material of the
polymer fine fiber has been described above, the same effect can be obtained by forming the
edge 1 of a leather material of nylon or polyester.
[0024]
As described above, the edge of the speaker diaphragm according to the present invention can be
reduced in weight, and the mechanical resonance sharpness Qm of the speaker can be increased,
so that the efficiency of the sound output can be increased. And the abnormal sound due to
resonance can be eliminated to improve the sound quality.
[0025]
In addition, it is less hygroscopic than natural leather materials (heavy specific gravity = 0.75)
and has excellent environmental resistance, and because it is an artificial leather material, it has
the effect of selecting a material of any color tone and expanding its application. Since this
artificial leather material is self-adhesive, no binder such as a curing agent is required, and the
production cost can be reduced.
[0026]
Moreover, it has excellent features such as simple structure and low cost because it can be easily
implemented.
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[0027]
Brief description of the drawings
[0028]
1 is a cross-sectional view showing the speaker unit of the present invention.
[0029]
2 is a perspective view of the speaker diaphragm edge of FIG.
[0030]
3 is a characteristic diagram showing the speaker characteristics of the speaker unit of the
present invention.
[0031]
Explanation of sign
[0032]
DESCRIPTION OF SYMBOLS 1 Roll shape or round shape part 2 provided at edge 1a edge of
speaker diaphragm 2 Speaker diaphragm of speaker unit 3 Frame 4 Damper 10 Sound pressure
level characteristic of speaker unit of this invention 11 Sound pressure level characteristic 12 of
conventional speaker unit Impedance characteristic of the speaker unit according to the present
invention 13. Impedance characteristic of the conventional speaker unit
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