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JPH0629298

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DESCRIPTION JPH0629298
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm support structure of a speaker.
[0002]
2. Description of the Related Art FIG. 8 shows a support structure of a diaphragm in a
conventional cone type speaker. That is, in FIG. 8, 1 is a yoke, 2 is a magnet, and 3 is a frame.
4
A cone-shaped diaphragm is supported on the inner peripheral side on the central portion side of
the frame 3 via the coil bobbin 5 and the damper 6 and on the outer peripheral side on the outer
peripheral side of the frame 3 via the edge 7. 7a is a center cap, 8 is a voice coil, and 9 is a
terminal.
[0003] As shown in FIG. 8, the edge 7 is formed separately from the diaphragm 4 and the
diaphragm 4, and then bonded by an adhesive to be integrated with the diaphragm 4. things and
[0004] In the case of a medium-sized or large-sized speaker, as in the latter case, the edge 7 is
formed separately from the diaphragm 4 and integrally formed by bonding with an adhesive. ing.
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1
In the case of this bonding structure, the bonding operation of bonding the edge 7 to the
diaphragm 4 is very troublesome, and there is a problem of lack of workability, excess and
deficiency of adhesive, positional deviation between the edge 7 and the diaphragm 4 and the like
occur. There is a problem that it is easy to achieve and there is variation among products, making
it difficult to achieve high quality uniformity.
[0005]
Also, particularly in the case where the diaphragm 4 is a molded article of a phenolic resin
material, reliable bonding is difficult unless the adhesive is applied by roughening the surface of
the bonding site, and partial bonding is achieved. When a defect occurs, the part peels off or an
abnormal vibration occurs, and there is a defect that the acoustic characteristic as a speaker is
impaired.
[0006]
In view of the conventional problems, the present invention can be integrated with the
diaphragm at the time of forming the edge despite the fact that the diaphragm and the edge are
separate structures, and the work efficiency, the quality improvement and the quality
improvement The purpose is to make it possible to achieve uniformity.
[0007]
SUMMARY OF THE INVENTION In the present invention, an edge 18 is provided on the outer
periphery of the diaphragm 13, and the outer periphery of the diaphragm 13 is attached to the
frame 12 through the edge 18. In the diaphragm support structure of a car, an edge 18 is
molded on the outer periphery of the diaphragm 13.
The edge 18 may be molded so as to sandwich the outer peripheral portion of the diaphragm 13
from both the front and back sides, and may be molded on one side of the outer peripheral
portion of the diaphragm 13.
[0008]
[Operation] Since the edge 18 is molded on the outer periphery of the diaphragm 13, the
diaphragm 13 and the edge 18 can be integrated when molding the edge 18, and the bonding
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2
step of bonding both with an adhesive When the edge 18 is molded so as to hold the outer
peripheral portion of the diaphragm 13 from both the front and back sides, the edge 18 does not
easily come off the diaphragm 13.
Furthermore, when the edge 18 is molded on one side of the outer peripheral portion of the
diaphragm 13, the molding of the edge 18 is facilitated.
[0009]
Embodiments of the present invention will now be described in detail with reference to the
drawings. 1 to 4 show a first embodiment of the present invention. In FIGS. 1 and 2, 10 is a yoke,
11 is a magnet, and 12 is a frame. 13The diaphragm is a diaphragm formed in a cone shape by a
resin material such as a phenol resin, and the inner periphery thereof is supported by the frame
12 via a coil bobbin 14 and a damper 15. 16はボイスコイル、17はセンタ−キャップである。
[0010]
Edges 18 are molded on the outer periphery of the diaphragm 13 at equal intervals in the
circumferential direction. Each edge 18 is attached to the frame 12 by a receiving portion 19 on
the outer periphery of the frame 12 and a pressing ring 20.
[0011]
The edge 18 is made of plastic such as phenol resin, and as shown in (A) and (B) of FIG. 3, a
clamping portion for clamping the flange portion 21 of the outer peripheral portion of the
diaphragm 4 from both front and back sides. 22 and a mounting portion 23 interposed between
the receiving portion 19 of the frame 12 and the pressing ring 20, and an arc-shaped curved
portion 24 connecting the holding portion 22 and the mounting portion 23 integrally. It is
configured to be substantially Ω-shaped in side view and rectangular in plan view. The edge 18
is adapted to absorb the vibration at the curved portion 24.
[0012]
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The edge 18 is molded on the flange portion 21 of the diaphragm 13 by the method as shown in
FIG. That is, as shown in FIG. 4, the flange portion 21 of the outer peripheral portion of the
diaphragm 13 is sandwiched from above and below by a pair of upper and lower dies 25 and 26,
and provided at equal intervals in the circumferential direction between the dies 25 and 26. The
resin material 29 is injected into the cavity 27 from the injection hole 28, and the edge 18 is
molded so as to sandwich the flange portion 21 of the diaphragm 13 from both the front and
back sides.
[0013]
As described above, by adopting a method of molding so as to sandwich the flange portion 21 of
the diaphragm 13 at the time of molding the edge 18, the bonding process for bonding the edge
18 to the diaphragm 13 can be omitted. Can. Moreover, although the edge 18 is divided into a
plurality of circumferential directions, each edge 18 can be simultaneously integrated with the
diaphragm 13, and the workability is remarkably improved.
[0014]
Furthermore, since each edge 18 is molded on the diaphragm 13, it is sufficient to accurately
position the diaphragm 13 between the molds 25 and 26 so that the quality can be improved and
uniformed. Can be implemented. Therefore, the occurrence of peeling due to adhesion failure and
abnormal vibration can be prevented, and the acoustic characteristics are not impaired.
[0015]
FIG. 5 shows a second embodiment of the present invention, in which the edge 18 is elongated in
the circumferential direction, and a long hole 30 is formed in the curved portion 24 thereof. In
this way, the number of edges 18 can be reduced. Further, although the bent portion 24 is
elongated in the circumferential direction, since the long hole 30 is provided, it is possible to
prevent a decrease in vibration absorbability of the bent portion 24. Of course, if the material of
the edge 18 is appropriately selected, the long hole 30 is not necessarily required.
[0016]
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4
FIG. 6 shows a third embodiment of the present invention, in which the edge 18 is molded in a
ring shape over the entire periphery of the diaphragm 13, and the curved portions 24 are equally
spaced in the circumferential direction. A large number of holes 31 are provided.
[0017]
By molding the edge 18 into a ring shape in this manner, the amount of material used increases,
but since the outer periphery of the edge 18 is concentric with the diaphragm 13, the frame 12
can be used. There is no risk that the edge 18 will be caught and damaged by other members
during the mounting operation, and handling at the time of operation will be easy.
If the material of the edge 18 is properly selected, the hole 31 may be omitted as in the case of
the second embodiment of FIG.
[0018]
FIG. 7 shows a fourth embodiment of the present invention, in which a tongue-like joint 32 is
provided at the inner end of the curved part 24, and this joint 32 is brought into contact with the
back of the flange 21 of the diaphragm 13. The edge 18 is formed by molding in the same
condition. Also in this case, when the material of the diaphragm 13 and the edge 18 is made the
same material, the bonding portion 32 may be joined and integrated to the flange portion 21 of
the diaphragm 13 when the edge 18 is formed.
[0019]
Although the junction 32 of the edge 18 is joined to the surface side of the flange portion 21 of
the diaphragm 13, and in each of the embodiments, the cone type diaphragm 13 is exemplified.
The same can be applied to a diaphragm of a mold.
[0020]
According to the present invention, since the edge 18 is molded on the outer periphery of the
diaphragm 13, the diaphragm 13 and the edge 18 have a separate structure although they are
separately formed. The edge 18 and the diaphragm 13 can be integrated at the time of forming
the edge 18, and efficiency of work, improvement of quality and uniformity can be achieved.
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[0021]
When the edge 18 is molded so as to hold the outer peripheral portion of the diaphragm 13 from
both the front and back sides, the edge 18 can be made difficult to be detached from the
diaphragm 13.
Furthermore, forming the edge 18 on one side surface of the outer peripheral portion of the
diaphragm 13 has an advantage that molding of the edge 18 is facilitated.
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