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JPS62265895

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DESCRIPTION JPS62265895
[0001]
TECHNICAL FIELD The present invention relates to a speaker diaphragm used for audio
equipment. Prior Art Conventionally, this type of speaker diaphragm has a structure as shown in
FIG. 4 and FIG. 5, for example. That is, an edge 2 formed by molding a flexible material into a
predetermined shape is adhered to the outer peripheral portion of the diaphragm main body 1.
In this example, an edge 2 is attached to the back side of the diaphragm main body 1 [a singledigit structure is shown, but the edge 2 may be attached to the front side of the diaphragm main
body 1. Moreover, although this example has taken the method of affixing the edge 2 shape ¦
molded previously to the diaphragm main body 1, shaping ¦ molding of the edge 2 and adhesion
¦ attachment to the diaphragm main body 1 may be performed simultaneously using a press die. .
Problems to be Solved by the Invention FIGS. 6 and 7 show sectional views of the case where the
diaphragm is incorporated into a speaker. FIG. 6 is a cross sectional view of the whole, and FIG. 7
shows an enlarged cross section of an edge portion. Here, when an audio signal flows in the voice
coil located in the magnetic circuit 6 formed of the magnet 3, the upper plate 4, and the plate 6
with the center pole, the voice coil 7 vibrates in the vertical direction accordingly. Thus, the
diaphragm main body 1 is vibrated to generate sound. At this time, as shown in FIG. 7, one end of
the edge 2 is adhesively fixed to the diaphragm main body 1 and the other end is adhesively
fixed to the frame 8. For this reason, when the diaphragm main body 1 vibrates up and down, a
force acts to separate the two from the edge 2 and when a large force is applied to the bonding
portion, for example, when the vibration or width is large, the pulp is mainly used. The material
causes delamination at the end face portion 1a of the diaphragm main body 1 made of the abovementioned paper. It becomes the cause of generating an abnormal sound with the edge 2.
Therefore, after bonding the conventional diaphragm main body 1 and the edge 2, as shown in
FIG. 8, the adhesive 9 is applied and reinforced as shown in FIG. 8 around the end face portion 1
of the diaphragm main body 1 to the edge 2. It was However, the fact that the adhesive 9 is
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accurately applied to the end face is necessary for the purpose of reinforcement, and at the same
time, when it is applied to the edge portion 2 from the application position, the edge 2 is
softened. The degree of change is a necessary condition to affect the characteristics of the
speaker. However, this reinforcement operation is generally performed by discharging the
adhesive 9 from the nozzle and applying it while rotating the swing plate main body 1. In this
case, the center of the diaphragm main body 1 should be accurately determined. The adhesive 9
can not be accurately applied to the outer peripheral portion of the diaphragm main body 1 with
a general automatic coating machine in which the application diameter is fixed. For this reason,
this work currently relies on the semi-automatic action of holding the adhesive application nozzle
by hand and controlling the application position, which presents problems in terms of mass
production efficiency of the speaker diaphragm and variations in characteristics. is there.
Therefore, the present invention is to provide a speaker diaphragm which aims to increase the
efficiency of reinforcement work at the manufacturing stage and reduce the influence of the
dispersion of reinforcement on the speaker characteristics. In order to solve the problem, in
order to solve this problem, in the present invention, an adhesive is applied to the end surface
portion of the outer peripheral portion of the diaphragm main body before bonding the
diaphragm main body and the edge, and then the diaphragm The main body and the edge are
adhered. Since the reinforcement of the outer peripheral portion of the diaphragm main body is
performed before bonding the diaphragm main body and the edge as described above, the
accuracy of the application position of the reinforcing adhesive is also relatively less restricted,
and the manual operation is simple. While the mass production efficiency is increased, the
influence of the displacement of the adhesive application position on the speaker characteristics
is eliminated. EXAMPLE A loudspeaker diaphragm in an example of the present invention will be
described below. As shown in FIGS. 2 and 3, the end face portion 10a of the outer peripheral
portion of the diaphragm main body 10 is coated with the reinforcing adhesive 11 in advance
before bonding with the edge. At the time of application of the reinforcing adhesive 11, for
example, the diaphragm main body 10 is fixed to the rotating body, and the movable roller
having the reinforcing adhesive 11 mounted on the surface to a predetermined thickness on the
outer peripheral end face portion lQ & It is possible to use a method in which the reinforcing
adhesive 11 is pressed onto the end face portion of the outer peripheral portion of the
diaphragm main body 1Q and the like. According to this method, the restrictions on the accuracy
of the seven centers during the rotation of the diaphragm main body 100 to be rotated are
considerably loose, and the time for setting can be shortened. FIG. 1 is a partial cross section
1111 after the diaphragm main body 10 subjected to the end face reinforcement and the edge
12 are bonded. 13 is an adhesive for bonding both of them, but the heat reactivated adhesive
polyamide-based adhesive 1 fat-coated on edge 12 is C, and thermal stress is applied And 1)
easily, if / e; i'i: l 13, it is possible to omit. Further, by using a heat reactivating adhesive as the
reinforcing adhesive 11 and bonding the both using a heat press, the adhesive strength between
the outer peripheral end face portion 10 'of the diaphragm main body 10 and the edge 12 is also
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improved. Can. The reinforcing adhesive 11 affects the flexibility of the edge 12 at the outer
peripheral end face portion IQ2L of the diaphragm main body 10 as compared with the case
where the reinforcement is performed after bonding the two members (FIG. 8). The influence can
be minimized, and since the reinforcing adhesive 11 does not adhere to the edge portion 12 at
the time of application and the same effect is not generated, the influence on the speaker
characteristics can be avoided.
Effects of the Invention As described above, according to the present invention, a reinforcing
adhesive is applied in advance to the end face portion of the outer peripheral portion of the
diaphragm main body, and the reinforcing work is performed by adhesively bonding an edge to
the diaphragm main body. It is possible to simplify the process and to improve the mass
production efficiency, and to improve the adhesive strength between the edge and the vicinity of
the end face of the outer peripheral portion of the diaphragm main body. Since the influence on
the degree is also very small, the influence on the characteristics of the speaker can be avoided,
and the reliability as the speaker diaphragm is also improved.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partially cutaway perspective view of a speaker diaphragm in an embodiment of the
present invention, FIG. 2 is a perspective view of the same diaphragm main body, and FIG. 3 is a
partially enlarged partially cutaway perspective view of the same diaphragm main body Fig. 4 is
an exploded perspective view of a conventional speaker diaphragm, Fig. 5 is a perspective view
of the same speaker diaphragm, Fig. 6 is an assembled sectional view of a general speaker, Fig.
10 · · · · Diaphragm main body 11, ······ Adhesive for reinforcement, 12 ··· Edge, 13 ··· Adhesive.
Name of Agent Attorney Nakao Toshio and others 1 person Figure 1 Figure 2 Figure 0 Figure 3
Figure 4 Figure 5 Figure 11 Figure 11
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