JPH0593195

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DESCRIPTION JPH0593195
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for various audio equipment.
[0002]
2. Description of the Related Art A conventional electrodynamic loudspeaker has a structure as
shown in the sectional views of FIGS. In FIG. 5 and FIG. 6, 2 is a ring-shaped magnet held
between the upper plate 1 and the lower plate 3 to constitute a magnetic circuit 4. A frame 5 is
coupled to the magnetic circuit 4, an edge 7 of a cone-shaped diaphragm 6 is coupled to a
peripheral portion of the frame 5, and a voice coil 8 is coupled to a central portion of the
diaphragm 6. The middle part of the voice coil 8 is held by the damper 9 and the lower part of
the voice coil 8 is fitted into the magnetic gap 10 of the magnetic circuit 4 without eccentricity,
and the dust cap 11 is attached to the upper surface of the central part of the diaphragm 6 . A
cushioning material 13 is pasted on the edge 7 coupled to the frame 5 in order to keep the front
grill 12 in a sealed state.
[0003]
In such a speaker, eccentricity may occur when the cushioning material 13 is pasted on the outer
periphery of the edge 7. In this case, the sealing with the front grille 12 becomes insufficient.
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There was a problem of causing air leakage. In addition, the attachment of the cushion material
13 requires an increase in the number of parts and a process for attaching the same, which
causes an increase in cost.
[0004]
The present invention solves the above-mentioned problems and aims to provide a speaker that
eliminates the cushioning material, further improves the sealing with the front grille, and
prevents air leakage.
[0005]
SUMMARY OF THE INVENTION In order to solve this problem, the present invention is
constructed such that the thickness is made thicker than that of the edge movable portion at the
portion joined to the frame of the edge movable portion of the diaphragm. Is
[0006]
By this configuration, the sealing property with the front grille can be enhanced and air leakage
can be prevented.
Moreover, the cushion material conventionally stuck to the junction with the front grille can be
eliminated.
[0007]
An embodiment of the present invention will be described below with reference to the drawings.
1 and 2 show a first embodiment of the present invention. In FIGS. 1 and 2, 14 is a ring-shaped
upper plate made of iron, 15 is a ring-shaped magnet, and 16 is iron. These form the magnetic
circuit 17 with the lower plate. The bottom of the frame 18 is connected to the upper surface of
the magnetic circuit 17, and the edge 20 of the cone-like diaphragm 19 made of foam such as
urethane is connected to the peripheral edge of the frame 18 The front grill 25 is joined to a
portion 20a where the thickness of the portion joined to the frame 18 is thicker than the edge
movable portion. A voice coil 21 is coupled to a central portion of the diaphragm 19, and an
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intermediate portion of the voice coil 21 is held by a damper 22, and a lower portion of the voice
coil 21 is engaged with the magnetic gap 23 of the magnetic circuit 17 without eccentricity. A
dust cap 24 is attached to the upper surface of the central portion of the diaphragm 19 to
constitute a speaker.
[0008]
As described above, according to the present embodiment, by making the thickness of the
portion joined to the frame 18 on the outer periphery of the edge movable portion thicker than
that of the edge movable portion, the sealing property with the front grille 25 is enhanced to
prevent air leakage. be able to. Furthermore, the cushioning material that has conventionally
been attached to the joint with the front grille can be eliminated, and productivity can be
improved, so an inexpensive and high-performance speaker can be obtained.
[0009]
Next, a second embodiment of the present invention will be described with reference to the
drawings. In FIG. 3 and FIG. 4, the same parts as those in FIG. 1 and FIG.
[0010]
In this embodiment, the joint portion with the front grill 25 is a concave portion 20b in a portion
20a where the thickness of the portion joined to the frame 18 on the outer periphery of the edge
movable portion is thicker than that of the edge movable portion.
[0011]
By this structure, the sealing property with the front grille 25 can be further enhanced.
[0012]
As described above, according to the present invention, the sealing property with the front grille
is enhanced by making the thickness of the portion joined to the frame of the edge movable
portion of the diaphragm thicker than the edge movable portion, Air leakage can be prevented.
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In addition, by forming the joint portion with the front grille in a concave shape in a portion
thicker than the edge movable portion, sealing with the front grille can be further enhanced.
Furthermore, the cushioning material that has conventionally been attached to the joint with the
front grille can be eliminated, and productivity can be improved, so an inexpensive and highperformance speaker can be obtained.
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