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JPH0626393

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DESCRIPTION JPH0626393
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker unit in which an outer peripheral edge of a diaphragm such as a cone speaker is
attached to a frame through an edge.
[0002]
2. Description of the Related Art FIG. 3 is an enlarged cross-sectional view showing the vicinity of
an edge 22 of a typical prior art cone speaker 21, and FIG. 4 is a cross-sectional view of the cone
speaker 21. The magnetic circuit of the cone speaker 21 is an external magnet type in which an
annular magnet 25 is held by the pole piece 23 and the plate 24, and the frame 26 is attached to
the plate 24. In the gap between the pole piece 23 and the plate 24, a bobbin 28 around which
the voice coil 27 is wound is disposed supported by a damper 29 attached to the frame 26. The
proximal end of the cone 30 is attached to the front end of the bobbin 28. The outer peripheral
edge portion 30a of the cone 30 is connected to the radially inward portion 22a of the edge 22,
and the radially outer portion 22b of the edge 22 is sandwiched and fixed by the frame 26 and
the gasket 32. A dust cap 31 is attached to the front end of the bobbin 28.
[0003]
A plurality of insertion holes 33 are provided in the gasket 32 of the cone 30 of the cone speaker
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21. A mounting hole 38 is provided below the insertion hole 33, and a screw 35 is used to fix the
hole. I do. The damper 29 is formed, for example, by impregnating a cloth with phenol or resin,
and the like. Further, a corrugation 29 a is formed concentrically with the bobbin 28 in the
damper 29, and thus the braking effect of the cone 30 is obtained.
[0004]
In the conventional speaker unit, the gasket 32 and the edge 22 are often made of different
materials and are separate parts. Therefore, since the above-mentioned two parts are connected
by adhesive etc., the process for connection was needed and it had the subject that work
efficiency is bad. In addition, since the gasket 32 and the edge 22 connect different parts,
resonance may occur when the speaker is driven.
[0005]
An object of the present invention is to provide a speaker unit in which the work process can be
reduced by integrally molding the edge and the spacer.
[0006]
SUMMARY OF THE INVENTION According to the present invention, an edge for displacing an
outer peripheral edge of a diaphragm in an axial direction of the diaphragm and an outer
peripheral edge of the edge are closely attached to a frame. The speaker unit is integrally formed
of a rubber member.
[0007]
According to the present invention, the edge supporting the outer peripheral edge of the
diaphragm in the axial direction of the diaphragm and the spacer for bringing the outer
peripheral edge of the edge into close contact with the frame are rubbers. Integrally formed by a
product made member.
Therefore, the number of parts can be reduced, the number of processes for assembly can be
reduced, and the productivity can be improved.
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[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an enlarged sectional
view showing the vicinity of an edge 2 of a cone speaker 1 according to an embodiment of the
present invention, and FIG. 2 is a sectional view of the cone speaker 1. As shown in FIG.
The magnetic circuit of the cone speaker 1 is an external magnet type in which an annular
magnet 5 is held between the pole piece 3 and the plate 4, and the frame 6 is attached to the
plate 4. In the gap between the pole piece 3 and the plate 4, a bobbin 8 around which a voice coil
7 is wound is disposed supported by a damper 9 attached to a frame 6. At the front end of the
bobbin 8, the base end of the cone 10, which is a diaphragm, and the dust cap 11 are attached.
The outer peripheral edge portion 10 a of the cone 10 is connected to the radially inward portion
2 a of the edge 2, and the radially outward portion 2 b of the edge 2 brings the frame 6 into
close contact. The edge 2 is formed integrally with the gasket 12 with a rubber material.
[0009]
A plurality of insertion holes 13 are provided in the gasket 12 of the cone 10 of the cone speaker
1, and a mounting hole 18 is provided below the insertion hole 13. The screw 15 inserted from
the insertion hole 13 is fitted into and fixed to the mounting hole 18.
[0010]
In the present invention, since the gasket 12 and the edge 2 are integrally molded using a rubber
material, the number of parts can be reduced. In addition, since the process of connecting two
parts is not necessary, the number of assembly processes can be reduced, and the productivity
can be improved. Furthermore, the resonance generated by connecting the gasket 12 and the
edge 2 can also be prevented by integral molding.
[0011]
In the present embodiment, it is premised that screw fixation is performed from the front surface
of the cone 10 with the screw 15. However, screw fixation from the rear may be used, and screw
fixation from the front surface may be used. A thin film that covers the insertion hole 13 and
hides the screw 15 may be integrally formed with the gasket 12 and the edge 2.
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[0012]
As described above, according to the present invention, in the speaker unit, an edge for
displacing the outer peripheral edge portion of the diaphragm in the axial direction of the
diaphragm, and the outer peripheral edge portion of the edge The number of parts can be
reduced by integrally forming a spacer for bringing the frame into close contact with the frame
by a rubber member.
In addition, when the edge and the spacer are separate parts, a process for connecting them is
required, but the integral molding can also reduce the number of work processes. Therefore, the
productivity is improved.
[0013]
Further, since the integral molding eliminates the connection portion, the occurrence of
resonance can be prevented.
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