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The present invention relates to a speaker used for various audio devices. In general, as shown in
FIG. 1 and FIG. 2, the speaker has a frame 6 having a window 6 in a magnetic circuit 4 formed of
a plate 1 having a center pole, a ring magnet 2 and a ring top plate 3 as well The vibration
system parts such as the diaphragm 7 and the voice coil are incorporated in the frame 6. The
window hole 6 provided in the frame 6 with such a configuration is for releasing the air on the
back surface of the diaphragm 7 to the outside of the frame 6 to move the diaphragm 7 or
immediately. However, for dustproof measures when used as an in-vehicle speaker or an outdoor
speaker, or when a low to high frequency speaker is incorporated in one box together with a low
frequency speaker, modulation is performed by receiving the back pressure of the low frequency
speaker It was necessary to close the window hole 6 with a material such as felt or cloth as an
acoustically open square in the speaker. However, the work of pasting materials such as felt and
cloth becomes difficult because the felt is slipped or turned up, the variation of the material is
large, the dust resistance and the air permeability become unstable, and the unstable element is
also used as the speaker performance. It was an increase. In addition, materials such as felt and
cloth have problems in terms of weatherability and the like for long-term use. The present
invention is intended to eliminate the above-mentioned conventional drawbacks, and it is an
object of the present invention to provide a speaker which is easy to incorporate a porthole
material and has a high reliability. In order to achieve the above object, according to the present
invention, the closing window material is made of a synthetic resin having an air permeability of
30 to 40% in porosity, and this closing window material can be connected to the window holes of
the frame. It is a feature. Hereinafter, an embodiment of the present invention will be described
with reference to FIGS. A magnetic circuit 8 includes a plate 10 having a center ball 9, a ringshaped magnet 11, and a ring-shaped upper plate 12. A frame 14 having a window 13 is
provided in the magnetic circuit 8. It is combined. A gasket 16 and a diaphragm 160 are coupled
to the periphery of the frame 140. A voice coil 17 is coupled to a central portion of the
diaphragm 16, and an intermediate portion of the voice coil 17 is held by a damper 18. The
lower portion of the voice coil 17 is mixed with the magnetic gap 19 of the magnetic circuit 8
without eccentricity, and the dust camp 20 is attached to the upper surface of the central portion
of the diaphragm 16. Then, in the window holes 13 of the frame 14, a blockage material 21
having a porosity of 30 to 40, which is made of a foamable synthetic resin having open cells such
as polyethylene, polypropylene, polymethacrylic resin, polyvinyl chloride, etc. Are combined.
The closure window member 21 may have a plurality of engagement pieces 21ai to be pressfitted into the window hole i3 as shown in FIG. 4, and as shown in FIG. The configuration may be
such that the portion 21 b is provided. Such a closing window member 21 can be easily obtained
by molding, and the bonding to the window hole 13 can also use a press-in and an adhesive in
combination. As described above, since the speaker according to the present invention is
configured, the plugging window material can be easily and reliably incorporated, and
displacement and floating can be prevented, and dust resistance and air permeability can be
reliably maintained as prescribed. It is stable for long-term use and has the advantages of being
able to stabilize the performance of a speaker as a □ □, etc., and is a dog of industrial value.
Brief description of the drawings
1 is a front view showing a general speaker, FIG. 2 is a side view, FIG. 3 is a half sectional view
showing one embodiment of the speaker of the present invention, and FIG. 4 is a sectional view
of the main part FIG. 6 is a cross-sectional view of the main part of another embodiment.
8,,,,, Magnetic circuits, 13,,,,,,,,, * @ @ D @ l frame, 16, ..., diaphragm, 17 □ 10. . ボイスコイル、
1B、、、、、、ダンパー、19、、、、、。 Magnetic Gibbs, 20, ..., Dust caps, 214 @ I + $
116, Window material, 21 a, ..., Engaging lugs, 21b. ..... Coupling projection. Name of agent
Attorney Nakao Toshio One other person Figure 1? Figure 2 Figure 3 Figure 15 Figure 4 Figure 5
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description, jps58161600
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