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DESCRIPTION JPS55148295

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DESCRIPTION JPS55148295
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing a general
speaker, FIG. 2 and FIG. 3 are sectional views showing the operation state of the main part of a
conventional speaker, and FIG. FIG. 5 is a sectional view of the upper plate in one embodiment of
the speaker, FIG. 5 is the same sectional view, FIG. 6 is a sectional view of the main part showing
the operation state of the speaker of the present invention, FIG. FIG. 9 is a sectional view of the
upper plate of the example. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · ........ ... extrusion part.
DETAILED DESCRIPTION OF THE INVENTION The present invention seeks to provide a speaker
that can be made low in distortion even with a narrow width whistle coil by modifying the top
plate. In general, a plate 2 having a center ball 1 as shown in FIG. / &, 12. The frame 6 is
connected to the magnetic circuit 5 constituted by the link 2 and the magnet 3 and the link-like
upper plate 4, and the peripheral edge of the cone-shaped diaphragm 80 is bonded with the cask
The voice coil 9 is coupled to the central portion of the diaphragm 8 and the middle portion of
the voice coil 9 is held by ++ ladder / par 10 and the lower portion of the whiss coil 9 is eccentric
to the magnetic cap 11 of the magnetic circuit 5 The dust cap 12 is attached to the central upper
surface of the diaphragm 8. When such a speaker is used as a full range first, the winding width
of the coil 9a of the voice coil 9 is made as narrow as possible to reduce the mass and enable
high range reproduction. However, in the conventional loudspeaker, as shown in FIG. 2 and FIG.
3, the upper flat 4 of the magnetic circuit 5 is formed in a ring as a flat plate, so the static state
shown in FIG. Then, the coil 9a of the coil 4 is scattered into the magnetic cap 11, but as shown
in FIG. 3, in the operating state, the coil 9a is pulled out of the magnetic coil 11 and the magnetic
flux is uniform. Instead of being added to the coil 9a, distortion has tended to occur in the highpitched bass range. The present invention eliminates the above-mentioned conventional
drawbacks. Hereinafter, an embodiment of the present invention will be described with reference
to FIG. 4 to FIG. The configuration as a speaker is the same as that shown in FIG. 1, and the upper
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plate 4 to which the improvement is added will be described below. First, as shown in FIGS. 4 and
6, extrusions 13 are provided on the inner periphery of the upper grate 4 downward or upward
at predetermined intervals and further in the vertical direction to make it appear as the magnetic
cap 11 of the magnetic circuit 5 The upper depth dimension is enlarged. Therefore, in the
magnetic circuit 5 using the upper plate 4, the coil 9a of the voice coil 9 has the magnetic gap 11
even in the stationary state shown in FIG. 6 or in the amplitude state of the low band shown in
FIG. It does not pull out from it, and a uniform magnetic flux is always applied, and distortion
does not occur in the low range. Of course, the width of the coil 9a (7) of the voice coil 9 can be
narrowed to reduce the weight, and even if the upper plate 4 does not use a large material
thickness, the apparent depth of the magnetic gear knob 11 can be obtained Of the material cost
and increase in size and weight of the magnetic circuit 5 are also prevented.
Further, as the upper grate 4, as shown in FIGS. 8 and 9, a wave-shaped extruded portion 13 may
be formed on the inner peripheral edge. As described above, the loudspeaker according to the
present invention can increase the apparent depth of the magnetic cap by providing the
extrusion at the inner peripheral edge without increasing the thickness of the upper plate, and
for the narrow range full-range Also in the speaker, it can be prevented that the coil of the wheel
4 or the coil of the magnetic gear knob is pulled out from the magnetic gear knob to become
distorted, and it has advantages such as low cost and excellent quality, and practical value The
dog of
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