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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sketch of the drive portion of the
conventional series-windable electromagnetic speaker, FIG. 2 is a cross-sectional view of the coil
of the conventional thin electromagnetic speaker, and FIG. It is a drive part of an electromagnetic
speaker using the coil of a figure, FIG. 4 is sectional drawing which showed one Example of this
invention, FIG. 5 is an application example. DESCRIPTION OF SYMBOLS 1 ... Magnetic core, 2 ...
Wire winding chuck part of magnetic core tip, 3 ... Coil, 4 ... Coil, 5 ... Magnetic core, 6 .. · · · ·
Magnet, 9 · · · frame · 10 · · · · · · · · · · · · · hole at the tip of the magnetic core provided on the
diaphragm side.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the tip shape of
the magnetic core of an electromagnetic speaker. Magnetic core 1 of the conventional
electromagnetic speaker is circular as shown in FIG. 2-To manufacture a low cost
electromagnetic speaker, the winding chuck portion 2 is provided at the tip of the magnetic core
1 Was. Therefore, it has the disadvantage that the electromagnetic speaker becomes thicker by
the length of the winding chuck. In the following, k to measure the unification of the
electromagnetic speaker, as shown in FIG. 2 (1) zn 'y, the coil 4 is manufactured first, and as
shown in FIG. Since it takes 10 times or more processing time as compared with the first figure, it
has a disadvantage of being a very expensive electromagnetic speaker. The present invention is
intended to eliminate the above-mentioned drawbacks and to provide a low-cost and thin
electromagnetic speaker. Hereinafter, the details of the present invention will be described based
on the drawings. FIG. 4 shows an embodiment of the present invention, wherein 6 is a magnetic
core, 7 is a coil, 8 is a magnet, 9 is an expanding frame, 10 is a diaphragm, and 11 is a feature of
the present invention. Hole at the tip of the core of Next, the operation will be described. By
providing the core tip sK hole 11, the hole 11 can be chucked at the time of winding using the
hole 11, and the coil 7 can be wound directly on the magnetic core 6. Can be wound without
lengthening. Also, the present invention can be widely applied to a booster coil of a piezoelectric
speaker as shown in FIG. As described above, according to the present invention, a coil can be
directly wound without providing a winding chuck portion on the magnetic core simply by
providing a hole at the tip of the magnetic core on the diaphragm side of the electromagnetic
speaker. It has the effect of being able to provide reduced electromagnetic speakers.
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