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2) Ministry of the Invention 3 '411 Work jlfIr] 1 ? ? 1 b. Osaka Prefecture Kadoma City Oza
Kadoshin 1006 Address Name J '+ и (582) Matsushita Electric Industrial Co., Ltd. No-yuki
Matsushita Shoji 4 Agent ? 571-l l, "Osaka j dy и Kad ? Oda Kadot 1006" [Phase] Japan Patent
Office, Japanese Patent Laid-Open Publication No. 0 Japanese Patent Application Laid-Open No.
52-236990 (1977), 2.22 unclaimed request for examination (all two pages)
Magnetic circuit
3. Detailed Description of the Invention The present invention relates to the improvement of a
magnetic circuit, and the magnetic circuit is constituted by a whisker of a ferromagnetic material
such as iron or nickel. First, the magnetic circuit of a conventional speaker of type U will be
described with reference to FIG. In the figure, 1 is a center ball, 2 is a lower plate, a is an upper
plate,-4 is a magnet, and 6 is a magnetic gap. The arrows indicate the directions of the magnetic
flux in the air gap and the magnetic flux around the center ball 1. P, Pil, PIl and 2 are permeance
of each part. In the circuit with this, Pg and Pg1 are almost equal, PL2 is a fraction of that, and
the same magnetic flux in the magnetic gap is PL. The plate 3 flows directly to the center ball 1
according to. For this reason, the utilization efficiency of magnetic flux is very bad. The cause of
this is PL, while the magnetic path of P12 is 1/2 circle between the plate and the center ball.
There is no magnetic path of 7 circles, so Pll is very large. Therefore, if Pft is made small enough
to make PJh equal to the value of ?2, the magnetomotive force loss due to the plate will be
small, and the leakage bar anth will be small, so the loss of magnetic flux will be small. Therefore,
with the same magnet volume, the magnetic flux density of the magnetic space '1II 6 can be
increased, and with the same magnetic flux density, the volume of the magne can be reduced.
The present invention is intended to improve the performance as described above. The same
parts as those in FIG. 21 "K are attached with the same reference numerals and an example is
shown. That is, in the present invention, as shown in FIG. 3, iron whiskers are bundled and used
as a center ball 1 '. This iron whisker is a thin single crystal of iron, and has EndPage: 1 very
strong anisotropy so as to be magnetized only in the axial direction as shown in FIG. If the
whiskers are bundled in this way as shown in FIG. 3, the magnetic permeability is very small in
the direction perpendicular to the axial direction of the center ball 11, and the Pll magnetic path
becomes long as shown by the broken line in FIG. (Magnetic resistance is large), loss is small and
power. The whisker is not limited to iron, and any soft magnetic material such as two or kel may
be used. As described above, according to the magnetic circuit of the present invention, the
magnetic resistance of the magnetic gap becomes extremely hot and the loss is small. If you use
it, you can increase its efficiency.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of a conventional speaker
magnetic circuit, w, 2 are cross-sectional views of one embodiment of a speaker magnetic circuit
of one embodiment according to the present invention, and FIG. FIG. 4 is a sectional view of the
center ball, and FIG. 4 is a perspective view of a whisker. 1.1 ? ииииииии Center ball, 2
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии иии ?? Chance. Name of agent
Attorney Nakao Toshio Nakao has 1 person Figure 3 a ~ 6 Inventors other than the above and
agents (convex) и agents EndPage: ?
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