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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a magnetic
circuit for an internal magnet type speaker according to an embodiment of the present invention,
FIG. 2 is a plan view of the same circuit, and FIG. FIG. 1: Yoke, 3: Permanent magnet, 4: Hole
piece, 8: Convex part of yoke, 9: Indentation of magnet. Correction 54.1. 30
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic circuit
for an internal magnet type speaker using a rectangular yoke, and relates to improvement of the
characteristics and the assemblability using a powder sintered permanent magnet material
having a low permeability. For example, a powder-sintered magnet is mixed with barium
carbonate or strontium carbonate, and calcined to form a so-called ferrite compound, and then a
pulverizer to form a fine powder, which is anisotropically formed by pressing in a magnetic field.
Make a sculpture. It is known that the ferrite magnet material and the manufacturing method are
a wet forming method in the case of interposing a fluid at the time of pressing in a magnetic
field, and a ritual method in the case of not interposing a fluid. It becomes a permanent magnet
which is sintered after being molded by a molded body company press and processed into a
predetermined shape and used, but the application of the magnetic field in the press in a curved
magnetic field is better, the structure of the mold, etc. A permanent magnet having a
ferromagnetic surface and a weak surface is obtained in In the case where an inner magnet type
magnetic circuit for a speaker is constituted by the magnet, the effective magnetic flux changes
in the speaker magnetic circuit depending on the arrangement of the ferromagnetic surface or
weak magnetism, and the performance of individual speaker magnets varies in industrial
production. There are drawbacks that contribute. SUMMARY OF THE INVENTION The present
invention provides a magnetic circuit for an internal magnet type speaker which solves the
above-mentioned drawbacks and improves the performance of permanent magnets and the
assembling operation of components for magnetic circuits. FIG. 1 is a longitudinal sectional view
of a magnetic circuit, and FIG. 2 is a top plan view thereof. 5 is a cross-sectional view showing a
part of the still 1 cross section of FIG. A yoke 1 is a square having a pole piece hole 2 at the
center of the upper part, and a square ferrite magnet 3 is fixed to the inner bottom of the yoke,
but the ferromagnetic surface a generated at the time of molding of the magnet is opposite to the
hole piece 4a side The weak surface of the surface bt-yoke 1 is placed. In addition, to make the
discrimination of the ferromagnetic surface a easy, it is necessary to make the concave portion 9
in the weak magnetic surface of the permanent magnet on which the irregularities are provided
in advance in the mold at the time of molding. Further, the position of the permanent magnet can
be easily determined and the shortening of the assembly can be facilitated by utilizing the recess
9 in the weak magnetic surface-4 is a pole piece, and the permanent magnet 30 has a
ferromagnetic surface a and the bottom 4a of the pole piece Are fixed to the center as shown in
FIG. Although it has been described in the drawing that one concave portion is provided on the
weak magnetic surface of the permanent magnet, the concave portion may be provided on the
ferromagnetic surface side, and the center pole 4 may be provided with a convex portion. Other
irregularities can be selected freely. Although a ferrite magnet is described in the present
invention, it is also possible to use a permanent magnet which requires a step of molding in a
magnetic field prepared by powder metallurgy.
As described above, if the present invention is implemented, the following effects can be
obtained. (1) By setting the ferromagnetic surface of the permanent magnet on the center pole
side, effective magnetic flux can be concentrated in the gap of the Ship piece piece. By providing
the concave portion on the weak magnetic surface of the permanent magnet, the front and back
surfaces of the magnet can be easily distinguished, and the characteristic improvement of the
ferromagnetic surface can be effectively used. (3) The recess of the magnet and the protrusion of
the inner bottom of the yoke fit to fix the magnet, assembly position, time is greatly shortened
and quality and working efficiency are improved, (4) fitting of the magnet and the yoke
Variations in the gap between the pole piece hole and the center pole are extremely reduced.
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jps5579191, description
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