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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are explanatory views for explaining the
formation of a yoke cup, FIG. 3 'is a plan view of a yoke cup according to the present invention,
and FIG. 4 is a loudspeaker according to the present invention. FIGS. 5a and 5b are cross
sectional views of a conventional yoke cup. 1 ...... magnet, 2 ...... yoke cup, 7 ...... projections.
[Detailed description of the invention] Name of the invention Name of the device 4 structure of
the loudspeakers 2 Utility model climbing claims Pressed mold fCC of the press ? device formed
recess '(when refurbished molding' C formed At least 11 or more of the three or more projections
in the center bottom of the yoke cup are located at the bottom outer periphery of the magnet lI:
located at the bottom of the 4 loudspeakers. This old gird for a thin bag of axe relates to the
structure of the young part of the loudspeaker 4. The purpose is to press-mold the shape of the
yoke cup to set the magnet as the central power of the magnetic circuit. It is an object of the
present invention to provide a magnetic path of an expander designed to be obtained in a curved
manner (in particular, to provide a structure of a yoke cup that accommodates a magnet. In the
prior art, the lower end of the magnet is inserted into the yoke cup accommodating the barshaped magnet of the inner magnetic type magnetic path, and the lower end of the magnet is
fitted in the bottom of the center of the inner IJIIJ to define its integrated position. , Ring-shaped
projecting type l7-1 is a circle 1-?. The j-shaped recess is brightly heated, and such an annular
protrusion or circular recess is a yoke cup (C with which a disc-like material is press-molded or is
cut or raised by pressing or cutting, It is obtained by secondary processing such as providing a
piece and bending, and naturally there is a problem that the cost of engraving the yoke cup
becomes high. Father, it is necessary to have the largest magnetic flux density variation in
contact with the lower end of the magnet 1 as shown in Fig. 5 (a) and (b), as shown in Fig. 5 (a)
(b) In some cases, the thickness 1 of the central bottom of the yoke cup 2 is reduced, and the
magnetic flux density is reduced due to the increase of the magnetic resistance to reduce the
efficiency. This device solves the problem ?, and the details will be described below based on the
drawings that receive an example. The internal magnet type magnetic -1 path of the loudspeaker
is, as shown in FIG. 4, the magnet 1 of the rod # and the yoke cup 2 accommodating the same,
and the upper end of these are covered so as to cover the upper end thereof. 3 voice coils 4 or 5
located magnetic air gaps 5! An inner plate 5 and an outer plate 6 are provided. In order to
position the bottom surface 1a of the magnet 1 at the center of the inner bottom surface of the
yoke cup 2 at the center of the bottom 1lJ, at least three or more of the IC raised partially along
the outer periphery of the magnet bottom surface 1a. Protrusions 7 ... иииииииииииииииииииииииииииииии Provided
integrally with concentric circle r <and equally spaced 'C yoke cup, and the inside <magnet
bottom surface surrounded by these three projections h is fitted. The yoke cup 2 is molded as
shown in FIG. 1 to FIG.
That is, although the material A of the disk is pressed and suctioned by the upper metal 9B and
the lower mold C, three projections 7 of the statement are formed at a portion of the lower mold
B located on the bottom of the yoke cup. Form a recess 8 corresponding to. When pressing the
cup-shaped yoke cup 2 from the disk-shaped material A into a press-Fi type, a force in the
direction of contraction acts on the inside 1IIll of the yoke cup, and the direction of the outside
KH extension acts and molding distortion occurs around the inner bottom. Although it is easy,
the strain is absorbed by the recess 8 of the upper mold B by utilizing this in reverse 8-, -? ', and
the protrusion 7 is formed easily. There is no need to process the eyebrows, and it is a one-step
process, so the yoke cups have the effect of being heated at a low cost, and the meat cups of the
yoke cups are almost evenly cut in relation to no cutting. It is possible to take a large amount of
density change, and the performance is improved.
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jps55102288, description
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