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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an internal magnet
type speaker, and FIG. Figure 3 is a cross-sectional view of the speaker according to the present
invention, and Figure 4 is a cross-sectional view showing the insertion position of the jig: frame,
1a, ... bottom, 1b, ... и Cylindrical part, lc "и и и Conical part 2 и и и и и и и и и и и и и и и и и и и и и 7 Livated
magnet 1.4 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
5 ..... Jig.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-leakage flux
type speaker having a configuration in which a field section is disposed at the inner bottom of
the speaker, and q and 2 are generated from the field section by devising the shape of the lower
portion of the frame. Is intended to shield the leaked magnetic flux by the shield cover part of the
frame and to provide a speaker with very little leakage to the outside, and also to fix the center
around the inner bottom of the field part and the frame, an automatic assembly machine It is
aimed to be able to position easily and accurately and to reduce the cost. In recent years, alnico
magnets have often been used for magnets for speakers, but the amount of reserves of metal
bodies such as nickel and cobalt, which are the main raw materials of alnico magnets, is
decreasing, and they are becoming extremely expensive. For this reason, barium ferrite magnets,
which are less expensive than alnico magnets, are being reconsidered. Barium magnets are
characterized by having a coercivity as large as about 2 to 6 times and a residual magnetic force
as small as 1 to 1 to 6 times as large as that of alnico magnets, so the shape of the magnet is
inevitable, and the cross-sectional area Is large and short. Therefore, the structure of the field
section using a barium ferrite magnet is preferably an external magnet type [FIG. 2] instead of
the internal magnet type [FIG. 1] which was preferably used when using an alnico magnet.
Although it is used as a thing, a large amount of leakage flux is generated due to its structure.
When such a speaker is used for a color television or a radio cassette, it acts on a cathode ray
tube or an electronic circuit to cause a drawback that desired performance can not be obtained.
Next, an embodiment of the present invention which has an easy-to-assemble construction which
solves the above-mentioned disadvantages will be described with reference to FIGS. FIG. 3 shows
a lower portion 1a of a frame 1 made of magnetic material such as iron, and a cylindrical portion
1b extending vertically from the outer edge of the bottom portion and a conical portion 1c
further extending in the opening direction from the end of the cylindrical portion A ring-shaped
ferrite magnet 8 is disposed on the plate 2 equipped with a pole piece Ir at the center on the
inner bottom of the shield cover, and the KII ring on the ferrite magnet 3 is disposed on the inner
bottom of the shield cover. It is a speaker having a structure in which a field portion configured
by arranging a top plate 4 in a shape of a ring is fixed, and a moving image system component
such as a diaphragm, a voice coil, and a damper is incorporated in this field portion and frame. In
the speaker rc of such structure, the magnetic flux leaking to the outside of the company's field
section is cut from the ferrite magnet 3 in the ring 4 shape from the ferrite magnet 3 to the
outside of the plate 2 and the cylinder 1b sequentially from the bottom 1a of the frame l. Most of
the magnetic flux leaked to the outside of the field section passes through a loop which reaches
the conical section 1c and is absorbed by the upper plate 4 through the air and fed back to the
other pole of the ring-shaped ferrite magnet 8; Further, leakage to the outside of a portion of the
shield cover can be extremely reduced.
Further, since the cylindrical portion 1b is provided on the lower outer periphery of the frame 1,
the jig 5 can be darkly positioned between the outer peripheral surface of the field portion and
the inner wall surface of the cylindrical portion 1b and positioned accurately. It is a frame with a
very convenient shape when positioning and fixing the part and the frame.
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