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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional front view of a conventional
low leakage magnetic flux type speaker, FIG. 2 is a half sectional front view showing one
embodiment of the low leakage magnetic flux type speaker of the present invention, FIG. Is a half
sectional front view of the same magnetic circuit. 13 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 и и и и и и и и и и и и и и и и и и и и и synthetic resin, 18 ииииииии Magnetic
circuit, 19 ииииии Frame, 21 ииииии Diaphragm, 22 иии Voice coil, 24 иии Magnetic gap.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-leakage flux
type speaker using an outer peripheral portion of an external magnetic type magnetic circuit
molded with synthetic resin mixed with magnetic powder. irt / 'j32 It is extremely difficult to
obtain an alnico magnet due to a shortage of articles in the acupuncture industry in recent years,
so it is extremely difficult to obtain an alco magnet in a loudspeaker using an alnico magnet
mainly composed of aluminum, nickel and cobalt. It is extremely expensive to use the magnetic
circuit of. As is well known, the inner magnetic type magnetic circuit is constructed by arranging
columnar alnico magnets in a yoke, and thus is very effective for a television receiver that
handles electron beams as having a small magnetic flux leakage. However, due to the shortage of
raw materials such as cobalt, speakers using an alnico magnet are now extremely expensive in
terms of cost and can not be supplied in large quantities. Because of this, it has become
necessary to use a speaker having an external magnetic circuit of a configuration in which a ringshaped ferrite magnet is held between plates. However, since this external magnetic type
magnetic circuit is exposed by the ferrite magnet 3 Gnenot, there is a large amount of leakage
magnetic flux, making it extremely difficult to use the first television receiver. From such a thing,
a low leakage flux type speaker as shown in FIG. 1 has recently been developed. In FIG. 1, 1 is a
frame made of a magnetic material such as iron, and a bottomed 7-galvan portion is integrally
formed at the bottom of the frame. A plate 3 having a center sale 2 at the center, a ring-shaped
ferrite magnet 4 on the plate 3, and an external magnetic magnet of an upper plate 6 ring-shaped
on the ferrite magnet 4 The circuit 6 is disposed and fixed, the voice coil 8 is inserted into the
magnetic side gear knob 7 of the magnetic circuit 6, the middle portion of the voice coil 8 is held
by the damper 9, and the upper end thereof is vibrated. The diaphragm 10 is bonded, the
peripheral edge of the diaphragm 100 is adhesively bonded to the peripheral edge of the frame 1
together with the gasket 11, and the dustproof sensor 12 is attached to the upper surface of the
central portion of the diaphragm 1 ░. It was According to this configuration, since the frame 1
made of a magnetic material is present at the outer peripheral portion of the magnetic circuit 6,
the leakage flux from the ferrite magnet 4 is shielded by the frame 1 and the magnetic flux
leaking to the outside is extremely small. There is an effect that it can be equal to or higher than
that of a speaker equipped with a circuit.
However, because of the special configuration and shape as described above, there is a
disadvantage that it takes time and effort and is disadvantageous in cost. The increase in size of
the qVrC frame 1 is disadvantageous in terms of cost and significantly in weight. As described
above, the present invention eliminates the conventional drawbacks. Hereinafter, an embodiment
of the present invention will be described with reference to FIG. 2 and FIG. 13 is a plate having a
center pole 14 at the center of the upper surface, and a ring-shaped ferrite magnet 15. The upper
plate 16 similarly formed in a ring shape is disposed, and these are positioned and set in a
molding die, and molded with a synthetic resin 17 mixed with magnetic powder such as iron
powder on the outer peripheral portion thereof to form a magnetic circuit Make 18 b. The frame
19 is connected to the surface J of the magnetic circuit 18, and the periphery of the cone-shaped
diaphragm 21 is connected to the periphery of the frame 19 by adhesive glue. A voice coil 22 is
coupled to a central portion of the diaphragm 21 and an intermediate portion thereof is held by a
damper 23 to be eccentrically fitted to the magnetic sensor 24 of the magnetic circuit 18. Then, a
dust cap 25 is attached to the central upper surface of the moving plate 21. Thus, the plate 13 as
the magnetic circuit 18 and the magnets 16. Since the outer periphery of the upper plate 16 is
molded with the synthetic resin 17 containing magnetic powder, the leakage flux from the
magnet 15 is sold with the synthetic resin 17 containing magnetic powder and fed to the plate
13 or -L portion plate 16 Leakage to the outside 6 is significantly reduced. When magnetic
powder is concentrated on the outer peripheral surface portion of the synthetic resin 17 by
applying centrifugal force or magnetic force at the time of molding of the synthetic side fat 17,
the leakage magnetic flux can be further reduced. Further, the mixing amount of the magnetic
powder can be changed depending on the application, and the magnetic circuit constant can be
controlled within a certain range. As described above (C low-leakage flux type speaker with C if
configured, it is possible to reduce the leakage flux from the magnetic circuit, and it is not
necessary to adopt a special frame, which results in cost and weight. In addition to the
advantages of making the protection of the magnetic circuit and making it easy to assemble, it is
a dog of practical value.
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jps55155193, description
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