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DESCRIPTION JPH0448899

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DESCRIPTION JPH0448899
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a
speaker used for various audio devices and the like. 2. Related Art Recently, as a magnetic circuit
of a speaker, one having a configuration as shown in FIG. 3 is being developed and used. That is,
the pole piece 1 is incorporated in the cylindrical yoke 2, and the ring-shaped permanent magnet
3 magnetized in the radial direction is incorporated in the upper part of the pole piece 1, and the
magnetism is made between the permanent magnet 3 and the upper part of the yoke 2. It was
configured to form a gap 4. In the magnetic circuit of the above configuration, the dimensional
accuracy of the magnetic gap 4 is required to be ▒ 30 ?m, and in order to maintain this
dimensional accuracy, for example, an energy product of at least 30 meg gauss as a permanent
magnet 3 In the case of using a neon-iron alloy magnet having a ring shape, ring-shaped
permanent magnets are formed to form a ring-shaped permanent magnet, and then the diameter
is machined to have an accuracy of about ▒ 20 ?m, resulting in extremely high processing costs
It had become. Recently, it has been tried to mix magnet powder of rare earth with synthetic
resin and use permanent magnet 3 formed by resin molding, but it is satisfactory in terms of
dimensional accuracy, but it has the highest energy product Even if neon / iron alloy magnet
powder is used, it has an energy product of less than 10 Meggas elstedt, which is low in magnetic
energy, making it unacceptable for practical use. The present invention is intended to eliminate
the above-mentioned conventional defects, and has an object of providing a speaker having a
magnetic circuit with high dimensional accuracy (a magnetic circuit having a high magnetic flux
density at low cost). Means for Solving the Problems In order to solve the above problems, the
present invention provides an alloy magnet on the top of a pole piece in a yoke and a resin
magnet layer of at least 0.5 mm in thickness on the surface of the alloy magnet. A diaphragm is
incorporated in a frame coupled to the magnetic circuit, and a voice coil which is embedded in
the magnetic gap of the magnetic circuit is coupled to the diaphragm. Operation With the above
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configuration, it is possible to secure a sufficient magnetic flux density with the alloy magnet and
secure dimensional accuracy of the magnetic gap with the resin magnet layer. The following is an
example of the present invention, attached drawings, FIG. This will be described with reference to
FIG. In FIG. 1 and FIG. 2, reference numeral 5 is a magnetic circuit, and the magnetic circuit 5
comprises a yoke 6 having a magnetic metal formed in a substantially cylindrical shape, and a
magnetic metal assembled from the open bottom of the yoke 6. A T-shaped pole piece 7, a
radially magnetized cylindrical alloy magnet 8 formed by sintering or casting incorporated in a
small diameter portion 7 a at the top of the pole piece 7, a phase of the alloy magnet 8 and The
resin magnet layer 9 is formed to cover the upper surface and the upper surface of the pole piece
7.
The resin magnet layer 9 is prepared by mixing neon / iron alloy magnet powder with a synthetic
resin so as to be about 80 wt% and molding it so that it becomes about 1-about with a thickness
of 0.5 m or more by molding. If the thickness is less than 0.5 mm, the dimensional accuracy of
the surface of the alloy magnet 8 largely depends on the thickness. The alloy magnet 8 is fixed to
the pole piece 7 by press-in bonding, bonding or the like, and the pole piece 7 to the yoke 6 is
bonded by welding, bonding or the like. In the magnetic circuit 5 having such a configuration, a
magnetic gap 10 is formed between the upper portion of the yoke 6 and the resin magnet layer 9
on the outer periphery of the alloy magnet 8 in the upper portion of the pole piece 7. Accuracy of
▒ 30 ?m or less can be easily achieved. Further, a frame 11 is coupled to the magnetic circuit 5,
and a peripheral portion of the diaphragm 13 together with the gasket 12 is coupled to the
peripheral portion of the frame 11 by adhesion or the like. The voice coil 14 is coupled, the
middle part of the voice coil 14 is held by the damper 15, and the lower part of the voice coil 14
is not eccentric (embedded in the magnetic gap 10 of the magnetic circuit 5). Further, a dust cap
16 is attached to the upper surface of the central portion of the diaphragm 13. With the above
configuration, the alloy magnet 8 such as sintering or casting that is a high energy magnet can
be used without precision processing, and the resin magnet layer 9 that easily provides
dimensional accuracy is provided on the outer periphery thereof. Since the dimensional accuracy
of the magnetic gap 10 is high and the base of the permanent magnet is the alloy magnet 8, the
magnetic flux density in the magnetic gap 10 can be made equal to that of the surface precisely
polished with only the alloy magnet. Can be highly efficient. In the above embodiment, although
the one using the cone-shaped diaphragm 13 has been described, a dome-shaped diaphragm or a
flat diaphragm may be used, and The present invention can be applied to any speaker for bass,
middle tone and high tone. As described above, according to the present invention, since the
outer periphery of the alloy magnet is covered with a resin magnet layer, a speaker having a
magnetic circuit with high dimensional accuracy and high magnetic energy can be supplied at
low cost. The anti-corrosion effect of the magnet can be obtained, and the effect that the speaker
can be made highly efficient can be obtained, and the value of the system is great.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a half sectional view showing an embodiment of the speaker according to the present
invention, FIG. 2 is a sectional view of a magnetic circuit of the speaker, and FIG. 3 is a sectional
view of a magnetic circuit used for a conventional speaker.
5 ...... magnetic circuit, 6 ...... yoke, 7 ...... pole piece, 8 ...... alloy magnet, 9 ...... resin magnet layer,
10 ииииии Magnetic gap, 11 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 voice coil.
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