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DESCRIPTION JP2000032590

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DESCRIPTION JP2000032590
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker suitable for application to a small speaker.
[0002]
2. Description of the Related Art Conventionally, as a small-sized speaker, one as shown in FIG. 3
has been proposed. As shown in FIG. 3, this speaker comprises a ring magnet 1 having N and S
poles magnetized in the vertical direction, a ring plate 2 mounted so as to sandwich the ring
magnet 1, and a center pole 3a. A yoke 3 integrally formed with the flange 3 b is provided, and a
magnetic gap 4 is formed between the inner peripheral side of the plate 2 and the center pole 3 a
of the yoke 3.
[0003]
A speaker frame 5 is attached to the plate 2 and an edge 7 is provided on the outer peripheral
portion of the diaphragm 6. The outer peripheral portion of the cone-shaped diaphragm 6 is held
by the frame 5 by the edge 7 ing. 8はガスケットである。
[0004]
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On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
diaphragm 6, and a voice coil 10 is wound around the voice coil bobbin 9. The voice coil 10 has a
plate 2 and a center pole 3a of the yoke 3. Are inserted into the magnetic gap 4 formed by
[0005]
Further, in FIG. 3, reference numeral 11 denotes a damper for holding the voice coil 10 in the
magnetic gap 4.
As the damper 11, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
[0006]
Reference numeral 12 denotes an input terminal, and an acoustic signal from the input terminal
12 is supplied to the voice coil 10 through the tinsel wire 13. Reference numeral 14 denotes a
dust intrusion preventing cap which covers the upper surface of the voice coil bobbin 9.
[0007]
As shown in FIG. 3, in the speaker, a magnetic circuit is configured by ring magnet 1 → plate 2
→ magnetic gap 4 → center pole 3 a of flange 3 → flange 3 b → ring magnet 1. Since the plate 2
and the flange 3b of the yoke 3 have different polarities, there is a disadvantage that the
magnetic flux flows directly from the plate 2 to the flange 3b of the yoke 3 to generate a leakage
flux.
[0008]
A speaker using a canceling magnet as shown in FIG. 4 has been proposed as a speaker for
eliminating such a leakage flux.
The parts corresponding to those in FIG. 3 will be assigned the same reference numerals as those
in FIG. In FIG. 4, a ring-shaped cancel magnet 15 magnetized in the direction opposite to the
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main drive magnet 1 is attached in the vicinity of the lower surface outer periphery of the flange
3 b of the yoke 3 in FIG. The bottomed cylindrical shield cover 16 is attached in such a manner
as to cover the above, so as to eliminate the leakage flux. Others are configured as in FIG.
[0009]
Such a speaker as shown in FIG. 4 requires a cancel magnet 15 in order to make it magnetically
shielded, and the cancel magnet 15 is reverse to the main magnet 1. It is necessary to magnetize
in polarity and adhere to the back surface of this main magnet 1, and also to provide a magnetic
shield cover 16. The magnetic circuit becomes large and the magnetic force (magnetic flux) of
the magnetic circuit of the magnetic shield type speaker There was a disadvantage that the
[0010]
In view of the foregoing, the present invention proposes a speaker in which a magnetic shield
type speaker is obtained with a simple configuration and the magnetic force (magnetic flux) of
the magnetic circuit is increased.
[0011]
SUMMARY OF THE INVENTION In the speaker according to the present invention, the center
pole and the flange are integrally formed of a plastic magnet, and a pole piece is provided on the
center pole, and on the flange in the direction opposite to the center pole. A ring-shaped magnet
magnetized is provided centering on the center pole, and a plate is provided on the ring-shaped
magnet, and has a magnetic circuit in which a magnetic gap is formed between the pole piece
and the plate. A bottomed cylindrical shield cover is provided to cover up to the plate.
[0012]
According to the present invention, the center pole and the flange are integrally formed of a
plastic magnet and a ring magnet is provided on the flange, and the magnetic flux from the
magnet is a ring magnet → plate → magnetic gap → pole piece → Center pole → flange → flow
like a ring magnet, the same pole will come in contact with the shield cover, and a simple
configuration that does not require a cancel magnet, a magnetic shield type speaker can be
obtained and it is thinner by that amount It becomes a speaker.
[0013]
Further, in this magnetic circuit, since the center pole and the flange are magnetized and the
ring-shaped magnet is provided, the magnetic force is increased accordingly, and the resonance
acuity Q at the lowest resonance frequency of the speaker is reduced. It is possible to easily
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3
expand the bass reproduction band by using a small speaker box.
[0014]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the speaker
according to the present invention will be described below with reference to FIG.
In FIG. 1, parts corresponding to FIG. 3 are given the same reference numerals.
[0015]
In this embodiment, as shown in FIG. 2, a flanged center pole 20 obtained by integrally molding
the center pole 20a and the flange 20b with a plastic magnet is used, and a circle is formed on
the tip of the center pole 20a of the flanged center pole 20. The plate-like pole piece 21 is
adhesively fixed.
[0016]
As shown in FIG. 2, the flanged center pole 20 is formed of an isotropic plastic magnet, and a
magnetic field is applied between the tip of the center pole 20a and the outer periphery of the
flange 20b, for example, the center pole 20a. The tip of the magnetic sensor is magnetized with
the S pole, and the outer periphery of the flange 20b with the N pole.
Further, since the flanged center pole 20 can be formed by injection molding, it can have an
arbitrary shape.
[0017]
In the present embodiment, as shown in FIG. 1, the upper surface of the flange 20b of the flanged
center pole 20 is magnetized in the opposite direction to the center pole 20a, for example, N pole
and S pole in the vertical direction. The ring-shaped magnet 22 which is magnetized is provided
around the center pole 20a.
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As the ring-shaped magnet 22, any material such as ferrite, plastic, neodymium magnet and the
like can be used.
[0018]
A ring-shaped plate 23 is provided on the upper surface of the ring-shaped magnet 22, and a
magnetic gap 4 is formed between the outer peripheral surface of the pole piece 21 and the
inner peripheral surface of the plate 23.
[0019]
Further, in this embodiment, as shown in FIG. 1, a bottomed cylindrical shield cover 24 is
provided which covers from the back surface of the flange 20b of the flanged center pole 20 to
the plate 23.
[0020]
Further, the frame 5 of the speaker is attached to the upper surface of the plate 23, and the outer
peripheral portion of the cone-shaped diaphragm 6 provided with the edge 7 on the outer
peripheral portion thereof is held by the gasket 8.
[0021]
On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
diaphragm 6, and a voice coil 10 is wound around the voice coil bobbin 9. The voice coil 10 is
mounted on the outer peripheral surface of the pole piece 21 and the inside of the plate 23. It is
inserted into the magnetic gap 4 formed between it and the circumferential surface.
[0022]
The voice coil 10 is held by the damper 11 in the magnetic gap 4.
As the damper 11, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
Further, a cap 14 for preventing dust intrusion is provided so as to cover the upper surface of the
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voice coil bobbin 9.
[0023]
Further, an acoustic signal from the input terminal 12 provided at a predetermined position of
the frame 5 is supplied to the voice coil 10 through the tinsel wire 13.
[0024]
The loudspeaker according to this embodiment is constructed as described above, and according
to this embodiment, the center pole 20a and the flange 20b are integrally formed of a plastic
magnet, and the ring-shaped magnet 22 is provided on the flange 20b. The magnetic flux from
the magnets 20a, 20b and 22 flows from the N pole of the ring magnet 22 → plate 23 →
magnetic gap 4 → pole piece 21 → center pole 20a → flange 20b → S pole of the ring magnet
22 and shield cover The same pole, eg, N pole, is in contact with 24. With a simple configuration
that does not require a cancellation magnet, it is possible to obtain a magnetically shielded
speaker and to obtain a small thin speaker by that amount. is there.
[0025]
Further, in the magnetic circuit of the speaker according to the present embodiment, since the
center pole 20a and the flange 20b are magnetized and the ring-shaped magnet 22 is provided,
the magnetic force is increased accordingly, and the speaker's lowest resonance frequency is
obtained. There is a benefit that the resonance sharpness Q can be reduced, and a small speaker
box can be used to easily expand the bass reproduction band.
[0026]
It goes without saying that the present invention is not limited to the above-described example
and that various other configurations can be adopted without departing from the scope of the
present invention.
[0027]
According to the speaker of the present invention, the center pole and the flange are integrally
formed of a plastic magnet and a ring magnet is provided on the flange, and the magnetic flux
from the magnet is a ring magnet → Magnetic shield-type speaker with a simple configuration
that does not require a cancel magnet because the same pole, eg, N pole, contacts the shield
cover by flowing from plate → magnetic air gap → pole piece → center pole → flange → ring
magnet There is an advantage that it is possible to obtain a small speaker thin by that amount.
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[0028]
Further, in the speaker magnetic circuit according to the present invention, since the center pole
and the flange are magnetized and the ring-shaped magnet is provided, the magnetic force is
increased accordingly, and the resonance sharpness at the speaker's lowest resonance frequency
is increased. There is a benefit that Q can be made smaller and the bass reproduction band can
be easily expanded using a small speaker box.
[0029]
Brief description of the drawings
[0030]
1 is a cross-sectional view showing an example of an embodiment of the speaker of the present
invention.
[0031]
2 is a perspective view showing an example of the main part of the present invention.
[0032]
3 is a cross-sectional view showing an example of a conventional speaker.
[0033]
4 is a cross-sectional view showing an example of a conventional speaker.
[0034]
Explanation of sign
[0035]
4. Magnetic gap, 5. Frame, 6. Vibrator, 9. Voice coil bobbin, 10. Voice coil, 20. Centered pole with
flange, 20a .. Center pole, 20b .. Flange, 21 .. .. Pole piece, 22 .. Ring magnet, 23 .. Plate, 24 ..
Shield cover
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