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DESCRIPTION JP2000059886

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DESCRIPTION JP2000059886
[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, a small speaker as shown in FIG. 4 has been
proposed. This speaker is, as shown in FIG. 4, 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]
On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
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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. 4, 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. 4, 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. 5 has been proposed as a speaker for
eliminating such a leakage flux.
The parts corresponding to those in FIG. 4 will be assigned the same reference numerals as those
in FIG. In FIG. 5, a ring-shaped cancel magnet 15 magnetized in the direction opposite to the
main drive magnet 1 is attached in the vicinity of the lower surface outer periphery of the flange
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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 in the same
manner as in FIG.
[0009]
However, in the case of a small speaker as shown in FIGS. 4 and 5, the cross section of the center
pole 3a made of a magnetic material constituting the magnetic circuit is small, and there is a
magnetic saturation phenomenon. In addition, magnetic leakage occurs in the magnetic gap 4
and the magnetic force of the magnetic gap 4 of the magnetic circuit can not be sufficiently
increased, so that the low frequency characteristic and the sound quality can not be improved.
[0010]
[0010] In view of the foregoing, it is an object of the present invention to improve the low
frequency characteristics and sound quality of a small speaker by increasing the magnetic force
of the magnetic gap.
[0011]
SUMMARY OF THE INVENTION In the speaker according to the present invention, the center
pole portion, the flange portion, and the ring-like magnet portion surrounding the center pole
portion are integrally formed of a plastic magnet, and the upper end side of the center pole
portion is one The upper end side of the ring-shaped magnet portion is magnetized to be the
other magnetic pole, and a pole piece is provided on the upper end side of the center pole
portion, and a plate is provided on the upper end side of the ring-shaped magnet portion. A disclike ring magnet magnetized in the same direction as the center pole portion is provided on the
plate, and a magnetic circuit having a magnetic gap formed between the pole piece and the plate
is provided, and the lower end side of the flange portion On the lower end side of the cancel
magnet and the disc It is provided with a shield cover for covering between one magnetic pole of
the upper surface of the grayed magnet.
[0012]
According to the present invention, the center pole portion, the flange portion, and the ringshaped magnet portion surrounding the center pole portion are integrally formed of a plastic
magnet, and the upper end side of the center pole portion is used as one magnetic pole. The
upper end side of the ring-shaped magnet portion is the other magnetic pole, the pole piece is
fixed to the upper end side of this center pole portion, the plate is fixed to the upper end side of
this ring-shaped magnet portion, and this pole piece and the plate Since the magnetic gap is
formed, the magnetic force of the magnetic gap becomes strong, and a disc-like ring magnet
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magnetized in the same direction as the center pole portion is provided on the plate and the
magnetic shield is provided. In addition to reducing the magnetic leakage of the magnetic gap, a
magnetic force from the disc-like ring magnet is further added, Magnetic force air gap becomes
stronger, it is possible to improve the low frequency characteristics and sound quality of the
loudspeaker.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of a speaker
according to the present invention will be described below with reference to FIG.
1 will be described with reference to FIG. 1 and portions corresponding to those in FIGS. 4 and 5
are denoted by the same reference numerals.
[0014]
In this embodiment, as shown in FIG. 2, the center pole portion 20a, the flange portion 20b, and
the ring-shaped magnet portion 20c surrounding the center pole portion 20a are integrally
molded by a plastic magnet.
The plastic magnet is composed of an isotropic plastic magnet, and in this example, a magnetic
field is applied between the upper end side of the center pole portion 20a and the upper end side
of the ring-shaped magnet portion 20c, for example, the center pole portion 20a. The upper end
side of the ring magnet 20 is magnetized with the N pole, and the upper end side of the ringshaped magnet portion 20c is magnetized with the S pole.
Further, since the center pole portion 20a, the flange portion 20b, and the ring-shaped magnet
portion 20c surrounding the center pole portion 20a can be formed by injection molding, any
shape can be used.
[0015]
Further, in this embodiment, as shown in FIG. 1, a disk-shaped pole piece 21 is bonded and fixed
onto the upper end side of the center pole portion 20a made of this plastic magnet, and a ring
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shaped magnet portion 20c made of this plastic magnet. The ring-shaped plate 22 is adhesively
fixed on the upper end side of the magnetic disk, and the magnetic gap 4 is formed between the
outer peripheral surface of the pole piece 21 and the inner peripheral surface of the plate 22.
[0016]
In this embodiment, for example, a disk-shaped ring magnet 23 magnetized in the same direction
as the center pole portion 20a on the ring-shaped plate 22 is, for example, an N pole on the
upper surface and a S pole on the lower surface. At the same time as bonding and fixing, the
inner periphery of a frame 5 made of steel, for example, of a speaker is fixedly mounted on the
upper surface of the plate-like ring magnet 23.
[0017]
In the present embodiment, a cancel magnet is provided with a central hole on the lower end side
of the flange portion 20b made of a plastic magnet, for example, an S pole on the upper surface
and an N pole on the lower surface opposite to the center pole portion 20a. A bottomed
cylindrical shield cover 16 is provided to cover the gap between, for example, the N pole on the
lower end side of the cancel magnet 15 and the N pole on the upper surface of the circular ring
magnet 23.
In the example shown in FIG. 1, the opening of the bottomed cylindrical shield cover 16 is joined
and fixed to the outer peripheral surface of the frame 5.
[0018]
Further, the outer peripheral portion of the cone-shaped diaphragm 6 having the edge 7
provided on the outer peripheral portion of the frame 5 attached to the upper surface of the disklike ring magnet 23 is held by the gasket 8.
[0019]
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 22. It is
inserted into the magnetic gap 4 formed between it and the circumferential surface.
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[0020]
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
voice coil bobbin 9.
[0021]
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.
[0022]
The loudspeaker according to this embodiment is constructed as described above, and according
to this embodiment, the center pole portion 20a, the flange portion 20b, and the ring-shaped
magnet portion 20c surrounding the center pole portion 20a are integrally molded by a plastic
magnet. The magnetic flux from the magnet 20a, 20b, 20c is the N pole of the center pole
portion 20a → pole piece 21 → magnetic air gap 4 → plate 22 → ring shaped magnet portion
20c → flange portion 20b → center pole portion 20a and the center The magnetic fluxes of the
pole portion 20a, the ring-shaped magnet portion 20c and the flange portion 20b are added and
flow, and the magnetic force of the magnetic gap 4 becomes strong.
[0023]
Further, since the plate-like ring magnet 23 whose upper surface is N pole and whose lower
surface is S pole is provided on the plate 22, the magnetic flux from the N pole of the plate-like
ring magnet 23 is N of the plate-like ring magnet 23. Pole → frame 5 → plate 22 → flow with the
S pole of the ring-shaped ring magnet 23 to prevent leakage of the magnetic flux of the magnetic
gap 4 and a part of the magnetic flux of the magnetic gap 4 is additionally added. The power of
[0024]
Further, since the shield cover 16 covers from the N pole on the lower end side of the cancel
magnet 15 to the N pole on the upper surface of the disc-like ring magnet 23, a good magnetic
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shield is provided to reduce the leakage flux. Can.
[0025]
According to this embodiment, since the magnetic force of the magnetic gap 4 can be maximized,
the low frequency characteristic and the sound quality of the small speaker can be improved, and
the resonance sharpness at the lowest resonance frequency of the speaker can be improved.
There is a benefit that Q can be reduced and the bass reproduction band can be easily expanded
using a small speaker box.
[0026]
FIG. 3 shows another example of the embodiment of the present invention.
In order to explain this FIG. 3 example, the same reference numerals are given to the parts
corresponding to the FIG. 1 example, and the detailed explanation thereof will be omitted.
[0027]
In the example of FIG. 3, the opening of the bottomed cylindrical shield cover 16 in the example
of FIG. 1 is joined and fixed to the outer surface of the frame 5 of the speaker.
Others are configured in the same manner as in FIG.
[0028]
It will be easily understood that in the example of FIG. 3 as well, the same effect as that of the
example of FIG. 1 can be obtained.
[0029]
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.
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[0030]
According to the present invention, the magnetic force of the magnetic gap can be increased, and
the low frequency characteristic and the sound quality of the small speaker can be improved, and
at the lowest resonance frequency of the speaker. There is a benefit that the resonance sharpness
Q can be reduced and the bass reproduction band can be easily expanded using a small speaker
box.
[0031]
Brief description of the drawings
[0032]
1 is a cross-sectional view showing an example of an embodiment of the speaker of the present
invention.
[0033]
2 is a perspective view showing an example of the main part of FIG.
[0034]
3 is a cross-sectional view showing another example of the embodiment of the present invention.
[0035]
4 is a cross-sectional view showing an example of a conventional speaker.
[0036]
5 is a cross-sectional view showing an example of a conventional speaker.
[0037]
Explanation of sign
[0038]
4. Magnetic gap, 5. Frame, 6. Vibration plate 9. Voice coil bobbin 10. Voice coil 15. Cancel
magnet 16. Shield cover 20a Center pole portion 20b. .. Flange part, 20c .. ring magnet part, 21 ..
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pole piece, 22 .. plate, 23 ..
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