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JPH1155785

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH1155785
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus suitable for application to a small speaker apparatus.
[0002]
2. Description of the Related Art Conventionally, a dynamic speaker device as shown in FIG. 3 has
been proposed as a small-sized speaker device. Referring to FIG. 3, in FIG. 3, 1 is made of a
magnetic material and has a cylindrical center pole 1a embedded in a disk-like central portion,
and concentrically surrounds the center pole 1a. In the figure, a yoke is formed by integrating a
magnet guide 1b in which a step portion is formed into an integrated T-shape in cross section,
and the magnet guide 1b of this yoke 1 is fitted with an inner diameter and joined to form a ring.
The magnet 2 is magnetized in the upper surface of the magnet 2. The ring-shaped plate 3 is
provided on the upper surface of the magnet 2 by bonding with an adhesive or the like. A
magnetic circuit (a so-called external Circuit).
[0003]
In this case, a voice coil is formed by forming a concentric magnetic gap 4 between the center
pole 1 a of the yoke 1 and the inner periphery of the plate 3 and winding the diaphragm 5 in the
magnetic gap 4. I will arrange 6a. Further, a funnel-shaped frame 7 made of steel or the like is
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fixed on the plate 3. An edge 8 is provided on an outer peripheral portion of the frame 7, and the
outer peripheral portion of the conical diaphragm 5 is held by the edge 8.
[0004]
On the other hand, the upper end portion of the voice coil bobbin 6 is attached to the inner
peripheral portion of the diaphragm 5, the voice coil 6a wound around the voice coil bobbin 6 is
inserted into the magnetic gap 4, and the diaphragm is used to Make 5 vibrate. A corrugated
concentric damper 9 is bonded between the upper end of the outer periphery of the voice coil
bobbin 6 and the bottom of the frame 7 with an adhesive or the like, and the damper 9 holds the
voice coil 6a in the magnetic gap 4 To do.
[0005]
A lead wire is drawn out from the voice coil 6a and connected to a terminal 11 provided on the
frame 7 through the tinsel wire 10, and an audio signal obtained at the terminal 11 is supplied to
the voice coil 6a. Further, a dustproof cap 12 is provided on the upper surface of the voice coil
bobbin 6.
[0006]
SUMMARY OF THE INVENTION In such a small speaker apparatus as shown in FIG. 3, the
magnetic force for vibrating the voice coil 6a in the magnetic gap 4 with a relatively large
amount of leakage flux is the energy of the magnet 2. Since the magnet 2 can not be made large
in a small speaker with approximately 30%, the magnetic force of the magnetic gap 4 that
vibrates the voice coil 6a can not be increased, and the sensitivity can not be sufficiently
increased. In addition, there is a disadvantage that good sound quality can not be obtained.
[0007]
Then, it is possible to arrange the ring-shaped thin plate magnet 13 magnetized in the same
direction as the ring-shaped magnet 2 so as to surround the voice coil bobbin 6 on the bottom of
the frame 7 as shown in FIG. The leakage flux from the ring-shaped thin plate magnet 13 is large
and the magnetic force of the magnetic gap 4 is slightly large, so that the sensitivity can not be
sufficiently increased, and good sound quality can not be obtained.
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[0008]
In view of the foregoing, it is an object of the present invention to make it possible to increase
the magnetic force of a small-sized speaker device, and to improve the sensitivity of the speaker
and the sound quality.
[0009]
The speaker device of the present invention comprises a magnetic circuit comprising a yoke
having a center pole, a ring-shaped magnet, and a ring-shaped plate disposed on the ring-shaped
magnet, and a ring-shaped plate. In a speaker device in which a magnetic gap is formed between
a peripheral wall and a center pole of the yoke, and a voice coil for vibrating a diaphragm is held
in the magnetic gap, the ring magnet has the same direction on the center pole. And a thin
magnetic plate provided on the thin magnet.
[0010]
According to the present invention, the magnetic thin plate and the plate provided on the thin
magnet have the same polarity, and from this plate, the leakage flux is suppressed by the
magnetic flux from the magnetic thin plate, and from the plate to the center pole The magnetic
flux density flowing through the air gap is increased, the utilization efficiency of the energy of
the magnet is increased, and the magnetic force of the magnetic air gap is increased.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIG. 1, an
example of an embodiment of a loudspeaker system according to the invention will be described.
In FIG. 1, parts corresponding to FIG. 3 are given the same reference numerals.
[0012]
In FIG. 1, the yoke 1 is made of a magnetic material and has a cylindrical center pole 1a
embedded in a disk-like central portion, and a stepped portion is formed to surround the center
pole 1a concentrically. The magnet guide 1b is integrated into a cross-sectional reverse T-shape.
[0013]
An inner diameter is fitted and joined to the magnet guide 1b of the yoke 1 to provide a ring-
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shaped magnet 2 magnetized in the thickness direction, and the upper surface of the magnet 2 is
joined with an adhesive or the like to form a ring-shaped plate A magnetic circuit (so-called
external magnet type magnetic circuit) is formed by the yoke 1, the magnet 2 and the plate 3.
[0014]
For example, a neodymium plastic magnet is used as the magnet 2.
The neodymium plastic magnet is stronger in magnetism than the ferrite magnet and can be
easily formed into any shape.
[0015]
In this case, a voice coil is formed by forming a concentric magnetic gap 4 between the center
pole 1 a of the yoke 1 and the inner periphery of the plate 3 and winding the diaphragm 5 in the
magnetic gap 4. I will arrange 6a.
[0016]
In this example, a thin disk-shaped magnet 20 magnetized in the same direction as the ringshaped magnet 2 is fixed on the center pole 1a of the yoke 1 with an adhesive or the like, and on
the thin disk-shaped magnet 20. The disc-shaped magnetic thin plate 21 is fixed by an adhesive
or the like.
[0017]
In this case, the magnetic flux of the magnet 20 is concentrated on the magnetic thin plate 21
provided on the thin disk-shaped magnet 20, and the magnetic thin plate 21 and the plate 3 have
the same polarity, and the leakage flux from the plate 3 is The magnetic flux density flowing
through the magnetic gap 4 to the center pole 1a of the plate 3 is increased by the magnetic flux
from the magnetic thin plate 21 and the energy utilization efficiency of the magnet 2 is
increased. The magnetic force of the magnetic gap 4 is increased by 25% or more as compared
with the prior art.
[0018]
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Further, a funnel-shaped frame 7 made of steel or the like is fixed on the plate 3.
The outer peripheral portion of the conical diaphragm 5 with the edge 8 is adhered and fixed to
the flange portion of the outer periphery of the frame 7 through the gasket 14.
[0019]
On the other hand, the inner periphery of the diaphragm 5 is fixed to the upper end of the outer
periphery of the voice coil bobbin 6 with an adhesive or the like, and the voice coil 6a wound
around the lower end of the voice coil bobbin 6 is inserted into the magnetic gap 4. The
diaphragm 5 is vibrated by the voice coil 6a.
[0020]
A corrugated concentric damper 9 is bonded with an adhesive or the like between the lower side
of the fixed portion of the inner peripheral portion of the diaphragm 5 on the outer periphery of
the voice coil bobbin and the bottom outer peripheral portion of the frame 7. The voice coil 6a is
held in the magnetic gap 4.
[0021]
A lead wire is drawn from the voice coil 6a and connected to a terminal 11 provided on the
frame 7 through a tinsel wire 10, and an audio signal obtained at the terminal 11 is supplied to
the voice coil 6a.
Further, a dustproof cap 12 is provided on the upper surface of the voice coil bobbin 6.
[0022]
In this example, as described above, a thin disk-shaped magnet 20 magnetized in the same
direction as the ring-shaped magnet 2 is provided on the center pole 1a of the yoke 1, and the
magnet 20 is magnetized on the thin disk-shaped magnet 20. Since only the body thin plate 21 is
provided, the outer shape is not so large as compared with the prior art, and the magnetic flux of
the magnet 20 is concentrated on the magnetic thin plate 21 provided on the thin disk-shaped
magnet 20. And the plate 3 have the same polarity, and the leakage flux from the plate 3 is
suppressed by the magnetic flux from the magnetic thin plate 21, and the magnetic flux density
flowing to the center pole 1 a from the plate 3 via the magnetic gap 4 is The energy utilization
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efficiency of the magnet 2 is increased, and the magnetic force of the magnetic gap 4 can be
increased by as much as 25% or more as compared with the conventional case. Of the magnetic
force of the speaker device that can be increased, there is a benefit that can be improved and
quality improvements in the sensitivity of the speaker.
[0023]
FIG. 2 shows another example of the present invention.
In order to explain this FIG. 2 example, the same reference numerals are given to the parts
corresponding to FIG. 1 example, and the detailed explanation thereof will be omitted.
[0024]
In FIG. 2, reference numeral 22 denotes a cylindrical magnet magnetized in the vertical direction,
and a disc-like pole piece 23 is fixed on the cylindrical magnet 22 with an adhesive or the like.
Further, a yoke 24 having a plate portion 24a shaped to surround the columnar magnet 22 is
provided, and a magnetic circuit (internal magnetic type magnetic circuit) is formed by the
columnar magnet 22, the pole piece 23 and the yoke 24.
[0025]
In this case, a voice is formed by forming a concentric magnetic gap 4 between the pole piece 23
and the inner periphery of the plate portion 24 a of the yoke 24 and winding the diaphragm 5 in
the magnetic gap 4 around the voice coil bobbin 6. The coil 6a is arranged.
[0026]
In this embodiment, as shown in FIG. 2, a thin ring-shaped magnet 25 magnetized in the same
direction as the cylindrical magnet 22 is fixed on the inner side of the plate portion 24a of the
yoke 24 with an adhesive or the like. The ring-shaped magnetic thin plate 26 is fixed on the ringshaped magnet 25 with an adhesive or the like.
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[0027]
In this case, the magnetic flux of the ring-shaped magnet 25 is concentrated on the thin magnetic
plate 26 provided on the thin ring-shaped magnet 25, and the magnetic thin plate 26 and the
pole piece 23 have the same polarity. Leakage from the pole piece 23 The magnetic flux is
suppressed by the magnetic flux from the magnetic thin plate 26, and the magnetic flux density
flowing through the magnetic gap 4 to the plate portion 24a of the yoke 24 from the pole piece
23 increases, and the energy of the cylindrical magnet 22 The utilization efficiency of the
magnetic gap 4 is increased, and the magnetic force of the magnetic gap 4 is increased.
[0028]
Further, a funnel-shaped frame 7 made of steel or the like is fixed to the outer peripheral side of
the plate portion 24 a of the yoke 24.
Others are configured in the same manner as in FIG.
[0029]
It can be easily understood that the same function and effect as those in FIG. 1 can be obtained
also in this example in FIG.
[0030]
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.
[0031]
According to the present invention, the energy of the magnet can be efficiently used, and the
magnetic force in the magnetic gap can be increased without increasing the size of the outer
shape, so the sensitivity of the small speaker can be improved. And there is a benefit that can
improve the sound quality.
[0032]
Brief description of the drawings
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[0033]
1 is a cross-sectional view showing an example of the speaker apparatus of the present invention.
[0034]
2 is a cross-sectional view showing another example of the present invention.
[0035]
3 is a cross-sectional view showing an example of a conventional speaker device.
[0036]
4 is a cross-sectional view showing an example of a speaker device.
[0037]
Explanation of sign
[0038]
1, 24 .. Yoke, 1a ..: Center pole, 2 ... ring-shaped magnet, 3 ... plate, 4 ... magnetic gap, 5 ...
diaphragm, 6 ... voice coil bobbin, 6a .. voice coil, 7 ... Frames 8. Edges 9. Dampers 20 Thin disk
magnets 21, 26 Magnetic thin plates 22 Cylindrical magnets 23. Pole pieces 24a Plate portion ,
25 .. Thin ring magnet
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