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JP2000350284

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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
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DESCRIPTION JP2000350284
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
high-tone speaker capable of reproducing up to, for example, a very high frequency range up to
100 kHz.
[0002]
2. Description of the Related Art Conventionally, ribbon type speakers as shown in FIG. 9 and FIG.
10 have been proposed as speakers for high sound which can be reproduced up to a super high
frequency band up to, for example, 100 kHz.
[0003]
Referring to FIG. 9 and FIG. 10, the ribbon-shaped speaker 1 has a rectangular parallelepiped
magnet, and a plate-like yoke 2a of a predetermined shape is provided in contact with the N pole
of the rectangular parallelepiped magnet 1 to provide the magnet 1 A plate-like yoke 2b having
the same shape as the plate-like yoke 2a is provided in contact with the S pole of
[0004]
One end of each of rectangular plates 3a and 3b is fixed to the upper end face of each of platelike yokes 2a and 2b, and a magnetic gap of a relatively wide predetermined length is formed
between the other end faces of each of plates 3a and 3b. Make four.
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1
[0005]
A ribbon-shaped diaphragm 5 made of a conductive material such as an aluminum thin plate is
inserted into the magnetic gap 4, and one end of the ribbon-shaped diaphragm 5 is insulated and
held by the holding member 6a at one end of the magnetic gap 4. The other end of the ribbonshaped diaphragm 5 is insulated and held by the holding member 6b on the other end side of the
magnetic gap 4 and connected to the other input terminal 7b.
[0006]
Also, the acoustic signal supplied to the acoustic signal input terminals 8a and 8b is supplied to
one and the other input terminals 7a and 7b through a transformer (matching transformer) 9 for
impedance conversion.
[0007]
In the ribbon speaker as shown in FIGS. 9 and 10, when current flows through the ribbon
diaphragm 5 in response to an acoustic signal supplied between one and the other input
terminals 7a and 7b, the left hand of the framing The diaphragm 5 vibrates to emit high noise
according to the following rule.
[0008]
However, in the case of ribbon type speakers as shown in FIGS. 9 and 10, the width of the
magnetic gap 4 required for the movement of the ribbon-shaped diaphragm 5 is very large. In
order to generate a large magnetic force, the magnet 1 having a very large magnetic force is
required to generate a large magnetic force, and the magnet 1 having a very large magnetic force
is disadvantageously difficult to manufacture and expensive. The
[0009]
SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention
to propose a speaker for high-pitched sound that enables the magnetic force of the magnetic gap
to be increased even with a magnet having a relatively small magnetic force.
[0010]
SUMMARY OF THE INVENTION A speaker according to the present invention comprises a
magnet, first and second flat yokes disposed in contact with the N pole and the S pole of the
magnet, and the first and second flat yokes. First and second plates fixed to their respective
upper end faces of the flat plate yoke and having an elongated magnetic gap formed between
their respective other end faces, and the first and second end sides thereof respectively. The first
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2
and second diaphragms are provided with planar voice coils fixed on the plate and inserted into
the magnetic gap at the other end.
[0011]
According to the present invention, since only the flat voice coil provided on the diaphragm is
inserted into the elongated magnetic gap, the gap width of the magnetic gap can be made
extremely small and the magnet of relatively small magnetic force can be obtained. Also, the
magnetic force of this magnetic gap can be made very large.
Further, according to the present invention, since the first and second diaphragms are provided,
the sound radiation area can be increased.
[0012]
Further, according to the speaker of the present invention, a magnet, first and second flat yokes
disposed respectively in contact with the N pole and the S pole of the magnet, and upper end
surfaces of the first and second flat yokes, respectively. A first plate and a second plate arranged
so as to fix one end to each other and to form an elongated magnetic gap between the other end
faces, and fix one end side on the first and second plates respectively and A first and a second
diaphragm provided with a shorting conductor to be inserted into the magnetic gap at the end
side, and a drive coil provided along the inner surface of the first and the second plate is there.
[0013]
According to the present invention, since only the shorting conductor and the drive coil provided
on the diaphragm are inserted into the elongated magnetic gap, the gap width of the magnetic
gap can be made extremely small, and a relatively small magnetic force can be obtained. Even
with a magnet, the magnetic force of this magnetic gap can be made extremely large.
Further, according to the present invention, since the first and second diaphragms are provided,
the sound radiation area can be increased.
[0014]
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3
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIG. 1, FIG. 2
and FIG. 3, an example of an embodiment of the loudspeaker according to the invention will be
described.
[0015]
In FIG. 1 and FIG. 3, reference numeral 10 denotes a ring-shaped magnet of a predetermined
thickness made of, for example, a ferrite magnet, and a plate-like yoke 11a of a predetermined
rectangular shape is provided in contact with the N pole face of the ring-shaped magnet 10.
Further, a plate-like yoke 11b having the same shape as the plate-like yoke 11a is provided in
contact with the S pole surface of the magnet 10.
[0016]
One end side of each short side of the rectangular plates 12a and 12b is fixed to the upper end
face of each of the plate-like yokes 11a and 11b, and an elongated magnet is formed between the
other end faces of each short side of the plates 12a and 12b. The air gap 13 is formed.
[0017]
In this case, the gap width of the elongated magnetic gap 13 is made extremely thin by inserting
flat voice coils 15 and 31 made of, for example, aluminum thin plate integrally provided with two
diaphragms 14 and 30 described later.
At this time, the magnetic force of the magnetic gap 13 can be made extremely large even if the
magnetic force of the magnet 10 is relatively small.
[0018]
In this example, the bonding portions 14a and 30a of one side of the two rectangular diaphragms
14 and 30 are adhesively fixed on the plates 12a and 12b via the gaskets 16a and 16b.
The two diaphragms 14 and 30 are respectively dome-shaped, and planar one-turn voice coils 15
and 31 are provided on the other side opposite to the bonding portions 14a and 30a,
respectively. And 31 are inserted into the magnetic gap 13.
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4
[0019]
For example, as shown in FIG. 2A, this vibrating plate 14 has a bonding portion 14a on one side
of a rectangle made of a synthetic resin adhered and fixed to the gasket 16a in a straight line
shape, and this vibrating plate 14 has a dome shape. A flat one-turn voice coil 15 is provided on
the other side opposite to the above.
Further, as shown in FIG. 2B, the diaphragm 30 is formed symmetrically with the diaphragm 14,
and the bonding portion 30a on one side of a rectangular made of synthetic resin is adhered and
fixed to the gasket 16b in a straight line. The plate 30 has a dome shape, and a flat one-turn
voice coil 31 is provided on the other side opposite to the bonding portion 30a.
In this embodiment, the planar voice coils 15 and 31 of the two diaphragms 14 and 30 are
attached to each other as shown in FIG. 2B and inserted into the magnetic gap 13.
[0020]
In this case, when the diaphragms 14 and 30 are formed of a synthetic resin, it is possible to
integrally form the aluminum thin plate forming the flat one-turn voice coil 15 and 31 by an
aluminum insert.
Input terminals 17a and 17b and 17c and 17d are provided at both ends of the voice coils 15
and 30, respectively, and acoustic signals are supplied to the input terminals 17a and 17b and
17c and 17d, respectively.
[0021]
In order to keep the flat one-turn voice coils 15 and 31 integrally provided on the diaphragms 14
and 30 in the elongated magnetic gap 13, a magnetic fluid having viscosity in the magnetic field
in the magnetic gap 13. Make 18 injections.
[0022]
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5
Since this embodiment is configured as described above, the magnetic flux from the N pole of the
magnet 10 according to this embodiment is N pole → plate yoke 11 a → plate 12 a → magnetic
gap 13 → plate 12 b → plate yoke 11 b → It flows through the magnetic circuit of the S pole of
the magnet 10.
[0023]
Therefore, when an acoustic signal is supplied between the input terminals 17a and 17b and 17c
and 17d of the planar voice coils 15 and 31 of one turn of the diaphragms 14 and 30,
respectively, the planar voice coils 15 and 31 and A current corresponding to this acoustic signal
flows, and the diaphragms 14 and 30 vibrate according to the left-hand rule of framing to emit a
high sound.
[0024]
According to this example, since only one turn flat voice coils 15 and 31 made of, for example,
aluminum thin plate are inserted into the elongated magnetic gap 13, the gap width of the
magnetic gap 13 can be made extremely small, which is inexpensive Even with the magnet 10
having a relatively small magnetic force, the magnetic force of the magnetic gap 13 can be made
very large, and an inexpensive high-sound speaker for high sound can be obtained.
[0025]
Further, in the present embodiment, since two diaphragms 14 and 30 are used, the area for
emitting sound is increased, and the sound pressure level can be raised.
[0026]
As shown in FIG. 1, in the dynamic high-pitched speaker using planar voice coils 15 and 31 of
one turn, the impedance of the voice coils 15 and 31 is very small. When used in combination
with the high-tone speaker 50 and the main speaker 51 as shown in FIG. 7, the high-tone speaker
50 of this embodiment is connected in series to the voice coil of the main speaker 51 as shown in
FIG. If the voice coil 15 (31) is connected, this matching transformer can be omitted.
[0027]
That is, as shown in FIG. 5, the acoustic signal 20 is supplied to the voice coil 15 (31) of the
speaker 50 of this embodiment through the parallel circuit of the voice coil 21 of the entire area
speaker 51 and the capacitor 22 for high pass. .
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[0028]
In FIG. 7, 52 is a speaker box, 53 is a baffle plate, 54 is a duct, 54a is a duct opening, 55a to 55d
are input terminals, and 56a to 56d are connection lines.
[0029]
FIGS. 4, 5 and 6 show other examples of the embodiment of the speaker according to the present
invention.
4 to 6, parts corresponding to FIG. 1 are given the same reference numerals.
[0030]
Also in this example, a plate-like yoke 11a of a predetermined rectangular shape is provided in
contact with the N-pole surface of a ring-shaped magnet 10 of a predetermined thickness made
of ferrite magnet, for example. A plate-like yoke 11b having the same shape as the plate-like yoke
11a is provided.
[0031]
One end of the short side of each of the rectangular plates 12a and 12b is fixed to the upper end
face of each of the plate-like yokes 11a and 11b, and an elongated magnetic gap 13 is formed
between the other end faces of the plates 12a and 12b. Form.
[0032]
In this case, the gap width of the elongated magnetic gap 13 is thin for inserting shorting
conductor portions 25a and 35a made of, for example, aluminum thin plates integrally provided
with two diaphragms 25 and 35 described later.
At this time, the magnetic force of the magnetic gap 13 can be made extremely large even if the
magnetic force of the magnet 10 is relatively small.
[0033]
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7
In this embodiment, bonded portions 25b and 35b of one side of rectangular diaphragms 25 and
35 made of a conductive thin plate, for example, an aluminum thin plate, are adhesively fixed on
plates 12a and 12b via gaskets 26a and 26b, respectively.
[0034]
For example, the diaphragms 25 and 35 made of aluminum thin plate are respectively made into
a dome shape, and the shorting conductor portions 25a and 35a at the other end opposite to the
bonding portions 25b and 35b are inserted into the magnetic gap 13 To do.
[0035]
For example, as shown in FIG. 5A, this diaphragm 25 adheres and fixes the bonding portion 25b
on one side of a rectangular aluminum thin plate to the gasket 26a in a straight line shape and
makes the diaphragm 25 dome-shaped. The end on the other side opposite to the other side is
used as the shorting conductor portion 25a.
Further, as shown in FIG. 5B, the diaphragm 35 is formed symmetrically with the diaphragm 25.
The bonding portion 35b of one side of the rectangular aluminum thin plate is adhered and fixed
to the gasket 26b in a straight line. The plate 35 is formed in a dome shape, and the end on the
other side opposite to the bonding portion 35b is used as the shorting conductor portion 35a.
Further, in this embodiment, the short-circuiting conductor portions 25a and 35a of the two
diaphragms 25 and 35 are bonded to each other as shown in FIG. 5B and inserted into the
magnetic gap 13.
[0036]
In this example, the elongated openings 25c and 35c are formed so as to remove an elongated
portion along the other side which is an unnecessary portion for ultra high frequency
reproduction of the diaphragms 25 and 35 above the shorting conductor portions 25a and 35a.
Provide
A thin film of synthetic resin may be provided in the elongated openings 25c and 35c.
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8
In this case, a short current flows along the outer periphery of the elongated openings 25c and
35c.
[0037]
Further, in the present embodiment, the drive coil 27 is wound along the inner surfaces of the
magnetic gaps 13 of the plates 12a and 12b, and is adhered and fixed.
As the electric wire of the drive coil 27, one made of a magnetic material can be used to facilitate
the passage of the magnetic flux.
In the present embodiment, an acoustic signal is supplied to the drive coil 27.
[0038]
In order to hold the shorting conductor portions 25a and 35a on the other side of the
diaphragms 25 and 35 in the elongated magnetic gap 13, the magnetic fluid 18 having viscosity
in the magnetic field is injected into the magnetic gap 13. It does like that.
[0039]
Since this embodiment is configured as described above, the magnetic flux from the N pole of the
magnet 10 according to this embodiment is N pole → plate yoke 11 a → plate 12 a → magnetic
gap 13 → plate 12 b → plate yoke 11 b → It flows through the magnetic circuit of the S pole of
the magnet 10.
[0040]
Therefore, when an acoustic signal is supplied to the drive coil 27, a short circuit current
corresponding to the acoustic signal flows through the openings 25c and 35c to the shorting
conductor portions 25a and 35a by electromagnetic induction, thereby the diaphragm 25 And
35 vibrate in response to this acoustic signal, and can emit high sound.
[0041]
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9
Thus, according to the present example, the elongated magnetic air gap (in this case, the drive
coil 27 is also a magnetic body, and therefore forms a part of the plate).
Since the shorting conductor portions 25a and 35a of the diaphragms 25 and 35, which are, for
example, aluminum thin plates, are inserted in 13), the gap width of the magnetic gap 13 can be
made very small, and the inexpensive relatively small magnetic force Even in the case of the
magnet 10, the magnetic force of the magnetic gap 13 can be made very large, and a low-cost,
high-sound quality speaker for high sound can be obtained.
[0042]
Further, in the present embodiment, since two diaphragms 25 and 35 are used, the area for
emitting sound becomes large, and the sound pressure level can be raised.
[0043]
As shown in FIGS. 4 to 6, in the electromagnetic induction type high sound speaker, since the
impedance of the drive coil 27 is relatively large, no matching transformer is required.
[0044]
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.
[0045]
According to the present invention, the gap width of the magnetic gap can be made extremely
small, and the magnetic force of this magnetic gap can be made extremely large even by using an
inexpensive relatively small magnetic force magnet. Thus, it is possible to obtain a high sound
quality speaker that is inexpensive and has high sound quality.
[0046]
Further, according to the present invention, since the first and second diaphragms are provided,
the area of sound radiation can be increased.
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10
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