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JP2000308189

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DESCRIPTION JP2000308189
[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. 12 and
FIG. 13 have been proposed as high frequency sound speakers capable of reproducing up to an
ultra high frequency range up to, for example, 100 kHz.
[0003]
Referring to the ribbon type speaker shown in FIGS. 12 and 13, reference numeral 1 denotes a
rectangular parallelepiped magnet, and a plate-like yoke 2a having a predetermined shape is
provided in contact with the N pole of the rectangular parallelepiped magnet 1 and the magnet 1
is provided. 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]
The one end of the rectangular plate 3a and the other end of the plate 3b are fixed to the upper
end face of the plate-like yokes 2a and 2b, respectively, and relatively wide between the other
end face of the plate 3a and one end face of the plate 3b. A magnetic gap 4 of a predetermined
length is formed.
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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. 12 and 13, 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. 12 and 13, the width of the
magnetic gap 4 required for the movement of the ribbon diaphragm 5 is very large, and this
magnetic gap 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]
The speaker according to the present invention comprises a U-shaped yoke having a
predetermined length, a center plate held by first and second magnets disposed between both
side walls of the U-shaped yoke, and First and second plates respectively disposed at the upper
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2
ends of both side walls of the U-shaped yoke and arranged to form elongated first and second
magnetic gaps respectively between the center plate and the respective inner surfaces; The voice
coil part inserted in the 1st and 2nd magnetic space ¦ gap, and the diaphragm part have a
diaphragm integrally formed.
[0011]
Thus, according to the present invention, since the voice coil portion of the thin plate diaphragm
is only inserted into the elongated first and second magnetic gaps, the widths of the first and
second magnetic gaps can be made extremely small. Even with a relatively small magnetic force
magnet, the magnetic force of the first and second magnetic gaps can be made very large.
[0012]
The speaker according to the present invention also includes a U-shaped yoke having a
predetermined length, a center plate sandwiched by first and second magnets disposed between
both side walls of the U-shaped yoke, and upper ends of both side walls of the U-shaped yoke
First and second plates respectively disposed to form elongated first and second magnetic gaps
between the center plate and the respective inner surfaces, and the first and second magnetic
gaps respectively. It has a diaphragm in which a short coil portion and a diaphragm portion
which are inserted into the inside are integrally formed, and a drive coil.
[0013]
According to the present invention, the width of the first and second magnetic gaps can be made
extremely small because only the short coil portion of the thin plate diaphragm is inserted into
the elongated first and second magnetic gaps. Even with a relatively small magnetic force
magnet, the magnetic force of the first and second magnetic gaps can be made very large.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the speaker according to the
present invention will be described below with reference to FIGS. 1, 2 and 3. FIG.
[0015]
In FIG. 1 and FIG. 2, reference numeral 10 denotes a U-shaped yoke having a predetermined
length, and a rectangular of a predetermined size held by two columnar magnets 11 and 12
between one and the other side walls 10a and 10b of the U-shaped yoke 10. The center plate 13
of
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[0016]
In this case, the N pole surface of the columnar magnet 11 is bonded and fixed to the inner
surface of one side wall 10a of the U-shaped yoke 10, and one side surface of the center plate 13
is bonded and fixed to the S pole surface of the columnar magnet 11. The S pole surface of the
columnar magnet 12 is adhered and fixed to the other side surface of the center plate 13, and the
N pole surface of the columnar magnet 12 is adhered and fixed to the inner surface of the other
side wall 10 b of the U-shaped yoke 10.
[0017]
One end of each of rectangular plates 14 and 15 is fixed to the upper end of one side wall 10a
and the other side wall 10b of the U-shaped yoke 10, respectively.
In this example, the plates 14 and 15 are formed integrally with one and the other side walls 10a
and 10b, respectively.
[0018]
In this case, an elongated magnetic gap 16 is formed by the other end surface of the plate 14 and
one side surface of the center plate 13, and an elongated magnetic gap 17 is formed by the other
end surface of the plate 15 and the other side surface of the center plate 13. Let it form.
[0019]
The voice coil portion 18 a of the elongated dome-shaped diaphragm 18 in which the voice coil
portion 18 a and the diaphragm portion 18 b are integrally formed is inserted into the elongated
magnetic gaps 16 and 17.
As this diaphragm 18, as shown in FIGS. 3A and 3B, a thin plate conductor, for example, an
elongated dome-like upper surface made of an aluminum thin plate and one side portion are
opened to make this one flat coil as one flat coil. A voice coil portion 18a is formed, and a thin
film made of, for example, a synthetic resin is adhered and fixed so as to cover the opening of the
elongated dome to form a diaphragm portion 18b. Terminals 19a and 19b are provided at both
ends of the flat coil of this one turn. An acoustic signal is supplied between 19a and 19b.
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[0020]
In this case, as shown in FIGS. 4A and 4B, the opening 18c of the elongated dome may be left
open, and the thin aluminum plate portion other than the voice coil portion 18a may be used as
the diaphragm portion 18b.
[0021]
For attaching the elongated dome-shaped diaphragm 18, as shown in FIG. 2, for example,
bonding of foam 20 such as polystyrene foam or a rubber-based adhesive between the upper end
face of the center plate 13 and the inner surface of the elongated dome-shaped diaphragm 18.
The magnetic fluid 21 having viscosity in the magnetic field in the elongated magnetic gaps 16
and 17 so as to adhere and fix through the material and hold the voice coil portion 18a of the
diaphragm 18 in the elongated magnetic gaps 16 and 17. To inject
[0022]
In this case, even if the diaphragm 18 is bonded and fixed via, for example, a foam 20 such as
expanded polystyrene or a rubber adhesive, the diaphragm 18 vibrates without any problem in
the high frequency band.
[0023]
Since the present embodiment is configured as described above, the magnetic circuit according
to the present embodiment has the magnetic flux from the N pole of the columnar magnet 11 as
shown in FIG. 10a → plate 14 → magnetic air gap 16 → center plate 13 → magnetic circuit of S
pole of the columnar magnet 11 and N pole of the columnar magnet 11 → one side wall 10a of
the U-shaped yoke 10 → bottom → other side wall 10b → plate 15 → magnetic gap 17 → center
plate 13 → flow through the magnetic circuit of the S pole of the columnar magnet 11
[0024]
The magnetic flux from the N pole of the columnar magnet 12 is the N pole of the columnar
magnet 12 → the other side wall 10b of the U-shaped yoke 10 → the plate 15 → the magnetic
gap 17 → the center plate 13 → the magnetic circuit of the S pole of the columnar magnet 12
The N pole of the columnar magnet 12 → the other side wall 10b of the U-shaped yoke 10 → the
bottom → one side wall 10a → the magnetic gap 16 → the center plate 13 → the magnetic
circuit of the S pole of the columnar magnet 12 flows.
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[0025]
Therefore, when an acoustic signal is supplied between the terminals 19a and 19b of the voice
coil portion 18a constituting a flat coil of one turn of the diaphragm 18, a current corresponding
to the acoustic signal flows through the voice coil portion 18a, The diaphragm 18 vibrates
according to the rule of the left hand, the diaphragm portion 18 b vibrates, and a high sound is
emitted.
[0026]
According to this example, since only the voice coil portion 18a of the diaphragm 18 which is an
aluminum thin plate, for example, is inserted into the elongated magnetic gaps 16 and 17, the
gap width of the magnetic gaps 16 and 17 can be made extremely small. Even with the columnar
magnets 11 and 12 of relatively small magnetic force, the magnetic force of the magnetic gaps
16 and 17 can be made very large, and an inexpensive speaker for high sound with high sound
quality can be obtained.
[0027]
As shown in FIGS. 1 and 2, in the dynamic high-pitched speaker using the voice coil portion 18a
of a flat coil of one turn, the impedance of the voice coil portion 18a is very small. When a
matching transformer is used, when the speaker for high sound and the main speaker are used in
combination, the voice coil of the speaker for high sound of this example is connected in series to
the voice coil of the main speaker. For example, this matching transformer can be omitted.
[0028]
5, 6 and 7 show other examples of the embodiment of the speaker according to the present
invention.
The parts corresponding to those in FIGS. 1 and 2 will be denoted by the same reference
numerals.
[0029]
Also in this example, a rectangular center plate 13 of a predetermined size sandwiched by two
columnar magnets 11 and 12 is provided between one side wall 10a and the other side wall 10b
of the U-shaped yoke 10.
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[0030]
In this case, the N pole surface of the columnar magnet 11 is bonded and fixed to the inner
surface of one side wall 10a of the U-shaped yoke 10, and one side surface of the center plate 13
is bonded and fixed to the S pole surface of the columnar magnet 11. The S pole surface of the
columnar magnet 12 is adhered and fixed to the other side surface of the center plate 13, and the
N pole surface of the columnar magnet 12 is adhered and fixed to the inner surface of the other
side wall 10 b of the U-shaped yoke 10.
[0031]
One end of each of rectangular plates 14 and 15 is fixed to the upper end of one side wall 10a
and the other side wall 10b of the U-shaped yoke 10, respectively.
In this example, the plates 14 and 15 are formed integrally with one and the other side walls 10a
and 10b, respectively.
[0032]
In this case, the elongated magnetic gap 16 is formed by the other end surface of the plate 14
and one side surface of the center plate 13, and the elongated magnetic gap 17 is formed by the
other end surface of the plate 15 and the other side surface of the center plate 13. To form
[0033]
As shown in FIGS. 7A and 7B in the elongated magnetic gaps 16 and 17, the short coil portion
25a of the diaphragm 25 in which the short coil portion 25a and the diaphragm portion 25b are
integrally formed of a conductive thin plate such as an aluminum thin plate As shown in FIG. 5
and FIG.
[0034]
As this diaphragm 25, as shown to FIG. 7A and 7B, it is set as the elongate dome shape which
consists of a conductor thin plate, for example, aluminum thin plate, The foot part of this
elongate dome shape is made into the short coil part 25a, The upper part of this elongate dome
shape is vibrated. It is set as the board part 25b.
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[0035]
As this diaphragm 25, as shown in FIG. 8, a thin film made of, for example, a synthetic resin is
adhered and fixed so as to cover the upper part of a long elliptical short coil portion 25a of a
predetermined width by a conductive thin plate such as an aluminum thin plate. You may use
25b.
[0036]
Further, in the present embodiment, the drive coil 26 is wound along the inner surfaces of the
magnetic gaps 16 and 17 of the plates 14 and 15 and fixed by bonding.
As a lead of the drive coil 26, one made of a magnetic material is used to facilitate the passage of
magnetic flux.
In the present embodiment, an acoustic signal is supplied to the drive coil 26.
[0037]
Further, in this case, the drive coil 26 may be wound and fixed along the outer periphery of the
center plate 13 in the magnetic gaps 16 and 17 as shown in FIG.
[0038]
To attach the elongated dome-shaped diaphragm 25, as shown in FIG. 6, for example, a foam 20
such as expanded polystyrene or a rubber-based adhesive is bonded between the upper end
surface of the center plate 13 and the inner surface of the elongated dome-shaped diaphragm 25.
In order to bond and fix through the material and to hold the short coil portion 25a of the
diaphragm 25 in the elongated magnetic gaps 16 and 17, the magnetic fluid 21 having viscosity
in the magnetic field in the elongated magnetic gaps 16 and 17 is used. To inject
[0039]
In this case, even if the diaphragm 25 is bonded and fixed via, for example, a foam 20 such as
expanded polystyrene or a rubber-based adhesive, the diaphragm 25 vibrates without any
trouble in the high region.
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[0040]
Since the present embodiment is configured as described above, the magnetic circuit according
to the present embodiment has the magnetic flux from the N pole of the columnar magnet 11 as
shown in FIG. 10a → plate 14 → magnetic air gap 16 → center plate 13 → magnetic circuit of S
pole of the columnar magnet 11 and N pole of the columnar magnet 11 → one side wall 10a of
the U-shaped yoke 10 → bottom → other side wall 10b → plate 15 → magnetic gap 17 → center
plate 13 → flow through the magnetic circuit of the S pole of the columnar magnet 11
[0041]
Further, the magnetic flux from the N pole of the columnar magnet 12 is the N pole of the
columnar magnet 12 → the other side wall 10b of the U-shaped yoke 10 → plate 15 → magnetic
gap 17 → center plate 13 → S pole of the columnar magnet 12 The magnetic circuit of the pole
magnet 12 → the other side wall 10b of the U-shaped yoke 10 → the bottom → one side wall
10a → the magnetic gap 16 → the center plate 13 → the magnetic circuit of the S pole of the
column magnet 12 flows.
[0042]
Therefore, when an acoustic signal is supplied to the drive coil 26, the short coil portion 25a, that
is, the diaphragm 25 vibrates according to the acoustic signal by electromagnetic induction, and
high sound can be emitted.
[0043]
According to this example, since only the short coil portion 25a of the diaphragm 25 which is an
aluminum thin plate, for example, is inserted into the elongated magnetic gaps 16 and 17, the
gap width of the magnetic gaps 16 and 17 can be made extremely small. Even with the columnar
magnets 11 and 12 of relatively small magnetic force, the magnetic force of the magnetic gaps
16 and 17 can be made very large, and a low cost, high sound quality speaker for high sound can
be obtained.
[0044]
As shown in FIGS. 5 and 6, in the electromagnetic induction type high-pitched speaker, the
impedance of the drive coil 26 is relatively large, and thus no matching transformer is required.
[0045]
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9
10 and 11 show another example of the embodiment of the present invention.
The parts corresponding to FIGS. 5 and 6 will be denoted by the same reference numerals and
the detailed description will be omitted.
[0046]
In the example of FIGS. 10 and 11, in the example of FIGS. 5 and 6, the drive coil 26 for
supplying an acoustic signal is wound and fixed along the outer peripheral surface of the plates
14 and 15.
In this case, since the drive coil 26 is outside the magnetic air gaps 16 and 17, the conductive
wire constituting the drive coil 26 may be a normal one.
The examples of FIGS. 10 and 11 are otherwise configured in the same manner as the examples
of FIGS. 5 and 6.
[0047]
It can be easily understood that the same effects as those of the examples of FIGS. 5 and 6 can be
obtained in the examples of FIGS. 10 and 11 as well.
Furthermore, since the drive coils 26 are wound along the outer peripheral surface of the plates
14 and 15 in this example of FIGS. 10 and 11, there is an advantage that manufacture is
relatively easy.
[0048]
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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[0049]
According to the present invention, since only the voice coil portion of the diaphragm, which is,
for example, an aluminum thin plate, is inserted into the elongated magnetic gap, the gap width
of the magnetic gap can be made extremely small, and a relatively small magnetic Even with a
force magnet, the magnetic force of this magnetic gap can be made extremely large, and a cheap,
high-quality speaker for high sound can be obtained.
[0050]
Further, according to the present invention, since only the short coil portion of the diaphragm,
which is, for example, an aluminum thin plate, is inserted into the elongated magnetic gap, the
gap width of this magnetic gap can be made extremely small and a relatively small magnetic
force magnet Even in this case, the magnetic force of the magnetic gap can be made very large,
and a low-cost, high-sound quality speaker for high sound can be obtained.
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