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JP2000354295

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DESCRIPTION JP2000354295
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
high-tone speaker capable of reproducing, for example, an ultra high frequency band up to 100
kHz.
[0002]
2. Description of the Related Art Conventionally, ribbon type speakers as shown in FIGS. 9 and
10 have been proposed as high-tone speakers capable of reproducing up to, for example, an ultra
high frequency range up to 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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[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 can be vibrated to emit highpitched sound according to the following rule.
[0008]
However, in the case of a ribbon speaker as shown in FIGS. 9 and 10, a very large magnetic force
is required to generate a large magnetic force in the magnetic gap 4 necessary for the movement
of the ribbon diaphragm 5. The magnet 1 is required, and the magnet 1 having a very large
magnetic force is difficult to manufacture and expensive.
[0009]
In addition, a voice coil bobbin is attached to the inner periphery of a diaphragm made of one
commonly used cone paper, and a voice coil is wound around this voice coil bobbin, and the
voice coil is inserted into the magnetic gap. For example, it is very difficult to reproduce (radiate)
the superhigh range even in a 39 mm aperture full band speaker, and even in this speaker,
reproduction up to 40 kHz is at best due to the large mass of the voice coil etc. The
[0010]
SUMMARY OF THE INVENTION In view of the foregoing, the present invention proposes a
speaker capable of reproducing even a super-high frequency range even with a magnet of
relatively small magnetic force.
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[0011]
In the speaker of the present invention, a voice coil is attached to a diaphragm and a voice coil is
wound around the voice coil bobbin, and the voice coil is interposed between the inner
circumferential surface of the plate and the outer circumferential surface of the center pole. In
the speaker inserted into the magnetic gap formed in the above, the inner circumference of this
plate is made an acute angle and this voice coil bobbin is formed of a conductive material, and
the voice coil is bonded and fixed to this voice coil bobbin with a soft adhesive. In the super high
frequency range, the voice coil operates as a drive coil and the voice coil bobbin operates as a
short coil.
[0012]
According to the present invention, since the inner periphery of the plate forming the magnetic
gap is made acute, in this magnetic gap, the magnetic flux is concentrated at the acute angle
portion, and the magnetic force of the magnetic gap is increased. According to the invention,
since the voice coil is fixed to the voice coil bobbin by the soft adhesive, the adhesion by the soft
adhesive is reduced in the super high frequency range, and the voice coil bobbin and the voice
coil are separated. In this state, the voice coil operates as a drive coil and the voice coil bobbin
made of a conductive material forms an electromagnetic dielectric speaker operating as a short
coil, and the diaphragm is driven by the vibration of the very light voice coil bobbin. For example,
it is possible to reproduce to the super high frequency range up to 100 kHz.
[0013]
In the speaker according to the present invention, the voice coil bobbin is attached to the
diaphragm, and the voice coil bobbin is inserted into the magnetic gap formed between the inner
peripheral surface of the plate and the outer peripheral surface of the center pole. The voice coil
bobbin is made of a conductive material, and the slit extending in the longitudinal direction is
provided on the voice coil bobbin to form a one-turn voice coil. The one-turn voice coil made of
the voice coil bobbin is high-passed. It is intended to supply a signal.
[0014]
According to the present invention, since the inner periphery of the plate forming the magnetic
gap is made an acute angle, in this magnetic gap, the magnetic flux is concentrated at this acute
angle portion, and the magnetic force of the magnetic gap increases and the voice Since the coil
bobbin acts as a one-turn voice coil, the diaphragm is vibrated by the one-turn voice coil formed
of a very light-weight voice coil bobbin in the ultra high frequency range, for example, an ultra
high up to 100 kHz. It will be possible to play up to the range.
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[0015]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the loudspeaker
according to the invention will now be described with reference to FIGS. 1 and 2. FIG.
[0016]
In the example shown in FIG. 1, a ring-shaped magnet 12 having an N pole and an S pole
magnetized in the thickness direction on the bottom 11a of a wedge-shaped shield cover and
yoke 11 of a predetermined size is N-pole shield It adheres and fixes so that it may contact on the
bottom part 11a of the cover and yoke 11.
In this case, the ring-shaped magnet 12 is positioned by the magnet guide 11 b provided on the
bottom 11 a of the wedge-shaped shield cover and yoke 11.
[0017]
A yoke 13 in which a center pole 13a and a flange 13b are integrally formed on the S pole of the
ring magnet 12 is fixed so that the bottom surface of the flange 13b of the yoke 13 abuts.
[0018]
The ring-shaped magnet 14 in which the N pole and the S pole are magnetized in the thickness
direction is bonded and fixed onto the flange 13 b of the yoke 13 such that the S pole abuts on
the flange 13 b of the yoke 13.
In this case, the ring-shaped magnet 14 is positioned such that the center pole 13a of the yoke
13 penetrates and the ring-shaped magnet 14 is positioned by the magnet guide 13c provided on
the flange 13b of the yoke 13.
[0019]
A ring-shaped plate 15 is bonded and fixed onto the N pole of the ring-shaped magnet 14 and a
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magnetic gap 16 is formed between the inner peripheral surface of the plate 15 and the outer
peripheral surface of the center pole 13a.
Further, the outer peripheral surface of the plate 15 is in contact with the inner peripheral
surface of the upper end of the side wall of the wedge-shaped shield cover and yoke 11.
[0020]
In this embodiment, the plate 15 has a predetermined thickness and the inner peripheral portion
has an acute angle as shown in FIG. 1 so that the magnetic flux is concentrated.
There are various cases, such as making the upper part an acute angle, making the central part
an acute angle, and making the lower part an acute angle, to make the inner peripheral part an
acute angle.
In this example, the central portion is at an acute angle.
[0021]
In this case, the ring magnets 12 and 14 are magnetized in opposite directions, and the ring
magnet 12 forms a cancel magnet and covers the outer periphery of the ring magnets 12 and 14
by the wedge-shaped shield cover and yoke 11. Thus, a magnetically shielded speaker is
constructed.
[0022]
The speaker frame 17 is attached to the upper surface of the plate 15, and the outer peripheral
portion of the cone-shaped diaphragm 18 provided with the edge 19 on the outer periphery is
held by the gasket 20 on the outer peripheral portion of the frame 17.
[0023]
On the other hand, the voice coil bobbin 21 is attached to the inner peripheral portion of the
diaphragm 18, and the voice coil 22 is wound and adhesively fixed to the voice coil bobbin 21.
The voice coil 22 is mounted on the inner peripheral surface of the plate 15 and the center pole
of the yoke 13. It is inserted into the magnetic air gap 16 formed between the outer peripheral
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surfaces of 13a.
[0024]
In this embodiment, as shown in FIG. 2, the voice coil bobbin 21 is formed of a conductive
material, for example, an aluminum thin plate in a cylindrical shape, and the cylindrical joining
portion of the voice coil bobbin 21 is electrically connected. A conduction (short) state is
established over the entire area 21 to form a short coil.
[0025]
A reinforcing tape 23 for reinforcing the voice coil bobbin 21 is wound around the outer
peripheral surface of the voice coil bobbin 21 made of, for example, aluminum thin plate, and the
voice coil 22 is wound around the voice coil bobbin 21 and fixed by bonding.
In FIG. 2, reference numerals 22 a and 22 b denote voice coil lead wires for supplying an
acoustic signal of the voice coil 22.
Reference numeral 27 denotes a tinsel wire to be described later, one end of which is connected
to the input terminal 26 to which an acoustic signal is supplied, and the other end is adhesively
fixed on the reinforcing tape 23 The lead wires 22a and 22b are fixed by soldering.
[0026]
In this example, a soft adhesive is used as an adhesive for bonding and fixing the voice coil 22 to
the voice coil bobbin 21.
As this soft adhesive, for example, an alcohol reactivating adhesive such as lock varnish is used.
[0027]
Further, in FIG. 1, the voice coil 22 is held by the damper 24 in the magnetic gap 16.
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As the damper 24, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
Further, a cap 25 for preventing dust intrusion is provided to cover the upper surface of the
voice coil bobbin 21.
[0028]
Further, an input terminal 26 is provided at a predetermined position of the frame 17 of the
speaker, and an acoustic signal supplied to the input terminal 26 is supplied to the voice coil 22
through the tinsel cord 27.
[0029]
In the speaker of FIG. 1, the magnetic flux from the N pole of the ring magnet 14 is N pole of the
ring magnet 14 → plate 15 → magnetic air gap 16 → center pole 13a of the yoke 13 → flange
13b → ring shape It flows in the magnetic circuit of the S pole of the magnet 14.
[0030]
Further, the magnetic flux from the N pole of the ring magnet 12 is N pole of the ring magnet 12
→ bottom portion 11a of the shield cover and yoke 11 → side wall → plate 15 → magnetic gap
16 → center pole 13a of the yoke 13 → flange 13b → It flows in the magnetic circuit of the S
pole of the ring-shaped magnet 12.
[0031]
In this case, since the inner circumferential portion forming the magnetic gap 16 of the plate 15
has an acute angle, the magnetic flux is concentrated in the magnetic gap 16 and the magnetic
force of the magnetic gap 16 becomes extremely strong.
The magnetic force can be further enhanced by injecting a magnetic fluid having viscosity in the
magnetic field into the magnetic gap 16.
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Also, in this case, the amplitude is extremely small in the ultrahigh range, so there is no concern
that the voice coil 22 may be out of the magnetic gap 16.
[0032]
Therefore, when an acoustic signal is supplied from the input terminal 26 to the voice coil 22,
the voice coil 22 is driven according to this acoustic signal to drive the diaphragm 18.
In this case, the drive of the diaphragm 18 by the voice coil 22 is, for example, up to about 40
kHz.
[0033]
In this example, the voice coil bobbin 21 is made of, for example, a conductive material made of
an aluminum thin plate and the voice coil 22 is fixed to the voice coil bobbin 21 by a soft
adhesive. The adhesion by the soft adhesive is reduced, and the voice coil bobbin 21 and the
voice coil 22 are separated. At this time, the voice coil 22 operates as a drive coil and the voice
coil bobbin 21 made of, for example, aluminum thin plate. Constitutes an electromagnetic
induction type speaker operating as a short coil, and the diaphragm 18 is vibrated only by the
very lightweight voice coil bobbin 21. Further, in the present embodiment, the inner peripheral
portion of the plate 15 forming the magnetic gap 16 is Since the acute angle is set, the magnetic
force of the magnetic gap 16 is strong. It is possible to obtain a speaker which can reproduce for
example to the super high frequency range up to 100kHz.
[0034]
Moreover, FIG.3, FIG.4, FIG.5 and FIG. 6 show the other example of embodiment of the speaker of
this invention, respectively.
The examples shown in FIGS. 3, 4, 5 and 6 apply the present invention to a high-pitched speaker.
[0035]
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8
As shown in FIG. 3, the reference numeral 30 denotes a yoke in which the center pole 30a and
the flange 30b are integrally formed, and a ring shape in which an N pole and an S pole are
magnetized in the thickness direction on the flange 30b of the yoke 30. The magnet 31 is
adhered and fixed so that the S pole abuts on the flange 30 b of the yoke 30.
In this case, the ring shaped magnet 31 is formed such that the center pole 30a of the yoke 30
penetrates, and the ring shaped magnet 31 is positioned by the magnet guide 30c provided on
the flange 30b of the yoke 30.
[0036]
A ring-shaped plate 32 is adhered and fixed onto the N pole of the ring-shaped magnet 31, and a
magnetic gap 33 is formed between the inner peripheral surface of the plate 32 and the outer
peripheral surface of the center pole 30a.
[0037]
In the example shown in FIG. 3, the plate 32 has a predetermined thickness so that a
predetermined magnetic flux can be obtained, and the inner peripheral portion thereof has an
acute angle as shown in FIG. To do.
[0038]
In this example shown in FIG. 3, the diaphragm 34 has a dome shape of a nonconductive
material, the voice coil bobbin 35 is attached to the outer peripheral edge of the dome shaped
diaphragm 34, and the voice coil 36 is wound around the voice coil bobbin 35. The voice coil 36
is inserted into the magnetic gap 33.
[0039]
In this example of FIG. 3, the voice coil bobbin 35 is formed in a cylindrical shape of a conductive
material, for example, an aluminum thin plate as shown in FIG. 2, and the cylindrical attachment
portion of the voice coil bobbin 35 is electrically connected. The entire area of the voice coil
bobbin 35 is made conductive (shorted) to form a shorted coil.
That is, the voice coil bobbin 35 is also configured as shown in FIG.
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[0040]
Also in this example of FIG. 3, a soft adhesive is used as an adhesive for bonding and fixing the
voice coil 36 to the voice coil bobbin 35.
As this soft adhesive, for example, an alcohol reactivating adhesive such as lock varnish is used.
[0041]
Further, in the example of FIG. 3, in order to keep the voice coil 36 in the magnetic gap 33, a
magnetic fluid having viscosity in the magnetic field can be injected into the magnetic gap 33
and the voice coil bobbin 35 can be used. The above-mentioned soft adhesive 37 is adhered and
fixed between the outer peripheral portion of the upper and the inner peripheral upper portion
of the plate 32.
In this case, the adhesive strength of the soft adhesive 37 is reduced in the ultra high frequency
range, and does not affect the vibration of the voice coil bobbin 35 in the ultra high frequency
range at all.
When the magnetic fluid is injected into the magnetic gap 33, the width of the gap 33 becomes
smaller, and the magnetic force of the magnetic gap 33 increases.
[0042]
In the speaker of FIG. 3, the magnetic flux from the N pole of the ring magnet 31 is the N pole of
the ring magnet 31 → plate 32 → magnetic air gap 33 → center pole 30 a of the yoke 30 →
flange 30 b → ring shape It flows in the magnetic circuit of the S pole of the magnet 31.
[0043]
In this case, since the inner circumferential portion forming the magnetic gap 33 of the plate 32
has an acute angle, the magnetic flux is concentrated in the magnetic gap 33, and the magnetic
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10
force of the magnetic gap 33 becomes extremely strong.
Further, if a magnetic fluid is injected into the magnetic gap 33, the magnetic force can be
further increased.
Further, in this case, since the amplitude is extremely small in the ultrahigh range, there is no
concern that the voice coil 36 may be out of the magnetic air gap 33.
[0044]
Therefore, when an influence signal is supplied to the voice coil 36, the voice coil 36 vibrates in
response to the acoustic signal to drive the dome-shaped diaphragm 34.
In this case, the drive of the diaphragm 34 by the voice coil 36 is, for example, up to 40 kHz.
[0045]
In this example, the voice coil bobbin 35 is made of, for example, a conductive material made of
an aluminum thin plate and the voice coil 36 is fixed to the voice coil bobbin 35 by a soft
adhesive. The adhesion by the soft adhesive is reduced, and the voice coil bobbin 35 and the
voice coil 36 are separated. At this time, the voice coil 36 operates as a drive coil and the voice
coil bobbin 35 made of, for example, aluminum thin plate An electromagnetic induction type
speaker operating as a short coil is constituted, and the diaphragm 34 is vibrated only by the
very lightweight voice coil bobbin 35. Furthermore, in the present embodiment, the inner
peripheral portion of the plate 32 forming the magnetic gap 33 is acute-angled. So that the
magnetic force of this magnetic gap 33 is strong Ri, it is possible to obtain a speaker which can
reproduce for example to the super high frequency range up to 100kHz.
[0046]
Further, in the description of FIG. 4 according to an embodiment of the present invention, parts
corresponding to those in FIG.
[0047]
In the example of FIG. 4, a yoke 41 integrally formed with a center pole 41a and a flange 41b on
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the center of a bottom portion 40a of a wedge-shaped shield cover and yoke 40 having a
predetermined size is brought into contact with the bottom surface of the yoke 41. Adhesively
fix.
[0048]
A ring-shaped magnet 42 in which N and S poles are magnetized in the thickness direction is
bonded and fixed onto the flange 41 b of the yoke 41 so that the N pole abuts on the flange 41 b
of the yoke 41.
In this case, the ring-shaped magnet 42 is positioned such that the center pole 41 a of the yoke
41 penetrates and the magnet guide 41 c provided on the flange 41 b of the yoke 41 positions
the ring-shaped magnet 42.
[0049]
A ring-shaped plate 43 is bonded and fixed onto the south pole of the ring-shaped magnet 42,
and a magnetic gap 44 is formed between the inner peripheral surface of the plate 43 and the
outer peripheral surface of the center pole 41a.
[0050]
As shown in FIG. 4, the plate 43 has a predetermined thickness so that a predetermined magnetic
flux can be obtained, and the inner peripheral portion is made an acute angle so that the
magnetic flux is concentrated in the magnetic gap 44.
[0051]
Further, the ring-shaped magnet 45 having N and S poles magnetized in the thickness direction
on the plate 43 is adhered and fixed so that the S pole abuts on the plate 43.
In this case, the center pole 41 a of the yoke 41 penetrates the ring-shaped magnet 45.
Further, the ring-shaped magnets 42 and 45 are magnetized in opposite directions to each other.
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[0052]
A ring-shaped plate 46 is bonded and fixed onto the N pole of the ring-shaped magnet 45, and a
magnetic gap 47 is formed between the inner peripheral surface of the plate 46 and the outer
peripheral surface of the center pole 41a.
Further, the outer peripheral surface of the plate 46 is in contact with the inner peripheral
surface of the upper end of the side wall of the wedge-shaped shield cover and yoke 40.
[0053]
In this example of FIG. 4, the magnetic flux from the ring magnets 42 and 45 flows through the
shield cover and yoke 40, the yoke 41, and the plates 44 and 46, so that the leakage flux is small,
and a magnetic shield type speaker is formed.
[0054]
Also in this example shown in FIG. 4, the diaphragm 34 has a dome shape of nonconductive
material, the voice coil bobbin 35 is attached to the outer peripheral edge of the dome shaped
diaphragm 34, and the voice coil 36 is wound around the voice coil bobbin 35. The voice coil 36
is bonded and fixed, and inserted into the magnetic gap 44 formed between the inner peripheral
surface of the plate 43 and the outer peripheral surface of the center pole 41 a of the yoke 41.
[0055]
Also in this example of FIG. 4, this voice coil bobbin 35 is configured as shown in FIG.
That is, the voice coil bobbin 35 is formed of a conductive material such as an aluminum thin
plate in a cylindrical shape, and the entire area of the voice coil bobbin 35 is made conductive
(shorted) to form a shorted coil.
[0056]
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13
Also in this example of FIG. 4, a soft adhesive is used as an adhesive for bonding and fixing the
voice coil 36 to the voice coil bobbin 35.
As this soft adhesive, for example, an alcohol reactivating adhesive such as lock varnish is used.
[0057]
Further, in the example of FIG. 4, in order to keep the voice coil 36 in the magnetic gap 44, it is
possible to inject a magnetic fluid having viscosity in the magnetic field into the magnetic gap 44
and the voice coil bobbin 35. The above-mentioned soft adhesive 37 is adhered and fixed
between the outer peripheral portion of the plate 46 and the inner peripheral portion of the plate
46.
In this case, the adhesive strength of the soft adhesive 37 is reduced in the ultra high frequency
range, and does not affect the vibration of the voice coil bobbin 35 in the ultra high frequency
range at all.
When the magnetic fluid is injected into the magnetic gap 44, the width of the magnetic gap 44
is reduced, and the magnetic force of the magnetic gap 33 is increased.
[0058]
In the speaker of FIG. 4, the magnetic flux from the N pole of the ring magnet 42 is N pole of the
ring magnet 42 → flange 41 b of the yoke 41 → center poke 41 a → magnetic gap 44 → plate
43 → ring magnet Magnetic circuit of S pole of 42, N pole of ring magnet 42 → flange 41 b of
yoke 41 → bottom 40 a of shield cover and yoke 40 → side wall → plate 46 → magnetic gap 47
→ center pole 41 a of yoke 41 → magnetic gap 44 → plate 43 → flows through the magnetic
circuit of the S pole of the ring-shaped magnet 42.
[0059]
The magnetic flux from the N pole of the ring magnet 45 is N pole of the ring magnet 45 → plate
46 → magnetic gap 47 → center pole 41 a of the yoke 41 → magnetic gap 44 → plate 43 → S
pole of the ring magnet 45 Magnetic circuit and N pole of ring magnet 45 → plate 46 → side
wall of shield cover and yoke 40 → bottom 40 a → flange 41 b of yoke 41 → center pole 41 a →
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magnetic gap 44 → plate 43 → ring magnet 45 S It flows with the magnetic circuit of the pole.
[0060]
Therefore, in the example shown in FIG. 4, the magnetic flux in the same direction from the two
ring magnets 42 and 45 flows to the magnetic gap 44, and the magnetic force of the magnetic
gap 44 can be increased.
[0061]
In this case, since the inner circumferential portion forming the magnetic gap 44 of the plate 43
has an acute angle, the magnetic flux is concentrated in the magnetic gap 44, and the magnetic
force of the magnetic gap 44 becomes extremely strong.
Further, if magnetic fluid is injected into the magnetic gap 44, the magnetic force can be further
increased.
Also, in this case, since the amplitude is extremely small in the ultra high frequency range, there
is no concern that the voice coil 36 may deviate from the magnetic air gap 44.
[0062]
Therefore, when an acoustic signal is supplied to the voice coil 36, the voice coil 36 vibrates in
response to the acoustic signal to drive the dome-shaped diaphragm 34.
In this case, the drive of the diaphragm 34 by the voice coil 36 is, for example, up to 40 kHz.
[0063]
In this example, the voice coil bobbin 35 is made of, for example, a conductive material made of
an aluminum thin plate and the voice coil 36 is fixed to the voice coil bobbin 35 by a soft
adhesive. The adhesion by the soft adhesive is reduced, and the voice coil bobbin 35 and the
voice coil 36 are separated. At this time, the voice coil 36 operates as a drive coil and the voice
coil bobbin 35 made of, for example, aluminum thin plate An electromagnetic dielectric type
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speaker operating as a short coil is formed, and the diaphragm 34 is vibrated only by the very
lightweight voice coil bobbin 35. Furthermore, in the present embodiment, the inner peripheral
portion of the plate 43 forming the magnetic gap 44 is acute angled. The magnetic force of this
magnetic gap 44 is strong. Ri, it is possible to obtain a speaker which can reproduce for example
to the super high frequency range up to 100kHz.
[0064]
The example of FIG. 5 shows the example of FIG. 3 as a dynamic type speaker in the ultrahigh
range.
In order to explain this FIG. 5 example, the same reference numerals are given to parts
corresponding to FIG. 3 example and the details will be omitted.
[0065]
In the example of FIG. 5, the voice coil bobbin 35 and the voice coil 36 of the example of FIG. 3
are the voice coil bobbin 38 as shown in FIG.
That is, in the example shown in FIG. 5, the diaphragm 34 is in the form of a dome made of a
nonconductive material, the voice coil bobbin 38 is attached to the outer peripheral edge of the
dome 34 and the voice coil bobbin 38 is inserted into the magnetic gap 33. It does like that.
[0066]
In this example of FIG. 5, as shown in FIG. 7, the voice coil bobbin 38 is formed of a conductive
material, for example, an aluminum thin plate in a cylindrical shape, and the voice coil bobbin 38
is provided with slits 38a extending in the longitudinal direction to make one turn of voice. Input
terminals 38b and 38c are provided at one end and the other end of the one-turn voice coil,
respectively, without a voice coil, and high frequency signals of acoustic signals are supplied
between the input terminals 38b and 38c. It does like that.
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16
The other components in FIG. 5 are the same as those in FIG.
[0067]
In the example shown in FIG. 5, when the high frequency signal of the acoustic signal is supplied
to the voice coil of one turn composed of the voice coil bobbin 38, the diaphragm 34 vibrates
according to the acoustic signal to reproduce the high sound signal.
[0068]
Further, in the example of FIG. 5, since the inner peripheral portion of the plate 32 forming the
magnetic gap 33 is made to have an acute angle as in the example of FIG. 3, in the magnetic gap
33, magnetic flux is concentrated at this acute angle portion, Since the voice coil bobbin 38
functions as a one-turn voice coil while the magnetic force of the magnetic gap 33 increases, the
diaphragm is made of a very light-weight voice coil bobbin 38 in an ultra high frequency range.
The voice coil vibrates, and for example, it is possible to reproduce up to the super high
frequency range up to 100 kHz.
Further, FIG. 6 shows an example in which FIG. 4 is a dynamic type speaker in the super high
range.
In order to explain this FIG. 6 example, the same reference numerals are given to the parts
corresponding to FIG. 4 and the detailed explanation thereof will be omitted.
[0069]
In the example of FIG. 6, the voice coil bobbin 35 and the voice coil 36 of the example of FIG. 4
are the voice coil bobbin 38 as shown in FIG.
That is, in the example shown in FIG. 6, the diaphragm 34 has a dome shape made of a
nonconductive material, the voice coil bobbin 38 is attached to the outer peripheral edge of the
dome shaped diaphragm 34 and the voice coil bobbin 38 is inserted into the magnetic gap 44 It
does like that.
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[0070]
In this example shown in FIG. 6, as shown in FIG. 7, the voice coil bobbin 38 is formed of a
conductive material, for example, an aluminum thin plate in a cylindrical shape, and the voice coil
bobbin 38 is provided with slits 38a extending in the longitudinal direction. Input terminals 38b
and 38c are provided at one end and the other end of the one-turn voice coil, respectively,
without providing a voice coil as a coil, and high frequency signals of acoustic signals are
supplied between the input terminals 38b and 38c. It does like that. The other components in
FIG. 6 are the same as those in FIG.
[0071]
In the example shown in FIG. 6, when the high frequency signal of the acoustic signal is supplied
to the voice coil of one turn composed of the voice coil bobbin 38, the diaphragm 34 vibrates
according to the acoustic signal to reproduce the high sound signal.
[0072]
Further, in the example shown in FIG. 6, since the inner peripheral portion of the plate 43
forming the magnetic gap 44 has an acute angle as in the example shown in FIG. 4, in the
magnetic gap 44, the magnetic flux is concentrated at the acute angle portion Since the voice coil
bobbin 38 functions as a one-turn voice coil while the magnetic force of the magnetic gap 44
increases, the diaphragm is made of a very light-weight voice coil bobbin 38 in the super high
frequency range. The voice coil of the present invention vibrates, and for example, a high-pitched
speaker capable of reproducing up to an ultra high frequency band up to 100 kHz can be
obtained.
[0073]
When using the high-tone speaker according to this embodiment as shown in FIGS. 1, 3, 4, 5, and
6, as shown in FIG. If a speaker 51 for high sound according to the example is provided and
connected in series to the voice coil of the main speaker 50, it is connected in series to the voice
coil of the high sound speaker (including the voice coil of one turn consisting of a voice coil
bobbin), Even if the impedance of the high-tone voice coil is small, the matching transformer can
be omitted.
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In the speaker apparatus of FIG. 8, the speaker of FIG. 1 is used as the high sound speaker 51.
[0074]
In the speaker apparatus of FIG. 8, 52 is a speaker box, 53 is a baffle plate, 54 is a duct, and 54a
is an opening of the duct.
[0075]
The present invention is not limited to the above-described example, and it goes without saying
that various other configurations can be taken without departing from the scope of the present
invention.
[0076]
According to the present invention, since the inner periphery of the plate forming the magnetic
gap is made an acute angle, in this magnetic gap, the magnetic flux is concentrated at this acute
angle portion, and the magnetic force of the magnetic gap is generated. According to the present
invention, the voice coil is fixed to the voice coil bobbin by the soft adhesive, and the adhesion by
the soft adhesive is reduced in the super high frequency range, and the voice coil bobbin and the
voice coil are reduced. The voice coil operates as a drive coil, and the voice coil bobbin made of a
conductive material constitutes an electromagnetic induction type speaker operating as a short
coil, and the diaphragm is made by the vibration of the very light voice coil bobbin. It can be
driven, for example, it can be reproduced up to the super high frequency range up to 100 kHz,
and a speaker for high frequency can be obtained
[0077]
Further, according to the present invention, since the inner periphery of the plate forming the
magnetic gap is made an acute angle, in this magnetic gap, the magnetic flux is concentrated at
this acute angle portion, and the magnetic force of the magnetic gap becomes large. Function as
a one-turn voice coil, so in the ultra-high range, the diaphragm is vibrated by the one-turn voice
coil consisting of a very lightweight voice coil bobbin, for example, an ultra-high range up to 100
kHz It is possible to obtain a high-pitched speaker that can be reproduced up to.
12-05-2019
19
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