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JP2001008288

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DESCRIPTION JP2001008288
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
wide reproduction band speaker and speaker apparatus capable of reproducing up to an ultra
high frequency band up to, for example, 100 kHz.
[0002]
BACKGROUND OF THE INVENTION In general, in a speaker, expanding a reproduction band
while maintaining good directivity and high sound quality means deterioration of directivity
characteristics due to the aperture of the speaker and high sound. The relationship between the
mass and the material of the diaphragm made of one cone paper in frequency and the large mass
of the voice coil became a problem, which was extremely difficult.
[0003]
[0003] In addition, to make the 2-way in a compact state, a speaker for high sound will be
installed on the front face of the diaphragm made of cone paper of the main speaker, an arm etc.
for supporting this high sound speaker and this high sound There is a disadvantage that the
sound quality is impaired due to the reflection of the sound by the speaker.
[0004]
SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention
to propose a speaker and a speaker apparatus capable of expanding a reproduction band while
maintaining good directivity and high sound quality.
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[0005]
SUMMARY OF THE INVENTION In the speaker according to the present invention, a first voice
coil bobbin is attached to the inner peripheral portion of a cone-shaped main diaphragm, and a
voice coil is wound around the first voice coil bobbin, In the speaker inserted in the first
magnetic gap formed between the inner peripheral surface of the plate and the outer peripheral
surface of the center pole, the high-tone diaphragm is provided on a part of the slope of the main
diaphragm, and this high-pitched speaker The super high sound drive means which drives a
diaphragm is provided.
[0006]
According to the present invention, since the high-tone diaphragm is provided on part of the
slopes of the main diaphragm, there is nothing in front of the main diaphragm and the high-tone
diaphragm, and a good high-frequency band can be obtained. It is possible to obtain a wide
reproduction band speaker capable of reproducing to the super high frequency range of the
characteristic and the directional characteristic.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a speaker according to the
present invention will now be described with reference to FIGS. 1 to 4. FIG.
[0008]
In the example of FIG. 1, the bottom of the flange 2b of the yoke 2 in which the center pole 2a
and the flange 2b are integrally formed is brought into contact with the center of the bottom 1a
of the wedge-shaped shield cover and yoke 1 having a predetermined size. Fix adhesively.
[0009]
A ring-shaped magnet 3 having N and S poles magnetized in the thickness direction is bonded
and fixed onto the flange 2b of the yoke 2 so that the N pole abuts on the flange 2b of the yoke
2.
In this case, the ring-shaped magnet 3 is positioned such that the center pole 2 a passes through
the ring-shaped magnet 3 and the magnet guide 2 c provided on the flange 2 b of the yoke 2.
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[0010]
A ring-shaped plate 4 is bonded and fixed onto the south pole of the ring-shaped magnet 3 and a
magnetic gap 5 is formed between the inner peripheral surface of the plate 4 and the outer
peripheral surface of the center pole 2a.
[0011]
A ring-shaped magnet 6 having an N pole and an S pole magnetized in the thickness direction on
the plate 4 is adhered and fixed so that the S pole abuts on the plate 4.
In this case, the ring-shaped magnet 6 and the ring-shaped magnet 3 are magnetized in opposite
directions.
[0012]
A ring-shaped plate 7 is bonded and fixed onto the N pole of the ring-shaped magnet 6, and a
magnetic gap 8 is formed between the inner peripheral surface of the plate 7 and the outer
peripheral surface of the center pole 2a. The outer peripheral surface of 7 is brought into contact
with the inner peripheral surface of the upper end of the side wall of the shield cover / yoke 1
having a wedge shape.
[0013]
Further, the frame 9 of the speaker is attached to the upper surface of the plate 7, and the outer
peripheral portion of the main diaphragm 10 of cone shape provided with the edge 11 on the
outer peripheral portion is held and fixed to the frame 9 by the gasket 12. Do.
[0014]
On the other hand, a voice coil bobbin 13 is attached to the inner peripheral portion of the main
diaphragm 10, a voice coil 14 is wound around the voice coil bobbin 13, and the voice coil 14 is
inserted into the magnetic gap 5 in this example. .
[0015]
In this embodiment, the magnetic flux from the N pole of the ring magnet 3 is: N pole of the ring
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magnet 3 → flange 2 b of the yoke 2 → center pole 2 a → magnetic gap 5 → plate 4 → ring
magnet 3 Magnetic circuit of S pole, N pole of ring magnet 3 → flange 2 b of yoke 2 → bottom 1
a of shield cover and yoke 1 → side wall → plate 7 → magnetic gap 8 → center pole 2 a →
magnetic gap 5 → plate 4 → It flows in the magnetic circuit of the S pole of the ring-shaped
magnet 3.
[0016]
The magnetic flux from the N pole of the ring magnet 6 is the N pole of the ring magnet 6 →
plate 7 → magnetic air gap 8 → center pole 2 a → magnetic air gap 5 → plate 4 → S pole of the
ring magnet 6 Magnetic circuit and N pole of ring magnet 6 → plate 7 → side wall of shield
cover and yoke 1 → bottom 1 a → flange 2 b of yoke 2 → center pole 2 a → magnetic gap 5 →
plate 4 → ring magnet 6 S It flows with the magnetic circuit of the pole.
[0017]
Accordingly, the magnetic flux in the same direction from the two ring-shaped magnets 3 and 6
flows in the magnetic gap 5, and the magnetic force (magnetic flux) of the magnetic gap 5
becomes strong.
[0018]
The voice coil 14 is held by the damper 15 in the magnetic gap 5.
As the damper 15, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
Further, a cap 16 for preventing dust intrusion is provided so as to cover the upper surface of the
voice coil bobbin 13.
[0019]
Further, in this embodiment, as shown in FIGS. 1, 2 and 3, for example, an elliptical high-tone
diaphragm having an edge 20a at a predetermined position on a part of the slope of the main
diaphragm 10 having a cone shape. 20 is provided integrally with the main diaphragm 10.
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The high-tone diaphragm 20 may be made of the same material as the main diaphragm 10, but
may be made of another material, for example, lightweight, highly rigid paper.
[0020]
In this embodiment, as the super-high sound drive means for driving the high sound diaphragm
20, a one-turn planar voice coil 21 as shown in FIGS. 1 to 4 and a straight line for inserting the
flat voice coil 21. And a magnetic gap 22.
[0021]
As this one-turn planar voice coil 21, as shown in FIG. 4, a substantially U-shaped conductive
material thin plate such as an aluminum thin plate 21a is integrally provided with a reinforcing
nonconductive material such as a synthetic resin plate 21b. In this case, both ends of the
aluminum thin plate 21a are used as terminals 21c and 21d, and an ultra high sound signal is
supplied to the terminals 21c and 21d.
[0022]
In this embodiment, as shown in FIGS. 1 to 3, the sides of the terminals 21c and 21d of the
planar voice coil 21 of one turn as shown in FIG. 4 are main diaphragms of the high-tone
diaphragm 20. It adheres and fixes along the center of the major axis along the slope of ten.
[0023]
As a magnetic circuit configuration of this super high sound drive means, as shown in FIG. 3,
rectangular plate shaped yokes 24a and 24b of the same shape are adhesively fixed to the N pole
and S pole face of the rectangular parallelepiped magnet 23, respectively. One end sides of
rectangular plates 25a and 25b are fixed to the upper end surfaces of the plate-like yokes 24a
and 24b, respectively, and a linear magnetic gap 22 is formed between the other end surfaces of
the rectangular plates 25a and 25b.
[0024]
In this case, the planar voice coil 21 is inserted into the linear magnetic air gap 22 and the
magnetic circuit is fixed to the frame 9.
[0025]
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The magnetic flux from the N pole of the magnet 23 is the magnetic circuit of the N pole of the
magnet 23 → the plate yoke 24 a → the plate 25 a → the magnetic gap 22 → the plate 25 b →
the plate yoke 24 b → the S pole of the magnet 23 Flow.
[0026]
Further, an input terminal 17 is provided at a predetermined position of the frame 9, and an
acoustic signal from the input terminal 17 is supplied to the voice coil 14 and the planar voice
coil 21 of one turn through the tinsel wire 18.
In this case, in this example, since the impedance value of the one-turn planar voice coil 21 is
extremely small, the one-turn planar voice coil 21 is connected in series to the voice coil 14 as
shown in FIG. An acoustic signal 26 is supplied to the series circuit of the voice coils 14 and 21.
Further, in this case, a high-pass capacitor 27 is connected in parallel to the voice coil 14 so that
an ultra high range signal is satisfactorily supplied to the voice coil 21.
[0027]
In this case, when an acoustic signal is supplied to the flat voice coil 21 of one turn, the high-tone
diaphragm 20 and the flat voice coil 21 of one turn operate as a dynamic type speaker, and the
flat surface of this one turn Since the voice coil 21 and the like are very lightweight, the hightone diaphragm 20 can be reproduced up to, for example, an ultra-high range of 100 kHz.
[0028]
When an acoustic signal is supplied from the input terminal 17 of the loudspeaker according to
this embodiment, the acoustic signal drives the voice coil 14 for driving the main diaphragm 10
and the one-turn planar shape for driving the high-tone diaphragm 20. It is supplied to the voice
coil 21 and reproduced to, for example, about 40 kHz by the main diaphragm 10, and
reproduced to, for example, a super high frequency band to, for example, 100 kHz by the hightone diaphragm 20. It is possible to obtain a two-way speaker with a wide reproduction band that
can reproduce up to the ultra high frequency range up to 100 kHz.
[0029]
Further, according to this embodiment, since the high-tone diaphragm 20 is provided on part of
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the slopes of the main diaphragm 10, nothing is present in front of the main diaphragm 10 and
the high-tone diaphragm 20. Thus, it is possible to obtain a wide reproduction band speaker
capable of reproducing up to the ultra high range of high range characteristics and directivity
characteristics.
[0030]
Further, according to the present embodiment, the magnetic flux from the respective N poles of
the ring-shaped magnets 3 and 6 is the yoke 2 and the wedge-shaped ones in which the plates 4
and 7, the center pole 2a and the flange 2b are integrally formed Since the magnetic circuit
which returns to the S pole of the ring-shaped magnets 3 and 6 through the shield cover / yoke 1
is configured, the magnetically shielded speaker can be obtained with a simple configuration that
does not require a cancel magnet or the like.
[0031]
Further, according to the present embodiment, since the magnetic shield type is provided, the
leakage flux is reduced, and the magnetic fluxes from the two ring magnets 3 and 6 flow in the
same direction to the magnetic gap 5, respectively. The magnetic force of 5 is increased, the
force for driving the main diaphragm 10 is increased, and the sensitivity and the sound quality
are improved.
[0032]
6 to 9 show other examples of the embodiment of the present invention.
In FIG. 6 to FIG. 9, parts corresponding to those in FIG. 1 to FIG. 5 are given the same reference
numerals, and the detailed description thereof will be omitted.
[0033]
In the example of FIG. 6, in the example of FIG. 1, an electromagnetic induction type as shown in
FIG. 7 to FIG.
That is, as the super high sound drive means for driving the high sound diaphragm 20, as shown
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in FIGS. 6 to 9, a planar short coil 30, a linear magnetic air gap 22 into which the planar short
coil 30 is inserted, and The magnetic field of the linear magnetic air gap 22 is constituted by the
drive coil 31 which fluctuates according to the super high range signal.
[0034]
As shown in FIG. 9, as the planar short coil 30, an opening 30a is provided at a predetermined
position in the center of a substantially rectangular conductive material thin plate such as an
aluminum thin plate, and a nonconductive material such as a synthetic resin film is provided in
the opening 30a. As a result, a short current is caused to flow around the periphery of the
opening 30a.
[0035]
In the present embodiment, as shown in FIG. 9, the upper side of the planar short coil 30 is
shown in FIGS. 6-8, and the major axis along the slope of the main diaphragm 10 of the high-tone
diaphragm 20. Bonding along the center of
[0036]
As shown in FIGS. 8A and 8B, as the magnetic circuit configuration of this super-high sound drive
means, rectangular fixed plate-like yokes 24a and 24b of the same shape are adhesively fixed to
the N pole and S pole face of the rectangular parallelepiped magnet 23, respectively. The one end
sides of rectangular plates 25a and 25b are fixed to the upper end surfaces of the plate-like
yokes 24a and 24b, respectively, and a linear magnetic gap 22 is formed between the other end
surfaces of the rectangular plates 25a and 25b. As shown in 8A and 8B, the drive coil 31 is
wound along the outer periphery of the plate 25b, and an acoustic signal is supplied to the drive
coil 31.
[0037]
Therefore, this super high sound drive means changes the magnetic field of the magnetic gap 22
by the drive coil 31 according to the acoustic signal, operates as an electromagnetic induction
type speaker, drives the planar short coil 30, and vibrates for high sound. The board 20 can be
reproduced to, for example, an ultra high frequency range of 100 kHz.
Others are configured in the same manner as in FIG.
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[0038]
When an acoustic signal is supplied from the input terminal 17 of the speaker according to FIG. 6
and supplied to the voice coil 14 and the drive coil 31 for driving the main diaphragm 10, for
example, 40 kHz for the main diaphragm 10. In the superhigh range, the magnetic field of the
magnetic gap 22 is changed by the drive coil 31. In the high-tone diaphragm 20, the superhigh
range up to, for example, 100 kHz is reproduced. For example, it is possible to obtain a two-way
speaker with a wide reproduction band capable of reproducing up to an ultra high frequency
band up to 100 kHz, for example.
[0039]
Therefore, it can be easily understood that in the example of FIG. 6 as well, the same effect as
that of the example of FIG. 1 can be obtained.
[0040]
10 to 13 show another example of the embodiment of the present invention.
10 to FIG. 13, parts corresponding to those in FIG. 1 to FIG. 5 are given the same reference
numerals, and detailed descriptions thereof will be omitted.
[0041]
This example of FIG. 10 is a dynamic type using a cylindrical voice coil bobbin as shown in FIGS.
11 to 13 as an ultra-high sound drive means for driving the high-tone diaphragm 20 in the
example of FIG. is there.
[0042]
Also in this example of FIG. 10, as shown in FIGS. 10 to 13, for example, an elliptical high-tone
diaphragm 20 having an edge 20a at a predetermined position on a part of the slope of the main
diaphragm 10 of cone shape. It is provided integrally with the main diaphragm 10.
The high-tone diaphragm 20 may be made of the same material as the main diaphragm 10, but
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may be made of another material, for example, lightweight, highly rigid paper.
[0043]
In this embodiment, as the super-high-sound drive means for driving the high-tone diaphragm
20, as shown in FIGS. 10 to 13, a one-turn voice coil consisting of a voice coil bobbin 35 and this
voice coil are inserted. It comprises a ring-shaped magnetic air gap 36.
[0044]
As the voice coil bobbin 35 constituting the voice coil of one turn, a gap 35a extending in the
longitudinal direction is provided in a cylindrical body made of a thin plate of conductive
material such as an aluminum thin plate as shown in FIG. The input terminals 35b and 35c are
provided on both sides of the gap 35a, and an acoustic signal is supplied between the input
terminals 35b and 35c.
[0045]
In the example of FIG. 10, the upper end of the voice coil bobbin 35 as shown in FIG. 13 is
adhered and fixed to the inner peripheral portion of the high-tone diaphragm 20.
[0046]
As shown in FIG. 12, the magnetic circuit configuration of the super high sound drive means of
this FIG. 10 example includes an N pole in the thickness direction on the flange 37b of the yoke
37 integrally formed with the center pole 37a and the flange 37b. The S pole of the ring-shaped
magnet 38 in which the S pole is magnetized is brought into contact with and fixed.
In this case, the ring-shaped magnet 38 passes through the center pole 37 a of the yoke 37.
[0047]
A ring-shaped plate 39 is adhered and fixed onto the N pole of the ring-shaped magnet 38, and a
ring-shaped magnetic gap 36 is formed between the inner peripheral surface of the plate 39 and
the outer peripheral surface of the center pole 37a of the yoke 37. Form.
[0048]
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10
In this case, the lower end side of the voice coil bobbin 35 attached to the high-tone diaphragm
20 is inserted into the ring-shaped magnetic gap 36, and the magnetic circuit configuration is
fixed to the frame 9.
[0049]
The magnetic flux from the N pole of the ring magnet 38 is the N pole of the ring magnet 38 →
plate 39 → magnetic air gap 36 → center pole 37a of the yoke 37 → flange 37b → S pole of the
ring magnet 38 The magnetic flux flows in the magnetic air gap 36.
[0050]
Therefore, when an acoustic signal is supplied to the voice coil of one turn comprising the voice
coil bobbin 35, the diaphragm 20 for high-pitched sound and the voice coil bobbin 35
constituting the voice coil of one turn operate as a dynamic type speaker Since the voice coil
bobbin 35 and the like that constitute the one-turn voice coil are very lightweight, the high-tone
diaphragm 20 can be reproduced up to, for example, an ultra-high frequency range of 100 kHz.
Further, in FIG. 11, FIG. 12, and FIG. 13, reference numeral 40 denotes a dust-introducing chip
provided on the voice coil bobbin 35.
[0051]
This example of FIG. 10 is otherwise configured in the same manner as the example of FIG.
Also in this example of FIG. 10, since the impedance value of the voice coil bobbin 35
constituting the voice coil of one turn is extremely small, the voice coil of one turn consisting of
the voice coil bobbin 35 is connected in series to the voice coil 14 as shown in FIG. Connection is
made to supply an acoustic signal to the series circuit of the voice coils 14 and 35.
In this case, a high-pass capacitor 27 is connected in parallel to the voice coil 14 so that an ultra
high range signal is satisfactorily supplied to the voice coil 35.
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[0052]
When an acoustic signal is supplied from the input terminal 17 of the speaker according to the
example of FIG. 10 and this acoustic signal is supplied to the voice coil of one turn consisting of
the voice coil 14 and the voice coil bobbin 35 for driving the main diaphragm 10 Is reproduced
by the main diaphragm 10 to, for example, 40 kHz, and is reproduced to the super high range of,
for example, 100 kHz by the high-tone diaphragm 20. According to the speaker according to this
example of FIG. It is possible to obtain a two-way speaker with a wide reproduction band that can
reproduce into the sound range.
[0053]
Therefore, it can be easily understood that in the example of FIG. 10 as well, the same function
and effect as the example of FIG. 1 can be obtained.
[0054]
FIGS. 14 to 17 show other examples of the embodiment of the present invention.
14 to FIG. 17, the parts corresponding to those of FIG. 10 to FIG.
[0055]
In the example shown in FIG. 14, in the example shown in FIG. 10, an electromagnetic induction
type as shown in FIGS.
That is, a voice coil bobbin 41 constituting a short coil as shown in FIGS. 14 to 17 as super-high
sound drive means for driving the high sound diaphragm 20, a magnetic gap 36 for inserting the
voice coil bobbin 41, and the magnetic gap It comprises the drive coil 42 provided in the inside
of 36.
[0056]
As this voice coil bobbin 41, as shown in FIG. 17, a thin plate of a conductive material, for
example, an aluminum thin plate, is formed in a cylindrical shape, and a short circuit is made
over the entire area.
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[0057]
In this embodiment, the upper end of the voice coil bobbin 41 as shown in FIG. 17 is adhered and
fixed to the inner peripheral portion of the high sound diaphragm 20 and the lower end portion
of the voice coil bobbin 41 is the inner peripheral surface of the plate 39. And the magnetic gap
36 formed between the outer peripheral surfaces of the center pole 37a of the yoke 37.
[0058]
A drive coil 42 is wound along the outer periphery of the center pole 37a in the magnetic gap
36, and an acoustic signal is supplied to the drive coil 42.
[0059]
In this case, the super high frequency drive means changes the magnetic field in the magnetic
gap 36 by the drive coil 42 according to the acoustic signal, operates as an electromagnetic
induction speaker, and drives the short coil of the voice coil bobbin 41. The high-tone diaphragm
20 can reproduce, for example, an ultra-high range of 100 kHz.
[0060]
The example of FIG. 14 is configured in the same manner as the example of FIG. 1 and the
example of FIG.
[0061]
When an acoustic signal is supplied from the input terminal 17 of the loudspeaker shown in FIG.
14 to the voice coil 14 and the drive coil 42 for driving the main diaphragm 10, the main
diaphragm 10 reproduces, for example, up to 40 kHz. In the super high frequency range, the
magnetic field of the magnetic gap 36 is changed by the drive coil 42, and the high frequency
range up to 100 kHz, for example, is reproduced by the high frequency diaphragm 20. According
to the speaker of FIG. For example, it is possible to obtain a two-way speaker with a wide
reproduction band capable of reproducing up to an ultra high frequency band up to 100 kHz.
[0062]
Therefore, it can be easily understood that the same function and effect as the example of FIG. 1
can be obtained also in the example of FIG.
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[0063]
FIG. 18 shows a phase-reversal type speaker apparatus in which a speaker of a wide
reproduction band capable of reproducing to a super high frequency band of good high
frequency characteristics and directivity characteristics as shown in FIG. 1 is attached to a small
speaker box 50. An example is shown.
As shown in FIG. 18, in FIG. 18, a speaker sound emission hole 51 a is formed in a baffle plate 51
provided on the front surface of a speaker box 50 which is formed into a substantially
rectangular box shape by ABS resin or the like. Fix the speaker as shown in FIG. 1 example.
[0064]
Further, an acoustic signal from the input terminal 52 provided at a predetermined position
outside the speaker box 50 is supplied to the input terminal 17 of the speaker through the
connection line 53, and the acoustic signal from the input terminal 17 is a tinsel wire. The voice
coil 14 and the planar voice coil 21 of one turn are supplied via the line 18.
[0065]
Further, a duct 54 having an opening 54a in the same plane as the speaker sound output hole
51a of the baffle plate 51 is provided, and sound is transmitted from the back of the main
diaphragm 10 and the high sound diaphragm 20 of the speaker to the opening 54a of the duct
54. It radiates more to the front of the speaker device.
[0066]
In this case, the phases of the sound emitted from the back of the main diaphragm 10 and the
high-tone diaphragm 20 of this speaker are inverted and radiated from the duct 54 to the outside
of the speaker box 50, and the main diaphragm 10. And, the low frequency range of the sound
emitted from the high-tone diaphragm 20 is expanded.
[0067]
According to the speaker device of this embodiment, it is possible to obtain a small-sized speaker
device having a wide reproduction band which can reproduce even a super high frequency band
of good high frequency characteristics and directional characteristics.
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[0068]
In the example of FIG. 18 described above, the speaker shown in FIG. 1 is built in the small
speaker box 50, but the speakers shown in FIGS. 6, 10 and 14 are built in the small speaker box.
It can be easily understood that the same operation and effect as in the example of FIG. 18 can be
obtained in this case as well.
[0069]
Of course, the present invention is not limited to the above-described example, and various other
configurations can be adopted without departing from the scope of the present invention.
[0070]
According to the present invention, it is possible to obtain a two-way speaker with a wide
reproduction band which can be reproduced up to an ultra high frequency band up to, for
example, 100 kHz.
[0071]
Further, according to the present invention, since the high-tone diaphragm is provided on part of
the slopes of the main diaphragm, there is nothing in front of the main diaphragm and the hightone diaphragm, and good high-frequency characteristics are obtained. Thus, it is possible to
obtain a wide reproduction band speaker and speaker device capable of reproducing up to the
super high frequency range of directivity characteristics.
[0072]
Brief description of the drawings
[0073]
1 is a cross-sectional view showing an example of an embodiment of the speaker of the present
invention.
[0074]
2 is a partially cutaway top view of the example of FIG.
[0075]
3 is an enlarged sectional view showing an example of the main part of FIG. 1 example.
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[0076]
4 is a front view showing an example of a planar voice coil.
[0077]
5 is a connection diagram for explaining the example of FIG.
[0078]
6 is a cross-sectional view showing another example of the embodiment of the speaker of the
present invention.
[0079]
7 is a partially cutaway top view of the example of FIG.
[0080]
FIG. 8A is an enlarged sectional view showing an example of an essential part of FIG. 6 example.
B is a top view of the example of the principal part of the example of FIG.
[0081]
9 is a front view showing an example of a short coil.
[0082]
10 is a cross-sectional view showing another example of the embodiment of the speaker of the
present invention.
[0083]
11 is a partially cutaway top view of the example of FIG.
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[0084]
12 is an enlarged sectional view showing an example of the main part of FIG. 10 example.
[0085]
13 is a perspective view showing an example of a voice coil bobbin.
[0086]
FIG. 14 is a cross-sectional view showing another example of the embodiment of the speaker
according to the present invention.
[0087]
15 is a partially cutaway top view of the example of FIG.
[0088]
16 is an enlarged sectional view showing an example of the main part of FIG. 14 example.
[0089]
17 is a perspective view showing an example of a voice coil bobbin.
[0090]
<Figure 18> It is the cross section diagram which shows the example of execution form of the
speaker device of this invention.
[0091]
Explanation of sign
[0092]
1. Shield cover and yoke, 2, 37. Yoke, 3, 6, 38. Ring magnet 4, 7, 39, 25a, 25b .. Plate, 5, 8, 22,
36 .. Magnetic gap , 9. Frame, 10. Main diaphragm, 13, 35, 41 1. Voice coil bobbin, 14. Voice
coil, 20. Diaphragm for high sound, 21. Flat voice coil, 23. Magnet, 24a, 24b .... Plate shaped yoke
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