close

Вход

Забыли?

вход по аккаунту

?

JP2000333293

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2000333293
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
wide reproduction band speaker capable of reproducing up to an ultra high frequency band up
to, for example, 70 kHz.
[0002]
2. Description of the Related Art In general, a voice coil is attached to the inner periphery of a
diaphragm made of one cone paper, and a voice coil is wound on the voice coil bobbin, and the
voice coil is inserted into a magnetic gap. It is very difficult to reproduce (radiate) the super high
frequency range even with a small aperture, for example, a 39 mm aperture full band speaker,
and even in this speaker, the frequency of the 40 kHz is also large because the weight of the
voice coil is large. The reproduction up to was at best.
[0003]
In view of the foregoing, the present invention proposes a cone-shaped speaker capable of
reproducing, for example, an ultra high frequency band up to 70 kHz.
[0004]
SUMMARY OF THE INVENTION In the speaker according to the present invention, a voice coil is
attached to the inner periphery of a cone-shaped diaphragm and a voice coil is wound around the
voice coil bobbin, and the voice coil is inserted into a magnetic gap. In the speaker, the voice coil
bobbin is formed of a conductive material and a gap extending in the longitudinal direction is
08-05-2019
1
provided in the voice coil bobbin to form a one-turn voice coil, and the voice coil is fixed to the
voice coil bobbin with a soft adhesive. A high frequency signal is supplied to the one-turn voice
coil composed of the voice coil bobbin.
[0005]
According to the present invention, the voice coil bobbin is used as a voice coil of one turn, and
the high frequency signal is supplied and the voice coil is fixed to the voice coil bobbin by a soft
adhesive. The adhesion by the soft adhesive is reduced, and the voice coil bobbin and the voice
coil are separated. The voice coil bobbin functions as a voice coil for one turn, and only the very
light voice coil bobbin vibrates. The mass of the voice coil before being separated from the voice
coil bobbin is lost, and the difference in the mass makes it possible to reproduce, for example, an
ultra high frequency band up to 70 kHz.
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIGS. 1 and 2, an
embodiment of the loudspeaker according to the invention will be described.
[0007]
In the example of FIG. 2, the ring-shaped magnet 2 in which the N pole and the S pole are
magnetized in the thickness direction on the bottom 1a of the wedge-shaped shield cover 1 of a
predetermined size Adhesively fix as it abuts on 1a.
In this case, the ring-shaped magnet 2 is positioned by the magnet guide 1 b provided on the
bottom 1 a of the wedge-shaped shield cover 1.
[0008]
A yoke 3 in which a center pole 3a and a flange 3b are integrally formed on the S pole of the ring
magnet 2 is fixed so that the bottom of the flange 3b of the yoke 3 abuts.
[0009]
The ring-shaped magnet 4 having the N pole and the S pole magnetized in the thickness direction
08-05-2019
2
on the flange 3 b of the yoke 3 is adhered and fixed so that the S pole abuts on the flange 3 b of
the yoke 3.
In this case, the ring-shaped magnet 4 is positioned such that the center pole 3 a of the yoke 3
penetrates and the ring-shaped magnet 4 is positioned by the magnet guide 3 c provided on the
flange 3 b of the yoke 3.
[0010]
A ring-shaped plate 5 is bonded and fixed onto the N pole of the ring-shaped magnet 4 and a
magnetic gap 6 is formed between the inner peripheral surface of the plate 5 and the outer
peripheral surface of the center pole 3a.
[0011]
In this case, the ring-shaped magnets 2 and 4 are magnetized in opposite directions, and the ringshaped magnet 2 forms a cancel magnet and covers the outer periphery of the ring-shaped
magnets 2 and 4 by the wedge-shaped shield cover 1. To make a magnetically shielded speaker.
[0012]
The speaker frame 7 is attached to the upper surface of the plate 5, and the outer peripheral
portion of the cone-shaped diaphragm 8 provided with the edge 9 on the outer periphery is held
by the gasket 10 on the outer peripheral portion of the frame 7.
[0013]
On the other hand, the voice coil bobbin 11 is attached to the inner peripheral portion of the
diaphragm 8, and the voice coil 12 is wound and adhesively fixed to the voice coil bobbin 11, and
the voice coil 12 is centered on the inner peripheral surface of the plate 5 and the yoke 3. It is
inserted into the magnetic gap 6 formed between the outer peripheral surfaces of 3a.
[0014]
In this embodiment, as shown in FIG. 1, the voice coil bobbin 11 is formed of a conductive
material such as an aluminum thin plate, and the voice coil bobbin 11 is provided with a gap 11a
extending in the longitudinal direction to serve as a nonconductive portion. Is a voice coil of one
turn, input terminals 11b and 11c are provided at one end and the other end of the voice coil 11,
08-05-2019
3
and high frequency signals of acoustic signals are supplied to the input terminals 11b and 11c.
11d and 11e are lead wires from the input terminals 11b and 11c, respectively.
[0015]
For example, a reinforcing paper 13 for reinforcing the voice coil bobbin 11 is wound around the
outer periphery of the voice coil bobbin 11 made of an aluminum thin plate, and the voice coil
12 is wound around the voice coil bobbin 11 and fixed by bonding.
In FIG. 1, reference numerals 12 a and 12 b denote voice coil lead wires for supplying an
acoustic signal of the voice coil 12.
[0016]
In this example, a soft adhesive is used as an adhesive for bonding and fixing the voice coil 12 to
the voice coil bobbin 11.
As this soft adhesive, for example, an alcohol reactivating adhesive such as lock varnish is used.
[0017]
Further, in the example of FIG. 2, the voice coil 12 is held by the damper 14 in the magnetic gap
6.
As the damper 14, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
Further, a cap 15 for preventing dust intrusion is provided so as to cover the upper surface of the
voice coil bobbin 11.
08-05-2019
4
[0018]
Further, input terminals 16a and 16b are provided at predetermined positions of the frame 6 of
the speaker, and an acoustic signal supplied to the input terminal 16a is supplied to the voice coil
12 through the tinsel wire 17a and supplied to the input terminal 16b. The high frequency signal
of the sound signal is supplied to the voice coil of one turn composed of the voice coil bobbin 11
through the tinsel wire 17b.
[0019]
In this example, when the acoustic signal 21 is supplied to the voice coil of one turn consisting of
the voice coil 12 and the voice coil bobbin 11, as shown in FIG. 3, the voice of one turn consisting
of the voice coil bobbin in series with the voice coil 12. A coil 11 is connected, and a high-pass
capacitor 22 is connected in parallel to the voice coil 12. An acoustic signal 21 is transmitted to a
series circuit of a voice coil 11 consisting of a parallel circuit of the voice coil 12 and the
capacitor 22 and a voice coil bobbin. To supply
[0020]
In this case, although the voice coil 11 of one turn has a very small resistance value, when the
voice coil 11 of one turn is connected in series to the voice coil 12, a matching transformer for
matching the impedance can be omitted.
[0021]
Further, by connecting the capacitor 22 in parallel to the voice coil 12, as shown in FIG. 4, the
impedance of the voice coil 12 can be reduced, and the current input to the voice coil 11 of one
turn can be increased. The driving force of the voice coil 11 can be increased.
[0022]
For example, in a speaker of 8 ohms, it is about 30 ohms at 20 kHz, so it will be about 150 ohms
at 100 kHz, but connect a capacitor 22 in parallel with this voice coil 12 so that the synthetic
impedance at 100 kHz becomes 6 ohms Then, the impedance of the voice coil 12 can be set to 6
ohms / 150 ohms = 1/25.
When the impedance at 100 kHz of the one-turn voice coil 11 is, for example, 2 ohms, the
08-05-2019
5
impedance of the series circuit of the parallel circuit of the voice coil 12 and the capacitor 22 and
the one-turn voice coil 11 can be 8 ohms.
[0023]
At this time, the current flowing through the voice coil 11 of one turn is (150 ohms +2 ohms) / (6
ohms +2 ohms) = 19 times, and the driving power of the voice coil 11 of this one turn is
increased by 19 times the current The sound pressure at 100 kHz in the superhigh range can be
improved substantially by about 25 dB.
In other words, even if the sound pressure is lowered by about 25 dB, it can be made flat sound
pressure.
[0024]
Thus, in the speaker of FIG. 2, the magnetic flux from the N pole of the ring magnet 4 is the N
pole of the ring magnet 4 → plate 5 → magnetic air gap 6 → center pole 3a of the yoke 3 →
flange 3b → ring magnet It flows in the magnetic circuit of 4 south poles.
[0025]
Therefore, when an acoustic signal is supplied to the voice coil 12 from the input terminal 16a,
the voice coil 12 is driven according to this acoustic signal to drive the diaphragm 8.
In this case, the drive of the diaphragm 8 by the voice coil 12 is up to about 40 kHz.
[0026]
In this example, the voice coil bobbin 11 is made of, for example, a conductive material made of
an aluminum thin plate, and a high frequency signal of an acoustic signal is supplied as a voice
coil of one turn. Since 12 is fixed, for example, in the super high frequency range of 40 kHz or
more, the adhesion by this soft adhesive decreases, and the voice coil bobbin 11 and the voice
coil 12 become separated, and in this case, The voice coil bobbin 11 works as a voice coil for one
turn, and the diaphragm 8 is vibrated only by the very lightweight voice coil bobbin 11. The mass
of the voice coil 12 before being separated from the voice coil bobbin 11 is lost. The sound
08-05-2019
6
pressure level as shown in FIG. It can be obtained a speaker capable of reproducing up to the
ultra high range up as example 70kHz shown in wave number characteristics.
[0027]
FIG. 6 shows an example of a phase-reversal speaker apparatus in which a speaker of a wide
reproduction band capable of reproducing up to an ultra high frequency band up to, for example,
70 kHz as shown in FIG. 2 is attached to a small speaker box 30.
Referring to FIG. 6, in FIG. 6, a speaker sound emission hole 31a is formed in a baffle plate 31
provided on the front surface of the speaker box 30 which is formed into a substantially
rectangular box shape by ABS resin or the like. Fix the speaker as shown in FIG.
[0028]
Further, an acoustic signal is supplied from the input terminal 32 provided at a predetermined
position outside the speaker box 30 to the input terminals 16a and 16b of the speaker through
the connection lines 33, 34 and 35, and the acoustic signal from the input terminal 16a Is
supplied to the voice coil 12 through the tinsel wire 17a, and a high frequency signal of the
acoustic signal obtained at the input terminal 16b is supplied to the one-turn voice coil of the
voice coil bobbin 11 through the tinsel wire 17b. It does like that.
[0029]
Further, a duct 36 having an opening 36a is provided on the same surface of the speaker sound
emission hole 31a of the baffle plate 31, and the phase of the sound emitted from the back
surface of the diaphragm 8 of the speaker is inverted. Make it radiate outside.
[0030]
In this case, the phase of the sound emitted from the rear surface of the diaphragm 8 of the
speaker is inverted and radiated from the duct 36 to the outside of the speaker box 30, and the
low frequency range of the sound emitted from the front surface of the diaphragm 8 is expanded.
doing.
[0031]
According to the speaker device according to the present example, it is possible to obtain a small-
08-05-2019
7
sized speaker device having a wide reproduction band which can reproduce up to, for example,
an ultra high frequency band up to 70 kHz.
[0032]
FIGS. 7, 8 and 9 show other examples of the voice coil 12 and the voice coil bobbin 11,
respectively.
The parts corresponding to FIG. 1 will be assigned the same reference numerals as in FIG. 7, FIG.
8 and FIG. 9, and the detailed description thereof will be omitted.
[0033]
Also in the example shown in FIG. 7, the voice coil bobbin 11 is formed of a conductive material
such as an aluminum thin plate, and the voice coil bobbin 11 is provided with a gap 11a
extending in the longitudinal direction to serve as a nonconductive portion. A coil is provided,
and input terminals 11b and 11c are provided at one end and the other end of the voice coil 11,
and high frequency signals of acoustic signals are supplied to the input terminals 11b and 11c.
[0034]
For example, a reinforcing paper 13 for reinforcing the voice coil bobbin 11 is wound around the
outer periphery of the voice coil bobbin 11 made of an aluminum thin plate, and the voice coil
12 is wound around the voice coil bobbin 11 and fixed by bonding.
[0035]
Also in the example of FIG. 7, a soft adhesive is used as an adhesive for bonding and fixing the
voice coil 12 to the voice coil bobbin 11.
As this soft adhesive, for example, an alcohol reactivating adhesive such as lock varnish is used.
In this example of FIG. 7, three input terminals are provided on the frame 7 of the speaker, and
the other ends of the three tinsel cords 40, 41 and 42 whose one ends are respectively
08-05-2019
8
connected to the three input terminals are placed on the reinforcing paper 13. The end of the
lead 12a of the voice coil 12 is soldered and fixed to the other end of the tinsel cord 40, and the
end of the lead 12b of the voice coil 12 is fixed to the other end of the tinsel cord 41. The other
end of the lead 11e soldered and fixed at one end to the input terminal 11c of the voice coil
consisting of the voice coil bobbin 11 is soldered and fixed to the other end of the tinsel wire 42
The other end of the lead wire 11 d fixed by soldering one end to the input terminal 11 b of the
voice coil made up of the coil bobbin 11 is soldered and fixed to the other end of the tinsel wire
41.
[0036]
In this case, the connection relationship between the voice coil 12 and the one-turn voice coil
composed of the voice coil bobbin 11 is as shown in FIG.
[0037]
Further, in the example of FIG. 8, in the example of FIG. 7, two input terminals are provided on
the frame 7 of the speaker, and the other ends of two tinsel cords 43 and 44 whose one ends are
respectively connected to the two input terminals The adhesive wire is fixed on the reinforcing
paper 13 and the end of the winding start leader 12a of the voice coil 12 is soldered and fixed to
the other end of the tinsel wire 43, and the end of the leader 12b of the winding end of the voice
coil 12 Is connected to one of the input terminals 11b of the one-turn voice coil consisting of the
voice coil bobbin 11, and the other end of the lead 11e is soldered to the other input terminal
11c of the voice coil 11 by soldering. Solder and fix to the other end of.
[0038]
Also in this example of FIG. 8, the connection relationship of the one-turn voice coil composed of
the voice coil 12 and the voice coil bobbin 11 is as shown in FIG.
Others are configured in the same manner as in FIG.
[0039]
In the example of FIG. 9, four input terminals are provided on the frame 7 of the speaker, and the
other ends of the four tinsel cords 45, 46, 47 and 48 whose one ends are respectively connected
to the four input terminals are respectively reinforced The voice coil 12 is bonded and fixed to
the other end of the voice coil 12 and the other end of the voice coil 12 is connected to the other
08-05-2019
9
end of the tinsel wire 45 and 46, respectively. The input terminals 11b and 11c of the voice coil
of one turn are connected respectively.
[0040]
In this case, the connection relationship between the voice coil 12 and the one-turn voice coil
composed of the voice coil bobbin 11 is as shown in FIG.
Others are configured in the same manner as in FIG.
[0041]
The present invention is not limited to the above-described example, and it goes without saying
that various other configurations can be adopted without departing from the scope of the present
invention.
[0042]
According to the present invention, the voice coil bobbin is made of a conductive material made
of, for example, an aluminum thin plate, and a high-pass signal of an acoustic signal is supplied
as a one turn voice coil and a soft adhesive is applied to the voice coil bobbin. Since the voice coil
is fixed by this, for example, in the super high frequency band of 40 kHz or more, the adhesive
force by this soft adhesive decreases, and the voice coil bobbin and the voice coil become
separated, and in this case, The voice coil bobbin acts as a one-turn voice coil, and the diaphragm
is vibrated only by the very light weight voice coil bobbin. The mass of the voice coil before
separation from the voice coil bobbin is reduced. Due to the difference, for example, it is possible
to reproduce a super high frequency range up to 70 kHz. Mosquitoes can be obtained.
08-05-2019
10
Документ
Категория
Без категории
Просмотров
0
Размер файла
18 Кб
Теги
jp2000333293
1/--страниц
Пожаловаться на содержимое документа