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JP2001333492

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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
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DESCRIPTION JP2001333492
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
ribbon speaker, and more particularly to the structure of a ribbon speaker having ultrahigh
frequency characteristics corresponding to the required frequency characteristics in DVD audio.
[0002]
2. Description of the Related Art DVD audio has been put to practical use as a new music optical
disc to be replaced with the current CD (Compact Disc). In general, audio data recorded on a CD
is audio data quantized at a resolution of 16 bits and having a maximum sampling frequency of
44.1 kHz. CDs have the advantage of being more convenient to handle and store than previous
analog records, but are said to be inferior to analog records in terms of sound quality. In fact, the
audible range of human beings can be 20 kHz or more, and the dynamic range also needs to be
120 dB or more. DVD audio, on the other hand, uses the same linear PCM encoding method as
current CDs, but with a maximum sampling frequency of 192 kHz and resolution increased to 24
bits, response frequency bands up to 96 kHz The dynamic range of 120 dB can be maintained
within.
[0003]
In a reproduction apparatus for reproducing DVD audio, not only the frequency characteristic of
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an amplifier as a circuit system is extended to a very high frequency to take advantage of DVD
audio, but also a speaker as an acoustic system is required to have a characteristic corresponding
thereto. As well known, the speakers include a woofer responsible for low / mid-range playback
and a tweeter responsible for high-range playback, but in order to bring out the advantages of
DVD audio, the tweeter characteristics are improved, that is, the tweeter The high frequency
band is important.
[0004]
In general, an electrodynamic cone speaker has a disk-shaped bottom yoke formed of a magnetic
metal member having a cylindrical pole portion at the center, on which an annular magnet is
mounted to form a magnetic circuit, A coil bobbin obtained by winding a voice coil fixed at the
center of a diaphragm suspended by an edge and a damper on a frame is inserted into a pole
portion constituting a magnetic circuit. Then, when a drive current is supplied to the voice coil,
the diaphragm vibrates in the front-rear direction of the speaker, and the electric signal is
converted into air vibration (acoustic signal). The response characteristics of the speaker are
largely influenced by the size and material of the diaphragm and the damper material used to fix
the diaphragm to the frame. In particular, the high frequency speaker can not be coped with by
the structure in which the diaphragm holds the damper.
[0005]
In order to vibrate the diaphragm at a high frequency, it is necessary to reduce the weight of the
diaphragm itself, but the damper, the voice coil, the coil bobbin, and the like become components
that inhibit the weight reduction of the diaphragm. There is a ribbon speaker as a speaker for
high frequency which solved these.
[0006]
In the ribbon speaker, as shown in FIG. 11, the ribbon 3 formed of metal foil is placed in the
magnetic field by the N pole and the S pole of the two magnetic poles 1 and 2, and the ribbon 3
is supplied by supplying a current directly to the ribbon 3 A speaker according to Fleming's lefthand rule generates a force 3 and vibrates the ribbon 3 according to a drive current. That is,
since the ribbon itself has the functions of the diaphragm and the voice coil, the ribbon speaker
does not require a coil bobbin, and the diaphragm can be reduced in size and weight, which is
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suitable for a high frequency speaker.
[0007]
In the ribbon speaker, since the ribbon 3 is disposed adjacent to the two magnetic poles 1 and 2,
the gel is formed in the gap between the both sides of the ribbon 3 and the adjacent magnetic
poles 1 and 2 as shown in FIG. The support and movement range of the ribbon 3 are regulated
by injecting and bonding the silicon 4 and using the hardened silicon 4 as a damper material.
However, since the characteristics of the ribbon speaker having such a structure differ depending
on the amount of silicon 4 and the position where it is fixed, high precision work is required in
the sealing step of silicon 4, reliability and yield are poor, and manufacturing cost is high. Was a
factor that
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above
problems, and an object thereof is to be able to accurately regulate the moving range of a ribbon
diaphragm with a simple configuration, and to reduce the manufacturing cost. It is in providing
the ribbon speaker which can be restrained.
[0009]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, in the ribbon
speaker according to the invention of claim 1, both ends of the ribbon diaphragm are fixed to a
support plate, and air permeability is provided on both sides of the support plate. It arranges and
comprises a pair of braking materials which it has.
[0010]
A ribbon speaker according to the invention described in claim 2 is the ribbon speaker according
to claim 1, wherein the damping material is made of non-woven fabric.
[0011]
The ribbon speaker according to the third aspect of the present invention is the ribbon speaker
according to the first or second aspect, wherein the damping material is disposed so as to be in
contact with the ribbon diaphragm.
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[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the main part structure of a
ribbon speaker according to an embodiment of the present invention will be described below
based on FIG.
1 and 2 are diagrams showing a support mechanism of the ribbon diaphragm, and FIG. 1 is a
plan view of the ribbon diaphragm support mechanism in a state where a part of the damping
material 14 described later is removed. 2 shows a side view of the ribbon diaphragm support
mechanism.
[0013]
The ribbon diaphragm support mechanism 20 according to the embodiment of the present
invention is disposed with a gap from the support plate 11 formed of an aluminum flat plate
provided with a square hole 10 at the center and the long side inner peripheral edge portion 10 a
of the square hole 10. The ribbon diaphragm 13 to which the lead wire 12 for supplying the
drive current is supplied at both ends is soldered, and the air permeability is good in a cloth form
without weaving the fibers on both surfaces of the support plate 11 so as to cover the ribbon
diaphragm 13 The damping material 14 formed of non-woven fabric is disposed.
The non-woven fabric in the present embodiment is made of nylon, and has a thickness of 0.16
mm and a basis weight of 20 g square meter.
[0014]
Next, the detailed structure of the support plate 11 and the ribbon diaphragm 13 will be
described with reference to FIGS.
3 and 4 are structural views of the support plate 11, FIG. 3 shows a plan view of the support
plate 11, and FIG. 4 shows a partially enlarged view of the support plate 11. As shown in FIG.
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5 and 6 are structural views of the ribbon diaphragm 13. FIG. 5 shows a plan view of the ribbon
diaphragm 13 and FIG. 6 shows a side view of the ribbon diaphragm 13. As shown in FIG.
[0015]
The support plate 11 for supporting the ribbon diaphragm 13 is a rectangular aluminum flat
plate with a thickness of about 0.3 mm provided with an insulating film by alumite treatment, as
shown in FIGS. 3 and 4. A rectangular hole 10 having a short side 10b for housing approximately
4.8 mm is formed, and an adhesive 11a is applied to one surface, and the separator 11b protects
the adhesive 11a.
[0016]
Further, the ribbon diaphragm 13 is a strip-like aluminum foil having a width of about 4.2 mm
and a thickness of about 9 ?m, and the rectangular shape of the support plate 11 is obtained by
using a rolling jig (not shown) As shown in FIGS. 5 and 6, a mountain-shaped uneven portion 13b
is formed at a central portion in the portion positioned in the hole 10, and is positioned inside
the short side 10b of the rectangular hole 10 on both sides of the ribbon diaphragm 13. The Ushaped bending part 13c is formed in the part to be.
The concavo-convex portion 13 b of the ribbon diaphragm 13 is provided to be lower than the
thickness of the support plate 11 to form a vibrator portion 13 d which prevents the waviness of
the ribbon diaphragm 13 in the rectangular hole 10 and increases the strength. The flexure 13 c
has an edge function to facilitate the vibration of the ribbon diaphragm 13 in the square hole 10.
[0017]
Next, a method of assembling the ribbon diaphragm supporting mechanism 20 according to the
present embodiment will be described with reference to FIGS. FIG. 7 is an enlarged perspective
view of a part of the ribbon diaphragm support mechanism 20, showing the structure of the
support plate 11, the ribbon diaphragm 13, and the positional relationship of the damping
member 14 in an easy-to-understand manner.
[0018]
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First, the separator 11b of the support plate 11 is peeled off, the strip ribbon diaphragm 13 is
placed on the support plate 11 coated with the adhesive material 11a, and both fixing parts 13a
of the ribbon diaphragm 13 are stuck on the support plate 11. wear. At this time, the ribbon
diaphragm 13 is disposed so as to be positioned at the center of the short side 10 b of the square
hole 10 of the support plate 11, thereby providing a gap from the long side inner peripheral
portion 10 a of the square hole 10. . The fixed portion 13a of the ribbon diaphragm 13
protruding outside the support plate 24 is cut.
[0019]
Next, in order to solder the lead wires 12 to both fixing portions 13a of the ribbon diaphragm 13,
preliminary soldering with aluminum solder is performed at a predetermined position. Then, the
lead wire 12 is placed on the pre-soldered ribbon diaphragm 13, fixed by the adhesive 11 a, and
then soldered to the ribbon diaphragm 13. As described above, since the insulating film is formed
on the surface of the support plate 11 by alumite treatment, the drive current is supplied only to
the ribbon diaphragm 13 through the lead wire 12.
[0020]
Next, the support plate 11 and the ribbon diaphragm 13 fixed to the support plate 11 are
mounted on a rolling jig. The rolling jig rolls the vibrating portion 13d and the bending portion
13b by the concavo-convex portion 13a as shown in FIG. 3 with respect to the portion of the
ribbon diaphragm 13 disposed in the rectangular hole 10 of the support plate 11. As a result, the
vibrating portion 13 d of the ribbon diaphragm 13 is supported in a state of being
accommodated in the rectangular hole 10 of the support plate 11. Thereafter, the damping
material 14 formed of a non-woven fabric having air permeability is attached onto the adhesive
material 11 a of the support plate 11. Finally, the damping material 14 is fixed to the other
surface of the support plate 11 using, for example, a double-sided tape or the like, and the
assembly work of the ribbon diaphragm support mechanism 20 is finished.
[0021]
As described above, the ribbon diaphragm supporting mechanism 20 of the present embodiment
forms the vibrating portion 13 d and the bending portion 13 b by using a rolling jig after the
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ribbon diaphragm 13 is fixed to the rectangular hole 10 of the support plate 11. Because of this,
highly accurate work becomes possible, and stable characteristics are obtained by making the
shapes of the vibrating portion 13d and the bending portion 13b uniform and making the gap
between the vibrating portion 13d and the long side inner peripheral portion 10a uniform. Thus,
the reliability and the yield can be improved, and the manufacturing cost can be reduced. In
addition, since structural uniformity is possible, it is possible to obtain a ribbon speaker that is
lighter in weight by using thinner aluminum foil and has excellent ultra-high frequency
characteristics.
[0022]
Further, according to the present embodiment, since the damping member 14 is provided on the
support plate 11 so as to sandwich the ribbon diaphragm 13, the moving range of the vibrating
portion 13d can be accurately regulated. Further, by using a non-woven fabric as the damping
material 14, the fibers of the non-woven fabric can be configured to be slightly in contact with
the surface of the vibrating portion 13d, so within the predetermined frequency band due to the
size and shape of the vibrating portion 13d. It is possible to suppress the occurrence of the
parasitic vibration that occurs. Next, a structure and an assembling method of the tweeter 50
using the ribbon diaphragm supporting mechanism 20 of the present embodiment will be
described with reference to FIGS. FIG. 8 is a perspective view of the tweeter 50, and FIG. 9 is a
cross-sectional view of the tweeter 50. As shown in FIG.
[0023]
The tweeter 50 includes a rectangular magnet 22 disposed at the center of the bottom case 21
and a pair of L-shaped magnets disposed on the left and right sides of the magnet 22 to form a
predetermined magnetic gap G on the top surface side of the magnet 22. Similar to the inner
yoke 23, the ribbon diaphragm support mechanism 20 of the present embodiment mounted so
as to cover the magnetic gap G of the inner yoke 23, and the inner yoke 23, it contacts the inner
yoke 23 to form the magnetic gap G. A pair of L-shaped outer yokes 24 arranged as described
above and a front case 26 in which a rectangular opening 25 is formed at the center.
[0024]
The tweeter 50 fixes the magnet 22 at the center of the bottom case 21 with an adhesive or the
like at the time of assembly, and then arranges the pair of internal yokes 23 on both sides of the
magnet 22.
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Next, the ribbon speaker 20 is placed on the magnetic gap G formed by the pair of internal yokes
23. Then, a pair of outer yokes 24 is inserted into the gap between the bottom case 21 and the
inner yoke 23, the ribbon diaphragm supporting mechanism 20 is sandwiched between the inner
yoke 23 and the magnetic gap G of the outer yoke 24, and the lead wire 12 is externally
provided. In the pulled-out state, the front case 26 is covered from above and fixed to the bottom
case 21 with a screw or the like (not shown) to complete the assembly.
[0025]
Next, the operation of the tweeter 50 will be described with reference to FIG. 10 is a partially
enlarged view of the cross-sectional view of the tweeter 50 shown in FIG.
[0026]
As shown in FIG. 10, the ribbon diaphragm supporting mechanism 20 is fixed between the inner
yoke 23 and the outer yoke 24, and the ribbon diaphragm 13 is disposed substantially at the
center of the magnetic gap G of the inner yoke 23 and the outer yoke 24. Ru.
[0027]
Now, it is assumed that the magnetic poles N and the magnetic poles S of the inner yoke 23 and
the outer yoke 24 are arranged as shown in the figure, and magnetic flux is formed in the
direction shown by the dotted arrow in the figure.
If the drive current is supplied from the lead wire 12 and the drive current flowing from the front
of the paper to the back of the paper flows in the ribbon diaphragm 13, the vibrating portion 13
d of the ribbon diaphragm 13 is indicated by an arrow F in FIG. It is driven in the direction
shown. Further, assuming that a drive current flowing from the back of the paper surface to the
front of the paper surface flows through the ribbon diaphragm 13, the vibrating portion 13d of
the ribbon diaphragm 13 is driven in the opposite direction to the arrow F in the drawing. That
is, the ribbon diaphragm 13 is driven according to the drive current supplied to the lead wire 12,
and the electrical signal is converted into an acoustic signal, and the sound is output from the
opening 25 of the front case 26.
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[0028]
As described above, since the ribbon speaker according to the embodiment of the present
invention is used by being sandwiched between the inner yoke 23 and the outer yoke 24 when
configuring the tweeter 50, the tweeter 50 having high magnetic flux efficiency and high
efficiency is configured. However, the present invention is not limited to this. For example, the
same effect can be obtained by using only the inner yoke 23. Moreover, although it comprised
using the nonwoven fabric as a damping material, if it is the fiber excellent in air permeability, it
will not be limited to a nonwoven fabric.
[0029]
According to the present invention, the moving range of the ribbon can be accurately regulated
with a simple configuration, and a ribbon speaker excellent in manufacturing cost can be
obtained.
[0030]
Brief description of the drawings
[0031]
1 is a plan view of a ribbon diaphragm support mechanism according to an embodiment of the
present invention.
[0032]
2 is a side view of a ribbon diaphragm support mechanism according to an embodiment of the
present invention.
[0033]
3 is a plan view of a support plate constituting the ribbon speaker of the present embodiment.
[0034]
4 is a side view of a support plate constituting the ribbon speaker of the present embodiment.
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[0035]
5 is a plan view of a ribbon diaphragm constituting the ribbon speaker of the present
embodiment.
[0036]
6 is a side view of a ribbon diaphragm constituting the ribbon speaker of the present
embodiment.
[0037]
7 is a perspective view enlarging a part of the ribbon diaphragm support mechanism of the
present embodiment.
[0038]
8 is a perspective view of a ribbon tweeter configured using the ribbon diaphragm support
mechanism of the present embodiment.
[0039]
9 is a cross-sectional view of a ribbon tweeter configured using the ribbon diaphragm support
mechanism of the present embodiment.
[0040]
10 is an operation explanatory view of a ribbon tweeter using the ribbon speaker of the present
embodiment.
[0041]
11 is an operation principle diagram of the ribbon speaker.
[0042]
12 is a configuration diagram of a ribbon speaker in the conventional example.
[0043]
Explanation of sign
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[0044]
10 иии Square hole 11 и и и Support plate 12 и и Lead wire 13 и и Ribbon diaphragm 14 и и Damping
material 20 и и Ribbon diaphragm support mechanism
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