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JP2003299191

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2003299191
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
low frequency dedicated speaker used to perform high quality music reproduction and a method
of manufacturing the same.
[0002]
2. Description of the Related Art In recent years, high-quality music sources have been developed
with the rapid development of digital media, and the reproduction of bass has been required
more than ever. In addition, there is a great need for deep bass reproduction, as there are multichannel dedicated low-pass channels.
[0003]
Generally, as shown in FIG. 9, a speaker system exclusively for heavy bass reproduction has a
large aperture speaker 1 in a large cabinet 2 and a high output for limiting the output signal of a
music source 5 such as a CD player to a low frequency range. A method has been adopted in
which the signal is limited to only the low band by the band cut filter 4 and the power is
amplified and driven by the power amplifier 3 exclusively for the low band. However, in this
method, although the mid-high range signal does not enter the speaker 1 itself, the non-linearity
of the speaker 1 (the distortion of the driving force received by the voice coil) etc. is output as
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reproduced sound. There is a disadvantage that the high frequency cut filter 4 has to be inserted
in order to limit the signal to be caused to only the low band.
[0004]
It is proposed in FIG. 10 to improve this and give the speaker itself a high cut structure so that
non-linear distortion of the driving force and an amplifier for driving the speaker do not require a
high frequency cut filter. Reference numeral 6 is a magnetic circuit configured to generate
magnetic energy in the annular magnetic gap 7. Reference numeral 8 is a voice coil for
generating a driving force by fitting the annular portion into the magnetic gap 7. Reference
numeral 9 denotes a diaphragm It is. The diaphragm 9 has three parts: a part having a material
and structure with excellent flexibility in the inner peripheral part 10, a part having a high
rigidity in the middle part 11, and a material and a structure with excellent flexibility in the outer
peripheral part 12. It consists of
[0005]
Reference numeral 13 is a damper for supporting the voice coil 8. Reference numeral 14 is a
second diaphragm called a dust cap joined to the rigid portion of the middle portion 11 of the
diaphragm 9. Reference numeral 15 is a frame for supporting these whole components is there.
[0006]
Next, the operation will be described based on FIG.
The voice coil 8 for generating the driving force is joined to the inner circumferential portion 10
having the material and the structure of the diaphragm 9 which is excellent in flexibility, but the
inner circumferential portion 10 having the material and the structure is excellent The vibration
is transmitted to the rigid middle portion 11 of the diaphragm 9 to emit sound. At this time, while
the vibration is transmitted through the portion having the material and structure excellent in
flexibility shown by the inner circumferential portion 10, the high frequency portion of the
vibration becomes difficult to be transmitted, and the rigidity of the middle portion 11 of the
diaphragm 9 Only the low frequency part of the vibration is transmitted to the high part.
[0007]
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Therefore, high frequency components are cut and acoustic radiation of only low frequency
components is performed. In order to explain this quantitatively, an electroacoustic equivalent
circuit of the speaker shown in FIG. 10 is shown in FIG. Here, Rdm is a mechanical resistance
generated when the voice coil 8 vibrates, Rde is an electromagnetic braking resistance based on a
back electromotive force generated by the voice coil 8 vibrating in the magnetic gap 7, and Mv is
the mass of the voice coil 8 And Cv is the compliance of the damper 13 joined to the voice coil 8.
Cc is the compliance of the portion of the inner peripheral portion 10 of the diaphragm 9 with
the material and structure with excellent flexibility, and Rc is the mechanical resistance of this
portion. Mm is the effective vibrating mass of the diaphragm 9, and Cm is the compliance of the
portion of the outer peripheral portion 12 of the diaphragm 9 with a material and structure
excellent in flexibility. Fd is a driving force generated in the voice coil 8, Vv represents the
velocity of the voice coil 8, and Vm represents the velocity of the diaphragm 9.
[0008]
The sound pressure frequency characteristic radiated by calculating this electroacoustic
equivalent circuit and determining Vm is determined by the following equation.
[0009]
Sound pressure SPL is SPL = 94 + 20 Log (π × f × ρ0 × (ad 2 × Vm)) (1) where f is the
frequency, ρ 0 is the density of air, and ad is the effective vibration radius of the diaphragm. The
sound pressure frequency characteristics calculated by equation (1) are shown by putting values
into the parameters of the electroacoustic equivalent circuit shown in FIG.
As can be understood from this characteristic, it is understood that the high-cut side shows the
characteristic of high cut which is cut off at -12 dB / oct.
[0010]
As described above, the speaker shown in FIG. 10 incorporates a mechanism for cutting the high
region in the structure of the speaker, and the voice coil has a merit that the high frequency cut
filter is unnecessary for the amplifier for driving the speaker. The harmonic component
generated by the distortion of the driving force is blocked by the high cut mechanism of the
speaker, and the distortion is reduced.
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[0011]
However, in the structure shown in FIG. 10, the upper portion of the voice coil 8 is connected to
the inner peripheral portion 10 having the material and the structure with excellent flexibility of
the diaphragm 9. Where it should only move up and down exactly, it tends to induce lateral
movement called rolling.
Due to this, when a large input is applied to the speaker, this rolling phenomenon becomes large,
and the voice coil 8 hits a portion called inner and outer peripheral plates constituting the
magnetic gap 7 and an abnormal sound and, in some cases, an annular portion of the voice coil 8
Problems such as breakage of the speaker and the like.
[0012]
As described above, the conventional speaker has an excellent high-cut mechanism, and a lowfrequency dedicated speaker can be constructed with a simple configuration that does not
require a high-frequency cut filter in the amplifier. There is a problem of lack of stability at large
input.
[0013]
An object of the present invention is to provide a low-pass dedicated speaker that has excellent
high-cut characteristics similar to a conventional speaker, prevents lateral movement of a voice
coil even at a large input, and can perform stable operation. .
[0014]
SUMMARY OF THE INVENTION In order to solve the above problems, the loudspeaker according
to the present invention comprises a magnetic circuit having an annular magnetic gap, a frame
coupled to the magnetic circuit, an outer peripheral portion and an inner peripheral portion. The
first diaphragm, whose middle part is made of a highly flexible material and whose rigidity is
high, and whose outer peripheral part is connected to the peripheral part of the frame, is
connected to the peripheral part of this first diaphragm and the magnetism A voice coil fitted in
the magnetic gap of the circuit, and a slide which is engaged with the bearing provided at the
center of the magnetic circuit coupled to the upper part of the voice coil to move the first
diaphragm and voice coil only up and down A moving body and a second diaphragm coupled so
as to cover at least the inner periphery of the first diaphragm. With this structure, the vibration
from the voice coil is generated at the inner periphery of the diaphragm. Flexible material The
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high frequency is cut off at the configured part, and the lateral movement is restricted by the
sliding of the voice coil from the upper end of the voice coil from being caught in the bearing, so
that the rolling phenomenon is prevented. Stable operation is possible.
[0015]
In the speaker according to the present invention, the magnetic circuit having an annular
magnetic gap, the frame coupled to the magnetic circuit, the outer peripheral portion and the
inner peripheral portion are materials with high flexibility, and the middle portion is a material
with high rigidity. A first diaphragm configured and having an outer peripheral portion coupled
to the peripheral portion of the frame, a voice coil coupled to the inner peripheral portion of the
first diaphragm and fitted in the magnetic gap of the magnetic circuit, and the voice coil A sliding
body coupled to the upper portion of the magnetic circuit and fitted in a bearing provided at the
center of the magnetic circuit to move the first diaphragm and voice coil only in the vertical
direction, and at least the inner peripheral portion of the first diaphragm And a second
diaphragm coupled so as to cover the first and second diaphragms, wherein the wire ring of the
voice coil is formed of two independent wire rings.
[0016]
With this structure, the vibration from the voice coil is cut off in the high region at the portion of
the inner peripheral portion of the diaphragm made of the highly flexible material, and the
movement of the voice coil slides from the upper end of the voice coil. Since the lateral
movement is restricted by the moving part getting stuck in the bearing, the rolling phenomenon
is prevented and stable operation is possible, and in the case of a general low-pass woofer, a
stereo amplifier is used using a dedicated amplifier. Is amplified and driven, but this
configuration makes it possible to directly input the output signals of the left and right speakers
of a stereo to the speakers, and an amplifier dedicated to low frequencies as in the prior art can
be used. It can be omitted.
[0017]
DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) The first embodiment of
the present invention will be described below with reference to the drawings.
[0018]
FIG. 1 is a cross-sectional view showing the configuration of the loudspeaker in accordance with
the first exemplary embodiment of the present invention.
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A magnetic circuit 15 is composed of a plate 28 with a center pole 26 configured to generate
magnetic energy in the annular magnetic gap 16, a magnet 29, and an upper plate 30. A ring
portion 17 is fitted in the magnetic gap 16. A voice coil is incorporated to generate a driving
force, and 18 is a first diaphragm.
The first diaphragm 18 is composed of a portion of the inner peripheral portion 19 made of a
material and structure excellent in flexibility, a portion of a high rigidity of the middle portion 20
and a material and structure excellent in flexibility of the outer peripheral portion 21. The upper
portion of the voice coil 17 is joined to the highly flexible portion of the inner peripheral portion
19 of the first diaphragm 18.
[0019]
The high rigidity portion of the middle portion 20 of the first diaphragm 18 is usually made of
paper or the like, but the structure made of metal, resin, graphite and their composite material is
more rigid than paper. It can be high and is advantageous for the loudspeaker of the invention.
[0020]
22 is a damper for supporting the voice coil 17, 23 is a second diaphragm referred to as a dust
cap joined to the first diaphragm 18, and 24 is a frame for supporting the whole.
Reference numeral 25 denotes a bearing formed on the center pole 26 of the magnetic circuit 15
so that the axial direction is perpendicular to the concentric surface of the annular magnetic gap
16. Reference numeral 27 denotes a sliding body coupled to the upper end of the voice coil 17,
This is stuck in the bearing 25.
[0021]
Based on this, the operation will be described.
The electro-acoustic equivalent circuit of this speaker is basically the same as that shown in FIG.
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11, but the difference is that in FIG. 11, the mass of the voice coil 8 is represented as Mv. The
first embodiment is different from the first embodiment only in that the mass of the sliding
member 27 is added to the mass of the voice coil 17 as Mv.
Therefore, the mechanism for blocking the high frequency band is the same as described above
and will be omitted.
[0022]
On the other hand, in terms of operational stability, the sliding member 27 joined to the upper
end of the voice coil 17 of FIG. 1 slides in a bearing 25 whose axial direction is perpendicular to
the concentric surface of the annular magnetic gap 16 By doing this, the lateral vibration of the
voice coil 17 is suppressed within the range of the gap (clearance) between the bearing 25 and
the sliding member 27, and it vibrates up and down in the magnetic gap 16 accurately.
At this time, the clearance between the bearing 25 and the sliding member 27 is smaller than the
clearance between the wire ring portion of the voice coil 17 and the upper plate 30 forming the
magnetic gap 16 and the portion called the center pole 26. Set to a value.
[0023]
As a result, the voice coil 17 does not contact the upper plate 30 and the center pole 26
constituting the magnetic gap 16, and phenomena such as abnormal noise and destruction of the
voice coil 17 are not generated, and high frequency components in the speaker structure It is
possible to realize a low-range dedicated speaker that is provided with a blocking mechanism and
has high operation stability.
[0024]
It should be added that the sliding noise generated by the sliding member 27 moving up and
down in the bearing 25 is also significantly reduced by the high frequency cutoff mechanism of
the speaker.
[0025]
In addition, various structures can be considered as a highly flexible structure of the inner
peripheral portion 19 of the diaphragm 18, but by using a cloth material as shown in FIG. The
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parameters such as the compliance component and the mechanical resistance component can be
easily controlled by the selection of the cloth material and the resin, and the characteristics of the
speaker can be easily controlled.
[0026]
Second Embodiment FIG. 3 is a cross-sectional view showing the structure of a loudspeaker
according to a second embodiment of the present invention.
The basic structure is the same as that shown in FIG. 1, but in the second embodiment, the wire
ring of the voice coil 17 comprises two independent wire rings 17a and 17b.
FIG. 4 shows the structure of the voice coil 17 in detail, but two looped wires 17a and 17b
having two sets of inputs are overlapped and wound so as to be able to receive two inputs. .
[0027]
The blocking mechanism of the high band and the stabilization mechanism of the operation are
omitted because they are the same as those described in the first embodiment, but by making the
voice coil 17 accept two inputs in this way, As shown in FIG. 5, the outputs from the power
amplifier 32 for inputting the music source 31 such as a CD player to the left and right speakers
33 and 34 are respectively branched, and each output is shown in the second embodiment of the
present invention. By adding to two inputs of the speaker 35, it is possible to construct a socalled 3D system in which a deep bass can be enhanced without requiring a dedicated amplifier
and filter (network).
[0028]
(Embodiment 3) Next, a method of manufacturing a speaker according to the present invention
will be described.
[0029]
6 (a) to 6 (j) are explanatory views showing Embodiment 3 of the speaker manufacturing method
of the present invention.
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[0030]
36 is an assembly of the damper 22 and the voice coil 17, and 37 is a spacer.
Reference numeral 38 denotes an assembly in which the frame 24 is connected to the magnetic
circuit 15, and reference numeral 18 denotes a first diaphragm.
27 is a sliding body, and 23 is a second diaphragm.
[0031]
First, as shown in FIG. 6A, the voice coil 17 and the damper 22 are assembled in advance so that
the wire ring portion of the voice coil 17 fits in the position of the annular magnetic gap 16 of
the magnetic circuit 15.
Then, as shown in FIG. 6 (b), a spacer 37 is used to couple to an assembly 38 in which the frame
24 is coupled to the magnetic circuit 15.
The reason for using the spacer 37 is the center pole 26 and the upper portion which constitute
the magnetic gap 16 of the assembly 38 in which the frame 24 is coupled to the inner periphery
of the voice coil 17 of the assembly 22 of the damper 22 and voice coil 17 and the magnetic
circuit 15 An appropriate gap is secured between the plate 30 and the outer peripheral portion
so that the voice coil 17 can vibrate back and forth smoothly in the magnetic gap 16.
[0032]
Subsequently, as shown in FIGS. 6C and 6D, the inner peripheral portion 19 of the first
diaphragm 18 is coupled to the upper portion of the voice coil 17, and the outer peripheral
portion 21 is coupled to the outer peripheral portion of the frame 24.
[0033]
Subsequently, as shown in FIGS. 6 (e) and 6 (f), the spacer 37 is removed, and as shown in FIG. 6
(g), the sliding member 27 is incorporated in the bearing 25 provided at the center of the
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magnetic circuit 15. The upper part is coupled to the upper part of the voice coil 17 as shown in
h).
[0034]
Then, as shown in FIGS. 6 (i) and 6 (j), the second diaphragm 23 is coupled to the central portion
20 of the first diaphragm 18, and the speaker of the present invention can be manufactured.
[0035]
(Fourth Embodiment) FIGS. 7A to 7F are explanatory views showing a fourth embodiment of the
speaker manufacturing method of the present invention.
[0036]
The reference numeral 39 is an assembly of the damper 22 and the voice coil 17, but the sliding
body 27 is incorporated in the upper part, and the reference numeral 38 is a combination of the
magnetic circuit 15 and the frame 24.
18 is a first diaphragm and 23 is a second diaphragm.
[0037]
First, as shown in FIG. 7A, in the one 39 in which the slider 22 is incorporated in the upper part
of the damper 22 and the voice coil 17 assembled, the wire ring portion of the voice coil 17 is an
annular magnetic gap of the magnetic circuit 15. When the sliding member 27 is fitted into the
bearing 25 provided at the central portion of the magnetic circuit 16 so as to be fitted in 16, the
inner and outer peripheral portion of the voice coil 17, the center pole 26 of the magnetic gap 16
and the upper plate 30 It is pre-assembled to have a suitable gap between.
This is assembled as shown in FIG. 7B into an assembly 38 in which the magnetic circuit 15 and
the frame 24 are connected.
[0038]
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Next, as shown in FIGS. 7 (c) and 7 (d), the outer peripheral portion 19 of the first diaphragm 18
with the damper 22 and the voice coil 17 assembled is assembled with the sliding body 27 at the
top. Combine section 21 with frame 24.
[0039]
Next, as shown in FIGS. 7 (e) and 7 (f), the second diaphragm 23 is coupled to the central portion
20 of the first diaphragm 18 so that the speaker of the present invention can be manufactured.
[0040]
This manufacturing method does not require the spacer 37 shown in the third embodiment, and
has an advantage that the manufacturing process can be simplified.
[0041]
(Fifth Embodiment) FIGS. 8A to 8D are explanatory views showing a fifth embodiment of the
loudspeaker manufacturing method of the present invention.
[0042]
39 is an assembly of the damper 22 and the voice coil 17, but the sliding body 27 is
incorporated in the upper part, and 19 corresponds to the inner periphery of the first diaphragm
18 made of a highly flexible material. is there.
Reference numeral 38 denotes a combination of the magnetic circuit 15 and the frame 24.
Reference numeral 40 denotes an intermediate portion 20 of the first diaphragm 18 and the
second diaphragm 23, which are integrally formed.
[0043]
First, in the assembly 39 of the damper 22 and the voice coil 17 assembled as shown in FIG. 8A,
the slide ring 27 is incorporated in the upper part of the voice coil 17 in the annular magnetic
gap 16 of the magnetic circuit 15. The center pole 25 and the upper plate 30 of the inner and
outer circumferences of the voice coil 17 and the inner and outer circumferences of the magnetic
gap 16 when the sliding body 27 is fitted in the bearing 25 provided at the central portion of the
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magnetic circuit 15. Of the first diaphragm, which corresponds to the inner periphery 19 of the
first diaphragm made of a highly flexible material.
These assemblies are coupled to an assembly 38 in which the magnetic circuit 15 and the frame
24 are coupled as shown in FIG. 8 (b).
[0044]
Next, as shown in FIGS. 8 (c) and 8 (d), an outer peripheral portion 21 of one obtained by
integrally forming the middle portion 20 of the first diaphragm 18 and the second diaphragm 23
with the frame 24 is The periphery is connected to the inner periphery 19 made of a highly
flexible material previously connected to the voice coil 17, which makes it possible to
manufacture the loudspeaker according to the invention.
[0045]
This manufacturing method has an advantage that the manufacturing process can be further
shortened than the method shown in the fourth embodiment, as well as the spacer 37 is not
required as in the method shown in the fourth embodiment.
[0046]
As described above, according to the speaker according to the present invention, it becomes
possible to realize a speaker dedicated to the low frequency band which has excellent high
frequency cutoff characteristics, low distortion and stable operation.
[0047]
Further, according to the speaker according to the present invention, it is possible to
inexpensively realize a so-called 3D system for adding deep bass without adding a dedicated
power amplifier.
[0048]
Brief description of the drawings
[0049]
1 is a cross-sectional view of the speaker according to the first embodiment of the present
invention
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[0050]
Fig. 2 A plan view of the support of the inner periphery of the diaphragm formed by
impregnating the cloth material with resin
[0051]
3 is a cross-sectional view of the speaker according to the second embodiment of the present
invention
[0052]
4 is a cross-sectional view of the voice coil of the speaker according to the second embodiment of
the present invention
[0053]
5 is a block diagram of a 3D system using the speaker according to the second embodiment of
the present invention
[0054]
6 (a) to 6 (j) are explanatory diagrams showing manufacturing steps in the third embodiment of
the speaker according to the present invention
[0055]
7 (a) to 7 (f) are explanatory views showing manufacturing steps in the fourth embodiment of the
speaker according to the present invention
[0056]
8 (a) to 8 (d) are explanatory views showing manufacturing steps in the fifth embodiment of the
speaker according to the present invention
[0057]
Fig. 9 Configuration diagram of a typical bass-only speaker system
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[0058]
Fig. 10 Cross-sectional view of the conventional high-pass cutoff low-pass dedicated speaker
[0059]
Fig. 11 Electroacoustic equivalent circuit diagram of high frequency cutoff type low frequency
dedicated speaker
[0060]
Figure 12 Sound pressure frequency characteristics of high frequency cutoff type low frequency
dedicated speaker
[0061]
Explanation of sign
[0062]
DESCRIPTION OF SYMBOLS 15 Magnetic circuit 16 Magnetic gap 17 Voice coil 18 1st
diaphragm 19 Inner peripheral part 20 Middle part 21 Outer peripheral part 22 Damper 23 2nd
diaphragm 24 Frame 25 Bearing 27 Sliding body
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