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JP2006013571

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DESCRIPTION JP2006013571
PROBLEM TO BE SOLVED: To provide a speaker unit and a speaker system capable of expanding
a reproduction band in bass with one speaker unit. SOLUTION: A diaphragm 17 is fixed to a first
voice coil bobbin 16 in which two large and small magnetic gaps X and Y are arranged
concentrically and arranged in a small diameter magnetic gap X to form a first vibration system.
The second voice coil bobbin 20 disposed in the magnetic gap Y of the diameter is fixed to the
damper or coupler whose outer peripheral portion is fixed to the frame to form a second
vibration system, and the lower portion of the second voice coil bobbin is fixed to the damper 22
The first and second voice coil bobbins 16 and 20 are mutually connected by the connecting
member 23 to match the mechanical impedances of the first vibration system and the second
vibration system, or the first and second The speeds of vertical movement of the voice coil
bobbin are made substantially the same, and the increase of the lowest resonance frequency and
the sharpness of resonance is suppressed to widen the bass band. [Selected figure] Figure 1
スピーカユニットおよびスピーカシステム
[0001]
The present invention relates to a speaker unit used for various audio devices and a speaker
system using the unit, and more specifically, a speaker unit capable of expanding a bass
reproduction band with one speaker And a speaker system using this speaker unit.
[0002]
In the conventional speaker system, the closed system which is one of the bass reproduction
systems has the lowest resonance frequency of the speaker system because the pressure of air
applied to the back of the diaphragm of the speaker is added as stiffness equivalently acting as
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an air spring. However, it has been considerably higher than the lowest resonance frequency of
the speaker unit itself to be used, and it has been difficult to extend the reproduction band with
bass.
[0003]
Therefore, as one of the measures for suppressing the increase of the lowest resonance
frequency of the speaker system and expanding the bass reproduction band, for example, in JPA-8-79886 (patent document 1) etc., it corresponds to the spring of the speaker unit. There is
disclosed a speaker (so-called damperless speaker) having no damper, which reduces stiffness
and suppresses the increase of the lowest resonance frequency and widens the bass reproduction
band by eliminating the dampers.
[0004]
In the "new version, speaker & enclosure encyclopedia" (non-patent document 1) and the like, the
first speaker used to radiate the sound to the outside and the first speaker provided to the
partition plate provided inside the cabinet A so-called double drive type speaker system is
disclosed in which a second speaker is provided to control the movement of the speaker and the
bass reproduction band is expanded.
[0005]
More specifically, for example, as shown in FIG. 9, this double drive type speaker system is used
to radiate sound to the outside of the air chamber A formed in the cabinet D of the speaker
system 1. The first speaker 2 for front emission is provided, and the air chamber B formed by the
partition plate 3 on the back side of the first speaker 2 is affected by the pressure of air applied
to the back of the diaphragm of the first speaker. The second speaker 4 is provided so as to be
excluded.
That is, the second speaker 4 is configured to be controlled so that the pressure of air that
impedes the movement of the first speaker 2 is substantially zero, and apparently the first
speaker 2 is provided in the infinite baffle. Thus, the reproduction band can be expanded in low
tones.
[0006]
In the double drive type speaker system shown in FIG. 9, the vibration speed of the speaker is 1)
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the first speaker for front radiation provided in the air chamber A, V1, 2) for the auxiliary
provided in the air chamber B Let V2 be the second speaker, and 3) make the vibration area ratio
of the first speaker and the second speaker be n (where n = Sq2 / Sq1), and the pressure of air
applied to the back of the diaphragm of the first speaker If both volume velocities are equal so
that x becomes zero, then V1 = nV2, so the relationship between the impedances Z1 and Z2 of
both mechanical systems is to be determined as Z2 = n (F2 / F1) * Z1 Can.
[0007]
Under this condition, the impedance Z3 indicating stiffness equivalent to the pressure of air
applied to the back surface of the diaphragm of the first speaker in the mechanical simple
equivalent circuit is in the form of being eliminated in the above equation. Since Z3 becomes
irrelevant to the circuit and the circuit can be regarded as equivalent to a series circuit with Z3
removed, it becomes equivalent to a general closed cabinet.
(See Figure 10)
[0008]
Therefore, by setting and using two speakers so as to satisfy the above condition Z2 = n (F2 /
F1) * Z1 , the speaker that emits the sound has the stiffness of the back of the diaphragm. A
speaker system that is not affected is configured, the lowest resonance frequency never rises, and
the bass band is expanded.
JP-A-8-79886 (FIG. 1, Paragraph No. 0033) "A New Version of Speaker & Enclosure
Encyclopedia" (Seibundo Shinkosha) 1999, p. 118 and p.
105
[0009]
In order to reduce the influence of stiffness, the damperless speaker described in Patent
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Document 1 eliminates the damper, suppresses the increase of the lowest resonance frequency,
and realizes the expansion of the bass reproduction band.
However, since the damper for holding the voice coil accurately in the air gap is eliminated, the
voice coil is not accurately held in the air gap, and the voice coil causes rolling (rolling
phenomenon) when vibrating. The voice coil bobbin and the voice coil come in contact with the
components of the magnetic circuit, which has the disadvantage that they tend to cause defects
such as generation of abnormal noise and disconnection of the voice coil.
[0010]
Moreover, in order to prevent the voice coil from rolling, there is a measure to harden the edge,
but this method has a disadvantage that the lowest resonance frequency and the sharpness of the
resonance increase. Furthermore, there is also a method of preventing the voice coil bobbin or
the wire of the voice coil from contacting the components of the magnetic circuit by widening the
air gap of the magnetic circuit. However, there is a disadvantage that the magnetic flux density is
lowered by widening the air gap, and the sound pressure drop can not be avoided. Furthermore,
a resin film is formed on the side of the pole, and the dimensional relationship among the inner
diameter of the plate, the outer diameter of the pole, the inner diameter of the voice coil, and the
outer diameter of the voice coil is restricted. There is also a problem to be solved in the
manufacture of the speaker because the operation with which the damper-equipped speaker is
not added is added.
[0011]
On the other hand, as is clear from FIG. 9, the double drive type speaker system described in
Non-Patent Document 1 mentioned above includes a speaker unit for front emission (first
speaker) and an auxiliary speaker unit for enhancing bass (second (2) speaker unit is an
indispensable system, and furthermore, the air chamber of each speaker unit is required, so that
the structure becomes complicated, and the cost reduction or downsizing and / or thinning are
realized. It is difficult to map.
[0012]
In addition, as an operating condition of the double drive type speaker system, it is necessary to
make the volume speed of the speaker for the front radiation, which is the first speaker unit, and
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the volume speed of the auxiliary speaker, which is the second speaker unit, equal. .
However, the speaker unit has various unstable factors such as dimensional accuracy of
component parts, variations in initial physical properties of materials, temporal changes in
physical properties due to fatigue during vibration, and nonlinearity of vibration. Therefore,
changes in mechanical impedance can not be ignored, and matching the mechanical impedances
of the first and second speakers to make the volume velocity identical is extremely difficult, and
ideal low-pass characteristics Currently, it is difficult to obtain.
[0013]
As a method of solving the above-mentioned drawbacks, as disclosed in Non-Patent Document 1,
it flows to the voice coil of the first speaker by the MFB (motional feedback) method using the
second speaker on the back side for control. There is a technology that detects the speed
component from the current and drives the second speaker via the control circuit, in which the
two speakers operate at the same phase and volume speed, but the speed detection circuit
Special electrical circuits such as control circuits are required, and it is difficult to reduce costs.
[0014]
In view of such a present situation, the present invention does not use an auxiliary speaker unit,
and does not provide a plurality of air chambers or new electric circuits in a cabinet, but uses a
single speaker unit while using a damper. It is an object of the present invention to provide a
speaker unit and a speaker system capable of expanding a reproduction band in low tones.
[0015]
In order to achieve the above object, the invention according to claim 1 of the present invention
is as follows: Two magnetic gaps of different diameter are arranged concentrically, and the upper
part of the first voice coil bobbin arranged in the small diameter magnetic gap The central
portion of the diaphragm having the outer peripheral portion fixed to the frame via the edge is
fixed to form a first vibration system, and the outer peripheral portion is formed on the upper
portion of the second voice coil bobbin disposed in the large diameter magnetic gap The inner
periphery of the damper or coupler fixed to is fixed to form a second vibration system, and the
lower part of the second voice coil bobbin is fixed to the inner periphery of the damper whose
outer peripheral part is fixed to the frame, The first and second voice coil bobbins are connected
to each other by a connecting material, and by matching the mechanical impedance of the first
vibration system and the second vibration system, Alternatively, by making the moving speeds of
the first and second voice coil bobbins substantially the same, it is characterized in that the rising
of the lowest resonance frequency and the resonance sharpness is suppressed and the bass band
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is expanded. It is a speaker unit.
[0016]
The invention according to claim 2 of this invention is the speaker unit according to claim 1,
wherein the small-diameter magnetic gap is a cylindrical center pole provided on the top surface
of a bottom yoke having a required diameter, and It is formed between the outer periphery of the
pole piece and the inner periphery of the center pole of a cylindrical magnet disposed in the
center pole and a first magnetic circuit formed of the pole piece disposed on the magnet. It is
characterized by
[0017]
The invention according to claim 3 of the present invention is the speaker unit according to claim
1, wherein the large-diameter magnetic gap is a cylindrical center pole provided on the top
surface of a bottom yoke having a required diameter. An inner periphery of the top plate and a
center pole of a ring-shaped magnet disposed on the bottom yoke on the outer periphery of the
center pole, and a second magnetic circuit formed of the top plate disposed on the magnet It is
characterized in that it is formed between the outer periphery and the outer periphery.
[0018]
The invention according to claim 4 of this invention is the speaker unit according to claim 1,
wherein the connecting member holds the first voice coil bobbin and the second voice coil
bobbin in common. It is characterized by being a single flexible damper.
[0019]
The invention according to claim 5 of the present invention is characterized in that, in the
speaker unit according to claim 1, the connecting material is formed of a material having rigidity.
[0020]
Furthermore, the invention according to claim 6 of the present invention is a speaker system in
which the speaker unit according to any one of claims 1 to 5 is mounted on a cabinet of a closed
system.
[0021]
In the speaker unit according to the present invention, two magnetic gaps having different
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diameters are arranged concentrically, the first vibration system is provided in the small diameter
magnetic gap, and the second vibration system is provided in the large diameter magnetic gap.
Since the first voice coil bobbin which is respectively disposed and which constitutes the first
vibration system and the second voice coil bobbin which constitutes the second vibration system
are mutually connected by the connecting member, the first vibration is formed. By matching the
mechanical impedance of the system with the second vibration system, or by making the speeds
of the first and second voice coil bobbins to be substantially the same, the lowest resonance
frequency and the sharpness of the resonance Can suppress the rise of and expand the bass
band.
[0022]
Further, in the speaker system according to the present invention, the increase of the lowest
resonance frequency and the sharpness of resonance can be suppressed and the bass band can
be expanded by a very simple and easy means of mounting one speaker unit having the above
configuration to a cabinet. The system structure is simple, the system can be miniaturized, and
the product cost can be reduced.
[0023]
Hereinafter, an embodiment of a speaker unit according to the present invention will be
specifically described. FIG. 1 is a cross-sectional view showing an example of the speaker unit
according to the present invention, and FIG. 2 is a circuit diagram showing a mechanical
equivalent circuit of FIG. 3 is a schematic explanatory view showing an example of a speaker
system using the speaker unit according to the present invention, FIG. 4 is a circuit diagram
showing a mechanical equivalent circuit of the speaker system shown in FIG. 3, and FIG. 5 is a
speaker unit according to the present invention 6 is a circuit diagram showing the mechanical
equivalent circuit of FIG. 5, FIG. 7 is an explanatory view of a conventional damperless speaker
system, and FIG. 8 is a mechanical equivalent circuit of FIG. It is a circuit diagram.
9 is a schematic explanatory view of a double drive type speaker system, and FIG. 10 shows a
mechanical equivalent circuit of FIG.
[0024]
A speaker unit according to the present invention has a first vibration system in which two
magnetic gaps having different diameters are arranged concentrically, and a first voice coil
bobbin joined to a diaphragm is arranged in one small diameter magnetic gap. The second voice
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coil bobbin not joined to the diaphragm is disposed in the other large diameter magnetic gap to
form a second vibration system, and the voice coil bobbins are interconnected by a connecting
member. Thus, various changes can be made without departing from the scope of the present
invention, and the present invention is not limited to the examples described below.
[0025]
The speaker unit 10 shown in FIG. 1 has two magnetic gaps X and Y with different diameters
concentrically formed on a bottom yoke 12 of a required diameter provided with a cylindrical
center pole 11 having a required diameter at the center of the upper surface Specifically, the first
magnet of the inner magnet type is formed of a cylindrical magnet 13 fixed on the bottom of the
bottom yoke 12 and a pole piece 14 fixed on the magnet 13. In the first magnetic circuit, a gap
formed between an outer peripheral portion of the pole piece 14 and an inner peripheral portion
of the cylindrical pole piece 11 in the first magnetic circuit is a magnetic gap X.
[0026]
In the magnetic gap Y, a ring-shaped magnet 14 is fixed on the bottom yoke 12, and a ringshaped top plate 15 is fixed on the top thereof to constitute an external magnetic second
magnetic circuit. This second magnetic circuit is formed between the outer peripheral portion of
the center pole 11 and the inner peripheral portion of the top plate 15.
[0027]
Then, the first voice coil bobbin 16 on which the voice coil x is mounted is disposed in the
magnetic gap X having a small diameter, and the central portion of the diaphragm 17 is fixed to
the upper outer peripheral portion thereof to configure a first vibration system. The outer
peripheral portion of the diaphragm 17 is fixed to the outer periphery of the opening of the
frame 19 fixed to the top plate 15 through the edge 18.
[0028]
Further, the second voice coil bobbin 20 mounted with the voice coil y is disposed in the
magnetic gap Y having a large diameter, and the lower outer peripheral portion is fixed to the
frame 19 by the damper 21 whose upper outer peripheral portion is fixed to the frame 19 The
second vibration system is configured by being held by the damper 22, and the first voice coil
bobbin 16 and the second voice coil bobbin 20 are linked by a connecting member 23.
[0029]
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The connecting member 23 has a function of holding the first voice coil bobbin 16 accurately in
the magnetic gap X of the first magnetic circuit, as is apparent from FIG. 1. The lower portion of
the second voice coil bobbin 20 The damper 22 is substantially the same as the damper 22
supporting the outer peripheral portion, and is made of a lightweight flexible material such as
cotton or chemical fiber with low density.
In addition, even if it forms integrally with the said damper 22, it is also possible to form
separately with a homogeneous material.
[0030]
In FIG. 1, 24 is a dust cap, 25 is a gasket, 26 is a lead wire connecting the first voice coil x and
the input terminal 27, and 28 is a lead connecting the second voice coil y and the input terminal
29. An electrical input is applied in parallel to the input terminals 27 and 29 by lines.
[0031]
Hereinafter, the operation of the speaker unit 10 having the above configuration will be
described using a mechanical equivalent circuit.
The mechanical equivalent circuit of this speaker unit 10 is, as shown in FIG. 2, composed of a
first voice coil x, a first voice coil bobbin 16, a diaphragm 17, an edge 18, a dust cap 24, and a
lead 26. The second vibration system (hereinafter, referred to as the first vibration system
(hereinafter, referred to as vibration system 1), the second voice coil y, the second voice coil
bobbin 20, the dampers 21, 22 and the lead wire 28 The reactance is inserted in parallel
between the vibration system 1 and the vibration system 2 due to the stiffness S3 ′ given by the
coupling member 23 that mechanically couples the vibration system 2).
[0032]
FIG. 4 shows a mechanical equivalent circuit of the speaker system when the above speaker unit
10 is attached to the cabinet C of a closed system as shown in FIG.
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When the speaker unit 10 is placed in a closed cabinet C, the reactance due to the volume of air
inside the cabinet C and the stiffness Sb ′ determined from the effective vibration area of the
vibration system 1 is in series with respect to the mechanical impedance of the vibration system
1 It becomes a form that is newly inserted.
[0033]
The reason is that the pressure due to the elasticity of the air inside the cabinet C is applied to
each of the vibration surfaces of the edge 18 of the vibration system 1, the diaphragm 17 and
the dust cap 24, so the stiffness of the edge 18 of the vibration system 1 becomes stronger. To
show the same action as
In addition, since the dampers 21 and 22 of the vibration system 2 have air permeability, the
effective vibration area can be ignored, and therefore the dampers 21 and 22 are not influenced
by the stiffness Sb '.
That is, in the mechanical equivalent circuit, the stiffness Sb 'does not exist in the closed path of
the vibration system 2.
[0034]
Therefore, assuming that the vibration velocity of the vibration system 1 is V1 ′ and the
vibration velocity V2 ′ of the vibration system 2 is V1 ′ = V2 ′ as in the conventional double
drive speaker system, Z2 ′ = (F2 It becomes' / F1 ') * Z1' and becomes an expression which does
not include Z3.
Then, in order to make this equation hold for any numerical value, the equation may be an
identity equation for ω (angular frequency), and coefficients may be made equal for the same
order of both sides.
[0035]
Accordingly, the relational expressions for each of equivalent resistance, equivalent stiffness, and
equivalent mass are as follows.
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[0036]
[0037]
[0038]
[0039]
In the above formulae, each symbol has the following meaning.
R1 '; equivalent resistance of vibration system 1 R2'; equivalent resistance of vibration system 2
M1 '; equivalent mass of vibration system 1 M2'; equivalent mass of vibration system 2 S1 '(=
Se'); equivalent stiffness of vibration system 1 S2 '(= Sb'); equivalent stiffness of vibration system
2 S1 ′ ′; sum of stiffness of edge and internal volume of cabinet
[0040]
Under the conditions under which the above relation holds, the stiffness S3 'becomes irrelevant
to the circuit, so that the circuit can be regarded as a series circuit from which the stiffness S3' is
removed, and the mechanical equivalent circuit of the closed speaker system It becomes
equivalent.
[0041]
Next, the lowest resonance frequencies of the conventional damperless speaker system and the
speaker system of the present invention (Example 1) are compared as follows.
In the case of a conventional sealed speaker system equipped with damperless speakers (see FIG.
8)
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[0042]
Where F0: lowest resonance frequency Se; edge stiffness Sb; cabinet internal volume stiffness M;
equivalent mass
[0043]
In the case of a closed type speaker system equipped with the speaker of Example 1 (see FIG. 4)
[0044]
However, F0 ′; minimum resonance frequency S1 ′ ′ sum of stiffness of edge and cabinet
internal volume S2 ′; sum of two damper stiffnesses of vibration system 2 M1 ′; equivalent
mass of vibration system 1 M2 ′; vibration system 2 Equivalent mass
[0045]
Then, substituting (2) and (3) into (5) and deleting S1 ′ ′, S2 ′ and M2 ′, the equation (4)
can be modified as follows.
[0046]
[0047]
Further, comparison of the sharpness of resonance between the conventional damperless
speaker system and the speaker system of the present invention (Example 1) is as follows.
In the case of a conventional sealed speaker system equipped with damperless speakers (see FIG.
8)
[0048]
However, Qo; resonance sharpness Se; edge stiffness Sb; cabinet internal volume stiffness M;
equivalent mass R; equivalent resistance
[0049]
In the case of a closed type speaker system equipped with the speaker of Example 1 (see FIG. 4)
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[0050]
However, Qo ′ resonance sharpness S1 ′ ′ sum of stiffness of edge and cabinet internal
volume S2 ′; sum of two damper stiffnesses of vibration system 2 M1 ′; equivalent mass of
vibration system 1 M2 ′; vibration system 2 Equivalent mass of R1 '; equivalent resistance of
vibration system 1 R2'; equivalent resistance of vibration system 2
[0051]
Then, substituting (1), (2) and (3) into (8) and deleting R2 ', S1 ", S2' and M2 ', equation (8) can
be modified as follows.
[0052]
[0053]
Therefore, under the condition that the vibration speeds of the vibration system 1 and the
vibration system 2 are equal, the equation (6) has the same form as the equation (4).
And Formula (9) becomes the same form as Formula (7).
Here, since the damper stiffness does not exist in the equations (6) and (9), it can be derived that
the lowest resonance frequency and the sharpness of the resonance do not depend on the
(apparently) damper stiffness.
Then, it can be said that Example 1 apparently has the same operation as when the damperless
speaker is mounted and driven in the closed cabinet, so the stiffness is small compared to a
general speaker system using a damper. Thus, it is possible to obtain the effect that the increase
of the lowest resonance frequency and the increase in resonance sharpness can be suppressed,
and the bass band can be expanded.
[0054]
The speaker unit 30 shown in FIG. 5 shows another embodiment of the speaker unit according to
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the present invention, and basically has the same configuration as that of the first embodiment
described above. , Only the differences will be described.
[0055]
That is, in the speaker unit 30, the upper outer peripheral portion of the second voice coil bobbin
20 constituting the second vibration system is connected to the coupler 31 whose other end is
fixed to the frame 19 via the edge 18, A connecting member 23 interconnecting the first voice
coil bobbin 16 and the second voice coil bobbin 20 is made of a rigid material such as hard
plastic or metal, and the first vibration system and the second vibration system are connected.
The vibration velocity is configured to be forced to be the same.
[0056]
As described above, by replacing the material of the connecting member 23 with a rigid body
such as hard plastic or aluminum, the first vibration system and the second vibration system
vibrate together as a first vibration system. Since the conditions under which the second
vibration system has the same vibration velocity are obtained, as in the case of the first
embodiment, it is possible to suppress the rise of the lowest resonance frequency and the
sharpness of the resonance, and obtain the effect of expanding the bass band. .
[0057]
Considering the mechanical system simple equivalent circuit in this case, since the first vibration
system and the second vibration system move at the same speed as a rigid body, they become
irrelevant to the stiffness S3 ′ and the reactances contained in parallel are released from the
circuit It can be regarded as equivalent to the above and, as can be seen from the mechanical
system simplified equivalent circuit shown in FIG.
[0058]
And, in the low frequency band, all equivalent resistances, all equivalent masses, and all
equivalent stiffnesses in the circuit can be regarded as lumped constants of one element
respectively, so that the vibration form is a forced vibration system of a substantially simple one
degree of freedom system As a result, in the low-range sound pressure characteristic near the
lowest resonance frequency, a characteristic with few inflection points and little unevenness can
be easily obtained.
[0059]
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Further, since the first vibration system and the second vibration system are structurally linked
by the rigid connecting member 23, the total equivalent resistance, total equivalent mass, total
number of total of the vibration system 1 and the vibration system 2 are combined. The
equivalent stiffness and the total driving force can be regarded as apparently or virtually
distributed to the vibration system 1 ′ and the vibration system 2 ′ in equal proportions,
respectively.
In other words, by matching the mechanical impedances of the apparent vibration system 1 'and
the vibration system 2', it can be rephrased that the respective vibration speeds become the same
as a result.
[0060]
Therefore, the mechanical impedances of the apparent vibration system 1 ′ and the vibration
system 2 ′ are not influenced by the restriction of matching the mechanical impedance of the
vibration system 1 with the mechanical impedance of the vibration system 2 as in the
conventional double drive speaker. And the vibration speeds of the vibration system 1 and the
vibration system 2 can be made identical.
[0061]
That is, in the case of a speaker system having a high equivalent stiffness S1 ′ ′ value, which is
the sum of the edge of the vibration system 1 and the stiffness of the internal volume of the
cabinet, eg, a small speaker system, the vibration system is the conventional double drive speaker
system. In order to match the mechanical impedance of the vibration system 2 with that of the
vibration system 2, for example, under the condition of F1 ′ = F2 ′, the value of the equivalent
stiffness S2 ′ of the damper of the vibration system 2 is equal to the value of S1 ′ ′ of the
vibration system 1 Due to the need to increase the value must be increased.
However, in the second embodiment, since there is no restriction that the equivalent stiffness S2
'of the vibration system 2 is made equal to the equivalent stiffness S1 "of the vibration system 1,
the equivalent stiffness S2' is free regardless of the value of the equivalent stiffness S1"
Therefore, if the S2 'value is set low, it is possible to suppress the rise of the lowest resonance
frequency and the sharpness of the resonance, and it is possible to expand the bass band.
01-05-2019
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[0062]
It is a sectional view showing an example of a speaker unit concerning this invention.
It is a circuit diagram which shows the mechanical system equivalent circuit of FIG.
It is a schematic explanatory drawing which shows an example of the speaker system which uses
the speaker unit concerning this invention.
FIG. 6 is a circuit diagram showing a mechanical equivalent circuit of the speaker system shown
in FIG. 3;
It is sectional drawing which shows the other example of the speaker unit concerning this
invention.
FIG. 6 is a circuit diagram showing a mechanical equivalent circuit of FIG. 5;
It is explanatory drawing of the conventional damperless speaker system.
FIG. 8 is a circuit diagram showing a mechanical equivalent circuit of FIG. 7;
It is a schematic explanatory drawing of the speaker system of the conventional double drive
system.
The mechanical system equivalent circuit of FIG. 9 is shown.
Explanation of sign
[0063]
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DESCRIPTION OF SYMBOLS 10 Speaker unit 11 Cylindrical center pole 12 Bottom yoke 13
Column-shaped magnet 14 Ring-shaped magnet 15 Top plate 16 1st voice coil bobbin 17
diaphragm 18 edge 19 frame 20 2nd voice coil bobbin 21, 22 Damper 23 connection Material X
Small magnetic gap Y Large diameter Magnetic gap x, y Voice coil
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