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DESCRIPTION JP2007104526

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DESCRIPTION JP2007104526
An object of the present invention is to increase and output low range even if a speaker
enclosure is small. When the speaker 10 is driven, the vibration of the cone paper of the speaker
10 is transmitted to the air in the speaker enclosure 50, and the vibration of the air causes the
vibration portion 51a of the diaphragm 51 to vibrate. At this time, the diaphragm 51 that
vibrates in a state of being kept airtight at the edge 70 compresses or expands the air volume in
the speaker enclosure 50 when it vibrates. Therefore, in addition to the elasticity of the
diaphragm 51, the air spring of the speaker enclosure 50 also has a new resonance frequency
between the compliance and the equivalent mass of the diaphragm 51. As a result, a sound to be
reproduced centered on the resonance frequency of the diaphragm 51 is generated. [Selected
figure] Figure 2
スピーカシステム
[0001]
The present invention relates to the technology of a speaker system.
[0002]
Various types of speaker systems have been developed, and for example, those using a bass
reflex or a drone cone are representative thereof.
The bass reflex enhances the bass using Helmholtz resonance, and the drone cone mounts the
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speaker unit without a drive circuit, and enhances the bass utilizing resonance with air in the
volume of the enclosure.
[0003]
In the case of a bass reflex, if the volume of the enclosure is small, the resonance tube must be
small and elongated in order to lower the resonance frequency, the air resistance increases, the
bass enhancement function significantly decreases, and the resonance tube There is a problem
that a whistle like wind noise is generated because the velocity of the passing air becomes very
high.
[0004]
Also, in the case of a drone cone, its mass must be increased to lower the resonance frequency.
And in order to lower the resonance frequency, the compliance of the edge supporting the
diaphragm must be large, but in order to support the diaphragm having a large mass, the
elasticity and strength of the edge must be large, and the compliance It will be in contradiction
with In addition, it is difficult for heavy diaphragms to vibrate completely in parallel, and it is
likely to be accompanied by abnormal vibration called rolling or locking. This abnormal vibration
increases distortion and consumes unnecessary energy, which reduces the efficiency.
[0005]
In order to compensate the defect of the above-mentioned drone corn, for example, patent
documents 1 etc. are proposed. According to this method, rolling and locking can be prevented,
but since the weight of the diaphragm (flap) is supported by the edge provided around it, the
edge needs to have strength, and the braking effect There is a problem that the vibration Q
becomes smaller due to Japanese Patent Publication No. 2002-531036
[0006]
In order to solve the above problems, the present invention can output a sufficient bass
component even in a small size, and can prevent rolling and locking and can also increase the Q
of vibration of the diaphragm and the speaker Intended to provide an enclosure.
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[0007]
In the speaker system according to the present invention, a speaker enclosure surrounded by a
plurality of faces and the inside thereof is sealed, and a part of an outline of a virtual plane figure
surrounded by a line is a connection portion on one surface of the speaker enclosure A notched
portion cut along the contour, a sealing member for covering the notched portion and sealing the
inner space of the speaker enclosure, and a speaker provided on any surface of the speaker
enclosure The portion surrounded by the cutout portion is a diaphragm that can be elastically
vibrated with the vicinity of the connection portion as a fulcrum, and the portion surrounding the
diaphragm on the one surface is a peripheral portion. An airtight member is attached from the
diaphragm to the peripheral portion in a state that enables the vibration of the diaphragm to seal
the internal space. And wherein the Rukoto.
[0008]
In a preferred aspect of the present invention, the sealing member is a sheet-like member
provided along the contour direction, and the cross-sectional shape of the member is a line in a
cross section orthogonal to the contour direction of the notch. And a path along the line is longer
than the width of the cross section of the notch.
In a further preferred aspect of the present invention, the sealing member is attached from the
diaphragm to the peripheral portion on the front surface side or the inner space side of the one
surface.
Further, in another preferable aspect, the sealing member is attached from the diaphragm to the
peripheral portion so as to cross the cutout portion from the surface side of the one surface to
the internal space side.
[0009]
Further, in a further preferable aspect of the present invention, the sealing member has a linear
cross-sectional shape, and a path of the line changes in accordance with a distance from the
connecting portion. In a further preferred aspect, the sealing member has a curved portion in its
cross-sectional shape, and the thickness of the curved portion is thinner than that of the other
portion. Further, in a further preferred aspect, the sealing member is integrally molded with at
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least the one surface. Further, in a further preferable aspect, both end portions in the crosssectional direction of the sealing member are fixed to the diaphragm and the peripheral portion,
and an end portion fixed to the diaphragm is close to an edge of the diaphragm. It is
characterized by
[0010]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 is a perspective view showing an appearance of a speaker system according to
an embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a speaker
provided with a voice coil, a magnet and the like, and is attached to the front of the speaker
enclosure 50. The speaker enclosure 50 is a rectangular parallelepiped sealed enclosure, and is
formed of plate-like members (for example, wood, synthetic resin, metal, or a composite material
obtained by laminating them) on all six sides.
[0011]
As shown in FIG. 1, a speaker mounting hole is provided through the baffle plate 50a on the front
surface of the speaker enclosure 50, and the above-described speaker 10 is inserted into the
speaker mounting hole. In this case, the frame on the front of the speaker 10 is fixed to the baffle
plate 50a by a screw.
[0012]
A notch 60 cut into a U-shape is provided from the central portion to the lower portion of the
baffle plate 50a. In the present invention, the U-shaped cutout 60 is included in the following
concept. That is, on one surface of the speaker enclosure, a part of the outline of the virtual plane
figure surrounded by a line is a connection part, and the connection part is left as it is a cutout
cut out along the outline. If this concept is applied to a U-shape, a virtual plane figure in which a
part is a U-shape is assumed, and a portion other than the U-shape (the upper portion of the Ushape in FIG. By leaving the connection portion and cutting along the contour of the virtual plane
figure, a U-shaped notch 60 is formed. In the present embodiment, a U-shaped upper portion is a
connection portion 51c as indicated by a broken line in the figure.
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[0013]
The portion surrounded by the notch 60 becomes a vibrating plate 51 that can vibrate by
elasticity with the vicinity of the connection portion 51c as a fulcrum. That is, since the upper
connection portion 51c of the diaphragm 51 is integral with the baffle plate 50a, and the other
portions are separated from the baffle plate 50a by the U-shaped notch 60, the diaphragm 51
has its upper end It can vibrate freely in a fixed state. In the following, the lower part of the
diaphragm 51 is referred to as a vibrating portion 51a. Further, as shown in FIG. 2A, the
diaphragm 51 is formed to be thinner than the other portion of the baffle plate 50a.
[0014]
The diaphragm 51 (i.e., the baffle plate 50a) is formed of a member having acoustically sufficient
strength and elasticity. Here, "acoustically sufficient strength" means that it is impervious to air,
has a density sufficiently larger than air, and has strength and elasticity to generate sound waves
when vibrated. Also, the diaphragm 51 has a property of being able to block the sound wave to
some extent by itself. Further, the degree of “elasticity” is such that when the diaphragm 51 is
placed horizontally, it can support its own weight and keep it substantially horizontal. In order to
satisfy such characteristics, the diaphragm 51 (that is, the baffle plate 50a) is made of, for
example, a thin wooden plate, a thin synthetic resin, a metal plate, or a composite material
obtained by laminating them.
[0015]
(A) and (b) of FIG. 2 are a side cross sectional view and a cross sectional view of the same
embodiment, respectively. As shown in these figures, the notch 60 is covered from the inside of
the speaker enclosure 50 by an edge 70 having an arched cross section, whereby the airtightness
of the speaker enclosure 50 is maintained. FIG. 3 shows the back of the baffle plate 50a, with the
edge 70 covering the U-shaped cutout 60 along its shape, as shown.
[0016]
Since one side of the diaphragm 51 communicates with the baffle plate 50a and is a fixed end,
the diaphragm 51 itself has a support function. Therefore, the edge 70 does not have to support
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the weight of the diaphragm 51, and may have only the function of maintaining the airtightness.
Therefore, it is possible to use a soft material, and it is possible to create an easy moving
situation in which the vibration of the diaphragm 51 is not suppressed. In the present
embodiment, the edge 70 is a thin sheet-like member, and in the cross-sectional direction of the
notch 60, the shape of the edge 70 is linear, and the path of the line is larger than the width of
the cross section of the notch 60. It has become. Thereby, even if the vibration of the diaphragm
51 occurs, the edge 70 can absorb the vibration width and maintain the sealing of the speaker
enclosure.
[0017]
The cross-sectional shape of the edge 70 is arch-like, but the diameter thereof is a diameter
corresponding to the amplitude A1 at the lower end portion 51 b of the diaphragm 51. FIG. 2C
shows a diagram for explaining the vibration operation of the diaphragm 51. As shown in this
drawing, the amplitude of the vibration of the diaphragm 51 increases as the distance from the
connection portion 51c increases. That is, as shown in FIG. 2C, when the amplitude A1 of the
lower end portion 51b of the diaphragm 51 is compared with the amplitude A2 near the
connection portion 51c, A1> A2 holds. The edge 70 in the present embodiment has a diameter
corresponding to the maximum amplitude of the vibrating portion 51 a (the amplitude A 1 of the
lower end 51 b), and therefore, the vibration is not hindered at any position of the diaphragm 51.
[0018]
Further, as shown in FIG. 2B, the edge 70 is attached such that the attaching part 70 a is located
near the outer edge of the diaphragm 51. This configuration will be described below in
comparison with the example shown in FIG. FIG. 20 is a view showing a case where the edge 70
is attached so as to be symmetrical with respect to the center of the notch 60 in order to prevent
the vibration of the diaphragm 51 from being disturbed. In FIG. 20, the change of the air
pressure generated inside the speaker enclosure 80 is directly transmitted to the end of the
diaphragm 51 and the part covered by the edge 70 (the part shown by a and b in FIG. 20).
Absent.
[0019]
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On the other hand, in the present embodiment, as shown in (b) of FIG. 2, the change in the
internal pressure of the speaker enclosure 50 is directly transmitted to the entire diaphragm 51
without being blocked by the edge 70. The area which receives the fluctuation | variation of the
internal pressure of the enclosure 50 can be enlarged. That is, the effective vibration area of the
diaphragm 51 can be increased.
[0020]
In the configuration described above, when the speaker 10 is driven, the vibration of the cone of
the speaker 10 is transmitted to the air in the speaker enclosure 50, and the vibration of the air
vibrates the vibration portion 51a of the diaphragm 51. At this time, the diaphragm 51 that
vibrates in a state of being kept airtight at the edge 70 compresses or expands the air volume in
the speaker enclosure 50 when it vibrates. Accordingly, in addition to the elasticity of the
diaphragm 51, the air spring of the speaker enclosure 50 also has a new resonance frequency
between the compliance (mechanical flexibility) to which the air spring is added and the
equivalent mass of the diaphragm 51. As a result, a sound to be reproduced centered on the
resonance frequency of the diaphragm 51 is generated.
[0021]
Here, the elasticity (spring property) of the air spring and the diaphragm 51 functions
equivalently so that two springs are connected in parallel, but the air spring is smaller in
compliance than the spring of the diaphragm 51. Therefore, the resonance frequency of the
diaphragm 51 as the speaker system is determined substantially by the compliance of air and the
equivalent mass of the diaphragm 51.
[0022]
The resonance frequency determined as described above can be easily made the desired value in
the bass range.
For example, assuming that the speaker 10 uses a speaker with an effective diameter of 8 cm, a
minimum resonance frequency of 70 z, and Q = 0.35, and the internal capacity of the speaker
enclosure 50 is 3.5 liters, the mass of the diaphragm 51 is 135 grams. The resonant frequency of
the diaphragm can be 50 Hz.
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[0023]
Here, FIG. 4A shows the frequency characteristic of the speaker 10 in the case of the specific
example described above, and FIG. 4B shows the frequency characteristic of the diaphragm 51.
As apparent from this figure, when the above-described numerical value is set in the present
embodiment, it is possible to strongly output the bass in which the vicinity of 50 Hz is
emphasized. Thus, in the present embodiment, by utilizing the bending vibration of the
diaphragm 51, an action as a passive radiator like a drone cone can be obtained.
[0024]
In addition, the vibrating portion 51a performs low-pitched sound reproduction in the primary
vibration mode in which the entire vibrating body vibrates like a fan. The reason is that although
the vibration plate 51 has a secondary, tertiary or higher vibration mode, the entire vibration
plate 51 is driven by air and the primary vibration mode is most strongly generated, and the
other vibrations are generated. This is because the generation level of the mode decreases.
Further, in order to further suppress the high-order mode, the adjustment can be made by the
material or thickness of the diaphragm 51 or by laminating a plurality of materials.
[0025]
In the present embodiment, the diaphragm 51 is elastic enough to support its own weight, so
that even if the diaphragm 51 is placed horizontally, it can be held horizontally by itself. Also,
although the elasticity of the diaphragm 51 itself becomes compliance of free resonance, the
internal loss of the elastic diaphragm 51 is much smaller than the internal loss of the edge 70
having the same elasticity, so the loss during vibration is sufficient small.
[0026]
Further, the edge 70 in the present embodiment can be made of a softer material as compared to
the edge used for a conventional drone cone or the like, and no mechanical strength is required.
Conventional passive radiators such as drone cones require a structure in which a rigid
diaphragm is supported by an edge, so the edge has a dual function of supporting the diaphragm
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and ensuring airtightness. However, in the present embodiment, since the support function of the
diaphragm 51 is given to the diaphragm 51 itself, the edge 70 does not need a support function.
Therefore, it is sufficient for the edge 70 to be able to maintain the air tightness in the speaker
enclosure 50, so that a non-conventional soft material can be used, and a situation that does not
inhibit the vibration of the diaphragm 51 can be created. It can be enlarged. Further, the
resonance frequency of the diaphragm 51 can be lowered by increasing the mass of the
diaphragm 51. That is, the adjustment is possible also by the size and the material of the
diaphragm 51, and the adjustment can be easily performed by affixing any member to the
diaphragm 51.
[0027]
Here, the difference between the present invention and the prior art will be described using an
equivalent circuit. FIG. 5 is an electrical equivalent circuit of the speaker. A low-pass resonant
circuit (resonance frequency = F0) configured of Cmes, Res, and Lces is voltage driven via the
voice coil impedance. Here, Re = voice coil DC resistance Le, L2, R2 = high-pass impedance rising
element Cmes = equivalent mass capacity of loudspeaker vibration system Lces = equivalent
compliance inductance of loudspeaker vibration system Res = mechanical braking resistance of
loudspeaker vibration system.
[0028]
FIG. 6 is an equivalent circuit of the speaker enclosure, where Lve = equivalent volume
inductance. FIG. 7 is an equivalent circuit of a passive radiator such as a conventional drone cone
and hinge fixing flap. As illustrated, it has a circuit configuration in which the factor of the voice
coil is eliminated from the speaker. The mass Cmep is supported by the compliance Lcep of the
edge and the braking resistance Rep. Here, Cmep = equivalent mass capacity of passive radiator
Lcep = equivalent compliance inductance of passive radiator Rep = mechanical braking resistance
of passive radiator FIG. 8 is an equivalent circuit of a conventional passive radiator system. The
signal voltage drives the speaker and the acoustic output of the speaker drives the passive
radiator through the speaker enclosure volume.
[0029]
The low resonance frequency as a system is approximately the resonance frequency of Cmep and
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Lve. To reduce the resonant frequency with a small volume, Cmep needs to be large, which
means that the passive radiator becomes heavy. To support heavy passive radiators, a strong and
strong edge is required. On the other hand, since softness is required for the edge, soft materials
such as rubber and urethane are used, but in order to increase the strength, it needs to be thick.
However, thickening the edge results in lowering the equivalent compliance Lcep and at the same
time increasing the braking force (in terms of the electrical equivalent circuit, this means that the
resistance value Rep decreases). As a result, the loss of the passive radiator increases and the
ability to reproduce the bass decreases.
[0030]
FIG. 9 is an equivalent circuit of a diaphragm according to the present invention. Since one side
of the diaphragm is completely fixed, the diaphragm itself holds the compliance Lceb and
supports its own weight. Since the diaphragm is made of an elastic material, resistance
components such as edge material can be ignored. The edge does not have to support the weight
of the diaphragm, so it may be a thin material, and the compliance Lcex can be made very large,
which inevitably makes the loss very small (in terms of the electrical equivalent circuit, the
braking resistance Rex). Becomes large). In FIG. 9, Cmeb = equivalent mass capacity of diaphragm
Lceb = equivalent compliance inductance of diaphragm Lcex = equivalent compliance inductance
of diaphragm edge Rex = mechanical damping resistance of diaphragm edge. FIG. 10 is an
equivalent circuit of the speaker system in the present invention. In comparison with FIG. 8,
assuming that the speaker and the speaker enclosure volume are the same, if Cmep = Cmeb, the
low frequency resonant frequency is also the same. The compliance to support this weight is also
required to be equivalent, but since Lcep in FIG. 8 and Lcex >> Lceb in FIG. 10, almost Lceb is
obtained, and Lcep = Lceb when properly designed. There is no big difference in the factors so
far. However, as is apparent from the above description, Rex >> Rep is an important feature of
the present invention, which significantly reduces loss compared to the conventional system,
which makes bass reproduction advantageous. I understand that.
[0031]
Further, in the present embodiment, as described above, since the edge 70 is provided so that the
affixing portion 70 a is positioned near the outer edge of the diaphragm 51, the change in the
internal pressure of the speaker enclosure 50 is hindered by the edge 70. The vibration is
directly transmitted to the entire diaphragm 51 without being That is, the effective vibration area
of the diaphragm 51 can be increased.
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[0032]
Further, since the edge 70 has a diameter corresponding to the amplitude A1 at the lower end
portion 51b of the diaphragm 51, the diaphragm 51 is vibrated while absorbing the change so as
not to prevent the vibration of the diaphragm 51. be able to.
[0033]
Although the embodiments of the present invention have been described above, the present
invention is not limited to the above-described embodiments, and can be implemented in various
other modes.
An example is shown below. (1) In the embodiment described above, the notch 60 is covered by
the edge 70 from the inside of the speaker enclosure 50, but may be covered from the surface
side of the speaker enclosure 50 as shown in FIG. FIG. 11 is a cross-sectional view corresponding
to FIG. 2 (b). The effective vibration area of the diaphragm 51 can be increased by setting the
edge affixing surface outside as described above. Further, by attaching an edge to the cutout
from the outside, for example, it is not possible to put a finger or the like in the cutout to pull the
diaphragm to the outside, and it is possible to prevent the speaker enclosure from being
damaged or the like. Thus, the edge (sealing member) can be provided on the front surface side
of one surface (for example, the baffle surface) of the speaker enclosure or on the back surface
side (internal space side).
[0034]
(2) The shape of the edge is not limited to the shape shown in the above-described embodiment,
and the diaphragm is vibrated without giving an extra load to the diaphragm according to the
maximum amplitude of the diaphragm. Any shape may be used. For example, edges of the shapes
shown in (a) to (h) of FIG. 12 may be used. (A) of FIG. 12 is an example which lengthened the
linear part (portion of the arch-shaped column) of the cross-sectional shape of the edge
concerning the embodiment mentioned above, and (b) of FIG. is there. Further, (c) of FIG. 12 is an
example using an S-shaped edge, and (d) is an example using an M-shaped edge. As in the Sshape in FIG. 12 (c), the edge is not only provided on the front surface side or the back surface
side (internal space side) of one surface of the speaker enclosure, but the notches are from the
surface side of the baffle surface (one surface) It can also be mounted across the interior space.
In addition, in the example shown to (d) of FIG. 12, the structure which has the height shift of the
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peak of M character may be sufficient. Alternatively, the structure may have a structure in which
a plurality of peaks and valleys are repeatedly opened. (E) in FIG. 12 has a V-shaped crosssectional shape at each edge, (f) in FIG. 12 is W-type, (g) in FIG. 12 is Ω-type, and (h) in FIG. An
example is shown. Of course, the edge of the composite structure based on the shapes shown in
(a) to (h) of FIG. 12 may be used.
[0035]
In the embodiment described above, the positions of the baffle plate 50a and the diaphragm 51
in the front-rear direction coincide with each other, but for example, the lower part of the
diaphragm 51 may be configured to be offset to the internal space side it can. Thus, in a portion
where the position in the front-rear direction of the diaphragm 51 and the baffle plate 50a
around it is different, for example, as shown in (a) of FIG. Edges may be used. Alternatively, as
shown in (b) of FIG. 13, an edge having a J-shaped cross section that protrudes to the inner space
side may be used. Other than this, for example, it is possible to use edges of various shapes such
as M-shaped, V-shaped, or N-shaped as described above.
[0036]
In the examples shown in FIGS. 12 to 13 as well, by setting the path length of the linear shape of
the edge cross section to correspond to the maximum amplitude of the diaphragm, as in the
embodiment described above, the diaphragm is redundant. The diaphragm can be vibrated
without applying a load. Furthermore, since the edge is provided in the vicinity of the outer edge
of the diaphragm, the change in the internal pressure of the speaker enclosure is directly
transmitted to the diaphragm without being blocked by the edge, so that the effective vibration
area of the diaphragm can be made large. In particular, in the example shown in FIG. 13, the
effective vibration area can be increased by the difference in the positional relationship between
the mounting surface and the diaphragm.
[0037]
(3) In the embodiment described above, the diameter of the roll of the edge 70 covering the
notch 60 was uniform. Instead of this, it is possible to use an edge having a shape whose
extension length differs depending on the place. Specifically, for example, as shown in FIG. 14,
the edge 90 may be provided such that the diameter of the roll is larger the closer to the lower
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end portion 51 b of the diaphragm 51. FIG. 14 (a) is a side sectional view of the speaker
enclosure which is this modification, and FIG. 14 (b) is a view showing the back surface of the
baffle plate 50a corresponding to FIG. Moreover, (c) of FIG. 14 and (d) are the cross-sectional
views in the AA and BB line of (a), respectively.
[0038]
In the case of an edge used in a conventional speaker unit or the like, the force applied to the
edge has no difference in displacement from part to part. However, in the speaker system having
a partial difference in the displacement amount of the diaphragm as shown in the abovedescribed embodiment, the vibration of the diaphragm becomes a vibration that causes distortion
at the edge, and It may be damaged. Furthermore, the effective vibration area of the diaphragm
may be reduced because the edge width is adjusted to the maximum amplitude.
[0039]
On the other hand, in the example shown in FIG. 14, by gradually increasing the diameter R of
the edge roll toward the lower part, the amplitude of the diaphragm can be increased as the part
is farther from the support end of the diaphragm. By this, it is possible to operate without giving
an extra load to the diaphragm side corresponding to the maximum amplitude, and the operation
of the diaphragm can be made smooth. Also, no extra load or distortion occurs.
[0040]
In the example shown in FIG. 14, the edge with the larger diameter of the roll is used closer to
the lower end of the diaphragm, but instead, the diameter R of the roll is constant as shown in
FIG. As it is, the edge 100 may be such that the straight portion of the edge is longer as it is
closer to the lower end of the diaphragm. Alternatively, using the example of FIG. 14 and the
example of FIG. 15 together, an edge is used in which the diameter R of the roll and the length of
the straight portion both increase as the distance from the support portion of the diaphragm
increases. Good. Summarizing the above configuration, it is preferable that the edge (sealing
member) has a linear cross-sectional shape and that the path of the line changes in accordance
with the distance from the connecting portion.
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[0041]
(4) In addition, the edge may differ in the thickness for every part. Specifically, for example, as
shown in FIG. 16, an edge 110 may be used which has a thinner portion to be operated. By doing
this, the vibrating motion of the diaphragm can be made smoother. That is, the edge (sealing
member) may have a curved portion in its cross-sectional shape, and the thickness of the curved
portion may be thinner than the other portions. This is a configuration applicable to all types of
edges described above.
[0042]
(5) In the embodiment described above, the notch is provided on the surface of the speaker
enclosure on which the speaker is provided to form the diaphragm, but the position where the
diaphragm is formed (the notch is provided) is The position is not limited, and any position may
be provided as long as it is one side of the speaker enclosure.
[0043]
FIG. 17 is a view showing an example of the formation position of the diaphragm, and FIG. 17 (a)
is a perspective view showing the appearance of the speaker system.
(B) of FIG. 17 is a perspective view of the same modification as viewed from the back, and (c) of
FIG. 17 is a side sectional view. As shown in these figures, in this example, the notch 60 is
provided on the surface facing the baffle plate 50 a, that is, on the rear surface of the speaker
enclosure 50.
[0044]
(6) When making an elongate notch like an embodiment mentioned above, it does not restrict to
U shape. It may be V-shaped, trapezoidal or O-shaped. In short, on one side of the speaker
enclosure, assuming a virtual plane figure surrounded by a line, with a part of the outline as a
connection part, if this connection part is left as it is a cutout part cut out along the outline The
portion surrounded by the notch may function as a vibrating plate that can be vibrated by
elasticity with the vicinity of the connection portion as a fulcrum. For example, although the
appearance of the speaker system is shown in (b) of FIG. 18, the notch 60 may be formed so that
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the entire lower part of the baffle plate 50 a is configured as the diaphragm 51 as illustrated. The
same figure (a) is a side sectional view in this case.
[0045]
(7) Further, as shown in FIG. 19, the speaker enclosure and the edge may be integrally formed.
Specifically, for example, the edge portion is made thin by a member such as a synthetic resin,
and the diaphragm and the wall portion of the speaker enclosure are made thick. As a method of
integral formation, for example, there is a method of integrally forming the other five sides with
the back side of the speaker removed, and thereafter bonding the back side.
[0046]
(8) In the embodiment described above, the cross-sectional shape of the edge is linear, and by
making the path of the line larger than the cross-sectional width of the notch, the vibration of the
diaphragm is configured freely. If the edge itself is flexible and stretchable, the vibration of the
diaphragm can be absorbed by stretching (elasticity) even if the path length of the cross-sectional
line of the edge is the same as the cross-sectional width of the notch. .
[0047]
It is a perspective view showing the appearance of the embodiment of the present invention.
It is a figure which shows the internal structure of the embodiment. It is a figure which shows the
back surface of the baffle plate 50a of the embodiment. It is a graph which shows the frequency
characteristic of the embodiment. It is an electrical equivalent circuit of a speaker. It is an
electrical equivalent circuit of a speaker enclosure. It is an equivalent circuit of a conventional
passive radiator. It is an equivalent circuit of the conventional passive radiator system. It is an
equivalent circuit of the diaphragm concerning this invention. It is an equivalent circuit of the
speaker system concerning this invention. It is a figure which shows the modification of this
invention. It is a figure which shows an example of the shape of the edge which concerns on the
modification of this invention. It is a figure which shows an example of the shape of the edge
which concerns on the modification of this invention. It is a figure which shows the modification
of this invention. It is a figure which shows the modification of this invention. It is a figure which
shows an example of the shape of the edge which concerns on the modification of this invention.
It is a figure which shows the modification of this invention. It is a figure which shows the
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modification of this invention. It is a figure which shows the modification of this invention. It is a
figure which shows an example of the attachment position of an edge.
Explanation of sign
[0048]
DESCRIPTION OF SYMBOLS 1 ... Speaker system, 10 ... Speaker, 50, 80 ... Speaker enclosure, 50a
... Baffle board, 51 ... Diaphragm, 60 ... Notch part, 70, 90, 100, 110 ... Edge.
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