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DESCRIPTION JP2007150871

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DESCRIPTION JP2007150871
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
スピーカシステムおよびスピーカエンクロージャー
[0001]
The present invention relates to the technology of a speaker system and a speaker enclosure.
[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]
A speaker system according to the present invention includes a speaker enclosure sealed inside, a
speaker attached to the speaker enclosure, a diaphragm capable of vibrating by elasticity with
one end fixed on one surface of the speaker enclosure, the vibration In one surface provided with
a plate, an opening portion provided at a position corresponding to a vibrating portion of the
diaphragm, and a gap formed between the diaphragm and an edge portion of the opening
portion It seals in the state which enabled vibration, fixes the sealing member which maintains
airtightness of the said speaker enclosure, and a part of the fixed side of the said diaphragm on
the said one surface, and changes the supporting point position of the vibration of the said
diaphragm And a fulcrum position changing member.
[0008]
A speaker system according to the present invention includes a speaker enclosure sealed inside, a
speaker attached to the speaker enclosure, and a diaphragm capable of vibrating by elasticity
with one end fixed on one surface of the speaker enclosure. In the one surface provided with the
diaphragm, the vibration formed between the opening provided at a position corresponding to
the vibration part of the diaphragm, the diaphragm and the edge of the opening is the vibration A
sealing member for closing the speaker enclosure in a state in which vibration of the plate is
made possible and holding the airtightness of the speaker enclosure, and a supporting member
for supporting the speaker enclosure and capable of changing the vertical angle of the one
surface in the supporting state. It is characterized by being equipped.
[0009]
A speaker system according to the present invention includes a speaker enclosure sealed inside, a
speaker attached to the speaker enclosure, and a diaphragm capable of vibrating by elasticity
with one end fixed on one surface of the speaker enclosure. In the one surface provided with the
diaphragm, the vibration formed between the opening provided at a position corresponding to
the vibration part of the diaphragm, the diaphragm and the edge of the opening is the vibration It
is provided at a position where the plate is closed in a state in which vibration of the plate is
enabled and the sealing member for keeping the airtightness of the speaker enclosure and the
vibration area of the diaphragm collide to collide with each other. And a stopper member for
restricting the pressure so as not to exceed a predetermined value.
[0010]
A speaker system according to the present invention includes a speaker enclosure sealed inside, a
speaker attached to the speaker enclosure, and a diaphragm capable of vibrating by elasticity
with one end fixed on one surface of the speaker enclosure. In the one surface provided with the
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diaphragm, the vibration formed between the opening provided at a position corresponding to
the vibration part of the diaphragm, the diaphragm and the edge of the opening is the vibration
The diaphragm is closed in a state in which vibration of the plate is enabled, and the sealing
member for keeping the airtightness of the speaker enclosure and the diaphragm are configured
to be removable, and when the diaphragm is mounted, movement of the diaphragm And a fixing
member for restraining and fixing.
[0011]
A speaker system according to the present invention includes a speaker enclosure sealed inside, a
speaker attached to the speaker enclosure, and a diaphragm capable of vibrating by elasticity
with one end fixed on one surface of the speaker enclosure. In the one surface provided with the
diaphragm, the vibration formed between the opening provided at a position corresponding to
the vibration part of the diaphragm, the diaphragm and the edge of the opening is the vibration
And a sealing member for closing the speaker enclosure in a state that enables vibration of the
plate and holding the airtightness of the speaker enclosure, wherein the tip of the vibrating
portion of the diaphragm is located inside the speaker enclosure from the one side, the tip Is
characterized in that it collides with the one surface when the shake amount becomes equal to or
more than a predetermined value.
In a preferred aspect of the present invention, a member to which one end of the diaphragm is
fixed is provided, and the member is provided with a collision prevention structure for avoiding
collision of the end surface of the diaphragm with the member due to vibration. It is
characterized by
[0012]
A speaker enclosure according to the present invention is a sealed speaker enclosure having a
speaker mounting hole to which the speaker is attached, wherein the vibration is capable of
vibrating by elasticity in a state where one end is fixed to one surface of the speaker enclosure; In
one surface provided with a plate, an opening portion provided at a position corresponding to a
vibrating portion of the diaphragm, and a gap formed between the diaphragm and an edge
portion of the opening portion It seals in the state which enabled vibration, fixes the sealing
member which maintains airtightness of the said speaker enclosure, and a part of the fixed side
of the said diaphragm on the said one surface, and changes the supporting point position of the
vibration of the said diaphragm And a fulcrum position changing member.
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[0013]
A speaker enclosure according to the present invention is a sealed speaker enclosure having a
speaker mounting hole to which the speaker is attached, wherein the vibration is capable of
vibrating by elasticity in a state where one end is fixed to one surface of the speaker enclosure; In
one surface provided with a plate, an opening portion provided at a position corresponding to a
vibrating portion of the diaphragm, and a gap formed between the diaphragm and an edge
portion of the opening portion It is closed at a position where vibration is possible, and is
provided at a position where the sealing member which holds the airtightness of the speaker
enclosure and the vibration region of the diaphragm so as to collide with the vibration region of
the diaphragm and the vibration amount of the diaphragm is predetermined. And a stopper
member configured to regulate so as not to exceed the value.
[0014]
A speaker enclosure according to the present invention is a sealed speaker enclosure having a
speaker mounting hole to which the speaker is attached, wherein the vibration is capable of
vibrating by elasticity in a state where one end is fixed to one surface of the speaker enclosure; In
one surface provided with a plate, an opening portion provided at a position corresponding to a
vibrating portion of the diaphragm, and a gap formed between the diaphragm and an edge
portion of the opening portion It is closed in a state that enables vibration, and is configured to
be removable from a sealing member that maintains the airtightness of the speaker enclosure,
and the diaphragm, and restricts movement of the diaphragm when mounted on the diaphragm.
And a fixing member to be fixed.
[0015]
A speaker enclosure according to the present invention is a sealed speaker enclosure having a
speaker mounting hole to which the speaker is attached, wherein the vibration is capable of
vibrating by elasticity in a state where one end is fixed to one surface of the speaker enclosure; In
one surface provided with a plate, an opening portion provided at a position corresponding to a
vibrating portion of the diaphragm, and a gap formed between the diaphragm and an edge
portion of the opening portion And a sealing member for closing the speaker enclosure in an
airtight state, the distal end of the vibrating portion of the diaphragm being located in the
interior of the speaker enclosure from the one surface, and the distal end swinging When the
amount exceeds a predetermined value, it collides with the one surface.
[0016]
Hereinafter, embodiments of the present invention will be described with reference to the
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drawings.
First Embodiment FIG. 1 is a perspective view showing an appearance of a speaker system
according to a first 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.
[0017]
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.
[0018]
A notch 60 cut into a U-shape is provided from the central portion to the lower portion of the
baffle plate 50a.
A portion surrounded by the notch 60 is a vibrating diaphragm 51.
That is, since the upper part of the diaphragm 51 is integral with the baffle plate 50a and the
other part is separated from the baffle plate 50a by the U-shaped notch 60, the diaphragm 51
has its upper end fixed. Can vibrate freely.
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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.
[0019]
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.
[0020]
(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.
[0021]
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
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
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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.
[0022]
FIG. 4 is a view showing a state in which the fulcrum position adjusting member 52 is attached to
the speaker enclosure 50 shown in FIG. The fulcrum position adjusting member 52 is formed of a
plate-like member (for example, wood, synthetic resin, metal, or a composite material obtained by
laminating them), and is fixed to the speaker enclosure 50 by four screws 53. ing. (A) of FIG. 5 is
a cross-sectional view of the fulcrum position adjusting member 52, and (b) of FIG. 5 shows the
back surface of the baffle plate 50a. In FIG. 5 (b), the edge 70 is omitted to simplify the
description. As shown in (a) of FIG. 5, the wide end 53 a of the screw 53 is locked to the inside of
the speaker enclosure 50 (the back surface of the baffle plate 50 a), and the nut 54 is tightened
with respect to this. The fulcrum position adjusting member 52 is fixed to the speaker enclosure
50. In addition, according to the difference in thickness between the diaphragm 51 and the baffle
plate 50a, the thickness of the one end portion 53a of the screw 53 on the side in contact with
the diaphragm 51 is formed thick. Further, as shown in FIG. 5B, the planar shape of the one end
portion 53a of the screw 53 is elliptical, and the length of the short axis is set smaller than the
width of the opening 60 of the speaker enclosure 50 It is done. Therefore, as shown in FIG. 5B,
when one end 53a is rotated and the direction of the major axis is aligned with the length
direction of the opening 60, the one end 53a passes through the opening 60 and is inside the
speaker enclosure 50. Can be inserted into
[0023]
The portion of the diaphragm 51 to which the fulcrum position adjusting member 52 is attached
is fixed to the baffle plate 50a and does not vibrate. That is, by attaching the fulcrum position
adjusting member 52 to the speaker enclosure 50, the fulcrum of the vibration of the diaphragm
51 can be changed. In this manner, the resonance frequency of the diaphragm 51 can be
changed by changing the fulcrum of vibration of the diaphragm 51, whereby the low frequency
characteristic of the speaker system can be easily changed.
[0024]
The resonance frequency can be changed by making it possible to replace a plurality of
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supporting point position adjusting members 52 having different sizes as shown in (a) and (b) of
FIG.
[0025]
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.
[0026]
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.
[0027]
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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[0028]
Here, FIG. 7A shows the frequency characteristic of the speaker 10 in the case of the specific
example described above, and FIG. 7B 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.
[0029]
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.
[0030]
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.
[0031]
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
and ensuring airtightness. However, in the present embodiment, since the support function of the
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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.
[0032]
Here, the difference between the present invention and the prior art will be described using an
equivalent circuit. FIG. 8 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.
[0033]
FIG. 9 is an equivalent circuit of the speaker enclosure, where Lve = equivalent volume
inductance. FIG. 10 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. 11 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.
[0034]
The low resonance frequency as a system is approximately the resonance frequency of Cmep and
Lve. To reduce the resonant frequency with a small volume, Cmep needs to be large, which
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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.
[0035]
FIG. 12 is an equivalent circuit of the 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. 12, 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. 13
is an equivalent circuit of the speaker system in the present invention. In comparison with FIG.
11, assuming that the speaker and the speaker enclosure volume are the same, if Cmep = Cmeb,
then 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. 11 and Lcex >> Lceb in FIG. 13,
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.
[0036]
Second Embodiment Next, a second embodiment of the present invention will be described. FIG.
14 is a side view of the second embodiment of the present invention. In the figure, 100 is a
support member for adjusting and fixing the speaker enclosure 50 at an angle. In addition, the
speaker enclosure 50 in FIG. 14 is the same as that of what was shown in 1st Embodiment, and
abbreviate | omits the description here. The lower portion of the support member 100 is a leg
that can stand on the installation surface P such as a shelf or a desk. The upper portion of the
support member 100 is structured to support the speaker enclosure 50 at the fulcrum 101. A
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hole is provided at the fulcrum 101, and a screw is penetrated here. On the other hand, a female
screw is cut in a portion corresponding to the fulcrum 101 of the speaker enclosure 50, and a
screw passing through the above-mentioned hole is screwed. Therefore, when the screw is
tightened, the upper portion of the support member 100 presses the side surface of the speaker
enclosure 50, so the speaker enclosure 50 is fixed. On the other hand, when the screw is
loosened, the speaker enclosure 50 is rotatable in the vertical direction about the fulcrum.
Therefore, the angle can be maintained by tightening the screw while setting the angle of the
baffle plate to which the diaphragm 51 is attached to a desired angle. That is, the angle of the
diaphragm 51 of the speaker enclosure 50 can be adjusted. Depending on the angle of the
diaphragm 51, the manner in which the weight of the fulcrum is applied changes, so the
resonance frequency can be changed.
[0037]
Third Embodiment Next, a third embodiment of the present invention will be described. FIG. 15 is
a perspective view showing the appearance of a speaker system according to a third embodiment
of the present invention, and FIGS. 16 (a) and 16 (b) are side sectional and side views showing
the configuration of the same embodiment. It is. In FIG. 15, the speaker 10 is attached to the
front of the speaker enclosure 20. Moreover, as shown to Fig.16 (a), the thin-plate shaped
diaphragm 30 is attached to the baffle plate 20a of the front surface of the speaker enclosure 20.
As shown in FIG. The diaphragm 30 is formed to the same size as the front surface of the speaker
enclosure 20 and covers the entire front surface of the speaker enclosure 20. A speaker
mounting hole is provided through the diaphragm 30 and the baffle plate 20a, and the abovedescribed 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 diaphragm 30 and the baffle plate 20a by screws.
[0038]
As shown in FIG. 16A, the baffle plate 20 a is formed only on the upper half of the front surface
of the speaker enclosure 20. Further, the bottom surface 20c of the speaker enclosure 20 is
formed slightly shorter than the top surface 20d, and as shown in the figure, is a front end
portion 20e extending upward so that the front side protrudes forward.
[0039]
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Further, as shown in FIGS. 16A and 16B, the lower portion on the front side of the side surface
20f of the speaker enclosure 20 is inclined from the lower end of the baffle plate 20a to the front
end 20e of the bottom surface 20c to form an inclined portion 20g. ing. A space surrounded by
the lower end of the baffle plate 20a described above, the inclined portion 20g, and the upper
edge of the front end portion 20e is an opening 20b. In the above configuration, the upper
portion of the diaphragm 30 is fixed to the baffle plate 20a, but the lower portion of the
diaphragm 30 is a free end like a cantilever because it is opposed to the opening 20b, The
elasticity of the diaphragm 30 enables free vibration. In the following, the lower part of the
diaphragm 30 is referred to as a vibrating portion 30a.
[0040]
Next, 40 is an edge which is provided between the outer peripheral edge of the vibration portion
30 a of the diaphragm 30 and the edge of the opening 20 b and maintains the airtightness of the
speaker enclosure 20. In this case, between the side edge of the vibrating portion 30a and the
inclined portion 20g, the edge 40 extends longitudinally in a portion projecting and bending
toward the inner space of the speaker enclosure 20 (hereinafter referred to as a broken portion
40a). Further, between the lower end edge of the vibrating portion 30a and the front end portion
20e, the portion projecting and bending toward the inner space of the speaker enclosure 20
extends in the horizontal direction (hereinafter referred to as a broken portion 40b). Here, FIG.
17 is a front view of the speaker enclosure 20 with the diaphragm 30 removed. The hatched
portion in FIG. 17 is an edge 40, and portions of the edge 40 that protrude to the inner space
side of the speaker enclosure 20 are broken portions 40a and 40b. FIG. 18 is a bottom view of
the speaker enclosure 20. FIG.
[0041]
The outer peripheral edge portion of the edge 40 shown in FIG. 17 is bonded to the outer
peripheral edge portion of the vibration portion 30 a of the diaphragm 30, whereby the
airtightness of the speaker enclosure 20 is maintained. In addition, when the bent portions 40a
and 40b of the edge 40 are freely bent, the vibration of the vibrating portion 30a is not disturbed
and becomes free vibration. In addition, although the speaker terminal connected to the voice
coil of the speaker 10 is provided in the back surface of the speaker enclosure 20, it is abbreviate
| omitting in FIG. 16 (a), (b).
[0042]
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In FIG. 15, reference numeral 301 denotes a stopper member such as elastic rubber, and
reference numeral 302 denotes a stopper provided at a position overlapping the stopper member
301. The stopper 302 is attached to the tip of an arm member extending from the lower surface
of the speaker enclosure 20, and its position is set slightly outside the normal vibration stroke of
the diaphragm 30. Therefore, the stopper 302 does not disturb the vibration operation of the
diaphragm 30. Here, FIGS. 16A and 16B are a side sectional view and a side view of the speaker
enclosure 20, and FIG. 17 is a front view showing a state in which the diaphragm 30 is removed
in the present embodiment. Is a bottom view of this embodiment. In these figures, the positional
relationship between the stopper 302 and the arm member is shown.
[0043]
By providing the stopper 302, it is possible to prevent the diaphragm 30 from being pulled to the
front by exceeding the allowable value, and thereby, it is possible to prevent damage to the edge
40 and the diaphragm 30. The number of stoppers and the positions thereof are not limited to
those shown in FIG. 15, and any stoppers can be used as long as they can prevent damage to the
edge and the diaphragm. For example, as shown in FIG. 19, a pair of stopper members 301 and
stoppers 302 may be provided. Further, since the weight of the stopper member 301 described
above affects the behavior of the vibration of the diaphragm 30, the stopper member 301 also
functions to adjust the resonance frequency.
[0044]
Fourth Embodiment Next, a fourth embodiment of the present invention will be described. FIG.
20 is a perspective view showing an appearance of a speaker system according to a fourth
embodiment of the present invention. This speaker system differs from the speaker system
shown in the third embodiment in that a hook 303 (shown in FIG. 20) is provided instead of the
stopper member and the stopper. The hook 303 is rotatably fixed to the inclined portion 20 g of
the speaker enclosure 20, and the tip thereof can be engaged with the ring 304 provided on the
lower side surface of the diaphragm 30. By the hooks 303 engaging with the ring 304, the
diaphragm 30 can be fixed to the speaker enclosure 20 main body. As a result, unnecessary
vibration of the diaphragm 30 can be suppressed during transportation or the like, and breakage
can be prevented.
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[0045]
Note that, instead of the hooks 303, the diaphragm 30 may be fixed to the speaker enclosure 20
by fixing members 313 such as bands, bands, or cords as shown in FIG. 21, for example.
Alternatively, in the speaker system in which the notch is provided in the baffle plate to form the
diaphragm as shown in the first embodiment, for example, as shown in FIG. May be fixed to the
speaker enclosure 50. The clasp mechanism 305 is formed by passing an elongated plate-like
penetrating member 305 c through an arched member 305 a provided on the diaphragm 51 side
and an arched member 305 b provided on the baffle plate side. Fix the
[0046]
Fifth Embodiment Next, a fifth embodiment of the present invention will be described. Fig.23 (a)
is a perspective view which shows the external appearance of the speaker system which is the
5th Embodiment of this invention, (b) and (c) is a side sectional view and the cross-sectional view
of the same embodiment, respectively. is there. As shown, the baffle plate 80a of the speaker
enclosure 80 is provided with a rectangular opening. Also, as shown in FIG. 23B, a support
member 83 extending in the horizontal direction is provided inside the upper portion of the
opening of the baffle plate 80a, and the diaphragm 82 is fixed to the support member 83. . In the
fixing method in this case, the front surface of both contact surfaces is fixed so as to be firmly
adhered by a double-sided tape or an adhesive. In addition, an edge 81 covers the periphery of
the opening of the baffle plate 80 a and the diaphragm 82, and the edge 81 secures the
airtightness of the speaker enclosure 80.
[0047]
As described above, the diaphragm 82 can not be forcibly pulled out by disposing the tip of the
diaphragm 82 at a position slightly lower than the upper edge of the front lower portion of the
speaker enclosure 80 inside the baffle plate 80 a. , And damage to the diaphragm 82 and the
edge 81 can be prevented.
[0048]
The diaphragm may be configured to be fixed to a plate-like support by screws.
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In this case, as shown in FIG. 24A, the corners of the support 83 may be hit by the vibration of
the diaphragm 82 to generate noise. On the other hand, in the present embodiment, since the
front surface of the joint surface of the support member 83 and the diaphragm 82 is firmly
bonded with the double-sided tape or the adhesive, the diaphragm 82 does not come out of the
support member 83 and is struck. Generation of noise due to
[0049]
In addition, as another example of the attachment method of the diaphragm for preventing
floating and striking of the diaphragm, for example, as shown in FIG. A relief space may be
provided according to the displacement due to the vibration of the diaphragm 82.
[0050]
Alternatively, as shown in FIG. 24C, a pressure plate 85 made of, for example, metal or resin may
be provided to suppress the diaphragm 82 with springiness.
In place of the holding plate 85, a groove may be provided in the support member in which one
end of the diaphragm is inserted, and the diaphragm may be fixed by fitting to this groove to
prevent occurrence of "striking". .
[0051]
Alternatively, as shown in FIG. 24 (d), a fixing member 86 made of metal or hard resin having the
same width as the support material 83 is provided on the side of the diaphragm 82 facing the
support material 83. It is good also as a structure which prevents hitting and floating of
diaphragm 82. The above configuration is summarized as follows. That is, a member to which
one end of the diaphragm is fixed may be provided, and the member may be provided with a
collision prevention structure for avoiding collision of the end surface of the diaphragm with the
member due to vibration. In this case, the collision preventing structure may be a fixing structure
(for example, FIGS. 24C and 24D) for fixing the end face of the diaphragm to the member without
a gap, and the vibration region of the end face of the diaphragm A space corresponding to the
space (a clearance space) may be provided (for example, FIG. 24 (b)).
[0052]
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The method of attaching the diaphragms shown in FIGS. 24 (b) to 24 (d) for preventing floating
and striking of the diaphragms is not limited to the configuration of the speaker enclosure 80
shown in FIG. For example, as shown in FIG. 25, the present invention can also be applied to the
case where the diaphragm 92 is provided on the front surface of the baffle plate 90a. FIG. 25 (a)
is a perspective view of the speaker system, and FIGS. 25 (b) and 25 (c) are a side sectional view
and a side view of the speaker system, respectively.
[0053]
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 first 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 not limited
to this, and may be at any position on the one side of the speaker enclosure. For example, a notch
may be provided on the surface opposite to the baffle plate, that is, on the rear surface of the
speaker enclosure.
[0054]
(2) When making a long and thin 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.
[0055]
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 figure which shows the state which
attached the fulcrum position adjustment member of the embodiment. It is a figure which shows
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the structure of a fulcrum position adjustment member. It is a figure which shows an example of
the shape of a fulcrum position adjustment member. 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 side view of the speaker system which is a 2nd
embodiment of the present invention. It is a perspective view which shows the external
appearance of the speaker system which is 3rd Embodiment of this invention. It is a figure which
shows the internal structure of the embodiment. It is a front view which shows the state which
removed the diaphragm in the embodiment. It is a bottom view of the embodiment. It is a figure
which shows the modification of the embodiment. It is a perspective view which shows the
external appearance of the speaker system which is 4th Embodiment of this invention. It is a
figure which shows the modification of the embodiment. It is a figure which shows the
modification of the embodiment. It is a figure which shows the speaker system which is 5th
Embodiment of this invention. It is a figure which shows an example of the attachment method of
a diaphragm. It is a figure which shows the modification of the embodiment.
Explanation of sign
[0056]
DESCRIPTION OF SYMBOLS 10 ... Speaker, 20, 50, 80, 90 ... Speaker enclosure, 50a ... Baffle
board, 30, 51, 82, 92 ... Diaphragm, 51a ... Vibration site | part, 52 ... Support point position
adjustment member, 53 ... Fixing screw, 54 ... Nuts, 60: Notches, 40, 70, 81, 91: Edges, 83:
Support materials, 100: Support members, 101: Support points, 301: Stopper members, 302:
Stoppers, 303: Hooks, 304: Rings, 305: 305 Clasp mechanism, 313 ... fixed member.
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