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DESCRIPTION JPH06245286

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DESCRIPTION JPH06245286
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
bass reflex speaker.
[0002]
2. Description of the Related Art There is widely known a bass reflex type loudspeaker having a
bass reflex duct which gives a suitable phase change to the sound wave radiated from the back of
the speaker unit and emits it in phase with the sound wave from the front of the speaker unit. .
[0003]
A speaker of this bus reflex type has a structure as schematically shown in FIG.
16 (a) is a front view of the speaker, and FIG. 16 (b) is a sectional view taken along the line XX, 1
is an enclosure, 2 is a baffle plate forming the front of the enclosure, 3 is a speaker unit, 4 is
provided in a pair The speaker unit 3 is attached to the baffle plate 2. In addition, the duct 4 is
formed in a cylindrical shape, and is integrally formed on the baffle plate 2 or separately formed
and attached.
[0004]
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1
In this case, the sound wave A2 emitted to the back from the speaker unit 3 is in reverse phase to
the sound wave A1 emitted to the front of the speaker unit 3, but the sound wave A2 emitted to
the inner space 5 of the enclosure 1 is The light is introduced into the duct 4 from the opening
4a and emitted from the external opening 4b to the front of the speaker. At this time, the volume
of the internal space 5, the length of the duct 4, the opening area, etc. are selected so that the
sound wave A2 has the same phase as the sound wave A1.
[0005]
However, such a conventional bass reflex speaker has the following problems.
[0006]
First of all, as a manufacturing problem, the duct is usually formed in a cylindrical shape (or
prismatic shape). Therefore, a large space is required in the packing state in the state of parts,
and the transportability is very bad. There is a problem that the cost is also high.
That is, since the ducts are cylindrical, it is not possible to stack a plurality of ducts in a stacked
state. Further, in the state where the ducts are attached to the baffle plate, it is not possible to
stack a plurality of baffle plates and pack them, and a depth corresponding to the length of the
duct is required, resulting in a large dead space in the packaged state.
[0007]
Next, in terms of sound quality, air column resonance may occur in the duct 4 as indicated by an
arrow M in FIG. This causes resonance at a frequency having a wavelength four times the duct
length, and the vibration of the arrow M affects the sound quality. Further, when the opening
area of the internal opening 4a of the duct 4 is small, so-called wind noise is generated by the air
flowing into the duct 4 from the internal opening 4a, which also causes the deterioration of the
sound quality. Alternatively, for this purpose, the opening area of the internal opening 4a must
be taken to a certain extent, and the degree of freedom in the design of the shape of the duct 4
will be hampered.
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[0008]
Furthermore, in the case of a speaker provided with a plurality of (for example, a pair of) ducts 4
as shown in FIG. 16, a subtle phase shift easily occurs in sound waves radiated from each duct,
which also causes sound quality deterioration.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in view of these problems,
and in a bus reflex type speaker, a duct shape, an attachment state, or a baffle plate is configured
as follows for transportation. To improve the quality and improve the sound quality.
[0010]
That is, according to the first aspect of the present invention, the main body of the duct attached
to the baffle plate has a substantially conical peripheral surface shape or a substantially
pyramidal peripheral surface shape, and an opening on the inside of the enclosure The opening is
formed such that all or a part of the inner opening end face is a non-perpendicular surface to the
longitudinal axis of the duct.
[0011]
FIG. 3 schematically shows an example corresponding to this configuration.
Fig.3 (a) is a front view of the speaker of this invention, FIG.3 (b) is YY sectional drawing.
In the figure, 11 is an enclosure, 12 is a baffle plate, 13 is a speaker unit, and 14 is a duct.
In this case, the duct 14 is provided as a pair of ducts 141 and 142, but the present invention is
applicable to a single duct speaker.
[0012]
In the present invention, in the duct 14 (141, 142), for example, as shown in FIG. 3B, the main
body 14c (14c1, 14c2) is directed from the outer opening 14b (14b1, 14b2) to the inner opening
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14a (14a1, 14a2). The inner and outer surfaces are inclined so as to have a substantially conical
peripheral surface shape that narrows. Alternatively, it may be inclined to narrow from the inner
opening 14a to the outer opening 14b. Furthermore, the slope may be curved. The inner opening
14a (14a1, 14a2) is formed to be obliquely tapered so as not to be a plane V perpendicular to the
longitudinal axis J of the duct.
[0013]
The duct is, for example, such that the main body portion has a substantially conical peripheral
surface shape and the internal opening has a tapered cut-off shape.
[0014]
Next, according to the second aspect of the present invention, as described above, at least a pair
of cut-away ducts whose main body portion has a substantially conical peripheral surface shape
and whose internal opening has a tapered shape as shown in FIG. When the direction of the other
ducts relative to the duct is 0 °, the inner open end faces, which are non-perpendicular surfaces
of the respective ducts, are at the same angle within the direction of -90 ° to 90 ° with respect
to the other ducts. Make it appear.
[0015]
This configuration will be described with reference to FIG.
For example, as shown in FIG. 7A, it is assumed that a pair of ducts 141 and 142 are provided.
FIG. 7 (a) is a perspective view of the speaker as viewed from the internal space of the enclosure
11, and the ducts 141 and 142 are shown in a state in which the internal openings 14a1 and
14a2 are not tapered off. .
[0016]
Now, on the vertical plane V shown in FIG. 3B, which is perpendicular to the longitudinal axis J of
the main body portions 14c1 and 14c2 of the ducts 141 and 142, the angle coordinates are as
shown in FIG. 7A. It will be provided. At this time, angle coordinates corresponding to the ducts
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141 and 142 are considered to have a direction toward the other ducts 142 and 141 as 0 ° as
shown in the drawing.
[0017]
At this time, as shown by arrows U from above and arrows R from the right side of the speaker,
the tapered inner opening end faces 14a1 and 14a2 are mutually as shown in FIGS. 7 (b) to 7 (e)
in various angular states. Become.
[0018]
In FIG. 7 (b), the open end faces of the internal openings 14a1 and 14a2 which are nonperpendicular surfaces of the ducts 141 and 142 appear in the direction of 90 DEG with respect
to the other duct.
In FIG. 7C, the open end faces of the internal openings 14a1 and 14a2 which are nonperpendicular surfaces of the ducts 141 and 142 appear in the direction of -90 DEG with respect
to the other duct. In FIG. 7D, the open end faces of the internal openings 14a1 and 14a2 which
are non-perpendicular surfaces of the ducts 141 and 142 appear in the direction of 0 DEG with
respect to the other duct. In FIG. 7 (e), the open end faces of the internal openings 14a1 and
14a2 which are non-perpendicular surfaces of the ducts 141 and 142 appear in the direction of
45 DEG with respect to the other duct.
[0019]
According to the second aspect of the present invention, the open end faces of the internal
openings 14a1 and 14a2 which are the non-perpendicular surfaces of the ducts 141 and 142 are
90 ° to 7 in FIG. 7A with respect to the other ducts. The same angular state in the range of 0 °
in (d) to -90 ° in FIG. 7C (in this case, the angles have the same meaning when the direction of
the other duct is 0 °, for example, 7 (b) to 7 (e)), that is, the inner opening end faces appear in
directions facing each other.
[0020]
In the invention according to claim 3, as described above, the open end face of the nonperpendicular surface of the one or a plurality of ducts of which the main body portion has a
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substantially conical peripheral surface shape and the internal opening has a tapered shape is
substantially a baffle. Make it appear towards the direction of the speaker unit attached to the
board.
That is, in the example of FIG. 7A, in this case, the speaker unit 13 is located at an upper position
of approximately 45 ° with respect to each of the ducts 141 and 142. Therefore, as shown in
FIG. The opening end face is configured to face 45 °.
[0021]
Further, according to the present invention according to the fourth aspect, when a plurality of
ducts are stacked, a contact stepped portion is provided on the outer peripheral surface of the
duct having the above-mentioned shape to abut the end of the main body of the stacked duct. For
example, as shown in FIG. 9A, the duct 14 is provided with an abutment step 14d that abuts
against the end 14e of the main body of the other duct 14 to be stacked.
[0022]
Further, according to the present invention as claimed in claim 5, when a plurality of baffle plates
are stacked on the inner flat surface of the baffle plate to which the duct of the above-mentioned
shape is attached, abuts against the contact portion of the outer flat surface of the baffle plate to
be stacked. An abutted portion capable of positioning in a stacked state is provided. For example,
as shown in FIG. 10 (a), an abutted portion capable of positioning the laminated state by
contacting the baffle plate 12 with the abutting portions 12a and 12c of the outer flat surface of
the other baffle plate 12 to be laminated. Provide 12b and 12d.
[0023]
According to the invention of the first aspect described above, the main body portion 14c of the
duct 14 has a substantially conical peripheral surface shape as shown in FIG. 3, whereby the duct
as a part shown in FIG. 4 (a) is obtained. A plurality of members 14 can be put together and
stacked in a stacked state as shown in FIG. 5 (b). Moreover, similarly, in the case of the baffle
plate 12 as a component in a state in which the duct 14 is attached as shown in FIG. 5 (a), a
plurality can be stacked in a stacked state as shown in FIG. 5 (b). Therefore, the packaging and
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transportability is greatly improved. Further, in this case, since no parallel surface is generated
on the inner surface of the main body portion 14c, the reflection of the sound wave is, for
example, as shown by the arrow MN in FIG.
[0024]
Further, by forming the internal opening 14a in a tapered shape, the opening area of the internal
opening 14a can be made wider. Therefore, the generation of wind noise can be prevented. In
particular, as in the present invention, when the main body portion is inclined in a substantially
conical peripheral surface shape and the inclination is narrowed from the outer opening 14b
toward the inner opening 14a as shown in FIG. If the surface is formed so as to be a vertical
surface V with respect to the axis J, the reduction of the internal opening area can not be
avoided, but if it is a tapered cut-off shape, also in such a case, FIG. A sufficient internal opening
area can be obtained as compared with the case of using the vertical surface V as shown by the
chain line.
[0025]
Furthermore, according to the second aspect of the present invention, the introduction conditions
of the sound waves to the respective ducts are made substantially the same. It is easy to make the
sound radiated from each duct identical. Furthermore, the sound quality can be adjusted by
variously changing the angle of the direction of the inner opening surface.
[0026]
Further, according to the invention of claim 3, wherein the tapered inner opening surface of the
duct is directed to the speaker unit side, among the sound waves radiated from the rear surface
of the speaker unit, the sound waves reaching the inner opening of the duct directly are It can be
efficiently taken into the duct, and the resonance component due to the reflected sound in the
enclosure can be relatively reduced.
[0027]
FIG. 8 shows the case of FIG. 7 where the duct is set to a state in which the tapered internal
opening faces 45 °, ie, the state facing the speaker unit 13, and it is directed 180 ° to 225 °
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7
different from that. The frequency characteristics and the electrical impedance are measured in
the case where the back face is turned to the speaker unit 13 (the actual measurement is
performed by the speaker of the embodiment described later).
The solid line indicates the frequency characteristic in the 45 ° state, the dotted line indicates
the frequency characteristic in the 225 ° state, and the dot-and-dash line indicates the electrical
impedance (the values are substantially the same in both the electrical impedance and the other).
[0028]
As can be seen from the figure, in the case of the 45 ° state, smooth characteristics can be
obtained in the middle band of about 500 to 3000 KHz as compared with the case of the 225 °
state. This indicates that making the tapered inner opening surface of the duct facing the speaker
unit reduces resonance due to reflection in the enclosure and contributes to improvement in
sound quality.
[0029]
Further, according to the invention of claim 4, when the main body portion 14c of the duct 14
has a substantially conical peripheral surface shape and can be stacked in a stacked state as
shown in FIG. 4 (b), handling is easy. Can be realized. That is, when simply stacking ducts having
a substantially pyramidal surface shape, one duct may be too strong to be stuck in another duct,
or it may not be pulled out, or the fitting length may be uneven to take time for packing work. As
shown in FIG. 9 (a), by providing an abutment step 14d to be in contact with the end 14e of the
main body of the other duct 14 stacked in the duct 14, as shown in FIG. 9 (a), As a result, the end
portions 14e can be stacked uniformly in the contact state of the contact step 14d, and the end
portions 14e and the contact steps 14d can not be pulled out too much.
[0030]
Furthermore, according to the present invention according to claim 5, it becomes convenient also
when laminating and packing the baffle board to which the duct was attached. That is, as shown
in FIG. 10 (b), the baffle plates 12 to be stacked come in contact with the abutting portions 12a
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and 12c and the abutted portions 12b and 12d, and the baffle plate height direction and width in
the laminated state Positioning in the direction and in the stacking direction is performed, and
the stacking and packing operations become very easy.
[0031]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 for explaining the
embodiment of the speaker according to the invention described above shows a first embodiment
of the present invention, and in particular shows a baffle plate in a state where a duct is attached
to the speaker. . 1 (a) is a front view of the baffle plate, FIG. 1 (b) is a side view of the baffle plate,
FIG. 1 (c) is a back view of the baffle plate, and FIG. (E) is a B-B sectional view, FIG. 1 (f) is a C-C
sectional view, FIG. 1 (g) is a D-D sectional view, FIG. 1 (h) is an E-E sectional view, FIG. Is a view
taken in the direction of the arrow F, FIG. 1 (j) is a view taken in the direction of the arrow G, and
FIG. 1 (k) is a cross-sectional view taken along the line HH.
[0032]
In each figure, 12 shows the whole baffle board, and a pair of ducts 141 and 142 are attached to
this baffle board 12. In the baffle plate 12, 22a is a mounting hole for a speaker unit (not shown),
and the ducts 141 and 142 are mounted so as to be located below the speaker unit mounted in
the mounting hole 22a.
[0033]
Reference numerals 22b and 22c denote boss holes for mounting the speaker front cover, the
shapes of which are shown in the sectional views of FIGS. 1 (f) and (g). Further, a projection 22d
is provided at an intermediate position between the ducts 141 and 142, and has a shape as
shown in FIG. 1 (k). Further, four insertion holes 22e are provided around the mounting holes
22a for the speaker unit as shown in the cross-sectional view of FIG. 1 (h), and are used as bolt
holes for mounting the speaker unit.
[0034]
The ducts 141 and 142 attached to the baffle plate 12 have a substantially conical peripheral
surface shape (that is, the tip of the cone has a cone shape, as can be clearly seen from FIGS. 1
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9
(b), (d) and (e). The cross-sectional area is made smaller from the outer openings 14b1 and 14b2
to the inner openings 14a1 and 14a2.
[0035]
Furthermore, the internal openings 14a1 and 14a2 are formed such that the tip of the conical
peripheral surface is cut off obliquely, and as shown in FIG. 3 (b), the central axis axes of the
main body portions 14c1 and 14c2 of the ducts 141 and 142. Is formed as a surface that is not
perpendicular.
[0036]
Moreover, as can be seen from FIG. 1 (e), the internal opening 14a1 of the duct 141 is designed
such that the opening surface as the internal opening 14a1 appears in the direction of the duct
142 which is the other duct. The opening 14a2 is designed such that an opening as the internal
opening 14a2 appears in the direction of the duct 141 which is the other duct.
[0037]
Further, at this time, as can be seen from FIGS. 1 (i) and (j) which are arrow views seen from
arrows F and G in 45 ° inclining direction in FIG. 1 (c), the internal openings 14a1 and 14a2 are
each 45 ° upward That is, it is made to be directed to the direction of the speaker unit.
That is, it is in the state described in FIG.
[0038]
By forming the ducts 141 and 142 as described above, the baffle plate 12 as a component of the
duct alone or as a component in a state in which the ducts 141 and 142 are attached is formed
by laminating a plurality of them as shown in FIGS. It can be superimposed on the condition, and
the packing and transportability is greatly improved.
Further, since no parallel surface is produced on the inner surfaces of the main body portions
14c1 and 14c2 of the ducts 141 and 142, the reflection of the sound waves is as shown by the
arrow MN in FIG.
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[0039]
When the internal openings 14a1 and 14a2 have a tapered cut-off shape, a sufficient internal
opening area can be obtained even when the main body parts 14c1 and 14c2 have a conical
peripheral surface shape as described above, and wind noise can be generated. It can be
eliminated.
[0040]
Further, since the opening surfaces of the tapered inner openings 14a1 and 14a2 face each other
in the plurality of ducts 141 and 142, the conditions for introducing the sound waves to the
ducts 141 and 142 are substantially the same. It is easy to make the sound emitted from the
same.
[0041]
Further, in this state, the opening surfaces of the internal openings 14a1 and 14a2 of the ducts
141 and 142 are directed to the speaker unit side, so that the sound waves radiated from the
rear surface of the speaker unit reach the internal openings of the ducts directly. Sound waves
can be efficiently taken into the duct, resonance components due to reflected sound in the
enclosure can be relatively reduced, and sound quality can be improved.
In particular, the characteristics in the middle range can be improved (see FIG. 8).
[0042]
For example, the sound quality can be controlled by varying the opening surfaces of the internal
openings 14a1 and 14a2 of the ducts 141 and 142 respectively within the range of 90 ° to -90
° shown in FIG. It can also be used as an adjustment means of
Also, the ducts 141 and 142 may be rotatably attached to the baffle plate 12 so that the user can
adjust the sound quality.
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[0043]
Furthermore, in the present embodiment, as can be seen from FIGS. 1 (b), (d) and (e), contact
stepped portions 14d1 and 14d2 are formed on the circumference of the main body portions
14c1 and 14c2.
The contact stepped portions 14d1 and 14d2 are formed in such a size that the peripheral
surface end portions 14e1 and 14e2 of the outer openings 14b1 and 14b2 abut, respectively.
[0044]
When the ducts 141 and 142 having a substantially conical circumferential surface shape as
parts are laminated by the contact step portions 14d1 and 14d2 and the circumferential surface
end portions 14e1 and 14e2, or as a component with the ducts 141 and 142 attached When the
baffle plate 12 is stacked, as shown in FIG. 9 (b), it can not be fitted beyond the state where the
end 14e and the contact step 14d abut, and this makes it possible to uniformly stack them. As
well as being easy to pack, the ducts are prevented from being stuck too much and coming off.
[0045]
Further, in this embodiment, as can be seen from FIGS. 1 (a), (c) and (d) in the baffle plate 12, the
contact portion 12a is provided on the front side above the mounting hole 22a of the speaker
unit. An abutted portion 12b is formed on the back side.
Further, an abutting portion 12c is provided on the front side which is below the mounting hole
22a of the speaker unit, and an abutted portion 12d is formed on the rear side correspondingly.
[0046]
Thus, when stacking and packing the baffle plate 12 (or the baffle plate 12 in a state in which the
ducts 141 and 142 are not attached) to which the ducts 141 and 142 are attached, as shown in
FIG. As schematically shown, the baffle plates 12 to be stacked contact each other with the
contact portions 12a and 12c and the contact portions 12b and 12d, so that the baffle plate
height direction, width direction, and the like in the stacked state. And positioning in the stacking
direction is performed, and the stacking and packing operations become very easy.
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12
[0047]
FIG. 2 shows a second embodiment of the present invention, and in the same manner as FIG. 1 as
the first embodiment, particularly a baffle plate in a state in which a duct is attached in a speaker.
[0048]
2 (a) is a front view of the baffle plate, FIG. 2 (b) is a side view of the baffle plate, FIG. 2 (c) is a
back view of the baffle plate, FIG. 2 (d) is a plan view of the baffle plate, FIG. (E) is an A-A
sectional view, FIG. 2 (f) is a B-B sectional view, FIG. 2 (g) is a C-C sectional view, FIG. 2 (h) is a DD sectional view, FIG. 2 (j) is an F-F cross-sectional view, FIG. 2 (k) is a G arrow view, and FIG. 2 (l)
is an H arrow view.
The same reference numerals are given to the same parts (same functional parts) as those of the
above embodiment, and the parts not directly related to the present invention are only shown in
the drawings, and the detailed description will be omitted.
[0049]
Also in this embodiment, as can be seen from FIGS. 2 (b), (e), (d) and (f), in the ducts 141 and
142, the main body portions 14c1 and 14c2 have a substantially conical peripheral surface
shape, and the inside from the outer openings 14b1 and 14b2 The cross-sectional area is formed
to be smaller over the openings 14a1 and 14a2, and the internal openings 14a1 and 14a2 are
formed such that the tip of the cone is cut off obliquely, and the ducts 141, It is formed as a
surface which is not perpendicular to the central axes of the main body portions 14c1 and 14c2
of 142.
[0050]
Then, as can be seen from FIGS. 2 (d) and 2 (f), the internal opening 14a1 of the duct 141 is
designed such that the opening surface as the internal opening 14a1 appears in the direction of
the duct 142 which is the other duct. The internal opening 14a2 of 142 is designed such that the
opening surface as the internal opening 14a2 appears in the direction of the duct 141 which is
the other duct.
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In particular, as can be seen from FIGS. 2 (k) and 2 (l) which are viewed from arrows F and G
which are 45 ° inclining directions in FIG. 2 (c), the internal openings 14a1 and 14a2 are each
45 ° upward. It is made to be directed in the direction of a certain speaker unit.
[0051]
Further, as can be seen from FIGS. 2 (b) (d) (e) (f) (k) (l), contact stepped portions 14d1 and 14d2
are formed on the circumference of the main body portions 14c1 and 14c2, respectively. The
contact stepped portions 14d1 and 14d2 are formed in such a size that the peripheral surface
end portions 14e1 and 14e2 of the outer openings 14b1 and 14b2 abut, respectively.
[0052]
As described above, by forming the ducts 141 and 142, as in the first embodiment, a plurality of
layers are stacked in a stacked state, and the packaging property and the transportability are
greatly improved, and the handling becomes easy and unnecessary. It is also possible to obtain
the sound quality improvement effect by eliminating resonance noise and eliminating wind noise.
[0053]
Also in this embodiment, as in the first embodiment, as shown in FIGS. 2 (a), (c) and (e), the baffle
plate 12 is located on the front side above the mounting hole 22a of the speaker unit. An
abutting portion 12 a is provided, and an abutted portion 12 b is formed on the back surface side
correspondingly.
Further, an abutting portion 12c is provided on the front side below the mounting hole 22a of
the speaker unit, and an abutted portion 12dA is formed on the rear side correspondingly.
However, in this case, unlike the first embodiment, the abutted portion 12dA is provided in a
tapered manner.
[0054]
Also in this embodiment, when the baffle plates 12 are stacked and packaged, positioning in the
baffle plate height direction, width direction, and stacking direction is performed in the stacked
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14
state, and the stacking and packing work is very easy. However, since the abutted portion 12dA
is tapered, it also has an advantage of preventing rattling in the stacked state.
[0055]
Although the speaker provided with the pair of ducts 141 and 142 is given as an example, the
present invention can be adopted even if it is a speaker having a single duct or plural pairs of
ducts.
Furthermore, the positions, the number, the shapes, etc. of the contact stepped portion 14d and
the circumferential surface end 14e in the duct, and the contact portions 12a and 12c and the
abutted portions 12b and 12d in the baffle plate are limited as in the embodiment. It is not a
thing.
[0056]
In addition, various other shapes of the duct having a substantially conical peripheral surface or
a substantially pyramidal peripheral surface shape and in which the internal opening has a
tapered cut-off shape are conceivable.
[0057]
For example, as shown in FIG. 11, it is also conceivable that the main body portion 14c has a
conical peripheral surface shape in which the cross-sectional area becomes wider from the outer
opening 14b to the inner opening 14a.
Further, as shown in FIG. 12, the main body portion 14c has a conical peripheral surface shape in
which the cross-sectional area becomes wider from the outer opening 14b to the inner opening
14a, and further the inner opening 14a is cut in a curved shape. May be
However, in the case of these shapes, although it becomes impossible to stack when the ducts 14
are attached to the baffle plate 12, it is possible to stack at the component stage of only the
baffle plate 14. In this case, although not shown, when the contact stepped portion is provided
on the circumferential surface of the main body to improve handling at the time of stacking as in
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15
the above embodiment, the contact stepped portion is not the external opening 14b side. It is
needless to say that it is formed to be in contact with the circumferential end of the inner
opening 14a.
[0058]
Further, as shown in FIG. 13, the inner surface and the outer surface of the main body portion 14
c may be curved, and may have a substantially conical peripheral surface shape. Further, as
shown in FIG. 14, the internal opening 14a is not entirely tapered off, but a part of the internal
opening 14a is cut off and a surface 14aV perpendicular to the central axis of the main body 14c
as an internal opening surface. It may be formed by a plurality of surfaces 14aT to be
perpendicular. That is, a part of the inner opening 14a is a non-perpendicular surface to the
longitudinal axis of the duct. Even in this case, the opening area can be increased.
[0059]
Of course, not only the above modified example, but also various shapes can be considered as the
duct 14 within the scope of the present invention.
[0060]
In FIG. 15, although the main body portion 14c is not formed in the shape of a peripheral surface
of a cone, an example in which a non-perpendicular surface is formed by taper cutting off a
portion (though of course all may be sufficient) increase.
Although this does not show the advantage of making it possible to stack, it is useful when it is
desired to eliminate the wind noise and to adjust the sound quality by setting the sound wave
intake direction (direction of the tapered opening surface). It is.
[0061]
As described above, in the loudspeaker according to the present invention, the main body of the
duct has a substantially conical peripheral surface shape, and the internal opening has a tapered
cut-off shape to obtain a sufficient opening area. As a result, it is possible to obtain the effects of
improving the packing performance by the plurality of layers, improving the transportability, and
improving the sound quality by preventing air column oscillation and wind noise.
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16
[0062]
Furthermore, when a plurality of ducts are mounted on the speaker, the introduction conditions
of the sound waves to the respective ducts are substantially the same by configuring the tapered
inner opening faces of the ducts to face each other at the same angle. There is an effect that the
sound radiated from each duct is made the same and the sound quality is improved.
Here, there is also an advantage that the sound quality can be controlled by setting the direction
of the inner aperture.
[0063]
Further, by configuring the tapered inner opening surface of the duct to face the speaker unit
side, among the sound waves radiated from the rear surface of the speaker unit, the sound waves
directly reaching the inner opening of the duct are efficiently taken into the duct Therefore, the
resonance component due to the reflected sound in the enclosure can be relatively reduced, and
the sound quality can be improved.
[0064]
In addition, when a plurality of ducts are stacked on the outer peripheral surface of the main
body of the duct, positioning of the stacked state and deep stacking can be performed by
providing a contact step that contacts the end of the inner cylindrical surface of the stacked duct.
Thus, it is possible to prevent the resin from coming off too hard, and to realize easy handling
when stacking in the laminated state.
[0065]
Furthermore, when a plurality of baffle plates are stacked, an abutted portion capable of
positioning in a stacked state can be provided in contact with the contact portion of the outer flat
surface of the baffle plate to be stacked when plural baffle plates are stacked. As a result, the
baffle plates to be stacked come in contact with each other and the abutted portions come into
contact with each other, and positioning in the height direction, width direction, and stacking
direction in the stacked state is performed. Be easy to
17-04-2019
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