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JP3165148

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DESCRIPTION JP3165148
Abstract: [Problem] To propose a compact and compact back load horn type speaker in which a
back load horn having a sufficient length is formed by effectively utilizing the internal space of a
speaker box. In the back load horn type speaker 1, the inside of the speaker box 2 is divided into
a plurality of compartments 23 to 25 in the width direction, and on the upstream side of the back
load horn 20 extending in each of the compartments 23 to 25 vertically and longitudinally. The
throat portion 26, the middle throat portion 26, and the downstream side throat portion 27 are
formed, and they are communicated in the width direction via the communication ports 29a and
29b to constitute one back load horn 20. Since a back load horn is configured by communicating
the throat portions extending in the front, rear, up and down directions in the width direction, a
sufficiently long back load horn can be configured inside the limited speaker box, and the
speaker box becomes larger The sound effects in the low range can be improved without causing
[Selected figure] Figure 2
Back load horn type speaker
[0001]
The present invention relates to a back load horn type speaker in which a sufficiently long back
load horn formed according to an exponential curve is formed inside a speaker box.
[0002]
Speakers are known which have a back-loaded horn formed according to an exponential curve
inside the speaker box in order to improve the acoustic properties of the bass region.
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In patent document 1, in order to be able to assemble easily the speaker box in which the back
load horn was formed, two or more intermediate plates of fixed thickness which cut out the bent
sound path are laminated, and it is pinched by a side plate from both sides. Thus, it has been
proposed to constitute a back load horn bent in the front and back, up and down directions in the
box. Patent Document 2 discloses a configuration provided with a back load horn that is bent in
the vertical direction along the width direction in a speaker cabinet.
[0003]
JP, 2003-204586, A JP, 2008-278229, A
[0004]
In back-loaded horn speakers, it is desirable to form a sufficiently long back-loaded horn in the
speaker box according to the exponential curve.
However, if it is attempted to form a backload horn of sufficient length in the speaker box, the
box size becomes large, which is a disadvantage for making the speaker compact and compact.
[0005]
An object of the present invention is, in view of this point, to propose a compact and compact
backload horn-type speaker in which a sufficiently long backload horn is formed.
[0006]
In order to solve the above-mentioned problems, the back load horn type speaker (1) of the
present invention comprises: a longitudinally elongated rectangular tubular speaker box (2); and
a central upper portion of a front plate (5) of the speaker box (2) A central emission opening (11)
extending forward, a speaker unit (12) located at the center of the central emission opening (11),
and forward on both sides of the front plate (5) of the speaker box (2) In the inside of the
speaker box (2) to guide the left and right radiation ports (13, 14) that are open and the sound
emitted backward from the speaker unit (12) to the left and right radiation ports (13, 14) The
speaker box (2) has a pair of back load horns (20, 30) formed in a symmetrical state, and the
internal space of the speaker box (2) is the front plate of the speaker box (2). ) And the back plate
(8), and a pair of first vertical partitions (21), and the first vertical partitions (21) and left and
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right side plates (6, 7) of the speaker box (2) A first compartment (23) formed at the center in the
width direction by a pair of second vertical partitions (22) bridged between the front plate (5)
and the back plate (8) between A pair of second compartments (24) formed symmetrically on
both sides and a pair of third compartments (25) formed symmetrically on both sides thereof; In
the compartment (23), a common upstream throat portion (26) that constitutes the upstream
side portion of each backload horn (20, 30) is formed, and in each of the second compartments
(24) Is the upstream throat portion of each of the back load horns (20, 30) An intermediate
throat (27) communicating with the downstream end (26h) of 26) is formed in each of the third
compartments (25), the intermediate throat of each of the back load horns (20, 30) A
downstream throat (28) in communication with the downstream end (27b) of the part (27) is
formed, and each downstream end (28b) of the downstream throat (28) has a corresponding
radiation port (13). , 14) in communication with each other.
[0007]
Here, the upstream throat portion (26) meanders up and down and back and forth from the
upstream end (26a) facing the rear end (12b) of the speaker unit (12) in the first compartment
(23) It can be formed to extend toward the downstream end (26h) located at the bottom front
end side portion of the first compartment (23).
In this case, the middle throat portion (27) is upstream through the first communication port
(29a) formed at the lower end portion of the front end of the first vertical partition (21) in the
second compartment (24). The upstream end (27a) in communication with the downstream end
(26h) of the side throat portion (26) is formed to extend obliquely upward from here toward the
downstream end (27b) facing the back plate (8) do it.
Further, the downstream side throat portion (28) is provided with an intermediate throat portion
(27) through the second communication port (29b) formed at the rear end of the second vertical
partition (22) in the third compartment (25). And the upstream end (28a) in communication with
the downstream end (27b) of the), and it may be formed so as to extend horizontally forward to
the radiation ports (13, 14) from here.
[0008]
In the back load horn type speaker according to the present invention, the interior of the speaker
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box is divided into a plurality of compartments in the width direction, and in each compartment,
throat portions extending vertically or longitudinally are formed, and these throat portions are
communicated with each other. It constitutes the back load horn. Unlike the case of forming a
back load horn extending in the front and rear direction or the case of forming a back load horn
extending in the width direction in the speaker box, in the present invention, a plurality of throat
portions extending in the front and rear direction are widthwise As a single back load horn is
constructed by connecting to the above, a sufficiently long back load horn can be formed inside
the limited speaker box. Therefore, the sound effect in the low frequency range can be improved
without increasing the size of the speaker box.
[0009]
It is a top view, a front view, a bottom view, a right side view and a back view showing a back
load horn type speaker to which the present invention is applied. (A) is a front view of the back
load horn type speaker of FIG. 1, (b) is its cross-sectional view, (c1) to (e1) are respective
longitudinal cross sections to show the back load horn on the left side (C2) to (e2) are
explanatory views showing respective longitudinal sections expanded on a plane to show the
back load horn on the right side thereof. f) is an explanatory view showing an exponential curve
of a back load horn. It is a top view which shows the inner surface and upstream throat part of
the 1st perpendicular ¦ vertical partition plate of the back load horn type speaker of FIG. It is a
top view which shows the outer surface and the middle throat part of the 1st perpendicular ¦
vertical partition plate of the back load horn type speaker of FIG. It is a top view which shows the
outer surface and downstream side throat part of the 2nd perpendicular ¦ vertical partition plate
of the back load horn type speaker of FIG.
[0010]
Hereinafter, an embodiment of a back load horn type speaker to which the present invention is
applied will be described with reference to the drawings.
[0011]
The entire configuration of the back load horn speaker according to the present embodiment will
be described with reference to FIG.
The back load horn type speaker 1 is provided with a vertically elongated rectangular tubular
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speaker box 2, and the speaker box 2 is configured from a top plate 3, a bottom plate 4, a front
plate 5, left and right side plates 6, 7 and a back plate 8. A rectangular base frame 9 is attached
to the back surface of the bottom plate 4. A central radiation port 11 is formed in the upper
portion of the front plate 5, and a speaker unit 12 is attached forward in the back. The front plate
5 is narrower than the distance between the left and right side plates 6, 7, and the front end
edges of the left and right side plates 6, 7 are positioned rearward of the front plate 5, and
between them, the front and side openings are opened. The left and right radiation ports 13, 14
are formed. Three horizontal connection plates 15 are attached to the left and right radiation
ports 13 and 14 at equal intervals in the vertical direction.
[0012]
Next, the internal structure of the speaker box 2 will be described with reference to FIG. Inside
the speaker box 2, a pair of left-right symmetrical pair for guiding the sound emitted rearward
from the rear end of the speaker unit 12 to the left and right radiation openings 13, 14 opened
to the left and right of the front of the speaker box 2 The back load horns 20, 30 are formed.
These back load horns 20, 30 are formed by dividing the internal space of the speaker box 2. In
the following description, since the back load horns 20 and 30 on either side are symmetrical
shape, the corresponding part is demonstrated using the same code ¦ symbol.
[0013]
That is, inside the speaker box 2, a pair of first vertical partition plates 21 having a symmetrical
shape is bridged in parallel between the front plate 5 and the back plate 8 of the speaker box 2.
Further, also between the left and right first vertical partition plates 21 and the left and right side
plates 6, 7, between the side edge of the front plate 5 and the back plate 8, a pair of second
vertical shapes having a symmetrical shape. The partition plates 22 are bridged in parallel. As a
result, the inside of the speaker box 2 is positioned on both sides of the first compartment 23
having a constant width located at the center in the width direction, the second compartment 24
having the same width on both sides, and the same width. It is divided into left and right third
compartments 25 of the same width.
[0014]
The central first compartment 23 is formed with a common upstream throat portion 26 which
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constitutes an upstream portion of each of the back load horns 20 and 30. Each of the second
compartments 24 is formed with an intermediate throat portion 27 communicating with the
downstream end of the upstream throat portion 26 of each of the back load horns 20 and 30.
Further, in each of the third compartments 25, a downstream side throat portion 28 in
communication with the downstream end of the middle throat portion 27 of each of the back
load horns 20, 30 is formed. The downstream end of each of the downstream throat portions 28
opens forward and laterally through the corresponding left and right radiation ports 13 and 14,
respectively.
[0015]
FIG. 3 is an explanatory view showing the inner surface of the first vertical partition 21 on the
left side and the upstream throat portion 26 of the first compartment 23. Referring to FIGS. 2
and 3, in the first compartment 23, the front vertical partition plate 31, the rear vertical partition
plate 32, the upper inclined plate 33, and the middle partition plate are disposed between the left
and right first vertical partition plates 21. The inclined plate 34 and the lower inclined plate 35
are bridged. The upstream side throat part 26 is formed of these boards 31-35.
[0016]
That is, the upstream throat portion 26 extends downward along the front surface of the front
vertical partition plate 31 from the upstream end 26 a facing the rear end 12 b of the speaker
unit 12 in the first compartment 23 and the downward passage portion 26 b An upward passage
portion 26c bent and extended upward from the lower end between the vertical partitions 31,
32; a downward passage portion 26d extending downward from the upper end between the rear
vertical partition 32 and the back plate 8; And a forward passage portion 26e extending slightly
upward between the upper inclined plate 33 and the intermediate inclined plate 34 toward the
front, and bent rearward from the front end between the intermediate inclined plate 34 and the
lower inclined plate 35 A rearward facing passage portion 26 f extending rearward and inclined
downward, and a forward facing passage portion passing from the rear end through the space
between the lower sloping plate 35 and the bottom plate 4 and advancing forward And a 26g.
[0017]
Thus, the upstream throat portion 26 is formed in the first compartment 23 from a passage that
meanders up and down and back and forth.
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Further, at the bending position of each passage portion, guide plates 36a to 36h are attached
such that the bending angles on the outside of those portions become obtuse. In addition, a
rectangular notch is formed in the lower end portion of the front end of the first vertical partition
21 where the downstream end 26h of the forward passage portion 26g of the upstream throat
portion 26 is located, and this is the upstream throat portion. A first communication port 29 a
communicates in the width direction between the downstream end of the H.26 and the upstream
end of the middle throat portion 27. Although the width dimension of each portion of the
upstream throat portion 26 is the same, the height dimension in the vertical direction thereof
gradually increases from the upstream end to the downstream end, and the exponene shown in
FIG. The cross-sectional area along the Char curve is gradually increasing.
[0018]
FIG. 4 is an explanatory view showing the outer surface of the first vertical partition 21 and the
middle throat portion 27 of the second compartment 24. As shown in FIG. Referring to FIGS. 2
and 4, in the second compartment 24, an upper inclined plate 41 and a lower inclined plate 42
are bridged between the first vertical partition 21 and the second vertical partition 22. ing. The
inclined plates 41, 42 extend from the upper and lower ends of the first communication port 29a
formed at the lower end portion of the front end of the first vertical partition 21 to the back plate
8 obliquely upward. . An intermediate throat portion 27 is formed between the inclined plates 41
and 42. Although the width dimension of the middle throat portion 27 is the same, the height
dimension in the vertical direction gradually increases from the upstream end 27a to the
downstream end 27b, and along the exponential curve shown in FIG. 2 (f) The cross-sectional
area is gradually increasing.
[0019]
FIG. 5 is an explanatory view showing the outer surface of the second vertical partition plate 22
and the downstream side throat portion 28 of the third compartment 25. The rear end edge of
the second vertical partition plate 22 is cut out with a constant width between the portions
where the rear ends of the upper and lower inclined plates 41 and 42 defining the middle throat
portion 27 are located. A second communication port 29b communicates the downstream end
27b of the middle throat portion 27 and the upstream end 28a of the downstream throat portion
28 in the width direction.
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[0020]
Between the second vertical partition plate 22 and the left and right side plates 6, 7, in the state
of vertical symmetry, it is slightly curved in the vertical direction and extends forward from the
upper and lower ends of the second communication port 29b. An upper partition plate 51 and a
lower partition plate 52 are bridged. The front ends of the upper partition plate 51 and the lower
partition plate 52 are connected to the upper edge portions of the left and right radiation ports
13 and 14. Between these, a downstream throat portion 28 in which the upstream end 28a of the
rear end communicates with the second communication port 20b and the downstream end 28b
of the front end communicates with the radiation ports 13 and 14 is formed. In the downstream
throat portion 28, the width dimension of each portion is the same, but the height dimension in
the vertical direction gradually increases from the upstream end 28a to the downstream end
28b, and the expo shown in FIG. The cross section increases gradually along the critical curve.
[0021]
In this manner, the left and right back load horns 20, 30 of the present example are throats
directed forward or backward into the plurality of compartments 23, 24, 25 divided in the width
direction inside the speaker box 2. A portion is formed, and throat portions 26 to 28 formed in
each of the compartments 23 to 25 are sequentially connected outward from the center side in
the width direction to constitute one back load horn. Therefore, in the internal space of the
speaker box 2, the back load horns 20 and 30 having a sufficient length to effectively utilize the
internal space of the speaker box 2 as compared to the back load horn extending simply in the
front-rear direction or width direction You can get
[0022]
DESCRIPTION OF SYMBOLS 1 back load horn type speaker 2 speaker box 3 top plate 4 bottom
plate 5 front plate 6, 7 side plate 8 back plate 9 base frame 11 center radiation port 12 speaker
unit 13 14 radiation port 15 horizontal connection plate 20, 30 back load horn 21 First vertical
partition 22 second vertical partition 23 first compartment 24 second compartment 25 third
compartment 26 upstream throat portion 26a upstream end 26b downward passage portion 26c
upward passage portion 26d downward passage portion 26e forward passage portion 26f
Backward passage portion 26g Forward passage portion 26h Downstream end 27 Intermediate
throat portion 27a Upstream end 27b Downstream end 28 Downstream side throat portion 28a
Upstream end 28b Downstream end 29a First communication port 29b Second communication
port 31 Front vertical partition plate 32 Rear vertical Partition plate 33 Upper inclined plate 34
Middle inclined Plate 35 the lower inclined plate 36a˜36h guide plate
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