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JP2017163515

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DESCRIPTION JP2017163515
Abstract: A baffle effect can be almost eliminated while maintaining good characteristics of a
back load horn type, and sound volume localization with high sound quality and good sound
image localization can be performed. In addition, it offers a speaker box that can be easily
installed in narrow rooms because of its short depth. SOLUTION: A spiral partition plate
extending from the central portion to the outer edge side of the main box in the height and width
plane is provided inside the three-dimensional main box having height and width and depth
shorter than the height and width. A main horn formed by providing a central side opening and
an outer side opening open to the outside at the central portion and the outer edge of the main
box, and communicating with the central side opening and the height of the main box And an
auxiliary box provided along a surface in the width direction, the auxiliary box being disposed on
the upper surface on the depth side of the main box and having a speaker to be attached, and the
main box from the cavity It has a proximal horn portion extended along the outer surface of the
body to a position covering the central opening. [Selected figure] Figure 1
Speaker box
[0001]
The present invention relates to a speaker box, in particular to a backload type.
[0002]
Among the speaker systems used for audio is the back load horn type.
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1
This system is high in efficiency, and a wide band can be covered by one full-range speaker unit,
so that it has a characteristic that sound image localization is good and high sound quality can be
obtained especially at small volume and close listening.
[0003]
However, since it has a structure in which a long sound path is bent, in general, the depth is long,
and there is a problem that it is necessary to devise installation in a narrow room. Therefore, as
shown in FIG. 7, a spiral horn type in which a spiral sound path 51 is provided inside the box 50
has been proposed as a device for reducing the depth. In this type, a cavity 53 is provided on the
start end side of the sound path 51, and a speaker unit 52 is provided in the cavity 53. On the
outer peripheral side 55 of the sound path 51, a partition plate 56 for forming a 180-degree bent
side sound path is first provided, and the tip of the partition plate 56 is an opening 57.
[0004]
The sound pressure from the speaker unit 52 passes through the arrow 54 to reach the arrow
58, and is finally emitted from the opening 57. However, in this type, since the speaker unit 52 is
located at the approximate center of the baffle 53, a baffle effect occurs, and sound image
localization degradation associated with this is inevitable (Non-Patent Document 1). Therefore, in
order to reduce the baffle effect, a format as shown in FIG. 8 has been proposed (Non-Patent
Document 2).
[0005]
As shown in FIG. 8, the pipe-like sound path 62 extends from the small cavity portion 61 to
which the speaker unit 60 is attached, and is connected to the horn portion 63 in which the base
end of the sound path 62 is formed into a cube. Since there is almost no baffle effect around the
speaker unit, good sound image localization can be obtained.
[0006]
However, in this method, since the horn portion 63 which also serves as a speaker base has a
cubic shape, the bottom area becomes large, and the installation position is restricted.
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In addition, it may be difficult to replace or add to an existing system because the shape is
relatively unique. By the way, it is conceivable to enjoy various timbres by exchanging units in
the speaker system.
[0007]
However, since different speakers have different characteristics, it may be necessary to strictly
change the cross-sectional area of the throat. However, in the prior art, the cross-sectional area of
the throat portion can not be changed, or even if it is possible, the replacement of the speaker
unit and the cross-sectional area change must be performed independently, and none can be
performed simultaneously. The
[0008]
Nagaoka Tetsuo Speaker Works Complete Drawing Collection 1: 116 Page: ISBN 4-276-24031-X
[0009]
Masterpiece of Back Road: page 107: ISBN 4-276-24035-2
[0010]
As described above, all of the back load horn type speaker systems described above have merits
and demerits, and sound image localization is good, and even in a narrow room, there is no one
that can be easily installed.
Therefore, an object of the present invention is to provide a speaker box that satisfies the
following requirements.
First, while maintaining the good characteristics of the back load horn type, the baffle effect can
be almost eliminated and sound image localization is good and high sound quality small volume
reproduction can be performed. Second, the installation in a narrow room is easy because the
depth is short. Thirdly, it can be made similar in appearance to a cubic speaker and can be
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installed without discomfort with other devices. Fourth, replacement of the speaker unit and
cross-sectional area setting of the throat can be performed at the same time, and various sound
quality can be easily enjoyed.
[0011]
In order to solve the above problems, the present invention includes the following specific items
of the invention. Inside the three-dimensional main box with height and width and depth smaller
than the height and width, a spiral partition plate is provided from the central part to the outer
edge side of the main box in the height and width plane. A main horn formed by providing a
central side opening and an outer edge side opening opened to the outside to the central portion
and the outer edge side respectively, and communicating with the central side opening and the
height and width direction of the main box And an auxiliary box provided along the surface.
[0012]
The auxiliary box body is disposed on the upper surface on the depth side of the main box body,
and extends from the cavity portion to a position covering the central opening along the outer
surface of the main box body from the cavity portion It has a proximal horn that is Thereby, the
sound pressure by the speaker is configured to be radiated from the proximal end horn portion
to the outer edge side opening through the central opening and the main horn.
[0013]
As described above, since the cavity portion is disposed on the upper surface on the depth side of
the main box body, there is almost no baffle effect and sound image localization becomes good.
An auxiliary sound path for extending the main horn can be formed between the end of the spiral
partition plate and the outer opening. This auxiliary sound path can be formed by a partition
plate or the like, and can be expanded from one stage to about five stages. Further, the auxiliary
box body can be formed of a material selected from wood material, synthetic resin, metal,
sintered earth, glass, ceramics, or a composite thereof. By using a composite material, the
resonance frequency can be dispersed and the sound quality unique to the material can be
enjoyed. Further, the speaker mounting surface of the auxiliary box body is formed separately as
a detachable member, and the speaker mounting surface is projected to a position corresponding
to the start end of the base end horn portion to make the sound at the start end of the base end
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horn portion A throat area setting body can be provided which reduces the cross-sectional area
of the road arbitrarily.
[0014]
Since the speaker unit and the throat area setting body are integrally attached to the back of the
speaker mounting surface, this can be replaced as an assembly, and the throat area setting can
be performed simultaneously according to the characteristics of the speaker unit.
[0015]
According to the present invention, since the area of the baffle is equivalent to the area of the
cavity, the baffle effect hardly occurs, and in the entire shape, the depth is the shortest and
installation in a narrow room is easy. .
The good transient characteristics of the back load horn type are maintained, so small volume
reproduction or only the small cavity portion projecting as a whole can be made to look similar
to a general speaker and can be made with other devices. It can be installed without discomfort.
Fourth, replacement of the speaker unit and cross-sectional area setting of the throat can be
performed simultaneously, and it is possible to easily enjoy various sound quality.
[0016]
It is a perspective view which shows the whole of the speaker box concerning Embodiment 1 of
this invention. It is a perspective view which shows the internal structure of the speaker box
concerning Embodiment 1 of this invention. It is a disassembled perspective view which shows
the principal part of the box for speakers which concerns on Embodiment 1 of this invention. It is
a perspective view which concerns on Embodiment 2 of this invention. It is a perspective view
which concerns on Embodiment 3 of this invention. It is sectional drawing of the principal part
which concerns on Embodiment 4 of this invention. It is a perspective view which shows the
conventional speaker system. It is a perspective view which shows the conventional speaker
system.
[0017]
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Hereinafter, the present invention will be described in detail with reference to the drawings.
(Aspect 1 of the embodiment)
[0018]
Embodiment 1 is shown in FIGS. 1 to 3. FIG. 1 is a perspective view of the whole, partially cut
away to show the internal structure. 1 shows a main box. The main box body 1 is configured in a
solid having a height and a width and a depth smaller than the height and the width. The ratio of
height width to depth is about 10: 4: 2, and it is formed in a hexahedron consisting of front plate
2, side plate 3, top plate 4, back plate 5 and bottom plate 6 as height and width. There is. An
outer edge side opening 9 communicating with the inside is formed at the lower part of one side
plate 3. The inside of the main box 1 is structured as shown in FIG. FIG. 2 is a view of FIG. 1 as
viewed from the back. A central side opening is provided with a spiral partition 7 extending from
the center slightly above the main box body 1 to the outer edge side (side plate 3) to the outside
at the center and outer edge side slightly above the front plate 2 The part 8 is formed. The spiral
partition plate 7 is disposed so that the cross-sectional area is expanded while bending a large
number of plates every 90 degrees, and the enlargement ratio is approximated to an exponential
curve and the main horn portion 10 Are configured.
[0019]
An auxiliary sound path 12 for extending the main horn portion 10 is formed between the end
11 of the spiral partition plate 7 and the outer opening 9. The auxiliary sound path 12 is formed
by two auxiliary partition plates 13 and 14 extending alternately from the side plates 3 and is
communicated with the main horn portion 10 to enlarge the area of the horn. The auxiliary
partition plate 14 is connected to the upper edge of the outer opening 9 to substantially
constitute the outlet of the horn. A reinforcing plate 15 for connecting and reinforcing the front
plate 2 and the back plate 5 is provided inside the outer opening 9.
[0020]
An auxiliary box body 20 is provided to cover a part of the front plate 2 and the top plate 4. The
auxiliary box body 20 communicates with the cavity 21 provided to be placed on the upper
surface of the upper surface plate 4 and the central opening 8 and along the surface of the main
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box body 1 in the height and width directions. It is comprised from the proximal end horn part
22 provided. The cavity portion 21 and the base end horn portion 22 are integrally formed, and
are composed of a detachable speaker mounting surface 23, a side plate 24, an upper plate 25, a
lower plate 26, and a back plate 27. As shown in FIG. 3, the side plate 24 has a shape in which a
narrow portion is extended from the wide portion, and the inside is sealed in a state of being
attached to the main box 1. That is, the lower surface of the cavity portion 21 and the back
surface of the base end horn portion 22 are opened to the outside in the auxiliary box 22 alone,
and when the auxiliary box 22 is attached to the front plate 2 and the upper plate 4, the inside is
the central side opening It will be in the state connected to the part 8.
[0021]
The central opening 8 is adjacent to the start end 7 a of the partition plate 7, and all the pressure
of the cavity 21 is sucked and discharged through the central opening 8. The speaker mounting
surface 23 is detachable as shown in FIG. 3, and six mounting holes 28 for fastening to the side
plate 24, the upper plate 25 and the lower plate 26 are formed. On the other hand, a holder 29 is
provided inside the side plate 24, the upper plate 25 and the lower plate 26, and a screw hole 30
corresponding to the mounting hole 28 is formed in the holder 29. The speaker mounting
surface 23 is provided with holes 31 for mounting the speaker units 32, and various speaker
units 32 are previously mounted on the speaker mounting surface 23 so that they can be freely
attached and detached.
[0022]
A throat area setting member 33 is provided on the back surface of the speaker mounting
surface 23 so as to project to a position corresponding to the start end of the proximal end horn
portion 22 and optionally reduce the cross-sectional area of the sound path at the start end of
the proximal end horn portion 22. It is provided. The throat area setting member 32 is formed in
a triangular prism shape, and partially closes the sound path at the start end of the proximal
horn portion 22 to change the throat area. By using this throat area setting body 33, it is possible
to make the shape of the rectangular throat closer to a square, thereby improving the sound
quality, and the throat area to be set by the speaker unit used is the throat area setting body 33.
It can be set arbitrarily by changing the width
[0023]
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Therefore, by preparing the throat area setting member 33 optimally set for each speaker unit
and attaching it to the speaker mounting surface 23, it is possible to preset the cross-sectional
area of the sound path. With the above configuration, the sound pressure arrow F by the speaker
is radiated from the proximal horn portion 22 to the outer edge opening 9 through the central
opening 8, the main horn 10 and the auxiliary sound path 12. At this time, when looking at the
entire sound path, the sound wave is structured to extend from the proximal end horn portion 22
which is a straight pipe through the main horn portion 10 which is bent 90 degrees to the
auxiliary sound path 12 which is bent 180 degrees. As a result, three types of sound paths
having different characteristics have an effect of canceling the unevenness of the frequency
characteristics, and good sound quality can be obtained. In addition, the speaker box has a
characteristic suitable for so-called near-field listening where the distance to the ear is about 1 m.
This is due to the shape of the speaker mounting surface 23 including the base end horn portion
22 protruding from the main box.
[0024]
Although three auxiliary sound paths 12 are provided to extend the sound path in this
embodiment, the number of stages can be arbitrarily set according to the desired minimum
reproduction frequency. In general, it is desirable to set short (no number of stages or about 2
meters in total length in one step) for small diameter speakers of about 8 cm, and to set three or
more steps for medium diameter speakers exceeding 12 cm. (Embodiment 2 of the embodiment)
[0025]
FIG. 4 shows that the main horn portion 10 is formed into a smooth circular spiral shape by
synthetic resin molding or the like. And along the main horn portion 10, the upper portion of the
main box 1 was also formed in a circular shape. The upper surface of the cavity 21 is also formed
in a semi-cylindrical shape by using a circular speaker unit 32 as well. In this embodiment, the
baffle area can be further reduced and the design can be made excellent. (Aspect 3 of the
embodiment)
[0026]
FIG. 5 shows an embodiment for maximizing the sound path length, in which the base horn
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8
portion 22 is extended downward by setting the top and bottom of the main box body 1 in
reverse. In this example, the outer opening 9 is located at the top. By extending the base end
horn portion 22, the speaker mounting surface 23 also becomes long, which is inconvenient for
replacing the speaker unit, which is divided up and down, and the side near the central opening 8
is used as a fixing plate 23a, which is detachable The size of the speaker mounting surface 23
was made the same size as that of the embodiment 1 for compatibility. In this structure, it is
possible to correct the frequency characteristics by installing a tweeter (not shown) on the upper
surface of the cavity 21 as necessary since the lowest reproduction frequency in the low band
can be lowered with the extension of the sound path. (Aspect 4 of the embodiment)
[0027]
In this embodiment, the auxiliary box 20 is formed by synthetic resin molding and can be formed
into an arbitrary shape so that it can be made acoustically excellent. FIG. 6 shows an egg-shaped
cavity advantageous for sound image localization, in which a hole 31 for attaching the speaker
unit 32 is provided on the gentle side of the curved surface of the egg. Then, the proximal end
horn portion 22 molded into a teardrop shape from the egg-shaped cavity portion 21 is
integrally molded, and the lower end of the proximal end horn portion 22 is communicated with
the central opening 8.
[0028]
A mounting foot 34 is extended on the lower surface of the cavity 21 so as to be able to be firmly
connected to the main box 1. As the material of the auxiliary box body 20, in addition to
synthetic resin, wood material, metal, sintered earth, glass, ceramics, etc. can be used. In addition,
it is possible to improve the vibration characteristics by mixing metal powder, shells and the like
into the synthetic resin.
[0029]
Reference Signs List 1 main box body 2 front plate 3 side plate 4 upper plate 5 back plate 6
bottom plate 8 center side opening 9 outer edge side opening 10 main horn 12 auxiliary sound
path 13 auxiliary partition 20 auxiliary box 21 cavity 22 base End horn 23 Speaker mounting
surface 32 Speaker unit 33 Throat area setting body
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