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JP2008278192

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DESCRIPTION JP2008278192
An adapter for changing a sound wave pointing angle of a sound wave path length correction
throat unit is provided. SOLUTION: A sound wave path length is corrected by inputting a sound
wave from an entrance opening 13a, and a sound wave path length correction throat portion 13b
for narrowing and emitting a sound wave directivity angle in a longitudinal direction from a
rectangular outlet opening 13b. And a rectangular inlet opening 16a for receiving the sound
waves emitted from the rectangular outlet opening 13b of the sonic path length correction throat
unit 13 which is attached to the tip side of the horn 12 having the adapter mounting horn
portion 14; , And a rectangular outlet opening 16b for emitting the sound wave input from the
rectangular inlet opening 16a to the outside, and the sound wave directivity angle 2α 'in the
longitudinal direction at the rectangular inlet opening 16a is a throat for sound path length
correction The sound wave directivity angle is characterized by changing it to an angle larger
than the sound wave directivity angle 2α in the longitudinal direction in the rectangular outlet
opening 13 b of the portion 13 An adapter horn 16 for changing the degree is provided.
[Selected figure] Figure 7
Adapter horn and horn speaker system for changing sound wave directivity angle
[0001]
In the present invention, a horn having a throat and a horn is connected to a sound source such
as a speaker, and after the sound wave output from the sound source is input from the entrance
opening of the throat, this sound wave is generated within the sound path of the throat. The
sound wave emitted from the rectangular outlet opening of the throat when the sound wave path
length is corrected and emitted from the rectangular outlet opening of the throat toward the
horn side so that the wave front of the sound wave becomes a rectangular plane. On the other
hand, the present invention relates to an acoustic wave directivity angle changing adapter horn
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1
for changing the sound wave directivity angle in the longitudinal direction at the outlet opening
in a direction to be expanded and a horn speaker system to which this sound wave directivity
angle changing adapter horn is applied.
[0002]
Generally, in order to efficiently amplify a sound wave output from a sound source such as a
speaker, a horn of a megaphone structure is connected to the sound wave output port of the
sound source because the resistance is too small when air is directly vibrated. There is.
[0003]
FIG. 13 is a view schematically showing a general horn speaker.
[0004]
In the general horn speaker shown in FIG. 13, a horn h of a megaphone structure is connected to
a sound source o such as a speaker, and a sound path r formed in the horn h is a sound wave
input from the entrance opening of the horn h. After passing, this sound wave is emitted from the
outlet opening to the outside.
[0005]
In this case, the horn h is a sound path of sound waves passing through the sound path r. Each
sound path length oa, ob, oc, od, oe, of and og is oa <ob <oc <od <oe <of < Since the sound path r
is formed so as to be og, the sound wave can obtain a concentric wave wavefront w in the same
phase with the sound source o being a point sound source, but in the case of a concentric wave
surface w, the sound source o The sound pressure is attenuated according to the distance from
the to the viewer.
[0006]
Therefore, in order to avoid attenuation of the sound pressure generated when the wave front of
the sound wave emitted to the outside from a general horn speaker is concentric, the sound wave
output port of the sound source such as a speaker has a throat portion and a horn portion The
horn is connected and the sound wave output from the sound wave output port of the sound
source is input from the entrance opening of the throat section, and then the sound wave path
length is corrected in the sound path of the throat section, and the exit opening of the throat
section When the sound is emitted from the throat to the side of the horn, a plurality of sound
paths in the throat are formed so that the wave front having the same phase as the sound wave
emitted from the throat to the side of the horn becomes flat in the discharge direction. There is a
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sound wave guide structure for a speaker system that is branched into a branch path of a stage
(see, for example, Patent Document 1).
[0007]
Re-issued 2004/086812.
[0008]
FIG. 14 is a longitudinal sectional view showing the sound path in the throat portion in the
conventional horn speaker.
[0009]
The conventional horn speaker 100 shown in FIG. 14 is disclosed in the above-mentioned Patent
Document 1 (Re-publication 2004/086812), and will be briefly described here with reference to
Patent Document 1.
[0010]
As shown in FIG. 14, the conventional horn speaker 100 includes a speaker (not shown) serving
as a sound source, a throat portion 110 connected to the speaker (not shown), and a horn
portion 120 connected to the throat portion 110. The throat portion 110 and the horn portion
120 are vertically symmetrical.
[0011]
Under the present circumstances, while the flange 111 for attaching a speaker not shown is
provided in the base end part of the throat part 110 of the horn speaker 100, while the entrance
opening 112 is formed here, the front-end part of the throat part 110 A rectangular and slit-like
outlet opening 113 is formed on the
[0012]
In addition, a sound path r is formed in the area from the proximal end to the distal end of the
throat portion 110 of the horn speaker 100, and the sound path r has a plurality of steps (for
example, three steps in the form of branches). Since it is composed of branched branch paths
(D1... First stage), (D2, D2 .. second stage), and (D3, D3, D3, D3... Third stage), it is formed at the
tip of throat portion 110 The rectangular and slit-shaped outlet opening 113 has eight outlets t1
to t8.
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[0013]
And in the case of the conventional horn speaker 100, with respect to the multistage branched
path (D1), (D2, D2), (D3, D3, D3, D3) formed in the sound path r of the throat part 110. When the
speaker (not shown) attached to the flange 111 is driven so that all acoustic path lengths from
the inlet opening 111 to each outlet t1 to t8 are equal, the rectangular and slit-like outlet is
driven. Sound waves are emitted from the opening 113 in the same phase, and the wave front wa
of the emitted sound waves is in the form of a rectangular plane which is flat with respect to the
emission direction.
[0014]
By the way, according to the conventional horn speaker 100 described above, the rectangular
and slit-like outlet opening 113 formed at the tip of the throat portion 110 by the branched path
in which the inside of the sound path r of the throat portion 110 is branched into multiple steps.
In addition to being able to control the wave front wa of the sound wave emitted from the
rectangular plane, the length of the outlet opening 113 for the sound wave emitted from the
rectangular slit-like outlet opening 113 formed at the tip of the throat portion 110 It is possible
to preset the sound wave directivity of the direction to a narrow sound wave directivity angle of,
for example, about 0 ° to 20 °.
[0015]
The sound wave directivity angle described above generally means that when the sound pressure
of the sound wave emitted from the horn speaker is 0 dB on the front axis, the sound pressure is
attenuated by -6 dB with respect to the front axis Say the angle of
[0016]
However, when at least one or more conventional horn speakers 100 are installed indoors, at a
gathering place where many people gather, at a gymnasium, etc., a rectangular shape formed at
the tip of throat 110 according to the position of the audience In some cases, the sound wave
directivity in the longitudinal direction at the slit-like outlet opening 113 may be changed to a
wider sound wave directivity angle, that is, it may be desired to ensure that the sound wave
emitted from the horn speaker 100 reaches the audience.
[0017]
In such a case, it is necessary to prepare another horn speaker having a wide sound wave
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pointing angle, and replace the horn speaker having a narrow sound wave pointing angle that
has already been installed with another horn speaker having a wide sound wave pointing angle.
This requires a great deal of effort, which adds to the cost of another horn speaker and the
replacement cost, resulting in an increase in cost.
Furthermore, when replacing a horn speaker having a narrow sound wave directivity angle with
another horn speaker having a wide sound wave directivity angle, if the horn speaker having a
narrow sound wave directivity angle is installed at a high position, the sound wave directivity
angle It is difficult to replace the entire narrow horn speaker.
[0018]
Therefore, a horn having a throat portion and a horn portion is connected to a sound source such
as a speaker, and after the sound wave output from the sound source is input from the entrance
opening of the throat portion, the sound wave travels within the sound path of the throat portion.
When the length is corrected and emitted from the rectangular outlet opening of the throat
portion to the horn portion side so that the wave front of the sound wave becomes a rectangular
plane, the sound wave emitted from the rectangular outlet opening of the throat portion It is
possible to change the longitudinal sound wave directivity angle at the outlet opening in the
direction to be expanded and to apply the sound wave directivity angle changing adapter horn
which can be easily attached to the tip of the horn and the sound wave directivity angle changing
adapter horn A horn speaker system is desired.
[0019]
The present invention has been made in view of the above problems, and the invention according
to claim 1 is characterized in that a sound wave is input from an inlet opening connected to a
sound source, and the sound wave is predetermined from the rectangular outlet opening in the
longitudinal direction. It is attached to the tip side of a horn having a throat portion for emitting
at a sound wave pointing angle and an adapter attaching horn portion connected to the throat
portion, and the predetermined sound wave directivity angle of the sound wave emitted from the
throat portion is larger than that An adapter horn for changing a sound wave pointing angle for
changing into a large angle, comprising: a rectangular inlet opening for inputting the sound wave
emitted from the rectangular outlet opening formed in the throat; And a rectangular outlet
opening for emitting the sound wave input from the inlet opening to the outside, and the
longitudinal dimension of the rectangular inlet opening is The rectangular outlet opening in
which the sound wave directivity angle in the longitudinal direction in the rectangular inlet
opening is formed in the throat portion by setting the dimension in the longitudinal direction of
the rectangular outlet opening formed in the gutter portion shorter The sound wave pointing
angle changing adapter horn is characterized in that the angle is changed to a larger angle than
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the sound wave pointing angle in the longitudinal direction in.
[0020]
The invention according to claim 2 is the adapter horn for sound wave directivity angle change
according to claim 1, wherein the dimension in the longitudinal direction of the rectangular inlet
opening formed in the sound wave directivity angle change adapter horn is: It is an adapter horn
for sound wave directivity angle change characterized by having variable means changed to
arbitrary dimensions shorter than a size of a longitudinal direction of said rectangular shaped
outlet opening formed in said throat part.
[0021]
The invention according to claim 3 is a sound source for outputting a sound wave, and the sound
wave is input from an inlet opening connected to the sound source, and the sound wave is
directed at a predetermined sound wave directivity angle in a longitudinal direction from a
rectangular outlet opening. A horn having a throat portion to be released in the step and an
adapter mounting horn portion connected to the throat portion; and the sound wave emitted
from the rectangular outlet opening formed on the throat portion attached to the tip portion of
the horn A rectangular inlet opening to be input, and a rectangular outlet opening for emitting
the sound wave input from the rectangular inlet opening to the outside, and the longitudinal
dimension of the rectangular inlet opening is The acoustic wave directivity angle in the
longitudinal direction at the rectangular inlet opening is set to be shorter than the longitudinal
dimension of the rectangular outlet opening formed in the throat portion. , And the adapter horn
wave directivity angle changes to change an angle larger than the longitudinal wave directivity
angle in the rectangular outlet opening formed in serial throat portion is a speaker system
characterized by comprising a.
[0022]
The invention according to claim 4 relates to the speaker system according to claim 3, wherein
the throat portion corrects the acoustic path length of the sound wave input from the entrance
opening in a sound path, and the sound wave is generated. It is a speaker system characterized
by narrowing the sound wave directivity angle in the longitudinal direction from the rectangular
outlet opening and emitting it so that the wave front of the sound wave becomes a rectangular
plane.
[0023]
Furthermore, according to the invention of claim 5, in the speaker system according to claim 3 or
4, the dimension in the longitudinal direction of the rectangular inlet opening formed in the
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sound wave directivity angle changing adapter horn is According to another aspect of the present
invention, there is provided a speaker system including variable means for changing to any
dimension shorter than the longitudinal dimension of the rectangular outlet opening formed in
the throat portion.
[0024]
According to the adapter horn for changing the sound wave pointing angle according to claim 1
and the speaker system according to claim 3, the sound wave is input from the inlet opening
connected to the sound source, and the sound wave is predetermined from the rectangular outlet
opening in the longitudinal direction. When the adapter horn for changing the sound wave
pointing angle is attached to the tip side of the horn having the throat portion for emitting at the
sound wave pointing angle and the adapter attaching horn portion connected to the throat
portion, the adapter horn for changing the sound wave pointing angle is formed. By setting the
longitudinal dimension of the rectangular inlet opening to be shorter than the longitudinal
dimension of the rectangular outlet opening formed in the throat portion, the rectangular inlet
opening formed in the sound wave directivity angle changing adapter horn The longitudinal
sound wave directing angle in the longitudinal direction is set to the longitudinal sound wave in
the rectangular outlet opening formed in the throat portion. The angle can be changed to a larger
angle than the heading angle, so when at least one or more horn speaker systems are installed
indoors or at a meeting place or gymnasium where many people gather, outside the adapter horn
for changing the sound wave directivity angle Sound waves emitted can be reliably delivered to
the audience.
Furthermore, even when a horn speaker having a narrow sound wave directivity angle is installed
at a high position, the sound wave directivity can be expanded simply by attaching the sound
wave directivity angle change adapter horn, and the sound wave directivity angle change adapter
horn It is easy to attach to the tip of the horn.
[0025]
Also, according to the sound wave directivity angle changing adapter horn of claim 2 and the
speaker system of claim 5, the longitudinal dimension of the rectangular inlet opening formed in
the sound wave directivity angle changing adapter horn is the throat portion. The provision of
the variable means which can be changed to any dimension shorter than the longitudinal
dimension of the formed rectangular outlet opening can provide a speaker system having good
usability.
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[0026]
Furthermore, according to the speaker system of claim 4, the throat portion corrects the acoustic
path length of the sound wave input from the inlet opening in the sound path, so that the sound
wave is directed from the rectangular outlet opening in the longitudinal direction. Since the
narrowing and the wave front of the sound wave are emitted so as to be in the form of a
rectangular plane, in addition to the effects described in claim 1 and claim 4 described above,
even in the case of a short wave wavelength (high frequency) The audience can hear sound
waves of uniform sound pressure without interference between the sound waves.
[0027]
Hereinafter, an embodiment of the horn horn speaker system to which the adapter horn for
changing the sound wave pointing angle according to the present invention and the adapter horn
for changing the sound pitching angle are applied will be described with reference to FIGS. It will
be described in detail in order of 2.
[0028]
FIG. 1 is a perspective view showing an adapter horn for changing a sound wave pointing angle
and a horn speaker system according to a first embodiment of the present invention.
[0029]
As shown in FIG. 1, in the speaker system 10 according to the first embodiment of the present
invention, a speaker 11 serving as a sound source for outputting a sound wave, and a horn 12
connected to a sound wave output port (not shown) of the speaker 11 And an adapter horn 16
for changing the directivity of the sound wave, which is detachably attached to the tip of the horn
12 by a plurality of screws 15.
[0030]
Here, the speaker 11 described above functions as a tweeter driver.
[0031]
Further, the horn 12 described above is connected to the sound wave output port (not shown) of
the speaker 11 and inputs the sound wave output from the speaker 11 from the inlet opening
13a to correct the sound wave path length to thereby form a rectangular outlet opening. When
emitting a sound wave from 13b, the wave front of the same phase of the sound wave is emitted
so as to be a flat rectangular plane which is flat with respect to the emission direction, and the
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sound wave directivity in the longitudinal direction of the rectangular outlet opening 13b is A
sonic path length correction throat portion 13 set to a narrow sound wave directivity angle (for
example, 20 °), and a large megaphone structure adapter attachment horn portion 14 formed
by connecting to the sonic path length correction throat portion 13 have.
[0032]
At this time, the adapter mounting horn portion 14 in the horn 12 has a function of storing the
small megaphone structure formed in the sound wave directivity angle changing adapter horn 16
in a large megaphone structure, and the sound wave directivity angle When the change adapter
horn 16 is not attached, it has a function of spreading the sound wave emitted from the
rectangular outlet opening 13b of the sound path length correction throat part 13 to the outside.
[0033]
In addition, the above-mentioned sound wave directivity angle changing adapter horn 16 makes
a wide sound wave directivity angle (sound wave emitted at a narrow sound wave directivity
angle (for example, 20 °) from the rectangular outlet opening 13b of the sound wave path
length correction throat 13 For example, it has a function of changing it to 40 ° and emitting it
to the outside, and this sound wave directivity angle changing adapter horn 16 is the main part
of the first embodiment.
[0034]
Here, regarding the respective constituent members of the speaker system 10 according to the
first embodiment having the above-mentioned configuration, the acoustic path length correction
throat 13 in the horn 12, the adapter mounting horn 14 in the horn 12, the adapter horn for
sound wave directivity angle change It will be described in the order of 16.
[0035]
First, FIG. 2 is a perspective view showing a state in which a throat portion for sound wave path
length compensation in the horn is connected to the speaker in the horn speaker system of the
first embodiment according to the present invention, FIG. 3 (a), (b) FIG. 4 is a perspective view of
a throat portion for sound wave path length correction in the horn in the horn speaker system
according to the first embodiment as viewed from the right side and the left side, respectively;
FIGS. In the horn speaker system of Example 1, a rear view, a longitudinal sectional view, a front
view, an AA sectional view, a top view, and a use range diagram of a hyperbola showing a sound
ray path length compensating throat part in the horn.
03-05-2019
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[0036]
As shown in FIGS. 2 to 4, the sonic path length correction throat portion 13 in the horn 12 is
formed of a resin material and divided into two left and right throat portions 13L and 13R. The
division surfaces of the left and right throats 13L and 13R are joined together in a lid.
[0037]
Further, in the sound wave path length correction throat portion 13 described above, the
entrance opening 13a is smaller at the rear end side in accordance with the sound wave output
port (not shown) of the speaker 11, but the space is separated from the entrance opening 13a.
An outlet opening 13b is formed in a large rectangular shape in accordance with the inlet
opening 14a of the adapter mounting horn portion 14 shown in FIG.
[0038]
Under the present circumstances, as the size of the rectangular-shaped outlet opening 13b
formed in the front end side of the sonic path length correction throat part 13 has a size 2p (= p
+ p) of the longitudinal direction as shown in FIG. The length is set to be vertically symmetrical
across CO, while the dimension q in the short direction is set to be short.
[0039]
Further, the sound wave directivity angle 2α {Fig. 7 (c)} in the longitudinal direction at the outlet
opening 13b formed in a rectangular shape on the tip end side of the sound ray path length
correction throat portion 13 is set in advance narrow as described later In the first embodiment,
the above-mentioned sound wave directivity angle 2α is set to, for example, 20 °.
[0040]
Further, in the sound wave path length correction throat portion 13, left and right side surfaces
13 c and 13 d corresponding to the longitudinal direction of the rectangular outlet opening 13 b
and facing each other at intervals are formed in a concave surface and a convex surface,
respectively. In addition, upper and lower side surfaces 13e and 13f corresponding to the
widthwise direction of the rectangular outlet opening 13b and facing each other at a distance
from each other are formed to gradually expand from the inlet opening 13a toward the outlet
opening 13b, And the sound path 13g is formed in the inside surrounded by the 1st-4th side
13c-13f.
[0041]
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10
Then, after the sound wave output from the sound wave output port (not shown) of the speaker
11 is input from the entrance opening 13a of the sound wave path length correction throat
portion 13, the sound wave path length in the sound path 13g as described later. To the adapter
mounting horn portion 14 (FIG. 1) side and the sound wave directivity angle changing adapter
horn 16 side (FIG. 1) at a narrow sound wave directivity angle 2α (eg, 20 °) from the
rectangular outlet opening 13b. It is done.
[0042]
At this time, in the sound path 13g of the acoustic path length correction throat portion 13, the
multistage branched path structure in the conventional example as described with reference to
FIG. 14 is not formed, and as described later The wave front of the sound wave emitted from the
rectangular outlet opening 13b is emitted when the sound wave output from the laser is emitted
from the rectangular outlet opening 13b formed at the tip of the acoustic path length correction
throat portion 13 A sound path 13 g for correcting the acoustic path length is formed in the
acoustic path length correction throat portion 13 so as to be in a rectangular planar shape flat
with respect to the direction.
[0043]
That is, the left side 13c side of the sonic path length correction throat portion 13 is formed in a
concave concave surface which is directed inward along the longitudinal direction of the
rectangular outlet opening 13b, while the sonic path length correction throat portion Since the
right side surface 13d side of 13 is formed in a convex curved surface directed outward along the
longitudinal direction of the rectangular outlet opening 13b, a sound wave is generated with
respect to the sound wave output from the speaker 11 in the sound path 13g. The path length is
properly corrected.
[0044]
Under the present circumstances, it is a sound wave, when the state cut | disconnected in AA
direction along central-axis CO in the sound path 13g of the throat part 13 for sound wave path
length corrections shown in FIG.4 (b) is shown in FIG. The central axis CO connecting the center
of the entrance opening 13a opened on the rear end side in the sound path 13g of the throat
portion 13 for path length correction and the center of the exit opening 13b opened in a
rectangular shape on the tip end The acoustic wave path length reference axis for designing the
acoustic wave path length for the sound wave passing through is set on the outlet aperture 13b
side from the acoustic path length correction start position set on the inlet aperture 13a side
passing over the central axis CO The design reference sound wave path length is calculated in
advance as follows for one sound wave path length correction path up to the sound wave path
length correction end position.
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[0045]
Specifically, in the sound path 13g of the sound path length correction throat portion 13, one
sound path length correction path passing on the central axis CO is the sound path length
correction start position set on the entrance opening 13a side. The acoustic path length
correction end position set on the outlet opening 13b side is smoothly connected in a curved line
by the first arc, the predetermined function curve, and the second arc, and the acoustic path
length correction start The length of the curve between the position and the acoustic path length
correction end position is calculated as the design reference acoustic path length of the acoustic
path length correction path.
[0046]
And although the hyperbola is applied as a predetermined function curve in the example
sectioned in FIG. 4D, the predetermined function curve is not limited to the hyperbola, and the
predetermined function curve is a sine curve, a cosine curve, An arc curve, a square curve curve,
an elliptic curve, a crosoid curve, a cycloid curve, a quadratic curve or higher, a regular
logarithmic curve, a natural logarithmic curve, a suspension curve, etc. may be applied.
[0047]
Here, in the sound path 13g of the sound path length correction throat unit 13, the design
reference sound path length AL of one sound path length correction path passing on the central
axis CO can be calculated from the following equation 1 .
[0048]
[0049]
At this time, in the equation (1), RL indicates the lengths of the first and second arcs which
smoothly connect the both ends between the inlet opening 13a side and the outlet opening 13b
side symmetrically left and right, and SL indicates a predetermined length The length of a
hyperbola at the time of applying a hyperbola as an example of a functional curve is shown.
[0050]
Then, when a hyperbolic curve is applied as an example of a predetermined functional curve, the
hyperbolic curve can be expressed as the following equation 2 when the xy coordinate axes are
set as shown in FIG.
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[0051]
[0052]
At this time, in FIG. 4F, the focal point of the hyperbola is set to the left and right of the origin on
the x axis, and the axis orthogonal to the x axis and passing through the origin is taken as the y
axis.
[0053]
Further, the following equation 3 is established from the above equation 2.
[0054]
[0055]
Furthermore, the length SL of the hyperbola mentioned above is determined by the following
equation 4.
[0056]
[0057]
At this time, as shown in FIG. 4 (f), the maximum value A of y indicates a value from the origin
toward the plus side on the y axis, while the minimum value B of y has a value toward the minus
side from the origin. The hyperbola length SL described above can be obtained by substituting
the maximum value A of y and the minimum value B of y into the above-described equation (4).
[0058]
If the length SL of the hyperbola can not be solved by the above equation 4, an approximate
value IL corresponding to the length SL of the hyperbola may be obtained by the following
equation 5 as an approximate expression.
[0059]
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13
[0060]
At this time, the approximation value IL corresponding to the length SL of the hyperbola is
divided into a plurality (n) of intervals between the highest value A of y and the lowest value B of
y shown in FIG. It is sufficient to divide and calculate the width h per piece, and substitute the
width h per piece into the equation 5 described above.
[0061]
Then, if the length RL of each of the left and right first and second arcs and the length SL of the
hyperbola are added by the above-mentioned equation 1, one acoustic path length correction
path passing through the central axis CO is obtained. The design reference sound wave path
length AL can be calculated, and as described later, the design reference sound wave path lengths
AL with respect to a plurality of sound wave path length correction paths set in the sound path
13g of the sound path length correction throat unit 13 Each acoustic wave path length is
calculated based on (Equation 1) so as to satisfy the condition shown in FIG. 5 described later.
[0062]
That is, without providing a plurality of partition walls in the sound path 13g of the sound path
length correction throat portion 13, a plurality of sound path length correction paths are formed
along the longitudinal direction of the rectangular outlet opening 13b in the sound path 13g. A
specific example of setting and correcting each acoustic path length based on the design
reference acoustic path length AL (Equation 1) with respect to the plurality of acoustic path
length correction paths will be described with reference to FIG.
[0063]
Fig. 5 shows a plurality of sound wave path lengths set in the sound path of the sound path
length correction throat portion so that the wave front of the sound wave emitted from the sound
path length correction throat to the adapter mounting horn portion becomes rectangular flat. It is
the figure which showed typically the case where each sound wave path length of a correction |
amendment path | pass is correct | amended.
[0064]
In FIG. 5 below, oa, ob, oc, od, oe, of, og indicate a plurality of sound wave paths until the wave
front wo of the sound wave from the sound source o is output concentrically, while oa ', ob', oc ',
od', oe ', of' and og 'are the acoustic path lengths of the acoustic wave path length correction
throat portion 13 with respect to the acoustic wave emitted from the sound source o Fig. 6 shows
a plurality of sound wave path length correction paths when correcting.
03-05-2019
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[0065]
At this time, one acoustic path length correction path passing on the central axis CO in the sound
path 13g of the acoustic path length correction throat portion 13 is smoothly connected by the
first arc, the predetermined function curve, and the second arc. When forming at, since the
above-mentioned predetermined functional curve uses any of various functional curves as
described above, one acoustic path length correction path can be easily designed without
performing special calculation processing. At the same time, since the length SL of the function
curve in one acoustic path length correction path can be easily calculated, it is set in the sound
path 13g of the acoustic path length correction throat unit 13 based on the one acoustic path
length correction path. A plurality of acoustic path length correction paths can be easily formed.
[0066]
Furthermore, in FIG. 5, the sound paths 13g of the acoustic path length correction throat portion
13 are formed vertically symmetrical with respect to the central axis CO, so a plurality of
acoustic path length correction paths oa ', ob', oc '. The display of od ', oe', of 'and og' is
illustrated only at the upper side.
[0067]
In addition, the plurality of acoustic path length correction paths oa ', ob', oc ', od', oe ', of', og 'set
in the sound path 13g of the acoustic path length correction throat unit 13 Design reference
acoustic path length AL obtained by connecting a first arc, a predetermined function curve and a
second arc to one acoustic path length correction path which passes the path length on the
central axis CO Based on the conditions shown in FIG. 5 which will be described later, but in FIG.
5 the respective acoustic wave path length correction paths oa ′, ob ′, oc ′, for convenience
of illustration. od ', oe', of ', og' are illustrated in a straight line.
[0068]
Specifically, as shown in FIG. 5, the acoustic path length correction throat portion 13, which is an
essential part of the present invention, does not provide multiple stages of partition walls in the
sound path 13g formed inside the sound path. A plurality of acoustic path length correction
paths oa ′, ob ′, oc ′, od ′, oe ′, of ′, og ′ are set along the longitudinal direction of the
rectangular outlet opening 13 b within 13 g, and a plurality of acoustic path length correction
paths are set. Design basis acoustic path length AL (equation 1) of one acoustic path length
correction path passing on center axis CO with respect to acoustic path oa ', ob', oc ', od', oe ', of',
og ' When correcting each acoustic path length based on the basis, the output ends of the
plurality of acoustic paths oa, ob, oc, od, oe, of, og concentrically emitted from the sound source
03-05-2019
15
o are used as the acoustic path length correction start position And the exit opening 13b of the
sound path length correction throat portion 13 A plurality of sound-wave path length correction
path oa ', ob', oc ', od', oe ', of', is set as the acoustic path length correction end position of og '.
[0069]
Then, in the case shown in FIG. 5, a plurality of acoustic path length correction paths oa ′, ob ′,
along the longitudinal direction of the rectangular outlet opening 13b in the sound path 13g of
the acoustic path length correction throat portion 13. One acoustic path length correction
passing through a central axis CO connecting oc ', od', oe ', of', og 'and connecting the center of
the inlet opening 13a and the longitudinal center of the rectangular outlet opening 13b A first
arc, a predetermined function curve, and a second curve between the sound wave path length
correction start position set on the inlet opening 13a side and the sound wave path length
correction end position set on the outlet opening 13b side with respect to the path oa ′ The
length of the curve between the acoustic path length correction start position and the acoustic
path length correction end position in one acoustic path length correction path oa ′ is set as the
reference acoustic path length AL (number Calculated as 1), and multiple acoustic path length
Each acoustic path length of paths oa ', ob', oc ', od', oe ', of', og 'is set equal to design reference
acoustic path length AL, in other words, each acoustic path length is oa' = ob Since the sound
path 13g is formed so that '= oc' = od '= oe' = of '= og', for attaching the adapter from the exit
opening 13b of the sound path 13g of the throat portion 13 for sound path length correction.
The wave front wa, which is the same phase of the sound wave emitted to the horn unit 14 (FIG.
1, FIG. 2) side and the sound wave directivity angle changing adapter horn 16 (FIG. 1) side,
Become.
[0070]
Therefore, according to the sound wave path length correction throat portion 13 shown in FIG. 5,
the side of the adapter mounting horn portion 14 (FIGS. 1 and 2) and the sound wave directivity
angle from the outlet opening 13b of the sound path 13g formed inside The wave front wa of the
sound wave emitted to the changing adapter horn 16 (FIG. 1) is in the form of a rectangular flat
surface which is flat with respect to the emission direction, so even in the case where the
wavelength of the sound wave is short (high frequency) Since no interference occurs, a sound
wave with uniform sound pressure can be provided, and a horn speaker system 10 with good
performance can be provided.
[0071]
Furthermore, according to the sonic path length correction throat unit 13 shown in FIG. 5, the
multistage branched path structure in the conventional example as described with reference to
FIG. 14 is not formed in the sound path 13g. The sound path 13g of the path length correction
03-05-2019
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throat portion 13 can be easily manufactured, and even if the sound path length correction
throat portion 13 is large, the sound path 13g does not have a complicated structure, and Even if
the acoustic path length correction throat portion 13 is configured to be compact, the formation
of the sound path 13g does not become difficult in space.
[0072]
Returning to FIG. 1, the adapter mounting horn portion 14 in the horn 12 is integrally formed
with a large megaphone structure in a symmetrical manner vertically and horizontally using a
resin material, and has a rectangular inlet opening 14a at the rear end side. The acoustic path
length correction throat portion 13 is connected to the rectangular outlet opening 13b of the
same size and opened at the same size, while the rectangular outlet opening 14b is spaced apart
from the rectangular inlet opening 14a at the distal end side. Are larger in the left-right direction
than the rectangular inlet opening 14a.
[0073]
Under the present circumstances, although the size of the outlet opening 14b formed in
rectangular shape in the front end side of the adapter attachment horn part 14 is formed slightly
large with respect to the dimension of the longitudinal direction of the rectangular-shaped inlet
opening 14a, rectangular shape The lateral direction is enlarged by several times with respect to
the dimension in the lateral direction of the entrance opening 14a.
[0074]
Further, the above-mentioned adapter mounting horn portion 14 includes a plurality of sound
wave directivity angle changing adapter horns 16 as a main part of the first embodiment along
the left and right outer peripheries of the rectangular outlet opening 14b formed on the tip end
side. The flanges 14c for attachment using the screws 15 are formed, and a plurality of screw
holes 14c1 are formed in the flanges 14c on both sides.
[0075]
Furthermore, in the adapter mounting horn portion 14 described above, the space between the
rectangular inlet opening 14a and the rectangular outlet opening 14b is surrounded by the left
and right side surfaces 14d and 14e and the upper and lower side surfaces 14f and 14g. And
although the dimension in the longitudinal direction hardly changes from the rectangular inlet
opening 14a toward the rectangular outlet opening 14b, the lateral dimension is formed so as to
gradually spread to the left and right.
03-05-2019
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[0076]
Next, the sound wave pointing angle changing adapter horn 16 which is the main part of the first
embodiment will be described with reference to FIG. 1 used earlier and new FIG. 6 and FIG.
[0077]
6 (a) to 6 (d) are a front view, a bottom view, a right side, and a rear view showing an adapter
horn for changing the sound wave pointing angle, which is an essential part of the first
embodiment, and FIGS. 7 (a) to 7 (c) are It is the front view, bottom view, and right side which
showed the state which attached the adapter horn for sound wave directivity angle change which
becomes the principal part of Example 1 to the horn part for adapter attachment in a horn.
[0078]
As shown in FIGS. 1 and 6 (a) to 6 (d), the sound wave directivity angle changing adapter horn
16, which is a main part of the first embodiment, is integrally formed of a small megaphone
structure symmetrically in the vertical and horizontal directions using a resin material. The smallsized megaphone structure is configured to be storable in a large-sized megaphone structure
formed in the adapter mounting horn portion 14.
[0079]
Further, in the above-mentioned sound wave directivity angle changing adapter horn 16, a
rectangular inlet opening 16a is formed on the rear end side in order to input the sound wave
emitted from the rectangular outlet opening 13b of the sound path length correction throat
portion 13. Are opened so as to be in contact with the rectangular outlet opening 13b of the
throat portion 13 for correcting the acoustic path length with the central axis CO facing the
same, and the rectangular entrance opening 16a is an acoustic path as described later. The
dimension in the longitudinal direction 2p '(2p' <2p) shorter than the dimension 2p {Fig. 4 (c)} in
the longitudinal direction of the rectangular outlet opening 13b of the length correction throat
13 is preset and rectangular The dimension q in the lateral direction of the inlet opening 16a of
the second embodiment is set to the same size as the dimension q {FIG. 4 (c)} in the lateral
direction of the rectangular outlet aperture 13b of the sonic path length correction throat portion
13.
[0080]
Further, the above-mentioned sound wave directivity angle changing adapter horn 16 has a
rectangular shape on the tip side facing the rectangular inlet opening 16a at a distance from the
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rectangular inlet opening 16a in order to release the sound wave input from the rectangular inlet
opening 16a. The outlet opening 16b formed in the opening is larger than the rectangular inlet
opening 16a, and the flange 16c is formed to be flat horizontally and symmetrically along the
outer periphery of the rectangular outlet opening 16b. A plurality of screws 15 are detachably
attached to a flange 14 c formed on the tip end side of the adapter mounting horn portion 16 c.
At this time, a plurality of attachment holes 16c1 for attaching a plurality of screws 15 are
formed on the left and right of the flange 14c.
[0081]
Furthermore, the above-mentioned sound wave directivity angle changing adapter horn 16 is
surrounded by the left and right side surfaces 16d and 16e and the upper and lower side
surfaces 16f and 16g between the rectangular inlet opening 16a and the rectangular outlet
opening 16b. The sound path is formed so as to gradually spread in the longitudinal direction
and the latitudinal direction from the rectangular inlet opening 16 a to the rectangular outlet
opening 16 b.
[0082]
At this time, when the sound wave emitted from the rectangular outlet opening 13 b of the sound
path length correction throat 13 is input into the adapter attachment horn 14, the small size
formed in the sound wave directivity angle changing adapter horn 16 The sound wave in the
adapter mounting horn portion 14 emitted to the outside of the megaphone structure is shielded
by the flange 16 c so as not to be emitted to the outside.
[0083]
Here, as shown in FIGS. 7A to 7C, the sound wave directivity angle changing adapter horn 16 is
attached to the tip end side of the adapter attachment horn portion 14 in the horn 12, and the
sound wave directivity angle change is made. With the rectangular inlet opening 16a of the
adapter horn 16 in contact with the rectangular outlet opening 13b of the sonic path length
correction throat portion 13 vertically symmetrically with respect to the central axis CO, the
sonic path length correction When the wave front wa (FIG. 5) of the sound wave emitted from the
rectangular outlet opening 13b of the throat unit 13 is rectangular flat, the longitudinal length of
the rectangular outlet opening 13b formed in the acoustic path length correction throat unit 13
(2) (= α + α) of the sound wave directivity angle in the direction can be obtained from the
following equation 6, and a rectangular inlet opening formed in the adapter horn 16 for
changing the sound wave directivity angle Longitudinal wave directivity angle 2α in 6a to '(= α'
+ α ') can be obtained from Equation 7 below.
03-05-2019
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[0084]
[0085]
[0086]
At this time, as is apparent from FIG. 7C, α ′> α.
Further, the sound wave directivity function D = 0.5 in the above-mentioned equation 6 and the
sound wave directivity function D ′ = 0.5 in the equation 7 are obtained when the sound
pressure of the sound wave is 0 dB on the front axis. The values represent values obtained by
halving the energy corresponding to the sound wave directivity angle 2α or the sound wave
directivity angle 2α ′ when the sound pressure is attenuated by −6 dB with respect to the
front axis.
[0087]
In FIGS. 7A to 7C, the acoustic path length correction throat portion 13 has a rectangular
dimension of the outlet opening 13b in the longitudinal direction of 2p and a lateral dimension of
q. The sound wave directivity angle in the longitudinal direction is 2α.
On the other hand, the sound wave pointing angle changing adapter horn 16 has a rectangular
dimension of the entrance aperture 16a in the longitudinal direction of 2p ′ and a transverse
dimension of q, and the sound wave directing angle in the longitudinal direction is 2α ′. It is.
[0088]
Here, in general, a rectangular-shaped outlet in which the sound wave directivity angle 2α ′ in
the longitudinal direction in the rectangular inlet opening 16 a formed in the sound wave
directivity angle changing adapter horn 16 is formed in the sound wave path length correction
throat portion 13 When changing to an angle larger than the longitudinal sound wave directivity
angle 2α at the opening 13b, the longitudinal dimension 2p 'of the rectangular inlet opening
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16a formed in the sound wave directivity angle changing adapter horn 16 is the acoustic path
length It may be set shorter than the dimension 2p in the longitudinal direction of the
rectangular outlet opening 13b formed in the correction throat portion 13 (2p '<2p).
[0089]
That is, when the sound wave directivity angle 2α in the longitudinal direction in the rectangular
outlet opening 13b formed in the sound wave path length correction throat portion 13 is set to
20 °, for example, the sound wave directivity angle α = 10 ° The half value p of the dimension
in the longitudinal direction of the rectangular outlet opening 13b can be determined.
[0090]
Similarly, when the sound wave directivity angle 2α ′ in the longitudinal direction in the
rectangular inlet opening 16 a formed in the sound wave directivity angle changing adapter horn
16 is set to 40 °, for example, the sound wave directivity angle α ′ = 20 ° Since the half
value p 'of the dimension in the longitudinal direction of the rectangular inlet opening 16a can be
determined by substituting the equation 7 into the equation 7, the longitudinal dimension of the
rectangular inlet opening 16a is calculated from the half value p' obtained here It is good to
make the adapter horn 16 for sound wave directivity angle change based on the fixed value 2p
′ and based on this.
[0091]
As described above, by attaching the sound wave directivity angle changing adapter horn 16 to
the tip end side of the adapter attachment horn portion 14 in the horn 12, sound wave in the
longitudinal direction from the rectangular outlet opening 13b of the sound ray path length
correction throat portion 13 The sound wave emitted in the state where the directivity angle 2α
(= 20 °) is narrow is widely changed by the rectangular inlet opening 16a of the sound wave
directivity angle changing adapter horn 16 in the longitudinal direction 2α '(= 40 °). When the
horn speaker system 10 of the first embodiment is installed at least one or more in a room, at a
meeting place where many people gather, or in a gymnasium, etc. The emitted sound waves can
be reliably delivered to the audience, and the audience can communicate with each other even if
the wavelength of the sound waves is short (high frequency). Wave interference is not uniform
sound pressure can be heard.
[0092]
Next, a modified example in which the horn speaker system 10 of the first embodiment is
partially modified will be briefly described with reference to FIG.
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21
[0093]
8 (a) to 8 (c) show a state in which the sound wave directivity angle changing adapter horn of the
modified example in which the sound wave directivity angle changing adapter horn of Example 1
is partially deformed is attached to the adapter attachment horn portion in the horn. It is a front
view, a bottom view, a right side which showed.
[0094]
As shown in FIGS. 8 (a) to 8 (c), in the sound wave directivity angle changing adapter horn 16
'and the horn speaker system 10' of the modification in which the first embodiment is partially
modified, the sound wave directivity angle change adapter horn The sound wave directing angle
2α 'in the longitudinal direction at the rectangular inlet opening 16a of 16' is automatically
made larger than the sound wave directing angle 2α in the longitudinal direction at the
rectangular outlet opening 13b of the sound path length correction throat portion 13. It is
configured to be variable.
[0095]
That is, a drive source 17 such as a motor is connected to the upper side surface 16f side and the
lower side surface 16g side of the sound wave directivity angle changing adapter horn 16 ', and
the upper side surface 16f side and the lower side surface 16g side By moving in the arrow
direction along the longitudinal direction of the rectangular outlet opening 13b formed in the
acoustic path length correction throat portion 13, the rectangular inlet opening 16a formed in
the sound wave directivity angle changing adapter horn 16 ' The dimension 2p 'in the
longitudinal direction can be automatically varied so as to be shorter than the dimension 2p in
the longitudinal direction of the rectangular outlet opening 13b formed in the acoustic path
length correction throat portion 13.
[0096]
At this time, the sound wave directivity angle setting means 18 connected to the drive source 17
is a sound wave directivity angle in the longitudinal direction at the rectangular inlet opening 16
a of the sound wave directivity angle changing adapter horn 16 ′ based on the equation 7
described above. Since the relationship between 2α ′ and the longitudinal dimension 2p ′ of
the rectangular inlet opening 16a is stored in the table in advance, the rectangular outlet of the
acoustic path length correction throat portion 13 from the sound wave directivity angle setting
means 18 If a desired angle larger than the longitudinal sound wave directivity angle 2α (= 20
°) at the opening 13b is designated and input, the adapter horn 16 for changing the sound wave
directivity angle via the drive source 17 based on this desired angle. The longitudinal dimension
2p 'of the' rectangular inlet opening 16a can be remote-controlled to the throat portion 13 for
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correcting the optical path length according to the use environment such as indoors and a
gymnasium Is automatically variable can longitudinally any size less than the size 2p of the
rectangular outlet opening 13b which forms can usability provide good speaker system 10 '.
[0097]
FIG. 9 is a perspective view showing a horn speaker system according to a second embodiment of
the present invention, and FIGS. 10A and 10B show a throat part for sound wave path length
correction in the horn in the horn speaker system according to the second embodiment. 11A to
11C show a state in which the sound wave directivity angle changing adapter horn, which is an
essential part of the second embodiment, is attached to the adapter attachment horn portion in
the horn. It is a front view, a bottom view, a right side which showed.
[0098]
The horn speaker system 20 of the second embodiment according to the present invention
shown in FIG. 9 has the same configuration as that of the horn speaker system 10 of the first
embodiment described above except for a part of the configuration. The same reference
numerals are given to the constituent members shown above, and different constituent members
are given new reference numerals, and a brief description will be made focusing on differences
with respect to the first embodiment.
[0099]
As shown in FIG. 9, in the horn speaker system 20 according to the second embodiment of the
present invention, the acoustic path length correction throat portion 22 connected to the speaker
11 and the acoustic path length correction throat portion 22 are formed continuously. Only the
horn 21 having the adapter mounting horn portion 23 having a large megaphone structure is
different from that of the first embodiment, and the acoustic path length correction throat
portion 22 in the horn 21 is first of all shown in FIG. Similar to the conventional horn speaker
100 described above, a plurality of branched paths are formed inside.
[0100]
In the horn speaker system 20 described above, the sound wave directivity angle changing
adapter horn 16 formed in the same manner as in the first embodiment is detachably attached to
the tip of the adapter mounting horn 23 in the horn 21.
[0101]
At this time, the throat portion 22 for sound wave path length correction in the horn 21 has an
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entrance opening 22a smaller at the rear end side according to the sound wave output port (not
shown) of the speaker 11, while the entrance opening 22a and The outlet openings 22b are
widely opened in a rectangular shape in accordance with the inlet opening 23a of the adapter
mounting horn 23 on the tip side facing away from each other at intervals, and eight outlets t1 to
t8 are formed in the rectangular outlet opening 22b. have.
[0102]
That is, as shown in FIGS. 10A and 10B, the acoustic path length correction throat portion 22 in
the horn 21 described above has an inlet opening 22a formed on the rear end side and a
rectangular shape formed on the front end side. The branched path (D1... First stage), (D2, D2...
Second stage), in which the inside of the sound path 22r formed between it and the outlet
opening 22b is branched into a plurality of stages (for example, three stages like branches). Since
it is constituted by D3, D3, D3, D3... The third stage), the rectangular and slit-like outlet opening
22b has eight outlets t1 to t8.
[0103]
Under the present circumstances, the size of the rectangular and slit-shaped outlet opening 22
formed on the tip side of the acoustic path length correction throat portion 22 is vertically
symmetrical with the dimension 2p (= p + p) in the longitudinal direction across the central axis
CO. It is set to be long, while the dimension q in the short direction is set to be short.
[0104]
Then, with respect to a plurality of branched paths (D1), (D2, D2), and (D3, D3, D3, D3) formed in
the sound path r of the acoustic path length correction throat portion 22, from the entrance
opening 22a Since all sound wave path lengths from the respective outlets t1 to t8 are set to be
equal, when the speaker 11 (FIG. 9) is driven, the sound waves in the same phase are output from
the rectangular slit-like outlet opening 22b. The wave front wa of the emitted and emitted sound
wave is in the form of a rectangular plane which is flat with respect to the direction of emission.
[0105]
Here, as shown in FIGS. 11A to 11C, the sound wave directivity angle changing adapter horn 16
is attached to the tip end side of the adapter attachment horn portion 23 in the horn 21 and for
the sound wave directivity angle change. With the rectangular inlet opening 16a of the adapter
horn 16 in contact with the rectangular outlet opening 22b of the acoustic path length correction
throat portion 22 vertically symmetrically with respect to the central axis CO, the acoustic path
length correction When the wave front wa (FIG. 10) of the sound wave emitted from the
rectangular outlet opening 22b of the throat part 22 is rectangular flat, the rectangular and slit-
03-05-2019
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shaped outlet formed in the acoustic path length correction throat part 22 The sound wave
directivity angle 2α in the longitudinal direction at the opening 22b is set narrow as, for
example, 20 ° as in the first embodiment.
[0106]
On the other hand, the dimension 2p ′ (= p ′ + p ′) in the longitudinal direction of the
rectangular inlet opening 16a formed in the sound wave directivity angle changing adapter horn
16 is a rectangular shape formed in the sound ray path length correcting throat portion 22 Since
the slit-like outlet opening 22 is formed shorter than the longitudinal dimension 2p (= p + p), the
acoustic wave directivity angle 2α in the longitudinal direction at the rectangular inlet aperture
16a formed in the sound wave directivity angle changing adapter horn 16 'Is changed to an
angle larger than the sound wave directivity angle 2.alpha. In the longitudinal direction at the
rectangular slit-like outlet opening 22b formed on the sound wave path length correction throat
portion 22, and an adapter for sound wave directivity angle change The sound wave directivity
angle 2α ′ in the longitudinal direction of the rectangular inlet opening 16 a formed in the
horn 16 is set to, for example, 40 °.
[0107]
At this time, the sound wave directivity angle 2α in the longitudinal direction at the rectangular
slit-like outlet opening 22b formed in the sound wave path length correction throat portion 22
can be determined by the equation 6 described above, and the sound wave directivity angle The
sound wave directivity angle 2α ′ in the longitudinal direction at the rectangular inlet opening
16 a formed in the changing adapter horn 16 can be obtained by the equation 7 described above.
[0108]
As described above, in the same manner as in Example 1, when at least one or more horn speaker
system 20 of Example 2 is installed indoors or at a meeting place or gymnasium where many
people gather, as in Example 1, The sound waves emitted to the outside from the angle change
adapter horn 16 reliably reach the audience, and even if the wavelength of the sound waves is a
short frequency (high frequency), the audience can hear the sound waves with uniform sound
pressure without interference between the sound waves. You can hear
[0109]
Next, a modification in which the horn speaker system 20 of the second embodiment is partially
modified will be briefly described with reference to FIG.
03-05-2019
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[0110]
12 (a) to 12 (c) show a state in which the sound wave directivity angle changing adapter horn of
the modified example in which the sound wave directivity angle changing adapter horn of
Example 2 is partially deformed is attached to the adapter attaching horn portion in the horn. It
is a front view, a bottom view, a right side which showed.
[0111]
As shown in FIGS. 12 (a) to 12 (c), in the sound wave directivity angle changing adapter horn 16
'and the horn speaker system 20' of the modification in which the second embodiment is
partially modified, the sound wave directivity angle change adapter horn The sound wave
directing angle 2α 'in the longitudinal direction at the rectangular inlet opening 16a of 16' is
automatically made larger than the sound wave directing angle 2α at the rectangular outlet
opening 22b of the sound path length correction throat 22 It is configured to be variable.
[0112]
That is, a drive source 17 such as a motor is connected to the upper side surface 16f side and the
lower side surface 16g side of the sound wave directivity angle changing adapter horn 16 ', and
the upper side surface 16f side and the lower side surface 16g side By moving in the direction of
the arrow along the longitudinal direction of the slit-like outlet opening 22b formed in the throat
portion 22 for correcting the acoustic path length, the rectangular shape formed in the adapter
horn 16 'for changing the sound wave directivity angle The longitudinal dimension 2p 'of the
inlet opening 16a can be automatically varied so as to be shorter than the longitudinal dimension
2p of the rectangular slit-like outlet opening 22b formed in the acoustic path length correction
throat portion 22. It is supposed to be.
[0113]
At this time, the sound wave directivity angle setting means 18 connected to the drive source 17
is a sound wave directivity angle in the longitudinal direction at the rectangular inlet opening 16
a of the sound wave directivity angle changing adapter horn 16 ′ based on the equation 7
described above. Since the relationship between 2α ′ and the dimension 2p ′ in the
longitudinal direction of the rectangular inlet opening 16a is stored in the table in advance, the
rectangular shape formed in the acoustic path length correction throat portion 22 from the
acoustic wave direction angle setting means 18 If a desired angle larger than the longitudinal
sound wave directivity angle 2α (= 20 °) at the slit-like outlet opening 22b is designated and
input, the sound wave is directed via the drive source 17 based on the desired angle The
longitudinal dimension 2p 'of the rectangular inlet opening 16a of the angle change adapter horn
16' is controlled by remote control according to the use environment such as a room or a
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gymnasium It is possible to automatically change the rectangular shape formed in the correction
throat portion 22 to any dimension shorter than the dimension 2p in the longitudinal direction of
the slit-like outlet opening 22b, thereby providing a speaker system 20 'having a good usability.
Can.
[0114]
In the first and second embodiments described above, when attaching the adapter horn for
changing the sound wave directivity angle according to the present invention to the tip of the
horn in order to expand the sound wave directivity, the throat part in the horn (a throat for
sound wave path length correction Section corrects the acoustic path length of the acoustic wave
input from the inlet opening connected to the sound source in the sound path, narrows the
acoustic wave directivity angle in the longitudinal direction from the rectangular outlet opening,
and Although it is made to discharge so that it may become rectangular plane-like, it is not
restricted to this, and the throat part in a horn makes sound wave input from the entrance
opening connected to the sound source, and sound wave from the rectangular exit opening Any
form of construction is acceptable as long as it is emitted at a predetermined narrow sound wave
directing angle in the longitudinal direction.
[0115]
According to the above, even when a horn speaker having a narrow sound wave directivity angle
is installed at a high position, the sound wave directivity can be expanded only by attaching the
sound wave directivity angle changing adapter horn according to the present invention to the tip
of the horn. In addition, it is easy to attach the sound wave directivity angle changing adapter
horn to the tip of the horn.
[0116]
It is the perspective view which showed the adapter horn for sound wave directivity angle
change of Example 1 which concerns on this invention, and a horn speaker system.
The horn speaker system of Example 1 which concerns on this invention WHEREIN: It is the
perspective view which showed the state which connected the throat part for sound-wave path |
pass length compensation in a horn to the speaker.
(A), (b) is the perspective view which looked at the sound-wave path length compensation throat
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part in a horn in the horn speaker system of Example 1, respectively from the right side and the
left side.
(A) to (f) are a rear view, a longitudinal sectional view, a front view, and an AA sectional view
showing a throat portion for sound wave path length compensation in the horn in the horn
speaker system according to the first embodiment of the present invention. It is a top view and
the use range figure of a hyperbola.
A plurality of sound path length correction paths set in the sound path of the sound path length
correction throat portion so that the wave front of the sound wave emitted from the sound path
length correction throat to the adapter mounting horn portion has a rectangular planar shape. It
is the figure which showed typically the case where each sound wave optical path length is
correct | amended.
(A)-(d) is the front view which showed the adapter horn for sound wave directivity angle change
which becomes the principal part of Example 1, a bottom view, the right side, and a rear view.
(A)-(c) is the front view which showed the state which attached the adapter horn for sound wave
directivity angle change which becomes the principal part of Example 1 to the horn part for
adapter attachment in a horn, a bottom view, right side.
(A)-(c) shows the state which attached the adapter horn for sound wave directivity angle change
of the modification to which the adapter horn for sound wave directivity angle change of
Example 1 was partially deformed to the horn part for adapter attachment in a horn Front view,
bottom view, right side view.
It is the perspective view which showed the adapter horn for sound wave directivity angle
change of Example 2 which concerns on this invention, and the horn speaker system.
(A), (b) is the AA speaker sectional view in the horn speaker system of Example 2, and an AA
sectional view and a side sectional view showing a throat part for sound wave path length
amendment in a horn.
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(A)-(c) is the front view which showed the state which attached the adapter horn for sound wave
directivity angle change which becomes the principal part of Example 2 to the horn part for
adapter attachment in a horn, a bottom view, right side.
(A)-(c) shows the state which attached the adapter horn for sound wave directivity angle change
of the modification which changed the adapter horn for sound wave directivity angle change of
Example 2 in part to the horn part for adapter attachment in a horn Front view, bottom view,
right side view.
It is the figure typically shown in order to demonstrate a common horn speaker.
In the conventional horn speaker, it is the longitudinal cross-sectional view which showed the
sound path in a throat part.
Explanation of sign
[0117]
DESCRIPTION OF SYMBOLS 10 Speaker system of Example 1 10 'Speaker system of the
modification which partially deformed Example 11 11 Sound source (speaker) 12 Horn 13
Throat part for acoustic path length correction 13 L Left throat part, 13R: right throat part, 13a:
inlet opening, 13b: outlet opening, 13c: left side, 13d: right side, 13e, upper side, 13f, lower side,
13g, sound path, 14: for mounting the adapter Horn portion 14a: inlet opening 14b: outlet
opening 14c: flange 14c1: screw hole 14d: left side surface 14e: right side surface 14f: upper
side surface 14g: lower side surface 15: screw 16: embodiment 1, 2 adapter horns for changing
the sound wave pointing angle 16 ′: adapter horns for changing the sound wave pointing angle
according to a modification of the first and second embodiments 16a: inserted Opening, 16b:
Outlet opening, 16c: Flange, 16c1: Mounting hole, 16d: Left side, 16e: Right side, 16f: Upper side,
16g: Lower side, 17: Drive source, 18: Sound wave direction angle setting means, 20 Speaker
system according to the second embodiment 20 'Speaker system according to a modification of
the second embodiment 21 Horn 2 Throat portion for sound wave path length correction 22a
entrance opening 22b exit opening 22r ... sound path, D1 to D3 ... branch path, t1 to t8 ... outlet,
CO ... center axis of sound path, AL ... design reference sound path length of one sound path
length correction path passing on center axis of sound path, oa ', ob', oc ', od', oe ', of', og '...
plural acoustic path length correction paths, 2 p ... longitudinal direction of the rectangular outlet
opening formed in the acoustic path length correction throat portion Dimension, 2p '... sound
wave finger Longitudinal dimension of the rectangular inlet opening formed on the angle change
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adapter horn, 2α ... Longitudinal direction of the sound wave direction of the rectangular outlet
opening formed on the throat portion for correcting the acoustic path length, 2α '... The acoustic
wave pointing angle in the longitudinal direction of the rectangular inlet opening formed on the
sonication angle changing adapter horn.
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