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JP2017022603

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DESCRIPTION JP2017022603
Abstract: [Problem] A sound wave in frequency bands other than a specific frequency is not
affected, and it is easy to design a phase plug while preventing deterioration of sound quality
caused by standing waves. A horn speaker 1 is a phase plug 96 having a plurality of slits 92a and
92b formed around a central axis ax, and an open end of one slit 92a of the plurality of slits on
the diaphragm 87 side. The path length of the path from a1 to the sound emitting side tip a3 ′
of the phase plug and passing through the other slit 92b adjacent to the slit to the opening end
a1 varies depending on the position in the circumferential direction of the slit It has a plug 96.
According to this configuration, since the path length affecting the wavelength of the standing
wave changes, the generation of the standing wave is prevented, and the deterioration of the
sound quality due to the standing wave is prevented. [Selected figure] Figure 2
ホーンスピーカおよびフェイズプラグ
[0001]
The present invention relates to a horn speaker and a phase plug.
[0002]
The horn speaker is obtained by adding a horn to a compression driver in order to improve the
directivity of sound.
FIG. 9 is a longitudinal sectional view of the conventional horn speaker 4. Of the configuration
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shown in FIG. 9, the portion excluding the horn 84 is a compression driver. As shown in FIG. 9,
the throat portion 94 of the horn 84 is fixed to one end surface of the back plate 80 of the
compression driver. In the back plate 80, one bottom surface of the pole piece 85 is fixed to the
end surface opposite to the horn 84. In the center of the back plate 80 and the pole piece 85, a
sound introducing hole 83 which penetrates both and reaches the throat portion 94 of the horn
84 is provided. The bottom surface of the pole piece 85 opposite to the back plate 80 is recessed
in a bowl shape toward the sound introducing hole 83, and a phase plug 86 is fitted in the bowlshaped surface. The phase plug 86 has an axially symmetrical shape with respect to the central
axis ax of the horn speaker 4. Further, the phase plug 86 is formed with a plurality of slits 91
which are axially symmetrical with respect to the central axis ax. Here, the slit 91 is an elongated
space that brings the space behind the phase plug 86 into communication with the space in front
of the phase plug 86 (that is, the sound introducing hole 83). A diaphragm 87 is supported
behind the phase plug 86 at a constant interval. The diaphragm 87 has a semi-spherical shape
curved in a dome shape, and a cylindrical voice coil bobbin 88 is provided on the outer
peripheral portion thereof.
[0003]
On the end face of the back plate 80 opposite to the horn 84, there are an annular magnet 82
and a top plate 81 having the same diameter as the back plate 80, and the annular magnet 82 is
sandwiched between the back plate 80 and the top plate 81 and supported. It is done. The
annular magnet 82 has an N pole on one bottom surface (for example, the bottom surface on the
back plate 80 side) and an S pole on the other bottom surface (for example, the bottom surface
on the top plate 81 side).
[0004]
The inner peripheral surface of the top plate 81 faces the outer peripheral surface of the pole
piece 85 at a minute interval. The magnetic loop consisting of the back plate 80, the annular
magnet 82, the top plate 81, the phase plug 86, and the pole piece 85 constitutes a magnetic
circuit that causes the magnetic lines of force generated by the annular magnet 82 to make a
circuit. . In the magnetic circuit, the diaphragm 87 is supported in a state in which the voice coil
bobbin 88 at the peripheral end is accommodated in the magnetic gap AG between the inner
peripheral surface of the top plate 81 and the outer peripheral surface of the pole piece 85.
[0005]
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The configuration for supporting the diaphragm 87 is as follows. First, a spacer ring 90 is fixed
to the end surface of the top plate 81 opposite to the annular magnet 82. An edge 89 is
interposed between the inner peripheral surface of the spacer ring 90 and the outer peripheral
portion of the diaphragm 87. The edge 89 serves to support the diaphragm 87.
[0006]
In the horn speaker 4 having the above configuration, the magnetic flux generated by the
annular magnet 82 passes through the magnetic gap AG between the top plate 81 and the pole
piece 85. Then, when current flows through the voice coil in the voice coil bobbin 88, a driving
force in a direction parallel to the central axis ax of the horn speaker 4 is applied to the voice coil
bobbin 88, and the diaphragm 87 fixed to the voice coil bobbin 88 vibrates. . When the
diaphragm 87 vibrates, the air in the space OS between the diaphragm 87 and the phase plug 86
is pushed or pulled back to the sound introducing hole 83 through the slits 91 of the phase plug
86 due to the vibration. Then, the compressional waves of the pushed and pulled back air are
emitted as sound waves from the horn 84 via the sound guide holes 83.
[0007]
The horn speaker 4 has a back cover 95 covering the diaphragm 87 on the opposite side of the
phase plug 86 with the diaphragm 87 interposed therebetween. In the horn speaker 3, when the
diaphragm 87 vibrates at a certain frequency, the sound wave traveling from the diaphragm 87
to the phase plug 86 and the sound wave traveling to the back cavity BC surrounded by the
diaphragm 87, the edge 89, the spacer ring 90 and the back cover 95 A standing wave is
generated in the space OS, the surrounding space communicating with the space OS, and the
back cavity BC. Due to this standing wave, a dip is generated in the frequency characteristics of
the horn speaker 4 which should be flat, and the sound quality of the horn speaker 4 is
deteriorated. The reason is as follows.
[0008]
FIG. 10 exemplifies the position where the node of the standing wave is generated in the
longitudinal sectional view of the conventional horn speaker 4 shown in FIG. In FIG. 10, the
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opening end on the space OS side of the slit 91a on the outermost periphery of the phase plug
86 is the opening ends a1 and b1. Furthermore, the opening end on the space OS side of the
second slit 91b from the outermost periphery of the phase plug 86 is the opening ends a2 and
b2. Furthermore, the outermost peripheral portions of the horn 84 side tip of the phase plug 86
are designated as tips a3 and b3.
[0009]
In the horn speaker 4, an intermediate position between the space OS-side opening end of the
outermost circumference slit 91a of the phase plug 86 and the space OS-side opening end of the
second slit 91b from the outermost circumference (that is, the middle between the opening ends
a1 and a2 Position, the middle position between the open ends b1 and b2) A, the position of the
outermost peripheral portion of the tip on the horn 84 side of the phase plug 86 (ie, tips a3 and
b3) B, and the tip on the horn 84 side of the voice coil bobbin 88 A standing wave is generated,
each having a node at position C.
[0010]
In the horn speaker 4, when a standing wave whose half wavelength is the length of the path
between the position A between the open ends a1 and a2 and the tip a3 is generated, a node of
the standing wave is generated at the tip a3. A dip occurs in the frequency characteristic of the
horn speaker 4.
Hereinafter, this dip is referred to as a dip due to a standing wave having a node at the tip a3.
When a standing wave whose half wavelength is the length of the path between the position A
between the open ends b1 and b2 and the tip b3 is generated, a node of the standing wave is
generated at the tip b3. A dip occurs in the characteristics. Hereinafter, this dip is referred to as a
dip due to a standing wave having a node at the tip b3. Here, in the horn speaker 4, the slit 91 a
at the outermost periphery of the phase plug 86 and the second slit 91 b from the outermost
periphery have a shape axially symmetrical with respect to the central axis ax. Therefore, the
wavelength of the standing wave having a node at the tip a3 coincides with the wavelength of the
standing wave having a node at the tip b3. Therefore, in the horn speaker 4, the dip resulting
from the standing wave having a node at the tip a3 and the dip resulting from the standing wave
having a node at the tip b3 overlap at the same frequency. The longitudinal cross-sectional shape
of the horn speaker 4 cut by one plane including the central axis ax has been described above as
an example, but the same phenomenon occurs in the vertical cross-sectional shape of the horn
speaker 4 cut by another plane including the central axis ax Do. As a result, a noticeable dip
occurs in the frequency characteristics of the horn speaker 4 and the sound quality of the horn
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speaker 4 is degraded.
[0011]
Various techniques for suppressing the standing wave that causes the sound quality deterioration
of such a horn speaker 4 have been proposed. For example, in the technology disclosed in Patent
Document 1, a standing wave is suppressed by providing a sound absorbing material in the back
cavity. In the technology disclosed in Patent Document 2, the standing waves are suppressed by
changing the cross-sectional area and position of each slit of the phase plug.
[0012]
Japanese Patent Application Laid-Open No. 56-140799 Patent No. 5017360
[0013]
However, when a sound absorbing material is provided as in the technique disclosed in Patent
Document 1, the sound absorbing material may cause deterioration of the sound quality of the
horn speaker.
This is because the sound absorbing material absorbs not only the frequency band of the
standing wave to be suppressed but also the sound waves in other frequency bands. In addition,
when the cross-sectional area and the position of each slit of the phase plug are changed as in
the technique disclosed in Patent Document 2, it is possible to suppress the standing wave and to
prevent the sound quality deterioration of the horn speaker. However, if the cross-sectional area
or position of each slit of the phase plug is changed even a little, the frequency characteristics of
the horn speaker will change significantly, so many simulations and trial manufactures of horn
pickers are performed to suppress standing waves to be suppressed. It becomes necessary and
consequently the design of the phase plug becomes difficult. Therefore, it is difficult to easily
suppress standing waves. As described above, even with the techniques disclosed in Patent
Document 1 and Patent Document 2, it is difficult to completely suppress the standing wave.
[0014]
The present invention has been made in view of the problems described above, and it is easy to
design a phase plug in a compression driver or a horn speaker, and it is determined without
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absorbing sound waves in frequency bands other than a specific frequency. It is an object of the
present invention to provide a technology capable of suppressing a dip in frequency
characteristics of a compression driver or a horn speaker caused by a standing wave.
[0015]
In order to solve the above problems, according to the present invention, the path length of the
path extending from the open end on the diaphragm side of the slit to the open end around the
sound emitting tip and passing through the slit adjacent to the slit is the slit The present
invention provides a phase plug which is characterized by being different depending on the
position in the circumferential direction of.
In this phase plug, a plurality of slits are formed around a central axis, and the slit is one of the
plurality of slits.
[0016]
In the case of the conventional compression driver or horn speaker, the wavelength of the
standing wave that causes a dip in the frequency characteristic is constant, and the dips
generated in the frequency characteristic overlap, causing a noticeable dip in the frequency
characteristic. . However, according to the present invention, since the path length of the abovementioned path differs depending on the position in the circumferential direction of the slit, the
wavelength of the standing wave causing dips in the frequency characteristics of the
compression driver or horn speaker does not concentrate on a specific wavelength. Therefore, it
is possible to suppress the occurrence of a significant dip in the frequency characteristics of the
compression driver or the horn speaker, and to prevent the sound quality deterioration of the
compression driver or the horn speaker due to the standing wave.
[0017]
As another mode, a path from the opening end on the diaphragm side of the slit to the sound
emitting side tip of the partition plate mounted on the sound emitting side tip and reaching the
opening end via the slit adjacent to the slit The present invention provides a phase plug
characterized in that the path length of L varies according to the circumferential position of the
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slit. In this phase plug, a plurality of slits are formed around a central axis, and the slit is one of
the plurality of slits. According to this aspect, since the path length of the above path differs
depending on the position in the circumferential direction of the slit, it is possible to suppress the
occurrence of a noticeable dip in the frequency characteristics of the compression driver or the
horn speaker, and it is caused by the standing wave. It is possible to prevent the deterioration of
the sound quality of the compression driver or the horn speaker.
[0018]
In another aspect, at least a part of the path from the open end to the sound emitting tip is a
curved shape. In another aspect, at least a part of the path from the open end to the sound
emitting side tip of the partition plate has a curved shape. According to these aspects, it is
possible to shorten the length of the compression driver or the horn speaker parallel to the
central axis in the winding direction of the slit.
[0019]
Another aspect of the present invention is to provide a horn speaker having a horn for emitting a
sound wave into space and the phase plug of any of the above aspects.
[0020]
It is the rear view which looked at the phase plug 96 of the horn speaker 1 which is 1st
Embodiment of this invention from the direction which goes to the horn 84 from the back cover
95. FIG.
It is the longitudinal cross-sectional view which cut | disconnected the horn speaker 1 in the
plane containing the Y-Y 'line | wire of FIG. 1, and the central axis ax. It is the longitudinal crosssectional view which cut | disconnected the horn speaker 1 in the plane containing the X-X 'line |
wire of FIG. 1, and the central axis ax. In the phase plug 96 in the same embodiment, from the
opening end on the space OS side of the slit 92a on the outermost periphery, it passes around the
sound emitting side tip of the phase plug 96 via the slit 92a, and passes on the second slit 92b
from the outermost periphery. It is a figure which shows the dependence with respect to angle
(theta) of central axis ax circumference of the phase plug 96 of the path length d of the path |
route which returns to the diaphragm 87 side open end. It is a longitudinal cross-sectional view
which illustrates the position which the node of the standing wave of the horn speaker 1
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produces. It is a longitudinal cross-sectional view of the horn speaker 2 of 2nd Embodiment of
this invention. It is a longitudinal cross-sectional view of the horn speaker 3 of 3rd Embodiment
of this invention. It is an enlarged view of the horn speaker 3 of the same. It is a longitudinal
cross-sectional view of the conventional horn speaker 4. FIG. It is a longitudinal cross-sectional
view which illustrates the position which the node of the standing wave of the horn speaker 4
produces.
[0021]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. First Embodiment FIG. 1 is a rear view of a phase plug 96 of a horn speaker 1
according to a first embodiment of the present invention as viewed from a direction from a back
cover 95 toward a horn 84. As shown in FIG. FIG. 2 is a longitudinal sectional view of the horn
speaker 1 cut along a plane including the Y-Y 'line of FIG. 1 and the central axis ax. FIG. 3 is a
longitudinal sectional view of the horn speaker 1 cut along a plane including the X-X ′ line of
FIG. 1 and the central axis ax.
[0022]
The horn loudspeaker 1 according to the present embodiment differs from the conventional horn
loudspeaker 4 (see FIGS. 9 and 10) in that it has a non-axially symmetrical shape with respect to
the central axis ax instead of the phase plug 86 axially symmetrical with respect to the central
axis ax. It is a point having a certain phase plug 96. The horn speaker 1 and the horn speaker 4
are the same except this point. Accordingly, in FIG. 1 to FIG. 3, the same components as those
shown in FIG. 9 and FIG. The following description will focus on the phase plug 96. The tips a3
and b3 of the phase plug 86 and the slits 91a and 91b correspond to the tips a3 'and b3' of the
phase plug 96 and the slits 92a and 92b, respectively.
[0023]
Since the phase plug 96 in the present embodiment has a non-axisymmetric shape with respect
to the central axis ax, the cross-sectional shape cut by a plane including the central axis ax
changes with the angle θ around the central axis ax of the plane. Assuming that a plane
including the YY 'line and the central axis ax in FIG. 1 is a reference plane, FIG. 2 is a longitudinal
sectional shape of the horn speaker 1 obtained by cutting the phase plug 96 by a plane of θ = 0
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° with respect to the reference plane. 3 shows the longitudinal cross-sectional shape of the horn
speaker 1 obtained by cutting the phase plug 96 at a plane of θ = 90 ° with respect to the
reference plane.
[0024]
As shown in FIG. 1, in the slit 92 of the phase plug 96 at the cut surface of the horn speaker 1
cut by the plane of the angle θ including the central axis ax, the phase at the space OS side open
end (namely, the diaphragm 87 side open end) Hereinafter, for the sake of convenience, the
length from the center point of the radial gap of the plug 96 to the tip on the horn 84 side of the
phase plug 96 of the slit 92 (that is, the tip on the sound emitting side) will be referred to as a slit
length. In the present embodiment, the slit length of the slit 92a and the slit length of the slit 92b
adjacent to the slit 92a are always equal. However, the tip on the horn 84 side of the phase plug
96 is common to the slit length of the slit 92a and the slit length of the slit 92b. Furthermore, the
slits 92a and 92b adjacent to each other in the cut surface of the horn speaker 1 cut by the plane
of the angle θ including the central axis ax (for example, slits 92a and 92b shown above the
central axis ax in FIG. 2) In the space OS side open end (in this example, the open end a1) of the
slit 92a, from the center point of the radial gap of the phase plug 96, the horn 84 side tip of the
phase plug 96 (this example Then, turn around the tip a3 ′), turn around the center point of the
radial gap of the phase plug 96 at the space OS side open end (the open end a2 in this example)
of the slit 92b via the slit 92b, The center point of the radial gap of the phase plug 96 at the open
end on the space OS side (open end a1 in this example) The path length of the route, the
following, for convenience, referred to as the path length of one round of the outermost. As
shown in this example, the horn 84 side end of the phase plug 96 is surrounded not by the horn
84 side tip of the phase plug 96 adjacent to the pole piece 85 but by the slit 92a and the slit 92b.
The horn 84 side tips a3 'and b3' of the phase plug 96 are shown. This applies to the following
also including the case of the horn speaker 4.
[0025]
In the longitudinal cross-sectional view (θ = 0 °) shown in FIG. 2, the slit length of the slit 92a
(ie, the length of the path between the open end a1 and the tip a3 ′) shown on the upper side in
FIG. It is shorter than the slit length (that is, the length of the path between the open end b1 and
the tip b3 ') of the slit 92a shown on the side. For this reason, the path length for one round of
the outermost circumference shown on the upper side in FIG. 2 (that is, the length of the path
from the open end a1 to the tip a3 'to reach the open end a1 via the open end a2) Is shorter than
the path length of the outermost circumference shown on the lower side (that is, the length of the
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path from the open end b1 to the tip b3 'to reach the open end b1 via the open end b2) .
[0026]
In the longitudinal sectional view (θ = 90 °) shown in FIG. 3, the slit length of the slit 92a (ie,
the length of the path between the open end a1 and the tip a3 ′) shown on the upper side in
FIG. It is equal to the slit length of the slit 92a shown on the side (ie, the length of the path
between the open end b1 and the tip b3 '). Then, as described above, the slit length of the slit 92a
and the slit length of the slit 92b adjacent to the slit 92a are always equal. For this reason, the
path length for one round of the outermost periphery shown on the upper side in FIG. 3 (that is,
the length of the path from the open end a1 to the tip a3 'and passing through the open end a2
to the open end a1) Is equal to the path length of the outermost circumference shown on the
lower side (that is, the length of the path from the open end b1 to the tip b3 'to the open end b2
via the open end b2).
[0027]
FIG. 4 is a view showing the dependency of the path length d for one round on the outermost
circumference on the angle θ around the central axis ax of the phase plug 96. As shown in FIG.
The vertical axis d in FIG. 4 indicates the path length d of the outermost circumference, and the
horizontal axis θ indicates the central axis of the phase plug 96 with the plane including the YY
′ line in FIG. 1 and the central axis ax as a reference plane. The angle θ around the central axis
ax of the plane including ax is shown. As shown in FIG. 4, when θ = 0 °, the path length d of the
outermost circumference is one minimum value dmin, and the path length d of the outermost
circumference gradually becomes θ until θ = 180 °. When it becomes large and θ = 180 °,
the path length d for one round on the outermost circumference becomes the maximum value
dmax. After that, the path length d for one round of the outermost circumference gradually
decreases until θ = 360 °, and when θ = 360 °, the path length d for one round of the
outermost circumference returns to the minimum value dmin. As described above, the path
length d for one turn of the outermost circumference differs depending on the position of the slit
92 in the circumferential direction. That is, the slit length of the slit 92 a of the phase plug 96
differs depending on the position of the slit 92 in the circumferential direction. The winding
direction is the direction around the central axis ax of the phase plug 96, as shown in FIG.
According to the simulation confirmed by the inventors of the present invention, even if the path
length d of one circumference of the outermost periphery is shortened or lengthened by about
10%, the dip frequency generated in the frequency characteristic of the horn speaker 1 is There
is no change. Therefore, in order to suppress the dip generated in the frequency characteristics
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of the horn speaker 1, the maximum value dmax is longer by at least 10% or more than the
minimum value dmin for the path length of one circumference of the outermost circumference
shown in FIG. desirable. This is the same as in the other embodiments.
[0028]
In the present embodiment, the slit lengths of the plurality of slits 92 provided in the phase plug
96 are different from each other, and differ depending on the position of the slits 92 in the
circumferential direction. The length up to the boundary between the sound introducing hole 83
and the horn 84 is equal at any position in the circumferential direction of each slit 92,
regardless of which slit 92 is. Therefore, the phase of the sound wave generated in the space OS
does not shift from the opening end on the space OS side of the slit 92 to the boundary between
the sound guiding hole 83 and the horn 84, and the horn is generated by overlapping sound
waves of different phases. It is possible to prevent the sound quality of the speaker 1 from being
deteriorated.
[0029]
According to the present embodiment, since the path length d of the outermost slit 92a in the
phase plug 96 differs depending on the position in the circumferential direction of the slit 92a,
the dip generated in the frequency characteristic of the horn speaker 1 is suppressed, It is
possible to prevent the deterioration of the sound quality of the horn speaker 1 resulting from it.
The reason is as follows.
[0030]
FIG. 5 is a diagram illustrating the position where the node of the standing wave of the horn
speaker 1 occurs. Similarly to FIG. 2, FIG. 5 is also a longitudinal sectional view (θ = 0 °) of the
horn speaker 1 cut along a plane including the Y-Y ′ line of FIG. 1 and the central axis ax. In the
horn speaker 1 as well, a standing wave having nodes at positions A to C similar to the horn
speaker 4 is generated.
[0031]
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In the horn speaker 1, when a standing wave whose half wavelength is the length of the path
between the position A between the open ends a1 and a2 and the tip a3 'is generated, a node of
the standing wave is generated at the tip a3' Therefore, a dip occurs in the frequency
characteristic of the horn speaker 1. Hereinafter, this dip is referred to as a dip due to a standing
wave having a node at the tip a3 '. When a standing wave whose half wavelength is the length of
the path between the position A between the open ends b1 and b2 and the tip b3 'is generated, a
node of the standing wave is generated at the tip b3'. Dip occurs in the frequency characteristics
of Hereinafter, this dip is referred to as a dip due to a standing wave having a node at the tip b3 '.
Here, in the horn speaker 1, the slit 91a and the slit 91b have a non-axially symmetric shape with
respect to the central axis ax. Therefore, the wavelength of the standing wave having a node at
the tip a3 'does not coincide with the wavelength of the standing wave having a node at the tip
b3'. Therefore, in the horn speaker 1, it is possible to prevent the dip caused by the standing
wave having a node at the tip a3 'and the dip resulting from the standing wave having a node at
the tip b3' at the same frequency. Therefore, it is possible to suppress the occurrence of a
noticeable dip in the frequency characteristics of the horn speaker 1. Therefore, according to the
present embodiment, the sound quality deterioration of the horn speaker 1 can be prevented.
[0032]
In the horn speaker 1, the slit length of the slit 92 a shown on the upper side in the longitudinal
sectional view (θ = 0 °) shown in FIG. 2 is shorter than the slit length of the slit 92 a shown on
the lower side. For example, the slit length of the slit 92a shown on the upper side may be longer
than the slit length of the slit 92a shown on the lower side. The point is that the shape of the
phase plug 96 is non-axisymmetric with respect to the central axis ax, and the slit length of the
slit 92a may be different depending on the position of the slit 92 in the circumferential direction.
That is, the path length of one turn of the outermost circumference may be different depending
on the position of the slit 92 in the circumferential direction.
[0033]
Second Embodiment FIG. 6 is a longitudinal sectional view of a horn speaker 2 according to a
second embodiment of the present invention cut along a plane including the Y-Y 'line and the
central axis ax in FIG. The horn speaker 2 according to the present embodiment differs from the
conventional horn speaker 4 (see FIGS. 9 and 10) in that it has a non-axially symmetrical shape
with respect to the central axis ax instead of the phase plug 86 axially symmetrical with respect
to the central axis ax. It is a point having a certain phase plug 98. The horn speaker 2 and the
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horn speaker 4 are the same except this point. Therefore, in FIG. 6, the same components as
those shown in FIG. 9 and FIG. 10 will be assigned the same reference numerals and explanations
thereof will be omitted. The following description will focus on the phase plug 98. The tips a3
and b3 of the phase plug 86 and the slits 91a and 91b correspond to the tips a3 "and b3" and
the slits 93a and 93b of the phase plug 98, respectively.
[0034]
In the conventional horn speaker 4 and the horn speaker 1 of the first embodiment, the wall
surface of the phase plug 86 facing the slit 91 and the wall surface of the phase plug 96 facing
the slit 92 It had a linear shape towards For example, in the longitudinal cross-sectional view
shown in FIG. 2, the path from the open end a1 to the tip a3 'is linear. However, in the horn
speaker 2 of the present embodiment, the wall surface of the phase plug 98 facing the slit 93 has
a curved shape from the opening end on the space OS side toward the tip on the horn 84 side.
For example, in the longitudinal cross-sectional view shown in FIG. 6, the path from the opening
end a1 to the tip a3 '' is a curved shape. As in the first embodiment, also in the present
embodiment, the slit length of the slit 93a (ie, the length of the path between the open end a1
and the tip a3 ′ ′) shown on the upper side in FIG. It is shorter than the slit length of the slit
93a shown on the side (ie, the length of the path between the open end b1 and the tip b3 ′ ′).
Further, as in the first embodiment, the slit length of the slit 93a differs depending on the
position of the slit 93 in the circumferential direction. In addition, the path length of one turn of
the outermost circumference also differs depending on the position of the slit 93 in the
circumferential direction. Further, for example, in the longitudinal cross-sectional view shown in
FIG. 6, the path from the opening end a1 to the tip a3 '' may be linear while the path from the
opening end b1 to the tip b3 '' may be curved. The point is that the path length of the outermost
circumference of one turn may be different depending on the position of the slit 93 in the
circumferential direction. That is, the slit length of the slit 93a may be different depending on the
position of the slit 93 in the circumferential direction. Therefore, according to the present
embodiment, for the same reason as the first embodiment, it is possible to suppress the dip
generated in the frequency characteristic of the horn speaker 2 and to prevent the sound quality
deterioration of the horn speaker 2 due to the standing wave. it can.
[0035]
The horn speaker 2 according to the present embodiment is effective, for example, when the
length of the phase plug 98 along the central axis ax has to be shortened in design. In such a
case, if the wall surface of the phase plug 98 facing the slit 92 has a linear shape from the
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opening end on the space OS side to the tip on the horn 84 side as in the horn speaker 1, the
path length of the slit 92a on the outermost periphery It becomes difficult to make them
different depending on the position of the slit 92 in the circumferential direction. Therefore, the
dip generated in the frequency characteristic of the horn speaker 1 can not be suppressed.
However, in the case of the horn speaker 2, the wall surface of the phase plug 98 facing the slit
93 has a curved shape from the opening end on the space OS side toward the tip on the horn 84
side, the length along the central axis ax of the phase plug 98 Even if the distance is short, the
path length of the outermost slit 93a can be made different depending on the position of the slit
93 in the circumferential direction. Therefore, it is possible to suppress the dip generated in the
frequency characteristic of the horn speaker 2 and to prevent the sound quality deterioration of
the horn speaker 2 caused by the standing wave.
[0036]
In the present embodiment, all of the wall surfaces of the phase plug 98 facing the slit 93 have a
curved shape from the opening end on the space OS side toward the tip on the horn 84 side, but
a central axis facing at least the slit 93a on the outermost periphery The wall surface of the
phase plug 98 in the ax direction may have a curved shape from the opening end on the space
OS side toward the tip on the horn 84 side. In such an embodiment, the path length of the
outermost slit 93a can be made different depending on the position of the slit 93 in the
circumferential direction. Therefore, it is possible to suppress the dip generated in the frequency
characteristic of the horn speaker 2 and to prevent the sound quality deterioration of the horn
speaker 2 caused by the standing wave.
[0037]
Third Embodiment FIG. 7 is a longitudinal sectional view of a horn speaker 3 according to a third
embodiment of the present invention cut along a plane including the Y-Y 'line and the central
axis ax of FIG. The horn speaker 3 according to the present embodiment differs from the
conventional horn speaker 4 (see FIGS. 9 and 10) in that the partition plate 97 is attached to the
tip on the horn 84 side of the phase plug 86 axially symmetrical with respect to the central axis
ax. is there. The horn speaker 3 and the horn speaker 4 are the same except this point. Therefore,
in FIG. 7, the same components as those shown in FIG. 9 and FIG. 10 will be assigned the same
reference numerals and descriptions thereof will be omitted.
[0038]
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In the phase plug 86 of the horn speaker 3, the partition plate 97 has an annular shape, and the
outermost peripheral portion of the horn 84 side end of the phase plug 86 (that is, the outermost
peripheral portion of the sound emitting side front end of the phase plug 86) One end of the
cable is fixed, for example, with an adhesive, and is mounted so as to extend in the direction of
the horn 84. Further, the length from the end on the phase plug 86 side of the annular partition
plate 97 to the end on the horn 84 side (hereinafter referred to as "length of the partition plate
97") differs depending on the position in the circumferential direction of the annular ring . In the
longitudinal sectional view shown in FIG. 7, the length of the partition plate 97 shown on the
upper side in FIG. 7 (ie, the length of the path between the tip a3 and the tip a4) is the partition
plate 97 shown on the lower side. (Ie, the length of the path between the tip b3 and the tip b4).
Here, in the example shown in FIG. 7, the wall surface of the partition plate 97 has a linear shape
from the end on the phase plug 86 side toward the end on the horn 84 side. However, the wall
surface of the partition plate 97 may have a curved shape. For example, in the longitudinal crosssectional view shown in FIG. 7, while the path from the tip a3 to the tip a4 is made linear, the
path from the tip b3 to the tip b4 may be made curved. The point is that the length of the
partition plate 97 may be different depending on the position of the annular plate of the partition
plate 97 in the circumferential direction.
[0039]
Since the partition plate 97 is attached to the end on the horn 84 side of the phase plug 86, in
the horn speaker 3, the total length of the slit length of the slit 91 on the outermost periphery of
the phase plug 86 and the length of the partition plate 97 is , And the position of the slit 91 in
the circumferential direction. That is, the total length of the path length of the outermost
circumference and the length twice the length of the partition plate 97 differs depending on the
position of the slit 91 in the circumferential direction. Therefore, for the same reason as the first
embodiment, it is possible to suppress the dip generated in the frequency characteristic of the
horn speaker 3 and to prevent the sound quality deterioration of the horn speaker 3 caused by
the standing wave.
[0040]
Any material can be used as the material of the partition plate 97 as long as it is a material
having high rigidity such as a wood board or a resin. The same material as the phase plug 86
may be used. If the divided vibration is generated in the partition plate 97 by the emitted sound,
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the sound quality of the emitted sound may be adversely affected. The material of the partition
plate 97 may be any material that can ensure the rigidity capable of avoiding the occurrence of
the divided vibration. Furthermore, it is preferable that the raw material of the partition plate 97
is a raw material which does not have permeability with respect to the sound wave generated in
the space OS. Of the sound waves generated in the space OS due to the vibration of the
diaphragm 87, the sound wave passing through the slit 93a of the phase plug 86 and the sound
wave passing through the slit 93b are merged for the first time at the tip of the partition plate 97
on the horn 84 side In order to
[0041]
In the case of the horn speaker 3 of this embodiment, for example, even if the shape of the phase
plug 86 is axially symmetrical with respect to the central axis ax like the conventional horn
speaker 4, the horn 84 side of the phase plug 86 is It is possible to suppress the dip generated in
the frequency characteristic of the horn speaker 4 and prevent the sound quality deterioration of
the horn speaker 4 due to the standing wave only by attaching the partition plate 97 to the tip.
That is, in the case of the horn speaker 3 of the present embodiment, simply by attaching the
partition plate to the phase plug of the existing horn speaker, the dip occurring in the frequency
characteristic of the existing horn speaker can be suppressed inexpensively, It is possible to
prevent the sound quality deterioration of the horn speaker caused by the waves.
[0042]
However, as in the first embodiment, in the horn speaker 3 as well, all the distances from the
opening end on the diaphragm 87 side of each slit 91 to the boundary between the sound
introducing hole 83 and the horn 84 via the slit 91 are equal. Therefore, the phase of the sound
wave generated in the space OS does not shift from the opening end on the space OS side of the
slit 91 to the boundary between the sound guiding hole 83 and the horn 84, and the sound
quality is generated by overlapping sound waves of different phases. Deterioration can be
prevented.
[0043]
<Modifications> (1) In the above embodiments, each horn speaker has a slit for two layers. For
example, in the horn speaker 1 according to the first embodiment, the slits 92 a and 92 b are
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provided. However, the number of layers of slits is not limited to two.
[0044]
(2) The above embodiments may be combined. For example, by combining the second
embodiment and the third embodiment, the wall surface of the phase plug 98 facing the slit 93
has a curved shape from the opening end on the space OS side toward the tip on the horn 84
side. The partition plate 97 may be attached to the outermost periphery of the horn 84 side end.
In this aspect, the shapes of the phase plug 98 and the partition plate 97 are non-axial symmetric
with respect to the central axis ax. Also according to this aspect, the total length of the slit length
of the slit 93 a and the length of the partition plate 97 differs depending on the position of the
slit 93 in the circumferential direction. That is, in this aspect, the total length of the path length
of the outermost circumference and the length twice the length of the partition plate 97 differs
depending on the position of the slit 93 in the circumferential direction.
[0045]
(3) The phase plug 98 of the second embodiment may be formed by, for example, casting or
injection molding, or may be formed by cutting out a block. Alternatively, the components of the
phase plug 98 surrounded by the slits 93 and the slits 93 adjacent to the slits 93 may be formed,
and the components may be combined to form the phase plug 98. This applies to the phase plug
96 of the first embodiment.
[0046]
(4) In the second embodiment, the entire wall surface of the phase plug 98 facing the slit 93 has
a curved shape, but a part of the wall surface may have a curved shape, and the remaining
portions may have a linear shape. For example, in the longitudinal cross-sectional view shown in
FIG. 6, of the path from the open end a1 to the tip a3 '', the section near the open end a1 may be
linear and the section other than the open end a1 may be curved. This also applies to the third
embodiment. For example, in the longitudinal cross-sectional view shown in FIG. 7, in the path
from the tip a3 to the tip a4, the section near the tip a3 is made linear and the section other than
the tip a3 is curved It may be a shape. Of course, the aspect which combined these 2nd
Embodiment and 3rd Embodiment may be taken. That is, in this combined mode, for example, in
the longitudinal cross-sectional view shown in FIG. 7, at least a part of the path from the open
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end a1 to the tip a4 has a curved shape.
[0047]
(5) In the third embodiment, one end of the partition plate 97 is fixed to the end of the phase
plug 86 on the horn 84 side with an adhesive, but the fixing method is not limited to this. As long
as one end of the partition plate 97 can be fixed to the tip of the phase plug 86 on the horn 84
side, any form may be used. For example, the end on the horn 84 side of the phase plug 86 may
have a concave shape, and the end on the phase plug 86 side of the partition plate 97 may have
a convex shape corresponding to the concave shape. FIG. 8 is an enlarged view of the horn 84
side tip of the phase plug 86 of such an embodiment and the space OS side tip of the partition
plate 97. As shown in FIG. 8A, the horn 84 side end of the phase plug 86 is processed into a
concave shape, and the space OS side end of the partition plate 97 is processed into a convex
shape, as shown in FIG. The phase plug 86 and the partition plate 97 may be fixed by inserting
the latter into the former. Fixing as shown in FIG. 8 is more firmly fixed than fixing with an
adhesive or the like. The tip shapes of the phase plug 86 and the partition plate 97 may be
reversed.
[0048]
(6) In each of the above embodiments, the diaphragm 87 has a dome shape, but the shape of the
diaphragm 87 is not limited to the dome shape. For example, when the present invention is
applied to a flat speaker, the diaphragm 87 is flat.
[0049]
(7) In the horn speaker, the sound emitting surface of the diaphragm 87 is curved in a convex
shape with respect to the sound output direction, and the sound emitting surface of the
diaphragm 87 is curved in a concave shape with respect to the sound output direction There is a
rear type. Although all the horn speakers in the above embodiments are of the rear type, the
present invention may be applied to a front type horn speaker.
[0050]
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(8) Production, use, transfer, loan, export, import, transfer or loan offer of compression driver
alone (hereinafter referred to as "production etc.") excluding the horn 84 from the horn speaker
of each embodiment described above You may In addition, the production of the phase plug
alone in each of the above embodiments may be performed.
[0051]
(9) In each of the above embodiments, the slit length and the path length of one circumference of
the outermost periphery are on the space OS side in the slit of the phase plug on the cut surface
obtained by cutting the horn speaker by the plane of angle θ including central axis ax. Although
the center point of the radial gap of the phase plug at the opening end and the tip of the phase
plug on the horn 84 side of the slit are taken, any point of the gap and the horn 84 side of the
phase plug of the slit It may pass through the tip. For example, in the first embodiment, in the slit
92 of the phase plug 96 on the cut surface of the horn speaker 1 cut by the plane of the angle θ
including the central axis ax, the contact point between the slit 92 and the phase plug 96 on the
space OS side open end The length of the slit 92 to the tip of the phase plug 96 on the horn 84
side may be a slit length. Furthermore, in the slits 92a and 92b adjacent to each other in the cut
surface of the horn speaker 1 cut by the plane of the angle θ including the central axis ax, from
the contact point of the slit 92a at the space OS side open end of the slit 92a and the phase plug
96, Turn around the horn 84 side tip of the phase plug 96 via the slit 92a, turn around the
contact point of the slit 92b and the phase plug 96 at the space OS side open end of the slit 92b
via the slit 92b, open the space of the slit 92a The path length of the path from the slit 92 b at
the OS side open end to the contact point of the phase plug 96 may be the path length of one
circumference of the outermost circumference.
[0052]
1, 2, 3, 4 ... horn speaker, 80 ... back plate, 81 ... top plate, 82 ... annular magnet, 83 ... sound
conduction hole, 84 ... horn, 85 ... pole piece, 86, 96, 98: phase plug, 87: diaphragm, 88: voice
coil bobbin, 89: edge, 90: spacer ring, 91, 92, 93: slit, 91a, 92a, 93a: slit on the outermost
periphery , 91b, 92b ...... second slit from the outermost periphery, 94 ス ロ ー throat portion 95
バ ッ ク back cover, 97 仕切 り partition plate, ax central axis, OS 空間 space AG gap magnetic
gap BC ...... Back cavity, a1, a2, b1, b2 ... opening end, a3, b3, a3 ', b3', a3 '', b3 '', a4, b4 ... tip.
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