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DESCRIPTION JP2011244052

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DESCRIPTION JP2011244052
To flatten reproduction frequency characteristics of a horn speaker. An edge (40) surrounds and
supports a diaphragm (17), and an outer peripheral portion of the edge (40) is fixed to an inner
peripheral wall (41) of a spacer ring (34). There is an air gap XS between the back plate 33 and
the spacer ring 34. There is a magnetic gap AG1 between the back plate 33 and the phase plug
16. A voice coil bobbin 39 extending toward the magnetic gap AG1 is fixed to the outer
peripheral portion of the diaphragm 17. A space OS1 between the diaphragm 17 and the phase
plug 16 is open to the outer peripheral wall 95 of the spacer ring 34 via the magnetic gap AG1
and the air gap XS. [Selected figure] Figure 2
ホーンスピーカ
[0001]
The present invention relates to a horn speaker having a phase plug provided with a slit.
[0002]
The horn speaker has a horn that radiates sound waves into space, a dome-shaped diaphragm,
and a phase plug (phase equalizer) that introduces the sound emitted from the diaphragm to the
throat portion of the horn. .
Among the horn speakers, there is one in which a phase plug provided with a slit is disposed
between the diaphragm and the horn. FIG. 7 is a longitudinal sectional view of this type of horn
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speaker 8. FIG. 8A is a view of the phase plug 70 of the horn speaker 8 as viewed from the
diaphragm 76 side.
[0003]
As shown in FIG. 7, the phase plug 70 of the horn speaker 8 has slits between the conical
member 71, an annular member 72 surrounding the outer periphery of the conical member 71,
and an annular member 73 surrounding the outer periphery of the annular member 72. It has a
structure in which 74 and 75 are left open and partially connected. The sound collecting surface
87 facing the diaphragm 76 in the phase plug 70 is curved along the diaphragm 76. Then, as
shown in FIG. 8A, each of the slits 74 and 75 in the sound collecting surface 87 has an annular
shape with a uniform distance from the center of the sound collecting surface 87.
[0004]
An annular magnet 79 is embedded in the annular member 73 of the phase plug 70. The annular
magnet 79 has an N pole on one bottom surface (for example, a bottom surface on the side of the
horn 77) and an S pole on the opposite bottom surface. Around the phase plug 70 is a pole piece
80. The phase plug 70, the annular magnet 79, and the pole piece 80 constitute a magnetic
circuit that causes magnetic lines of force generated by the annular magnet 79 to go around.
[0005]
A magnetic gap AG is present between the outer peripheral wall 81 of the phase plug 70 and the
inner peripheral wall 82 of the pole piece 80. The magnetic flux circulating in the magnetic
circuit crosses this magnetic gap AG. A cylindrical voice coil bobbin 83 having a diameter smaller
than the diameter of the outer peripheral wall 81 of the phase plug 70 and smaller than the
diameter of the inner peripheral wall 82 of the pole piece 80 is fixed to the outer peripheral
portion of the diaphragm 76. A voice coil (not shown) is wound around the voice coil bobbin 83.
The diaphragm 76 is supported in such a state that the voice coil bobbin 83 is accommodated in
the magnetic gap AG.
[0006]
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The configuration for supporting the diaphragm 76 is as follows. A spacer ring 84 is fixed to the
end face of the pole piece 80. The annular edge 86 supports the outer peripheral portion of the
diaphragm 76 so as to surround the diaphragm 76, and the outer peripheral portion of the edge
86 is fixed to the inner peripheral wall 85 of the spacer ring 84.
[0007]
In the horn speaker 8 having the above-described configuration, when a current of an audio
signal flows through the voice coil of the voice coil bobbin 83, the voice coil bobbin 83 is given a
driving force in a direction parallel to the central axis ax of the phase plug 70. The diaphragm 76
fixed to the voice coil bobbin 83 vibrates. When the diaphragm 76 vibrates, the space OS
between the diaphragm 76 and the phase plug 70 is pushed and pulled back through the slits 74
and 75 of the phase plug 70. Then, the compression and compression waves of the pushed and
pulled back air are emitted as sound waves to the space outside the horn 77.
[0008]
Here, as shown in FIG. 7, the outer peripheral side of the space OS sandwiched between the
diaphragm 76 and the phase plug 70 is closed by the phase plug 70, the pole piece 80, the
spacer ring 84, and the edge 86. . Therefore, when the diaphragm 76 vibrates at a certain
frequency, a resonance phenomenon occurs in the space. As a result, a peak or dip occurs in the
reproduction frequency characteristic of the horn speaker 8 at the frequency at which the
resonance phenomenon occurs.
[0009]
In order to solve this problem, the phase plug 70 of the conventional horn speaker 8 is provided
with design measures as described below. FIG. 8B shows the diaphragm 76 vibrating in such a
state that one node is formed concentrically with respect to the center thereof (hereinafter, this
state is referred to as “first-order mode”). FIG. FIG. 8 (C) is a diagram showing the diaphragm
76 vibrating in a state in which two nodes are formed concentrically with respect to the center
thereof (hereinafter, this state is referred to as “second mode”). It is. For the sake of simplicity,
FIGS. 8B and 8C show the vibration of the diaphragm 76 in a linear form. In the phase plug 70 of
the conventional horn speaker 8, as shown in FIGS. 8 (A), 8 (B) and 8 (C), the following two
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conditions a. b. The arrangement of the slits 74 and 75 in the sound collecting surface 87 is
determined so as to satisfy the following (refer to Non-Patent Document 1 for details). Condition
a. There are slits 74 and 75 respectively on the inside and the outside of one node that is
produced when the diaphragm 76 is vibrating in the first mode, and the distances from the node
to the slits 74 and 75 are approximately equal. Condition b. The two nodes and the two slits 74
and 75, which are produced when the diaphragm 76 vibrates in the second mode, respectively
overlap.
[0010]
However, although this measure can prevent the occurrence of a large peak in the reproduction
frequency characteristic of the horn speaker 8, there is a problem that the occurrence of a dip
can not be prevented. The reason is as described below. In the first order mode, the vibration
node of the diaphragm 76 is located in the middle of the inner slit 74 and the outer slit 75.
Therefore, when the diaphragm 76 vibrates in the first mode, the sound pressure of the sound
generated at the entrance of the slit 74 and the sound pressure of the sound generated at the
entrance of the slit 75 are in opposite phase. Therefore, the sound pressure of the sound
propagated through the slits 74 and 75 is canceled at the junction of the slits 74 and 75.
Therefore, in the reproduction frequency characteristic of the horn speaker 8, a dip occurs at the
frequency of the primary mode. Further, when the diaphragm 76 vibrates in the second mode,
the nodes of the vibration of the diaphragm 76 are located at the inner slit 74 and the outer slit
75, respectively. Therefore, the sound pressure of the sound generated at the entrance of the slit
74 and the sound pressure of the sound generated at the entrance of the slit 75 are both
substantially zero. Therefore, in the reproduction frequency characteristic of the horn speaker 8,
a dip occurs at the frequency of the secondary mode.
[0011]
Patent Document 1 discloses a technique that is a countermeasure against the occurrence of dip
in each vibration mode described above. As shown in FIG. 9, in the horn speaker 8A disclosed in
Patent Document 1, the gap between the outer peripheral wall 81 of the phase plug 70 and the
inner peripheral wall 82 of the pole piece 80 is extended to the throat portion 78 of the horn 77.
The auxiliary slit 90 is formed by this. In this configuration, the space in the outer peripheral
portion of the space OS sandwiched between the diaphragm 76 and the phase plug 70 is
connected to the space in the horn 77 which is the space in front of the phase plug 70 by the
auxiliary slit 90. Is closed. This makes it difficult for the resonance phenomenon to occur.
Therefore, it is not necessary to take design measures as disclosed in Non-Patent Document 1.
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[0012]
Bob H. Smith, An Investigation of the Air Chamber of Horn Type Loudspeakers, THE JOURNAL
OF THE ACOUSTICAL SOCIETY OF AMERICA, USA, March 1953, P. 305-P. 312, U.S. Pat. No.
5,117,462.
[0013]
However, the technology disclosed in Patent Document 1 has the following problems.
First, in the technique of Patent Document 1, the shape of the auxiliary slit 90 must be such that
the phase of the sound wave transmitted in the slit 90 and the phase of the sound wave
transmitted in the other slits 74 and 75 are aligned. . For this reason, the shapes of the auxiliary
slit 90 and the phase plug 70 become complicated. Second, in the technique of Patent Document
1, the end opposite to the side communicating with the auxiliary slit 90 in the space between the
edge 86 and the pole piece 80 is closed by the spacer ring 84. Therefore, a resonance
phenomenon occurs in the space surrounded by the spacer ring 84, the edge 86 and the pole
piece 80. Thirdly, in the technique of Patent Document 1, even the sound waves generated by the
edge 86 moving in a different direction from the diaphragm 76 at the outer peripheral portion of
the diaphragm 76 are transmitted inside the auxiliary slit 90 and radiated from the horn 77 to
the external space. Be done. For this reason, the sound quality is worse than that in the case
where only the sound waves transmitted in the slits 74 and 75 are radiated from the horn 77 to
the external space. The present invention has been made under such background, and it is an
object of the present invention to flatten the reproduction frequency characteristics of a horn
speaker.
[0014]
The present invention relates to a horn speaker having a horn for radiating a sound wave into a
space, a dome-shaped diaphragm, and a phase plug for introducing a sound emitted from the
diaphragm to a throat portion of the horn. A voice coil bobbin fixed to the frame, an edge
supporting the edge or the voice coil bobbin, and a magnetic gap which vibratably supports the
diaphragm and the voice coil bobbin via the edge and holds the voice coil bobbin inside And a
holder having a magnetic circuit, wherein the holder has an air flow passage communicating the
magnetic gap with a space outside the holder.
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[0015]
In the present invention, the space between the diaphragm and the phase plug and the space
having an infinite spread outside the holding body communicate with each other through the air
flow passage.
Therefore, according to the present invention, the resonance phenomenon is less likely to occur
compared to the case where the space between the diaphragm and the phase plug is closed.
Therefore, the reproduction frequency characteristic of the horn speaker can be made flat.
Further, in the present invention, the outlet of the air flow passage is directed to the outside of
the holder. Therefore, it is possible to avoid a situation in which even the sound wave generated
by the vibration of the edge is emitted from the horn and the sound quality is deteriorated.
[0016]
In the present invention, the holding body is an air flow passage connecting the magnetic gap to
a space outside the holding body, and the air flow passage is formed so as not to intersect the
magnetic flux circulating around the magnetic circuit. It may have an air flow passage. According
to such a configuration, it is possible to avoid the occurrence of a situation where the driving
force applied from the magnetic circuit to the voice coil bobbin is weakened in exchange for the
flattening of the reproduction frequency characteristic of the horn speaker.
[0017]
It is a longitudinal cross-sectional view of the horn speaker which is one embodiment of the
present invention. It is an enlarged view of the remaining part except the part of the horn in the
horn speaker. It is the figure which looked at the same horn speaker from the back side of a
diaphragm. It is an enlarged view of the horn speaker which is other embodiment of this
invention. It is an enlarged view of the horn speaker which is other embodiment of this invention.
It is an enlarged view of the horn speaker which is other embodiment of this invention. It is a
longitudinal cross-sectional view of the conventional horn speaker. It is a figure which shows the
relationship between the vibration mode in the conventional horn speaker, and the position of
the slit of a phase plug. It is a longitudinal cross-sectional view of the conventional horn speaker.
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[0018]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 is a longitudinal sectional view of a horn speaker 5 according to an embodiment
of the present invention. FIG. 2 is an enlarged view of the remaining part of the horn 14 in FIG. 1
excluding a part. In FIG. 1 and FIG. 2, the outer shape of the pole piece 10 has a shape in which a
small diameter cylinder and a large diameter cylinder are connected. A sound guide hole 11 is
bored at the center of the pole piece 10. The throat portion 55 of the horn 14 is connected to the
opening 13 of the sound introducing hole 11 at one end face of the pole piece 10, and the pole
piece 10 and the horn 14 are integrated to form the horn of the horn speaker 5 of the present
invention. Are configured. A phase plug 16 is fixed to the other end face of the pole piece 10.
Behind the phase plug 16 is a dome-shaped diaphragm 17 which is a curved surface. The
diaphragm 17 is supported such that a concave surface (hereinafter, the concave surface is
referred to as a radiation surface 49) recessed with respect to the radiation direction of sound in
the diaphragm 17 faces the phase plug 16. The details of the configuration for supporting the
diaphragm 17 will be described later.
[0019]
The phase plug 16 is a member that serves as a phase equalizer that aligns the phases of sound
waves generated by the vibration of the diaphragm 17. The phase plug 16 has a structure in
which the conical member 18 and the annular member 19 surrounding the outer periphery
thereof, and the annular member 19 and the annular member 20 surrounding the outer
periphery thereof are partially connected with the slits 21 and 22 interposed therebetween. It
has become. The surfaces of the members 18, 19 and 20 connected as the phase plug 16 facing
the diaphragm 17 are convex curved surfaces corresponding to the shape of the radiation
surface 49 of the diaphragm 17 (hereinafter, this convex curved surface is referred to as the
sound collecting surface 45) I am The gap between the conical member 18 and the annular
member 19 and the gap between the annular member 19 and the annular member 20 constitute
slits 21, 22 extending from the sound collecting surface 45 toward the sound introducing hole
11. The cross-sectional shape of each of the slits 21 and 22 has a tapered shape that expands
toward the acoustic hole 11. In FIG. 2, a part of the slits 21 and 22 is closed halfway to the sound
collecting surface 45, but this is because the conical member 18 and the annular member 19 are
located at the closed portions in the cross section of FIG. 2. And showing that the annular
member 19 and the annular member 20 are connected.
[0020]
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A cylindrical voice coil bobbin 39 is fixed to the outer peripheral portion of the diaphragm 17. An
edge 40 surrounding and supporting the voice coil bobbin 39 is provided at a position slightly
closer to the horn 14 near the connection portion between the voice coil bobbin 39 and the
peripheral end of the diaphragm 17.
[0021]
A back plate 31, an annular magnet 32, a top plate 33 and a spacer ring 34 are provided around
the pole piece 10, the phase plug 16 and the diaphragm 17. The back plate 31, the annular
magnet 32, the top plate 33, the spacer ring 34, and the pole piece 10 serve as a holder having a
magnetic circuit including a magnetic gap AG1 for holding the voice coil bobbin 39 therein.
Further, among the five members forming the holding body, the spacer ring 34 plays a role of
supporting the diaphragm 17 and the voice coil bobbin 39 in a vibrating manner via the edge 40.
[0022]
More specifically, the back plate 31, the annular magnet 32, and the top plate 33 have an
annular shape with different inner diameters. The spacer ring 34 has a shape in which a small
diameter cylinder and a large diameter cylinder are connected. On the inner side of the outer
periphery of each of the back plate 31, the annular magnet 32, the top plate 33, and the spacer
ring 34, four screw holes penetrating between one end face and the other end face are provided
at equal intervals. It is done.
[0023]
The back plate 31 is fixed to the pole piece 10 in a state of surrounding the pole piece 10. As
shown in FIGS. 2 and 3, the back plate 31, the annular magnet 32, the top plate 33, and the
spacer ring 34 form four cylindrical spacers 52-1 and 52 between the top plate 33 and the
spacer ring 34. -2 and 52-3 and 52-4, and are screwed to the respective screw holes and
cylindrical spacers 52-1, 52-2, 52-3 and 52-4 from the spacer ring 34 side. They are integrated
by screwing 1, 50-2, 50-3, 50-4.
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[0024]
When the back plate 31, the annular magnet 32, the top plate 33, and the spacer ring 34 are
integrated, the inner peripheral wall 35 of the annular magnet 32 and the outer peripheral wall
37 of the pole piece 10 face each other with a gap therebetween. The inner circumferential wall
36 and the outer circumferential wall 37 of the pole piece 10 face each other with a magnetic
gap AG1 which is a narrower gap therebetween. One end face of the annular magnet 32 is fixed
to the end face of the back plate 31 opposite to the horn 14, and one end face of the top plate 33
is fixed to the other end face of the annular magnet 32. One end face of the spacer ring 34 is
fixed to the other end face of the top plate 33 with the air gap XS of the width of the cylindrical
spacers 52-1, 52-2, 52-3 and 52-4 interposed therebetween. A sound absorbing material 53 is
packed in the air gap XS between the plate 33 and the spacer ring 34. The air gap XS constitutes
an air flow passage that causes the magnetic gap AG1 to communicate with the space outside the
outer peripheral wall 95 of the spacer ring 34.
[0025]
The back plate 31, the top plate 33, and the pole piece 10 are formed of a material of high
magnetic permeability. The annular magnet 32 has an N pole on one end face (for example, an
end face on the back plate 31 side) and an S pole on the other end face (for example, an end face
on the top plate 33 side). Then, the back plate 31, the top plate 33, and the pole piece 10
constitute a magnetic circuit in which the magnetic lines of force generated by the annular
magnet 32 make one round. A magnetic flux circulating around this magnetic circuit crosses the
magnetic gap AG1.
[0026]
The outer peripheral portion of an edge 40 surrounding the diaphragm 17 and the voice coil
bobbin 39 is fixed to the inner peripheral surface 41 of the spacer ring 34. In a state where the
outer peripheral portion of the edge 40 is fixed to the spacer ring 34, the sound wave emitting
surface 49 (concave surface) of the diaphragm 17 and the sound collecting surface 45 (convex
surface) of the phase plug 16 oppose each other with a gap. Further, a tip portion of the voice
coil bobbin 39 around which a voice coil (not shown) is wound is accommodated in the magnetic
gap AG1.
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[0027]
The configuration of the horn speaker 5 is as described above. The horn speaker 5 operates as
follows. When a current of an audio signal is supplied to a voice coil (not shown) wound around a
voice coil bobbin 39 of the diaphragm 17, this current intersects the magnetic flux in the
magnetic gap AG1. Therefore, in the voice coil bobbin 39, the direction orthogonal to both the
direction of the current flowing through the voice coil (not shown) and the direction of the
magnetic flux in the magnetic gap AG1 (more specifically, along the central axis bx of the pole
piece 10 The driving force in the parallel direction is applied, and the diaphragm 17 fixed to the
voice coil bobbin 39 vibrates. When the diaphragm 17 vibrates, air in the space OS1 between the
diaphragm 17 and the phase plug 16 is pushed or pulled back to the sound introducing hole 11
through the slits 21 and 22 of the phase plug 16 due to the vibration. . Then, the compressional
waves of the air pushed and pulled back are emitted as sound waves from the horn 14 to the
external space via the sound guide holes 11.
[0028]
In the embodiment described above, the side of the air gap XS opposite to the side
communicating with the magnetic gap AG1 is open to the outer space outside the spacer ring 34.
By this opening, the space OS1 communicates with the external space via the magnetic gap AG1,
the space AS1 (FIG. 2) sandwiched by the edge 40 on the outside of the voice coil bobbin 39 and
the top plate 33, and the air gap XS. Since the external space is a space having an infinite extent,
the reactance component of the acoustic impedance Z is approximately zero. Therefore, the
reactance component of the acoustic impedance Z of the space OS1 approaches 0 when the
space OS1 is in communication with the external space. Therefore, in the present embodiment,
the resonance phenomenon caused by the reactance component of the acoustic impedance Z of
the space OS1 is less likely to occur as compared with the case where the space OS1 is not
communicated with the external space. Therefore, the reproduction frequency characteristic of
the horn speaker 5 can be made flat.
[0029]
Further, in the horn speaker 5 of the present embodiment, since the opening on the inner
circumferential wall 41 side in the air gap XS is in the vicinity of the edge 40, the sound wave
generated by the vibration of the edge 40 leaks to the outside through the air gap XS. However,
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the opening on the outer peripheral wall 95 side of the air gap XS is directed in the direction
orthogonal to the sound output direction (the direction orthogonal to the central axis bx of the
pole piece 10). Therefore, it is possible to avoid the situation that even the sound wave generated
by the vibration of the edge 40 is emitted from the horn 14 and the sound quality is deteriorated.
[0030]
Further, in the present embodiment, the air gap XS, which is an air flow passage, is formed so as
not to intersect the magnetic flux circulating around the magnetic circuit. Therefore, it is possible
to avoid the occurrence of a situation where the driving force given from the magnetic circuit to
the voice coil bobbin 39 is weakened in exchange for the flattening of the reproduction
frequency characteristic of the horn speaker 5.
[0031]
As mentioned above, although one embodiment of this invention was described, there may be
other embodiments in this invention. For example, it is as follows. (1) In the above embodiment,
the edge 40 may support not the voice coil bobbin 39 extending from the outer peripheral
portion of the diaphragm 17 but the outer peripheral portion itself of the diaphragm 17 from the
outside. (2) In the above embodiment, the air gap XS between the spacer ring 34 and the top
plate 33 extends along a plane orthogonal to the central axis bx of the pole piece 10. However,
the air gap XS between the spacer ring 34 and the top plate 33 may be formed in a direction
different from the direction of this plane.
[0032]
(3) In the above embodiment, the cylindrical spacers 52-1, 52-2, 52-3 and 52-4 are held between
the end faces of the spacer ring 34 and the top plate 33, and the air flow passage is between
them. An air gap XS was provided. However, instead of providing the air gap XS between the
spacer ring 34 and the top plate 33, the spacer ring 34 itself may be provided with a hole XS
'which serves as an air flow passage. For example, as in the horn speaker 5A shown in FIG. 4, a
plurality of holes XS 'from the area between the edge 40 of the inner peripheral wall 41 of the
spacer ring 34 and the top plate 33 to the outer peripheral wall 95 are provided radially. It is
also good. In this case, each hole XS 'in the spacer ring 34 avoids a direction intersecting with the
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screws 50-1, 50-2, 50-3, 50-4 screwed from the other end face side of the spacer ring 34. You
should drill it.
[0033]
(4) In the above embodiment, the air gap XS, which is an air flow passage, is provided in a
direction perpendicular to the central axis bx of the pole piece 10 from the space AS1
sandwiched between the edge 40 and the top plate 33 outside the voice coil bobbin 39 It was
being done. However, the direction in which the air gap XS is provided does not have to be
orthogonal to the central axis bx. For example, as in the horn speaker 5B shown in FIG. 5, an air
gap XS ′ ′ extending from the magnetic gap AG1 in a direction parallel to the central axis bx of
the pole piece 10 may be provided instead of the air gap XS. In the horn speaker 5 </ b> B, an
annular cavity having a diameter substantially the same as the diameter of the voice coil bobbin
39 is bored between both end surfaces of the back plate 31. The width of this annular cavity is
the same as the width between the inner circumferential wall 35 of the annular magnet 32 and
the outer circumferential wall 37 of the pole piece 10. Further, an annular cavity having a
diameter substantially the same as the diameter of the voice coil bobbin 39 is also bored between
both end surfaces of the proximal end of the horn 14 connected to the back plate 31. The width
of this annular cavity is also the same as the width between the inner circumferential wall 35 of
the annular magnet 32 and the outer circumferential wall 37 of the pole piece 10. A void XS ′
′ is formed by the cavity of the back plate 31 and the cavity at the proximal end of the horn 14.
In the horn speaker 5B, the side of the air gap XS ′ ′ opposite to the side communicating with
the magnetic gap AG1 is open to the outer space outside the base end of the horn. By this
opening, the space OS1 communicates with the external space via the magnetic gap AG1 and the
air gap XS ′ ′. Therefore, the same effect as that of the above embodiment can be obtained.
[0034]
(6) In the above embodiment, as shown in FIG. 6, the end portion of the inner peripheral wall 41
and the outer peripheral wall 95 of the spacer ring 34 on the side facing the top plate 33 is
rounded and the outer peripheral wall 96 of the top plate 33 is By rounding the end on the side
facing the spacer ring 34, the width of the opening of the air gap XS between the spacer ring 34
and the top plate 33 may be expanded. According to this embodiment, the change in acoustic
impedance between the space AS1 and the air gap XS sandwiched between the top plate 33 and
the edge 40 interposed on the way from the magnetic gap AG1 to the air gap XS, and the space
XS and the spacer ring 34 The change in acoustic impedance between the outer space 95 and the
external space is gradual. Therefore, the reflected wave in which the sound wave directed from
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the air gap XS to the external space on the outer peripheral wall 95 side is returned to the air
gap XS side and the reflected wave from the space AS1 to the air gap XS are reduced to more
reliably prevent the occurrence of the resonance phenomenon. Can. Similarly, the size of the
opening at one or both ends of the hole XS 'provided in the spacer ring 34 in the embodiment of
(2) may be expanded to achieve acoustic impedance matching.
[0035]
(7) In the above embodiment, the gap XS communicating with the magnetic gap AG1 is formed
between the spacer ring 34 and the top plate 33, and the sound absorbing material 53 is packed
in the gap XS. However, the spacer ring 34 side in the space between the top plate 33 and the
edge 40 may be closed without providing the gap XS. In this case, the sound absorbing material
may be filled in the space surrounded by the spacer ring 34 as the holding body, the top plate
33, and the edge 40 and in communication with the magnetic gap AG1. Conceptually showing
the configuration of this embodiment, “a horn having a horn for radiating a sound wave into
space, a dome-shaped diaphragm, and a phase plug for introducing a sound emitted from the
diaphragm to the throat portion of the horn In a speaker, a voice coil bobbin fixed to an outer
peripheral portion of the diaphragm, an edge supporting the diaphragm or voice coil bobbin, and
the diaphragm and the voice coil bobbin vibratably supported via the edge, the voice And a
holding body having a magnetic circuit including a magnetic gap for holding the coil bobbin
inside, wherein a space surrounded by the holding body and the edge and in communication with
the magnetic gap is filled with a sound absorbing material. Horn speaker. 」となる。
[0036]
DESCRIPTION OF SYMBOLS 5 ... Horn speaker, 10 ... Pole piece, 11 ... Sound conduction hole, 14
... Horn, 16 ... Phase plug, 17 ... Diaphragm, 18 ... Conical member, 19, 20 ... Annular member, 31
... Back plate, 32 ... Annular magnet, 33: top plate, 34: spacer ring, 39: voice coil bobbin, 40: edge,
52: cylindrical spacer, 53: sound absorbing material
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