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JP2016082369

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DESCRIPTION JP2016082369
Abstract: To provide a horn speaker that finely and inexpensively controls a peak dip of sound of
a specific frequency. A horn speaker (1) has a diaphragm (87), a back cover (95) covering the
diaphragm (87), a horn (84) emitting a sound generated by the vibration of the diaphragm (87),
and a sound generated by the vibration of the diaphragm (87) And a sound guiding portion 10
for communicating the space BC surrounded by the back cover 95 and the diaphragm 87 with
the space surrounded by the horn 84. [Selected figure] Figure 1
ホーンスピーカ
[0001]
The present invention relates to a horn speaker.
[0002]
FIG. 7 is a longitudinal sectional view of the conventional horn speaker 8.
In FIG. 7, the throat portion 94 of the horn 84 is fixed to one end surface of the back plate 80. In
the back plate 80, one bottom surface of the pole piece 85 is fixed to the end surface opposite to
the horn 84. A sound guide hole 83 is formed in the center of the back plate 80 and the pole
piece 85 so as to penetrate both and reach the throat portion 94 of the horn 84. 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 having a plurality of slits is fitted in the bowl
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shaped surface. A diaphragm 87 is supported behind the phase plug 86. The diaphragm 87 is
curved in a dome shape, and a cylindrical voice coil bobbin 88 is provided on the outer
peripheral portion thereof.
[0003]
Further, on the end surface 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 held between the back plate 80 and the top plate 81. 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 wall of the top plate 81 faces the outer peripheral wall 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 wall of
the top plate 81 and the outer peripheral wall of the pole piece 85.
[0005]
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 wall of the spacer ring 90 and the outer peripheral
portion of the diaphragm 87. Spacer ring 90 supports the perimeter of edge 89. The edge 89
supports the outer periphery of the diaphragm 87. That is, the edge 89 surrounds and supports
the diaphragm 87 from the outside, and the spacer ring 90 surrounds and supports the edge 89
from the outside.
[0006]
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In the horn speaker 8 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. When current flows in the voice coil in the voice coil bobbin 88, a driving force in a
direction parallel to the central axis ax of the pole piece 85 is applied to the voice coil bobbin 88,
and the diaphragm 87 fixed to the voice coil bobbin 88 vibrates. . That is, the diaphragm 87
functions as a diaphragm, and the spacer ring 90 functions as a diaphragm holding member that
supports the diaphragm 87 via the edge 89. When the diaphragm 87 vibrates, 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 of the phase plug 86 by the vibration. Then, the
compressional waves of the pushed and pulled back air are emitted as sound waves from the
sound emitting hole 96 surrounded by the horn 84 via the sound introducing hole 83.
[0007]
In FIG. 7, both end surfaces of the back cover 95 are fixed to the end surface of the spacer ring
90 opposite to the top plate 81. In the conventional horn speaker 8, in the back cavity BC which
is a space surrounded by the diaphragm 87, the edge 89, the spacer ring 90, and the back cover
95, a standing wave is generated by the vibration of the diaphragm 87 and There was distortion
in the sound being emitted. The distortion of sound means that a dip or peak appears in the
frequency characteristic of the horn speaker 8 which should ideally be flat. In particular, a horn
speaker for high-frequency band is required to be able to reproduce sound at a very high
frequency (for example, a frequency near 20 kHz, which is the upper limit of the audible band).
The effect of strain is significant. Various techniques for controlling such sound distortion and
improving sound quality have been proposed. For example, Patent Document 1 discloses a
technique for removing sound distortion by signal processing. Patent Document 2 discloses a
technique for providing a sound absorbing material on the back cover 95.
[0008]
JP-A-8-317490 JP-A-3-070395
[0009]
As disclosed in Patent Document 1, the technology for removing the distortion of sound by signal
processing must separately provide a signal processing device, and the burden on the user is
large in terms of cost and setting of the signal processing device. And there is a problem.
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[0010]
In the technology of providing a sound absorbing material in the back cover 95 as disclosed in
Patent Document 2, the sound absorbing material absorbs not only the sound of the resonance
frequency that causes the standing wave but also the sound of frequencies other than the
resonance frequency. Therefore, there is a problem that the sound of a wide band frequency is
affected.
Furthermore, there is a problem that the cost becomes high because a separate component called
a sound absorbing material is provided.
[0011]
The present invention has been made in view of the problems described above, and it is an object
of the present invention to provide a technique that enables sound distortion to be finely and
inexpensively controlled in a horn speaker.
[0012]
In order to solve the above problems, the present invention guides a diaphragm, a back cover
that covers the diaphragm, a horn that emits a sound generated by the vibration of the
diaphragm, and a sound generated by the vibration of the diaphragm to the horn A horn speaker
comprising: a phase plug, a space surrounded by the back cover and the diaphragm, and a sound
guiding portion for communicating the space surrounded by the horn.
[0013]
In the horn speaker of the present invention, the space enclosed by the back cover and the
diaphragm is in communication with the space enclosed by the horn through the sound guiding
portion, and the diaphragm is vibrated to generate the former space. The sound is guided to the
latter space.
According to the horn speaker of the present invention, it is possible to eliminate the distortion
of the sound by superimposing the sound emitted from the horn without passing through the
sound guide and the sound guided by the sound guide.
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[0014]
For example, a path between a first path through which sound travels from the diaphragm to the
horn via the phase plug, and a path along which a second path travels through sound from the
diaphragm to the horn through the sound guide unit If the difference is an odd multiple of the
half wavelength of the sound to be controlled, the sound to be controlled is a sound that is a dip
in the frequency characteristics of the horn speaker when it is assumed that the sound
introducing portion is not present.
Further, when the path difference is an even multiple of the half wavelength of the sound to be
controlled, the sound to be controlled is a sound having a peak in the frequency characteristic.
[0015]
In a more preferable aspect, a plurality of the sound guiding portions are provided.
According to this aspect, when there are a plurality of sounds to be controlled, it is possible to
eliminate a plurality of dips or peaks by adjusting the length of each sound guide according to
the wavelength of the sound to be controlled.
[0016]
In a more preferable aspect, the sound guide unit is detachable. According to this aspect, since
the sound guiding unit is detachable, the user of the horn speaker can adjust the length of the
sound guiding unit and control the sound emitted by the horn speaker.
[0017]
In a more preferable aspect, a part of the wall surface of the main body of the horn speaker is a
part of the wall surface of the sound introducing portion. According to this aspect, even if the
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horn speaker is provided with the sound guiding portion, the horn speaker is compact.
[0018]
It is a longitudinal cross-sectional view of the horn speaker 1 which is 1st Embodiment of this
invention. It is a longitudinal cross-sectional view of the horn speaker 2 which is 2nd
Embodiment of this invention. It is a longitudinal cross-sectional view of the horn speaker 3
which is 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the horn
speaker 4 which is 4th Embodiment of this invention. It is a perspective view for demonstrating a
modification (5). It is a perspective view for demonstrating a modification (7). It is a longitudinal
cross-sectional view of the conventional horn speaker 8. FIG.
[0019]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. First Embodiment FIG. 1 is a longitudinal sectional view of a horn speaker 1 according
to a first embodiment of the present invention. In FIG. 1, the same components as those in FIG. 7
are denoted by the same reference numerals. As apparent from the comparison between FIG. 1
and FIG. 7, the horn speaker 1 and the horn speaker 8 are different in that the back cavity BC
and the sound emission hole 96 (that is, the space surrounded by the horn 84) are different. And
the sound guiding portion 10 for communicating the same. The following description will be
made focusing on the sound introducing unit 10.
[0020]
The sound guiding portion 10 is a tube having a square cross section. As shown in FIG. 1, the
sound guiding unit 10 causes the back cavity BC to communicate with the sound release hole 96.
The sound guiding unit 10 guides the sound generated in the back cavity BC by the vibration of
the diaphragm 87 to the sound emission hole 96. In FIG. 1, one sound introducing unit 10 is
provided at two positions symmetrical with respect to the center axis ax of the pole piece 85, and
the lengths of the respective sound introducing units 10 are the same.
[0021]
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The length of the sound guiding portion 10 is the wavelength of the sound to be controlled (that
is, the sound of the frequency of dip or peak in the frequency characteristic of the horn speaker
1 without the sound guiding portion 10) and the control content thereof Thus, the adjustment is
performed at the design stage or the production stage of the horn speaker 1. For this reason,
after shipment from the factory, the user of the horn speaker 1 can not adjust the length of the
sound introducing portion 10. The specific content of adjustment of the length of the sound
introducing portion 10 is as follows. As shown in FIG. 1, the path of the sound generated in the
space OS by the vibration of the diaphragm 87 and guided to the sound emission hole 96
through the phase plug 86 is a path A, and the vibration of the diaphragm 87 causes the back
cavity BC. A path of sound that is generated and guided to the sound output hole 96 via the
sound introducing unit 10 is set as a path B. When a sound that is a dip in the above frequency
characteristic is to be controlled, the sound conduction is performed so that the difference
between the lengths of path A and path B (hereinafter, path difference) becomes an odd multiple
of the half wavelength of the sound. The length of the part 10 is adjusted. On the other hand,
when a sound having a peak in the above frequency characteristic is to be controlled, the length
of the sound guiding portion 10 is set so that the path difference between the path A and the
path B is an even multiple of the half wavelength of the sound. Adjusted. The reason for making
such adjustments is as follows.
[0022]
When the diaphragm 87 is pushed toward the sound introducing hole 83, the air is compressed
in the space OS and the density of the air increases, whereas the density of the air decreases in
the back cavity BC. Conversely, when the diaphragm 87 is pulled back from the direction of the
sound introducing hole 83, the density of air decreases in the space OS, and the density of air
increases in the back cavity BC. As described above, the sound generated in the space OS and the
sound generated in the back cavity BC are in opposite phase to each other at the generation time
of each sound. Since the phases are opposite to each other, if the path difference between the
path A and the path B is an odd multiple of the half wavelength of the generated sound, they
strengthen each other and the dip is eliminated. Conversely, if the above-mentioned path
difference is an even multiple of the half wavelength of the generated sound, they weaken each
other, and the peak is suppressed. For this reason, in the present embodiment, the length of the
sound introducing portion 10 is adjusted as described above.
[0023]
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In the horn speaker 1, it is possible to generate Helmholtz resonance in which the sound guiding
portion 10 is a neck and the back cavity BC is a cavity. The distortion of sound can also be
eliminated by utilizing the Helmholtz resonance. For example, when a sound that is a dip in the
above frequency characteristics is to be controlled, and Helmholtz resonance is used to eliminate
the dip, the Helmholtz resonance frequency and the dip in the design stage or manufacturing
stage of the horn speaker 1 The cross-sectional area and the length of the sound guiding portion
10 or the volume of the back cavity BC may be adjusted so that the frequencies to be equal
become equal. Further, the adjustment by the Helmholtz resonance and the tube resonance
described above (the length of the sound introducing portion 10 is set so that the difference
between the route A and the route B becomes an odd or even multiple of the half wavelength of
the sound to be controlled It is possible to eliminate the dip efficiently if used in combination
with the adjustment). In addition, if the Helmholtz resonance frequency and the resonance
frequency of the tube resonance are different, two types of sounds corresponding to both can be
adjusted. The fact that the user can not adjust the Helmholtz resonance frequency after the
factory shipment of the horn speaker 8 is similar to the fact that the resonance frequency of the
tube resonance can not be adjusted after the factory shipment.
[0024]
In the case of the horn speaker 1 according to the present embodiment, no signal processing
device is used to eliminate the distortion of the sound. Therefore, compared with the technique
disclosed in Patent Document 1, the horn speaker 1 is inexpensive and does not burden the user.
Sound distortion can be eliminated. In addition, by utilizing tube resonance or Helmholtz
resonance (or combining both), only sound of a specific frequency can be controlled, and the
frequency can be controlled more finely than the technology disclosed in Patent Document 2. can
do. Furthermore, in the horn speaker 1, since the sound control is performed using the sound
guide unit 10 instead of the sound absorbing material, the sound can be controlled at low cost.
[0025]
Second Embodiment FIG. 2 is a longitudinal sectional view of a horn speaker 2 according to a
second embodiment of the present invention. In FIG. 2, the same components as those in FIG. 1
are denoted by the same reference numerals. As apparent from comparison between FIG. 2 and
FIG. 1, the sound guiding unit 20 A and the sound guiding unit 20 B of the horn speaker 2
correspond to the sound guiding unit 10 of the horn speaker 1. The following description will
focus on the sound introducing unit 20A and the sound introducing unit 20B.
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[0026]
The cross sections of the sound guiding portion 20A and the sound guiding portion 20B are
square, and the cross sectional areas of the respective portions are equal, but the lengths thereof
are different. Further, the lengths of the sound introducing portions 20A provided at two
symmetrical positions with respect to the center axis ax of the pole piece 85 are the same. The
same applies to the length of the sound introducing portion 20B. The lengths of the sound
introducing unit 20A and the sound introducing unit 20B are adjusted at the design stage and
the manufacturing stage of the horn speaker 2 according to the wavelengths of the two types of
sounds to be controlled and the control contents thereof. The specific content of the adjustment
is the same as that of the first embodiment. For example, when the sound which is a dip in the
frequency characteristic of the horn speaker 2 when there is neither the sound guiding unit 20A
nor the sound guiding unit 20B is a control target by the sound guiding unit 20A, the vibration of
the diaphragm 87 The sound path A generated in the space OS and guided to the sound emission
hole 96 via the phase plug 86 and the vibration of the diaphragm 87 by the vibration of the
diaphragm 87 are generated in the sound emission hole 96 via the sound guiding portion 20A.
The length of the sound introducing portion 20A may be determined so that the path difference
of the path B of the sound to be guided is an odd multiple of the half wavelength of the sound.
Similarly, when the control target by the sound guiding unit 20A is a sound having a peak in the
frequency characteristic, the length of the sound guiding unit 20A is set so that the path
difference becomes an even multiple of the half wavelength of the sound. If you decide The same
applies to the sound guiding unit 20B. Also in the present embodiment, the lengths of the sound
introducing unit 20A and the sound introducing unit 20B are adjusted at the time of shipment
from the factory, and can not be changed by the user after shipment from the factory.
[0027]
Similarly to the first embodiment, in the horn speaker 2 as well, it is possible to eliminate sound
distortion by utilizing Helmholtz resonance in which the sound guiding unit 20A or the sound
guiding unit 20B is a neck and the back cavity BC is a cavity. Adjust the cross-sectional area of
each sound conduction part so that the frequency of Helmholtz resonance generated by necking
sound guiding part 20A and the frequency of Helmholtz resonance generated by necking sound
guiding part 20B are equal. Alternatively, the cross-sectional areas of the respective sound
introducing portions may be adjusted so that the two are different. When the two are equal, the
cross-sectional area or the volume of the back cavity BC may be adjusted so that the Helmholtz
resonance frequency becomes equal to any one of the tube resonance frequencies. Similarly, in
the case where the Helmholtz resonance frequency whose neck is the sound guiding portion 20A
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and the Helmholtz resonance frequency whose neck is the sound guiding portion 20B are
different, one of them is equal to one of the resonance frequencies of the tube resonances. The
cross sectional area or the volume of the back cavity BC may be adjusted.
[0028]
Even with the horn speaker 2 of the present embodiment, as in the first embodiment, distortion
of the sound of the horn speaker 2 is eliminated at low cost and without burdening the user as
compared with the technique disclosed in Patent Document 1. Can. Moreover, compared with the
technique disclosed by patent document 2, frequency can be controlled finely and sound can be
controlled inexpensively. Furthermore, in the case of the horn speaker 2 as in the present
embodiment, the variation of the adjustment can be expanded as compared with the first
embodiment.
[0029]
Third Embodiment FIG. 3 is a longitudinal sectional view of a horn speaker 3 according to a third
embodiment of the present invention. In FIG. 3, the same components as those in FIG. 1 are
denoted by the same reference numerals. As apparent from comparison between FIG. 3 and FIG.
1, the sound guiding unit 30A, the sound guiding unit 30B, the sound guiding unit 30C, and the
pins 300 of the horn speaker 3 correspond to the sound guiding unit 10 of the horn speaker 1.
The following description will focus on the sound guiding unit 30A, the sound guiding unit 30B,
the sound guiding unit 30C, and the pin 300.
[0030]
The sound guiding portion 30B is fixed to the horn 84, and the sound guiding portion 30C is
fixed to the back cover 95. Therefore, after the factory shipment of the horn speaker 3, the user
of the horn speaker 3 can not change the sound guiding unit 30B and the sound guiding unit
30C, for example. On the other hand, the sound guiding unit 30A is detachably attached to the
sound guiding unit 30B and the sound guiding unit 30C by the pin 300. The sound guiding unit
30A is fixed to the sound guiding unit 30B and the sound guiding unit 30C by the pin 300, and is
the same as the sound guiding unit 10 of the first embodiment and the sound guiding unit 20A
and the sound guiding unit 20B of the second embodiment. Play a role.
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[0031]
In the present embodiment, various lengths are prepared as the sound guiding unit 30A, and the
user may replace the sound guiding unit 30A attached to the horn speaker 3 according to the
wavelength of the sound to be controlled and the control content thereof. it can. In the present
embodiment, the lengths of the sound introducing portions 30A provided at two positions
symmetrical with respect to the center axis ax of the pole piece 85 are the same.
[0032]
Similarly to the first embodiment and the second embodiment, in the horn speaker 3 as well,
using the Helmholtz resonance in which the sound guiding unit 30A, the sound guiding unit 30B
and the sound guiding unit 30C are a neck and the back cavity BC is a cavity , Can eliminate the
distortion of the sound. In the present embodiment, it is possible to adjust the occurrence of
Helmholtz resonance, for example, by the user replacing the sound introducing unit 30A after the
factory shipment of the horn speaker 3. This point is the first embodiment or the second
embodiment. It is different from the form.
[0033]
In the case of the horn speaker 3 as in the present embodiment, as in the first embodiment and
the second embodiment, the horn speaker 3 is inexpensive and does not burden the user as
compared with the technique disclosed in Patent Document 1. The distortion of the sound of can
be eliminated. Moreover, compared with the technique disclosed by patent document 2,
frequency can be controlled finely and sound can be controlled inexpensively. Furthermore, in
the case of the horn speaker 3 as in the present embodiment, unlike the first embodiment and
the second embodiment, the user changes the sound introducing unit 30A even after shipment of
the horn speaker 3 from the factory. Sound distortion can be adjusted.
[0034]
Fourth Embodiment FIG. 4 is a longitudinal sectional view of a horn speaker 4 according to a
fourth embodiment of the present invention. In FIG. 4, the same components as those in FIG. 1
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are denoted by the same reference numerals. As apparent from the comparison between FIG. 4
and FIG. 1, the sound guiding unit 40 of the horn speaker 4 corresponds to the sound guiding
unit 10 of the horn speaker 1. The following description will focus on the sound introduction unit
40.
[0035]
The sound guiding portion 40 is a tube having a square cross section, and as shown in FIG. 4, a
part of the wall surface of the main body of the horn speaker 4 consisting of the spacer ring 90,
the top plate 81, the annular magnet 82 and the back plate 80 It is part of the wall surface of the
part 40. The role of the sound introducing unit 40 is the same as the roles of the sound
introducing unit 10 of the first embodiment and the sound introducing unit 20A and the sound
introducing unit 20B of the second embodiment. Further, the lengths of the sound introducing
portions 40 provided one by one at two symmetrical positions with respect to the central axis ax
of the pole piece 85 are the same.
[0036]
Similarly to the first to third embodiments, also in the horn speaker 4, distortion of sound can be
eliminated by utilizing Helmholtz resonance in which the sound guiding portion 40 is a neck and
the back cavity BC is a cavity.
[0037]
In the case of the horn speaker 4 as in this embodiment, as in the first to third embodiments, the
sound of the horn speaker 4 is inexpensive and does not burden the user as compared with the
technique disclosed in Patent Document 1. Can eliminate the distortion of
Moreover, compared with the technique disclosed by patent document 2, frequency can be
controlled finely and sound can be controlled inexpensively. Furthermore, in the case of the horn
speaker 4 as in this embodiment, since the sound guiding unit 40 and the main body of the horn
speaker 4 share the wall surface, the horn speaker 4 can be made compact.
[0038]
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<Modifications> Although the first to fourth embodiments of the present invention have been
described above, the following modifications may of course be added to these embodiments. (1)
In the above embodiment, the cross-sectional shape of the sound guiding portion in each
embodiment is square, but the cross-sectional shape of the sound guiding portion is trapezoidal
or round depending on the sound quality of the sound to be emitted and the design of the horn
speaker. It may be in the form of Furthermore, the sound guiding portion is not limited to the
elongated tube, and rotates around a space (that is, central axis ax) covering the compression
driver (i.e., the compression driver including phase plug 86 and diaphragm 87) of the horn
speaker in the above embodiment. It may be a shape that forms a space that becomes a body.
[0039]
(2) In the above embodiment, the sound guiding portions are provided at two positions
symmetrical with respect to the central axis ax of the pole piece 85 of each embodiment, but the
symmetry may be broken Good. For example, all the sound guiding parts may be provided only
above the horn speaker from the central axis ax. Further, the sound guiding unit may be provided
to make one turn of the horn speaker around the center axis ax.
[0040]
(3) In the above embodiment, the lengths of the sound introducing portions provided at
symmetrical positions with respect to the central axis ax are the same, but may be different. By
making the lengths of the respective sound guides different, it is possible to broaden the
variation of the adjustment.
[0041]
(4) The second embodiment and the third embodiment may be combined. For example, as in the
third embodiment, the user may change the length of the sound guiding unit 20B of the horn
speaker 2 of the second embodiment.
[0042]
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(5) The second or third embodiment and the fourth embodiment may be combined. In this aspect,
in addition to the effects of the second or third embodiment, the horn speaker can be made
compact, which is the effect of the fourth embodiment. When the second embodiment and the
fourth embodiment are combined, only one of the two sound introducing parts having different
lengths has the spacer ring 90, the top plate 81, the annular magnet 82, and the back. A part of
the wall surface of the horn speaker body formed of the plate 80 may be used. Furthermore, both
of the two types of sound guides having different lengths may use part of the wall surface of the
horn speaker body. For example, FIG. 5 (A) is a perspective view showing the sound guiding unit
20A ', and FIG. 5 (B) is a perspective view showing the sound guiding unit 20B'. The sound
guiding portion 20B 'has a threshold 200 and is longer than the sound guiding portion 20A'. The
sound introducing unit 20A 'and the sound introducing unit 20B' respectively correspond to the
sound introducing unit 20A and the sound introducing unit 20B of the second embodiment. By
using such a sound guiding unit 20A 'and the sound guiding unit 20B', it is possible to take an
aspect in which the second embodiment and the fourth embodiment are combined. Furthermore,
only one of the two sound guiding parts uses a part of the wall surface of the horn speaker main
body, and the other sound guiding part uses a part of the wall surface of the horn speaker main
body. A part of the wall of the sound section may be used.
[0043]
(6) In the third embodiment, the pin 300 is used to fix the sound guiding unit 30A and the sound
guiding unit 30B with the sound guiding unit 30A and the sound guiding unit 30C, but the sound
guiding unit 30A is the sound guiding unit Any method may be used as long as it can be fixed to
30B or the sound guiding portion 30C. For example, the pin 300 is a screw, and screw holes are
provided in the sound guiding unit 30A, the sound guiding unit 30B and the sound guiding unit
30C, and the sound guiding unit 30A and the sound guiding unit 30B and the sound guiding unit
30A and the sound guiding unit 30C are screws. It may be fixed by.
[0044]
(7) In the third embodiment, the sound guiding unit 30A may have a telescopic structure. FIG. 6
is a perspective view of the sound guiding portion 30A 'showing this aspect. The sound guiding
unit 30A 'is provided with a slide mechanism 320, and the length of the sound guiding unit 30A'
is fixed by a pin 310. The user uses the slide mechanism 320 to adjust the length of the sound
guiding portion 30A 'to a length corresponding to the sound to be controlled, and fixes the length
of the sound guiding portion 30A' with the pin 310. With such a sound introducing unit 30A ',
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there is no need to prepare various length sound introducing units 30A, and the burden on the
user is reduced.
[0045]
(8) In the above embodiment, the spacer ring 90 supports the outer peripheral portion of the
edge 89, and the edge 89 supports the outer peripheral portion of the diaphragm 87. However,
the edge 89 and the diaphragm 87 may be integrated. . In this embodiment, the spacer ring 90
directly supports the outer peripheral portion of the diaphragm 87. The back cavity BC in this
aspect is a space surrounded by the diaphragm 87, the spacer ring 90 and the back cover 95.
Also, the spacer ring 90 may be omitted. In this case, both end surfaces of the back cover 95 are
directly fixed to the end surface of the top plate 81 opposite to the annular magnet 82. In this
aspect, when the edge 89 and the diaphragm 87 are not integrated, the inner peripheral portion
of the top plate 81 may support the outer peripheral portion of the edge 89 or the inner
peripheral portion of the back cover 95 may support it. . The back cavity BC in this aspect is a
space surrounded by the diaphragm 87, the edge 89 and the back cover 95. When the edge 89
and the diaphragm 87 are integrated in a mode in which the spacer ring 90 is omitted, the inner
periphery of the top plate 81 may support the outer periphery of the diaphragm 87 or the inner
periphery of the back cover 95 The part may support. The back cavity BC in this aspect is a space
surrounded by the back cover 95 and the diaphragm 87.
[0046]
1, 2, 3, 4, 8 ... horn speaker, 10, 20A, 20B, 20A ', 20B', 30A, 30A ', 30B, 30C, 40 ... sound guiding
part, 200 ... threshold, 300, 310: pin 320: slide mechanism 80: back plate 81: top plate 82:
annular magnet 83: sound conduction hole 84: horn 85: pole piece 86 Phase plug, 87:
diaphragm, 88: voice coil bobbin, 89: edge, 90: spacer ring, 94: throat portion, 95: back cover,
96: sound release hole, ax: central axis, OS: Space, AG: Magnetic gap, BC: Back cavity.
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