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JPH1066183

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH1066183
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
horn structure of a speaker, and more particularly to a horn structure capable of effectively
eliminating standing waves generated in the horn.
[0002]
2. Description of the Related Art FIG. 4 shows an example of a speaker and a conventional front
horn (sound path). The speaker unit is indicated by reference numeral 1, and the front horn
disposed in the sound emitting unit 1a of the speaker unit 1 is indicated by reference numeral 2.
The front horn 2 has a shape in which the middle portion is narrowed in this example, and the
sound absorbing material 3 is attached to the entire inner wall surface of the front horn 2.
[0003]
In the speaker configured as described above, the acoustic output generated from the speaker
unit 1 is radiated through the front horn 2, but in the front horn 2, most of the acoustic output
goes straight through the horn and is effective as an acoustic output. Although it radiates, a part
is reflected on the inner wall surface of the front horn 2 and is generated as a so-called standing
wave. Since the presence of the standing wave causes deterioration of the sound quality of the
speaker, the reflected wave reflected to the inner wall surface of the front horn 2 is absorbed by
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the sound absorbing material 3 and removed.
[0004]
However, when the sound absorbing material 3 is formed on the inner wall surface of the front
horn 2, the opening area of the horn 2 is narrowed. If the thickness of the sound absorbing
material 3 is increased in order to enhance the sound absorption effect of the reflected wave, the
opening area of the horn 2 is further narrowed, and as a result, there is a problem that the loss of
acoustic output radiated from the front horn 2 is reduced. is there.
[0005]
In addition, since the standing wave which can not be absorbed by the sound absorbing material
3 leaks into the front horn 2, the sound quality of the speaker can not be sufficiently improved.
[0006]
The present invention has been made to solve the above-mentioned problems, and it is possible
to effectively absorb and eliminate standing waves without the opening area of the horn being
narrowed by the sound absorbing material. It is an object of the present invention to obtain a
speaker horn structure that can eliminate the standing wave which can not absorb the sound as
well, out of the horn.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, the horn structure of a
speaker according to the present invention opens an opening in at least a part of the horn and
closes the opening from the outside of the horn. A sound absorbing material is arranged.
[0008]
With this configuration, a part of the standing wave generated by being reflected by the inner
wall surface of the horn can be absorbed by the sound absorbing material from the opening and
removed out of the horn.
Further, since the sound absorbing material is not formed on the inner wall surface of the horn,
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the opening area of the horn is not narrowed, and the loss of the emitted sound output is not
prevented.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the speaker horn
according to the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram of a speaker in which the front horn is shown in cross section, and FIG.
2 is a view of the front horn as viewed from the front side.
[0010]
The speaker unit is indicated by reference numeral 1, and the front horn disposed in the sound
emitting unit 1a of the speaker unit 1 is indicated by reference numeral 2.
The front horn 2 has a shape in which a substantially middle portion is narrowed in this example.
A relatively large opening 4 is formed on the lower surface side of the narrowed portion of the
front horn 2. A sound absorbing material 5 made of foam urethane foam, felt material or the like
is disposed in the opening 4 so as to be closed from the outside of the front horn 2. The sound
absorbing material 5 is fixed to a part of the structure 6 on which the speaker unit 1 is supported
by adhesion or the like.
[0011]
Here, the relationship between the front horn 2 and the sound absorbing material 5 will be
described in more detail. The sound absorbing material 5 has a size sufficiently covering the
periphery of the opening 4 and has a relatively thick wall thickness. ing. Further, the sound
absorbing material 5 is closely attached because a wind noise is generated due to the presence of
the opening 4 if there is a gap with respect to the outer side surface of the front horn 2, and
preferably, the sound absorbing material 5 is somewhat compressed. It is preferable to press the
front horn 2 in the state.
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[0012]
In the horn structure configured as described above, an acoustic output A going straight from the
sound emitting portion 1a of the speaker unit 1 parallel to the central axis L of the horn is
radiated through the front horn 2 but is reflected to the inner wall surface of the front horn 2 A
part of the standing wave S can be absorbed by the sound absorbing material 5 from the opening
4 and removed out of the horn. The standing wave S0 which can not be absorbed by the sound
absorbing material 5 is discharged from the sound absorbing material 5 to the outside. By this,
the radiation sound radiated from the front horn 2 can be radiated as a high-quality sound
output from which the standing wave is removed.
[0013]
In addition, since the sound absorbing material is not formed on the inner wall surface of the
front horn 2, the opening area of the horn is not narrowed and the loss of the emitted sound
output is not hindered.
[0014]
In addition, since the sound absorbing effect can be enhanced by increasing the thickness of the
sound absorbing member 5, the opening area of the horn 2 can be narrowed even if the sound
absorbing member 5 is thickened by arranging the sound absorbing member 5 on the outer
surface of the horn 2. It is extremely suitable without any obstacles.
[0015]
Further, since the sound absorbing material 5 is made of foam urethane foam, felt material or the
like, the sound absorbing effect is high, and the amount used can be small, so it can be prepared
at low cost.
[0016]
By the way, the present invention is characterized in that a part of the standing wave generated
in the horn 2 is absorbed from the opening 4 into the sound absorbing material 5 and eliminated,
and therefore, a plurality of openings are provided at appropriate places of the horn 2. By
opening and disposing the sound absorbing material at each opening in the same manner as
described above, it is possible to effectively absorb the standing wave generated in the horn 2
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and to increase the rate of removing it out of the horn.
However, if the ratio of the opening to the horn 2 is increased more than necessary, a part of the
effective sound output is also absorbed by the sound absorbing material, so the ratio of the
opening is appropriately selected.
[0017]
Although the embodiment has been described for the case of applying to the front horn, the
invention is similarly applicable to a speaker having a back horn as shown in FIG.
[0018]
That is, the opening 7 is opened in the back horn 6 of the speaker unit 1, and the sound
absorbing material 8 made of foamed urethane foam or felt material is disposed in the opening 7
so as to close the outside of the horn 6. The standing wave S reflected to the inner wall surface of
6 can be absorbed by the sound absorbing material 8 from the opening 7 and eliminated out of
the horn.
[0019]
The present invention is not limited to the embodiments described above and shown in the
drawings, and various modifications can be made without departing from the scope of the
invention.
[0020]
In the embodiment shown in FIGS. 1 and 3, the horn shape is shown as an example in which the
intermediate portion is narrowed, but it is also widely applicable to a straight horn shape or a
trumpet-shaped horn shape as a whole.
[0021]
As described above, in the horn structure of the speaker according to the present invention, the
sound absorbing material is disposed such that the opening is opened in at least a part of the
horn and the opening is closed from the outside of the horn. Thus, the standing wave generated
in the horn can be effectively absorbed by the sound absorbing material and removed out of the
horn, and the horn can emit a sound output with high sound quality.
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[0022]
Moreover, since the sound absorbing material is not formed on the inner wall surface of the horn,
the opening area of the horn is not narrowed, and the loss of the emitted sound output is not
prevented.
[0023]
Further, since the sound absorbing material is made of foam urethane foam, felt material or the
like, the sound absorbing effect is high and the amount used can be small, so it can be prepared
at low cost.
[0024]
Moreover, it can be widely applied to the front horn or back horn of a speaker, and it becomes a
highly reliable speaker device.
[0025]
Brief description of the drawings
[0026]
1 is a block diagram of a speaker device showing a front horn according to the present invention
in cross section.
[0027]
2 is a front view of the horn.
[0028]
3 is a block diagram of a speaker device applied to the back horn.
[0029]
4 is a block diagram of a conventional front horn.
[0030]
Explanation of sign
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[0031]
DESCRIPTION OF SYMBOLS 1 Speaker unit, 2 front horn, 4 openings, 5 sound absorbing
materials, 6 back horns, 7 openings, 8 sound absorbing materials, S standing wave
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