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JPH1066184

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH1066184
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker system in which a loudspeaker having an acoustic radiation surface as a convex
surface of a conical diaphragm is disposed to be perpendicular to the axis of a sound channel.
[0002]
2. Description of the Related Art A conventional speaker system comprising a speaker and a
sound channel can be described, for example, with reference to FIG. 12 used in a television
receiver. In the speakers 10 and 10, the concave surface of the conical diaphragm is used as the
sound radiation surface. In the speaker system shown in FIG. 12, the horn 20 in the shape of a
sound pipe is curved in a "く" shape from the arrangement relationship of the space of the
television receiver by the cathode ray tube 5, and the shaft of the speaker 10 and the sound pipe
A television receiver is provided with a speaker system in which the 20 axes coincide with the
same direction.
[0003]
Therefore, in the conventional loudspeaker system of this type as shown in FIG. 12, the concave
surface of the conical diaphragm of the loudspeaker 10 is used for the acoustic radiation surface,
Due to the arrangement of the sound channel, an air volume exists on the front surface (within
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the concave surface) of the acoustic radiation surface of the diaphragm, and the high frequency
characteristic is deteriorated due to the compliance by the cavity, and the opening of the speaker
system In the high frequency band, the frequency characteristics of the peak and the dip were
high. Furthermore, since the length of the sound path is made up of the length L of the sound
pipe 20 and the space length l 2 of the front surface of the diaphragm, the sound path becomes
longer, and in the sound pipe 20 The influence of the interference is increased, and the
conduction of the sound wave is disturbed, which causes the generation of peaks and dips in the
frequency characteristics. Therefore, in such a speaker system, it has not been able to escape
from the reproduction sound quality of booming sound with poor clarity.
[0004]
As means for solving the latter problem, as shown in FIG. 11, means for arranging the shaft 20b
′ of the sound path pipe 20 ′, 20 ′ at a right angle to the shaft 10b of the speaker 10 can be
considered. Since the concave surface of the conical diaphragm is used for the acoustic radiation
surface, the problem due to the air volume in front of the diaphragm still does not solve the
former problem and peaks and dips occur in the high frequency characteristic. Further, all the
sound waves radiated from the diaphragm of the speaker 10 are radiated to the inner wall
surface of the sound path pipe 20 ', which also results in a sharp frequency characteristic of peak
and dip.
[0005]
Therefore, in order to solve the problems of the conventional speaker system, the present
invention makes the speaker with the convex surface of the conical diaphragm as the acoustic
radiation surface perpendicular to the axis of the sound channel. To provide a speaker system
capable of improving the reproduction sound quality with the object of improving high frequency
characteristics with substantially no compliance due to the air volume on the front surface of the
diaphragm that has conventionally occurred. It is said that.
[0006]
The structure of the present invention for achieving the object will be described with reference to
FIGS. 1 and 2 corresponding to the embodiments. The present invention has an opening 2a in
one direction. A speaker system in which a speaker mounted with the convex direction of the
conical diaphragm 1a projecting in the front direction is attached at the back of the sound
passage pipe 2 and the shaft 2b of the sound passage pipe and the shaft 1b of the speaker 1 are
perpendicular It is a speaker system arranged.
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2
[0007]
The present invention is the above-mentioned speaker system in which a partition plate 3 in
which a plurality of holes 3a for acoustic filters are bored is disposed at the back of the mounting
position of the speaker 1 in the sound path pipe 2.
[0008]
The present invention is the above-mentioned speaker system in which the diaphragm facing
surface 2c of the sound path pipe 2 is provided so as to be close to the diaphragm 1a at the back
of the speaker attachment position.
[0009]
The present invention is the speaker system described above and in which the sound absorbing
material 4 is filled between the partition plate 3 and the deepest portion of the sound path pipe
2.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION Since the present invention is configured as
described above, the compliance due to the air volume on the front surface of the diaphragm
which has conventionally occurred can be made substantially zero, and the high region due to
this compliance Improve the deterioration of the characteristics.
Furthermore, in the speaker 1 in which the convex surface of the conical diaphragm is an
acoustic radiation surface, the sound wave is radiated not only in the front direction of the
diaphragm but also in the direction perpendicular thereto. By arranging so as to be perpendicular
to the axis, the direct sound is guided in the direction of the sound channel opening 2a, and the
sound wave radiated to the inner wall surface of the sound channel 2 is reduced to improve the
influence of interference by reflection. As a result, the conduction of the sound wave becomes
smooth and the reproduction sound quality can be improved.
[0011]
Then, when the partition plate 3 (FIGS. 3 and 4) in which holes 3a for a plurality of acoustic
filters are drilled is attached at the back of the speaker attachment position in the sound path
pipe 2, identification is made using Helmholtz's resonance phenomenon. Can be absorbed, and
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the interference between the sound wave radiated from the speaker 1 to the sound channel
opening 2a and the reflected sound from the back of the sound channel can be prevented.
[0012]
Further, when the diaphragm facing surface 2c of the sound passage pipe 2 is designed to be
close to the diaphragm 1a in the rear portion of the speaker attachment position, the diaphragm
1a at the attachment position back portion and the inner wall of the sound passage pipe 2 are
formed. Space can be reduced, the acoustic load can be increased, the lowest resonance
frequency f0 can be lowered, and the sharpness Q of the resonance can be reduced, and the
frequency characteristic can be set to be ideal.
[0013]
Furthermore, when the sound absorbing material 4 is filled between the partition plate 3 and the
deepest portion of the sound path tube, the resonance energy of the space can be absorbed, and
the reproduction sound quality is further improved.
[0014]
Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, a diaphragm facing surface 2c covering the back of the speaker attachment position of
the sound channel tube shaped horn 2 of the speaker system of the present invention is provided
close to the diaphragm 1a of the speaker 1 and a partition plate 3 Is attached and the rear
portion is filled with the sound absorbing material 4, and FIG. 2 is a cross sectional view of the
speaker system of the present invention.
[0015]
3 is a front view of the partition plate 3 of the above, FIG. 4 is a top view of the partition plate 3
of the above, FIG. 5 is a longitudinal sectional view of another embodiment of the speaker system
of the present invention In the first embodiment of the speaker system, the frequency
characteristics when the partition plate is not provided and the sound absorbing material 4 is not
filled. FIG. 7 shows the partition plate 3 in the first embodiment of the speaker system of the
present invention. FIG. 8 is a frequency characteristic diagram of the first embodiment of the
speaker system according to the present invention, provided with the sound absorbing material 4
and provided with the partition plate 3 and filled with the sound absorbing material 4 FIG. 9 is a
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graph showing respective sound pressure frequency characteristics of the speakers 1 and 1 ′
(solid line) used in the speaker system of the present invention and the conventional speaker
(dotted line) at 90 ° Off from the axis.
[0016]
FIG. 10 is a longitudinal sectional view of the television system in which the speaker system of
the present invention is mounted, and FIG. 11 is a rear back of the Braun tube 5 with the
speakers arranged in a curved shape. 12 is a longitudinal sectional view of a television receiver
provided with a speaker system in which the axis 10b of the speakers 10, 10 is orthogonal to the
axis 20b 'of the sound pipe 20', 20 '; The speakers 10, 10 are disposed on the right side, the
sound pipe 20, 20 curved in a "く" shape, and the axis of the speakers 10, 10 and the axis of the
sound pipe 20, 20 are aligned in the same direction It is a longitudinal cross-sectional view of the
television receiver provided with the speaker system.
[0017]
The speaker 1 used in the present invention is a dynamic speaker 1 mounted so as to project the
convex direction of the conical diaphragm 1a outward, and the sound path tube 2 is a sound path
tube shaped horn having an opening 2a in one direction. The speaker mounting hole is formed in
a wall surface of a deep portion opposite to the opening 2a.
The convex direction of the conical diaphragm 1a of the speaker 1 is inserted in the inward
direction of the sound path pipe 2, and the axis 1b of the speaker 1 and the axis 2b of the sound
path pipe 2 are disposed at right angles.
[0018]
Further, in the speaker 1 shown in FIG. 1, the conical diaphragm 1a is in a mode in which the
conventional diaphragm is turned over, and the frame 1c holding the end portion holds the end
portion of the diaphragm 1a. The upright portion is formed low from the flat plate portion to
which the magnetic circuit 1d is attached, and the height can be reduced overall.
On the other hand, although the length of the voice coil bobbin is increased correspondingly, the
flat plate portion of the frame 1c and the magnetic circuit 1d are closely attached in this manner,
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and the conical diaphragm 1a is convex outward It can be worn towards the
[0019]
In the speaker system of this embodiment, such a speaker 1 is attached with the convex direction
of the conical diaphragm 1a inserted in the inward direction of the sound path pipe 2 so that the
respective axes 1b and 2b are at right angles. Therefore, the speaker system can be made thinner
and it is effective when it is arranged in a space limited space.
[0020]
Furthermore, in this speaker system, since the sound wave is radiated directly from the conical
diaphragm 1a toward the sound channel opening, the sound wave conduction is smooth.
About this, as shown in FIG. 9, the speaker 1 (solid line) used in this speaker system is superior to
the conventional speaker (dotted line) in that the high-frequency characteristic of 90 ° Off from
the axis is excellent. it is obvious.
[0021]
Since the space behind the speaker shaft 1b in the above-mentioned sound path tube 2 relates to
the acoustic load of the speaker system, in order to make this space smaller and increase the
acoustic load, as shown in FIG. A diaphragm opposing surface 2c covering the back of the
speaker 1 of the sound passage pipe 2 is formed to be close to the diaphragm 1a, and a device
for enhancing the effect is provided.
Further, in detail, the diaphragm opposing surface 2c is formed in a manner such that the back
portion of the sound path pipe 2 is cut in a planar manner so as to be substantially the same as
the inclination of the diaphragm 1a.
[0022]
Incidentally, if this diaphragm opposing surface 2c is formed in a semi-conical shape so as to
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follow the diaphragm 1a shape, it is useful in terms of the above-mentioned acoustic load, but the
manufacture of the sound path tube 2 becomes complicated. By forming, it is possible to simplify
the production without losing the above-mentioned action.
However, the diaphragm opposing surface 2c may be formed in a half cone shape as described
above.
Further, as shown in FIG. 2, the shape of the deepest portion of the sound path pipe 2 is formed
in an arc shape concentric with the diaphragm 1a in consideration of the acoustic load.
Also in this case, if it is intended to further facilitate manufacture, it may be rectangular, for
example, regardless of this shape.
In this way, by increasing the acoustic load, the lowest resonance frequency f0 can be lowered,
and the sharpness Q of the resonance can be lowered, so that it can be brought close to the ideal
frequency characteristic in the speaker system.
[0023]
Further, in the back part in the opposite direction to the opening 2 a of the sound channel shape
2, the partition plate 3 is disposed between the deepest wall of the sound path and the speaker 1.
The partition plate 3 is formed in a curved piece so as to cover the back of the speaker 1 in
accordance with the shape of the sound path tube 2 deepest portion. It is desirable that the
material of the partition plate 3 is, for example, rubber, which is unlikely to resonate with itself.
And in the partition plate 3, a plurality of holes 3a for an acoustic filter are formed in a line. The
holes 3a absorb the direct sound radiated from the speaker toward the back of the sound path
pipe 2 by utilizing the resonance effect of the Helmholtz, and the sound wave and sound path
emitted to the sound pipe opening 2a. 2) It has the effect of preventing interference with the
sound reflected from the back.
[0024]
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In addition, since the sound absorption frequency can be easily adjusted by adjusting the opening
area or the number of the holes 3a, the characteristic change of the speaker system itself can be
easily changed by changing the design of the partition plate 3. Furthermore, since the sound
absorbing material 4 is filled between the partition plate 3 and the deepest portion of the sound
path pipe 2, energy of this internal space can be absorbed.
[0025]
In the first embodiment of the speaker system according to the present invention, FIG. 6 shows a
frequency characteristic diagram in the case where neither the partition plate 3 nor the sound
absorbing material 4 is provided, and one having only the partition plate 3 and one having both.
The characteristic diagrams are shown in FIG. 7 and FIG. 8, respectively. As apparent from the
figure, when the partition plate 3 is provided, the avalence in the high region can be reduced
with respect to the one without the partition plate, and when both the partition plate 3 and the
sound absorbing material 4 are provided, It can be made more gentle than the two examples.
[0026]
Further, as in the speaker 1 ′ shown in FIG. 5, the convex surface of the conical diaphragm 1a is
used as an acoustic radiation surface, and the magnetic circuit 1d is disposed in the space formed
in the back (concave) portion. Since the height h of the entire speaker 1 ′ can be made low and
flat, when attached to the flat sound pipe 2 as in the speaker system of the present invention, the
thickness can be further reduced than the embodiment shown in FIG. The space fit will increase.
[0027]
When the speaker system of the present invention is used for a television receiver, it has a
configuration as shown in FIG.
That is, the speaker system of the first embodiment is disposed on both sides of the cathode ray
tube 5. As described above, when used in a television receiver, it is also possible to emit a sound
wave of reverse phase emitted from the rear surface of the speaker 1 from the side of the
television receiver to the outside to have a surround effect. If this effect is not necessary, the
back of the speaker may be covered so as not to be released to the outside. Further, as in the
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speaker system described in the conventional example, it is also possible to curve the sound path
tube 2 in the shape of “字形” along the cathode ray tube 5 in consideration of the space of the
television receiver. Not shown). In this case, the direct sound guided to the sound path opening
2a is reduced, and the effect based on this is slightly reduced. However, since the other effects
are satisfied, sufficient reproduced sound quality can be obtained. However, if it is bent at a
substantially right angle, the influence of the interference due to the reflection of the sound wave
from the inner wall surface can not be ignored, which is not preferable.
[0028]
Although FIG. 10 shows an embodiment in which the speaker system of the present invention is
used for a television receiver, the technical concept of the present invention is, for example, a
sound system for a cockpit chair type or an audio reproduction device in a car. It is widely used
when it is effective using a conduit.
[0029]
Although the embodiments considered to be representative of the present invention have been
described above, the present invention is not necessarily limited to only the structure of these
embodiments, and includes the above-described components according to the present invention,
and the present invention In order to achieve the purpose mentioned above, the present
invention can be appropriately modified and implemented within the range having the effects
mentioned below.
[0030]
As apparent from the above description, according to the present invention, a speaker having a
convex surface of a conical diaphragm as an acoustic width emitting surface is provided at the
back of a sound channel having an opening in one direction. Since the speaker system is disposed
so as to be perpendicular to the axis of the conduit, the compliance due to the air volume on the
front of the conventional diaphragm can be substantially zeroed, and the degradation of the high
frequency characteristic due to the compliance is improved. And high frequency characteristics
with few peaks and dips.
Furthermore, since the direct sound is directed toward the opening of the sound channel and the
sound wave radiated to the inner wall of the sound channel is reduced, the influence of the
interference due to the reflection can be improved, and the conduction of the sound wave
becomes smooth. And an excellent reproduction sound quality can be obtained.
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[0031]
Then, when a partition plate with a plurality of holes for acoustic filters is attached at the back of
the speaker mounting position in the sound channel, the direct sound radiated to the sound
channel from the speaker is absorbed, and the speaker is It is possible to prevent the interference
between the sound wave radiated to the opening of the sound path tube and the reflected sound
from the back of the sound path tube, and the diaphragm facing surface of the sound path tube is
When formed close to the diaphragm, the acoustic load is increased, the lowest resonance
frequency f0 can be lowered, and the sharpness Q of the resonance can be lowered, so that it can
approach the ideal frequency characteristics in the speaker system. .
[0032]
Brief description of the drawings
[0033]
Fig. 1 The upper surface of the speaker mounting portion of the sound channel tube shaped horn
of the present invention covering the back of the speaker mounting portion is provided close to
the diaphragm of the speaker, and a partition plate is attached and the rear portion is filled with
a sound absorbing material. The longitudinal cross-sectional view which shows the state which
was carried out.
[0034]
2 is a cross-sectional view of the speaker system of the present invention.
[0035]
3 is a front view of the partition plate of the same.
[0036]
4 is a top view of the same.
[0037]
5 is a longitudinal sectional view of the speaker system according to another embodiment of the
present invention speaker system.
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10
[0038]
6 is a frequency characteristic diagram of the first embodiment of the speaker system according
to the present invention when the partition plate is not provided and the sound absorbing
material is not filled.
[0039]
7 is a frequency characteristic diagram of the first embodiment of the speaker system according
to the present invention provided with a partition plate and not filled with a sound absorbing
material.
[0040]
8 is a frequency characteristic diagram of the first embodiment of the speaker system according
to the present invention provided with a partition and filled with a sound absorbing material.
[0041]
[FIG. 9] Each sound pressure frequency characteristic diagram in 90 degrees off from the axis |
shaft of the speaker (solid line) used for this invention speaker system, and the conventional
speaker (dotted line).
[0042]
10 is a longitudinal cross-sectional view of the television receiver having a speaker arranged at
the back of the CRT, to which the speaker system of the present invention having the shape of a
straight sound path tube is attached.
[0043]
Fig. 11 A television receiver having a speaker disposed at the back of the cathode ray tube,
having a "く" -shaped curved sound channel, and having a speaker system in which the axis of
the speaker is orthogonal to the axis of the sound channel. Longitudinal sectional view.
[0044]
Fig. 12 A TV with a speaker system disposed at the back of the cathode ray tube, a "音" curved
sound channel, and a speaker system in which the axis of the speaker and the axis of the sound
channel coincide in the same direction The longitudinal cross-sectional view of a John receiver.
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[0045]
Explanation of sign
[0046]
Reference Signs List 1 dynamic speaker 1a diaphragm 1b speaker shaft 1c frame 1d magnetic
circuit 2 sound passage pipe (sound passage pipe shaped horn) 2a opening 2b shaft 2c of sound
passage pipe diaphragm facing surface portion 3 covering the back of the speaker mounting
portion Board 3a Hole 4 Sound absorbing material 5 Braun tube
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