close

Вход

Забыли?

вход по аккаунту

?

JPH089486

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH089486
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus in which an acoustic tube for guiding a sound wave is connected to the front
of a speaker used for video equipment such as a television receiver, a car and various audio
equipment. .
[0002]
2. Description of the Related Art A method of connecting a horn or an acoustic tube to the front
of a speaker and guiding a sound wave generated from the speaker to the opening of the abovementioned acoustic tube is more effective than the case where a horn or an acoustic tube is not
used. There is an advantage that a large pressure can be obtained, and sound can be transmitted
in a specific direction, and so on, which has been widely used conventionally.
[0003]
Hereinafter, a speaker apparatus using a conventional acoustic tube will be described with
reference to the drawings.
FIG. 5 is a structural conceptual view of a television receiver incorporating the above-mentioned
conventional speaker device. In FIG. 5, 1 is an acoustic tube, 8 is a speaker, 24 is a television
cabinet, 25 is a cathode ray tube, and 26 is a back cabinet.
03-05-2019
1
[0004]
The operation of the television receiver incorporating the speaker apparatus configured as
described above will be described. As shown in FIG. 5, a speaker device in which an acoustic tube
1 for guiding a sound wave is coupled to the front of the speaker 8 is incorporated along a
cathode ray tube 25 inside a television receiver, and a television cabinet 24 is added to the
speaker device. By adopting the structure along the line, it is possible to miniaturize the
television receiver.
[0005]
FIG. 4 is a plan sectional view showing the structure of a conventional speaker apparatus in
which the above-mentioned sound tube 1 is coupled to the front of the speaker 8. As shown in
FIG. In FIG. 4, 9 is a diaphragm of the speaker 8 for generating sound waves, 10 is an edged rib
for sealingly coupling the speaker 8 and the acoustic tube 1, and 7 is a narrowing portion of the
throat provided on the front of the speaker 8 Reference numeral 2 denotes a reflecting wall
provided on both sides for guiding the sound wave emitted from the speaker 8 to the acoustic
pipe opening 3. Reference numeral 2 is a sound absorbing material, and 4 is a sound path
through which the sound wave passes.
[0006]
The operation of the conventional speaker apparatus configured as described above will be
described below.
[0007]
First, when an input signal is applied to the speaker 8, the diaphragm 9 of the speaker vibrates,
and a sound wave is emitted from the acoustic tube opening 3 through the sound path 4 inside
the acoustic tube 1. .
However, since the acoustic impedance is largely changed at the acoustic pipe opening 3, a part
of the sound wave is reflected and returned to the sound path 4 to make a standing wave, and a
03-05-2019
2
constant wave generated at the length of the acoustic pipe 1 Due to the presence of waves, the
reproduced sound pressure frequency characteristic of the peak-dip is extremely disturbed.
[0008]
However, the sound absorbing material 2 disposed inside the acoustic tube 1 absorbs and
suppresses the standing waves to create a flat reproduction sound pressure frequency
characteristic. Furthermore, the reflecting wall 5 is disposed so that the sound emitted from the
diaphragm 9 of the speaker and enhanced by the throat narrowing portion 7 is not directly
absorbed by the sound absorbing material 2, and particularly works also for high frequency
correction. As a result, natural acoustic reproduction can be performed by the acoustic tube
opening 3 configured to be elongated and approximately shaped like a rectangular shape.
[0009]
However, in the above-described conventional configuration, as shown in FIG. 4, the sound
absorbing material 2 provided to suppress the standing wave generated inside the acoustic tube
1 has a mid-high frequency component. Even if the sound wave is absorbed, the reflection wall 5
is provided for the purpose of preventing this phenomenon, but the attenuation of the highfrequency reproduction band is large as shown by the reference numeral 19 in FIG. Had the
problem of lowering the In addition, in order to suppress standing waves, a large amount of the
sound absorbing material 2 has to be used, and a problem remains in terms of cost.
[0010]
The present invention solves the above-mentioned conventional problems, and aims to improve
the sound pressure frequency characteristic of the reproduction band in the high region and to
reduce the cost, and further to improve the acoustic characteristic in which the reproduction
sound pressure frequency characteristic becomes flat. It aims at providing a speaker apparatus.
[0011]
SUMMARY OF THE INVENTION In order to solve the problem, the speaker device of the present
invention is provided with an acoustic tube which guides a sound wave having a rectangular
opening at the front of the speaker, and the inside of this acoustic tube A throat portion having
wall surfaces formed to narrow the effective area of the vibration portion of the speaker once
and then diffuse it is provided on the front portion of the speaker, and sound absorption is
03-05-2019
3
performed on both side surfaces inside the acoustic tube serving as the end of the throat portion.
And a reflective wall disposed in close contact with the inner surface of the sound absorbing
material to form a wall, and a first reflective plate and a second reflective plate disposed in
parallel between the two reflective walls and facing each other. Thus, a sound path for guiding
the sound wave emitted from the speaker is formed between the first and second reflecting
plates.
[0012]
[Operation] With this configuration, even in a speaker device having a horn or an acoustic tube
whose opening has a long and narrow rectangular shape in consideration of incorporation into
the device, the reflecting wall from the acoustic tube throat to the opening end inside the
acoustic tube The sound path formed by the first reflecting plate disposed further inside and the
second reflecting plate disposed in parallel to be opposite to the first reflecting plate is the sound
path of the high-reproduction band, and The sound wave in the high frequency range emitted
from the diaphragm can be emitted to the opening end of the acoustic pipe through this sound
path, and the characteristics of the high frequency reproduction frequency band can be
improved.
[0013]
Embodiment 1 A first embodiment of the present invention will be described below with
reference to the drawings.
[0014]
FIG. 1 is a plan cross-sectional view of the speaker apparatus mainly composed of an acoustic
tube in the embodiment, and the same reference numerals are given to parts having the same
configuration as the conventional speaker apparatus described with reference to FIG. , Detailed
description is omitted.
In FIG. 1, reference numeral 8 is a speaker for full band reproduction, and an acoustic tube 1A
for guiding a sound wave having an elongated rectangular shape for the acoustic tube opening 3
in consideration of installation in a device is an edge It is sealingly connected via the standing rib
10.
[0015]
03-05-2019
4
Reference numerals 11 and 12 denote a first reflection plate and a second reflection plate
disposed inside the acoustic tube 1A. The first reflecting plate 11 and the second reflecting plate
are disposed facing each other from the vicinity of the narrowing portion 7 of the throat to the
opening 3 so as to guide the emitted sound wave to the opening 3 of the acoustic tube 1A. A
sound path 13 is formed between the sound path 12 and the sound path 12 to correct the
acoustic characteristics.
[0016]
The operation of the speaker apparatus of the present invention configured as described above
will be described below.
First, when an input signal is applied to the speaker 8, the diaphragm 9 vibrates, and the sound
wave is guided to the opening 3 of the acoustic tube through the sound path 13 formed inside
the acoustic tube 1A.
At that time, the distance between the first reflection plate 11 and the second reflection plate 12
is adjusted to change the width of the sound path 13, thereby generating a standing wave in a
specific frequency band to emphasize the sound pressure. can do.
It is possible to improve the sound pressure in the high frequency band by setting the distance at
which the resonance phenomenon unique to the acoustic tube occurs well so that the standing
wave is generated in the high frequency band in this way. It will be
[0017]
The sound pressure frequency characteristic of the speaker device according to the present
embodiment is shown by reference numeral 20 in FIG. 3 in comparison with the sound pressure
frequency characteristic of the conventional speaker device.
[0018]
As can be seen from FIG. 3, by arranging the first and second reflecting plates 11 and 12
disposed inside the reflecting wall 5 in parallel with each other with a certain distance, At the
same time as adjusting the standing wave generated inside the acoustic tube 1A, it is possible to
make the sound pressure frequency characteristic have a small peak dip and the sound pressure
03-05-2019
5
in the high sound range be high.
[0019]
Further, by incorporating the speaker device of the present invention in a television receiver, it is
possible to easily realize the downsizing and slimming of the television receiver, and to provide a
high performance and high sound quality television receiver. It is possible.
[0020]
Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with
reference to the drawings.
[0021]
FIG. 2 is a front sectional view seen from the direction of the opening of the speaker apparatus
mainly composed of the acoustic tube in the embodiment.
[0022]
In FIG. 2, 1B is an acoustic tube, 11A is a first reflecting plate arranged to be inclined in the
vertical direction, and 12A is non-parallel to the position facing the first reflecting plate 11A. The
second reflection plate 13A is a sound path formed between the first reflection plate 11A and the
second reflection plate 12A.
[0023]
In the case of the loudspeaker apparatus according to the present embodiment configured as
described above, the distance between the first reflection plate 11A and the second reflection
plate 12A and the inclination thereof are adjusted to obtain the first reflection plate 11A and the
first reflection plate. By adjusting the distance L2 equal to the distance L1 of the upper part of
the second reflector 12A and the lower part thereof, the frequency band of the standing wave
generated in the sound path 13A is not the specific frequency band but the first reflector 11A
and It becomes possible to disperse between the frequency bands determined by the distance L1
at the upper part of the second reflector 12A and the distance L2 at the lower part, and to
prevent occurrence of a large peak dip and flatten the high-pass audio band It is possible to
improve the sound pressure in the high range.
[0024]
Further, by arranging the first reflection plate 11A and the second reflection plate 12A to have
03-05-2019
6
different lengths, the distance between the first reflection plate 11A and the second reflection
plate 12A, the inclination In the above, it is possible to generate a standing wave that does not
occur, and it is possible to control the sound pressure frequency characteristics in a wider range.
[0025]
By adjusting the distance, inclination, and length between the first reflection plate 11A and the
second reflection plate 12A in this manner, the resonance frequency is manipulated to correct
the frequency band of 2 to 20 kHz. It is possible to make the set configuration, improve the
sound pressure of 2 to 20 kHz, which is an important frequency band in the high range, and
realize the improvement of the sound pressure in the high range which can not be realized by the
conventional product It is.
In particular, by raising the high band, the peak dip of the reproduced sound pressure frequency
characteristic can be suppressed, and the acoustic characteristic can also be made flat.
[0026]
Further, by controlling the standing wave by the first reflection plate 11A and the second
reflection plate 12A, the suppression of the standing wave can be realized with a smaller amount
than the amount used of the conventional sound absorbing material. The cost can also be
reduced.
[0027]
Also, when viewed as the reproduced sound pressure frequency characteristic when this speaker
device is incorporated into a television receiver, it becomes possible to make it a characteristic
with less peak dip, and in the high frequency range which can not be realized by the conventional
product. Sound pressure can be improved, reproduction sound pressure frequency
characteristics can be flattened, and the amount of sound absorbing material can be reduced, so
that excellent acoustic characteristics can be realized.
[0028]
It is needless to say that the same effect can be obtained even when the rear surface cabinet and
the bass reflex port etc. are provided in the speaker device constituted by the structure of the
acoustic tube of the present invention.
03-05-2019
7
[0029]
As described above, the speaker device according to the present invention can improve the sound
pressure of 2 to 20 kHz, which is an important frequency band constituting the high frequency
band, and has a small peak dip. Flat reproduction sound pressure frequency characteristics can
be achieved, and excellent acoustic characteristics can be realized that improve the sound
pressure in the high region that can not be achieved with conventional products, and the
resonance frequency is manipulated by two reflectors By doing this, the amount of the sound
absorbing material disposed inside the acoustic tube can be reduced, and a speaker device
superior in cost can be realized.
[0030]
Brief description of the drawings
[0031]
1 is a plan sectional view showing the configuration of the speaker device according to the first
embodiment of the present invention.
[0032]
2 is a front sectional view showing the configuration of the speaker device according to the
second embodiment of the present invention
[0033]
Fig. 3 Characteristic diagram comparing the reproduced sound pressure frequency
characteristics of the speaker device of the present invention with the reproduced sound
pressure frequency characteristics of the conventional speaker device
[0034]
4 is a plan sectional view showing the configuration of the conventional speaker device
[0035]
Fig. 5 A structural conceptual diagram of a television receiver incorporating a speaker device
using a conventional acoustic tube
03-05-2019
8
[0036]
Explanation of sign
[0037]
1A, 1B Acoustic tube 2 Sound absorbing material 3 Acoustic tube opening 5 Reflective wall 7
Throat narrowing portion 8 Speaker 9 Diaphragm 10 Edged rib 11, 11A First reflector 12, 12A
Second reflector 13, 13A Sound Road 20 Sound pressure frequency characteristics of the
speaker device according to the present invention
03-05-2019
9
Документ
Категория
Без категории
Просмотров
0
Размер файла
17 Кб
Теги
jph089486
1/--страниц
Пожаловаться на содержимое документа