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JPH06303688

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DESCRIPTION JPH06303688
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus in which an acoustic tube is coupled to the front of a speaker used in a
television receiver, an automobile and various audio equipment.
[0002]
2. Description of the Related Art In recent years, a speaker apparatus using an acoustic tube
having a smaller area and a rectangular opening than a baffle plate on which a speaker is
mounted has been widely used.
[0003]
A conventional speaker apparatus of this type will be described below.
FIG. 4 is a cross-sectional view showing the configuration of the conventional speaker device. In
FIG. 4, 1 is an acoustic lens provided on the front of the speaker 2, 3 is a sound path for guiding
the sound wave 4 emitted from the speaker 2 to the sound path 5, and 6 is an acoustic tube. It
consists of eight.
[0004]
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1
In the conventional speaker device thus configured, when an input signal is applied to the
speaker 2 first, the diaphragm 9 vibrates and the sound wave 4 is radiated from the opening 10
through the sound path 3 and the sound path 5. . However, since the acoustic impedance is
largely changed at the opening 10, a part of the sound wave 4 is reflected and returns to the
sound path 5, and a standing wave is generated and the reproduced sound pressure frequency
characteristic of the peak dip is disturbed It was something that
[0005]
Therefore, in order to solve this phenomenon, the sound absorbing material 8 is disposed inside
the acoustic pipe 6 to absorb standing waves, and the acoustic lens 1 controls the reproduction
sound pressure frequency characteristic, and the flat reproduction sound pressure frequency
characteristic Was designed to create The reflection plate 7 acts so that the sound wave 4
emitted from the diaphragm 9 is not directly absorbed by the sound absorbing material 8.
[0006]
However, in the above-described conventional configuration, it is necessary to dispose the sound
absorbing material 8 in order to suppress the peak dip on the reproduced sound pressure
frequency characteristic, and the variation of the sound absorption coefficient of the sound
absorbing material 8 is as it is. The quality problems that affect the dispersion of the reproduced
sound pressure frequency characteristics, the causes of the technical problems that the sound
absorbing material 8 absorbs the directly radiated sound waves 4 other than the standing wave
to degrade the reproduced sound pressure It also became. Furthermore, it is necessary to provide
a cover at the portion where the sound absorbing material 8 is to be disposed, and the
construction cost is increased due to the fact that the operation becomes complicated and the
material cost becomes expensive.
[0007]
An object of the present invention is to solve such conventional problems and to provide a
speaker device capable of securing high performance and quality and reducing costs.
[0008]
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2
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker device of the
present invention has a rectangular opening at the tip end to form a sound path for guiding a
sound wave, and at least one of the longer diameter side surfaces. A hollow portion is formed
between an acoustic tube which is partially open and coupled to the front surface of the speaker,
and a sound path along the sound path on the side of the speaker unit coupled to the inside of
the acoustic tube. A reflecting plate and a communicating portion formed by extending the side
wall of the acoustic tube toward the end of the reflecting plate are adopted.
[0009]
With this configuration, the standing wave in the acoustic pipe generated by the reflected wave
from the opening can be suppressed by the hollow portion without arranging the sound
absorbing material, and the deterioration of the reproduced sound pressure by the sound
absorbing material can be prevented. Also improve the flat reproduction sound pressure
frequency characteristic, and when the part where the part of the long diameter side of the
acoustic tube is open is incorporated in the TV cabinet, this part of the TV cabinet is shared as
the sound path Material cost can be saved, cost can be reduced, and quality can be stabilized.
[0010]
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a conceptual view of the speaker device in the embodiment.
In FIG. 1, reference numeral 11 denotes an acoustic pipe having a rectangular opening 12 and an
opening 13 at the tip end thereof and an opening 13 provided on the long diameter side, and the
acoustic pipe 11 is coupled to the front of the speaker 14 to be radiated from the speaker 14 A
sound path 16 for guiding a sound wave 15 to be generated, a pair of reflecting plates 17
provided along the path of the sound path 16 on both sides of the sound path 16, and the side
walls of the reflecting plate 17 and the acoustic tube 11 By extending the side wall of the
acoustic tube 11 toward the cavity 18 and the end of the reflection plate 17, a communication
portion 19 connecting the cavity 18 and the inside of the acoustic tube 11 is configured.
[0011]
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3
The operation of the loudspeaker apparatus of the present invention configured as described
above will be described with reference to FIG.
First, the sound wave 15 radiated from the diaphragm 20 of the speaker 14 passes through the
sound path 16 and is emitted to the outside from the opening 12 at the tip of the acoustic tube
11 and the opening 21 of the television cabinet (described in detail later). A standing wave is
generated between the diaphragm 20 and the opening 21 due to the reflected wave at the
opening 21, and the reproduced sound pressure frequency characteristic of the peak dip is
severely disturbed. However, the acoustic cavity resonance can be generated at any frequency by
providing the cavity portion 18 and the communication portion 19 to generate the standing
wave, so the frequency of the standing wave generated in the acoustic tube 11 On the other
hand, it is possible to adjust the frequency of the cavity resonance by changing the volume of the
cavity portion 18 and the area of the communication portion 19 and to control the frequency
characteristics to suppress the deterioration of the reproduced sound pressure frequency
characteristics.
[0012]
FIG. 3 is a cross-sectional view of an essential part showing a state in which the speaker device
according to the present invention is attached to the inside of a television receiver, in which 21 is
an opening provided in the television cabinet 22 and 23 is a cathode ray tube. is there.
[0013]
In the speaker device of the present invention thus mounted, the television cabinet 22 constitutes
a part of the acoustic tube 11 by bringing the opening 13 having the long diameter side face of
the acoustic tube 11 open into close contact with the television cabinet 22. The speaker device as
described above with respect to the frequency of the standing wave generated inside the acoustic
tube 11 by the distance between the opening 21 of the television cabinet and the diaphragm 20
formed in the television cabinet 22. The frequency characteristics of the reproduced sound
pressure can be controlled by adjusting the frequency of the cavity resonance of the above, so
that it becomes possible to create the optimum reproduced sound pressure frequency
characteristics of the television receiver.
[0014]
As described above, by providing the hollow portion and the communication portion in the
acoustic pipe, the speaker device according to the present invention improves the degradation of
the reproduced sound pressure due to the sound absorbing material, which is the problem of the
conventional acoustic pipe, By controlling the reproduced sound pressure frequency
03-05-2019
4
characteristic, it is possible to create a flatter reproduced sound pressure frequency
characteristic.
[0015]
In addition, it is possible to reduce the variation in the characteristics due to the sound absorbing
material, reduce the material cost and the processing cost, and provide a speaker device with
stable quality, less expensive, and excellent in reproduced sound pressure frequency
characteristics. It is of great practical value.
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5
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