JPH0833075

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DESCRIPTION JPH0833075
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus incorporated and used in video equipment such as a television receiver and a
television receiver using the same.
[0002]
2. Description of the Related Art A typical prior art example of this type of speaker apparatus will
be described below with reference to the drawings.
[0003]
FIG. 4 is a plan sectional view showing the structure of a conventional built-in type speaker
device from above, and in FIG. 4, reference numeral 1 denotes an opening having an elongated
rectangular shape.
An acoustic pipe 2 has a reflector 3 inside. Further, the sound absorbing material 4 is disposed at
two places between the reflection plate 3 and the side surface and the bottom surface of the
acoustic pipe, and the tweeter 5 is disposed near the center. Reference numeral 6 denotes a rear
cabinet having a port 7. The rear cabinet 6 is attached via the baffle surface 8 of the acoustic
tube 2, and a woofer 9 is attached to the baffle surface 8.
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[0004]
When an input signal is applied to the woofer 9 and the tweeter 5 of the speaker apparatus
configured as described above, the diaphragms thereof are vibrated, and sound waves are
emitted from the woofer opening surface 10 and the tweeter 5 to produce acoustic waves. It is
led to the opening 1 through the tube 2. Further, from the back surface of the woofer 11, the
sound wave of the antiphase component of the sound wave is emitted, and the sound wave of a
part of frequency band is emitted from the port 7 by the volume of the rear cabinet 6 and the
tuning of the port 7 It is configured to form a comprehensive output sound pressure frequency
characteristic with the sound wave emitted from 1).
[0005]
SUMMARY OF THE INVENTION However, in the above-described conventional configuration,
restrictions on the mechanism and design of the television receiver are considered in order to
give top priority to the incorporation into a device such as a television receiver. Port 7 had to be
located in the center of the rear cabinet 6.
[0006]
Accordingly, when the sound wave emitted from the back surface of the woofer 11 does not
resonate in the back surface cabinet 6 when forming the above-mentioned overall output
frequency characteristic, it is directly emitted through the port 7 and the frequency band of the
mid-high frequency component is The acoustic wave emitted from the front opening 1 cancels
out and adversely affects the reproduction frequency characteristic.
[0007]
Further, the pressure of the sound wave due to the amplitude at the time of the speaker
operation increases or decreases the pressure in the rear cabinet 6 to increase the occurrence of
the harmonic distortion in the acoustic characteristic.
[0008]
In order to solve this problem, increasing the thickness of the material of the rear cabinet 6,
increasing the number of internal ribs, and increasing the thickness lead to an increase in cost, as
well as the appearance of the mold structure and appearance, etc. There are also issues such as
the simultaneous occurrence of the problems of
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[0009]
The present invention is to solve the above-mentioned conventional problems, and it is an object
of the present invention to provide a speaker device capable of achieving higher quality of a
television receiver and a television receiver using the same. It is a thing.
[0010]
SUMMARY OF THE INVENTION In order to solve the problem, in the speaker device of the
present invention, a speaker is coupled to the front, a bass reflex port is provided on the rear side
of the speaker, and internal upper and lower walls are provided. Each of the cabinets has a
cabinet provided with a rib of a cross section and a reinforcing plate fitted to the rib of the cross
section provided on each of the upper and lower walls inside the cabinet.
[0011]
[Function] With this configuration, the reinforcing plate is fitted to the rib portions of the crosssections provided on the upper and lower walls inside the cabinet, thereby suppressing the
increase and decrease of the pressure generated inside the cabinet at the time of the operation of
the speaker. The reinforcing plate disposed between the back of the speaker and the port can
suppress the sound wave of the mid-high range component directly radiated through the port to
improve the disturbance of the frequency characteristic.
[0012]
That is, the rigidity of the cabinet can be simply increased by the reinforcing plate, and at the
same time the back pressure of the speaker is adjusted by the reinforcing plate, so that good
sound quality and bass reproduction can be achieved without deteriorating the reproduction
frequency characteristics. It is possible.
[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described below with reference to the drawings.
The same reference numerals as those described in the prior art indicate the same parts.
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[0014]
FIG. 1 is a plan cross-sectional view of the speaker apparatus according to an embodiment of the
present invention as viewed from above.
In FIG. 1, reference numeral 1 denotes an opening having a long and thin rectangular shape.
An acoustic pipe 2 has a reflector 3 inside.
Further, the sound absorbing material 4 is disposed at two places between the reflection plate 3
and the side surface and the bottom surface of the acoustic tube 2, and the tweeter 5 is coupled
to the vicinity of the center.
[0015]
A rear cabinet 6 has a port 7, and a space formed in the acoustic pipe 2 and the rear cabinet 6 by
the baffle surface 8 of the acoustic pipe 2 and the woofer 9 coupled thereto is shown. It is
divided.
Reference numeral 10 denotes a woofer opening surface, and when an input signal is applied to
the speaker, a sound wave is emitted from the opening 1 through the acoustic tube 2.
Further, a reinforcing plate 12 is disposed inside the rear surface cabinet 6 between the woofer
rear surface portion 11 and the port 7 adjacent thereto, and the sound wave of the reverse phase
component emitted from the rear surface of the woofer 11 is port 7 Prevents the direct emission
of the mid-high frequency component sound wave.
[0016]
FIG. 2 is a cross-sectional view of the speaker device of FIG. 1 as viewed from the rear surface
direction of the A-A 'cross section.
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In FIG. 2, 2 is the said acoustic pipe.
6 is a rear surface cabinet having a port 7 and 11 is a rear surface of the woofer which is coupled
to the baffle surface of the acoustic tube 2. In FIG. 2, the reinforcing plate 12 is fitted in the
shape of a reinforcing rib 13 of a cross-section having a comb shape respectively formed on the
upper and lower walls inside the rear surface cabinet 6, and mounted using the upper and lower
plane portions of the rear surface cabinet 6. The rigidity is simply increased.
[0017]
The reproduction frequency characteristics of the loudspeaker apparatus of the present
invention and the conventional loudspeaker apparatus configured as described above are shown
in FIG.
[0018]
In FIG. 3, reference numeral 14 denotes the reproduction frequency characteristic of the
loudspeaker system of the present invention, and 15 denotes the reproduction frequency
characteristic of the conventional loudspeaker system for comparison.
As can be seen from FIG. 3, it can be seen that a significant improvement effect can be obtained
with the reproduction frequency characteristic 14 of the speaker device of the present invention
as compared with the reproduction frequency characteristic 15 of the conventional speaker
device. This is because, among the restrictions on the design of the television receiver, the
arrangement of the port of the bass reflex type cabinet for low-frequency enhancement has to be
close to the back of the speaker unit, so that the direct radiation of the reverse phase acoustic
wave and the port It solves the problem of having an adverse effect on the reproduction
frequency characteristics of the conventional speaker device, such as the low frequency
attenuation due to the same condition as the increase of the equivalent mass due to the mutual
impedance of the diaphragm. is there.
[0019]
That is, it is possible to satisfactorily reproduce the synthetic waveform in phase and in phase
with the sound wave emitted from the opening 1 of the acoustic tube 2 without attenuating the
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low frequency component emitted from the low frequency enhancement bass reflex port. It is
possible to realize reproduction as acoustic characteristics, and further, by simply increasing the
rigidity of the rear surface cabinet, it is possible to suppress an increase or decrease in the
pressure in the cabinet due to the back pressure at the time of the speaker vibration. As a result,
it is possible to suppress harmonic distortion.
[0020]
As described above, according to the present invention, a simple reinforcing plate is disposed
between the port in the bass reflex type cabinet of the speaker device and the rear portion of the
speaker adjacent to the port. As a result, it is possible to realize a speaker device having
reproduction frequency characteristics with less peak dip, and when this speaker device is
mounted on a television receiver, sound reproduction close to ideal can be made possible.
[0021]
Brief description of the drawings
[0022]
1 is a plan sectional view showing the configuration of the speaker device according to an
embodiment of the present invention from above.
[0023]
2 is a cross sectional view seen from the A-A 'cross section of FIG. 1
[0024]
Fig. 3 is a characteristic diagram comparing the reproduction frequency characteristics of the
speaker device according to the same embodiment and the characteristics of the conventional
speaker device.
[0025]
4 is a plan sectional view showing the configuration of the conventional speaker device as viewed
from above.
[0026]
Explanation of sign
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[0027]
Reference Signs List 1 opening 2 acoustic tube 3 reflection plate 4 sound absorbing material 5
speaker (tweeter) 6 rear cabinet 7 port 8 baffle surface 9 speaker (woofer) 10 woofer opening
surface 11 woofer rear surface 12 reinforcing plate 13 reinforcing rib 14 of the speaker device
of the present invention Reproduction frequency characteristics 15 Reproduction frequency
characteristics of the conventional speaker device
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