JPH0847076

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DESCRIPTION JPH0847076
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus in which a horn-like acoustic tube for guiding a sound wave to the front of the
speaker is disposed, and a television receiver using the same.
[0002]
2. Description of the Related Art Conventionally, a method of providing a horn or an acoustic
tube on the front of a speaker and guiding a sound wave generated from the speaker to the
opening is more specific than in the case where the horn or the acoustic tube is not used. There
are advantages such as the sound being transmitted, and this method has been taken in many
ways until now.
[0003]
However, in general, frequency characteristics should be flat characteristics, but in such a
method of guiding sound waves with an acoustic tube, due to the influence of the acoustic tube,
the frequency characteristics are as shown by the dotted line in FIG. As shown, peaks and dips
appear.
Such a peak and a dip are in a contradictory relationship that a dip of the same size appears
when there is a peak on the frequency characteristic.
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[0004]
In order to suppress these peaks and dips, for example, those disclosed in JP-A-4-165797
(H04R1 / 34) and JP-A-5-168082 (H04R1 / 34) have been proposed. There is.
[0005]
That is, this speaker device is shown in FIG.
In FIG. 4, reference numeral 1 denotes a speaker, which includes a speaker driving unit 1a and a
speaker sound emitting unit 1b. An acoustic pipe 2 formed in a rectangular shape and having a
horn shape is formed by a speaker arrangement opening 8 in which the speaker 1 is disposed, a
sound wave output opening 10 in which sound waves are output, and peaks and dips by the
sound pipe 2 It comprises a sound absorbing material 6 for suppressing undesirable
characteristics, a recess for fitting the sound absorbing material 6, and a lid 7 for closing the
recess 9.
[0006]
Next, a method of attaching the speaker 1 and the acoustic tube 2 will be described. First, the
speaker sound emitting unit 1b of the speaker 1 is attached to the speaker placement opening 8
with a screw or the like (not shown). Then, the sound absorbing material 6 is inserted into the
recess 9 into which the sound absorbing material 6 disposed above and below the acoustic tube
is fitted, and the lid 7 is closed. Thereafter, the lid 7 is adhered to the acoustic tube 2 with the
adhesive 18 so as not to open the lid 7 so as to maintain the degree of sealing.
[0007]
As shown in FIG. 5, the loudspeaker apparatus in which the loudspeaker 1 and the acoustic tube
2 are combined is arranged in a television receiver as constructed above. That is, the speaker
device is disposed in the gap between the cathode ray tube 52 of the television receiver and the
front cabinet 51 so that the sound wave output opening 10 of the acoustic tube 2 is in front of
the television receiver.
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[0008]
In this case, since the speaker device can be disposed utilizing the gap of the television receiver,
the space for the television receiver can be effectively utilized, and the cabinet can be
miniaturized.
[0009]
However, in the speaker apparatus having such a configuration, the sound absorbing material 6
is attached to eliminate the peak and dip of the frequency characteristic as described above.
However, when assembling the speaker apparatus, the sound absorbing material 6 is not There is
an operation in which the inset lid 7 has to be fixed by the adhesive 18, and it takes time for the
manufacturing process and the cost of the product is high.
In addition, since the structure of the acoustic tube becomes complicated, there is a problem that
the mold shape of the acoustic tube becomes complicated.
[0010]
SUMMARY OF THE INVENTION The present invention has been made in view of the abovementioned point, and the influence of the peak and dip of the frequency characteristic of the
speaker apparatus comprising the speaker and the acoustic pipe can be made with a simple
configuration. The purpose is to be able to reduce.
[0011]
SUMMARY OF THE INVENTION According to the present invention, an acoustic tube is disposed
which is disposed on the front of a speaker and which guides a sound wave having an elongated
portion having an elongated and substantially rectangular shape, and the inside of the acoustic
tube Is configured in the shape of a horn that constitutes sound conduction of sound waves
radiated from the speaker so that the area is large at the front part of the speaker and the area
decreases as approaching the opening, and the area where the speaker of the acoustic tube is
disposed The present invention is a speaker device characterized in that a radiation hole for
suppressing a sound wave of a specific frequency characteristic is provided on the side of the
larger opening.
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[0012]
Further, the present invention is a television receiver using the speaker device.
[0013]
According to the present invention, with the above configuration, it is possible to suppress peaks
and dips in the frequency characteristics by providing the radiation hole for suppressing the
sound wave in the acoustic tube, and flat frequency characteristics can be obtained. Sounds good.
[0014]
Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is an exploded view of a speaker apparatus according to an embodiment of the present
invention. Reference numeral 21 denotes a speaker, which comprises a speaker driving unit 21a,
a speaker sound emitting unit 21b, and a baffle plate 5.
[0015]
An acoustic pipe 22 comprises a rectangular speaker arrangement opening 11 and a sound wave
output opening 4 for emitting sound. The area of the speaker arrangement opening 11 is the
sound wave output opening It is larger than the area of 4.
[0016]
Further, two radiation holes 3 are provided in the inner wall 9 on the speaker placement opening
11 side.
The inner side wall portion 9 of this inside is as shown in FIG. 2 when the speaker device is
viewed from below.
The inner wall 9 is configured such that the angle A with the baffle plate 5 of the speaker is
smaller than the angle A ′ between the outer wall 10 and the baffle plate 5.
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The radiation holes 3 are provided at two positions in the width half of the height 1/3 range of
the inner side wall portion 9.
[0017]
The operation of the loudspeaker apparatus configured as described above will be described
below.
First, when an audio signal is input to the speaker 21, the acoustic signal emitted from the
speaker 21 has peaks and dips like the dotted line in FIG. 3 on the frequency characteristics
determined by the structure of the acoustic tube 22 in the acoustic tube 22. A standing wave is
generated, and a sound wave having a peak and a dip is similarly emitted from the sound wave
output opening 4.
[0018]
However, the radiation hole 3 provided in the inner wall surface 9 of the acoustic tube 22
relieves the pressure that the acoustic signal emitted from the speaker 21 applies to the inner
wall of the acoustic tube 22 and the standing within the acoustic tube 22. Suppress the
generation of waves.
[0019]
As a result, the sound wave from the sound wave output opening 4 has a frequency characteristic
in which the peak and dip are suppressed as shown by the solid line in FIG.
The position of the radiation hole 3 may be characteristically provided on the inner side wall
portion 9 of (A) having a small angle with respect to the baffle plate 5 of the speaker 21.
[0020]
That is, in FIG. 2, in the inner side wall portion 9 and the inner side wall portion 10 of the
acoustic tube 22, since the inner side wall portion 9 is smaller in angle A with respect to the
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baffle plate 5 of the speaker 21, the acoustic signal emitted from the speaker 21 is Since the
pressure due to this is large, the position of the radiation hole 3 may be provided on the inner
side wall 9 side.
[0021]
By arranging the speaker apparatus configured in this manner in the television receiver as shown
in FIG. 5, it is possible to obtain a good quality sound.
[0022]
As a typical example of such a speaker device, the height H1 of the sound wave output opening 4
(height of the acoustic tube 22) = 180 mm, width W = 12 mm, depth Z1 = 81 mm When the
width W2 of the placement opening 11 is 59 mm and the depth Z2 is 173 mm, the radiation hole
3 is a circle having a diameter of 6 mm centered on the height H2 of 60 mm from the top and
the width W3 of 34 mm. A hole and a circular hole having a diameter of 6 mm are similarly
formed from the lower portion to a height H2 = 60 mm and a width W2 = 34 mm.
[0023]
On the other hand, the speaker 21 may have a diameter of 48 mm for the speaker driving
portion 21a, and the speaker sound emitting portion 21b may have a height H3 = 113 mm and a
width W4 = 50 mm.
[0024]
As described above, according to the present embodiment, by providing the radiation hole 3 in
the inner wall 9 of the acoustic tube 2, the pressure given to the inner wall of the acoustic tube 2
by the acoustic signal emitted by the speaker 1 is alleviated. , Suppress the generation of
standing waves in the acoustic tube 2.
As a result, sound waves with suppressed peaks and dips can be taken out to the sound output
opening 4.
[0025]
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The present invention suppresses the standing waves in the acoustic pipe by providing the holes
in the acoustic pipe without using the sound absorbing material required in the conventional
acoustic pipe, and reduces the peaks and dips. It becomes possible to extract sound waves having
frequency characteristics.
And the speaker apparatus which leads to shortening of the working time of a manufacturing
process and reduction of product cost and die cost can be provided.
[0026]
Brief description of the drawings
[0027]
1 is an exploded view showing an embodiment of the speaker device of the present invention.
[0028]
2 is a view from the bottom of the speaker device of the present invention.
[0029]
3 is a diagram showing the frequency characteristics of the present invention and the
conventional speaker device.
[0030]
4 is an exploded view of the prior art speaker device.
[0031]
FIG. 5 A diagram in which the speaker device is incorporated in a television receiver.
[0032]
Explanation of sign
[0033]
Reference Signs List 21 speaker 21a speaker driving unit 21b speaker sound emitting unit 5
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baffle plate 22 acoustic tube 3 radiation hole 4 sound wave output opening 11 speaker
arrangement opening
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