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DESCRIPTION JPH04358499

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DESCRIPTION JPH04358499
[0001]
OBJECT OF THE INVENTION
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus for bass reproduction with good bass reproduction.
[0003]
2. Description of the Related Art Conventionally, various types of speaker devices for reproducing
low-pitched waves for TV have been considered.
However, because of the space-saving design, the cabinet width of the TV is almost determined
by the inch size of the CRT. That is, the width of the TV tube is about 600 mm at 29 inches and
about 510 mm at 25 inches. It has been difficult to produce a speaker device for bass
reproduction that can reproduce good bass in such a space-limited manner and store it in a TV
cabinet.
[0004]
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[0004] As a conventional speaker device for reproducing a low frequency sound for TV, there are
devices as shown in FIG. 6 to FIG. FIG. 6 is an exploded perspective view of the speaker, and FIG.
7 is a cross-sectional view of the speaker device. The speaker device 1 for reproducing a low
frequency sound of TV according to the present invention has an arrow 4 around the front of the
frame 3 of the speaker 2 and is provided at the opening end of the cylindrical box 5 on the front
side of the diaphragm 2 a of the speaker 2. After temporarily installing the frame 3 and the
arrowhead 4 in the step portions 6 and 7, the rear end of the frame 3 is pressed by the end
portion 9 of the cylindrical box 8 on the rear side of the diaphragm 2a of the speaker 2 The box
8 is fastened with a bolt 10 to fix and fix the speaker 2. At this time, the speaker device 1 for
reproducing high-frequency sound of TV is separated by the speaker 2 into a sealed box 11
which is on the front side of the diaphragm 2 a of the speaker 2 and a resonance box 12 which is
on the rear side. Also, the resonance box 12 communicates with the outside through the
resonance tube 13.
[0005]
[0005] In the same manner as the above-mentioned speaker, for example, a speaker which is
configured to be separated into a resonance box on the front side of the speaker diaphragm and
a closed box on the rear side to improve the bass reproduction characteristics, for example, One
proposal is made in the publication 152394.
[0006]
The bass reproduction characteristic of a general speaker device is as long as the diaphragm of
the speaker is supported sufficiently softly.
[0007]
[Equation 1]
[0008]
Given by
Here, ◎ fob: lowest resonance frequency momo: equivalent mass of the vibration system Co Co:
compliance of the box viewed from the diaphragm.
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In order to lower the low range of the above-mentioned speaker device 1 for reproducing the low
frequency of TV and reproduce the excellent low frequency, it is necessary to increase the
compliance Co in order to lower the lowest resonance frequency fob according to the above
equation (1) Or, it is necessary to increase the equivalent mass mo of the vibration system.
However, an increase in the equivalent mass mo of the vibration system causes the efficiency of
the speaker to be reduced, so it is necessary to increase the compliance Co of the box, that is, the
inner volume. However, since the TV cabinet is limited in width dimension, it is not possible to
increase the cylinder length to increase the internal volume of the cylindrical box.
[0009]
Therefore, in order to increase the internal volume of the cylindrical box, the speaker device 14
for reproducing bass of TV shown in FIG. 8 is provided with an auxiliary ring 15 on the speaker
2, and this auxiliary ring 15 is connected to the diaphragm 2 a of the speaker 2. After
temporarily installing at the opening end of the cylindrical box 16 on the front side, the back of
the auxiliary ring 15 is pressed by the end of the cylindrical box 17 on the rear side of the
diaphragm 2a of the speaker 2, and the cylindrical box 16 and the cylindrical box 17 The
speaker 2 is fixed by fastening and fixing it with a bolt 10. At this time, the speaker device 14 for
reproducing the low frequency sound for TV is separated by the speaker 2 and the auxiliary ring
15 into a sealed box 18 located on the front side of the diaphragm 2 a of the speaker 2 and a
resonance box 19 located on the rear side. ing. The rear resonance box 19 is in communication
with the outside through the resonance tube 20.
[0010]
Since the speaker apparatus 14 for reproducing a high frequency band for TV having the abovedescribed structure is installed in the width direction of the rear surface of the cathode ray tube
of the TV cabinet, the width size is limited. In order to lower the lowest resonance frequency
within this limitation, the volume is increased and the compliance Co is increased by increasing
the diameter of the cylindrical boxes 16 and 17. However, since the speaker 2 can not be directly
attached to the cylindrical boxes 16 and 17 when the diameter of the cylindrical boxes 16 and
17 is increased as described above, the auxiliary ring 15 is attached to the speaker 2 to make the
cylindrical box 16 And 17 were attached. That is, although the volume of the speaker device 14
can be increased by attaching the auxiliary ring 15 to the speaker 2, the cost is increased by
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attaching the auxiliary ring 15 to the speaker 2, and the support of the speaker 2 is not
supported. There is a risk of stability.
[0011]
SUMMARY OF THE INVENTION As described above, the conventional bass reproduction speaker
apparatus increases the volume by increasing the diameter of the cylindrical box in order to
lower the lowest resonance frequency, thereby achieving compliance Co. It was big. However,
increasing the diameter of the cylindrical box requires an auxiliary link for mounting the speaker,
which not only causes an increase in cost, but also causes the support of the speaker to be
unstable.
[0012]
The present invention eliminates the above-mentioned problems, and in order to lower the lowest
resonance frequency, the diameter of the cylindrical box is increased without increasing the
width dimension of the cabinet to increase the volume of the cylindrical box. It is an object of the
present invention to provide a speaker device for bass reproduction, in which a speaker can be
attached to the cylindrical box in a stable state without using a speaker auxiliary ring.
[0013]
[Configuration of the Invention]
[0014]
【0014】
[0015]
SUMMARY OF THE INVENTION A speaker device for bass reproduction according to the present
invention is a loudspeaker device for bass reproduction, in which a speaker is fixed between
cylindrical boxes respectively disposed on the front side and the rear side of a speaker
diaphragm. And fixing the speaker by holding the frame of the speaker by the open end of the
one cylindrical box on the speaker diaphragm side and the rib provided in the cylinder of the
other cylindrical box. The speaker apparatus for low-pitched sound reproduction having the
configuration has the speaker frame mounted between the opening side end of the one speaker
box side of the cylindrical box and the rib provided in the cylinder of the other cylindrical box.
Because the diameter of one of the cylindrical boxes is larger than the diameter of the speaker,
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the bass range can be made better by increasing the volume. The ability.
[0016]
Embodiments of the present invention will be described below with reference to the drawings.
1 to 3 relate to an embodiment of the present invention, and FIG. 1 is an exploded perspective
view showing a part of the speaker device cut away, FIG. 2 is a sectional view of the speaker
device, and FIG. 3 is a characteristic diagram showing frequency characteristics. It is.
[0017]
As shown in FIG. 1 and FIG. 2, the speaker device 21 for reproducing a low-pitched sound of TV
comprises the above-mentioned speaker between the cylindrical box 23 on the front side of the
diaphragm 22a of the speaker 22 and the cylindrical box 24 on the rear side. 22 is configured to
sandwich.
In the front side cylindrical box 23, a flange 25 having an internal thread for connection and
fixation with the rear side cylindrical box 24 is provided on the side of the speaker 22, and at the
base of the flange 25, a frame 26 of the speaker 22 is provided. And, step portions 28 and 29 are
provided for sandwiching and fixing an arrow 27 which is circumferentially provided on the
front surface of the frame 26 and which functions as an attachment.
In the rear side cylindrical box 24, a flange 30 having an internal thread for connection and
fixation with the front side cylindrical box 23 is provided on the speaker 22 side, and an inner
wall of the rear side cylindrical box 24 is, for example, The four ribs 31 are erected in the inner
diameter direction.
Furthermore, while the end face of the rear cylindrical box 24 opposite to the flange 30 is closed,
a cylindrical resonance pipe 32 extends axially inward at the center thereof. The speaker 22
sandwiches the frame 26 and the arrowhead 27 of the speaker 22 by the step portions 28 and
29 of the front side cylindrical box 23 and the ribs 31 of the rear side cylindrical box 24, and
fastens the flanges 25 and 30 by the bolt 32. Fixed and fixed. At this time, the speaker device 21
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for reproducing the low-frequency sound for TV is separated by the speaker 22 into a closed box
33 located on the front side of the diaphragm 22 a of the speaker 22 and a resonance box 34
located on the rear side.
[0018]
The volume of the resonance box 34 on the rear side of the speaker apparatus 21 having the
above-described configuration is free by increasing the diameter of the rear cylindrical box 24
and changing the height of the ribs 31 provided on the inner wall. It can be set to That is, since
the speaker 22 is held between the rib 31 of the inner wall of the rear side cylindrical box 24 and
the step portions 28 and 29 provided on the front side cylindrical box 23, the diameter of the
rear side cylindrical box 24 Even if it is large, it can be fixed without the need for an auxiliary
ring. Further, the connection between the front side cylindrical boxes 23 and 24 can be made by
enlarging the flanges 25 and 30 provided on the front side cylindrical boxes 23 and 24,
respectively. Furthermore, the strength when the inner diameter of the rear side cylindrical box
24 is increased is increased because the rib 31 for holding the frame 26 of the speaker 22
becomes a reinforcing rib.
[0019]
The speaker device 21 changes the diameter of the rear side cylindrical box 24 to increase the
volume of the rear side resonance box 34 and also uses the ribs 31 provided on the inner wall of
the rear side cylindrical box 24 to make the rear side cylindrical box By increasing the strength
of 24, it is possible to reproduce a good bass with less distortion.
[0020]
FIG. 3 is a characteristic diagram showing the relationship between the sound output and the
frequency according to the present invention.
The frequency characteristic of the embodiment of the present invention is represented by a
solid line in the figure, and it can be seen that the lowest resonance frequency is lowered. The
broken line is the characteristic when the volume of the conventional speaker device is not
increased.
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[0021]
FIG. 4 is a cross-sectional view of a speaker apparatus according to a modification of the present
invention. In this modification, the cylindrical resonance tube 32 provided in the rear side
cylindrical box 24 of the above embodiment is provided on the end face of the front side
cylindrical box 23 opposite to the speaker. The other components are the same as those of the
above embodiment, and the same members are denoted by the same reference numerals. The
effects and advantages are also the same as those of the above embodiment.
[0022]
As described above, according to the embodiment of the present invention, the speaker device 21
for reproducing bass according to the present invention can reproduce bass in the bass region by
increasing the volume of the cylindrical box by lengthening the diameter direction without
lengthening the length direction. Since it is good, as shown in FIG. 5, it is possible to arrange in
the width direction space of the back surface of the cathode ray tube of the TV cabinet 41.
[0023]
As described above, in the speaker apparatus for reproducing low-pitched sound according to the
present invention, the diameter of the cylindrical box is increased without increasing the width of
the cabinet in order to lower the lowest resonance frequency. Thus, the volume of the cylindrical
box can be increased, and the speaker can be attached to the cylindrical box in a stable state
without using the speaker auxiliary ring.
[0024]
Brief description of the drawings
[0025]
1 to 3 relate to an embodiment of the present invention, and FIG. 1 is an exploded perspective
view showing a part of the speaker device cut away.
[0026]
2 is a cross-sectional view of the speaker device.
[0027]
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FIG. 3 is a characteristic diagram showing frequency characteristics.
[0028]
4 is a cross-sectional view of a speaker apparatus according to a modification of the present
invention.
[0029]
5 is a schematic explanatory view when the speaker device is installed in the TV cabinet.
[0030]
6 to 8 relate to the conventional example, and FIG. 6 is an exploded perspective view of the
speaker device.
[0031]
7 is a cross-sectional view of the speaker device.
[0032]
8 is a cross-sectional view of another example of the speaker device.
[0033]
Explanation of sign
[0034]
21 ... Speaker device for bass reproduction 22 ... Speaker 23 ... Forward cylindrical box 24 ... Rear
cylindrical box 25 ... Flange 26 ... Frame 30 ... Flange 31 ... Rib 32 ... Resonance tube
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