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DESCRIPTION JPH08154296

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DESCRIPTION JPH08154296
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
slim rectangular speaker having a long and thin rectangular shape, which is mainly used for
video equipment such as a television receiver and a computer display.
[0002]
2. Description of the Related Art A method of providing a horn or an acoustic tube on the front of
a speaker and guiding the sound wave generated from the speaker to a slim opening has
advantages such as achieving slimming of a television receiver etc. Many are used. However, in
order to realize proper sound reproduction using an acoustic tube, there is a drawback that the
internal structure of the acoustic tube becomes complicated and the cost also increases.
[0003]
Therefore, as a means for solving these problems, a system has been considered in which a
speaker configured in a slim shape by using the prior art is disposed on the side of a cathode ray
tube such as a television receiver.
[0004]
Hereinafter, a speaker configured in a slim shape using the prior art will be described with
reference to the drawings.
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[0005]
FIG. 8 is a cross-sectional view of a speaker in which the shape of the diaphragm and the edge is
made slim and has a substantially rectangular shape by using the prior art.
[0006]
In FIG. 8, 1 is a slim and substantially rectangular cone-shaped diaphragm, 2 is an edge provided
to hold the outer peripheral portion of the cone-shaped diaphragm 1, and 3 is a frame in which
the outer periphery of the edge 2 is fixed. , 4 is a dust cap, 5 is a voice coil, 6 is a voice coil
bobbin, 7 is a gold wire for inputting a signal to the voice coil 5, 8 is a voice coil bobbin 6 with
inner and outer peripheral ends to support the voice coil 5 A damper fixed to the frame 3, 9 is a
main magnet, 10 is an upper plate, 11 is a lower plate, 12 is a cancel magnet, and 13 is a cancel
cover.
[0007]
FIG. 9 is a plan view of the conventional speaker shown in FIG.
The conventional speaker configured as described above will be described below.
As shown in FIG. 9, by arranging the frame 3 and the cone-shaped diaphragm 1 and the edge 2
to be a slim speaker having a substantially rectangular shape, it is disposed on the side of a
cathode ray tube such as a television receiver. In this case, the sound wave emitted from the
cone-shaped diaphragm 1 of the speaker can be mainly made of direct sound radiation, and
natural sound reproduction becomes possible.
[0008]
However, in the above-described conventional configuration, as shown in FIG. 9, the dimensions
of the upper plate 10 and the cancel cover 13 constituting the magnetic circuit become larger
than the dimensions of the rectangular side of the frame 3 and television When slimming a
receiver etc., it had the fault that it will receive design restrictions.
[0009]
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Furthermore, FIG. 10 illustrates the vibration mode of the rod-shaped vibrating body at each
frequency at both ends free vibration, but as shown in FIG. 10, a cone-shaped diaphragm
configured in a slim and substantially short shape The same vibration mode occurs at each
frequency in 1 and the vibration direction for transmitting sound waves between the central part
and both ends of the cone-shaped diaphragm 1 when the center drive system of the cone-shaped
diaphragm 1 is simply used. This causes the phenomenon that the phases of the phases are
different, and as shown in FIG. 11, there is a problem that flat reproduction of high frequency
characteristics can not be obtained by this phenomenon.
[0010]
Reference numeral 14 shown in FIG. 10 indicates the position of the node with respect to the
fundamental sound, reference numeral 15 indicates the position of the node with respect to the
frequency of the first overtone, and reference numeral 16 indicates the position of the node with
respect to the frequency of the second overtone It is.
[0011]
In addition, sufficient sound pressure can not be obtained with a speaker configured using only
one magnetic circuit configured using the conventional cancel magnet 12 and the cancel cover
13, and the damper 8 is provided inside the frame 3 that configures the speaker. Since it is
necessary to store the shape of the damper 8 as shown in FIG. 9 because it is necessary to store
it, the amplitude capability of the damper 8 is determined by this, and as a result, the input
resistance of the speaker is suppressed. It also had the disadvantage of being
[0012]
The present invention solves the above-mentioned conventional problems, and an object thereof
is to further improve the sound quality and the performance of a slim rectangular speaker used
for video equipment such as a television receiver or a computer display. It is.
[0013]
[Means for Solving the Problems] In order to solve this problem, a slim rectangular speaker
according to the present invention is a slim diaphragm having a substantially rectangular shape
and a cone-shaped diaphragm and an edge constituting a speaker vibrating member, A plurality
of magnetic circuits for driving the vibrating member in a multipoint drive system and a plurality
of dampers capable of large amplitude, and a plurality of nodes arranged on the cone-shaped
diaphragm are driven and arranged A ring-shaped neodymium magnet is used for the magnetic
circuit, and the magnet is disposed to face the gap constituting the magnetic circuit, and is
radially magnetized in the circumferential direction, and a plurality of dampers are further
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3
disposed. , And an oval shaped damper or a rhombus shaped damper so that a large amplitude
can be obtained.
[0014]
According to this configuration, it is possible to achieve high sound quality and high performance
of a slim rectangular speaker used for video equipment such as a television receiver or a
computer display.
[0015]
An embodiment of the present invention will be described below with reference to the drawings.
The same reference numerals as in FIGS. 8 to 11 described in the above-mentioned conventional
example indicate the same parts.
[0016]
FIG. 1 is a front cross-sectional view of a slim rectangular speaker according to an embodiment
of the present invention.
In FIG. 1, reference numeral 17 denotes a cone-shaped diaphragm having a plurality of drive
positions and having a substantially rectangular shape, and 2 an edge provided to hold the outer
peripheral portion of the cone-shaped diaphragm 17; 18 is a frame configured to fix the outer
periphery of the edge 2 and to fix a plurality of magnetic circuits, 4 is a dust cap, 5 is a voice coil,
6 is a voice coil bobbin, 7 is a gold wire, 19 is a voice coil 5 A damper 20 has both inner and
outer ends fixed to a voice coil bobbin 6 and a frame 18, 20 is a ring-shaped neodium magnet,
and 21 is a ring-shaped neodium magnet 20 disposed to face the gap 22 constituting a magnetic
circuit. It is a yoke that is configured.
[0017]
FIG. 2 is a plan view of a slim rectangular speaker according to the embodiment of the present
invention shown in FIG.
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[0018]
In the case of the slim rectangular speaker of the present invention configured as described
above, even if the shapes of the frame 18, the cone-shaped diaphragm 17 and the edge 2 are slim
and almost rectangular in consideration of incorporation into equipment A ring-shaped
neodymium magnet 20 is used in the magnetic circuit, arranged to face the gap 22 constituting
the magnetic circuit, and radially magnetized in the circumferential direction as indicated by 23
in FIG. By doing this, as shown in FIG. 3, the dimensions of the yoke 21 constituting the magnetic
circuit can be set smaller than the dimensions of the short side of the frame 18, and as a result,
slimming of the television receiver etc. It becomes possible without being restricted by
[0019]
3 shows a side sectional view of the slim rectangular speaker according to the embodiment of the
present invention shown in FIG. 1, and FIG. 4 shows the slim rectangle according to the
embodiment of the present invention shown in FIG. FIG. 6 is a plan view of an essential part of a
magnetic circuit unit of the speaker.
[0020]
Further, by arranging a plurality of magnetic circuits of the above configuration, the efficiency of
the slim rectangular speaker can be improved, and the sound pressure level can also be satisfied.
[0021]
5 and 6 are plan views showing the configuration of an elliptical damper 19-a or a rhombus
damper 19-b as the damper 19 for a slim rectangular speaker according to the embodiment of
the present invention shown in FIG. FIG. 7 is a characteristic diagram comparing sound pressure
frequency characteristics of a speaker using the slim rectangular speaker of the present
invention and a conventional cone-shaped diaphragm.
[0022]
As shown in FIG. 5 and FIG. 6, by making the damper 19 into an oval shaped damper 19-a or a
rhombus shaped damper 19-b, it can be housed inside the frame 18 and has excellent amplitude
characteristics and hence is resistant to input It is also possible to improve the system, and
further, a plurality of driving positions are arranged at the positions of a plurality of nodes
generated in the cone-shaped diaphragm 17 having a shape similar to a slim and substantially
rectangular shape. Thus, as shown in the characteristic diagram of FIG. 7, in the case of the slim
rectangular speaker according to the present invention, it is possible to obtain flat sound
pressure frequency characteristics up to high frequency characteristics.
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[0023]
As described above, according to the present invention, the vibrating member of the speaker is
constituted by the slim, substantially rectangular shaped cone-shaped diaphragm and the edge,
and the vibrating member is driven by the multipoint drive method. A plurality of magnetic
circuits, a plurality of dampers capable of large amplitude, driving positions of a plurality of
nodes generated in the cone-shaped diaphragm, and using ring-shaped neodium magnets in the
plurality of arranged magnetic circuits An arrangement wherein the magnet is disposed to face
the gap constituting the magnetic circuit and is magnetized radially in the circumferential
direction, and a plurality of dampers are further disposed so as to allow a large amplitude to be
an elliptical damper A slim rectangular speaker used for video equipment such as a television
receiver or a computer display by having a rhombic damper Are those high quality and high
performance can be achieved, and, in which ultra-low leakage reduction can be realized.
[0024]
Brief description of the drawings
[0025]
1 is a front sectional view of a slim rectangular speaker according to an embodiment of the
present invention
[0026]
2 is a plan view of the slim rectangular speaker in the same embodiment.
[0027]
Fig. 3 Side cross-sectional view of the slim rectangular speaker in the same embodiment
[0028]
4 is a plan view of the main part of the magnetic circuit portion of the slim rectangular speaker
in the embodiment.
[0029]
Fig. 5 A plan view of a damper in which an elliptical damper is used as the slim rectangular
speaker in the same embodiment.
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[0030]
Fig. 6 A plan view of a damper showing a state where a rhombic damper is used for the slim
rectangular speaker in the same embodiment.
[0031]
Fig. 7 A characteristic diagram comparing sound pressure frequency characteristics of a speaker
using the slim rectangular speaker of the present invention and a conventional cone-shaped
diaphragm
[0032]
Fig. 8 A front cross-sectional view of a speaker in which the shape of the diaphragm and the edge
is made slim and almost rectangular in shape using the conventional technique
[0033]
9 is a plan view of the conventional speaker shown in FIG.
[0034]
Fig. 10 Vibration mode diagram of rod-shaped vibrating body at each frequency at both ends free
vibration
[0035]
Sound pressure frequency characteristics of the speaker using the conventional cone-shaped
diaphragm shown in FIG.
[0036]
Explanation of sign
[0037]
DESCRIPTION OF SYMBOLS 2 edge 4 dust cap 5 voice coil 6 voice coil bobbin 7 gold wire 17
cone shaped diaphragm 18 frame 19 damper 19-a oval shaped damper 19-b rhombus shaped
damper 20 ring shaped neodium magnet 21 yoke 22 gap 23 radial attachment Magnetic
direction
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