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DESCRIPTION JPS5572377

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DESCRIPTION JPS5572377
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are front views showing an example of a
television receiver for explaining the present invention, and FIG. 3 is a cross-sectional view
showing an example of a speaker system according to the present invention. Fig. 4 is a side view
showing the state of the magnetic flux, and Fig. 5 is a side view showing the magnetic flux of the
conventional speaker system. 5 and 6 are speaker units, and ral and 7b are permanent magnets.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a loudspeaker system
suitable for use in the reception of audio multiplex broadcasts and stereo broadcasts of television
receivers. Recently, in television broadcasting, so-called audio multiplex broadcasting and stereo
broadcasting have been carried out. Among them, in the case of damage to stereo broadcasting,
the speaker is especially television 9! It is possible to install it on Alii of the cathode ray tube.
That is, as shown in FIG. 1, the picture tube (2) is disposed substantially at the center as seen
from the front of one shell (1) of the television receiver, and the picture tube (2) is disposed
within this same frame fil. Speaker system (3a) and (3b) l on both left and right 111 '# or shown
in FIG. 2 (11 in-! As described above, the speaker systems <38) and (3b) are accommodated in
the-housing of the receiver housing (1), and the nine speaker boxes (4a) and (4b) are disposed
close to each other. This makes it possible to watch the stereo broadcast while watching the
television. And as speaker systems (3a) and (3b) in this case, at least two speaker units I (e.g.,
high-range speaker unit (5) and mid-range speakers) different from each other in the prime
frequency band range. It can be configured with the unit (6). Thus, when the speaker systems
(3a) and (3b) are disposed near the picture tube (2) of the television receiver, the leakage flux
from the permanent magnet used in the speaker unit adversely affects the electron beam of the
picture tube. There is a drawback that mis-landing of so-called one child beam occurs. If the
magnetic head is disposed near the tape recorder, the magnetic head is converted to a direct
current to deteriorate the characteristics. For this reason, conventionally, the speaker unit used
for the television receiver 4IIN + is provided with a magnetic shield so that the permanent
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magnet used especially for it does not leak to the outside (2) 0 °. There is a drawback that the
length becomes expensive when it is shielded. This invention is a solution to the abovementioned disadvantages of the simple S, which will be described with reference to FIG. 3 as an
embodiment of the invention. The figure is a cross-sectional view of the speaker system (3a) or
(3b), where the upper speaker unit (51 is for high rise and the lower speaker unit (6) is for
midrange. In the drawings, (7a) and (7b) are annular permanent magnets of the speaker units (5)
and (6), (8a) and (8b) are pole pieces, (9a) and U (9b) are disk-shaped magnetic Yaw, (10M) and
(10b) are a-poles formed in a ring shape with a magnetic material.
(Lla) and (1 lb) Fi: I-7, that is, a diaphragm, (12a) and (12b) are voice = + il, (13a) and (13b) Fi
mini 2 parts. The frame and the diaphragm of the speaker unit are respectively omitted. 04) is a
speaker box, which can also be used as a television receiver. In this invention, the polarity of the
permanent magnets (7a) and (7b) constituting a part of the magnetic circuit 暑 heat and b b of at
least two of the squikayu (3) 1, "knits (5) and (6) is It is chosen to be opposite to each other. That
is, as generally shown in FIG. 5Ks, the permanent magnets (7a) and (7b) used for the speaker unit
are generally such that the front is S 椿 and accordingly the direction is an N pole. ? ばれている
。 In the present invention, as shown in FIG. 3 and FIG. 4, since the polarity of the permanent
magnet is a book having 111 opposite polarities, for example, the permanent magnet (7b) of the
lower speaker system (6) The direction of) is reverse to that of the normal speaker unit. In the
conventional speaker systems (3a) and (3b), as shown in FIG. 5, the polarity of the permanent
magnets (7a) and (7b) of the two speaker units 15) and (6) is l + i1 to five. As it is selected to be
−, the leakage flux from these two permanent magnets (7a) and (7b) will mutually repel between
14ai E (7a) and (7b), The magnetic flux 同 which is more to the one side, so by placing a
loudspeaker system with such a loudspeaker unit close to the receiver 11f 2 +, thick (4 + 5 ....
According to the present invention, it is apparent from FIG. 4 that the magnets (7a) and (7b) of
the two speakers (5) and (6), respectively, are clearly visible. The magnetic flux) generated from
the individual magnets tends to be absorbed by the other magnet since the inertia of the) is
mutually reversed, so the magnetic flux へ moves outward from the speaker system It has six
features that can be greatly suppressed from leaking. Also, since it is possible to naturally
suppress the magnetic flux leakage to the outside in this way, it is not necessary at all to provide
a magnetic shield which has been conventionally required, or it is very easy to provide it. Have
the effect of Moreover, in the conventional speaker unit, it is sufficient to merely change the
direction of misery of the stone of one of the speaker units without changing the structure at all.
There is no need to mf mf <
In the embodiment shown in FIG. 3, a bed-shaped stone (71) (7b) is used, or a magnetic yoke (b)!
It is apparent that the present invention can be applied to the case where the pole pieces (8a)
and (sb) t-magnets are used. Furthermore, in the embodiment, although the case where two
speaker units (5) and (6) are used has been described, it can be similarly configured even in the
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case of three or more individual t. In this case, the leakage magnetic flux due to the
magnetomotive force in one direction and the leakage magnetic flux in the other direction are
almost in the size of I−. Then, the direction of the magnet i of each speaker unit may be selected.
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