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JPS5829289

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DESCRIPTION JPS5829289
[0001]
The present invention relates to a speaker device, and in particular, to effectively shut off a
magnetic flux leaking from a speaker unit. In general, since a strong magnet is used for the
speaker, when the speaker device is disposed close to a color television receiver or the like, there
is a problem that a color shift occurs in the color television receiver due to the leakage flux from
the magnet of the speaker. In order to solve such a problem, a speaker provided with two
magnets as shown in FIG. 1 is conventionally used. That is, in FIG. 1, 1 is a frame made of a
magnetic material such as iron, 2 is a plate, 3 is a first magnet, 4 is a center pole, 6 is a second
magnet, 6 is an iron cover, 7 is an edge, 8 is a diaphragm and 9 is a dust cover. And the first one.
The second magnets 3.6 are oppositely magnetized. When such a speaker is used, the leakage
flux from the vicinity of the frame 1 is reduced by the magnetic flux of the second magnet 5 and
the leakage flux from the plate 2 and the center pole 4 is reduced by the iron cover 6. Leakage
flux can be reduced. However, in such a speaker, there is a problem that the second magnet 6 is
easily demagnetized at a low temperature, and once demagnetized, the effect of reducing the
leakage flux is reduced. In addition, since the magnetic flux of the second magnet 5 acts to
weaken the main magnetic flux from the first magnet 3 during normal operation, there is a
problem that the sound pressure itself becomes small. Furthermore, since the second magnet 5
and the iron cover 6 have to be incorporated into the interior of the sleeve, the structure is
complicated, the assembly becomes difficult, and the cost increases. Further, as shown in FIG. 2, a
speaker unit 13 comprising a field part 11 and a frame 12 made of iron is attached to a speaker
box 1017) baffle plate 10a, and an iron plate 14 is attached to a side plate 10b of the speaker
box 10. It is also conceivable to shield the leakage flux by means of 14. In this case, one
configuration of the speaker unit 13 can be simplified as compared with that of FIG. 1, and the
leakage flux from the field section 11 can be shielded, but the vicinity of the tip of the iron frame
12 It is impossible to reduce the magnetic flux leakage from the device, and therefore, when this
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1
speaker device is installed near a color television receiver, there is still a problem that color
misregistration still occurs. The present invention provides a speaker device which solves such
conventional problems.
An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.
In FIGS. 3 and 4, parts having the same reference numerals as in FIG. 2 have the same functions.
16.15 is a shielding plate made of a high magnetic permeability material such as iron, boron
steel, permalloy, or amorphous, and the outermost diameter of the shielding plate 15 Jd speaker
unit 13, ie, the outer diameter of the tip of the frame 12 is substantially the same. It has a width,
and as shown in FIGS. 3 and 4, it is attached by a known means such as bonding along the inner
surface of the baffle plate 10a and the inner surface of the side plate 1ob. At the end portions
facing each other, the shield plates 16 ° 150 are formed with curved portions 15a, 15a which
match the outer diameter of the frame 12 of the varnished caninite 13 as shown in FIG. When
the end portions of the portions 15a and 15aij and the frame 12 are attached to the inner surface
of the baffle plate 10a, the end portions of the frame 12 and the inner surface of the baffle plate
10a are held. In this way, the magnetic flux leakage from the field portion 11 is reduced by the
shielding plate 16, and the magnetic flux leaking from the vicinity of the tip of the frame 12 also
passes through the shielding plate 16 having a higher permeability than air. The leakage flux
from the part can be sufficiently reduced, and the leakage of the flux to the outside of the
speaker box can be significantly reduced overall. It is desirable that the width of the shielding
plate 16 be substantially the same as or larger than the outermost diameter of the frame 12 as in
the embodiment. In the embodiment, the curved portions 15a and 15a of the shielding plate
15.15 are brought into contact with a part of the frame 12. However, the shielding plate 160 is
made wider and the curved portion is brought into contact with the entire periphery of the frame
12. May be Further, if the shielding plate 16 is extended to the back plate portion of the speaker
box 10, the leakage flux from the field section 11 can be shielded more efficiently. Of course, the
shielding plate 16 may be configured by one sheet instead of being divided into two as in the
embodiment. As described above, according to the present invention, a speaker unit having a
frame made of a magnetic material such as iron or the like is provided inside the speaker box so
that the inner surface of the baffle plate follows the inner surface of the side plate. Since the end
of the shielding plate is entrapped between the tip of the frame and the inner surface of the
baffle plate and attached to the inner surface of the baffle plate, only the leakage flux from the
field portion of the speaker unit Not only that, but also the leakage flux from the end of the frame
can be effectively shielded by the shielding plate. Furthermore, since the end of the shielding
plate is held between the front end of the frame and the inner surface of the baffle plate, the end
of the shielding plate is firmly fixed simultaneously with the attachment of the speaker unit.
For this reason, the mounting state of the shielding plate also becomes extremely stable.
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[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a conventional example, FIG. 2 is a perspective view showing the
main part of another conventional example, and FIGS. 3 and 4 are a perspective view and a front
view showing the main part of one embodiment of the present invention. It is.
10,,,, Speaker box, 10 a,,,, Baffle plate, 1 o b,,,,-, Side plate, 11 Q ,, ', Field part, 12,,,, Frame, 13
,,,,,,,,,,,,,,,,,,,,,, shield plate. Name of agent Attorney Nakao Toshio Other 1 person all figure
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