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JPS54181926

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DESCRIPTION JPS54181926
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an
embodiment of the present invention, FIG. 2 is a leakage flux distribution diagram of the present
invention, and FIG. 3 is a conventional leakage flux distribution diagram of the same. . 1 ...... 7L / beam, 1a ...... outer periphery, 4 ...... shield plate.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic shield
type speaker mounted in a cabinet such as a television receiver, in particular, to prevent leakage
magnetic flux and eliminate negative effects such as image distortion. In the past, for example, a
speaker incorporated in the cabinet of a television receiver was often attached near the proximity
body 11) of the cathode ray tube itself. Therefore, the magnetic field from the magnetic circuit
causes the disturbance of the image of the Braun tube. In particular, when a magnetic body such
as an iron plate is used for the frame of the speaker, the leakage magnetic flux at the outer
peripheral portion of the frame tends to be concentrated and tends to be large as shown in FIG.
The whale was also big. As a conventional method of reducing the leakage magnetic flux as
described above, there has been a structure in which a nonmagnetic material is used as a
material of the frame 16 'or a magnetic circuit is surrounded by a frame for shielding. However,
this conventional product has the disadvantages that the cost is high and the structure is
complicated. The present horseshoe is a book made in view of the above-mentioned point, so the
place where it is intended is a shield plate in which the outer peripheral edge portion of the
speaker frame formed of magnetic material 1> such as iron plate is formed of high magnetic
permeability material It is to provide a magnetic shield type speaker which prevents magnetic
flux leakage from the frame by being closed at the same time, has a low cost and has a simple
structure and has an aesthetic sense in the shield plate itself. . Hereinafter, the details of one
embodiment of the present invention will be described with reference to the attached drawings. A
speaker frame 1 is formed of a magnetic material such as an iron plate, and the outer peripheral
edge 1 m thereof is fixed to the baffle plate 2 of the cabinet. 3 is the outer peripheral edge of the
12-05-2019
1
edge 3 & the step 1bK [! ! The fixed diaphragm 4 is a shield plate made of a high magnetic
permeability material such as permalloy. This shield plate 4 is a cabinet by closing the edge
portion 1a with the outer periphery of the frame 1 via the backing S. Attach to 5 is a magnetic
circuit, 6 is a magnet constituting the magnetic circuit 5, T is a plate, 8 is a ball, 9 is a coil bobbin
12 inserted in an annular magnetic gap 11 formed between the ball 8 and the plate 10 The coil
bobbin 12 is fixed to the diaphragm 3 with a voice coil to be inserted. A damper 13 supports the
diaphragm 3 and the voice coil bobbin 12. In one embodiment of the present invention, the outer
peripheral portion 1a of the frame 1 is made of permalloy or the like even if the frame 1 itself is
formed of a magnetic material such as iron. Since the shield plate 4 is closed by the shield plate 4
formed of a high-rate material, the shield plate 4 shields the leakage flux which tends to be
concentrated from the magnetic circuit 5 through the frame 1). It can be reduced as shown in the
leakage flux density distribution shown in FIG.
Therefore, even if a speaker is disposed in the vicinity of a cathode ray tube (not shown) in a
cabinet such as a television receiver, the leakage flux generated from the outer peripheral edge 1
& of the frame 1 is closed by the shield plate 4 Therefore, the image of the CRT is not disturbed.
As described above, according to the present invention, the magnetic flux leakage from the frame
is prevented by closing the shield with a shield plate formed of a magnetic material such as an
iron plate, and the cost is a warehouse and the structure is simplified. The board itself has effects
such as having an aesthetic sense. 4. Brief description of the surface] l Fig. 1 is a longitudinal
cross-sectional view showing an embodiment of the present invention, Fig. 2 is a leakage flux
distribution diagram of the present invention, and Fig. 3 is a conventional leakage flux
distribution diagram. It is. 1 ......... frame 11L · · · · · · outer peripheral edge portion 4 ......... shield
plate fruit [[1? ta * Pioneer Co., Ltd. applicant i) Agent Hideo Hideo '-? Sawa 4 Woman, i Fig.
451a 1765 Fig. 2 111% 5G 181926 Utility Model Applicant Applicant Pioneer Hideo Kanno
12-05-2019
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