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JPS55179496

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS55179496
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a conventional speaker,
FIG. 2 is an enlarged view of a part thereof, and FIG. 3 is a sectional view of an essential part of a
speaker according to an embodiment of the present invention. 5 --- Moving coil, 11 --- Electrode
plate.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker with
increased life and reliability. In recent years, along with the development of radios and audio
equipment, speakers are often used in places with lots of dust and dust, including cars with an
eyelid. Naturally, magnetic materials are also included in stiffness and wishes. It is well known
that such a minute particle of Hiko magnetic substance intrudes into the magnetic circuit of the
speaker to cause an abnormality in the operation of the speaker. -If FIG. 1 is demonstrated to an
example, 1 will be ring-shaped pole plate 1, i! 2 is an electrode plate which doubles as a center
pole, 3 is a magnet, 41 is a coil bobbin, 6 is a moving coil, 6 is a / 7 de / 9/1 unit 1 UmtH1ii, 81;
1: frame, 49 ports Are the gaps between the moving coil 6 and the plates 1, 2 respectively. Here,
the magnetic particles in the air first adhere to the damper 6, pass through the damper 6 and are
promoted by the vibration generated by the diaphragm 7 and enter the gap 9 of the moving coil
6 having a stronger magnetic field. Numeral 10 is a fragment thereof, which is concentrated on
the strong portion of the magnetic field in the gap 9 (the corner portion on the magnet 3 side of
the electrode plate 1), which causes the piston movement of the moving coil 6 to be disturbed. As
a result, the operation of the speaker will be abnormal. The present invention has been made in
view of this point, and is intended to structurally escape even if magnetic fine particles intrude,
and to keep the use time until occurrence of abnormality as long as possible. . FIG. 3 shows an
embodiment thereof, in which 2, 3 and 5 are the same as those of the same reference numerals
in FIG. 1, but the electrode plate 11 corresponding to 1 in FIG. A portion corresponding to the
Muprano '-ping coil 6 is made R-shaped (prior art-as shown by a dotted line as a dotted line), and
from the relationship of flowing magnetic flux etc., the magnetic material piece 1o is attached to
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this portion Also, there is no problem in moving the piston of the moving coil 5. That is, as shown
in FIG. 3, even if the magnetic material fragments 10 are attached, the usage time until the
occurrence of an abnormality can be made as long as possible. Therefore, a part of the electrode
plate 11 with an operation such as taking 10,000 Paris that the life of the speaker is enhanced.
There is no burden from the man-hours because it is only necessary to carry out the irR sword I
work. As apparent from the above embodiments, according to the present invention, it is possible
to cleverly remove the effects of mixed fine particles, '! In addition, its structure is simple and
practical effects are large.
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