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JPS62107600

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DESCRIPTION JPS62107600
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
magnetic shield type speaker used for video equipment and the like. 2. Prior Art A conventional
magnetically shielded speaker is constructed as shown in FIG. That is, the ring-shaped upper
plate 4 is laminated on the plate 2 having the center 2 page 1 pole 1 similarly to the ring-shaped
magnet 3, and the ring-shaped cancel magnet 6 is coupled to the lower surface of the double
plate 2. The magnetic circuit 6 is constituted, the frame 7 is coupled to the upper surface of the
magnetic circuit 6, the peripheral edge of the diaphragm 9 is bonded to the peripheral edge of
the frame 70 together with the gasket 8 by bonding or the like. A voice coil 12 is held with its
middle part held by gumpers -10 and its lower part embedded in the magnetic gap 11 of the
magnetic circuit 6 without eccentricity, and a dust cap 13 is attached to the center of the upper
surface of the diaphragm 9 Was configured. In the above configuration, the cancel magnet 5
used is one magnetized in the opposite direction to the magnet 3 and is attached to the lower
surface of the plate 2 with an adhesive or the like using a jig or the like. Problems to be Solved by
the Invention In the magnetically shielded speaker of the above configuration, after the magnet 3
is magnetized, an adhesive is applied to affix a cancel magnet magnetized in the direction
opposite to the magnet 3 in three pages. It is necessary to fix them with a jig or the like before
being cured due to repulsion, which results in poor workability. SUMMARY OF THE INVENTION
The present invention is intended to eliminate the above-mentioned conventional drawbacks, and
it is an object of the present invention to provide a magnetic shield type speaker having a
configuration in which the cancellation magnet can be easily incorporated. Means of Solving the
Problems In order to solve the above-mentioned problems, the present invention laminates a
ring-shaped magnet and a ring-shaped upper plate on a plate having a center pole, and A frame
is connected to a magnetic circuit attached with a cancel magnet whose inner diameter is
positioned by a guide protrusion provided on the lower surface, and a voice coil which is
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embedded in the magnetic gap of the magnetic circuit at the center The peripheral portion of the
moving plate is connected. With the above-described configuration, the cancel magnet is
completely positioned with respect to the plate, and no jig or the like is required at the time of its
assembly, and even if the adhesive is uncured, the following steps can be performed. Work
becomes possible. The magnetic shield type loudspeaker according to an embodiment of the
present invention will be described with reference to FIGS. 1 and 2 in FIGS. 1 and 2. In FIGS. 1
and 2, reference numeral 14 denotes a magnetic circuit. The center pole 16 has a slide plate 16,
a ring-shaped magnet 17 disposed on the plate 16, a ring-shaped two-piece play 318 disposed on
the magnet 17, and the lower surface of the plate 16. The ring-shaped cancel magnet 20
magnetized in the opposite direction to the magnet 17 whose inner diameter is positioned on the
guide ridge 19 configured by providing a plurality of projections on the ring shape or a
circumference provided on the It is pasted with medicine and is constituted.
A frame 21 is connected to the upper surface of the magnetic circuit 14 on the 5th page of the
two-part plate 18 and the peripheral edge of the cone-shaped moving plate 23 together with the
gasket 22 is attached to the peripheral edge of the frame 21 by an adhesive. The upper part of
the voice coil 25 held by the damper 24 at its middle part is bonded to the central part of the
diaphragm 23, and the lower part of the voice coil 25 is eccentric to the magnetic gap 26 of the
magnetic circuit 14. It is embedded. Further, a dust cap 27 is attached to the central upper
surface of the diaphragm 23. In such a configuration, when an input signal is applied to the voice
coil 26, the voice coil 25 moves in a piston, and this movement or the diaphragm 23 is driven to
generate a sound according to the input signal. Become. Further, in the assembly of the magnetic
shielding type speaker, the magnet 17 and the upper plate 18 are incorporated on the plate 16
and adhesively bonded, and the frame 21, the gasket 22, the diaphragm 23, the voice coil 26 and
the like are incorporated therein to make a speaker unit The magnet 17 is magnetized, and the
cancel magnet 2o magnetized in the opposite direction to the magnet 6 penot 17 is completely
opposite to the same pole by using the guide ridges 19 of the plate 16 in the reverse step. It is
assembled by aligning and bonding with adhesives. At this time, since the magnetic pole of the
magnet 17 and the magnetic pole of the cancel magnet 2 o completely oppose each other
between N and S, and the centers of the guide ridges 19 of the plate 16 completely coincide with
each other, the repulsion between the magnets There is no displacement due to force, and the
cancellation magnet 20 does not cause positional displacement before curing of the adhesive,
and can be sent to the next step such as a drying step without being fixed by a jig or the like. As
described above, according to the magnetic shielding type speaker of the present invention, a
guide projection for positioning the inner diameter of the cancel magnet is provided on the lower
surface of the plate, and the insertion of the cancel magnet becomes extremely easy. It is possible
to make them face each other, and it is possible to cancel out the leaked bunch of magnets from
the magnet most effectively, and a significant improvement in quality will be achieved, which will
increase the practical value.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross sectional view showing an embodiment of the magnetic shielding type speaker of
the present invention, FIG. 2 is an enlarged cross sectional view of the main part, and FIG. 3 is a
cross sectional view of a conventional magnetic shielding type spill force.
14 ...... magnetic circuit, 16 ... center pole, 16 ... plate, 17 ..... magnet, 18 ...... top plate, 19 ... guide
collision 20 иии Gancel magnesol 1 и и и и и и и и и и и и и и и и и и diaphragm, 25 и и и voice coil. Name of
Agent Attorney Nakao Toshio and 1 other person Fig. 1 Fig. 2 Fig. 3 Procedure Amendment
November 17, 1986
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