JPS62265898

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DESCRIPTION JPS62265898
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for various audio devices and video devices. Prior Art A conventional loudspeaker
of this type is configured as shown in FIG. That is, the leakage flux of the main magnet 3 is
applied to the back surface of the lower plate 2 of the magnetic circuit constructed by
incorporating the ring-shaped main magnet soto 3 and the ring-shaped upper plate 4 on the
lower plate 2 having the center ball 1. To cancel the magnetizing direction, the cancel magnet 6
is bonded in the opposite direction, and the frame end is connected to the top plate 4 of the field
section 6 where the anti-magnetic measures are taken. The voice coil 11 is bonded to the central
portion of the diaphragm 9 without being eccentric to the magnetic gap 10 formed in the field
section 6 without being eccentrically attached, and the bobbin middle portion of the voice coil 11
is And the dust cap 13 is incorporated on the upper surface of the central portion of the
diaphragm 9. Here, in order to reduce the leakage flux to the outside of the main magnet 3, the
characteristic of the conventional speaker of this type is to magnetize the back surface of the
lower plate 2 of the field section 6 in the opposite direction to the main magnenode 3 It adheres
to the main magnetic magnet 3 in the direction of repulsion to the main magnetic metal 3 and
normally shorts the magnetic magnetic head V 6 and the upper plate 4 to form a magnetic
circuit, and also functions to shield the leakage flux. The result is that the shield cover which has
been achieved is omitted for cost reduction. Problems to be solved by the invention In such a
conventional configuration, since the magnetizing direction of the main magnet 3 and the cancel
magnet 7) 5 is adhered in the opposite direction, they are separately magnetized and adhered.
However, after the magnetization of the cancel magnetic node 6 is completely magnetized, the
magnetization direction can not be determined at all in appearance, and when bonding to the
lower plate 2 of the speaker, the bonding direction is incorrect with the adhesion direction fixed.
The adhesive is not cured immediately after bonding, so the cancel magnet 6 is displaced from
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the lower plate 2 due to the repulsion of the magnetic force of the main magnet 3 and the cancel
magnet 6, and it is eccentric. Bonding as it is (there are two major quality problems that lead to a
decrease in bonding reliability due to a reduction in the bonding area between the two). Means
for Solving the Problems To solve this problem, the present invention does not adhere the lower
plate and the canceled Magnes Soto as it is, but sandwiches the magnetic metal body between
them and lowers the magnetic metal body. It is considered to be connected to
Since the magnetic metal body is already adhered to the cancel magnet before the magnetization
is performed when the cancel magnet is joined to the lower plate by this configuration, the
adhesion of the magnetic metal body is performed. It is possible to visually judge the direction in
which it is being used, and therefore it is possible to couple the cancel magnet to the back of the
lower plate without making a mistake in its magnetization direction, and between adhesion and
curing of the adhesive. Since screwing is performed as a configuration in which the magnetic
metal body in which the cancel magnet is adhered to the screw hole at the bottom portion of the
center guide hole of the lower plate is tightened, it is possible to prevent the adhesion deviation
caused by the repulsive magnetic force of both. Embodiment 1 FIG. 1 shows an embodiment of
the present invention. A field portion 18 incorporating a ring-shaped main magnet 16 and a ringshaped upper plate 17 on a lower plate 15 having a center pole 14. The frame 19 is coupled onto
the field portion 18, the peripheral edge of the diaphragm 21 is coupled to the circumferential
edge of the frame 19 together with the gasket 20, and the voice coil 22 is coupled to the central
portion of the diaphragm 21. The lower part of the voice coil 22 is fitted into the magnetic gap
24 of the field part 18 without eccentricity by holding the middle part of the voice coil 22 by the
damper 23, and the dust cap is attached to the upper surface of the central part of the diaphragm
21. It sticks 26 and constitutes a general speaker. Then, a screw hole 26 is provided at the center
of the lower plate 16 of the field section 18, and a cap-like magnetic metal such as iron is
adhered to the main magnet 16 and a cancel magnet 27 whose magnetization direction is
opposite to that 28 is configured to be connected by a mounting screw 29. That is, the
loudspeaker according to the present invention comprises a magnetic metal body 28 serving as a
mark in the direction of magnetization and a function to prevent adhesion deviation due to
magnetic repulsion on the back surface of the lower plate 16 of a conventional external magnet
type speaker. The cancel magnet 27 and the lower plate 15 are coupled by tightening the
mounting screw 29 so as to clamp the magnetic metal body 28 in the screw hole 26 cut in the
center guide hole bottom portion at the back center. Here, the roles of the magnetic metal body
28 and the mounting screw 29 will be described. First, in the process, assembly of the external
magnet type speaker and adhesion of the cancel magnet 27 and the magnetic metal body 28 are
separately performed in parallel. Magnetize all. ここでキャンセルマグネ？ Since the direction in
which the magnetic metal body 28 is adhered is used as a mark when magnetizing in 27), the
magnetizing direction can be easily determined from the appearance.
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When both magnetizing processes are completed, an assembly of the cancel magnet 27 and the
magnetic metal body 28 is provided in the center of the magnetic metal body 28 in the screw
hole 26 cut in the bottom of the center guide hole of the lower plate 16 of the speaker. The
mounting screw 29 has a configuration in which the magnetic metal body 28 is tightened in the
through hole, and both of the repelling force caused by the opposite magnetic force direction of
the main magnet 16 and the cancel magnet 270 of the speaker This is a magnetic-shielded
speaker configured to be bonded while preventing misalignment. Further, as shown in FIG. 2, a
hole is provided at the center of the lower surface of the lower plate 16 with a connecting
protrusion 30 and at the center of the magnetic metal body 28 in which the cancel magnet 27 is
adhered to the connecting protrusion 30. , And may be joined by forming a head 31 by
performing a high-spin process to crush the tip of the connecting projection 30. Further, as
shown in FIG. 3, a conical guide hole 32 is provided at the center of the lower surface of the
lower plate 16, and the center of the magnetic metal body 28 such as a flat plate iron is adhered
in advance. It is also possible to provide a conical guide projection 33, which is positioned to fit
into the guide hole 32 and bonded by bonding or welding. As described above, according to the
present invention, after attaching a magnetic metal body to a cancel magnet and magnetizing it
as a mark in the magnetization direction, screw holes are cut in the bottom of the center guide
hole of the lower plate. Since it is configured to be screwed and coupled, the magnetic metal
body is adhered to one surface of the cancel magnet from the time it is magnetized to the cancel
magnet until it is screwed to the back surface of the lower plate. Therefore, the magnetizing
direction can be easily determined on the appearance so that the adhesive direction can be
adhered without mistake, and if it is the conventional method, the main magne I will be cured
until the adhesive is cured. (3) The two members, which were living together due to the repulsion
of the magnetic force of the cancellation magnet and the cancellation magnet, are completely
eliminated by screwing. The direction of adhesion of the gnet to the lower plate is not mistaken,
the reliability in the direction of magnetization is significantly improved, and the adhesive
displacement of the speaker and the cancel magnet is also eliminated, and the appearance quality
is improved and the adhesive displacement is accompanied. Since the reduction of the lower
plate and the cancel magne / tono adhesion area is also eliminated, the quality reliability in the
adhesion can be made very stable, and the industrial value is very good for dogs.
FIG. 2 is a cross-sectional view of a conventional speaker. 14 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · top plate, 18 · · · · · · field
Portions 19 · · · · · · · · · · · · · · · · · · · · · · · · voice coil, 24 · · · magnetic gear · · · · · · · · · · Screw holes,
27: Cancel magnet, 28: Magnetic metal, 29: Mounting screw. Name of agent Attorney Nakao
Toshio Other 1 person Figure 3 ど Figure 4
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