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DESCRIPTION JPH0262195

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DESCRIPTION JPH0262195
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
low-leakage flux type speaker used for various audio and visual devices. 2. Prior Art A
conventional low-leakage flux speaker of this type has a configuration as shown in FIG. That is, a
diaphragm is formed on a frame outer peripheral portion of a housing 6 configured by integrally
molding a magnetic circuit configured by sandwiching the main magnet 1 by the upper plate 2
and the lower plate 3 with the frame 4 and molding by resin. The voice coil 7 for driving the
diaphragm 6 is bonded by centering the bobbin with the damper 8 so as to fit in the magnetic
gap 9, and the diaphragm 6 is connected to the voice coil 7 The dust cap 10 is adhered to the
surface of the part to constitute a speaker body. Then, shield cover 11 and cancel magnet 12 are
bonded in another process, the above speaker main body and this cancel magnet assembly are
separately magnetized in opposite directions separately, and both are bonded to assemble as a
low leakage speaker Further, a seal such as a product part number is pressed on the back surface
of the shield cover 11 to complete the process. SUMMARY OF THE INVENTION However, in the
conventional low-leakage flux type speaker of this type, at the time of its assembly, after
assembling the speaker main body, the shield cover 11 and the cancel magnetoso 12 are bonded
in a separate process, There is a problem that the process takes a very large number of steps,
such as adhesion of the product to the main body. In addition, even after the product is
completed, abnormal noise is generated due to resonance during the operation test between the
resin frame main body molding the magnetic circuit and the shield cover 11 due to the structure,
and many defective operation products occur. Had a major quality problem of The present
invention solves such conventional problems, and provides a low-leakage flux speaker having a
streamlined assembly process and a very stable quality. Means for Solving the Problems In order
to solve the above problems, the present invention provides a shield provided with a hole on the
back surface portion into which a cancel magnet can be inserted in a later step at the time of
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molding the magnetic circuit as a housing with a frame. The cover is molded at the same time as
the magnetic circuit. With the above-described configuration, the shield cover is also integrally
molded in the speaker body portion in the two steps of the step of bonding the conventional
shield cover and the cancel magnet and the step of bonding the assembly to the speaker body
Therefore, the process of bonding the cancellation magnet to the speaker main body is only one
step, and furthermore, since the shield cover is integrally molded and generation of abnormal
noise due to resonance is also not suspended due to its structure, the quality is extremely high Be
stable.
Embodiment Hereinafter, a low leakage flux speaker according to an embodiment of the present
invention will be described with reference to the drawings. As shown in FIG. 1, a magnetic circuit
33 constructed by sandwiching the main magnet 21 between the upper plate 22 and the lower
plate 23 and a shield for leakage of the leakage flux generated from the magnetic circuit 33 to
the outside At the same time as the frame 24, a shield cover 31 made of a magnetic material
such as an iron plate is molded by resin to form a housing 25. At this time, a hole 34 is provided
at the center so that the cancel magnet can be attached to the rear surface of the lower plate
later. Then, a diaphragm 26 is adhered to the outer peripheral portion of the frame 24 of the
housing 26, and a voice coil 27 for driving the diaphragm 26 is centered by the damper 28 and
fitted in the magnetic gap 29. The dust cap 30 is bonded to the surface of the connecting portion
of the diaphragm 26 and the voice coil 27 to form a speaker body. Further, the speaker main
body is magnetized, and a cancel magnet 32 magnetized in the opposite direction is bonded in a
separate step to complete the low leakage flux type speaker. In addition, the product product
number etc., which is normally displayed by the seal on the back surface of the shield cover 31,
is simultaneously molded as the case 26 having the frame 24 with the magnetic circuit 33 and
the shield cover 31 when forming the case. Sometimes, the back surface of the housing 26 is
indicated by a molded character engraved in a mold 0 where the magnetic circuit 33 is molded
as a structure with a frame 24 as a feature in this embodiment At the same time, since the shield
cover 31 is also molded and molded, in the case of the conventional method, after assembling the
speaker body, the shield cover and the cancel magnet are adhered in a separate step, In this
embodiment, the cancel magnet 32 is in contact with the speaker main body in this embodiment,
although it takes a great deal of the production process of bonding to the main body. Off such
that it requires only a very simple process that only can be achieved on the production process
large rationalization. Further, in the case of the prior art, since the resin cover of the shield cover
31 and the magnetic circuit 33 is only attached so as to cover the outside from the outside
during the operation test after the speaker is completed, Although an abnormal sound is
generated due to resonance between a portion of the shield cover and defective products occur
frequently, according to this embodiment, since the entire outer periphery of the shield cover 31
is covered with resin, its structure It is possible to supply a speaker that is extremely stable in
quality without any generation of the upper resonance sound.
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In addition, as a secondary feature, what has conventionally been indicated by the product
number or the like of the product by a seal can be displayed by imprinting on the back surface of
the cis beaker by a formed character engraved in a mold according to the present embodiment
Therefore, it is possible to reduce the sealing process. Furthermore, the shield cover 31 in the
present embodiment is sized from the top plate 22 to the main magnet 21. Since the lower plate
23 and even the cancel magnet 32 are shaped so as to completely cover except for the portion of
the hole 34 which makes it possible to insert the cancel magnet 32 later, the leakage flux is
reduced. It is a very effective shape for shielding. As described above, according to the present
invention, since the shield cover is integrally molded with the external magnet type magnetic
circuit including the main magnet, the upper and lower plates, and the frame as a frame, the
speaker The industrial value is extremely large because a very stable product can be provided in
which the production process can be greatly rationalized and, in terms of quality as well, the
abnormal sound due to resonance due to its structure can be supplied.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a low leakage magnetic flux speaker according to an
embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional resin
mold type low leakage magnetic flux speaker.
21 и и и и и и Main magnet, 22 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и resin frame. 25
иииииииииииииииииииииииииииииии Dia. и и и Canceling magnet, 33 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и magnetic circuit, 34 и и и и и и. Name of Agent Attorney Shigenori Ogino is one person 2/1-one
master Mc Hun 22-L Department board? 3 ░ to lower tray Y 24-frame 25-case z 6--bowl gravity
plate 27-whistle coil 2 q-?-sulfur gas Figure 2-33-? ?.
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