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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 structure as shown in FIG. That is, the
magnetic circuit 4 configured by sandwiching the main magnet 1 by the upper plate 2 and the
lower plate 3 is integrated, and the diaphragm 6 is bonded to the peripheral portion of the frame
6 configured by resin molding. The voice coil 7 for driving the diaphragm 6 is center-held by the
damper 8 at the middle portion thereof and coupled so as to fit into the magnetic gap 9, and the
surface of the coupling portion of the diaphragm 6 with the voice coil 7 The dust cap 10 is
bonded to the speaker body to constitute a speaker body. Then, the shield cover 11 and the
cancel magnet 12 are bonded in another process, and the speaker body and the cancel magnet
assembly are separately magnetized in opposite directions to each other, and both are bonded to
achieve low leakage. Assembling was carried out as a magnetic flux type speaker, and
furthermore, a seal such as a product part number was stamped on the back surface portion of
the shield cover 11 to complete the assembly. SUMMARY OF THE INVENTION However, in the
conventional low-leakage flux type speaker of this type, the shield cover 11 and the cancel
magnet 12 are bonded in a separate step after assembling the speaker main body at the time of
its assembly. Furthermore, it had the problem that it took a lot of processes, such as adhering to
the main body. Also, even after the product is completed, due to its structure, abnormal noise is
generated due to resonance during the operation test between the frame 5 molding the magnetic
circuit 4 and the shield cover 11, and many defective operation products occur. Had a major
quality problem. The present invention solves such conventional problems, and provides a lowleakage flux speaker having a streamlined assembly process and a very stable quality. Means for
Solving the Problems In order to solve the above problems, according to the present invention,
the main magnet and the cancel magnet are magnetized in advance when the magnetic circuit is
molded, and the upper and lower plates repel each other. And the shield cover as well as the
shield cover. With the above configuration, the cancel magnet and the shield cover are integrated
into the speaker main body in two steps of bonding the conventional shield cover and the cancel
magnet, and bonding the assembly to the speaker main body. This can be omitted because it is
molded, and furthermore, since the shield cover is integrally molded and the occurrence of
abnormal noise due to resonance also does not occur, the quality is extremely stable.
Furthermore, since there is no adhesive layer between the lower plate and the cancel magnet,
and the cancel magnet and the shield cover, the magnetic resistance is small, which is very
advantageous for improving the performance of low leakage. 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, the magnetic circuit 33 constructed by
sandwiching the main magnet 21 magnetized in advance by the upper plate 22 and the lower
grate 23 and the leakage flux generated from the magnetic circuit 33 are leaked to the outside.
In order to prevent this, the cancel magnet 32 positioned so that the magnetization direction is
opposite to that of the main magnet 21 and the shield cover 31 made of a magnetic metal body
such as an iron plate are simultaneously The body 26 is composed. Then, a diaphragm 26 is
adhered to the peripheral edge of the frame 24 of the housing 25, and the voice coil 27 for
driving the diaphragm 2 e is centrally held at its intermediate part by a dunno <-28. The dust cap
3o is bonded to the surface of the connecting portion of the diaphragm 26 with the voice coil 2R.
Further, the product product number or the like which is usually displayed by a seal on the back
surface of the shield cover 31 is displayed on the back surface of the case 26 by molding
characters carved in a mold. Here, as a feature in this embodiment, at the time of molding the
magnetic circuit 33 as a structure with the frame 24, since the mold including the cancel magnet
32 and the shield cover 731 is simultaneously molded, the conventional method is used. If the
speaker main body is assembled, the shield cover 31 and the cancel magnet 32 are bonded in a
separate process, and this assembly is further adhered to the main body, but it is possible to omit
all of the processes that took a great deal. , Can be greatly rationalized in the production process.
Furthermore, in the case of the prior art, since the shield cover 31 is merely attached so as to
cover the resin mold portion of the magnetic circuit 33 from the outside at the time of the
operation test after the speaker is completed, Although an abnormal sound is generated between
the shield cover 31 due to resonance and defective products occur frequently, according to the
present 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 resonance noise. Also, since there is no layer of adhesive between the lower
plate 23 and the cancel magnet 32, the cancel magnet 32 and the shield cover 31, the magnetic
resistance of that portion is very small, and the magnetic circuit is efficient. Therefore, the
performance for low leakage is also very advantageous.
Then, as a secondary feature, although the product number or the like has conventionally been
indicated by a seal, according to the present embodiment, it can be indicated by imprinting on
the back of the speaker by molding characters engraved in a mold. Therefore, it is possible to
reduce the sealing process. As described above, according to the present invention, since the
cancel magnet and the shield cover are integrally molded with the magnetic circuit constituted by
the main magnet and the upper and lower plates as a frame-attached housing, The industrial
value is extremely high since it is possible to supply a very stable product in which the
production process can be greatly rationalized, and in terms of quality the abnormal sound due
to the resonance does not occur.
Brief description of the drawings
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 · · · Main magnet, 22 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · resin frame, 25 · · · · · · · · 2θ · · · ·
· · · · diaphragm · 27 · · · · · · voice coil, 28 · · · · · · · · · · · · · · · · · · magnetic gap, 3 o · · · · · · · dust cap,
31 ...... shield cover, 32 ...... cancel magnet, 33 ...... magnetic circuit. Name of Agent Attorney
Attorney Shigetaka Takano Other 1 3 3
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jph02268598, description
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