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DESCRIPTION JPH0379200

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DESCRIPTION JPH0379200
[0001]
TECHNICAL FIELD The present invention relates to a speaker used for various audio equipment
and video equipment. 2. Prior Art A conventional loudspeaker of this type is configured as shown
in FIG. That is, the diaphragm 6 is formed on the peripheral portion of the frame 5 configured by
integrating the magnetic circuit 4 configured by sandwiching the magnet 1 by the upper plate
and the lower plate 3 and insert molding only with one type of resin. Bonding, voice coil for
driving this vibration plate 6 V7 is held at its center by damper 8 so as to fit in the magnetic gap
9 and the vibration coil 6 is connected to the voice coil 7 The dust cap 1 o was adhered to the
surface of SUMMARY OF THE INVENTION However, in the conventional speaker of this type,
particularly in the case of a high input resistance type speaker, the resin in which the magnetic
circuit 4 is insert-molded and integrally molded with the frame 5 is heat resistant to improve its
reliability. When using a resin that has excellent resin properties, speakers using such a resin
have excellent heat resistance of the resin when assembling the diaphragm 6 and the damper 8
by welding to the frame 6 Because of this, ultrasonic welding and thermal welding are very
difficult, and sometimes there is a major quality problem such as adhesion failure. The present
invention provides a speaker using a resin frame of a high input resistance type having a very
high reliability against welding and having a magnetic circuit insert molding type, which solves
such conventional problems. It is. Means for Solving the Problems In order to solve the above
problems, the present invention uses a resin material suitable for ultrasonic welding and thermal
welding of the entire frame portion except the magnetic circuit insert portion or only the
diaphragm bonding surface and the damper bonding surface. The other part is made of a resin
material extremely excellent in heat resistance, and is formed by two-color molding of the
magnetic circuit insert part and the frame part in an integrated manner. Although the magnetic
circuit insert portion is not suitable for welding by the above configuration, the heat generation
of the voice coil is conducted to the resin insert portion through the magnetic circuit because the
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magnetic circuit insert portion is made of resin having excellent heat resistance. Even if it has
excellent heat resistance, there is no problem such as heat deformation and heat dissolution, and
furthermore, in the diaphragm adhesion part and the damper adhesion part of the frame,
although it is inferior to heat resistance, it is extremely against welding. Since it is made of an
excellent resin, productivity for welding is improved, and quality problems such as peeling of the
frame and the diaphragm, and the frame and the damper do not occur.
Embodiment A speaker using a magnetic circuit insert type resin frame according to an
embodiment of the present invention will be described with reference to the drawings. As shown
in FIG. 1, a heat-resistant resin material, such as PBT, for covering and holding the magnetic
circuit 24 formed by sandwiching the magnet 21 between the upper plate 22 and the lower plate
23 is covered. (Polybutylene terephthalate), PET (polyethylene terephthalate), a magnetic circuit
holding portion 252L made of thermosetting resin or the like, and a diaphragm adhesion surface
312L and a damper adhesion surface 31b suitable for ultrasonic welding or heat welding A
frame portion 25b made of a material, for example, ps (polystyrene) or mu BS (acrylonitrile
butadiene styrene) is integrally molded in two colors to obtain a magnetic circuit mounted body
32. Then, the diaphragm 26 is welded to the diaphragm adhesion surface 31 & of the peripheral
portion of the frame portion 25b of the magnetic circuit attachment 32, and the voice coil 27 for
driving the diaphragm 2e is used as an intermediate portion of the frame portion 25b. The
damper is bonded to the damper bonding surface 31b and held in a central position by means of
the damper 28 so as to be fitted into the magnetic gap 29 and the dust cap 30 is adhered to the
surface of the connecting portion of the diaphragm 26 with the voice coil Iv 27 . By doing this,
the diaphragm 26 and the damper 28 are welded to the respective adhesive surfaces 31 & 31b
of the frame portion 25b made of a resin material suitable for welding, so that the production
efficiency at the time of welding is improved, In addition, quality problems such as peeling
occurring after welding do not occur. Effect of the Invention As described above, according to the
present invention, since the resin having excellent heat resistance is used except for the portion
where the resin frame added body in which the magnetic circuit is insert-molded is welded, the
reliability against heat can be improved. The portion to be welded, ie, the diaphragm bonding
surface and the damper bonding portion, are formed by two-color molding with a resin suitable
for welding, so that the production efficiency at the time of welding is improved, and even after
welding High quality, high reliability, and high productivity can be realized with a speaker of high
input resistance type because quality problems such as peeling do not occur, and its industrial
value is extremely large.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a cross-sectional view of a speaker using a resin frame of a magnetic circuit insert
molding type according to an embodiment of the present invention, and FIG. 2 is a crosssectional view of a speaker using a resin frame of a conventional magnetic circuit insert molding
type. .
21 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
magnetic circuit, 262L · · · · · · · · , 26b · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · magnetic gap, 30 · · · ......
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