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JPS63204998

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPS63204998
[0001]
FIELD OF THE INVENTION The present invention relates to an electromagnetic acoustic
transducer, in which adhesive strength is applied when the prepreg of the insulating plate is
heat-bleeded to the upper and lower surfaces of the insulating plate made of thermosetting resin
containing a fiber reinforcement. By securing terminal plates made of a yoke and a thin metal
plate, manufacturing and assembly is easy, mass production is possible, and an ultra-thin
electroacoustic transducer capable of surface mounting can be provided. is there. The
electromagnetic sound transducer of the prior art is used for sounding in small devices that
require high density mounting, such as various watches, cameras, portables, videos, tapes,
recorders or pagers, etc. Therefore, the demand for thinning is extremely strong. FIG. 6 is a front
sectional view of a conventional example of the electromagnetic acoustic transducer, in which the
coil 3 is attached to the pole 2 integrally erected substantially at the center of the yoke 1 and
near the outer periphery of the upper surface of the yoke 1 A ferrite magnet or a cylindrical
magnet 4 such as a plastic or magnet is disposed so as to surround the coil 3 and the pole 2 and
a circle facing the end face of the magnet 4 via the air gap G with the end face 21 of the pole 2 A
plate-shaped diaphragm 5 is mounted. On the lower surface side of the yoke 1, an insulating
pseudonym made of plastic or the like is adhered, and a pair of bin terminals 8 for connecting
the terminal 31 of the coil 3 to this insulating plate 6 are implanted. Problems to be Solved by
the Invention However, the above-described conventional electromagnetic acoustic transducer
also has the following problems. (A) When mounting on a device, as shown in FIG. 7, the
mounting 10.10 is provided in advance on the circuit board 9 on the device side, and the bin
terminal 7.8 is aligned with the hole 10.11. And must be inserted. However, the mounting is on
the lower surface side of the electroacoustic transducer and can not be seen from the upper side
of the electroacoustic transducer. Therefore, the alignment of the bin terminal 7.8 is difficult and
positional deviation is caused. In addition, the bin terminal 7.8 may bend, or extra work is
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required to correct the bend, and there is a problem that the mounting workability is poor. (,
Mouth) Since the bin terminal 7.8 is planted on the insulating plate 6, the bin terminal 7.8 may
be scratched or pulled out, and the reliability may be easily impaired. (C) There is also a problem
that a disconnection accident or the like of the coil terminal 31 is caused due to, for example, the
grazing or removal of the bin terminal 7.8. (D) If the thickness of the insulating plate 6 is
increased, it is possible to prevent, to a certain extent, the sticking and dropping of the bin
terminal 7.8. However, in this case, the overall thickness is increased, and thinning can not be
achieved.
Means for Solving the Problems In order to solve the above-mentioned conventional problems,
the present invention comprises a yoke, a pole provided upright on the upper surface of the
yoke, a coil mounted on the pole, and An electromagnetic sound comprising a magnet disposed
on the upper surface of the yoke so as to surround the pole and the coil, and a diaphragm
supported by the end face of the magnet and opposed to the tip end face of the pole via a gap In
the converter, a terminal plate made of the yoke and a metal thin plate by adhesion when the
prepreg of the insulating plate is heat-bleached on the upper surface and the lower surface of the
insulating plate made of a thermosetting resin containing a fiber reinforcement. Are each fixed.
Action Prepreg is a carbon fiber, glass fiber and other various reinforcing materials impregnated
with a thermosetting resin such as a phenol resin, unsaturated polyester resin, epoxy resin and
the like, and the curing is promoted to some extent (state B) 0 In this case, when the prepreg is
advanced from the B state to the C state (main curing), terminal plates made of a yoke and a
metal thin plate are fixed to the upper surface and the lower surface of the insulating plate,
respectively, by thermal adhesive during the heat breath. Accordingly, the step of fixing the yoke,
the insulating plate and the terminal plate can be a simple heat-bleeding step, the troublesome
adhesive application step can be omitted, the assembling step can be simplified, and the
thickness can be reduced. In addition, after the insulating plate is thermally cured to the C state,
high heat resistance can be obtained, so soldering by solder reflow becomes possible. Further,
since the terminal plate made of the yoke and the thin metal plate is fixed to the upper and lower
surfaces of the insulating plate, the structure on the lower surface side of the yoke is a laminated
structure of flat members of the insulating plate and the terminal plate. For this reason, the
whole thickness becomes thin. Furthermore, since the terminal plate made of a thin metal plate is
fixed to the lower surface of the insulating plate, unlike the conventional structure in which the
bin terminal is embedded, there is no room for the terminal plate to be scratched or pulled out.
Becomes possible. Further, the terminal plate can be a lead frame made of a thin metal plate, on
which the step of continuously fixing the yoke and the insulating plate with a thermal brace can
be taken, and the mass productivity can be enhanced. Embodiment 1 FIG. 1 is a cross-sectional
view of an electroacoustic transducer according to the present invention. In the figure, the same
reference numerals as in FIG. 6 indicate the same components. 14 is an insulating plate, and
15.16 is a terminal plate made of a thin metal plate such as phosphor bronze. The insulating
plate 14 is made of a thermosetting resin containing various fibrous reinforcing materials such
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as carbonized fibers and glass fibers, and the yoke 1 and the terminal plate 15.16 are fixed to the
upper and lower surfaces thereof.
In fixing the yoke 1 and the terminal plate 15.16 to the insulating plate 14, as shown in FIG. 2,
the terminal plate 15.16 is disposed on the support base 17, and the terminal plate 15.16 is The
insulating plate 14 in the B state of the prepreg is placed on top, the yoke 1 is placed on the
insulating plate 14, and heat and pressure are applied with a thermal brace 18. The insulating
plate 14 is changed from the B state of the prepreg to the C state by this heat-bleaching process,
and the yoke 1 and the terminal plate 15.16 are fixed to the upper and lower surfaces of the
insulating plate 14 by the adhesive force at this time. Accordingly, the fixing process of the yoke
1, the insulating plate 14 and the terminal plate 15.16 can be performed by a simple heatbleaching process, the troublesome adhesive application process can be omitted, the assembling
process becomes simple, and the thin type Can be After the insulating plate 14 is thermally cured
to the C state, high heat resistance can be obtained, so that soldering by solder reflow becomes
possible. Further, since the structure on the lower surface side of the yoke 1 is a laminated
structure of the flat plate members of the insulating plate 14 and the terminal plate 15.16, the
overall thickness is reduced. Furthermore, unlike the conventional structure in which the bin
terminal is implanted, the terminal plate 15.16 made of a thin metal plate is fixed to the lower
surface of the insulating plate 14 so that the terminal plate! While there is no room for the
occurrence of 5.16 gapping and removal, etc., the insulating plate 14 can be made thinner. In the
heat-bleeding step, as shown in FIG. 3, the terminal plate 15.16 is a lead frame made of a thin
metal plate, on which the step of continuously fixing the yoke 1 and the insulating plate 14 by
heat-bleeding is taken. Thus, mass productivity can be improved. The terminal end of the coil 3 is
conductively connected to the terminal plate 15.16. As conduction connection means in this case,
for example, conduction by through holes etc. can be considered. The free ends 151, 181 of the
terminal plate 15.16 are led out of the insulating plate 14 in opposite directions. With such a
structure, as shown in FIG. 4, the free end 151.161 of the terminal plate 15.16 is fixed on the
conductor 20.21 formed on one surface of the circuit board 29 by the solder 22.23. Also, since
surface mounting can be performed on the circuit board 20, the mounting which has
conventionally been required does not require the work of inserting and aligning the terminals
with respect to the holes, and the mounting work becomes easy. For soldering with solder 22.23,
solder reflow can be adopted for fixing, and mass productivity is improved. The magnet 4 is
formed of a plastic or a magnet. With a plastic or magnet, sufficient molding accuracy can be
ensured even when the size and thickness are reduced.
FIG. 5 shows another embodiment of the electroacoustic transducer according to the present
invention. A feature of this embodiment is that the free ends 151 and 161 of the terminal plates
15.16 are bent to have a spring property. With such a structure, in addition to the operation and
effect described in the embodiment of FIG. 1, the terminal plate 15.16 has its free end 151.1 [!
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The spring property of 1 offers the advantage of being able to be surface-mounted by pressing
on the conductor of the circuit board. As described above, according to the present invention, the
following effects can be obtained. (A) The step of fixing the yoke, insulating plate and terminal
plate can be performed by a simple heat-bleaching process, the troublesome adhesive application
step can be omitted, and a thin electromagnetic acoustic transducer with easy assembly can be
provided. . (B) It is possible to provide an electromagnetic acoustic transducer having high heat
resistance, capable of soldering by solder reflow, and having high mass productivity. (C) The
structure on the lower surface side of the yoke is a laminated structure of the flat plate members
of the insulating plate and the terminal plate, so that it is possible to provide a thin
electromagnetic acoustic transducer. (D) There is no room for the terminal plate to be scratched
or removed, and a highly reliable electromagnetic acoustic transducer capable of surface
mounting can be provided. (E) A terminal plate is used as a lead frame, and a step of continuously
fixing the yoke and the insulating plate with a thermal brace can be taken on the lead frame, and
an electromagnetic acoustic transducer with high mass productivity can be provided.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of an electroacoustic transducer according to the present
invention, FIG. 2 and FIG. 3 are views showing the manufacturing steps of the same, FIG. 4 is a
cross-sectional view showing an example of mounting similarly, FIG. FIG. 6 is a cross-sectional
view of another embodiment of the acoustic transducer according to FIG. 6, FIG. 6 is a crosssectional view of the conventional electroacoustic transducer, and FIG.
DESCRIPTION OF SYMBOLS 1 ... Yoke 2 ... Pole 3 ... Coil 4 ... Magnet 5 ... Diaphragm 14 ...
Insulating board 15.16 ... Terminal board FIG. 3 FIG. 6
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