JPS5899099

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DESCRIPTION JPS5899099
[0001]
The present invention relates to a method of manufacturing a diaphragm unit such as an
electromagnetic acoustic transducer for use in a hearing aid, and it is possible to simultaneously
fix a metal frame henoresin film and fix it to a resin film in a short time. A manufacturing method
of a diaphragm unit is provided. The diaphragm unit of an electromagnetic acoustic transducer
used for a hearing aid or the like holds the resin film 14 on the -L surface of the frame 13 and
fixes the diaphragm 16 to the resin film 14 as shown in FIG. By doing this, the diaphragm 15 has
a structure that facilitates piston movement. Conventionally, this type of diaphragm unit is
manufactured by first bonding the diaphragm 16 onto the resin film 14 with an adhesive, and
then bonding the resin film 14 to the frame 13 with an adhesive. However, the above-mentioned
conventional manufacturing method has a drawback that the number of steps is large and the
quality is not stable, the weight increases because the adhesive is used, and the stiffness is
increased due to the protrusion of the adhesive. . The present invention eliminates the abovementioned conventional drawbacks, and the structure of an electromagnetic acoustic transducer
proposed by the present inventor will be described with reference to the drawings. In FIGS. 2 to
6, 1 is a rectangular case whose upper surface is open, and the case 1 is made of a magnetic
material. Reference numerals 2 and 2 denote holes formed on one side of the case 1. A lid 3
covers the top opening of the case 1 and a notch 4 is formed on one side of the lid 3. The lid 3
and the case 1 constitute a rectangular container. Reference numeral 6 denotes a plate-like
member formed by bending a metal plate. The plate-like member 5 includes a substrate 6 and
side plates 7 and 7 'extending in parallel from both ends of the substrate 6; It consists of an
armature 8 which extends between the central portion of the base plate 6 and the side plate 7 °
7. 9 is a small hole formed in the armature 8; The coil 10 is a coil, and the coil 10 is adhered to
the inner surface of the side plate portions 7 of the plate-like member 5. Armature 8 penetrates
the central hole of coil 1 o without contacting coil 10. Reference numeral 11 denotes a
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rectangular cylindrical yoke made of a magnetic material, and plate-like magnets 12.12 'are fixed
to opposing surfaces inside the yoke 11, respectively. The inner surfaces of the end portions of
the side plate portions 7 and 7 'of the plate-like member 5 and the both side surfaces of the yoke
11 are fixed by spot welding and bonding to form a drive unit A) (FIG. 6). In the state where the
plate-like member 5 and the yoke 11 are fixed, the end of the armature 8 is inserted between the
magnes 12.12 so as not to contact with the mages 12.12.
The lower surface of the yoke 11 of the drive unit unit is fixed to the bottom surface in the case
1. Reference numeral 13 denotes a frame, and on the upper edge of the frame 13, a vibrating
film 14 made of a thermoplastic resin film is heat-sealed. A diaphragm 15 is fixed to the lower
surface of the diaphragm 14 by heat fusion, and the diaphragm 15 is formed of a light metal
plate such as Al or mini ram. The reference numeral 16 denotes a small hole formed in the
diaphragm 15. Said frame 13. Vibrating membrane 14. A diaphragm unit B (FIG. 5) is configured
by the diaphragm 16. The diaphragm unit is fixed to the upper surface of the yoke 11 of the
drive unit unit. One end of the drive pin 17 is inserted into the small hole 9 of the armature 8
and the adhesive 1 is fixed by spot welding or the like, and the other end of the necked drive pin
17 is the vibration. It is inserted into the small hole 16 of the plate 15 and fixed. Reference
numeral 18 denotes a sound hole fixed to the side surfaces of the case 1 and the cover 3 so as to
cover the notch 4 of the cover 3; 19 denotes a terminal plate fixed to the other side of the case 1;
Are respectively connected to the terminal-plate 19 through the holes 2.degree. Next, the
operation of the above embodiment will be described. 'A magnetic circuit is constituted by the
magnet 12.12' and the yoke 11, and a DC magnetic field is generated between the magnet 12.12.
Here, when a signal is applied to the coil 1 o, an alternating magnetic flux is generated, and this
alternating magnetic flux is transmitted to the armature 8. The alternating current magnetic field
is generated between the magnet 12.12 and the armature 8 through the magnetic circuit
composed of the magnets 12, 12, the side plate portions 7, 7 of the yoke 11 member 6, and the
substrate portion 6 of the member 5, and this alternating current magnetic field As a result of
being superimposed on the armature 8, the armature 8 vibrates. The vibration of the armature 8
is transmitted to the diaphragm 16 via the drive pin 17, and the diaphragm 16 vibrates and a
sound wave is emitted. This sound wave reaches the ear through the notch 4 of the lid 3 and the
sound hole pipe 18 and further through the ear tip (not shown). The present invention relates to
a method of manufacturing a diaphragm unit for use in a transducer such as the abovementioned electromagnetic acoustic transducer, and one embodiment of the present invention
will be described below with reference to FIGS. In FIG. 6, 2o is a jig in which a heater is
incorporated, and a protrusion 21 is formed on the upper surface of the jig 2o. Reference
numeral 22 is a groove formed on the upper surface of the projection 21. As shown in FIG. 7, the
frame 13 is fitted to the side portion of the projection 21 and the diaphragm 15 is inserted into
the groove 22.
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Said frame 13. The diaphragm 16 is heated by the heated jig 20. Frame 13. When the diaphragm
16 reaches a certain temperature, the resin film 14 is put into the frame 13. The upper surface of
the diaphragm 15 is brought into contact. The frame 13 and the diaphragm 16 are heated, the
outer periphery of the resin film 14 is the upper surface of the frame 13, and the central part of
the resin film 14 is heat-sealed to the upper surface of the diaphragm 16, as shown in FIG. The
diaphragm unit B) shown in FIG. FIG. 9 shows another embodiment of the present invention. This
embodiment is an example of a diaphragm unit using a plate-like frame 13 having a hole 13
'formed on the bottom surface. In this embodiment, a jig 2012ob obtained by dividing the jig 2o
in the above embodiment is used. A groove 22 into which the vibration plate 16 is inserted is
formed on the upper surface of the jig 20b, and a projection 23 to be inserted into the hole 13 of
the frame 13 is formed on the lower surface. In addition, a recess 24 into which the protrusion
23 of the -F jig 20b is inserted is formed in the jig 201L. In FIG. 9, the projection 23 of the jig
20b is inserted into the hole 13 of the frame 13, and the projection 23 is formed by the jig 20!
Then, insert the diaphragm 15 into the groove 22 of the jig 20b, heat the frame 13 and the
diaphragm 15, and heat the resin film 14 on the upper surface of the frame 13 and the
diaphragm 15. It is put on and heat-sealed. The completed diaphragm unit B is shown in FIG. The
present invention is configured as described above, and according to the manufacturing method
of the present invention, there is an advantage that fixation of the frame and the diaphragm and
fixation of the diaphragm and the diaphragm can be performed simultaneously and in a short
time. . Further, in the present invention, since heat fusion is carried out without using an
adhesive, it has an advantage of being able to prevent an increase in weight and an increase in
stiffness due to the protrusion of the adhesive.
[0002]
Brief description of the drawings
[0003]
1 is a perspective view showing an example of a diaphragm unit of an electromagnetic acoustic
transducer, and FIGS. 2 and 3 are cross sectional views of an electromagnetic acoustic transducer
using the diaphragm unit manufactured by the manufacturing method of the present invention.
Fig. 4 is an exploded perspective view of the same, Fig. 6 is a perspective view of a diaphragm
unit and a drive unit of the converter, and Fig. 6 shows an outline of a method of manufacturing
the diaphragm unit according to an embodiment of the present invention. 7 is a cross-sectional
view of an intermediate step of the manufacturing method, FIG. 8 is a cross-sectional view of a
diaphragm unit manufactured by the manufacturing method, and FIG. 9 is a diaphragm unit
according to another embodiment of the present invention. FIG. 1Q is a cross-sectional view of a
diaphragm unit manufactured by the same manufacturing method.
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13 ····· Frame, 13 ′ · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · small holes, 201 201 + 20b
...... jig, 21 ...... projections, 22 ...... groove, 23 ...... projections, 24 ...... recess. Name of Agent
Attorney Nakao Toshio Other 1 person Figure 1 Figure 5 Figure 3 Figure 5 Figure 7 Figure 4
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