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DESCRIPTION JPS53137127

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DESCRIPTION JPS53137127
-· Description 薔 1, title of the invention
Piezoelectric microphone manufacturing method
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a piezoelectric microphone using a polymeric piezoelectric film as a vibrating film.
FIG. 1 shows a microphone unit of this type of piezoelectric type microphone k) 0 In FIG. 1, 1 is a
polymeric piezoelectric film such as polyvinylidene fluoride film, and the frame 2 of the
polymeric piezoelectric film 1 The above-mentioned polymeric piezoelectric film 1 is W7 jlf so as
to follow the curvature of the frame 2 on one side of the microphone unit 3. As shown in FIG. 1,
in a state where the polymeric piezoelectric film 1 is adhered to one side of the frame 2, one of
the electrodes of the piezoelectric molecular film 1 and the frame 2 are electrically conducted.
Reference numeral 4 denotes a t'I-connected wire connected to the frame 2 and 6 denotes a lead
wire connected to the other electrode of the polymeric piezoelectric film 1. A sound pressure is
applied to the polymeric piezoelectric film 1. An electrical signal can be obtained between the
ridges 4 and 6. As shown in FIG. 2, the above-mentioned microphone unit 3 is attached to the
opening of the case 6 whose top surface is open to constitute a piezoelectric microphone. FIGS.
3A and 3B show a conventional method of bonding the polymeric piezoelectric film 1 to the
frame 2. In FIG. 3, the polymeric piezoelectric film 1 is pulled in four directions, and the
polymeric piezoelectric film 1 is bent so as to have the same curvature as the frame 20, and the
bent polymer pressure EndPage: 1 The outer periphery of the high molecular weight
piezoelectric film 1 was cut off along the outer shape of the frame 2, and the microphone unit 14
was completed as shown in FIG. 3B. However, according to the manufacturing method shown in
FIG. 3, tension must be applied to the polymeric piezoelectric film 1 so that the polymeric
piezoelectric film 1 is in a bent state, and the workability is poor. Unnecessary parts had to be
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cut, which was not suitable for mass production. 4A and 4B are other conventional
manufacturing methods? It shows. In this production method, tension is applied from the four
sides of the polymeric piezoelectric film 1 to form a polymeric piezoelectric film 1 (il-flat plate,
and a plurality of flat frames 2 are sequentially bonded to the polymeric piezoelectric film 1 and
then cylindrical molecules The piezoelectric film 1 was cut along the outer shape of the frame 2,
and then the frame 2 was processed into a curved shape as shown in FIG. 4B. Therefore, while it
has the advantage that this bonding operation can be easily performed, it is necessary to bond
the individual frames 2 to the intermolecular piezoelectric film 1 sequentially, and the step of
cutting the sweet polymeric piezoelectric film 1 is necessary, There was still a problem with
workability.
The present invention eliminates the above-mentioned conventional drawbacks, and one
embodiment of the present invention will be described below with reference to FIGS. 6A and 6B.
In FIG. 6A, 7 is a frame plate in which a plurality of holes 8 are formed, and this frame plate 7 is
adhered to the molecular piezoelectric film 1 which is in a planar shape and given tension from
four sides, and then 6A, the outer peripheral portion of the hole 8 of the frame plate 7 is
punched out to form a flat microphone unit k), and then the frame 2 of the microphone unit is
formed as shown in FIG. 6B. Is processed into a curved shape. FIG. 6 shows another embodiment
of the present invention, in which a microphone unit If it is incorporated into a case without
bending it into a punched flat microphone unit If it is not formed into a curved shape. It is a
thing. In FIG. 6 to be described with reference to FIG. 6 below, in FIG. 6, 9 is a case where the
upper surface is a curved surface, 10 is a hole formed in a curved surface of the upper surface of
the case 9, An insulating plate disposed on the inner peripheral surface of the inner case 12 is an
inner case having an open upper surface, and a hole is formed on the upper surface of the inner
case 12. As shown in FIG. 6, the flat microphone unit 13 is inserted into the case 9 and the inner
case 12 is further inserted, and the flat microphone unit 13 is shown by a broken line on the
upper surface of the inner case 12. As if it were in the form of a curve. As described above,
according to the present invention, after the polymeric piezoelectric film is adhered to one side of
a flat frame plate having a plurality of holes formed therein, the outer peripheral portion of each
hole of the frame plate is punched out The unit is formed into a fold, and then this microphone
unit is formed into a curved shape, and as it becomes the manufacturing year of the present
invention, the frame plate and the polymer piezoelectric film are punched simultaneously to form
the microphone unit Therefore, it is excellent in mass productivity.
4. Brief description of the drawings. FIG. 1 is a perspective view of a microphone unit, FIG. 2 is a
perspective view of a piezoelectric microphone using the same microphone unit, and FIG. 3A is a
perspective view of a process of manufacturing a conventional microphone unit. Fig. 3B is a
perspective view of the completed state of the same microphone unit, Fig. 4A is a perspective
view of an intermediate step of fabricating another conventional microphone unit tg, and Fig. 4B
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is a perspective view of the completed state of the directional microphone unit. Fig. 6A is a
perspective view of an intermediate step in the manufacturing method of the present invention,
Fig. 5 is a perspective view of a completed state of BUr = J microphone unit, and Fig. 6 is a
piezoelectric microphone of another embodiment of the present invention. FIG. DESCRIPTION OF
SYMBOLS 1 ...... Polymeric piezoelectric film, 2 ...... frame 7 ......... frame board, 8 ... hole, 9 ... outer
case, 10 -... hole, 11 ... ... Insulating plate, i12----Inner case, 13 ..... Microphone EndPage: 2 units.
Name of agent Attorney Nakao Toshio and others 1 person-· · · L \ Figure 1 Figure 2 Figure 3
EndPage: 3
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