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JPS54151333

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DESCRIPTION JPS54151333
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional front view showing an
embodiment of a piezoelectric electroacoustic transducer according to the present invention, FIG.
2 is a perspective view of a frame used for the transducer, and FIG. It is a perspective view of the
case used for a converter. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · side plate, 7 · · · ----- holes, 8 ..... protrusion 9 ...... tapered surface, and 10 ...... eldest
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
type electroacoustic transducer using a polymeric piezoelectric film as a vibrating film, and to
impart a constant curvature to this vibrating film with a simple structure. In the case of seven
polymer piezoelectrics formed of polymer piezoelectric material and forming electrode direction
on both sides by vapor deposition or lamination, etc., and using ILUM as a vibrating film, In
addition to means for determining the frequency characteristics and changing the elastic
modulus and density of the polymeric piezoelectric film by α- / 7232-, it is considered effective
to have a semi-circular curvature. From such a thing, in order to obtain a curvature radius with
high accuracy, the frame which fixes the polymeric piezoelectric film is obtained by cutting or
press forming to obtain a predetermined shape, and the frame becomes expensive and the curved
surface of the frame becomes high. In order to bond the molecular piezoelectric film with an
adhesive, it is processed, and wrinkles are generated on the surface of the polymeric piezoelectric
film, which has a drawback such as greatly affecting output sound pressure and the like. The
present invention eliminates the above-mentioned conventional drawbacks. Hereinafter,
embodiments of the present invention will be described with reference to FIGS. 1 to 3 of the
accompanying drawings. In the drawings, 1 is a rectangular frame made of a material having
elasticity such as stainless steel or phosphor bronze, and the frame 1 is formed of a polymer
piezoelectric material and electrodes are deposited or attached on both sides) ' A vibrating
membrane 2 made of a high molecular weight piezoelectric film is attached at 3 °. This bonding
takes place in the condition of the frame 1 which is not folded as shown in FIG. Those configured
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in this way are incorporated into a U-shaped case 3 configured of an insulating material such as a
synthetic resin. This case is formed in a U-shape by a bottom plate 4 and side plates 5.degree. 6
rising upward at both ends of the bottom plate 4 as shown in FIG. 3, and a plurality of through
holes 7 are formed in the bottom plate 4. It is done. Further, an inward projecting protrusion 8 is
provided on the inner wall surface of both side plates 6, 6, and a tapered surface 9 is formed in
the lower portion of this projecting portion 8 such that the thickness of the projecting portion 8
becomes thinner toward the lower end There is. The end side 1C of the bottom plate 4
corresponding to the tapered surface 9 has a long hole 1o. And, the dimension between the side
plates 5 and 6 of the case 3! Thus, the width W of the -F frame 1 is longer. Therefore, if the
frame 20) to which the vibrating membrane 2 is attached and 1 are incorporated between the
side plates 6 and 6 of the case 3, as shown in FIGS. Is fixed in contact with the bottom plate 4
and the lower portion of the tab 9 of the projecting portion 8 of the side plates 5 and 6 so that
the frame 1 and the diaphragm 2 are curved with a constant curvature.
In the figure, reference numeral 11 denotes a lead wire drawn from the vibrating membrane 2.
As described above, since the piezoelectric-type electroacoustic transducer according to the
present invention is configured, the dimensions of the case and the frame can be made highly
accurate, so that the vibrating film can be bent with a uniform curvature and characteristics such
as resonance frequency The stable ones can be mass-produced. In addition, since the vibrating
membrane is adhesively bonded to the flat frame, wrinkles are not generated in the vibrating
membrane and the output sound pressure is not reduced, and the manufacturing efficiency can
be excellent. In addition, since the frame is simply a rectangular frame, it can be obscured by
processability and can be obtained at low cost, for example, so as to be immersed in economics.
Thus, it has many advantages and is of great practical value.
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