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DESCRIPTION JPS5284221

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DESCRIPTION JPS5284221
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a conventional
spherical sound source speaker. FIG. 2 is a partially sectional side view of a conventional
spherical sound source speaker. FIG. 3 is a plan view showing a bell-shaped isotropic
piezoelectric polymer film diaphragm constituting the rescue speaker of the present invention.
FIG. 4 is an external perspective view of the nondirectional rescue sound source Sbika of the
present invention. FIG. 5 is a cross-sectional view of the omnidirectional rescue sound Sbika of
the present invention. 1, D .. Isotropic piezoelectric polymer film diaphragm, 2 ... Fixed plate, 3 ...
Glass fiber. Fig.1 Fig.2-45 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 actual opener 52-84221 (2) 46
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the
directivity of a spherical source speaker. For example, as shown in FIG. 1, a conventional
spherical sound source speaker is formed by combining two isotropic piezoelectric polymer film
diaphragms l formed in a hemispherical dome shape into a spherical shape and fixing the entire
opposing periphery by a fixing plate The polymer film diaphragm l has the metal for electrodes
deposited on both sides thereof, and is connected to an external signal source through the (I)
terminal. Inside the spherical sound source speaker, as shown in FIG. In the conventional
spherical sound source speaker having the above-mentioned structure, when the diaphragm l
made of an isotropic piezoelectric polymer film whose peripheral portion is fixed is applied with
a signal voltage to metal electrodes deposited on both sides, FIG. A recumbent position is
produced in the circumferential direction of the arrow direction shown in FIG. When the added
signal voltage is an audio signal consisting of alternating current, it takes a vibration form shown
by a dotted line. This vibration form is called a vibration method, has eight-character directivity
in the high sound area, and has a drawback not to be a nondirectional speaker. In this method,
when forming the film in the manufacturing process of the diaphragm 1, vapor deposition and
polarization are performed first, and after that, when it is molded into a dough shape (2), it tends
to cause cutting of the vapor deposition electrode part during molding. However, there is a
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disadvantage that the temperature and the like are subject to restrictions without damaging the
polarization effect. Furthermore, after the film is formed into a hemispherical shape and an
electrode is formed by vapor deposition, in the case of polarization, the film on the hemisphere is
polarized, causing a problem that polarization becomes difficult. As mentioned above, the
conventional spherical sound source speaker has many drawbacks, but the solution is difficult.
The present invention pays attention to this point, eliminates the drawbacks of the conventional
device, and aims at easily solving the eight-character directivity and the difficulty of polarization
etc. Non-directional ball sound source sp) itif ′ ′ fbt V) Thb. The present invention is formed
into a spherical shape such as two thin bell-shaped thin isotropic piezoelectric polymer molecules
1 and an ear 1.2 □□ -zo □ 1-1 ° 5-1 ヱ 1 (3) i And are non-directional. Hereinafter,
embodiments of the present invention will be described with reference to the attached drawings.
FIG. 8 shows the above two thin bell-shaped thin isotropic piezoelectric polymer film diaphragms
1 according to the present invention, both sides of which are deposited with an electrode metal
and then polarized in a film state. FIG. 4 is an external view of the ball sound source speaker of
the present invention which is constructed by joining the peripheries la of the two bell-shaped
film diaphragms 1 'shown in FIG. 8 to one another. The peripheral lα is adhesively bonded to
one another in order to form the bell film 1 in a spherical shape.
FIG. 5 is a cross-sectional view of a spherical sound source according to the present invention,
which has a spherical shape j (for standing wave absorption in the molded isotropic piezoelectric
polymer film diaphragm l and as well)] (4) Glass fibers 8 are filled to keep them spherical. When
using the sphere sound source speaker according to the present invention as constructed above,
it is not joined in the circumferential direction by the fixed plate as in the conventional device,
but is formed to give uniform characteristics in each radial direction Not only is it possible to
obtain a spherical sound source speaker close to non-directionality, but also in the film
diaphragm manufacturing process, it is possible to polarize easily as compared with the
conventional one because it fractionates in the film state It has a superior effect.
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