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DESCRIPTION JPS5168535

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DESCRIPTION JPS5168535
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged perspective view for explaining
the piezoelectric body, FIG. 2 is an explanatory view of -fit of the acoustic transducer, and FIG. 3
is a perspective view of an example of the piezoelectric transducer according to the present
invention. FIG. 4 is a diagram provided for the explanation. 11 is a plate-like elastic body, 12 is a
piezoelectric film, and 13a and 13b are its electrodes. Figure 1 Figure 2 Figure 1) Figure 3 91-
DETAILED DESCRIPTION OF THE INVENTION The present invention is suitable for use in
piezoelectric transducers, particularly blue tatami transducers such as speakers and microphone
sef-on. In place of piezoelectrics such as quartz and ceramic, soft flexible polymer piezoelectrics
with a low mechanical impedance have been developed, among which β-polyvinylidene fluoride
is a particularly uniaxially stretched part that exhibits particularly large piezoelectricity. The
island molecule is known as 7 rum. As shown in FIG. 1, metal sheets 1k (2m) (2b) 'i are provided
on both sides of a piezoelectric sheet Il + made of polyvinylidene fluoride film having
piezoelectricity from long stretching and dividing treatment mK, For example between the two if!
-When a signal voltage is applied, this sheet exhibits an expansion and contraction motion of ll 應
X, · 6 · ') immediately following the arrow due to the piezoelectric transverse effect. In order to
generate sound pressure using this effect, for example, the piezoelectric film to be tapped shown
in FIG. 2 is bent in an arch shape, its ends are fixed, an audio signal voltage is applied to it, and
the film is expanded or contracted. It is conceivable that the bow is caused to expand or retract to
generate sound pressure in accordance with this f 'LVc. However, according to such a method, it
is necessary to use a 7-t film or a film lll [so-called tension, and if this tension is incomplete, the
necessity to support it with urethane foam etc. arises, in this case a support Due to the damping
effect due to the characteristics, the characteristics are limited, the conversion efficiency is poor,
and a complete piston movement can not be obtained from the cedar-like structure, so that the
conversion efficiency is low. It is an object of the present invention to provide a piezoelectric
transducer which can be applied to a case of forming an acoustic transducer tw4 using a
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polymeric piezoelectric material and to obtain a large conversion efficiency without the
disadvantages of the present invention. To illustrate an example of the present invention with
reference to an lEB drawing tube, the piezoelectric transducer of the present invention is
generally shown in FIG. 12): · 'In the present invention a, ◆ 1 l 11 i 111. Resin example First of
all, a 0.4 m thick rectangular polystyrene soft elastic I [Q11 is bowed in the longitudinal
direction, ie, in a cylindrical surface, a pictorial piezoelectric material between both ports For
example, a 6 micron thick piezoelectric polymer film ttat-stretched so that its stretch direction is
along the bow chord direction. Metal IE et al. (13a) and (13b) are respectively deposited on the
wall surface of this piezoelectric body α2 by vapor deposition etc., and the action between the
two 'IL poles gives an audio signal voltage. Father, the elastic plate αIl fixes its +85, that is, the
back of the upper middle part fixed by flA 114 JK. As described above, when the signal turtle-ft is
applied between both electrodes (121) and (12b) of the piezoelectric body +13, it expands and
contracts, and accordingly the elastic body U 纂 closes and opens 7t according to this as shown
by 4WIJK. It is deformed as it is, and along with this, the piezoelectric body Q3 Hi!
In FIG. 4, as shown in the chain edge, vibration is generated by holding the parallel-shaped
diverter vertically and sound pressure is generated. As described above, according to the device
of the present invention, f'L changes the expansion m due to the audio signal voltage of the
piezoelectric body by 4 & 111K by parallel movement, so it is possible to increase the demonicacoustic conversion motion S sound. +3) 25. Also, since the structure is a structure in which a
sheet-like piezoelectric body is stretched on an arc-shaped elastic plate, it is easy to purchase or
use and its practicality is large. It should be noted that although the example described above is
the case where the present invention is applied to a speaker that converts an electrical signal to
sound, it will be apparent that the same effect can be obtained by applying to a microphone that
obtains an electrical signal by sound pressure. Further, a large sound pressure or a large output
signal can be obtained by arranging a plurality of sheet-like piezoelectric members stretched on
the elastic plate + Ill shown in FIG.
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