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JPS5796597

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DESCRIPTION JPS5796597
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a, 1b and 1c are explanatory views of the bending
motion of the vibrator, and FIG. 2a and 2b are explanatory views showing the relationship
between the acting force direction on the vibrator and the bending direction of the vibrator. 3 is
a cross-sectional view of a piezoelectric speaker showing one embodiment of the present
invention, FIG. 4 is a plan view of the same vibrator, FIG. 5 is a cross-sectional view of the same,
and FIG. 6 is a vibrator showing another embodiment. FIG. 7 is a cross-sectional view of a
speaker showing another embodiment, and FIGS. 8a to 8e are sound pressure characteristic
diagrams. 10 иииииииииииииииииииииииииииииииииииииииииииииииии Metal plate, 12, 13.20.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
speaker, and relates to a piezoelectric speaker using a bimorph vibrator. The piezoelectric 1 [K
related] of the child. Conventionally, a bimorph vibrator of this type of piezoelectric speaker has
a structure in which a piezoelectric plate of dimensions between both picture #C of a metal 11 /
a single piece of metal 11 / a single piece is taken in a symmetrical position. In the cantilever
supporting method in which the luff vibrator is supported at one end side, the shape of the
insulator is generally rectangular. Then, when an alternating voltage is applied to this
photographing moving member, the photographing moving member 111 causes a bending
photographing movement with a node (1) of the basics 1 lK based on the support fixed lK as
shown in Fig. 1-1 and the free end side of the tip Shows the amplitude due to the ink IIIK. This
free end [1i moving board is connected to the shooting board is 41Ili! 1 Shooting along the tip
amplitude of the child, shooting and emitting as a sound wave. Then the frequency of the applied
voltage rises above the frequency of the node 1 (the frequency representing 11 V) and the free
movement of the genus curve appears at the free end II of the moving end II. In the end direction
K11llkL, the clause of the hand 6 (the button appears on the free end, and the phenomenon in
which the clause increases in a similar manner is a loss-prediction 23). The frequency band K at
which this node suffers, the position of the piezoelectric plate, the length of the node of 1 years
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(between 11 and f2) (sometimes the action of the piezoelectric plate (due to its bending direction
and vibrator The directions of the actual bending of the piezoelectric plates are all the same, but
the end of the piezoelectric plate is in the frequency range of As shown in Fig. 2, there are areas
where the bending direction (4) due to the acting force and the actual bending direction (6) of
the vibrator are reversed, which results in suppression of imaging movement and a reduction in
the force acting on the diaphragm. The sound pressure characteristics are rough. Therefore,
although the low band limit is basically determined by the length factor of the metal plate which
is the length of the vibrator, the characteristic as a speaker is determined by the factor of the
length of the piezoelectric plate to be combined, the band of efficiency is covered . That is, when
the length of the gold JII [the length of the piezoelectric plate is the same, the reproduction
probability of the lowest region in the metal plate size ((t) method tC is the highest, but the
frequency band due to the reaction is lower. The length of the piezoelectric plate is not a factor
for the uniform sound pressure bandwidth. The present invention is regarded as one of the
above-mentioned drawbacks, and since the bimorph moving member differs in the length of the
piezoelectric plate element having different lengths for forming the metal plate, it is possible to
use a shooting characteristic with frequency characteristics depending on the length. Therefore,
the present invention provides a piezoelectric speaker in which uniform sound pressure
stratification is expanded by transmitting the vibration source as a vibration source to a
peristaltic plate. Next, the drawing of the present invention will be described with reference to
FIG.
11 is a bimorph oscillator, and a piezoelectric plate element fladl molded of lead zirconate
titanate porcelain or the like is attached to both sides of a rectangular plate-like elastic base plate
made of lead zirconate titanate using an epoxy resin adhesive. The length of the piezoelectric
plate element LL20 is different (4) 1- \ 2, and the surface area of the piezoelectric plate element
tI-0 is formed to be substantially the same. The same piezoelectric plate element IIQl is formed
from the fixed portion 114 on the one end side of the metal plate I toward the tip end from a
position having a small clearance, and the long side piezoelectric plate element (: the end of the
elongated plate is a metal plate It is located slightly shorter than the tip of the U ??. Then, the
fixing portion I of the metal plate a is fixed to the speaker frame (the imaging lens fixing base
portion ?l of IS. In addition, the central part of a cone-shaped movable plate made of polyester
film with the speaker frame ?9 Kll edge fixed is adhesively connected on the center line Cl-1>
near the tip of the metal plate a of this image pickup motor fil. The piezoelectric plate element H
and the metal plate ?? are connected by alternating current 1liiK and connected by the same
conductive plate 113f1m as a parallel connection. The sound pressure characteristics of the
speaker will be explained based on the measurement results 15). The metal plate a is a
rectangular shape, and is formed of a phosphor bronze plate of 45 vertical and 19 horizontal, 0.2
dragon thick, and the length of one end fixing portion ? ? is 5 fi, and 1 u from this u part u 4
Between l! A piezoelectric plate element u3 molded with a lead zirconate titanate ceramic with a
width of 22 m, a width of 17 m, and a thickness of 0.2 ?m is attached to the upper surface of
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the metal plate I symmetrically on the upper surface with lIa? Similarly, a piezoelectric plate
element ul made of a lead zirconate titanate ceramic 54 m long, 11 mm wide and 0.2 mm thick is
symmetrically attached left-right symmetrically from the center line of the metal plate t111. The
fixing portion of the metal plate U? is fixed to the fixing base portion ? ? of the speaker frame
?9, and the speaker frame ? of the center line <t-i> at the inner side of one frame from the tip
of the metal plate 0! Cone-shaped vibration 1 [the inclination (adhesion becomes constant, the
peripheral edge is fixed to 9 (6) '--and the sound pressure at the distance of 101 on the axis 101
when the real number 1v signal is input, it becomes squeezing as shown in Fig. 8 + @IK, and a flat
band is obtained over 500 to 9 KH. That was confirmed. In the low range, the action of the
piezoelectric plate element 00 on the long side of the image pickup actuator becomes strong, the
action of the piezoelectric plate element 14 on the short side becomes strong in the middle
range, and the thick piezoelectric plate element + 1 '/ Jt1 m in the high range Obtained by the
interaction of Therefore, when measuring the sound pressure characteristics of a vibrator in
which various kinds of moving elements using the same metal plate of the vibrator are
incorporated in a speaker of the same structure, it is 8 years of age!
(As shown in 41. Fig. 6 (b) (a) (a) (a) (a) (a) The sound pressure characteristics shown in the
figure are as follows. In the case of a structured bimorph vibrator in which a piezoelectric plate
element of lead zirconate titanate ceramic with 54 m long, 11 mm wide and 12 m 1 I thickness is
attached to both surfaces of a metal (7) j plate. The sound pressure characteristics shown in Fig.
8tC + are obtained, and a unimorph zirconate lead zirconate titanate piezoelectric plate element
of 22 ?, 17 ? and 0.2 ? is attached only to one side of the metal plate. In the vibrator, the
piezoelectric plate element of lead zirconate titanate ceramic with vertical and horizontal
dimensions of 22 dragons, 171 horizontals and 0.2 in thickness is attached to both sides of the
metal plate. The sound pressure as shown in Fig. 8 (4) for the worn bimorph oscillator Indicate
the sex. In the embodiment, the longitudinal dimension of one piezoelectric plate ? (element +13
is a ratio of about 0.65 in comparison with the other piezoelectric plate element u3. In order to
clarify the t effect, each lateral dimension is taken so that the area ratio of the piezoelectric plate
element HQ3 becomes 1, and 11Jr-stitching. According to experiments other than the
experiment, the effect is clearly recognized from the vertical dimension ratio of 0.8 degrees.
Further, the area ratio of the piezoelectric plate element ttauv is not limited to the ratio 1 of the
embodiment, but by changing the ratio. The frequency characteristic can be adjusted according
to the purpose by strongly weakening or weakening the frequency band representing the abovementioned effect. In the above embodiment, the piezoelectric plate element 13 on the lower
surface of the metal plate a is formed longer than the length of the piezoelectric plate element @
on the upper surface, but it is shorter than the piezoelectric plate element I on the lower surface
of the upper surface. Good. Furthermore, in the real jIIfll, the rectangular piezoelectric plate
element 0u3 is attached to both sides of the rectangular metal plate I, but as shown in FIG. The
piezoelectric plate element (d) ran may be formed in a circular shape, and the length of one
piezoelectric plate element (4) may be a diameter of the other piezoelectric plate element I 211
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(with respect to a ratio of 0.8 or less. Furthermore, in the above embodiment, although the
cantilever structure supporting one end side of the vibrator III has been described, as shown in
FIG. 7, the metal plate is formed in a circular shape, and the diameter ratio is 0 on both sides of
this metal plate. And a piezoelectric plate element 1.2I 311 having a diameter different from 8 or
less is attached and formed, and a speaker frame a! If it is supported at 9, the imaging plate 1e
may be adhesively connected to the center of the piezoelectric plate element (2) on the upper
surface side at 41.
According to the present invention, the ratio of the length of the one element of the formed
piezoelectric plate element to the length of the opposite element with respect to the other of the
opposite element is 0.8 or less. So the long piezoelectric plate element is 111+; the two lowest
castles are mainly operated on the mobile plate, and in the zone where the reaction starts to
occur, the short piezoelectric plate element is the main (The vibration is caused to vibrate. And
the uniform sound pressure reproduction band is expanded.
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