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DESCRIPTION JPS5282342

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DESCRIPTION JPS5282342
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of a conventional piezoelectric
transducer, FIG. 2 is a top view of another conventional example, and FIGS. 3 and 4 are
piezoelectric transducers according to an embodiment of the present invention. It is a sectional
side view of an apparatus. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · E · thermal expansion
elastic body. -101- Japanese Utility Model Application No. 52-82342 (2) -102-
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a high frequency
filter and a piezoelectric transducer such as a long ring provided with an input side electrode and
an output side electrode facing each other on a piezoelectric ceramic plate, unnecessary reflected
waves To prevent the occurrence of ripples and the deterioration of Spurian fertility. First, in the
conventional piezoelectric transducer of this type, the genus 11I and% Kli will be described. The
piezoelectric ceramic plate 2 is provided on the printing base I [1] of a 1-line glint substrate,
which is a 1-line glint substrate. A 9 input electrode 010111 electrode provided on the upper
surface of the piezoelectric ceramic plate 2 and a tank lid electrode on the output side provided
with the WK on the piezoelectric ceramic 1 [2 similarly, 4.4 ′ is the piezoelectric ceramic plate
described above It is a resin for reflection wave absorption applied to the end of 2. When a signal
is applied between the input side comb power electrodes 13, a surface wave lasts, and the
surface wave propagates on the surface of the piezoelectric ceramic plate 3 and reaches the tank
lid electrode 3 'on the output side and is converted into an electric signal It is In this type of
piezoelectric transducer, the surface wave generated on the input side propagates not only in the
direction of the comb electrode a 'on the output side, but also in the direction opposite to the
bridge electrode 3'. The reflected wave is reflected at the end of the wave and becomes a
reflected wave, and this reflected wave and the surface wave propagating in the direction of the
comb electrode 3 'interfere with each other to cause a pull in the band9 and a deterioration in
spurious characteristics was there. This large, daughter in the conventional example shown in the
JIII diagram, Tree @ a. 4 'is Ik * to stop the life of the reflected wave. However, in the case of
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applying the resin 11414 'as described above, the resin 4, 4' may also adhere on the combshaped electrodes 3, 3 'and the generation of surface waves may be hindered. It is necessary to
pay close attention to the coating operation of resin 4, 4 'and there is a drawback that the
workability is bad. @ 2 @ shows another conventional example, in which the uneven portions s
and g 'are formed at the end of the piezoelectric ceramic plate 2, and the nine waves are
propagated in the direction of the wedge surface of the piezoelectric ceramic plate 2 and the
above uneven portion 6. The light is reflected by 6 'to prevent reflection. However, in the case of
this conventional example, there is a defect that the piezoelectric ceramic plate 2 is broken or the
comb-like electrodes 3, 3 'are damaged when the concavo-convex portion 6.6' is formed. The
present invention eliminates the above-mentioned conventional defects, and an embodiment of
the present invention will be described below with reference to FIG. 3 and a JIA drawing with the
same reference numerals as in FIG. In FIG. 3 and J [4, reference numeral 6 denotes a case, in
which the piezoelectric ceramic plate 2 is provided to receive and store the printed circuit board
1 therein. 7 'is an elastic body at 鵬 ll #, and a thermally expandable elastic body 7' is between
the upper end portion of the piezoelectric ceramic plate 2 and the upper inner wall of the case 6
'', 4). (The thermal expansion elastic body 7, 7 'expands when heated in the state shown in the
inserted 1 gS diagram, and the thermal expansion elastic body 7.7' is the upper surface end of
the piezoelectric ceramic plate 2 as shown in FIG. Not only the portion but also the end face of
the piezoelectric ceramic plate 2 is in contact with four.
As the heat J11 elastic body, a heat-shrinkable rubber etc. which shrinks in the length direction
by heating but expands in the thickness direction of 7 are used. As shown in FIG. 4, the thermally
expandable elastic material 7.7 'absorbs Table 1i [ial and prevents reflection. As described above,
the piezoelectric conversion device of the present invention: iii has a structure in which the
thermal expansion elastic body is brought into contact with the upper surface and the @ surface
of the end of the piezoelectric ceramic plate, and as in the conventional example O shown in FIG.
There is no risk that the crucible will adhere to the electrode, and the piezoelectric ceramic plate
will not be broken or chipped when forming the uneven portion as in the conventional example
shown in FIG. It has the advantage that it works well by only interposing it between itself and the
case and heating it.
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