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JPS5234287

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DESCRIPTION JPS5234287
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing the vicinity of
the main spindle of an automatic lathe, FIG. 2 is a left side view of FIG. 1, and FIG. 3 is a direct
view type showing one embodiment of the present invention. FIG. 4 is a schematic cross-sectional
view of a centering apparatus using an endoscope, FIG. 4 is a schematic view of a direct-viewing
endoscope, and FIGS. 5 and 6 are perspective views showing an adapter for the side-viewing
endoscope. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · tip of the direct-view endoscope, 28 · · · ·
Adapter, 43 · · · · · · · · · Tip of the side-viewing endoscope, 45, 52 · · · · · · · · ·. Fig. I-189-Japanese
Utility Model Sho 47-34287 (2) Fig. 27 '55 "' 口 = じ (P 冫 ', 66 話 story (C)-190-real computer
Sho 47-34287 (3 5) Correct the range of utility model registration as follows: 0
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
level sensor in which a piezoelectric ceramic plate and a metal plate are bonded to form a
vibrating portion, and the vibrating portion is used as a detecting portion. In particular, a
piezoelectric ceramic plate as a metal plate material It is an object of the present invention to
prevent cracking of the adhesive layer due to the difference in the linear expansion coefficient
using a metal material having a linear expansion coefficient substantially equal to. FIG. 1 shows a
conventional piezoelectric type level sensor. A piezoelectric ceramic plate 1 is bonded to a metal
plate 2 to form a vibrating portion, which is held by a cous. In addition, this vibration part may be
integrally formed. When the signal voltage is applied through the lead wire 4, the vibrating
portion 1- has impedance characteristics as shown in FIG. 2 in the vicinity of its natural
frequency. That is, the impedance characteristic of the vibrating portion differs depending on the
medium in contact, and in FIG. 2, assuming that the impedance characteristic 5 in the air, the
impedance characteristic in the liquid becomes the curve 6. This is because the liquid further
suppresses the vibration. A piezoelectric level sensor detects a liquid ball or the like by using the
difference in impedance between the air and the liquid first. When this piezoelectric level sensor
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is used to detect the level of engine oil of a car, a heat cycle of about -40 ° C to + 150 ° C may
be applied. However, if the vibrating portion is composed of a piezoelectric ceramic plate and a
metal plate such as brass or aluminum, the coefficients of expansion differ greatly, and stress is
applied to the adhesive layer between them during the heat cycle to cause distortion. The crack is
generated in the adhesive layer to deteriorate the vibration characteristic. For this reason, there
is a disadvantage that the detection ability of 'thIt' is lowered. The present invention has been
made to eliminate the drawbacks in the above prior art 2- 技術, and in particular, by using a
metal material having a linear expansion coefficient substantially equal to that of a piezoelectric
ceramic plate as a material of a gold-blade, by sheet cycle. It is an object of the present invention
to provide a piezoelectric level sensor whose characteristics do not deteriorate. Generally, the
linear expansion coefficient of the piezoelectric ceramic plate is 4 × lo− ′ ′, / c, but the linear
expansion coefficient of pure silver is 6.5 × to−6 / ° C. Therefore, a strain is generated in the
adhesive layer due to the heat cycle due to the difference in the coefficient of linear expansion
between the piezoelectric ceramic plate and the metal plate constituting the vibrating portion.
However, some iron-nickel alloys, such as iron-llackle alloy DF42N manufactured by Daido Steel,
have a linear expansion coefficient of 4-5.times.10-67 DEG C., which is almost equal to that of the
piezoelectric ceramic plate. Therefore, by bonding this iron-nichrome-gold to the piezoelectric
ceramic plate, it is possible to prevent the adhesive layer from being cracked due to the
difference in linear expansion coefficient caused by the heat cycle.
As apparent from the above description, according to the present invention, the material of the
metal plate is selected 69 materials having an i linear expansion coefficient substantially equal to
that of the piezoelectric ceramic plate, and the sheet cycle is 0 and 111 °. As a result, it is
possible to obtain a piezoelectric level sensor whose impedance characteristics do not change.
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