JPS51138078

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DESCRIPTION JPS51138078
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an embodiment of the
present invention, and FIG. 2 is a wave receiving sensitivity characteristic diagram. E ·
Piezoelectric element, 3 · · · · · · · Horn · 4 · · · · · · · · ·. Law one dose (dB) epidemic-601-I '70 <-8 o
万 万 05 05 (37-1 seconds-177-
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a piezoelectric transducer
having a thick case. In the conventional piezoelectric transducer, the thickness of the case is thin
and the fixation with the substrate is not stable, and satisfactory reception sensitivity can not be
obtained, that is, the actual M in FIG. 2 has no case. Since the sensitivity is the turtle sensitivity
which indicates the reception sensitivity and the lightening sensitivity indicates the reception
sensitivity when the case is exposed, the reception sensitivity is worse when the case is thin than
when the case is not attached. An object of the present invention is to improve the defects of
such a conventional piezoelectric transducer, and to provide a piezoelectric transducer excellent
in receiving sensitivity by using a case having a thickness of 04 order or more. ? To aim. α)
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings. In FIG. 81, 1 is a substrate and has protrusions 1a and 1b. 7 The piezoelectric element
2 is mounted on the protrusions 1a and 1b. The horn 3 is fixed to the piezoelectric element 2.
The outer case 4 is fixed to the substrate 1 [^]. The outer case 4 has a thickness of C04Jff or
more. As in the present embodiment, when the thickness of the case 4 is 0.4 AM or more, the
case is not attached as shown by the solid line and the delivery sensitivity 9 as shown by white
lines in FIG. In this case, it can be understood that the reception feeling is improved compared to
the case where a thin case such as a □□□ wire is attached. As described above, since the
present case with a thickness of 1 or (4 In In or more is used, very good wave reception
sensitivity can be obtained.
04-05-2019
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