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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention,
FIG. 1 is a plan view, and FIG. 2 is a cross-sectional view taken along the line I--E. 1 · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · piezoelectric element, 3 · · · · · ·.
The present invention relates to an electric 7'-echo conversion element in which a piezoelectric
element is integrally attached to the main surface of a diaphragm, and the target treatment is to
concentricize four pressure elements on the main surface of the diaphragm. (The purpose of the
present invention is to provide a conversion element to an electric sound which can prevent the
performance deterioration due to the i heart by providing a line serving as a reference (i) and
significantly improve the contact workability. Referring to the drawings, reference numeral 1
denotes a circular diaphragm made of metal, plastic or the like, 2 denotes a small-diameter
piezoelectric element attached to the main surface of the diaphragm 1, and in the present
invention, The main surface is provided with streaks 3 which are concentric with the
transmission 1-dubular plate and have the same shape as the piezoelectric element 2. The bars 3
can be attached simultaneously with the punching and self-forming of the diaphragm by
providing an annular projection or recess for forming a bar under the punch of the press
punching machine. Since the present invention is configured as described above, when bonding
the piezoelectric element to the main surface of the diaphragm, it suffices to use the streaks
attached to the main surface of the diaphragm as a guide. Since it is possible to bond to the
surface, the performance deterioration due to the eccentricity and the variation are small
(otherwise, the bonding operation is also facilitated and mass production can be remarkably
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description, jps55100397
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