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JPS5711898

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DESCRIPTION JPS5711898
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view and a schematic sectional view of a
conventional piezoelectric buzzer, FIG. 2 is an enlarged sectional view of FIG. 1 A, and FIG. 3 is a
piezoelectric according to the present invention. FIG. 4 is a schematic cross-sectional view
showing one embodiment of a buzzer, and FIG. 4 is an enlarged cross-sectional view of a portion
A of FIG. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · adhesive.
DETAILED DESCRIPTION OF THE INVENTION The present invention provides an inexpensive
piezoelectric buzzer having the same performance as a conventional piezoelectric buzzer by
replacing the double-sided metal electrode or noble metal electrode of the piezoelectric ceramic
element with a single-sided oxide electrode. It is said that. That is, the piezoelectric buzzer of the
present invention is formed by coating silver on one side of a piezoelectric ceramic element,
forming an oxide of tin or tin oxide on the other side, and forming an oxide as described above. ,
Poles □ and □ j,? □い。 □よお、。 It has an overwhelming structure, and is a low cost
piezoelectric buzzer with one square and two peaks. The conventional piezoelectric buzzer has
two ports and two in FIG. ! : ') KE 90' * (7) Miiii KBn '); h, using silver as the electrode, contact the
metal diaphragm 3 and the piezoelectric ceramic element 1 with an adhesive agent 4 etc.
However, since silver is used on both sides in such a structure as the electrode, it has a problem
that it becomes expensive due to the increase of the material cost. The present invention has
been made to eliminate such problems, and one embodiment of the present invention will be
described with the same reference numerals as in FIG. 3 and FIG. The piezoelectric buzzer of the
present invention is characterized in that an oxide of tin or an oxide of indium is used as the
electrode 2 'on the side to be bonded to the diaphragm 3. That is, the electrode 2 'on the side to
be bonded to the diaphragm 3 is coated with several hundreds angstroms to several microns of a
conductive material having a relatively high resistivity such as tin oxide or indium oxide. By
doing this, it is sufficient to consider only the resistance in the thickness direction with respect to
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the three diaphragms 3 described above. For example, if the oxide electrode 2 'of 1 Ω- 鑞 has a
thickness of 3 ooi, the oxide electrode 2' is 0.39, and even if it has a high resistivity to silver, a
piezoelectric resistor of resonant resistance 3 oΩ to 1 Ω It was confirmed by experiment that
the performance is not inferior in the buzzer. Therefore, with the piezoelectric buzzer of the
present invention, the amount of silver material used can be reduced to the conventional station
and can be provided inexpensively.
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