| 摘要 |
(a) process for printing electrodes (2) and a link condenser (3) on piezoelectric ceramic element (1); (b) process for coating an ultrasonic wave absorbent (5) like epoxy or silicon resin on the element except the vibration part (4) formed on the electrodes; (c) process for coating an elastic material (6) having small elastic ratio on the vibration part (4); (d) process for coating the resin (7) around the filter. The absorbent (5) absorbes the unnecessary vibration propagating in different directions.
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