piezoelectric ceramic filter

Abstract

Abstract PURPOSE:To improve the reliability by inserting or packing an insulator having a thermal expansion coefficient equal to that of a piezoelectric element to a slit part of the piezoelectric element so as to prevent crack defect of the piezoelectric element. CONSTITUTION:Since the direction of the stress when the root of the slit is cracked is a direction along which the input/output electrodes 4a, 4b of the piezoelectric element are retracted, the insulator 10 is inserted to the slit part to prevent the deflection of the piezoelectric element. The gap between the insulator 10 and the piezoelectric element is minimized in this case. This insulator 10 has a thermal expansion coefficient almost equal to that of the piezoelectric element, and it is formed by packing a thermosetting resin taking the working performance into account or adhering a rod-shaped insulator.

Inventors

• 👤 Yukio Kashiwagi
• 👤 柏木　行夫

Bibliographic Details