Laminated type piezoelectric substance

Abstract

Abstract PURPOSE:To prevent breakdown of piezoelectric plates, by covering the outer surface of the laminated body of the piezoelectric plates with a case, separately arranging plate members in addition to the case at the outside of insulating plates, which are provided at the end parts of the piezoelectric-plate laminated body, and finishing the contact surfaces of the plate members and insulating members at excellent flatness. CONSTITUTION:A high voltage of about 300-500 V is applied to each piezoelectric plate constituting a laminated plate 1 of piezoelectric substance through lead wires 8. Then the entire laminated body 1 of the piezoelectric plates is elongated in the laminating direction by the elongating amount of several tens of mum. The elongation is received by an upper cover 6 and a lower cover 7 through insulating plates 2. At this time, a high load of about 1,500 kg acts on the upper cover 6 or the lower cover 7. The load acts on the piezoelectric laminated plate 1 through the insulating plates. The contact surfaces of the upper and lower covers 6 and 7 and the insulators 2 are finished at excellent flatness. Therefore, the deviated load does not act on the piezoelectric laminated plate 1 even if the high load is applied on the upper and lower covers 6 and 7. The uniform load is always applied on the piezoelectric laminated plate. Thus an excessive load does not act on the piezoelectric laminated plate 1, and cracks are not yielded.

Inventors

• 👤 Tetsushi Hayashi
• 👤 哲史 林
• 👤 Masahiro Tomita
• 👤 正弘 富田
• 👤 Jun Niwa
• 👤 丹羽　準
• 👤 Akira Fujii
• 👤 章 藤井

Bibliographic Details