The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 1994
Filed:
Feb. 20, 1992
Ichiya Sato, Hitachi, JP;
Takao Yoneyama, Katsuta, JP;
Hisanori Okamura, Ibaraki, JP;
Satoshi Kokura, Hitachiohta, JP;
Minoru Yanagibashi, Naka, JP;
Hitachi, Ltd, Tokyo, JP;
Hitachi Material Engineering, Ltd., Katsuta, JP;
Hitachi Engineering Service Co., Ltd., Ibaraki, JP;
Abstract
The features of the present invention are 1) to apply metallization on the bonding surface of a piezoelectric ceramic with a metal likely to react with the piezoelectric ceramic material, 2) when the piezoelectric ceramic material is soldered on the bonding surface, to apply metallization with a metal likely to react with the solder material, 3) to provide between the metallizing layers formed in 1) and 2) a metallizing layer including metal which prevents reaction between the metals and their diffusion, 4) to use a mounting member for the piezoelectric ceramic which has substantially the same thermal expansion coefficient as the piezoelectric ceramic in non-polarization condition and 5) to solder in the non-polarization condition and thereafter to polarize. As the result, a bonded type piezoelectric apparatus with a high reliability or with a broad application temperature range near from the absolute zero temperature to the Curie point of the piezoelectric element, and a method of manufacturing the same are provided.