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. 07, 2005
Filed:
Jun. 19, 2002
Yoshio Akimune, Ibaraki-ken, JP;
Fumio Munakata, Tokyo, JP;
Mikiya Shinohara, Kanagawa-ken, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A piezoelectric material includes a polycrystalline piezoelectric compound having a component composition defined as SrCaNaNbO, where x=0.05 to 0.35, and at least one rare earth oxide compound selected from the group consisting of YO, LaO, DyO, NdO, YbO, SmO, ErO, GdOand PrOto be added to the piezoelectric compound by 0.5 to 3.0 wt %. Moreover, a method of manufacturing the piezoelectric material includes blending ceramic materials, synthesizing, milling, pressing and sintering processes. In the synthesizing process, calcining is conducted at a temperature in a range from 1,050° C. to 1,150° C. for 2 to 12 hours in the atmosphere. And the sintering process includes first firing at temperature in a range from 1,180° C. to 1,270° C. for 4 to 8 hours in the atmosphere, and second firing at a temperature in a range from 1,370° C. to 1,400° C. for 10 to 75 hours in the atmosphere.