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. 12, 2001
Filed:
Sep. 14, 1999
Kenji Inoue, Tokyo, JP;
Katsuo Sato, Tokyo, JP;
Hiroki Morikoshi, Tokyo, JP;
Katsumi Kawasaki, Tokyo, JP;
Kiyoshi Uchida, Tokyo, JP;
TDK Corporaton, Tokyo, JP;
Abstract
A surface acoustic wave device has a piezoelectric substrate whose properties include electromechanical coupling coefficient advantageous to widening passband width and SAW velocity advantageous to achieving a compact surface acoustic wave device. The piezoelectric substrate is composed of the single crystal represented by chemical formula Sr,TaGa,Si,O,belonging to point group,For example, cut angle of the single crystal and propagation direction of the surface acoustic wave are in region,-,wherein said region,-,represented by Euler angles (&phgr;, &thgr;, &psgr;) satisfies &phgr;=25° ˜35°, &thgr;=20° ˜90°, &psgr;=−40° ˜40°. These angles may be in range 1-2, wherein said range 1-2 satisfies &phgr;=25° ˜35°, &thgr;=20° ˜90°, &psgr;=−25° ˜25°.