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:
Aug. 12, 2008
Filed:
Jul. 17, 2006
Yoshikazu Kihara, Tokyo, JP;
Katsunori Osanai, Tokyo, JP;
Yukio Hirokawa, Tokyo, JP;
Masaki Sobu, Tokyo, JP;
Yoshikazu Kihara, Tokyo, JP;
Katsunori Osanai, Tokyo, JP;
Yukio Hirokawa, Tokyo, JP;
Masaki Sobu, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A SAW device comprises a single crystal piezo-electric strate (made, for example, of LiTaOor LiNbO), and an interdigital transducer (IDT) formed of a material mainly containing Al and disposed on the piezo-electric substrate. The piezo-electric strate contains an additive (for example, Fe, Mn, Cu, Ti), and an orientation rotated by an angle in a range of 42° to 48° (more preferably 46°±0.3°) from a Y-axis toward a Z-axis about an X-axis. The IDT presents a normalized thickness h/λ (h: thickness of electrode, and λ: spacing between digits of the IDT) of 7% to 11%. A more appropriate substrate cut angle can be shown for the SAW device which employs a piezo-electric substrate containing an additive, to improve the electric characteristics thereof.