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:
May. 20, 2003
Filed:
Oct. 02, 2001
Seiko Epson Corporation, Tokyo, JP;
Abstract
A surface acoustic wave device is provided having a substrate made of quartz, a pair of inter digital transducer-shaped electrodes made of an aluminum layer, an electrode pad, and a pair of lattice-shaped reflectors made of the same material as the electrode. The crystal structure of the aluminum layer composing the electrode is a twin crystal structure, where crystal grains of the (−1 1 1) plane and the (0 0 2) plane and crystal grains of the (1 −1 −1) plane and the (0 0 −2) plane are in a twin crystal relationship with the (−1 1 −1) plane and the (1 −1 1) plane of aluminum as the twin boundaries. Also, the {1 1 1} plane of the aluminum layer is oriented to an 8° inclination relative to the {0 1 0} plane of quartz composing the substrate.