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:
Dec. 14, 1982
Filed:
Dec. 03, 1980
Osamu Yamazaki, Suita, JP;
Junichi Inohara, Katano, JP;
Kazuo Tazuke, Nara, JP;
Kiyotaka Wasa, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A surface acoustic wave transducer having a piezoelectric thin film, interdigital electrodes disposed on one side surface of said piezoelectric thin film and an apodized counter electrode disposed on the opposite-side surface of said piezoelectric thin film. The outline of the apodized counter electrode is composed of parallel edges parallel to fingers of the interdigital electrode and perpendicular edges perpendicular to the fingers. The parallel edges are positioned in gaps between the fingers, so as not to lie over the fingers. Such structure remarkably reduces the deviation of characteristics of the transducer due to the incomplete alignment of the counter electrode with the interdigital electrode.