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:
Apr. 16, 2013
Filed:
Mar. 01, 2010
Hiroki Kobayashi, Chiryu, JP;
Yuji Hori, Nagoya, JP;
Yasunori Iwasaki, Kitanagoya, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A composite substrate is provided, including a piezoelectric substrate which is capable of transmitting an elastic wave, and a support substrate, which has a smaller thermal expansion coefficient than that of the piezoelectric substrate, bonded to each other. The in-plane maximum thermal strain amount, which is the largest thermal strain amount in the plane of the composite substrate, has a minimum value and a maximum value when the piezoelectric substrate and the support substrate are relatively rotated 0° to 360°, and the piezoelectric substrate and the support substrate are bonded to each other so that the in-plane maximum thermal strain amount has the minimum value or a value in the vicinity thereof.