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. 20, 2002
Filed:
Dec. 27, 1999
Michiaki Nishimura, Kokubu, JP;
Kousei Kamigaki, Kokubu, JP;
Ken-ichi Yoshimura, Kokubu, JP;
Hirotaka Tsuyoshi, Kokubu, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
A piezoelectric resonator having a resonator element in or on a substrate, said resonator element comprising a laminate of a plurality of piezoelectric ceramic layers and a plurality of electrode layers which are alternately laminated one upon the other, the piezoelectric ceramic layers neighboring up and down being set to oscillate in opposite phases relative to each other. In the piezoelectric resonator, the piezoelectric ceramic layers neighboring up and down undergo the thickness longitudinal oscillation in opposite phases, suppressing the oscillation of the fundamental mode and strongly exciting the oscillation of a mode of a high degree of not lower than the second degree. The piezoelectric resonator utilizing the mode of a high degree of not lower than the second degree is little affected by spurious caused by the oscillation of the fundamental mode.