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:
Jul. 02, 2019
Filed:
Mar. 05, 2015
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Hisashi Kozuka, Ichinomiya, JP;
Hideto Yamada, Komaki, JP;
Takayuki Matsuoka, Aichi, JP;
Kazuaki Kitamura, Ise, JP;
Masato Yamazaki, Komaki, JP;
Toshiaki Kurahashi, Konan, JP;
Takashi Kasashima, Ichinomiya, JP;
Yasuyuki Okimura, Inuyama, JP;
Kazushige Ohbayashi, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A lead-free piezoelectric ceramic composition including an alkali niobate/tantalate perovskite oxide main phase having piezoelectric properties and a different metal oxide subphase. The mole ratio (Na/K) between Na (sodium) and K (potassium) in the main phase assumes a value in a range represented by 0.40<(Na/K)<3.0. The main phase has a crystal structure in which (i) first spots corresponding to a primitive lattice period and (ii) second spots corresponding to the lattice period two times the primitive lattice period and being weaker than the first spots appear in an electron beam diffraction image entering from the <100> direction with the main phase represented as a pseudo-cubic crystal system.