US 12,245,511 B2
Piezoelectric ceramic electronic component
Yasunari Miwa, Nagaokakyo (JP); Hiroyuki Sumioka, Nagaokakyo (JP); Hiroyuki Hayashi, Nagaokakyo (JP); and Hirozumi Ogawa, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Oct. 22, 2021, as Appl. No. 17/508,567.
Application 17/508,567 is a continuation of application No. PCT/JP2020/011940, filed on Mar. 18, 2020.
Claims priority of application No. 2019-091326 (JP), filed on May 14, 2019.
Prior Publication US 2022/0052252 A1, Feb. 17, 2022
Int. Cl. H10N 30/853 (2023.01); H10N 30/00 (2023.01); H10N 30/097 (2023.01); H10N 30/50 (2023.01)
CPC H10N 30/8542 (2023.02) [H10N 30/097 (2023.02); H10N 30/50 (2023.02); H10N 30/704 (2024.05)] 12 Claims
OG exemplary drawing
 
1. A piezoelectric ceramic electronic component comprising:
a piezoelectric ceramic body including at least one piezoelectric ceramic layer; and
a plurality of electrodes on a surface of or inside the piezoelectric ceramic body and arranged so that the at least one piezoelectric ceramic layer is sandwiched between adjacent electrodes of the plurality of electrodes,
wherein
the at least one piezoelectric ceramic layer is a ceramic sintered body containing a potassium sodium niobate-based compound and Mn, and
when the at least one piezoelectric ceramic layer sandwiched between the adjacent electrodes is divided into three equal parts in a thickness direction to sequentially define a first region, a second region, and a third region between the adjacent electrodes, a second Mn concentration in the second region is higher than a first Mn concentration in the first region and a third Mn concentration in the third region.