公开(公告)号：US10181556B2

公开(公告)日：2019-01-15

申请号：US15086786

申请日：2016-03-31

申请人： NGK INSULATORS, LTD.

发明人： Akifumi Morishita ,  Tomohiko Hibino

IPC分类号： H01L41/08 ,  H01L41/187 ,  C04B35/472 ,  H01L41/43 ,  B32B18/00 ,  C04B35/493 ,  C04B35/499 ,  C04B35/626

摘要： A piezoelectric/electrostrictive material is composed of Mn and a compound of Pb(Zn, Nb)O3—Pb(Ni, Nb)O3—Pb(Zr, Ti)O3. A ratio of a molar amount of Mn relative to a sum of respective molar amounts of Ni, Zn, Ti, Zr, Nb and Mn is at least 0.001 to no more than 0.015. A ratio of a molar amount of Nb relative to a sum of respective molar amounts of Ni and Zn is at least 2.007 to no more than 2.125.

公开(公告)号：US10790437B2

公开(公告)日：2020-09-29

申请号：US15472615

申请日：2017-03-29

申请人： NGK INSULATORS, LTD.

发明人： Masayuki Uetani ,  Tomohiko Hibino ,  Akifumi Morishita

IPC分类号： H01L41/187 ,  B32B18/00 ,  C04B35/491 ,  H01L41/047 ,  H01L41/09 ,  H01L41/113

摘要： A piezoelectric element includes a piezoelectric body having a main phase configured by lead zirconate titanate and a heterogenous phase configured by a different component to lead zirconate titanate, and a pair of electrodes provided on the piezoelectric body. The piezoelectric body has a surface region within 10 μm of a surface, and an inner region more than 10 μm from the surface. A surface area coverage of the heterogenous phase in a cross section of the surface region is at least 0.75% greater than a surface area coverage of the heterogenous phase in a cross section of the inner region.

公开(公告)号：US10749099B2

公开(公告)日：2020-08-18

申请号：US15473989

申请日：2017-03-30

申请人： NGK INSULATORS, LTD.

发明人： Masayuki Uetani ,  Takatomo Ogata ,  Akifumi Morishita

IPC分类号： H01L41/047 ,  H01L41/083 ,  H01L41/297

摘要： The piezoelectric element comprises a piezoelectric body extending in a lateral direction and a first and second electrodes that are provided on the piezoelectric body. The piezoelectric body has an active portion sandwiched between the first and second electrodes in a thickness direction that is vertical to the lateral direction, and an inactive portion connected to the active portion in the lateral direction. The first electrode has an active electrode portion disposed on the active portion. The active electrode portion includes an interface region that is adjacent to the interface of the active portion and the inactive portion in the lateral direction, and an inner region that is separated from the interface of the active portion and the inactive portion in the lateral direction. The cross sectional surface area per unit length of the interface region in the cross section of the active electrode portion is greater than the cross sectional area per unit length of the inner region.