Patent ID: 9450168
Filing Date: 2016-09-20
CPC Classification: H01L

Claim Text:
1. A multilayer piezoelectric device comprising: a multilayer body formed from a plurality of piezoelectric layers stacked along a first direction, and having a base, a non-driving part and first and second driving parts, wherein the non-driving part and first and second driving parts extend in the same first direction from the base; and first and second outer electrodes arranged on a surface of the multilayer body while being electrically insulated from each other; wherein the first and second driving parts and non-driving part align along a second direction orthogonal to the first direction such that the first driving part is closer to the non-driving part than is the second driving part; wherein each of the first and second driving parts has first and second inner electrodes opposing each other in the first direction through the piezoelectric layer interposed therebetween; wherein the base has a third inner electrode extending along a plane orthogonal to the first direction; wherein the first inner electrode is electrically connected to the first outer electrode but electrically insulated from the second outer electrode; wherein the second and third inner electrodes are electrically connected to the second outer electrode but electrically insulated from the first outer electrode; wherein the second inner electrodes of the first and second driving parts are each adjacent to the third inner electrode in the first direction and partly overlap the third inner electrode as seen in the first direction; and wherein a first area where the third inner electrode and the second inner electrode of the first driving part overlap each other is greater than a second area where the third inner electrode and the second inner electrode of the second driving part overlap each other as seen in the first direction.