| CPC B41J 2/14233 (2013.01) | 16 Claims |
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1. A liquid ejecting head comprising:
a diaphragm including a first surface and a second surface opposite to the first surface;
a piezoelectric element disposed on the first surface; and
a partition wall disposed on the second surface to partition a pressure chamber communicating with a nozzle, wherein
the piezoelectric element includes a first electrode layer, a piezoelectric layer, and a second electrode layer,
the first electrode layer, the piezoelectric layer, and the second electrode layer are laminated in this order on the first surface,
the pressure chamber has an elongated shape when viewed in a thickness direction of the diaphragm,
in a structure including the diaphragm and the piezoelectric element, an active portion is a portion where the pressure chamber, the first electrode layer, the piezoelectric layer, and the second electrode layer are all overlapped when viewed in the thickness direction of the diaphragm,
in the structure, a non-active portion is a portion that is overlapped with the pressure chamber at a position different from the active portion and that is adjacent to the active portion in a lateral direction of the pressure chamber when viewed in the thickness direction of the diaphragm,
a first position is a position on an inner side of the active portion when viewed in the thickness direction of the diaphragm,
a second position is a position on an inner side of the non-active portion and closest to a boundary between the pressure chamber and the partition wall when viewed in the thickness direction of the diaphragm, and
EI1/EI2≤40, wherein
EI1 is a bending rigidity of the active portion at the first position and
EI2 is a bending rigidity of the non-active portion at the second position.
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