Patent ID: 9579891
Date: 2017-02-28
CPC Classifications: B41J

Claim:
1. A liquid jetting apparatus comprising: a flow passage structure having nozzles aligned in a first direction, pressure chambers aligned in the first direction to correspond respectively to the nozzles, and a vibration film covering the pressure chambers; piezoelectric elements arranged on the vibration film of the flow passage structure to correspond respectively to the pressure chambers; and traces extending along a planar direction of the vibration film of the flow passage structure to correspond respectively to the piezoelectric elements, wherein each of the pressure chambers is formed in a shape elongated in a second direction intersecting the first direction such that each of the pressure chambers is longer in the second direction than the first direction, liquid supply holes for supplying liquid respectively to the pressure chambers are formed in portions, of the vibration film, covering end portions of the pressure chambers on one side in the second direction respectively, each of the piezoelectric elements has a piezoelectric film arranged to cover one of the pressure chambers, and an individual electrode provided on the piezoelectric film to face a central portion of the one of the pressure chambers and extending in the second direction, each of the traces corresponding to one of the piezoelectric elements is superimposed on a connecting portion provided in an end portion, of the individual electrode, on the one side in the second direction to be electrically connected with the individual electrode, and within each area, of the vibration film, facing one of the pressure chambers and disposed on the one side in the second direction with respect to the connecting portion, each of the traces extends from the connecting portion toward an outer side of the area along a third direction intersecting the second direction, wherein within the area of the vibration film, each of the traces has a first part extending from the connecting portion to the one side in the second direction, a second part extending from the first part toward the outer side of the area along the third direction, and a third part arranged symmetrically with the second part with respect to the first part.