Patent ID: 9705066
Date: 2017-07-11
CPC Classifications: B41J,H01L

Claim:
1. A head comprising: an actuator substrate which has two piezo element rows arranged in a second direction which intersects with a first direction, each of the piezo element rows being formed of piezo elements arranged in the first direction, the piezo element causing a pressure change to occur in a pressure generating chamber communicating with a nozzle opening for ejecting a liquid; a driving circuit board which is provided with a driving circuit for driving the piezo element on a second main surface on the side opposite to a first main surface facing the actuator substrate; and a first bump and a second bump which are provided on any one of the actuator substrate and the driving circuit board, wherein the first bump is provided on the outside of the piezo element row in the second direction, wherein an adhesive layer which bonds the actuator substrate to the driving circuit board is provided on at least both sides of the first bump in the second direction, wherein the piezo element includes an individual electrode which is independently provided corresponding to the pressure generating chamber, a common electrode which is common to the piezo element row, and a piezoelectric layer which is provided between the common electrode and the individual electrode, wherein a plurality of first through holes, which communicate with the first main surface and the second main surface, are provided for each individual electrode, and at least one second through hole, which communicates with the first main surface and the second main surface is provided, corresponding to the common electrode, on the driving circuit board, wherein a first connection wiring and a second connection wiring which connect the driving circuit and the piezo element are provided in the first through hole and the second through hole, and wherein the individual electrode and the first connection wiring are electrically connected through the first bump, and the common electrode and the second connection wiring are electrically connected through the second bump, wherein the adhesive layer is provided on both sides of the second bump in the second direction.