Patent ID: 9573371
Date: 2017-02-21
CPC Classifications: B41J

Claim:
1. A head comprising: a channel formation substrate that is provided with a pressure generating chamber which communicates with a nozzle for ejecting a liquid; a piezo element that is provided on one surface side of the channel formation substrate; and a driving circuit board that is bonded to the one surface side of the channel formation substrate via an adhesive layer, and is provided with a driving circuit for driving the piezo element, wherein the piezo element and the driving circuit are electrically connected to each other via a bump which is provided on any one of the channel formation substrate and the driving circuit board, wherein a holding portion which is surrounded by the adhesive layer and holds the piezo element therein is provided between the driving circuit board and the channel formation substrate, and wherein the holding portion is opened to an atmosphere through an atmosphere open passage which is provided to penetrate the driving circuit board in a direction in which the driving circuit board and the channel formation substrate are stacked, wherein the holding portion includes a first holding portion and a second holding portion, wherein the first holding portion, which is surrounded by the adhesive layer and holds the piezo element therein, is provided between the driving circuit board and the channel formation substrate, wherein the second holding portion, which is surrounded by the adhesive layer and holds the bump therein, is provided between the driving circuit board and the channel formation substrate, wherein the first holding portion is opened to the atmosphere through the atmosphere open passage.