Patent ID: 9566785
Date: 2017-02-14
CPC Classifications: B41J

Claim:
1. A liquid ejection head comprising: a substrate having a plurality of pressure chambers formed therein, the pressure chambers having respective ejection ports for ejecting liquid; a common liquid chamber communicating with the plurality of pressure chambers; and a plurality of energy generating elements arranged respectively in the plurality of pressure chambers to generate energy necessary for ejecting liquid from the respective ejection ports, the liquid being supplied from the common liquid chamber to the pressure chambers, wherein the common liquid chamber has a first surface, the first surface being a wall surface located at a substrate side, and a second surface located vis-à-vis the first surface, the second surface having an inclined portion inclined relative to the first surface by a predefined inclination angle, the liquid ejection head being configured to cause pressure waves generated as a result of sequentially driving the plurality of energy generating elements with a predefined time difference to propagate from respective starting points on the first surface of the common liquid chamber located at the substrate side, the starting points corresponding to the positions of the respective energy generating elements, in a direction perpendicular to the first surface so as to be reflected by the second surface of the common liquid chamber and returned to respective end points on the first surface such that each pressure wave propagates from the starting point to the end point in a propagation time either shorter or longer than the predefined time difference, and wherein the propagation time t where L