Patent ID: 9205657
Filing Date: 2015-12-08
Classification: B41J

Abstract:
1. A liquid ejection head, comprising: a nozzle including a nozzle opening through which liquid is ejected, and a nozzle communication channel communicating at one end thereof with the nozzle opening; a liquid chamber which communicates with another end of the nozzle communication channel; a pressurizing element which is provided on the liquid chamber, the pressurizing element configured to pressurize liquid in the liquid chamber; a plurality of circulation outlets which are formed at the nozzle; a plurality of individual circulation channels which communicate with the nozzle via each of the plurality of circulation outlets; and a common circulation channel at which a plurality of communication ports respectively communicating with the plurality of individual circulation channels are formed, wherein: the nozzle has a structure where the plurality of circulation outlets are arranged symmetrically with respect to a nozzle axis which passes through a barycenter of the nozzle opening and is perpendicular to a nozzle opening surface, and the plurality of individual circulation channels respectively communicating with the plurality of circulation outlets further communicate with a same common circulation channel; the circulation outlets have a structure where flow rates of liquid respectively passing through the circulation outlets when the liquid in the nozzle is circulated to the common circulation channel are equal to each other; and a channel length of the common circulation channel communicating with a plurality of communication ports formed at the same common circulation channel communicating with a plurality of communication ports formed at a same nozzle via the plurality of individual circulation channels respectively communicating with the plurality of communication ports formed at the same nozzle is less than a channel length of the common circulation channel which connects a communication port closest to a communication port formed at the same common circulation channel communicating with other nozzle among the plurality of communication ports to a communication port formed in the same common circulation channel communicating with the other nozzle.