Print head and inkjet printing apparatus

摘要

A print head includes an energy generating element, a chamber for accommodating liquid, and an ejection opening for ejecting liquid from the chamber, thus applying the energy to the liquid in the chamber from the energy generating element to eject the liquid from the ejection opening, wherein the ejection opening includes at least two projections convex to an inside of the ejection opening in a cross section perpendicular to a liquid ejecting direction and has a tapered angle Θ1 in regard to the liquid ejecting direction, enabling a meniscus of the liquid to be formed therebetween at the liquid ejecting time, and an outer edge portion has a tapered angle Θ2 in regard to the liquid ejecting direction, wherein the tapered angles Θ1 and Θ2 are defined to meet a formula of 0°≦Θ1≦10° and a formula of Θ2>Θ1.

主权项

1. A print head comprising:
an energy generating element; a chamber for accommodating liquid to which energy is applied from the energy generating element; and an ejection opening for ejecting the liquid from the chamber to an outside, thus applying the energy to the liquid in the chamber from the energy generating element to eject the liquid from the ejection opening, wherein the ejection opening includes: at least two projections, each of which is convex to an inside of the ejection opening in a cross-section perpendicular to a direction of ejecting the liquid and has a tapered angle Θ1 with respect to the direction of ejecting the liquid, enabling a meniscus of the liquid to be formed therebetween at the time of ejecting the liquid from the ejection opening; and an outer edge portion which is a section of the ejection opening different from the at least two projections and has a tapered angle Θ2 with respect to the direction of ejecting the liquid, wherein the tapered angle Θ1 and the tapered angle Θ2 are defined to meet a formula of 0°≦Θ1≦10° and a formula of Θ2>Θ1.