Patent ID: 7762649
Filing Date: 2010-07-27
Classification: B41J

Abstract:
1. A printing head mounted at a location capable of moving relative to a printing medium and capable of printing an image on the printing medium by ejecting a liquid from an ejection port of a tip of a nozzle while moving relative to the printing medium, wherein the nozzle includes an electro-thermal converter that heats the liquid to generate a bubble, the nozzle being configured to eject the liquid from the ejection port by pressure generated by the bubble and to divide the liquid ejected from the ejection port into a main-droplet and a sub-droplet, wherein an ejection port face, where the ejection port is located, has a normal line that intersects with an axis line of the nozzle at a predetermined angle so that the ejection port face inclines in a relative moving direction of the printing head with the printing medium as a reference, wherein the main-droplet is formed by the liquid near the ejection port and is ejected along the normal line of the ejection port face, and wherein the sub-droplet is formed by the liquid at a location away from the ejection port and is ejected along the axis line of the nozzle.