Patent ID: 8869401
Filing Date: 2014-10-28
Classification: B41J,Y10T

Abstract:
1. A manufacturing method for a liquid ejection head, wherein the liquid ejection head includes a flow passage wall member having an ejection outlet for ejecting liquid and a liquid flow path in fluid communication with the ejection outlet, said manufacturing method comprising: providing a substrate provided with an organic resin material layer of organic resin material for forming the flow passage wall member; and forming the flow passage wall member by forming the flow path and the ejection outlet by removing partly the organic resin material layer by illuminating the organic resin material layer with a laser beam which has a pulse width of not less than 2 picosec and not more than 20 picosec and which has a focal point inside the organic resin material layer, with movement of the focal point of the laser beam, wherein the ejection outlet is formed by exposure of the organic resin material to the laser beam condensed by a first lens having a numerical aperture of not less than 0.3, and the liquid flow path is formed by exposure of the organic resin material to the laser beam condensed by a second lens having a numerical aperture which is larger than that of the first lens and which is not less than 0.5.