Patent ID: 6757973
Filing Date: 2004-07-06
Classification: B41J,Y10T

Abstract:
A method for forming a throughhole in an ink-jet print head, comprising the steps of:(a) forming a bubble-generator, including a heater, adjacent to a throughhole-forming region on one side of a substrate; (b) forming a first mask layer for covering portions, excluding the throughhole-forming region, on a first side of the substrate; (c) forming a second mask layer for covering portions, excluding the throughhole-forming region, on a second side of the substrate; (d) forming a third mask layer on the first mask layer and forming a fourth mask layer on the second mask layer; (e) forming a first well having a predetermined depth on the throughhole-forming region of the substrate not covered by the first mask layer by spraying sand under high pressure and at high speed onto the first side of the substrate; (f) forming a second well corresponding to the first well on the throughhole-forming region of the substrate not covered by the second mask layer by spraying sand under high pressure and at high speed onto the second side of the substrate; and (g) forming a throughhole by overlap of the first well and the second well on the throughhole-forming region.