Patent ID: 8597529
Filing Date: 2013-12-03
Classification: B41J

Abstract:
1. A method for processing a substrate, the method comprising: preparing a substrate having a sacrificial layer, a first layer, and an electric layer at a first surface side thereof, the sacrificial layer comprising at least one of aluminum, aluminum-silicon, aluminum-copper, and aluminum-silicon-copper, the first layer comprising a material capable of suppressing transmission of laser light, and the sacrificial layer being disposed closer to the substrate than the first layer; processing the substrate with laser light from a second surface that is opposite the first surface of the substrate toward the first surface of the substrate, and allowing the laser light to penetrate the sacrificial layer to reach the first layer to form a hole in the substrate; and performing etching of the substrate from the second surface through the hole, wherein the first layer and the electric layer are formed in simultaneous steps.