Patent ID: 8092702
Filing Date: 2012-01-10
Classification: H01P,Y10T

Abstract:
1. A method of multi-stage substrate etching comprising the steps of: forming a first mask pattern on any one surface of a first substrate; wherein the step of forming the first mask pattern comprises the steps of: applying an oxide layer onto the first substrate; performing a photoresist-coating onto any one surface of the first substrate applied with the oxide layer, and forming an alignment key pattern on the photoresist-coated surface; and forming the first mask pattern on a surface of the first substrate that is opposed to the photoresist-coated surface; forming a hole by etching the first substrate using the first mask pattern as an etching mask; bonding, to the first substrate, a second substrate having the same thickness as a depth to be etched; the second substrate being bonded to the first substrate on a surface of the first substrate that comprises the hole; forming a second mask pattern on the second substrate after the second substrate is bonded to the first substrate; forming a hole by etching the second substrate using the second mask pattern as an etching mask; and removing an oxide layer having etching selectivity between the first substrate and the second substrate.