Patent ID: 7084073

Claim:
A method of forming a via hole through a glass wafer, comprising: depositing a first material layer on front and rear surfaces of the glass wafer; depositing a second material layer on the first material layer; forming a via pattern in the second material layer; performing a first etching using the via pattern to form a hole passing through the first material layer on the front surface of the glass wafer and a preliminary via hole in the glass wafer, wherein the preliminary via hole does not pass completely through the glass wafer; eliminating the second material layer; performing a second etching in which the preliminary via hole is etched to form a blind via hole having a smooth surface and extending through the glass wafer but not through the first material layer on the rear surface of the glass wafer, such that the first material layer on the rear surface of the glass wafer is exposed through the blind via hole; and eliminating the first material layer, such that the blind via hole is transformed into a through hole.