Patent ID: 7192879

Claim:
A method for manufacturing a micro-structural unit by performing machining on a material substrate which has a laminated structure comprising a first conductive layer, a second conductive layer, a third conductive layer, a first insulating layer interposed between the first conductive layer and the second conductive layer, and a second insulating layer interposed between the second conductive layer and the third conductive layer, the first conductive layer having an outer surface directed away from the second and third conductive layers, the method comprising: a first etching step for performing an etching treatment on the first conductive layer via a first mask pattern and a second mask pattern formed on said outer surface of the first conductive layer until the first insulating layer is reached from said outer surface of the first conductive layer; a second etching step for performing an etching treatment on portions of the first insulating layer that are exposed in the first etching step, the etching treatment being continued until the second conductive layer is reached from said outer surface of the first conductive layer; a step for removing the second mask pattern; and a third etching step for performing an etching treatment on the first conductive layer from said outer surface via the first mask pattern, and for performing an etching treatment into the second conductive layer beyond the first insulating layer on portions of the second conductive layer that are exposed in the second etching step.