Patent ID: 9686868
Date: 2017-06-20
CPC Classifications: C23C,H05K

Claim:
1. A method of removing a soluble material layer formed on a surface of a base material comprising: dissolving the soluble material layer, wherein: a surface of the base material has a concave part, which is defined by a ring-shaped step that follows an outer edge of a region on which to form the soluble material layer, the soluble material layer being formed in the concave part and an upper surface of the ring-shaped steps; bringing an elastic member into contact with a portion of the soluble material layer, the portion being in the concave part; then, pressing and deforming the elastic member so that a whole of an angular portion, at which the upper surface of the ring-shaped step and a side surface of the ring-shaped step cross, bites into the elastic member and that the elastic member and the soluble material layer on the upper surface of the ring-shaped step are separated from each other; and then, immersing the base material in a liquid that is capable of dissolving the soluble material layer while the elastic member is kept deformed.