Patent ID: 6979644

Claim:
A method of manufacturing an electronic circuit component, comprising the steps of: (a) forming a first thin film circuit element on a surface of a circuit board using an Si substrate; (b) forming a hole or trench going through a portion of a thickness of said Si substrate by etching from the surface of said circuit board; (c) forming an insulating film covering a surface of said formed hole or trench; (d) adhering a dry film of photoresist to the insulating film, said dry film capping an opening of said hole or trench; (e) patterning said dry film; (f) etching said insulating film by using said patterned dry film as a mask; (g) swelling said dry film to remove said dry film (h) forming a conductor pattern in said hole or trench; (i) removing a portion of the thickness of said Si substrate from a bottom surface side to expose said conductor pattern in said hole or trench; and (j) forming an insulating film on an Si surface exposed on the bottom surface of said circuit board.