Patent ID: 7579251

Claim:
A method of fabricating a circuit substrate, said circuit substrate having any of a passive element and an interconnection pattern, said passive element comprising at least one of a dielectric film, a resistance film and a conductor film, said method comprising a film forming step, said film forming step forming at least one of said dielectric film, said resistance film and said conductor film by generating and ejecting dry aerosol consisting essentially of a fine solid particle material together with a carrier gas, said dry aerosol being ejected into a reduced pressure environment of a pressure lower than a pressure in an aerosol generator generating said dry aerosol, with a speed of 200-400 m/second such that said fine solid particle material causes impact activation upon impact upon said circuit substrate, said film forming step for forming at least one of said dielectric film, said resistance film and said conductor film being conducted by generating and ejecting dry aerosol of a fine and brittle solid particle material together with said carrier gas, said fine and brittle solid particle material being selected from one or more of the group consisting of: TiO 2 , MgO, SiO 2 , AlN, Al 2 O 3 , PbTiO 3 , PbZrO 3 , Pb(Zr 1−x Ti x )O 3 (0≦x≦1), (Pb 1−y La y )(Zr 1−x Ti x O 3 (0≦x, y≦1), Pb(Mg 1/3 Nb 2/3 )O 3 , Pb(Ni 1/3 Nb 2/3 )O 3 , Pb(Zn 1/3 Nb 2/3 )O 3 , BaTiO 3 , BaTi 4 O 9 , Ba 2 Ti 9 O 20 , Ba(Zn 1/3 Ta 2/3 )O 3 , Ba(Zn 1/3 Nb 2/3 )O 3 , Ba(Mg 1/3 Ta 2/3 )O 3 , Ba(Mg 1/3 Ta 2/3 )O 3 , Ba(Co 1/3 Ta 2/3 )O 3 , Ba(Co 1/3 Nb 2/3 )O 3 , Ba(Ni 1/3 Ta 2/3 )O 3 , Ba(Zr 1−x Ti x )O 3 , and (Ba 1−x Sr x )TiO 3 , said step of generating said dry aerosol of said fine solid particle material including a step of heating a powder of said fine solid particle material.