Patent ID: 7280716

Claim:
A method of producing a printed circuit board in which a waveguide is embedded, comprising: a first step of forming a circuit pattern and a target image for alignment on a substrate; a second step of forming a lower clad layer on the substrate on which the circuit pattern and target image for alignment are formed; a third step of forming a core layer from which the waveguide with a predetermined shape is to be formed, on the lower clad layer; a fourth step of aligning an exposing film on which a waveguide pattern with a predetermined shape is formed, on the core layer using the target image formed on the substrate; a fifth step of exposing the core layer by UV using the exposing film on which the waveguide pattern is formed, to form the waveguide for a large area on the lower clad layer; and a sixth step of forming an upper clad layer on the core layer from which the waveguide is formed.