Patent ID: 7008754

Claim:
A method for manufacturing a circuit substrate comprising the steps of: mixing a photoresist and a circuit material to form a photosensitive paste, applying said photosensitive paste to a surface of a substrate to form a photosensitive paste layer, converging a laser beam emitted from a laser light source to focus a cross section of said laser beam to a dot size of dot pattern composing a circuit pattern, injecting said laser beam into a waveform shaping unit to convert said laser beam to a on-off beam corresponding to said dot pattern by computer signals, reflecting said on-off beam by a surface of a rotating polygon mirror, scanning continuously and repetitiously said on-off beam on a plotted area consisting of exposed and unexposed areas, developing said photosensitive paste layer to form an unsintered circuit pattern by removing said exposed area or said unexposed area, and sintering said unsintered circuit pattern to form a circuit pattern composed of said circuit material.