Patent ID: 6551697
Filing Date: 2003-04-22
Classification: B32B,H05K,Y10T

Abstract:
A printed circuit board comprising:a base substrate including a conductive circuit pattern on a surface thereof; and at least one photosensitive resin layer provided on said base substrate and positioned substantially over said conductive circuit pattern, said printed circuit board being formed by exposing said photosensitive resin layer on said conductive circuit pattern with an exposure amount in accordance with a predetermined area of said conductive circuit pattern, said area of said conductive circuit pattern is performed by the use of a photomask in which a light shielding portion of a fine pattern is formed in a portion corresponding to a portion of said conductive circuit pattern, and a film thickness difference of said photosensitive resin layer from the surface of the base substrate after the exposure is set to be 5 micrometers or less.