Patent ID: 7009117

Claim:
A circuit board including: a substrate; at least one circuit pattern provided on opposite sides of said substrate; an anti-soldering layer provided on said at least one circuit pattern on one side of said substrate to prevent soldering material from sticking to said at least one circuit pattern; at least one silk-screen printing area provided on said anti-soldering layer to indicate where a selected electric or electronic part or device is to be mounted; at least one terminal hole formed in said substrate at a center of said at least one silk-screen printing area; a conductor layer formed on an inner circumference of said at least one terminal hole; a substrate-exposed zone provided on said one side of said substrate, said substrate-exposed zone being free of said at least one circuit pattern, said anti-soldering layer and said at least one silk-screen printing area, such that said one side of said substrate is exposed in said substrate-exposed zone; wherein said substrate-exposed zone is a contiguous substrate-exposed zone that extends continuously across a portion of said one side of said substrate and between portions of said at least one silk-screen printing area so as to extend across said center of said at least one silk-screen printing area where said at least one terminal hole is formed.