Patent ID: 7875805
Filing Date: 2011-01-25
Classification: H05K

Abstract:
1. A warpage-proof circuit board structure, comprising: an inner layer circuit board; at least one dielectric layer formed on at least one surface of the inner layer circuit board and at least one first groove formed in the at least one dielectric layer corresponding in position thereto; solder mask formed on the surface of the dielectric layer, a second groove formed in the solder mask and corresponding in position to the first groove in the dielectric layer; a metal frame formed in the first and second grooves and protruding out of the surface of the solder mask, wherein the metal frame includes a first metal frame formed in the dielectric layer and a second metal frame formed in the solder mask; a first electrical conductive layer formed between the dielectric layer and the first metal frame; and a second electrical conductive layer formed between the solder mask and the second metal frame.