Patent ID: 8450616
Filing Date: 2013-05-28
Classification: H05K,Y10T

Abstract:
1. A circuit board, having a removing area, the circuit board comprising: a first dielectric layer; a first laser resistant structure for blocking a laser beam to prevent the laser beam from etching a dielectric layer below the first laser resistant structure, disposed on a first surface of the first dielectric layer and located at a periphery of the removing area; a second dielectric layer, disposed on the first dielectric layer and covering the first laser resistant structure; a circuit layer, disposed on a second surface of the second dielectric layer, wherein a portion of the circuit layer is extended from outside of the removing area into the removing area; a second laser resistant structure for blocking the laser beam to prevent the laser beam from etching a dielectric layer below the second laser resistant structure, disposed on the second surface, located at the periphery of the removing area, and insulated from the circuit layer, wherein the second laser resistant structure is an annular structure, there is at least one gap between the second laser resistant structure and the circuit layer, the circuit layer is extended from the gap into the removing area, and a vertical projection of the gap on the first surface overlaps the first laser resistant structure; and a third dielectric layer, disposed on the second dielectric layer, and having an opening corresponding to the removing area, wherein the opening exposes a portion of the circuit layer located within the removing area and the third dielectric layer covers a portion of the second laser resistant structure.