Patent ID: 7732900
Filing Date: 2010-06-08
Classification: G11B,H01L,H05K,Y10T

Abstract:
1. A wired circuit board comprising a base insulating layer, a conductive pattern formed on the base insulating layer, and a cover insulating layer formed so as to cover the conductive pattern, wherein the conductive pattern includes terminals to be connected with external terminals through solidified molten metal, wherein first through holes to be filled with the solidified molten metal are formed in the terminals to extend through the terminals in a thickness direction thereof, wherein second through holes, which overlap with the first through holes so as to communicate with the first through holes in a thickness direction thereof, are formed in the base insulating layer at portions thereof corresponding to the terminals to extend through the base insulating layer in the thickness direction, wherein openings, which overlap with the first through holes so as to communicate with the first through holes in a thickness direction thereof, are formed in the cover insulating layer at portions thereof corresponding to the terminals to extend through the cover insulating layer in the thickness direction, wherein the first through holes are located between the openings and the second through holes in the thickness direction, wherein a diameter of each of the second through holes and a diameter of each of the openings are larger than a diameter of each of the first through holes, wherein a first level difference is formed between an inner surface of each of the first through holes in each of the terminals and an inner surface of each of the openings in the cover insulating layer, such that a first surface of each of the terminals extending orthogonal to the thickness direction forms a first ledge with respect to the inner surface of a corresponding one of the first through holes, and wherein a second level difference is formed between the inner surface of each of the first through holes in each of the terminals and an inner surface of each of the second through holes in the base insulating layer, such that a second surface of each of the terminals extending orthogonal to the thickness direction forms a second ledge with respect to the inner surface of a corresponding one of the second through holes.