Patent ID: 7586754
Filing Date: 2009-09-08
Classification: H05K,Y02P,Y10T

Abstract:
1. A printed wiring board comprising: a conductive wiring which is formed on a surface of a board and has a plurality of solder lands, to which components to be mounted are electrically connected by solder; and first and second electrically insulating layers formed on the conductive wiring, wherein the first insulating layer is formed on the conductive wiring in such a manner that the first insulating layer covers a portion of a peripheral part of one solder land and a central part of the one solder land is exposed, said first insulating layer extending from one edge portion of said one solder land to another edge portion of another solder land, and wherein the second insulating layer is piled up on the first insulating layer which covers the portion of the peripheral part of the one solder land, but not completely covering said first insulating layer.