Patent ID: 9178294
Filing Date: 2015-11-03
Classification: H01R,H05K

Abstract:
1. A printed circuit board in which three or more layers of circuit boards are laminated and a large number of through holes for insertion of terminal pins of electronic parts are formed, wherein lands of a conductor material are formed around a first through hole and a second through hole of the large number of through holes on surfaces of a top layer circuit board and a bottom circuit board, and the first land around the first through hole and the second land around the second through hole formed on the side of the top layer circuit board are electrically connected to the land around the first through hole and the land around the second through hole formed on the side of the bottom layer circuit board via a conductor member formed on an inner wall surface of the first through hole or a conductor member formed on an inner wall surface of the second through hole, wherein, in a circuit board held between the top layer circuit board and the bottom layer circuit board, a first conductor film connected to the conductor member formed on the inner wall surface of the first through hole and a second conductor film connected to the conductor member formed on the inner wall surface of the second through hole, and a third conductor film, held between the first conductor film and the second conductor film, not electrically connected to the first conductor film and the second conductor film, are formed, and wherein, when the printed circuit board is viewed from an upper surface, in a region from the first through hole to the second through hole, any one of the first land and the second land, the first conductor film and the second conductor film, and the third conductor film, exists in a width equal to or wider than a diameter of the first through hole and the second through hole.