Patent ID: 7776199
Filing Date: 2010-08-17
Classification: H05K

Abstract:
1. A production method of a printed wiring board, comprising: a resist layer formation step of forming a resist layer on a conductive seed layer of a insulator substrate; a photo lithography step of carrying out exposure and development to the resist layer so as to form a resist being patterned for plating on a seed layer of a substrate composed of an insulator substrate having a conductive layer; a plating step of electro-plating a portion of the conductive seed layer, from the portion the resist layer being removed in the photo lithography step, so as to form a conductive circuit; a resist removing step of removing the resist being patterned; an additional plating step of filling an undercut portion of the conductive circuit by electro-plating to form an additional plating layer; and a removing step of removing at least a portion of the additional plating layer.