Patent ID: 8198017
Filing Date: 2012-06-12
Classification: H05K

Abstract:
1. A producing method of a wired circuit board, the producing method comprising the steps of: preparing a two-layer base material in which a synthetic resin insulating layer is laminated on a metal supporting layer formed of a metal foil; covering an upper surface of the insulating layer and respective side end surfaces of the insulating layer and the metal supporting layer with a photoresist; placing a photomask so as to light-shield an end portion where an end-portion conductive layer is to be formed on the upper surface of the insulating layer and a portion where a conductive layer is to be formed on the upper surface of the insulating layer, and exposing to light the photoresist covering the upper surface of the insulating layer from above the photoresist via the photomask; exposing to light the photoresist covering the respective side end surfaces of the insulating layer and the metal supporting layer from below the photoresist; forming an exposed portion of the photoresist into a pattern by removing an unexposed portion thereof to form a plating resist; forming said end-portion conductive layer on the end portion of the upper surface of the insulating layer which is exposed from the plating resist, while simultaneously forming said conductive layer on the portion of the upper surface of the insulating layer which is exposed from the plating resist; and removing the plating resist.