Production method of suspension board with circuit
A production method of a suspension board with circuit that can provide reduced number of man-hour and complicated processes for forming the ground terminal, to provide production cost reduction. An insulating base layer 4 having a base opening portion 3 is formed on a metal board 2 at a ground terminal 13 forming position, and a thin metal film 5 is formed on the metal board 2 exposed in the base opening portion 3 and on the insulating base layer 4 . Then, a conductive pattern 7 is formed on the thin metal film 5 . Then, an insulating cover layer 9 covering the conductive pattern 7 and having a cover opening portion 8 which correspond in position to the base opening portion 3 is formed on the insulating base layer 4 . Then, a metal board opening portion 11 from which the base opening portion 3 and the insulating base layer 4 around it are exposed is formed in the metal board 2 . Then, an electrolytic plating layer 12 is formed on each side of the conductive pattern 7 exposed in the cover opening portion 8 , feeding electric power from the conductive pattern 7 , and a metal filling layer 14 is formed in the metal board opening portion 11 , to allow the electrolytic plating layer 12 and the metal board 2 to be conductive with each other.
1. A production method of a suspension board with circuit comprising:
the step of preparing a metal board,
the step of forming on the metal board an insulating base layer having a base opening portion from which the metal board is exposed at a ground terminal forming portion thereof,
the step of forming a thin metal film on the metal board exposed in the base opening portion and on the insulating base layer,
the step of forming on the thin metal film a conductive pattern in such a manner as to cover the thin metal film exposed in the base opening portion,
the step of forming on the insulating base layer an insulating cover layer covering the conductive pattern and having a cover opening portion which correspond in position to the base opening portion and from which the conductive pattern is exposed,
the step of forming in the metal board a metal board opening portion from which the base opening portion and the insulating base layer around it are exposed,
the step of forming an electrolytic plating layer on the conductive pattern exposed in the cover opening portion, feeding electric power from the conductive pattern, and
the step of forming a metal filling layer in the metal board opening portion, to allow the electrolytic plating layer and the metal board to be conductive with each other.