Loading patent…
AssigneesShinko Electric Industries Co., Ltd., Mitsubishi Paper Mills Limited
InventorsKatsuya Fukase, Toyoaki Sakai, Munetoshi Irisawa, Toyokazu Komuro, Yasuo Kaneda, Masanori Natsuka, Wakana Aizawa
Estimating the term…
As means for solving a problem of a positional shift of a land and a hole which is caused by an alignment in the formation of an etching resist layer and a plated resist layer in a method of manufacturing a circuit board, there are provided a method of manufacturing a circuit board including the steps of forming a first resin layer on a surface of an insulating substrate having a conductive layer on the surface and an internal wall of a through hole or/and a non-through hole, forming a second resin layer which is insoluble or slightly soluble in a developing solution for the first resin layer on the first resin layer provided on the surface conductive layer, and removing the first resin layer provided over the hole with the developing solution for the first resin layer, and a method of manufacturing a circuit board including the step of uniformly charging a surface of the first resin layer to induce a potential difference to the first resin layer provided over the hole and the first resin layer provided on the surface conductive layer before forming the second resin layer. Moreover, there is provided a circuit board having a hole with a small positional shift and high precision.
A circuit board in which a circuit portion is formed on an insulating substrate by a conductive layer and there provided a through hole and/or a non-through hole having an internal wall covered or filled with the conductive layer, wherein a land of the through hole and/or the non-through hole is formed continuously like a concentric circle with respect to the hole, a maximum height of the conductive layer in a non-coupling portion of the land is equal to or greater than −5 μm with a corner portion of the insulating substrate set to be a reference point and is equal to or smaller than a thickness of the conductive layer in a circuit portion, and a land width from the reference point is 0 to 40 μm,
Dependencies are inferred from the claim text.