METHOD FOR FABRICATING WIRING BOARD

摘要

A core material is prepared, wherein the core material has an insulating layer, and a conductor pattern provided on a surface of the insulating layer. One or more prepreg materials are prepared. Each prepreg material includes a glass cloth, and first and second resin layers which are formed from a semi-cured resin with which the glass cloth is impregnated, and cover the opposite surfaces of the glass cloth, respectively. A laminated body is formed by placing the one or more prepreg materials on one another, such that one prepreg material out of the one or more prepreg materials is provided on the surface of the insulating layer of the core material to cover the conductor pattern. The laminated body is heated and pressed. The glass cloth has an opening ratio ranging from 3% to 15%. The thickness t of the first and second resin layers, the ratio a (%) of the area of the conductor pattern to the area of the surface of the insulating layer in the core material, the thickness T of the conductor pattern, and the number n of the one or more prepreg materials satisfy the relationships: T≧100 (μm): and t<(1−a/100)·T<2·n·t.

主权项

1. A method for fabricating a wiring board, comprising:
preparing a core material including an insulating layer and a conductor pattern provided on a surface of the insulating layer; preparing one or more prepreg materials each including a glass cloth having a first surface and a second surface opposite to the first surface, a first resin layer covering the first surface of the glass cloth, and a second resin layer covering the second surface of the glass cloth, the first resin layer and the second resin layer each having a thickness t, and being made of a semi-cured resin with which the glass cloth is impregnated; forming a laminated body by placing the one or more prepreg materials on one another, such that one prepreg material out of the one or more prepreg materials is provided on the surface of the insulating layer of the core material to cover the conductor pattern; and heating and pressing the laminated body; wherein the glass cloth has an opening ratio ranging from 3% to 15%, and wherein the thickness t of the first resin layer and the second resin layer, a ratio a (%) of an area of the conductor pattern to an area of the surface of the insulating layer of the core material, a thickness T of the conductor pattern, and the number not each of the one or more prepreg materials satisfy the relationships:
T≧100 (μm); andt<(1−a/100)·T<2·n·t.