METHOD OF MANUFACTURING MULTILAYER WIRING BOARD AND MULTILAYER WIRING BOARD
PROBLEM TO BE SOLVED: To provide a method of manufacturing a multilayer printed wiring board capable of suppressing an etchback phenomenon and projection of a glass cloth from the via hole wall surface sufficiently, and forming a highly reliable via.SOLUTION: In the method of manufacturing a multila...
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Main Authors | , , , , |
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Format | Patent |
Language | English Japanese |
Published |
19.02.2015
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Subjects | |
Online Access | Get full text |
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Summary: | PROBLEM TO BE SOLVED: To provide a method of manufacturing a multilayer printed wiring board capable of suppressing an etchback phenomenon and projection of a glass cloth from the via hole wall surface sufficiently, and forming a highly reliable via.SOLUTION: In the method of manufacturing a multilayer printed wiring board, a via hole 5 is formed in an insulation layer 4, formed of a prepreg 3 produced by impregnating a glass cloth 1 with a thermosetting resin composition 2, by laser irradiation. The via hole 5 is then subjected to glass etching by a glass etching solution and desmearing by an oxidant solution. With such a configuration, an etchback phenomenon and excessive projection of a glass cloth from the via hole wall surface can be suppressed sufficiently, and a highly reliable via can be formed. In particular, a highly reliable via can be formed even for a small diameter via hole having a top diameter of 75 μm or less.
【課題】エッチバック現象及びビアホール壁面からのガラスクロスの突出を共に十分に抑制でき、信頼性の高いビアを形成することができる、多層プリント配線板の製造方法を提供すること。【解決手段】本発明の多層プリント配線板の製造方法は、ガラスクロス1に熱硬化性樹脂組成物2を含浸させたプリプレグ3により形成された絶縁層4に、レーザー照射によりビアホール5を形成し、該ビアホール5にガラスエッチング溶液によるガラスエッチング処理を施した後、酸化剤溶液によるデスミア処理を施す。かかる構成の採用により、エッチバック現象及びビアホール壁面からのガラスクロスの過大な突出を共に十分に抑制でき、信頼性の高いビアを形成することができ、特に、トップ径75μm以下というような小径のビアホールに対しても高信頼性のビアを形成することができる。【選択図】図1 |
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Bibliography: | Application Number: JP20140233828 |