Patent ID: 7594317
Filing Date: 2009-09-29
Classification: H01L,H05K,Y10T

Abstract:
1. A method of manufacturing a wiring substrate comprising the steps of: (a) obtaining a temporary substrate, without using any adhesive layer, by providing an adhesive prepreg to constitute the temporary substrate, the prepreg being in a semi-hardened state and having an adhesive function, placing a metal foil onto at least one surface of the prepreg with an underlying layer therebetween the underlying layer being placed within a wiring formation region of the prepreg, the metal foil having a size larger than that of the underlying layer and directly contacting an outer peripheral portion of the wiring formation region of the prepreg, and hardening the prepreg having the adhesive function with beating and pressurization, thereby obtaining the temporary substrate from the prepreg without using any adhesive layer, and concurrently attaching the metal foil onto the temporary substrate; (b) forming a build-up wiring layer on the metal foil; (c) obtaining a wiring member in which the build-up wiring layer is formed on the metal foil, by cutting out a portion of structure in which the underlying layer, the metal foil and the build-up wiring layer are formed on the temporary substrate, the portion corresponding to the outer peripheral portion of the underlying layer, and (d) separating the metal foil from the temporary substrate.