Patent ID: 6878296
Filing Date: 2005-04-12
Classification: H05K,Y10T

Abstract:
1. A surface-processing method for a multilayer printed wiring board comprising the steps of: etching the surface of a conductor pattern formed on at least one outer layer of a printed wiring board; rinsing the surface of the printed wiring board the conductor pattern of which has been etched by said etching step; removing air bubbles affixed to the surface of the printed wiring board by immersing the printed wiring board rinsed by said first rinsing step in a water-soluble pre-flux liquid in a processing vessel; forming a pre-flux film on said conductor pattern of said outer layer of said printed wiring board in the pre-flux liquid, freed of air bubbles, using an in-liquid spray provided in said pre-flux liquid in said processing vessel; removing the pre-flux liquid from the surface of said printed wiring board carrying said pre-flux film and transferred from said processing vessel; and rinsing the surface of said printed wiring board from the surface of which said pre-flux liquid has been removed by said liquid removing step.