FINE FEATURED ELECTRICAL CIRCUITS

摘要

A method of forming electrical circuits is described by the process of electroless deposition of conductive material onto a substrate having receptive and non-receptive areas such that the conductive material is deposited on the receptive areas and not on the non-receptive areas thereby forming a desired conductor pattern, comprising sequentially the steps of: i) taking a substrate comprising a receptive body (1) formed of insulating material receptive to, or treatable so as to be receptive to, electroless deposition of conductive material; and a non-receptive covering (2, 6) of insulating material overlying the receptive body; ii) removing material by stepwise machining through the depth of the non-receptive covering by ultra-violet induced ablation so as to expose the receptive body in the form of a desired conductor pattern; and iii) electrolessly depositing conductive material (11) on the exposed receptive body to form the conductor pattern. Further layers of receptive material (14, 15) and non-receptive material (16, 17) may be applied to allow further circuit layers to be made. An excimer laser is a suitable source of ultraviolet radiation.