Patent ID: 7604835

Claim:
A method for manufacturing a wiring substrate without using a mask, the method consisting of: (a) providing a cationic surface-active agent in first and second areas of a substrate; (b) providing an anionic surface-active agent in the first areas of the substrate and on the cationic surface-active agent to form a two-layer structure of the cationic surface-active agent and the anionic surface-active agent in the first areas, the anionic surface-active agent being provided in the first areas and on the cationic surface-active agent without using the mask by an ink jet method that disposes droplets consisting of an adhesive material that coats a core of the anionic surface-active agent; (c) providing a catalyst on either the two-layer structure of the cationic surface-active agent and the anionic surface-active agent in the first areas or on the cationic surface-active agent in the second areas, the catalyst provided on the two-layer structure being a positively charged catalyst and the catalyst provided on the cationic surface-active agent being a negatively charged catalyst; and (d) depositing a metal layer on the catalyst to thereby form a wiring composed of the metal layer along the first area.