Patent ID: 7479297

Claim:
A method of manufacturing a multi-layered wiring board having at least two conductor layers, an interlayer insulation layer provided between the conductor layers, and a conductor post that electrically connects the conductor layers, on a substrate, the method comprising: discharging a first droplet containing a conductive material from a discharge head; piling successive droplets on the first droplet to form the conductor post; and applying light energy from a laser light source to the piled droplets between successive droplets as the droplets are piled on the conductor post and during discharge of subsequent droplets from the discharge head; moving an optical element of the laser light source based on a position of a top droplet disposed on the conductor post; and changing a focal position of the laser light source to a crown of the top droplet; wherein less light energy is applied to droplets piled on the conductor post than is applied to the first droplet disposed on the substrate; and wherein the light energy is applied to the discharged droplet before the droplet spreads by wetting at a landing portion of the substrate.