Patent ID: 6876285

Claim:
A high density multi-layer microcoil, comprising: a substrate; a multi-layer coil winding, comprised of conductive lead and tin alloys having a low melting point, and being formed on said substrate, and being composed of a plurality of coil element layers linking one another; each coil element layer being comprised of at least a first winding, and a second winding formed within the first winding, with the first and second windings of each coil element layer being disposed in a common plane, the second winding of at least one of the coil element layers being connected with the first winding of an adjacent coil element layer, so that all of the coil element layers are similarly wound, two ends of said coil element layers being contact points for outer circuits; and a dry film photoresist structure comprised of high strength materials, and being formed on said substrate and enclosing said multi-layer coil winding for supporting said coil winding.