Patent ID: 6710694
Filing Date: 2004-03-23
Classification: H01F

Abstract:
A coil device comprising:a first magnetic substrate; a laminated body disposed on the first magnetic substrate and having insulating layers, coil patterns, and at least one through-hole; a magnetic layer covering the upper surface of the laminated body; an adhesive layer disposed on the magnetic layer; and a second magnetic substrate disposed on the adhesive layer and bonded to the magnetic layer with the adhesive layer; wherein the insulating layers define an insulator and the coil patterns for defining coils are stacked so that the coils are disposed in the insulator, the at least one through-hole is located at an area where the coils are not situated and extends from the upper surface of the laminated body to the first magnetic substrate, the magnetic layer has at least one portion extending through the at least one through-hole to contact the first magnetic substrate, the adhesive layer is nonmagnetic, and the laminated body is sandwiched between the first and second substrates.