초록 ▼

Inductive electrical components fabricated by PWB techniques of ferromagnetic core or cores are embedded in an insulating board provided with conductive layers. Conductive through-holes are provided in the board on opposite sides of a core. The conductive layers are patterned to form with the conduc

Inductive electrical components fabricated by PWB techniques of ferromagnetic core or cores are embedded in an insulating board provided with conductive layers. Conductive through-holes are provided in the board on opposite sides of a core. The conductive layers are patterned to form with the conductive through-holes one or more sets of conductive turns forming a winding or windings encircling the core. The conductive layers can also be patterned to form contact pads on the board and conductive traces connecting the pads to the windings.

대표청구항 ▼

[ What is claimed is:] [1.] A method of fabricating a ferromagnetic device, comprising the steps:(a) providing a ferromagnetic core comprising an annular body having an outer periphery and an inner periphery surrounding a hole and embedding the core in a carrier having a non-magnetic insulating laye

[ What is claimed is:] [1.] A method of fabricating a ferromagnetic device, comprising the steps:(a) providing a ferromagnetic core comprising an annular body having an outer periphery and an inner periphery surrounding a hole and embedding the core in a carrier having a non-magnetic insulating layer and providing inside the core hole a non-magnetic insulating material,(b) providing on opposite surfaces of the insulating layer first and second conductive layers, respectively,(c) forming conductive through-holes extending through said carrier outside of the annular body and through the insulating material inside the hole of the annular body and connected to the first and second conductive layers,(d) patterning the first and second conductive layers to form, together with some of the conductive through-holes, at least one set of interconnected conductive turns encircling the ferromagnetic core body to form at least a first coil of said ferromagnetic device.