EP 0716432 B1 2000-02-23 - Planar inductor
DE 4442994 A
[origin: EP0716432A1] The inductance has at least one essentially spiral shaped coil (2, 3) formed on a flat substrate (1). A layer of ferromagnetic material (13) is arranged on the substrate (1). The ferromagnetic material (13) is applied to the substrate (1) in a coating process, within an insulation window (12) fastened to the substrate (1). The window (12) is preferably fastened to the substrate (1) by adhesive. The ferromagnetic material may be a coating material mixed with a ferromagnetic admixture, eg. ferrite powder. The value of the induction of the coil(s) (2,3) and/or the coupling between the coils (2, 3) may be determined by the alignment and/or the contour of the insulation window (12) and/or by the layer depth and/or combination of the ferromagnetic material (13).
IPC 1-7 (main, further and additional classification)
IPC 8 full level (invention and additional information)
CPC (invention and additional information)
Designated contracting state (EPC)
DE FR GB