Thin film coil and electronic device having the same
There are provided a thin film coil and an electronic device having the same, the thin film coil including a substrate; and a coil pattern including a first coil strand and a second coil strand formed on both surfaces of the substrate, respectively, wherein the first coil strand formed on one surface of the substrate includes at least one gyration path that passes through the other surface of the substrate and gyrates.
1. A thin film coil, comprising:
a substrate comprising a first surface and a second surface, and formed of an insulating layer;
a first coil strand disposed on the first surface of the substrate, and including a spiral pattern and a lead-out pattern, the lead-out pattern having an end disposed inside the spiral pattern to be led out from the end, outwardly of the spiral pattern;
a second coil strand disposed on the second surface of the substrate, wherein the second coil strand overlaps and is insulated from the spiral pattern in a portion away from the lead-out pattern; and
a plurality of detour vias electrically connecting the first coil strand and the second coil strand to each other, while penetrating through the substrate in a position adjacent to the lead out pattern,
wherein windings of the spiral pattern are spaced apart from each other on the first surface and electrically maintained across the lead-out pattern by the second coil strand through at least one of the plurality of detour vias.
2. The thin film coil of claim 1 , further comprising two contact pads disposed outwardly of the spiral pattern, and electrically connected to both ends of at least one of the first coil strand or the second coil strand.
3. The thin film coil of claim 1 , wherein the first coil strand and the second coil strand are connected in parallel.
4. The thin film coil of claim 1 , wherein the second coil strand is provided with a conductive connection via disposed at each of both ends of the second coil strand, and is electrically connected to the first coil strand by the conductive connection via.
5. The thin film coil of claim 1 , wherein the first coil strand and the second coil strand are disposed in positions on two surfaces of the substrate, respectively, the positions corresponding to each other in a vertical direction.
6. The thin film coil of claim 1 , wherein the substrate comprises a circuit board.
7. The thin film coil of claim 1 , wherein the plurality of detour vias comprises two detour vias for a winding of the spiral pattern.