Thin film coil and electronic device having the same

• US 9,165,708 B2
• Filed: 06/26/2012
• Issued: 10/20/2015
• Est. Priority Date: 03/29/2012
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Lim, Dae Ki, An, Chan Gwang, Chang, Ki Won, Bae, Sang Woo, Cho, Sung Eun, Sung, Jae Suk, Kim, Tae Sung, Nam, Hyeon Gil, Lee, Hyun Seok, Han, Chang Mok
• Primary Examiner(s): Whitmore, Stacy
• Application Number:
  US13/533,560
• Publication Number:
  US 20130257362A1
• Time in Patent Office: 1,211 Days
• Field of Search: 320107-108, 336/200, 336/90, 336/186, 336/232
• US Class Current: 1/1
• CPC Class Codes: H01F 17/00 Fixed inductances of the signal type coils in general H01F5/00; inductors without a potential-jump or surface barrier specially adapted for integrated circuits, details thereof and multistep manufacturing processes therefor H01L28/10
• CPC Class Codes: H01F 17/0006 Printed inductances printed coils for dynamo-electric machines H02K3/26; printed circuits H05K
• CPC Class Codes: H01F 2017/004 with the coil helically wound around an axis without a core
• CPC Class Codes: H01F 2017/0053 with means to reduce eddy currents
• CPC Class Codes: H01F 2017/0073 with a special conductive pattern, e.g. flat spiral
• CPC Class Codes: H01F 2017/0086 on semiconductor substrate inductors for integrated circuits H01L28/10
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01F 5/00 Coils superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

A thin film coil and an electronic device having the same. The thin film coil includes a substrate; and a coil pattern including a first coil strand and a second coil strand formed respectively on opposite surfaces of the substrate, wherein the first coil strand formed on one surface of the substrate includes at least one path that passes through the other surface of the substrate.

Claims

1. A thin film coil comprising:

a substrate; and

a coil pattern including a first coil strand and a second coil strand formed respectively on opposite surfaces of the substrate and electrically connected in parallel with each other, and

the first coil strand formed on one surface of the substrate including a plurality of paths, each of the plurality of paths passing through the other surface of the substrate and electrically connecting between two sections of the first coil strand located on the one surface.

2. The thin film coil of claim 1, wherein at least one of the plurality of paths comprises a portion of the second coil strand formed on the other surface of the substrate.

3. The thin film coil of claim 2, wherein at least one of the plurality of paths is formed as the first coil strand is connected to the second coil strand through a via.

4. The thin film coil of claim 2, wherein at least one of the plurality of paths comprises:

two vias electrically connecting the first coil strand and the second coil strand; and

a conductive section of the second coil strand disposed between the two vias, the conductive section being an electrical path shared between the first coil strand and the second coil strand.

5. The thin film coil of claim 1, further comprising two contact pads disposed outwardly of the coil pattern and electrically connected to both ends of the coil pattern.

6. The thin film coil of claim 5, wherein one end of the first coil strand is electrically connected to the contact pad through a lead out pattern that passes over each of the plurality of paths.

7. The thin film coil of claim 1, wherein the second coil strand includes a conductive connection via formed to be disposed at each of both ends thereof and is electrically connected to the first coil strand by the conductive connection via.

8. The thin film coil of claim 1, wherein the first coil strand and the second coil strand are disposed on portions of both surfaces of the substrate to which they correspond in a vertical direction.

9. The thin film coil of claim 1, wherein the first coil strand comprises:

a spiral pattern; and

a lead out pattern formed on the one surface of the substrate and passing from an inner position of the spiral pattern to an outer side of the spiral pattern, the lead out pattern traversing over each of the plurality of paths at portions of the paths passing through the other surface of the substrate, the lead out pattern being substantially coplanar with portions of the first coil strand located on the one surface of the substrate.

10. A case for a portable electronic device, the case adapted to cover a battery of the portable electronic device and comprising:

a contactless power reception apparatus having the thin film coil of claim 1 and attached to an inner surface of the case.

11. A case for a portable electronic device, the case adapted to cover a battery of the portable electronic device, and the case comprising:

a contactless power reception apparatus having the thin film coil of claim 1 and attached to an inner surface of the case, the first coil strand of the thin film coil further comprising

a spiral pattern,

a plurality of paths, each of the plurality of paths passing through the other surface of the substrate and electrically connecting between two sections of the spiral pattern of the first coil strand located on the one surface, each of the plurality of paths comprising

two vias electrically connecting the first coil strand and the second coil strand, and

a conductive section of the second coil strand disposed between the two vias, the conductive section being an electrical path shared between the first coil strand and the second coil strand, and

a lead out pattern formed on the one surface of the substrate and passing from an inner position of the spiral pattern to an outer side of the spiral pattern, the lead out pattern traversing over each of the plurality of paths at portions of the paths passing through the other surface of the substrate, the lead out pattern being substantially coplanar with portions of the first coil strand located on the one surface of the substrate.

12. A portable electronic device comprising:

a contactless power reception apparatus having the thin film coil of claim 1;

a battery configured to receive and store power transmitted to the power reception apparatus, and

a case to contain the power reception apparatus and the battery.

13. A thin film coil comprising:

a substrate;

a coil pattern including a first coil strand and a second coil strand formed respectively on opposite surfaces of the substrate; and

two contact pads disposed outwardly of the coil pattern and electrically connected to both ends thereof,

the first coil strand formed on one surface of the substrate including;

a spiral pattern electrically connected in parallel with the second coil strand,

a lead out pattern disposed to traverse the spiral pattern from one end disposed at an inner side of the spiral pattern so as to be electrically connected to the contact pad, the lead out pattern being substantially coplanar with the spiral pattern, and

a plurality of paths, each of the plurality of paths passing through the other surface of the substrate and electrically connecting between two sections of the first coil strand located on the one surface.

14. The thin film coil of claim 13, wherein a portion of the spiral pattern of the first coil strand in which the lead out pattern is disposed passes through the other surface of the substrate.

15. The thin film coil of claim 14, wherein at least one of the plurality of paths of the first coil shares a portion of the second coil strand formed on the other surface of the substrate.

16. An electronic device comprising:

a contactless power transmission apparatus having a thin film coil including a first coil strand and a second coil strand formed respectively on opposite surfaces of a substrate and electrically connected in parallel with each other,

the first coil strand formed on one surface of the substrate including a plurality of paths, each of the plurality of paths passing through the other surface of the substrate and electrically connecting between two sections of the first coil strand located on the one surface; and

a case to accommodate the contactless power transmission apparatus therein.

17. The electronic device of claim 16, wherein the contactless power transmission apparatus is directly attached to an inner surface of the case or disposed to be closer to the inner surface of the case.

18. The electronic device of claim 16, further comprising:

a battery to store power generated from the contactless power transmission apparatus.

19. The electronic device of claim 16, further comprising

a voltage conversion unit configured to convert alternating current (AC) power supplied from outside the electronic device into an AC voltage having a particular frequency and to provide the converted AC voltage to the contactless power transmission apparatus.

20. A contactless power charging system comprising:

a portable electronic device comprising

a contactless power reception apparatus having a thin film coil, the thin film coil comprising

a substrate; and

a coil pattern including a first coil strand and a second coil strand formed respectively on opposite surfaces of the substrate and electrically connected in parallel with each other, and

the first coil strand formed on one surface of the substrate including at least one path passing through the other surface of the substrate and electrically connecting between two sections of the first coil strand located on the one surface,

a battery configured to receive and store power transmitted to the contactless power reception apparatus, and

a case to contain the contactless power reception apparatus and the battery; and

a charging device comprising a coil, the charging device configured to generate a magnetic field to transmit power to the thin film coil of the contactless power reception apparatus, to thereby charge the battery of the portable electronic device,

the first coil strand comprising

a plurality of paths, each of the plurality of paths passing through the other surface of the substrate and electrically connecting between two sections of the first coil strand located on the one surface,

a spiral pattern, and

a lead out pattern formed on the one surface of the substrate and passing from an inner position of the spiral pattern to an outer side of the spiral pattern, the lead out pattern traversing over each of the plurality of paths at portions of the paths passing through the other surface of the substrate, the lead out pattern being substantially coplanar with portions of the first coil strand located on the one surface of the substrate.