Shield for use with a computing device that receives an inductive signal transmission

• US 8,401,469 B2
• Filed: 06/04/2009
• Issued: 03/19/2013
• Est. Priority Date: 09/26/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Chatterjee, Manjirnath, Lehr, Michael, Crooijmans, Wim, Corbridge, Mark
• Primary Examiner(s): Yun, Eugene
• Application Number:
  US12/455,802
• Publication Number:
  US 20100081483A1
• Time in Patent Office: 1,384 Days
• Field of Search: 455/575.5, 455/106, 455/300, 455/301, 455/573, 455/41.1, 455/41.2, 455/292, 455/90.3
• US Class Current: 455/41.1
• CPC Class Codes: H01F 1/15333 containing nanocrystallites, e.g. obtained by annealing
• CPC Class Codes: H01F 2027/348 Preventing eddy currents
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/361 made of combinations of electrically conductive material and ferromagnetic material
• 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 7/0242 Magnetic drives, magnetic coupling devices
• CPC Class Codes: H05K 9/0075 Magnetic shielding materials

Abstract

Embodiments described herein include a computing device that is capable of inductive signal transfer with other computing devices. Such computing devices are provided a shield that protects the device and other components from electromagnetic interference and unwanted electrical affects resulting from the inductive signal transfer.

Claims

1. A computing device comprising:

a housing;

a set of components for enabling receipt of an inductive signal transmitted from another device, the set of components being at least partially contained within the housing; and

an inductive shield positioned near or adjacent to an exterior surface of the housing to shield one or more electrical elements within the housing from a magnetic flux that is provided in connection with the signal transmitted from the other device, wherein the inductive shield is formed to have low magnetic reluctance.

2. The computing device of claim 1, wherein the inductive shield comprises a material with high magnetic permeability.

3. The computing device of claim 1, wherein the inductive shield is also formed to have high electrical resistance.

4. The computing device of claim 1, wherein the inductive shield includes Finemet.

5. The computing device of claim 4, wherein the Finemet has a holed center region.

6. The computing device of claim 4, wherein the Finemet has a magnet in its center region.

7. The computing device of claim 4, wherein the Finemet is shaped to include four leaves about a center region.

8. The computing device of claim 4, wherein the Finemet is shaped to have three leaves and a center region.

9. The computing device of claim 1, wherein the inductive shield comprises a plurality of layers.

10. The computing device of claim 1, wherein the inductive shield comprises material of high magnetic permeability and a center core element.

11. The computing device of claim 10, wherein the inductive shield comprises the material of high magnetic permeability, the center core element, and one or more perimeter core elements.

12. The computing device of claim 10, wherein the material is disk shaped.

13. The computing device of claim 12, wherein the material includes a plurality of radial slits.

14. The computing device of claim 1, wherein the set of components include one or more coils, and wherein the computing device includes a back faç

ade on its housing, to which the inductive shield is positioned adjacent to.

15. The computing device of claim 1, wherein the computing device corresponds to a docking station, and wherein the set of components include one or more coils positioned on a receiving surface of the docking station.

16. The computing device of claim 15, wherein the computing device includes one or more core elements that retain the one or more coils.

17. The computing device of claim 16, wherein the one or more coil elements correspond to a ferrite structure.

18. The computing device of claim 15, wherein the inductive shield includes a vertical section that extends to another device that is to be received and inductively mated on the docking station.

19. The computing device of claim 1, further comprising one or more layers that provide an electric field shield, positioned between the one or more electrical elements that are shielded from the magnetic flux and the inductive shield.

20. The computing device of claim 1, wherein the inductive shield comprises material of high magnetic permeability and a center opening.

21. A computer system comprising:

a pair of computing devices, each device in the pair including one or more magnetic coils to enable that computing device to transmit or receive an inductive signal from another device in the pair;

wherein at least one of the computing devices in the pair includes an inductive shield to protect one or more electrical elements of that device from a magnetic flux, the magnetic flux being provided with transmission of an inductive signal from that device, or reception of the inductive signal on that device; and

wherein the inductive shield is formed to have low magnetic reluctance.

22. The computer system of claim 21, wherein the inductive shield also has high electrical resistance.

23. The computer system of claim 21, wherein the inductive shield is formed from Finemet.

24. The computer system of claim 21, wherein the inductive shield is shaped to have one or more leaves.