Apparatus and methods for increasing magnetic field in an audio device

• US 7,418,106 B2
• Filed: 06/21/2004
• Issued: 08/26/2008
• Est. Priority Date: 06/21/2004
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Sobczak, Peter, Shen, Haoye, Khatam, Bahman, Greuet, Jean-Baptiste
• Primary Examiner(s): Tran; Sinh
• Assistant Examiner(s): Briney, III; Walter F
• Application Number:
  US10/873,061
• Publication Number:
  US 20050281425A1
• Time in Patent Office: 1,527 Days
• Field of Search: 381/79, 381/312, 381/315, 381/322, 381/326, 379/443, 379/444
• US Class Current: 381/331
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04R 25/554 using a wireless connection, e.g. between microphone and amplifier or using Tcoils

Abstract

An audio device is provided that is in electrical communication with a magnetic coil for the purpose of increasing magnetic field emissions generated by the device. The magnetic coil may be disposed on a flexible substrate in multi-turn and multi-layer format or disposed on a foldable flexible substrate in multi-turn and multi-layer format. Additionally, the magnetic coil may be disposed on the device'"'"'s printed circuit board or the coil may be a freestanding, substrate-free coil assembly. The magnetic coil may be placed and secured in various locations within the device to maximize magnetic field emissions and minimize problems related to space limitations. The increased magnetic field results in a device that is hearing-aid compatible as defined by the Federal Communications Commission.

Claims

1. An audio device, the device comprising:

one or more driver circuits;

a transducer in electrical communication with one of the one or more driver circuits;

a magnetic coil in electrical communication with one of the one or more driver circuits that provide for a magnetic field emission that combines with any other audio device magnetic fields to result in an overall increased magnetic field;

a substrate upon which the magnetic coil is disposed on the substrate; and

a printed circuit board to which the substrate is attached, wherein the printed circuit board includes the one or more driver circuits.

2. The audio device of claim 1, wherein the magnetic coil is provided for Hearing Aid Compatibility (HAC).

3. The audio device of claim 1, wherein the transducer provides for a transducer magnetic field, such that the coil magnetic field emission combines the transducer magnetic field emission to result in an overall increased magnetic field.

4. The audio device of claim 1, wherein the magnetic coil is formed in a single-turn arrangement.

5. The audio device of claim 1, wherein the magnetic coil is formed in a multi-turn arrangement.

6. The audio device of claim 1, wherein the magnetic coil is formed in a single-layer arrangement.

7. The audio device of claim 1, wherein the magnetic coil is formed in a multi-layer arrangement.

8. The audio device of claim 1, wherein the substrate is flexible.

9. The audio device of claim 8, wherein the magnetic coil is disposed on both planar sides of the flexible substrate.

10. The audio device of claim 8, wherein the magnetic coil is disposed on a flexible substrate that is capable of being folded within a mobile telephone apparatus.

11. The audio device of claim 8, wherein the magnetic coil is arranged in multiple layers on a planar side of the flexible substrate.

12. The audio device of claim 11, wherein the magnetic coil comprises a dielectric adhesive layer separating each of the multiple layers.

13. The audio device of claim 8, wherein the magnetic coil is arranged in multiple layers on both planar sides of the flexible substrate.

14. The audio device of claim 13, wherein the multiple layers are each separated by a dielectric adhesive layer.

15. The audio device of claim 1, wherein the magnetic coil comprises a dielectric adhesive layer separating each of a plurality of coil layers.

16. The audio device of claim 1, wherein the transducer and the magnetic coil are in electrical communication with the same driver circuit.

17. The audio device of claim 16, wherein the driver, the transducer and the magnetic coil are electrically connected in series.

18. The audio device of claim 16, wherein the driver, the transducer and the magnetic coil are electrically connected in parallel.

19. The audio device of claim 1, wherein the transducer is in electrical communication with a first driver circuit and the magnetic coil is in electrical communication with a second driver circuit.

20. The audio device of claim 1, further comprising a first device cover that encloses the printed circuit board, a second device cover adjacent to the first device cover that encloses a transducer gasket that supports the transducer, and a third device cover adjacent to the second device cover that includes a sound port.

21. The audio device of claim 20, wherein the magnetic coil generally surrounds the transducer gasket.

22. The audio device of claim 20, wherein the magnetic coil generally surrounds the transducer.

23. The audio device of claim 1, wherein the magnetic coil is located proximate the transducer within an audio device housing.

24. A hearing-aid compatible audio device, the device comprising:

a driver circuit;

a transducer in electrical communication with the driver circuit;

a magnetic coil in electrical communication with the driver circuit that provides for a magnetic field emission that combines with other audio device magnetic fields to result in an overall increased magnetic field;

a substrate upon which the magnetic coil is disposed; and

a printed circuit board to which the substrate is attached, wherein the printed circuit board includes the one or more driver circuits.

25. The hearing-aid compatible audio device of claim 24, wherein the magnetic coil is formed in a single-turn arrangement.

26. The hearing-aid compatible audio device of claim 24, wherein the magnetic coil is formed in a multi-turn arrangement.

27. The hearing-aid compatible audio device of claim 24, wherein the magnetic coil is formed in a single-layer arrangement.

28. The hearing-aid compatible audio device of claim 24, wherein the magnetic coil is formed in a multi-layer arrangement.

29. The hearing-aid compatible audio device of claim 24, wherein the substrate is flexible.

30. The hearing-aid compatible audio device of claim 29, wherein the magnetic coil is disposed on a flexible substrate that is capable of being folded within a mobile telephone apparatus.

31. The hearing-aid compatible audio device of claim 24, wherein the printed circuit board includes one or more driver circuits.

32. A method comprising:

providing for a transducer associated with an audio device that is in electrical communication with an audio driver circuit,

providing for a magnetic coil associated with the audio device that is in electrical communication with the audio device driver circuit,

providing for a substrate upon which the magnetic coil is disposed,

providing for a printed circuit board to which the substrate is attached, the printed circuit board including the audio device driver circuit, and

driving the magnetic coil with the driver circuit during device operation to provide a magnetic field emission that combines with any other audio device magnetic field to result in an increased magnetic field.

33. The method of claim 32, wherein the step of driving the magnetic coil with the driver circuit during device operation to provide a magnetic field emission that combines with any other audio device magnetic field to result in an increased magnetic field is further defined as being performed for the purpose of Hearing Aid Compatibility (HAC).

34. The method of claim 32, wherein the step of providing for a substrate further comprises providing for a flexible substrate.

35. The method of claim 32, wherein the step of providing for a substrate further comprises providing for a flexible substrate that is foldable so as to result in a stacked coil arrangement.

36. The method of claim 32, wherein the step of providing a magnetic coil further comprises providing a magnetic coil that is unsupported by a substrate and is proximate to the transducer of the device.