Audio transducer with electrostatic discharge protection

• US 10,448,165 B2
• Filed: 04/17/2014
• Issued: 10/15/2019
• Est. Priority Date: 04/17/2014
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Technologies Oy (Nokia Corporation)
• Inventors: Backman, Juha Reinhold, Ozcan, Koray
• Primary Examiner(s): Le, Huyen D
• Application Number:
  US14/254,940
• Publication Number:
  US 20150304776A1
• Time in Patent Office: 2,007 Days
• Field of Search: 381 96, 381370, 381380, 381384, 381386, 381189, 381396, 381398, 381409, 381410, 181171, 181172, 181167, 181168
• CPC Class Codes: H04R 1/00 Details of transducers, loudspeakers or microphones
• CPC Class Codes: H04R 2207/00 Details of diaphragms or cones for electromechanical transducers or their suspension covered by H04R7/00 but not provided for in H04R7/00 or in H04R2307/00
• CPC Class Codes: H04R 2225/49 Reducing the effects of electromagnetic noise on the functioning of hearing aids, by, e.g. shielding, signal processing adaptation, selective (de)activation of electronic parts in hearing aid
• CPC Class Codes: H04R 2307/027 Diaphragms comprising metallic materials
• CPC Class Codes: H04R 2307/204 Material aspects of the outer suspension of loudspeaker diaphragms
• CPC Class Codes: H04R 2400/11 Aspects regarding the frame of loudspeaker transducers
• CPC Class Codes: H04R 31/003 for diaphragms or their outer suspension
• CPC Class Codes: H04R 7/00 Diaphragms for electromechanical transducers in general F16J3/00; Cones for musical instruments G10 cones, diaphragms or the like, for emitting or receiving sound in general G10K13/00; Mounting thereof
• CPC Class Codes: H04R 7/20 Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
• CPC Class Codes: H04R 9/02 Details
• CPC Class Codes: H04R 9/06 Loudspeakers

Abstract

An apparatus including a transducer configured to generate sound, where the transducer comprises a diaphragm. At least one portion of the transducer is electrically conductive and is configured to provide an electrical connectivity to a ground. The at least one portion, at least in part, circumferences the diaphragm.

Claims

1. An apparatus comprising a transducer configured to generate sound, wherein the transducer comprises at least one frame member, a diaphragm, and a surround connecting the diaphragm to the at least one frame member, where the surround circumferences the diaphragm to provide spring functionality for the diaphragm and is configured to allow the diaphragm to move relative to the at least one frame member with a substantially pistonic motion, wherein at least one of the at least one frame member or a magnet assembly of the apparatus is at least partially electrically conductive and where the surround is at least partially electrically conductive to at least partially provide a conductive path to a ground of the apparatus for electrostatic discharge protection, wherein the conductive path is provided at least from the at least partially electrically conductive surround towards the ground of the apparatus, wherein the at least partially electrically conductive surround is connected to the ground of the apparatus using the conductive path, where the conductive path is different from electrical terminals of the transducer, where the conductive path is provided at a pre-determined location different from a location of the electrical terminals, and wherein the apparatus is an electronic device.

2. An apparatus as in claim 1 where the diaphragm comprises electrically conductive material which is electrically connected to the conductive path.

3. An apparatus as in claim 1 where the conductive path comprises at least one of:

the sound transducer diaphragm,

a gasket,

the at least one frame member or chassis of the sound transducer,

a cover of the transducer, or

an electrically conductive coating on at least one of the diaphragm, the surround, the gasket, the at least one frame member or chassis, an electrically conductive clamp or the cover.

4. An apparatus as in claim 1 where the diaphragm and/or the surround comprises a coating consisting at least one of metal, graphite, or graphene.

5. An apparatus as in claim 1 where the surround comprises a resilient section, where the conductive path comprises an electrically conductive coating on the resilient section and/or one or more conductive elements embedded with the resilient section.

6. An apparatus as in claim 1 where the conductive path is at least partially on or in the surround, connected to the diaphragm, and comprises at least one of a metallic coating, embedded conductive fibers, or conductive strips.

7. An apparatus as in claim 1 where the diaphragm and the surround comprise a common one-piece member.

8. A device comprising:

the apparatus as in claim 1; and

at least one other member electrically connected to the conductive path, where the at least one other member connects the conductive path to the ground.

9. A device as in claim 8 where the at least one other member comprises at least one of:

an electrically conductive member of a sound transducer frame, an electrically conductive member of a sound transducer magnet assembly, an electrically conductive gasket, an electrically conductive clamp, or an electrically conductive printed wiring board connector.

10. A device as in claim 8 where the conductive path comprises an electrical connection area, and where the at least one other member is connected to the electrical connection area.

11. A device as in claim 8 further comprising:

at least one printed wiring board having the ground;

an electrical display connected to the at least one printed wiring board;

a receiver connected to the at least one printed wiring board;

a transmitter connected to the at least one printed wiring board;

a processor connected to the at least one printed wiring board;

a memory connected to the at least one printed wiring board; and

a battery connected to the at least one printed wiring board.

12. An apparatus as in claim 1 wherein a first section of the surround is attached to the at least one frame member and an opposite second section of the surround is attached to the diaphragm.

13. An apparatus as in claim 12 wherein the first section of the surround is attached to the at least one frame member.

14. An apparatus as in claim 1 wherein the surround comprises at least one of:

a resin treated cloth, resin treated non-wovens, polymeric foams, or thermoplastic elastomers over-molded onto the diaphragm.

15. An apparatus as in claim 1 wherein the diaphragm comprises a first material, wherein the surround comprises a second different material.

21. A method as in claim 12 where the conductive path comprises at least one of:

an electrically conductive member of a sound transducer frame, an electrically conductive member of a sound transducer magnet assembly, an electrically conductive gasket, or an electrically conductive clamp, or an electrically conductive printed wiring board connector.

22. A method as in claim 12 further comprising electrically connecting the conductive path to a printed wiring board.

16. A method comprising:

providing a transducer configured to generate sound, wherein the transducer comprises at least one frame member, a diaphragm, and a surround connecting the diaphragm to the at least one frame member, where the surround circumferences the diaphragm to provide spring functionality for the diaphragm and is configured to allow the diaphragm to move relative to the at least one frame member with a substantially pistonic motion; and

positioning at least one portion of the surround at close proximity to the diaphragm,

wherein at least one of the at least one frame member or a magnet assembly of the transducer is at least partially electrically conductive and where the surround is at least partially electrically conductive to at least partially provide a conductive path to a ground of an apparatus for electrostatic discharge protection, wherein the conductive path is provided at least from the at least partially electrically conductive surround towards the ground of the apparatus, wherein the at least partially electrically conductive surround is connected to the ground of the apparatus using the conductive path, and where the conductive path is different from electrical terminals of the transducer, where the conductive path is provided at a pre-determined location different from a location of the electrical terminals, and wherein the apparatus is an electronic device.

17. A method as in claim 16 further comprising connecting the surround to the diaphragm comprising electrically connecting an electrically conductive section of the diaphragm to the at least one portion using the surround.

18. A method as in claim 16 where the diaphragm and/or the surround is provided with a coating including at least one of:

metal, graphite, or graphene.

19. A method as in claim 16 where the surround comprises a resilient section having the at least one portion thereon, where the at least one portion comprises an electrically conductive coating on the resilient section and/or one or more conductive elements embedded with the resilient section.

20. A method as in claim 16 where the surround comprises at least one of a metallic coating, embedded conductive fibers, or conductive strips.

23. An apparatus comprising:

a sound transducer diaphragm;

a magnet;

a coil; and

a surround connected to the sound transducer diaphragm, wherein the surround circumferences the sound transducer diaphragm to provide spring functionality for the sound transducer diaphragm, wherein at least one of at least one frame member of the apparatus or a magnet assembly is at least partially electrically conductive and where the surround is at least partially electrically conductive to provide a conductive path to be connected to a ground of an electronic device for electrostatic discharge protection, where the surround is configured to allow the diaphragm to move relative to the at least one frame member of the apparatus with a substantially pistonic motion, wherein the conductive path is provided at least from the at least partially electrically conductive surround towards the ground of the electronic devide, wherein the at least partially electrically conductive surround is configured to be connected to the ground of the electronic device using the conductive path, where the conductive path is different from electrical terminals of the apparatus, where the conductive path is provided at a pre-determined location different from a location of the electrical terminals, and wherein the apparatus is a sound transducer configured to be located inside the electronic device.