Mobile wireless communications device having improved RF immunity of audio transducers to electromagnetic interference (EMI)

• US 8,565,842 B2
• Filed: 01/16/2013
• Issued: 10/22/2013
• Est. Priority Date: 04/04/2005
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Zhu, Lizhong, Mankaruse, George Soliman, Corrigan, Michael Stephen
• Primary Examiner(s): Mehrpour, Melody
• Application Number:
  US13/742,548
• Publication Number:
  US 20130130755A1
• Time in Patent Office: 279 Days
• Field of Search: 455/450.1, 455/73, 455/88, 455/85, 455/310, 455/303, 455/298, 455/309, 455/312, 455/558, 455/557, 455/90.1, 455/234.1, 455/234.2, 455/245.1, 455/246.1, 455/250.1, 455/418, 455/417, 455/67.13
• US Class Current: 455/575.1
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04B 1/3833 Hand-held transceivers
• CPC Class Codes: H04M 1/026 Details of the structure or mounting of specific components
• CPC Class Codes: H04M 1/6016 in the receiver circuit
• CPC Class Codes: H04M 1/724 User interfaces specially adapted for cordless or mobile telephones
• CPC Class Codes: Y10T 29/49002 Electrical device making
• CPC Class Codes: Y10T 29/49005 Acoustic transducer
• CPC Class Codes: Y10T 29/49018 with other electrical component

Abstract

A mobile wireless communications device includes a housing and circuit board carried by the housing and having radio frequency (RF) circuitry and a processor operative with each other. Audio circuitry is carried by the circuit board and an audio transducer assembly, such as a speaker, has electrical contacts that electrically engage the audio circuitry for carrying audio signals between the audio circuitry and audio transducer assembly. A filter is mounted at the audio transducer assembly and reduces radio frequency (RF) electromagnetic interference to the audio transducer assembly during device operation.

Claims

1. An electronic device comprising:

a circuit board including radio frequency (RF) circuitry and audio circuitry carried by the circuit board;

an audio transducer carried by the circuit board, a transducer housing for said audio transducer and carried by said circuit board, and at least one resilient electrical contact pad on said transducer housing and coupling said audio transducer to said audio circuitry; and

at least one filter mounted at said at least one resilient electrical contact pad member.

2. The electronic device according to claim 1, wherein said at least one resilient electrical contact pad comprises a plurality thereof.

3. The electronic device according to claim 2, wherein said at least one filter comprises a plurality thereof mounted adjacent respective resilient electrical contact pads.

4. The electronic device according to claim 1, wherein said at least one filter comprises at least one ferrite bead.

5. The electronic device according to claim 1, wherein said at least one filter comprises at least one surface mount filter.

6. The electronic device according to claim 1, wherein said audio transducer comprises a speaker.

7. The electronic device according to claim 1, further comprising an antenna circuit board coupled to said circuit board.

8. An electronic device comprising:

a circuit board including radio frequency (RF) circuitry and audio circuitry carried by the circuit board;

an audio transducer carried by the circuit board, a transducer housing carried by the circuit board for said audio transducer, and at least one resilient electrical contact pad member on said transducer housing and coupling said audio transducer to said audio circuitry; and

at least one filter mounted within said transducer housing.

9. The electronic device according to claim 8, wherein said at least one resilient electrical contact pad comprises a plurality thereof.

10. The electronic device according to claim 8, wherein said at least one filter comprises at least one ferrite bead.

11. The electronic device according to claim 8, wherein said at least one filter comprises at least one surface mount filter.

12. The electronic device according to claim 8, wherein said audio transducer comprises a speaker.

13. The electronic device according to claim 8, further comprising an antenna circuit board coupled to said circuit board.

14. A method for making an electronic device comprising:

providing a circuit board including radio frequency (RF) circuitry and audio circuitry carried by the circuit board;

mounting a transducer housing and associated audio transducer on the circuit board so that at least one resilient electrical contact pad on the transducer housing couples the audio transducer to the audio circuitry; and

mounting at least one filter at the at least one resilient electrical contact pad.

15. The method according to claim 14, wherein the at least one resilient electrical contact pad comprises a plurality thereof.

16. The method according to claim 15, wherein the at least one filter comprises a plurality thereof connected adjacent respective resilient electrical contact pads.

17. The method according to claim 14, wherein the at least one filter comprises at least one ferrite bead.

18. The method according to claim 14, wherein the at least one filter comprises at least one surface mount filter.

19. A method for making an electronic device comprising:

providing a circuit board including radio frequency (RF) circuitry and audio circuitry carried by the circuit board;

mounting a transducer housing and associated audio transducer on the circuit board so that at least one resilient electrical contact pad on the transducer housing couples the audio transducer to the audio circuitry; and

mounting at least one filter within the transducer housing.

20. The method according to claim 19, wherein the at least one resilient electrical contact pad comprises a plurality thereof.

21. The method according to claim 19, wherein the at least one filter comprises at least one ferrite bead.

22. The method according to claim 19, wherein the at least one filter comprises at least one surface mount filter.