Electro-magnetic interference shield for a telephone handset

• US 5,819,162 A
• Filed: 07/31/1996
• Issued: 10/06/1998
• Est. Priority Date: 09/29/1995
• Status: Expired due to Fees

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Northern Telecom Limited (Nortel Networks Corporation)
• Inventors: Lynch, Michael J., Spann, Charles L.
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US08/688,862
• Time in Patent Office: 797 Days
• Field of Search: 455/90, 455/100, 455/550, 455/575, 455/300, 455/117, 455/95, 455/97, 455/106, 379/428, 379/430, 379/431, 379/437, 379/440, 379/52, 379/432, 379/433, 343/702, 343/841, 343/851, 343/872, 439/610, 361/814, 361/816-818
• US Class Current: 455/575.5
• CPC Class Codes: H01Q 1/245 with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
• CPC Class Codes: H01Q 1/526 Electromagnetic shields
• CPC Class Codes: H04B 1/3833 Hand-held transceivers

Abstract

An electromagnetic interference (EMI) shield for a handheld cellular phone that is particularly useful for shielding a hearing aid against EMI from the phone'"'"'s antenna. The device includes a base and a flap laminated with a metallic shielding. The base attaches to the receiver end of the cellular phone and the flap rests over the base when the phone is not in use. In operation, the flap extends away from the base forming an enclosure about the user'"'"'s ear for shielding the hearing aid from EMI when the phone is in use.

Claims

1. A device for providing an electromagnetic interference (EMI) protected zone comprising:

a base for attachment to a hand-held cellular telephone;

a flap comprising a metallic shielding laminated material; and

means for coupling said flap to said base for allowing displacement of said flap between a storage mode when said flap rests over said base, and an operating mode when said flap extends away from said base to form said EMI protected zone about a user'"'"'s ear.

2. A device as claimed in claim 1, wherein said base comprises a metallic shielding laminated material placed between two layers of insulating material.

3. A device as claimed in claim 1, wherein said base comprises:

a generally rectangular flat base plate defining two lateral sides, a front side and a back side; and

means for attaching said base plate to the receiver end of said telephone.

4. A device as claimed in claim 3, wherein said base comprises a metallic shielding laminate material placed between two layers of insulating material, and said laminate extends over substantially the entire area of said base plate.

5. A device as claimed in claim 4, wherein said laminate has a thickness of heavy letter bound paper.

6. A device as claimed in claim 3, wherein said means for attaching is a pair of brackets, each provided at a lateral side of said base plate.

7. A device as claimed in claim 1, wherein said flap comprises:

a generally rectangular flat panel defining two lateral edges, a hinging edge and a free edge; and

a pair of wings, each provided at a lateral edge of said panel and generally oriented perpendicular to said panel.

8. A device as claimed in claim 1, wherein said metallic shielding laminated material of said flap is placed between two layers of insulating material, and said laminate extends over substantially the entire area of said panel and said wings.

9. A device as claimed in claim 1, wherein said device further comprises means for locking said flap over said base in said storage mode.

10. A device for shielding a hearing aid against electromagnetic interference (EMI), comprising:

a base for attachment to a hand-held cellular telephone;

a flap comprising a metallic shielding laminated material; and

means for coupling said flap to said base for allowing displacement of said flap between a storage mode when said flap rests over said base, and an operating mode when said flap extends away from said base to form an EMI protected zone about a user'"'"'s ear.

11. A device as claimed in claim 10, wherein said base comprises a metallic shielding laminate material laced between two layers of insulating material.

12. A device as claimed in claim 10, wherein said base comprises:

a generally rectangular flat base plate defining two lateral sides, a front side and a back side, said base plate being sized to extend over the front face of the receiver end of said telephone, between a front transverse edge and a display of said telephone; and

means for attaching said base plate to the receiver end of said telephone.

13. A device as claimed in claim 12, wherein said means for attaching is a pair of brackets, each provided at a lateral side of said base plate.

14. A device as claimed in claim 10, wherein said base comprises a metallic shielding laminate material placed between two layers of insulating material, and said laminate extends over substantially the entire area of said base plate.

15. A device as claimed in claim 10, wherein each said bracket is provided with a clip sized to catch on a corresponding groove provided on a respective lateral side of said receiver end.

16. A device as claimed in claim 10, wherein said flap comprises:

a generally rectangular flat panel defining two lateral edges, a hinging edge and a free edge, said panel being dimensioned to extend over the antenna of said telephone, when in operating position; and

a pair of wings, each provided at a lateral edge of said panel and generally oriented perpendicular to said panel,

said wings in combination with said panel providing said EMI protected zone, when said telephone is in use.

17. A device as claimed in claim 16, wherein said metallic shielding laminated material of said flap is placed between two layers of insulating material, and said laminate extends over substantially the entire area of said panel and said wings.

18. A device as claimed in claim 17, wherein said laminate has a thickness of heavy letter bound paper.