Miniature shield with opposing cantilever spring fingers

• US 4,890,199 A
• Filed: 11/04/1988
• Issued: 12/26/1989
• Est. Priority Date: 11/04/1988
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Beutler, Scott D.
• Primary Examiner(s): Tolin, Gerald P.
• Application Number:
  US07/267,419
• Time in Patent Office: 417 Days
• Field of Search: 439/607, 267/160, 174/35 R, 174/35 MS, 455/300, 455/301, 455/344, 455/347, 455/349, 334/85, 361/212, 361/220, 361/386, 361/388, 361/391, 361/395, 361/399, 361/417, 361/419, 361/420, 361/422, 361/424, 361/427
• US Class Current: 361/818
• CPC Class Codes: H04M 1/0202 Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets constructional features of telephone transmitters or receivers, e.g. of speakers or microphones H04M1/03
• CPC Class Codes: H05K 9/0032 having multiple parts, e.g. frames mating with lids
• CPC Class Codes: H05K 9/0035 with retainers mounted beforehand on the PCB, e.g. clips
• CPC Class Codes: Y10S 174/34 PCB in box or housing

Abstract

A miniature shield with opposing cantilever spring fingers is disclosed. Shield walls, which may be part of a housing for electronic equipment, are designed to insert between a plurality of opposing cantilever spring fingers arranged in a "U"-shaped channel. Torque generated at the bottom of the "U"-shaped channel is minimized by the opposing cantilever spring fingers and enables the channel to be reflow soldered to an electronic circuit board.

Claims

1. An electromagnetic shield apparatus for miniature electronic circuitry on a substrate which is at least partially surrounded by a housing, comprising:

an essentially "U"-shaped conductive channel further comprising;

a plurality of pairs of opposing cantilever spring fingers attached to an elongated planar common base,

a first spring finger of said plurality of pairs of opposing cantilever spring fingers extending away from the plane of said base at a first obtuse angle and an opposing second spring finger of said plurality of pairs of opposing cantilever spring fingers extending away from the plane of said base at a second obtuse angle, such that said first and said opposing second spring fingers approach each other,

each said first and said opposing second of said pair of spring fingers further having an end portion extending in a direction away from said opposing second and said first spring finger respectively;

a conductive area on the substrate connected to the electronic circuitry and to which said "U"-shaped conductive channel is electrically coupled; and

a shield portion comprising a raised conductive segment of the housing which is disposed at least between said first and opposing second spring fingers.

2. An electromagnetic shield apparatus in accordance with claim 1 wherein said first and said opposing second spring fingers extend in a direction away from each other at an acute angle relative to said plane of said base.

3. An electromagnetic shield apparatus in accordance with claim 1 wherein said conductive area further comprises a reflow solder surface.

4. A portable radiotelephone having a housing with a conductive material covering at least a portion of the inside surface of the housing and having electronic circuitry substantially enclosed in the housing, comprising:

a substrate with the circuitry thereon disposed within the housing;

an essentially "U"-shaped conductive channel further comprising;

a plurality of pairs of opposing cantilever spring fingers attached to an elongated planar common base,

a first spring finger of said plurality of pairs of opposing cantilever spring fingers extending away from the plane of said base at a first obtuse angle and an opposing second spring finger of said plurality of pairs of opposing cantilever spring fingers extending away from the plane of said base at a second obtuse angle, such that said first and said opposing second spring fingers approach each other,

each said first and said opposing second of said pairs of spring fingers further having an end portion extending in a direction away from said opposing second and said first spring finger respectively;

a raised conductive wall portion disposed on the inside surface of the housing and further disposed between each said first and said opposing second of said pairs of spring fingers; and

a conductive area disposed on said substrate essentially opposite said raised conductive wall and to which said "U"-shaped conductive channel is electrically connected.

5. A portable radiotelephone in accordance with claim 4 wherein each said first and said opposing second of said pairs of spring fingers extend in a direction away from each other at an acute angle relative to said plane of said base.

6. A portable radiotelephone in accordance with claim 4 wherein said "U"-shaped conductive channel is reflow soldered to said conductive area.