EMI shield device for mobile phone

Details EMI shield device for mobile phone EMI shield device for mobile phone

2000-08-21

2002-04-23

Gaffin, Jeffrey (Department: 2841)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C361S801000, C361S800000, C361S804000, C439S607560, C439S939000

Reexamination Certificate

active

06377473

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a shield device for shielding electronic components on a printed circuit board, and particularly to an EMI Shield easily assembled to and disassembled from a printed circuit board of a mobile phone.
BACKGROUND OF THE INVENTION
Mobile phones are subject to external EMI which can result in signal distortion. Thus, EMI sensitive electronic components on a printed circuit board of a mobile phone are conventionally protected from EMI by a shield. Referring to
FIG. 3
(prior art), a conventional EMI shield in a mobile phone (not labeled) comprises a shield
51
soldered onto a printed circuit board (PCB)
52
to shield electronic components (not labeled) on the PCB
52
. An upper cover
50
and a lower cover
53
are assembled together to enclose the PCB
52
and the shield
51
therein. The shield
51
is required to be fixed on the PCB
52
via a soldering process, which is not convenient. Furthermore, in order to replace or repair the electronic components, the shield must be desoldered from the PCB. This makes any repairs inconvenient and cumbersome.
U.S. Pat. No. 5,748,455 discloses one solution to the problem mentioned above. Referring to
FIG. 4
(prior art), a lower cover
67
forms a plurality of posts
69
therein, each post defining a threaded hole (not labeled) therethrough for engaging with a corresponding screw
70
. A PCB
61
defines a plurality of threaded holes
62
corresponding to the posts
69
. A shield
63
defines a plurality of cutouts
66
at edges thereof for fitting to the periphery of the posts
69
. A plurality of spring pieces
64
sidewisely extends from edges of the shield
63
, and a plurality of retaining pieces
65
perpendicularly projects from edges of the shield
63
adjacent the spring pieces
64
. In assembly, the spring pieces
64
abut the PCB
61
, and the retaining pieces
65
abut an inner wall
68
of the lower cover
67
and the PCB
61
. The screws
70
are extended through the posts
69
and threaded holes
62
of the PCB
61
and are secured in an upper cover
60
. Therefore, the upper and lower covers
60
,
67
, the shield
63
and the PCB
61
are fixedly assembled together.
The prior art, comprising posts, threaded holes, screws, spring pieces, and retaining pieces, is unduly complicated and cumbersome. The prior art shield is designed to shield the entire PCB, whereas only certain components on the PCB need be shielded to obtain the desired protection from external EMI.
Therefore, a mobile phone with simplified shielding design is desired.
BRIEF SUMMARY OF THE INVENTION
A main object of the present invention is to provide an EMI shield device for use in a mobile phone, wherein a shield is easily detached from the phone's printed circuit board (PCB). This simplifies repair or replacement of electronic components on the PCB.
A shield device in accordance with the present invention comprises an upper and a lower covers, a shield and a fastening portion. The upper cover forms a plurality of latches along opposite sides of a lower surface thereof. The shield has a top wall and side flanges depending downwardly from edges of the top wall. A plurality of holes is defined in opposite side flanges of the shield for engaging with the latches, thereby securing the shield onto the upper cover. The upper and the lower covers are assembled together to enclose the PCB and the shield therein, the shield shielding the electronic components on the PCB.
An alternative fastening portion comprises screws and an upper cover with internal threaded posts downwardly depending from the lower face of the upper cover.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 5495399 (1996-02-01), Gore et al.
patent: 5748455 (1998-05-01), Phillips et al.
patent: 6206728 (2001-03-01), Krehbiel et al.

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