Telecommunications – Transmitter and receiver at same station – Having particular housing or support of a transceiver
Reexamination Certificate
2000-04-03
2002-12-03
Le, Thanh Cong (Department: 2684)
Telecommunications
Transmitter and receiver at same station
Having particular housing or support of a transceiver
C455S300000, C361S816000
Reexamination Certificate
active
06490438
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a case structure of a mobile phone, and more particularly to a case structure of a mobile phone providing improved shielding effectiveness.
Electromagnetic Interference (EMI) is a common and well-known problem associated with electronic equipment. EMI concerns are present in the design of mobile phones. Shielding mobile phones from EMI is essential for optimum signal integrity and communication clarity. U.S. Pat. No. 5,271,056 disclosed a mobile phone having means for protecting components on a printed circuit board (PCB) thereof from EMI, as shown in
FIG. 4
of the present application. The mobile phone has a main body (not shown) and a PCB
50
(shown rear side up). A rear side of the PCB is covered by ground foil
501
, as is an edge of a front side. A frame plate
60
of conductive metal or metal-coated plastic comprises a flat plate
601
and a raised edge
602
around a perimeter of and bisecting the flat plate
601
. The PCB
50
is secured to the frame plate
60
by means of screws
70
. The ground foil
501
, which at the edge of the PCB
50
is connected to a strip in the component side of the board
50
, will together with the raised edge
602
and the plate
601
form a shielding means for shielding electronic components on the PCB facing the plate
601
.
The disadvantages of the prior art mobile phone are that it needs an additional metal frame plate
60
and a plurality of screws which are used for securing the PCB
50
to the frame plate
60
, thus increasing manufacturing cost and consuming space. Further, it is laborious to assemble the EMI shielding means. Hence, an improved mobile phone having an EMI shield is required to overcome the disadvantages of the prior art.
BRIEF SUMMARY OF THE INVENTION
A main object of the present invention is to provide a case for a mobile phone, and more particularly to provide a case which includes an improved EMI shield for a mobile phone.
The present invention comprises a front case, a PCB, a conductive elastic member and a rear case. The front and the rear case are made of a conductive metal material. The front case includes a keyboard and a display. The PCB is disposed between the front case and the rear case and has ground traces and electronic components thereon which face the rear case. The rear case includes a bottom, a surrounding sidewall and a cavity defined between the bottom and the surrounding sidewall. The bottom forms rails forwardly extending into the cavity. The rails have a shape in conformity with and aligning with the ground traces of the PCB when the PCB is secured in the rear case. A conductive elastic member is formed on the rails and directly electrically connects the ground traces of the PCB. The front case, the rear case, the rails, the elastic member and the PCB together form an EMI-shielding means for shielding the components of the PCB from EMI.
REFERENCES:
patent: 5966647 (1999-10-01), Sawai
patent: 6275683 (2001-08-01), Smith
Chung Wei Te
Cong Le Thanh
Hai Precision Ind. Co., Ltd.
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