Shielded keyboard for a portable communication device

Details Shielded keyboard for a portable communication device Shielded keyboard for a portable communication device

1998-01-15

2000-03-28

Chiang, Jack

Telephonic communications

Terminal

Housing or housing component

379368, H04M 100

Patent

active

060441526

ABSTRACT:
The present invention provides an improved keyboard for a cellular telephone or the like. The improved keyboard includes an additional shielding layer which is added to the keypad to prevent RF leakage in the direction of the user. The shielding layer includes an insulating layer and a conductive layer. The conductive layer may be added in one of two ways. First, a conductive layer made of nickel foil or other suitable material may be molded directly into the keypad. Second, the conductive layer may be plated or painted on the surface of the keypad. In any such process, a layer of insulating material is added to the bottom surface of the conductive layer to prevent shorts. Finally, doping of the keypad may be used to improve the effectiveness of the shielding by using it with either of the aforementioned methods of implementation.

REFERENCES:
patent: 5153590 (1992-10-01), Charlier
patent: 5266949 (1993-11-01), Rossi
patent: 5271056 (1993-12-01), Pesola et al.
patent: 5274693 (1993-12-01), Waldman
patent: 5365570 (1994-11-01), Boubelik
patent: 5402481 (1995-03-01), Waldman
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patent: 5514319 (1996-05-01), Young
patent: 5572571 (1996-11-01), Shirai
patent: 5584546 (1996-12-01), Gurin et al.
patent: 5588041 (1996-12-01), Meyer et al.
patent: 5661793 (1997-08-01), Tanji et al.

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