Key data input device and mobile communication terminal using the same

A one-keyed data input device for a mobile communication terminal, comprising:

• a recess portion formed on a top surface of a main body of a terminal;
• a center key positioned in the recess portion, said center key being arranged to be movable in an uppermost or lowermost direction or in a leftmost or rightmost direction from the center of the recess portion and movable in a radial direction from the center;
• and
• a data input assembly having a signal generation guide assembly for generating, after moving the signal generation guide assembly to a desired location and depressing the the center key, an electrical signal for selected data, said signal generation guide assembly being moveable together with the center key coupled thereto, a vertically moving conductive material disposed below and in contact with the signal generation guide assembly, a first elastic guide body disposed below the vertically moving conductive material for providing the vertically moving conductive material with a force to make contact with the signal generation guide assembly, a base supporting the first elastic body and the signal generation guide assembly, the base for transferring an electrical signal to a main printed circuit board,
• wherein the electrical signal inputs different data depending upon the desired location of the center key.