Piezo-electric sensing unit and data input device using piezo-electric sensing

A data input device, comprising:

• a base;
• an input unit provided on the base, the input unit performing a second directional input in such a way that the input unit is tilted towards one of second direction indicating locations which are radially provided on the input unit at positions spaced apart from each other, or in such a way that one of push parts which are provided in the input unit at positions corresponding to the respective second direction indicating locations is selected;
• a second piezoelectric sensing part provided between the input unit and the base, the second piezoelectric sensing part generating a second sensing signal proportional to a tilting pressure of the input unit or a pushing pressure applied to the corresponding push part when the second directional input is performed;
• and
• a control unit to extract and input data from a memory unit when the second sensing signal is greater than a preset value, the data being assigned to the corresponding second direction indicating location at which the tilting of the input unit or the selection of the corresponding push part is sensed.

A data input device, comprising:

• an input unit provided so as to be tiltable from a horizontal state to first radial directions;
• a plurality of first piezoelectric sensing parts provided below the input unit at positions corresponding to the respective first radial directions, each of the first piezoelectric sensing parts generating a first sensing signal proportional to a tilting pressure of the input unit;
• a plurality of second piezoelectric sensing parts provided around outer edges of the first piezoelectric sensing parts at positions corresponding to respective second directions, each of the second piezoelectric sensing parts generating a second sensing signal proportional to a pushing pressure;
• a plurality of push parts provided on the respective second piezoelectric sensing parts;
• and
• a control unit to extract and input data from a memory unit when the first sensing signal or the second sensing signal is greater than a preset value, the data being assigned to the radial direction corresponding to the corresponding piezoelectric sensing part.

A piezoelectric sensing unit, comprising:

• a piezoelectric sensing part for forming a sensing area in which a plurality of pressing locations is distributed, the piezoelectric sensing part being made of elastic material and outputting a sensing signal proportional to a pressing force applied to one of the pressing locations;
• a conductive elastic member provided on a first side of the piezoelectric sensing part, the conductive elastic being connected to one of a grounding and a control unit;
• connection terminals provided on a second side of the piezoelectric sensing part at positions corresponding to the respective pressing locations, the connection terminals being connected to a remaining one of the grounding and the control unit;
• and
• the control unit to determine a pressing of the piezoelectric sensing part when the sensing signal transmitted to the control unit is greater than a preset value, the control unit determining the pressing location from the relevant connection terminal from which the sensing signal is transmitted to the control unit.