Patent ID: 7944432

Claim:
A data input device comprising: a detecting unit for detecting an applied force as rectangular coordinate data; a converting unit for converting the rectangular coordinate data detected by said detecting unit into polar coordinate data; a selecting unit for selecting a character to be input in accordance with a θ value of the polar coordinate data converted by said converting unit; a determining unit for determining to input the character selected by said selecting unit in accordance with an r value of the polar coordinate data converted by said converting unit; a first calculating unit for calculating the amount of change of the θ value obtained by said converting unit; a second calculating unit for calculating the amount of change of the r value obtained by said converting unit; and a first judging unit for comparing the amount of change of the θ value calculated by said first calculating unit and the amount of change of the r value calculated by said second calculating unit and judges which of the amounts of change is larger under prescribed conditions; wherein said selecting unit selects the character to be input when said judging unit judges that the amount of change of the θ value is larger and said determining unit determines to input the character selected by said selecting unit when said judging unit judges that the amount of change of the r value is larger.