Patent ID: 8890829

Claim:
A digitizer, comprising: a driving coil supplied with current to induce a magnetic line of force; a sensing coil disposed so as to intersect the driving coil to flow induced current in one direction by the magnetic line of force; and a control unit sensing variation of voltage induced to the sensing coil to calculate coordinates of an input unit when the voltage is changed due to an approach of the input unit, wherein: the sensing coil includes a first line disposed in one direction within an area facing an inner area of the driving coil, a second line spaced apart from the first line so as to be disposed in the other direction within the area facing the inner area of the driving coil, a third line disposed in one direction within an area facing an outer area of the driving coil, and a fourth line spaced apart from the third line so as to be disposed in the other direction within an area facing an outer area of the driving coil, the first line and the third line are connected to each other by a first connection line and the second line and the fourth line is connected by a second connection line, and a direction of magnetic force line of the area facing the inner region of the driving coil is contrary to a direction of magnetic force line of the area facing the outer region of the driving coil.