Coordinates input apparatus.

摘要

A coordinate input apparatus has a tablet (1) including X- and Y-direction position detecting portions having a multiplicity of loop coils arranged in parallel with one another in X- and Y-directions, respectively, the X- and Y-direction position detecting portions being superposed one on the other. The apparatus also has a position appointing device (2) incorporating a tuning circuit capable of making resonance with electric wave produced from one of the loop coils. The loop coils are successively selected in a one-by-one fashion and an A.C. signal of a predetermined frequency is supplied to the thus selected loop coil. The position appointed by the position appointing device is detected by sensing the induced voltage of a frequency substantially equal to the predetermined frequency of the A.C. voltage, through a processing by a suitable processing device (4). Since the position appointing device need not be connected to any stationary portion of the apparatus, the coordinates data can be input with a high degree of meneuverability and at a distinguished precision. It is also possible to display the data input through the position appointing device or the data transmitted thereto through a transmission line (9).