Position detecting device and position input device

A sensor substrate comprising:

• a plurality of first loop coils that are arranged in a first direction and configured to carry out operation of one of generating a magnetic field and detecting a magnetic field;
• a plurality of second loop coils that are arranged in a second direction intersecting with the first direction and configured to carry out operation of one of generating a magnetic field and detecting a magnetic field;
• and
• an auxiliary loop coil provided at a corner part of an area in which the first loop coils and the second loop coils are arranged.

A position input device comprising:

• a position indicator including at least one coil;
• and
• a position detecting device including a detecting plane configured to receive indication by the position indicator, the position detecting device being configured to detect a position indicated by the position indicator, wherein
• the position detecting device includes
• a sensor unit including a plurality of first loop coils that are arranged in a first direction and a plurality of second loop coils that are arranged in a second direction intersecting with the first direction,
• a yoke sheet provided on a side of the sensor unit that is opposite to a side of the sensor unit that faces the position indicator,
• an auxiliary loop coil provided at a corner part of the sensor unit,
• a signal transmitter configured to transmit a signal to one of the first loop coil, the second loop coil, and the auxiliary loop coil in order to generate a magnetic field to induce an induced current in a coil of the position indicator, and
• a controller configured to select one of the first loop coil, the second loop coil, and the auxiliary loop coil, and to control whether to transmit a signal from the signal transmitter to, or receive a signal from the position indicator from, the selected one of the first loop coil, the second loop coil, and the auxiliary loop coil.