Patent ID: 9631917
Date: 2017-04-25
CPC Classifications: G01B,G06F

Claim:
1. A position detection apparatus, comprising: a polar coordinate antenna unit including a plurality of first loop antennas of different radii and a plurality of second loop antennas of different angle ranges; a switching unit configured to select one loop antenna at a time from the plurality of first loop antennas, and to select one loop antenna at a time from the plurality of second loop antennas; a transmitting unit configured to transmit an electromagnetic signal through the selected first loop antenna, and to transmit an electromagnetic signal through the selected second loop antenna; a receiving unit configured to receive, from a pointer, a resonance signal corresponding to the electromagnetic signal transmitted through the selected first loop antenna, and to receive, from the pointer, a resonance signal corresponding to the electromagnetic signal transmitted through the selected second loop antenna; and a processor configured to recognize a distribution of a signal strength of each of the plurality of first loop antennas based on the resonance signal received for each of the plurality of first loop antennas, and to recognize a distribution of a signal strength of each of the plurality of second loop antennas based on the resonance signal received for each of the plurality of second loop antennas, so as to extract polar coordinates including a distance value and an angle value of a point on a screen unit indicated by the pointer.