Patent ID: 8766624
Filing Date: 2014-07-01
Classification: G06F

Abstract:
1. A position detector having a first sensor for detecting a position indicated by a first indicator through electromagnetic induction and a second sensor provided in proximity to the first sensor for detecting a position indicated by a second indicator through a detection method other than electromagnetic induction, to be capable of simultaneously detecting the positions indicated by the first and second indicators, the position detector comprising: a signal supply circuit configured to supply a transmission signal used to detect the position indicated by the second indicator to the second sensor; a position indication state determination circuit configured to receive two signals, one output from the first sensor according to the position indicated by the first indicator and the other output from the second sensor according to the position indicated by the second indicator, to determine the position indication state of the first and second indicators; and a signal level control circuit configured to control the level of the transmission signal supplied from the signal supply circuit to the second sensor according to the determination result of the position indication state by the position indication state determination circuit, wherein based on the position indication state determined by the position indication state determination circuit, if a transition occurs from a non-simultaneous state, in which one of the first and second indicators indicates a position non-simultaneously, to a simultaneous state in which both the first and second indicators indicate positions simultaneously with each other, the signal level control circuit supplies, to the second sensor, a transmission signal different in level from that supplied to the second sensor in the non-simultaneous state.