Patent ID: 8982044
Filing Date: 2015-03-17
Classification: G06F

Abstract:
1. A position detector comprising: a position indicator including a coil, the coil being configured to continuously transmit a coil-based signal to a tablet as a position signal and to intermittently transmit the coil-based signal to the tablet as a non-positional signal, the position indicator further including an amplifying circuit and a switch configured to activate the amplifying circuit in synchronization with completion of each continuous transmission of the coil-based signal as the position signal and to deactivate the amplifying circuit after a fixed period of time; and the tablet configured to determine a position on its surface pointed to by said position indicator by detecting the continuously-transmitted coil-based signal, and to determine non-positional information regarding the position indicator by detecting the intermittently-transmitted coil-based signal, wherein said position indicator further includes position indicator control circuitry configured to control the position indicator to: (i) receive, during said fixed period of time, an indicator control signal via the coil from said tablet and amplify the received indicator control signal via the amplifying circuit selectively activated by the switch and deactivate the amplifying circuit after said fixed period of time, and (ii) based on the received and amplified indicator control signal, select one type of non-positional information from among multiple types of non-positional information regarding the position indicator, and (iii) transmit the selected one type of non-positional information regarding the position indicator as the non-positional signal to said tablet via the coil, wherein said tablet includes tablet control circuitry configured to control the tablet to: (a) continuously receive the coil-based signal from said position indicator to determine the positional information and to intermittently receive the coil-based signal from said position indicator to determine the non-positional information, and (b) determine a timing at which the continuous transmission of the coil-based signal is completed, and (c) transmit, during said fixed period of time, the indicator control signal to said position indicator synchronously with the determined timing.