Patent ID: 7005843
Filing Date: 2006-02-28
Classification: G06F,H03M

Abstract:
1. A position indicator that converts operation information represented as a continuous quantity into the length of time, that codes the length of time by counting the number of alternating current signals at a specified frequency, and that transfers the operational information represented as the continuous quantity to the side of a tablet by varying signals to be sent to the tablet side in accordance with the code, the position indicator comprising: a time-constant circuit that includes an element of which the characteristic continuously varies in response to an operation represented as a continuous quantity, and that can switch the variation range of a time constant in response to the variation in the characteristic of the element in at least two ways; and discharging/charging means capable of discharging the time-constant circuit from a predetermined voltage to a voltage below a specified voltage, or charging the time-constant circuit from the predetermined voltage to a voltage exceeding the specified voltage, wherein, using the time-constant circuit and the discharging/charging means, the number of waves of alternating current signals at the specified frequency is counted from the time of a discharge start to the time when the voltage falls below the specified voltage, or from the time of a charge start to the time when the voltage exceeds the specified voltage, by switching the variation range of the time constant.