Patent ID: 8286489
Filing Date: 2012-10-16
Classification: G06F,H01P,H03K

Abstract:
1. An input apparatus comprising: a substrate on a surface of which a signal line is formed; an insulating sheet disposed facing the surface of the substrate and having information, which represents a plurality of operating positions, displayed on a surface thereof that is on a side opposite a surface facing the substrate; a signal transmitter that outputs a signal with a single frequency to the signal line while varying the frequency over a predetermined frequency range; a reflected-wave detector that detects, as received-signal strength information, a signal strength of a reflected wave of the signal output by the signal transmitter; and a computing unit that computes a frequency-domain reflection coefficient based upon the received-signal strength information and transmit-signal strength information indicative of a strength of the signal output by the signal transmitter, subjects the computed frequency-domain reflection coefficient to an inverse Fourier transform to compute a time-domain reflection coefficient, and discriminates an operating position at which an operation has been performed, wherein the signal line is formed so as to lengthen a distance between a portion that passes through the vicinity of the operating position in the insulating sheet and a portion that passes through the vicinity of another operation position.