Patent ID: 8526768

Claim:
A light control device comprising a signal electrode formed on a dielectric anisotropic substrate and ground electrodes disposed with the signal electrode interposed therebetween, wherein the signal electrode includes at least two signal electrode portions disposed in directions in which the dielectric constant of the substrate is different and a curved connecting portion connecting the at least two signal electrode portions, the at least two signal electrode portions have different characteristic impedance, the connecting portion is configured such that a gap between the signal electrode and the ground electrodes in the connecting portion is equal to that in the signal electrode portion in each part connected to the at least two signal electrode portions so that the characteristic impedance in parts connected to the at least two signal electrode portions is equal to that of the corresponding signal electrode portion, and the gap between the signal electrode and the ground electrodes continuously varies in the connecting portion between the at least two signal electrode portions so that the characteristic impedance in the connecting portion between the at least two signal electrode portions continuously varies.