Patent ID: 8773148

Claim:
A centroid position detector device, comprising: a load measuring part fitted in contact with a sole side of a foot of a person and configured to measure a value of a load on the sole side of the foot of the person based on a capacitance that varies according to a shift of a weight of the person; and a centroid detecting unit configured to detect a position of a center of gravity of the person based on a change in the load value measured based on the capacitance by the load measuring part, wherein the load measuring part includes a sheet-like elastic plate having elasticity, an upper electrode bonded to a top surface of the elastic plate, and a lower electrode bonded to a bottom surface of the elastic plate; wherein the load measuring part is arranged to detect a capacitance between the upper electrode and the lower electrode; and wherein one of the upper and lower electrodes is grounded, the other of the upper and lower electrodes is connected to a constant-voltage power source, and the capacitance is computed based on a time taken by a value of a voltage between the upper electrode and the lower electrode to reach a predetermined value.