POSITION DETECTION DEVICE, ELECTRONIC APPARATUS, RECORDING DEVICE, ROBOT, AND POSITION DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To detect the position of a mobile entity with high accuracy.SOLUTION: A position detection device 20 detects the position of a mobile entity R using a first detection signal Sand a second detection signal Sthe voltage values of which change in conjunction with the movement of the mobile entity R and which mutually have a phase difference, the position detection device 20 comprising: a difference calculation unit 22 for calculating a first difference value ΔVthat is a difference between the center voltage Vof the first detection signal Sand the voltage value Vof the first detection signal S, and a second difference value ΔVthat is a difference between the center voltage Vof the second detection signal Sand the voltage value Vof the second detection signal S; a ratio calculation unit 24 for calculating an adjustable ratio index W corresponding to the ratio of a difference value between the absolute value |ΔV| of the first difference value ΔVand the absolute value |ΔV| of the second difference value ΔVto the added value of the absolute value |ΔV| of the first difference value ΔVand the absolute value |ΔV| of the second difference value ΔV; and a position specification unit 28 for specifying the position of the mobile entity R using the adjustable ratio index W.SELECTED DRAWING: Figure 5