Patent ID: 8994367
Filing Date: 2015-03-31
Classification: G01R

Abstract:
1. A differential transformer type magnetic sensor, comprising: a substrate; a drive coil including a planar coil arranged on the substrate; a first differential coil including a planar coil arranged on the substrate and configured to generate an electromotive force when the drive coil is driven; a second differential coil including a planar coil arranged on the substrate, connected to the first differential coil and configured to generate an electromotive force when the drive coil is driven; and a first selector unit used for a zero adjustment of a differential transformer formed by the drive coil, the first differential coil and the second differential coil; wherein: the first differential coil includes a plurality of first branch lines formed by branching a wire material forming the outermost turn of the first differential coil; the plurality of first branch lines are so arranged that the amount of magnetic fluxes passing along the plurality of respective first branch lines differ when the drive coil is driven; and the first selector unit is capable of selecting any one of the plurality of first branch lines and arranged on the substrate.