Patent ID: 11953562
Assignee: NIDEC READ CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 4:
5. A method for manufacturing an MI sensor comprising:
an insulation step of forming an insulator layer on an outer peripheral surface of a linear magnetic conductor;
a conductive layer formation step of forming a conductive layer on an outer peripheral surface of the insulator layer;
a resist step of forming a resist layer on an outer peripheral surface of the conductive layer;
an exposure step of exposing the resist layer with a laser to form a first groove strip, a second groove strip, and a third groove strip each having a spiral shape on an outer peripheral surface of the resist layer, form a first gap that surrounds the resist layer between the first groove strip and the second groove strip on the outer peripheral surface of the resist layer, and form a second gap that surrounds the resist layer between the second groove strip and the third groove strip on the outer peripheral surface of the resist layer;
an etching step of performing etching using the resist layer as a masking material and removing the conductive layer in the first groove strip, the second groove strip, the third groove strip, the first gap, and the second gap to form a first coil with the conductive layer remaining around the first groove strip, form a second coil with the conductive layer remaining around the second groove strip, and form a third coil with the conductive layer remaining around the third groove strip; and
a bending step of bending the magnetic conductor and the insulator layer between the first coil and the second coil and between the second coil and the third coil to arrange the first coil, the second coil, and the third coil in directions orthogonal to each other.