Patent ID: 6181130
Filing Date: 2001-01-30
Classification: G01R

Abstract:
A magnetic sensor comprising:a bobbin,a toroidal inductor mounted within said bobbin, said toroidal inductor comprising a toroidal magnetic core and an excitation toroidal coil wound around said toroidal magnetic core, andat least one detection coil wound on said bobbin, wherein said bobbin comprises: (i) a bobbin case having a top surface in which a toroidal groove is formed, with said toroidal inductor being accommodated in said toroidal groove, and (ii) a bobbin cover coupled to said bobbin case to cover said toroidal groove,wherein a conductor pattern is formed on the top surface of said bobbin case, said conductor pattern comprising a plurality of angularly spaced thin-film linear conductors which each radially extend from a center portion of the top surface of said bobbin case across said toroidal groove to a peripheral portion of the top surface of said bobbin case, andwherein a plurality of connecting conductors radially extend over said toroidal magnetic core to connect a radial inner end of a corresponding one of said thin-film linear conductors to a radial outer end of an adjacent one of said thin-film linear conductors so that said excitation toroidal coil is formed by said conductor pattern and said connecting conductors.