US 7,407,596 B2 · Fluxgate sensor integrated in printed circuit board and method for manufacturing the same

Abstract

A fluxgate sensor is integrated in a printed circuit board. The fluxgate sensor has two bar-type (or rectangular-ring shaped) soft magnetic cores to form a closed magnetic path on a printed circuit board and an excitation coil in the form of a metal film is wound around the two bar-type soft magnetic cores either in a united structure that winds the two bar-type soft magnetic cores altogether, or in a separated structure that winds the two bar-type soft magnetic cores respectively, both in a pattern of number ‘8’. A pick-up coil is mounted on the excitation coil, either winding the two bars altogether, or respectively, in a solenoid pattern. The fluxgate sensor integrated in the printed circuit board can be mass-produced at a cheap manufacturing cost. The fluxgate sensor also can be made compact-sized, and at the same time, is capable of forming a closed-magnetic path. As a result, flux leakage is minimized, and the fluxgate sensor has a high sensitivity as it detects the magnetic field through a variable driving.

Claims19

Dependent claims

A manufacturing method of a fluxgate sensor, comprising the steps of:

bonding a prepreg and a soft magnetic film on a first metal plate;
forming a soft magnetic core by etching the soft magnetic film;
forming a first substrate by bonding a prepreg and second metal plates on an upper portion of the soft magnetic core;
forming first via holes in the first substrate, at locations horizontally distanced away from one and the other sides of the soft magnetic core;
metal-plating the first via holes;
forming an excitation coil on both surfaces of the substrate by etching;
forming a second substrate by bonding a prepreg and third metal plates on both portions of the excitation coil;
forming second via holes in the second substrate, corresponding to the first via holes;
metal-plating the second via holes;
forming a pick-up coil by etching both surfaces of the second substrate;
forming a third substrate by bonding a prepreg and fourth metal plates on both portions of the pick-up coil;
and
forming a pad for an electrical conductivity, by etching both surfaces of the third substrate.

10 more elements

Dependencies are inferred from the claim text.

Fluxgate sensor integrated in printed circuit board and method for manufacturing the same

Life of this patent

Fluxgate sensor integrated in printed circuit board and method for manufacturing the same

Life of this patent

Abstract

Claims19