Magnetic Sensor Bridge Circuit Resists Resistance Variation

The patent applies local quality by making the extended portions of the thin film conductor have different material properties than the magnetoresistance patterns. Specifically, the extended portions are made of a non-magnetoresistive material to eliminate resistance variation during magnetic medium movement, while the magnetoresistance patterns maintain their magnetoresistive properties for position detection. This localized differentiation resolves the contradiction between manufacturing simplicity and positioning accuracy.

The patent segments the thin film conductor into two distinct parts: extended portions made of non-magnetoresistive material and regions forming the bridge circuit made of magnetoresistive material. This segmentation allows each part to have optimized material properties for its specific function while enabling a single manufacturing process to produce both types of conductors with different materials, thus resolving the contradiction between positioning accuracy and manufacturing complexity.

The patent implements local quality by assigning different material characteristics to different regions of the thin film conductor. The extended portions use non-magnetoresistive material to maintain constant resistance and ensure positioning accuracy, while the bridge circuit regions use magnetoresistive material for position detection functionality. This localized material differentiation eliminates the need for multiple manufacturing processes while achieving both positioning accuracy and functional requirements.