MR Sensor Bias Field Layout for Inclined Surface Detection

The magnetic field generator is designed with non-uniform thickness, where the first part has a greater thickness than the second part. This local quality variation ensures that the magnetoresistive element positioned near the thicker first part receives a sufficient bias magnetic field strength, while the overall generator volume remains reduced due to the thinner second part. This resolves the contradiction by optimizing the local thickness distribution rather than uniformly reducing the entire generator volume.

The patent introduces a thickness dimension variation within the magnetic field generator structure, creating a three-dimensional thickness profile where the first part extends further than the second part. This dimensional approach allows the generator to maintain adequate bias field strength at critical locations (where magnetoresistive elements are positioned) while reducing overall volume, thereby detecting perpendicular magnetic field components effectively.

Instead of uniformly increasing the volume of all magnetic field generators, the patent applies local quality enhancement by making only the first part of each generator thicker than the second part. This localized thickness increase concentrates the magnetic field generation capability where it is most needed (at the position of magnetoresistive elements) while maintaining smaller overall generator volumes, thus preserving integration density.

The patent changes the thickness parameter of the magnetic field generator in a non-uniform manner, creating a thickness gradient where the first part has greater thickness than the second part. This parameter variation allows optimization of bias magnetic field strength at specific locations without proportionally increasing the total volume, thereby maintaining high integration density while ensuring sufficient bias field strength.