Patent ID: 7229746

Claim:
A method for forming a magnetic track for a position sensor on a target substrate, comprising: forming a material layer on a surface of the substrate wherein the material layer comprises a photoresist: forming a trench in the material layer wherein the step of forming the trench further comprises: positioning a mask over the photoresist layer, wherein the mask includes one or more relatively transparent regions and one or more relatively opaque regions; exposing the mask to electromagnetic radiation, causing the regions of the photoresist layer subjected to the radiation to undergo a structural change; and removing regions of the photoresist layer, wherein the removed regions comprise the regions that underwent a structural change or the regions that did not undergo a structural change, such that the remaining regions of the photoresist layer define the trench; disposing a paste within the trench, wherein the paste comprises magnetic powder and a hardenable carrier; magnetizing the magnetic powder; and leaving the remaining regions of photoresist in place.