Patent ID: 8694280
Filing Date: 2014-04-08
Classification: B82Y,G01N

Abstract:
1. A circuit for controlling a head module to detect antigens from a biosample track, the head module having a position-error-servo (PES) read sensor for reading Z-pattern servo-alignment marks along the biosample track, the circuit comprising: a processor for: receiving position-error-servo signals from the PES read sensor as the head module moves along the biosample track, determining from the position-error-servo signals a first distance along the direction of the biosample track between a bottom line of the Z-pattern to the diagonal line of the Z-pattern, determining from the position-error-servo signals a second distance along the direction of the biosample track between the diagonal of the Z-pattern to a top line of the Z-pattern, and determining a position of the head module in a direction perpendicular to the biosample track from a difference between the first distance and the second distance; an electromagnetic write head for magnetizing a plurality of nanoparticles labeling the antigens; a magneto-resistive read sensor for detecting the antigens via the nanoparticles, the write head and the read sensor being part of the head module; and a plurality of actuators coupled to the head module for controlling the motion of the head module based on the position-error-servo signals.