Optical disk tracking and seeking systems and specific track formats (servo areas)

Abstract From the Canadian patent

This invention relates to the field of data recording by optical or radiation means and in particular to optical disk technology. It provides for media configurations which can be read by systems such as those described within. The combinations described can provide accurate track crossing count and a more accurate track following signal than previously available. The media employs substantially parallel tracks to act as a diffraction grating, creating a push-pull signal which varies in a sine-wave fashion as the radiation spot used for reading or writing information in the tracks moves substantially perpendicularly across a group of track lengths. This creates the track count. The same …