METHOD FOR OPTICALLY ENCODING DIGITAL DATA ON A SUBSTRATE AND THE DATA RECORD CARRIER FORMED THEREBY

摘要

The method for optically encoding digital data (12) on a substrate (11) to form a data record carrier (10) inclues the steps of: selecting a track (14) path on the substrate (11); selecting a data cell length (L) in the direction of the track (14) for each bit of data to be stored in each cell (15) on each track (14); selecting a cell width dimension (W) transverse to the direction of the track (14); selecting an optical non-transition cell (15) for one form of logic (0 or 1) to be stored in each such non-transition cell (15); selecting an optical transition cell (15) for the other form of logic (1 or 0) to be stored in each such other transition cell (15); creating at least one track (14) of digital data (12) on the substrate (11) comprised of a series of cells (15) each having the same cell length (L) in the direction of the track (14); establishing in each non-transition cell (15) on the substrate (11) a fully reflective or transmissive surface or a fully non-reflective or non-transmissive surface; and, establishing in each transition cell (15) on the substrate (11) a reflective or transmissive surface over part of the cell (15) extending transverse to the direction of the track (14) and a non-reflective or nontransmissive surface over the other part of the cell (15) extending transverse to the direction of the track (14).