Optical card having guide patterns for information line positioning and optical card recording/reproducing apparatus

摘要

A guide pattern used to position a light spot on a desired information line is formed in each track formed of a plurality of information lines. Light reflected from this guide pattern is converted into electrical signals by a photodetector, and a signal indicating a positional deviation from each information line is generated. A mirror is driven by a piezoelectric element, and a recording light beam is irradiated onto one of the information lines. Information lines traversed are counted on the basis of the positional deviation signal outputted when the information lines are traversed. Positioning on the desired information line is performed on the basis of the counted value.