SPHERICAL ABERRATION CORRECTION USING FLYING LENS AND METHOD

摘要

An optical access device for a moving optical data storage media having a flying lens (20) near an outer surface of the media (12), and an objective lens (18) spaced from the flying lens, with the flying lens and objective lens co-operating to substantially offset a variable range of negative spherical aberration occurring in the media by forming a positive spherical aberration which substantially cancels the negative spherical aberration.