Patent ID: 6061322
Filing Date: 2000-05-09
Classification: B82Y,G11B

Abstract:
A data storage system for using radiation energy to read or write data from or to an optical recording medium having at least two recording layers spaced from each other by less than one wavelength of the radiation energy, comprising:an optical imaging module configured to have a combination lens and to have an adjustable focus; andan optical head disposed relative to said optical imaging module and configured to have (1) a slider, (2) a solid immersion lens fixed to said slider and having a partial spherical surface and a substantially flat surface, and (3) an objective lens fixed to said slider to be spaced by a predetermined distance relative to said solid immersion lens,wherein said imaging optical module and said optical head are operable to focus the radiation energy to at least two different positions spaced away from said flat surface of said solid immersion lens by two different distances that are less than one wavelength of the radiation energy by adjusting the focus of said optical imaging module for reading and writing information in at least two different recording layers in an optical recording medium.