Data recording and readingout system

Details Data recording and readingout system Data recording and readingout system

2005-09-02

2009-06-30

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07554894

ABSTRACT:
In a data recording and readingout system in which data is recorded and readout, or is readout on, or from an optical recording medium1by irradiating a laser beam having a wavelength “λ” via an objective lens of a numerical aperture “NA” onto said optical recording medium, while the optical recording medium contains a layered structure formed by sandwiching a dielectric layer6between a recording layer7and an optical absorption layer5,with respect to the optical recording medium1arranged in such a manner that data recorded by a recorded mark train can be readout and the recorded mark train contains a recorded mark smaller than, or equal to a limit of resolution, the laser beam is irradiated via the objective lens and a solid immersion lens having a refractive index “n” which is positioned between the optical recording medium and the objective lens, so that the data is recorded and readout, or is readout with respect to the optical recording medium by a recorded mark train which contains a recorded mark smaller than, equal to “λ”/(4·n2·NA).”

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