Optical recording/reproducing method for multiple recording...

Details Optical recording/reproducing method for multiple recording... Optical recording/reproducing method for multiple recording...

2008-09-02

2008-09-02

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S283000

Reexamination Certificate

active

11526392

ABSTRACT:
An optical recording and reproducing method is able to record and reproduce information by using an optical system using recording and reproducing light with a wavelength selected in a range of from 780 nm±10 nm and an objective lens with a numerical aperture NA selected in a range of from 0.45±0.01 and records and reproduces first and second optical recording mediums having different recording capacities. The first optical recording medium is constructed by using a substrate with a track pitch Tp1being selected in a range of from 1.5 μm to 1.7 μm and a groove depth d1being selected in a range of from 70 nm to 90 nm, and the second optical recording medium is constructed by using a substrate11with a track pitch Tp2being selected in a range of from 1.2 μm to 1.3 μm and a groove depth d2of the groove12being selected in a range of from 150 nm to 180 nm. This, the optical recording medium has compatibility with existing optical discs and has a recording density high enough to record a moving picture.

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