Optical recording medium

Details Optical recording medium Optical recording medium

2006-05-23

2006-05-23

Psitos, A M (Department: 2653)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S275100

Reexamination Certificate

active

07050385

ABSTRACT:
An optical recording medium comprising at least a land and a groove where information-recording/reproducing is carried out by a flying type optical head, The optical recording medium keeps the flying height of the flying optical head constant in the entire region of the recording/reproducing area, and is provided with at least one characteristic among the following characteristics: RP which is dependent on land and groove parameters and the flying height satisfies the relation of H>Rp 0.1 H; centerline mean roughness Ra is in the range of 0.2 nm Ra 2.0 nm, and the layer thickness of a liquid lubricant layer satisfies the relation of t Ra; the relation of ΔRp≦λ/16 NA which is dependent on the effective numerical aperature, laser wavelength and surface parameters is satisfied where all parameters in the formula are defined in the specification; and the height of a header area is different from the height of a land portion.

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Y. Sabi et al., “Noise Improvement for a High NA MO System”, proceedings of Magneto-Optical Recording International Symposium '99, J. Magn. Soc. Jpn., vol. 23, Supplement, No. S1 (1999), pp. 269-272 © 1999 by The Magnetics Society of Japan.

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