US 2003/0210642 A1 · Optical recording medium

Abstract

The optical recording medium of the present invention is a phase change optical recording medium which can be used as a write once medium and which can be recorded at a high recording density. The optical recording medium of the present invention is adapted for recording such that, when the recording beam has a wavelength of λ, and objective lens of recording optical system has a numerical aperture of NA, minimum record marks formed are circular or ellipsoidal marks having a length of 0.4λ/NA or less; and the medium is a write once medium wherein the recorded information can not be erased or rewritten at the minimum linear velocity used.

Claims5

Dependent claims

An optical recording medium wherein p1 the medium has a phase change recording layer wherein the recording is accomplished such that, when the recording beam has a wavelength of λ, and objective lens of recording optical system has a numerical aperture of NA, minimum record marks formed are circular or ellipsoidal marks having a length of 0.4λ/NA or less;

and
the medium is a write once medium wherein the recorded information can not be erased or rewritten at the minimum linear velocity used.

Dependencies are inferred from the claim text.

Facts

Application

10/445,341Filed 27 May 2003

Priority

JP 2000-35925227 Nov 2000

Published

13 Nov 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

G11B 7/26
Record carriers characterised by shape, structure or physical properties, or by the selection of the material: apparatus or processes specially…
G11B 7/00
Recording or reproducing by optical means
G11B 7/00375
With discs: arrangements for detection of physical defects, e.g. of recording layer
G11B
Information storage based on relative movement between record carrier and transducer

Optical recording medium

Life of this patent

Optical recording medium

Life of this patent

Abstract

Claims5