Super-resolution optical recording medium and method for recording information on super-resolution optical recording medium
AssigneeTDK Corporation
InventorsNarutoshi Fukuzawa, Takashi Kikukawa, Tatsuhiro Kobayashi
Life of this patent
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Abstract
A super-resolution optical recording medium has at least a recording layer and a super resolution layer on a substrate. A recording mark with the size of a resolution limit or less and a space with the size of the resolution limit or less are formed in the super-resolution optical recording medium by adjusting the intensity of a laser for recording or an emission pattern of the laser for recording such that at least the recoding mark with the size of the resolution limit or less out of recording marks in a modulation code is formed into a concave section with respect to a not-recorded section.
Claims3
A super-resolution optical recording medium comprising a substrate and a recording layer formed on the substrate, wherein
- a recording mark, which has a size of a resolution limit or less of a reproduction optical system and can be reproduced by the reproduction optical system, is formed in the recording layer along a recording track, and at least the recording mark with the size of the resolution limit or less out of recording marks in a modulation code is a concave section with respect to a not-recorded section, and
- a ratio hm/ML between a height of the recording mark with respect to the not-recorded section in which a recording mark is not formed in the recording layer and a mark size ML is −0.20 hm/ML≦−0.01.
An optical recording method for forming a recording mark and a space, which each have a size of a resolution limit or less of a reproduction optical system and can be reproduced by the reproduction optical system, in a recording layer of a super-resolution optical recording medium having a substrate and at least the recording layer, a super resolution layer, and a light transmission layer, all of which are formed on the substrate, the method comprising:
- forming the recording mark with the size of the resolution limit or less and the space with the size of the resolution limit or less by adjusting an intensity of a laser for recording or an emission pattern of the laser for recording such that at least the recording mark with the size of the resolution limit or less out of recording marks in a modulation code is formed into a concave section with respect to a not-recorded section, and
- a ratio hm/ML between a height of the recording mark with respect to the not-recorded section in which a recording mark is not formed in the recording layer and a mark size ML is −0.20≦hm/ML≦−0.01.
Dependencies are inferred from the claim text.