Optical information recording medium, reproducing method thereof, and manufacturing method thereof
AssigneeHitachi, Ltd.
InventorsToshimichi Shintani, Harukazu Miyamoto, Yumiko Anzai, Hiromi Kudo
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Abstract
Super-resolution technology was proposed for generating marks smaller than the optical resolution in order to record data at high density on the optical disk. However, the achievable high density of the super-resolution technology was limited due to fluctuation of the region exhibiting the super-resolution effect due to the grain size or the molecular size comprising the super-resolution film. However fluctuation in the region exhibiting the super-resolution effect is reduced by utilizing recording marks possessing their own super-resolution effect and also by separating the recording marks from each other.
Claims11
An optical information recording medium that reproduces information by an irradiation of a beam spot having a predetermined size, comprising:
- a substrate;
- and
- a recording film formed directly or via a protective film on the substrate,
- said recording film further comprising:
- a plurality of recording pits in which a super resolution material is filled, wherein each said recording pit comprises a recording mark;
- and
- a thermal insulator to separate said plurality of recording pits from each other, said thermal insulator being comprised of a material with a heat conductivity lower than heat conductivity of the super resolution material,
- wherein an area of each of said recording pits is smaller than that of said beam spot,
- wherein said thermal insulator surrounds said recording pits to isolate the recording pits from one another, and
- wherein said plurality of recording pits and said thermal insulator are formed in a same layer of said recording film.
An information reproducing method comprising:
- using an optical information recording medium including a recording layer that includes recording pits filled with a super resolution material and a heat blocking thermal insulator for separating said recording pits from each other, wherein the thermal insulator is comprised of a material with heat conductivity lower than the heat conductivity of the super resolution material;
- irradiating the optical information recording medium with light having a spot size larger than an area of each of the recording pits;
- melting a part of recording pits being included in an area irradiated by the light;
- and
- reading out information by detecting signals from the melted recording pits,
- wherein said thermal insulator surrounds said recording pits to isolate the recording pits from one another, and
- wherein said plurality of recording pits and said thermal insulator are formed in a same layer of said recording film.
Dependencies are inferred from the claim text.