Optical recording medium
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsKazunari Taki, Hideo Maruyama, Yumiko Ohashi, Riki Matsuda
Life of this patent
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Abstract
An optical recording disk comprises a base plate, a flat layer, an optical recording layer and a protection layer which are laminated in this order. The flat layer has a flat surface which contacts with the optical recording layer to thereby enable the optical recording layer to have a uniform thickness over the layer and make the surface of the optical recording layer flat. At least one of the other layers constituting the above optical disk other than the optical recording layer comprises a material capable of recording and reproducing information, such as a magnetooptic material, a phase-change material, an organic pigment and a pit-formable material in which the information is recordable.
Claims48
An optical recording medium for recording information therein and reproducing the information therefrom with irradiation of light thereto, comprising:
- a base plate;
- a tracking guide member formed on a surface of said base plate and having an uneven surface for generating a tracking signal;
- a flat layer covering said uneven surface of said tracking guide member and having a substantially flat surface at the opposite side to said base plate for smoothing said uneven surface on said base plate;
- and
- a recording layer formed on said flat layer and having a substantially uniform thickness and a substantially flat surface.
An optical recording medium for recording information therein and reproducing the information therefrom with irradiation of light thereto, comprising:
- a base plate having a substantially flat surface;
- a recording layer formed on said base plate and having a substantially uniform thickness and a substantially flat surface;
- and
- a light absorption layer formed on said recording layer and comprising projections for absorbing the irradiated light therein and grooves for passing the irradiated light therethrough, said projections and said grooves defining tracks for recording the information.
An optical recording medium for recording information therein and reproducing the information therefrom with irradiation of light, comprising:
- a base plate;
- a tracking guide layer formed on a surface of said base plate and having an uneven surface for generating a tracking signal;
- a flat layer covering said uneven surface of said tracking guide layer and having a substantially uniform thickness and a substantially flat surface at the opposite side to said base plate;
- a first recording layer formed on said flat layer and having a substantially uniform thickness and a substantially flat surface;
- a first protection layer formed on said recording layer for protecting said recording layer from chemical change;
- one of a reflection layer and a light absorption layer formed on said protection layer;
- a second recording layer formed on said one of a reflection layer and a light absorption layer;
- a light absorption layer having thereon projections for absorbing the irradiated light and grooves which pass the irradiated light therethrough for defining tracks for recording the information;
- and
- a transparent protection layer formed on said light absorption layer.
An optical recording medium for recording information therein and reproducing the information therefrom with irradiation of light thereto, comprising:
- a base plate having a substantially flat surface;
- first and second recording layers formed on both surfaces of said base layer, each having a substantially uniform thickness and a substantially flat surface;
- first and second light absorption layers formed on said recording layers respectively, each comprising projections for absorbing the irradiated light therein and grooves for passing the irradiated light therethrough, said projections and said grooves defining tracks for recording the information;
- and
- first and second transparent protection layers formed on said first and second light absorption layers respectively.
Dependencies are inferred from the claim text.