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US 9,672,861 B2Granted
Optical recording medium
AssigneeSony Corporation
InventorsKensaku Takahashi, Yo Ota, Hidehiro Kosaka
Life of this patent
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Abstract
There is provided an optical recording medium including: three reproduction layers, wherein reflectance R1, R2, and R3 of the three reproduction layers on a side of a surface irradiated with reproduction light is equal to or greater than 5%, and wherein any absolute value of a difference delta R between two selected from the reflectance R1, R2, and R3 is equal to or less than 7%.
Claims9
An optical recording medium comprising:
- three reproduction layers,
- wherein reflectance R1, R2, and R3 of the three reproduction layers on a side of a surface irradiated with reproduction light is equal to or greater than 5%,
- wherein any absolute value of a difference delta R between two selected from the reflectance R1, R2, and R3 is equal to or less than 7%;
- and
- wherein the three reproduction layers includes a first reproduction layer containing metal, a second reproduction layer containing metal, and a third reproduction layer containing metal oxide, and wherein the third reproduction layer is located at the closest position to the surface.
2 more elements
Dependencies are inferred from the claim text.