Optical master substrate and method to manufacture high-density relief structure
AssigneeKoninklijke Philips Electronics N.V.
InventorsErwin Meinders, Rolf Loch
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Abstract
The invention relates to a master substrate, a method for making a high density relief structure, and optical discs replicated with the high-density relief structure, the master substrate comprising a substrate layer (10) and a recording stack deposited o n the substrate layer, the recording stack comprising:—an information layer (12), an interface layer (11) sandwiched between said information layer and the substrate , forming marks and spaces representing an encoded data pattern, wherein said recording material is an alloy comprising at least two materials of the group of materials containing Ge, Sb, Te, In, Se, Hi, Ag, Ga, Sn, Pb, As. A very high-density relief structure is achieved.
Claims21
A master substrate comprising a substrate layer (10) and a recording stack deposited on the substrate layer, the recording stack comprising:
- an information layer (12),
- an interface layer (11) sandwiched between said information layer and the substrate,
- said information layer (12) comprising a growth-dominated phase-change material for forming marks and spaces representing an encoded data pattern, wherein said recording material is an alloy comprising at least two materials of the group of materials containing Ge, Sb, Te, In, Se, Bi, Ag, Ga, Sn, Pb, As.
A pre-recorded optical disc replicated with the stamper manufactured with the method of, characterized in that the relief structure on the stamper surface comprises shortest pits having a typical crescent and longer pits having a swallow-shaped trailing edge and that the relief structure is replicated in the optical disc.
Dependencies are inferred from the claim text.