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AssigneeKoninklijke Philips N.V.
InventorsHubert Cécile François MARTENS, Ronald Joseph Antonius VAN DEN OETELAAR
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A multi-stack optical data storage medium for recording and reading using a focused radiation beam entering through an entrance face of the medium has a first substrate with a first guide groove having a depth GL0<80 nm and a full half maximum width WL0<350 nm, where a first recording stack is formed over the first substrate and includes a recordable type recording layer formed in the first guide groove. A first reflective layer is present between the first recording layer and the first substrate. A second recording stack has a recordable type recording layer formed a second guide groove of a second substrate, where the second recording stack is present at a position closer to the entrance face than the first recording stack. A transparent spacer layer is sandwiched between the first and second recording stacks. The first L0 guide groove has a depth GL0<100 nm.
A multi-stack optical data storage medium with two recording stacks separated by a transparent spacer layer for recording and reading using a focused radiation beam entering through an entrance face of the medium during recording and reading, comprising:
A multi-stack optical data storage medium for recording and reading using a focused radiation beam entering through an entrance face of the medium during recording and reading, comprising:
A multi-stack optical data storage medium for recording and reading using a focused radiation beam having a wavelength of 655 nm entering through an entrance face of the medium during recording and reading, comprising:
Dependencies are inferred from the claim text.