Optical data recording medium with protrusion bonded between...

Dynamic optical information storage or retrieval – Optical storage medium structure – Disk protection

Reexamination Certificate

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Reexamination Certificate

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11902733

ABSTRACT:
A disc-shaped optical data recording medium has a signal recording layer for reading and/or writing data using light, and a 10 μm to 200 μm thick transparent protective layer disposed over the signal recording layer. The optical data recording medium includes a protrusion projecting from a surface of the transparent protective layer on a light-incidence surface side to which light is emitted to the signal recording layer. The protrusion is disposed in an area between a center hole and a clamping area where the optical data recording medium is held when reading and/or writing data in the signal recording layer.

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