Optical data recording disc with protrusion between clamping...

Details Optical data recording disc with protrusion between clamping... Optical data recording disc with protrusion between clamping...

2007-09-12

2008-08-05

Watko, Julie Anne (Department: 2627)

Dynamic optical information storage or retrieval

Optical storage medium structure

Disk protection

Reexamination Certificate

active

07409699

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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