Optical recording medium

Details Optical recording medium Optical recording medium

1998-04-24

2000-05-16

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428688, 428702, 428913, 43027011, 430945, 3692751, 369283, 369288, B32B 300

Patent

active

060634685

ABSTRACT:
An improved optical recording medium is provided, and includes a surface of the optical recording medium having at least pits and grooves formed therein, a recording layer formed adjacent the surface of said optical recording medium, and a light transmissive layer formed adjacent the recording layer. Information is recorded and/or reproduced by irradiation of light from an optical pickup employing an objective lens having a numerical aperture of 0.7 or larger through the light transmission layer. At least a surface layer of said light transmissive layer is formed of a material having a Young's modulus of 70 GPa or larger thereby greatly reducing or eliminating scratches from the surface of the optical recording medium while allowing for an increase in the storage capacity of the optical storage medium.

REFERENCES:
patent: 5474873 (1995-12-01), Akamatsu
patent: 5510164 (1996-04-01), Best
patent: 5654046 (1997-08-01), Ninomiya

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