Optical recording medium

Details Optical recording medium Optical recording medium

2011-07-12

2011-07-12

Mulvaney, Elizabeth (Department: 1785)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C430S270100

Reexamination Certificate

active

07976922

ABSTRACT:
An optical recording medium including a substrate, an information recording layer including a recording layer and a cover layer, wherein information is written and read on the information recording layer by irradiation of laser beam via the cover layer, the cover layer includes an ultraviolet curing resin and an inner hardness Hi defined as hardness H of the cover layer on a side of the information recording layer satisfies the following relationship: 3.8≦Hi≦5.5, when H=3.8584×F/(h×h), wherein h represents an indented depth in a state in which a triangular pyramid indenter with a tip angle of 115° is pressed under F=9.8 mN.

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