Information recording medium and manufacturing method thereof

Details Information recording medium and manufacturing method thereof Information recording medium and manufacturing method thereof

2006-01-03

2006-01-03

Mulvaney, Elizabeth (Department: 1774)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C428S064500, C430S270120, C430S270130

Reexamination Certificate

active

06982110

ABSTRACT:
An information recording medium includes a transparent substrate and a recording layer or a metal layer provided on the transparent substrate directly or via a ground layer. The information recording medium has a RAM area on which information is recorded, reproduced or erased, and a ROM area from which only reproduction is made, and an average thickness of the recording layer of said RAM area is larger than that of the recording layer or metal layer of the ROM area.

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