Stock material or miscellaneous articles – Circular sheet or circular blank
Reexamination Certificate
2008-04-29
2008-04-29
Mulvaney, Elizabeth (Department: 1794)
Stock material or miscellaneous articles
Circular sheet or circular blank
C428S064400, C430S270120
Reexamination Certificate
active
11410791
ABSTRACT:
An optical recording medium including a recording layer which includes a reversible phase-change recording material, the recording layer being capable of writing information therein, reading written information therefrom, and rewriting written information by utilizing the reversible phase change of the phase-change recording material, wherein when a recording mark formed in the recording layer is repeatedly read 5000 times, using a continuous wave laser beam having such an intensity Pr that satisfies the condition of 1.1≦R≦2.0, in which R is σrepeat/σ1as defined in the specification, the optical recording medium satisfies a relationship of d1>dowas defined in the specification. The phase-change recording material, a method of producing the optical recording medium, and a method of writing information in the optical recording medium, reading written information therefrom and rewriting written information therein are proposed.
REFERENCES:
patent: 5254382 (1993-10-01), Ueno
patent: 6115352 (2000-09-01), Ohno
patent: 6416837 (2002-07-01), Kojima
patent: WO 99/44199 (1999-09-01), None
Harigaya Makoto
Hibino Eiko
Ito Kazunori
Iwata Noriyuki
Ohkura Hiroko
Cooper & Dunham LLP
Mulvaney Elizabeth
Ricoh & Company, Ltd.
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