Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Reexamination Certificate
2005-01-25
2005-01-25
Angebranndt, Martin (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
C430S273100, C430S945000, C369S275500, C369S275200, C428S646000, C428S645000
Reexamination Certificate
active
06846611
ABSTRACT:
A phase-change optical recording medium capable of implementing record and readout operations of information data through reversible phase transition between amorphous and crystalline states induced by light beam irradiation in a recording layer included in the recording medium, including at least a transparent substrate and contiguous layers formed on the substrate in order as follows, a lower dielectric protective layer, the recording layer, an upper dielectric protective layer, and a reflective/heat dissipating layer, in which the upper dielectric protective layer essentially consists of a mixture of ZrO2and SiO2, having a composition of (ZrO2)100-x(SiO2)x, where 0<x<60 (mole %).The phase-change optical recording medium may alternatively include at least a reflective/heat dissipating layer provided contiguously to at least one surface of a recording layer, having a dielectric protective layer interposed between the reflective/heat dissipating layer and the recording layer, in which the recording layer essentially consists of a phase-change recording material having the Sb3Te metastable phase, the dielectric protective layer consists of a dielectric material containing ZrO2as a major ingredient, and the reflective/heat dissipating layer consists of Ag, as a major ingredient.
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Harigaya Makoto
Hibino Eiko
Ito Kazunori
Ohkura Hiroko
Onagi Nobuaki
Angebranndt Martin
Cooper & Dunham LLP
Ricoh & Company, Ltd.
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