The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 25, 2005
Filed:
Feb. 27, 2002
Hajime Yuzurihara, Odawara, JP;
Kazunori Ito, Yokohama, JP;
Nobuaki Onagi, Yokohama, JP;
Masaru Shinkai, Yokohama, JP;
Eiko Hibino, Yokohama, JP;
Hiroko Ohkura, Sagamihara, JP;
Makoto Harigaya, Hiratsuka, JP;
Hajime Yuzurihara, Odawara, JP;
Kazunori Ito, Yokohama, JP;
Nobuaki Onagi, Yokohama, JP;
Masaru Shinkai, Yokohama, JP;
Eiko Hibino, Yokohama, JP;
Hiroko Ohkura, Sagamihara, JP;
Makoto Harigaya, Hiratsuka, JP;
Ricoh Company, Ltd., Tokyo, JP;
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 ZrOand SiO, having a composition of (ZrO)(SiO), 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 SbTe metastable phase, the dielectric protective layer consists of a dielectric material containing ZrOas a major ingredient, and the reflective/heat dissipating layer consists of Ag, as a major ingredient.