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:
Mar. 21, 2006
Filed:
May. 18, 2004
Yoshitaka Sakaue, Hirakata, JP;
Ken'ichi Nagata, Nishinomiya, JP;
Noboru Yamada, Hirakata, JP;
Rie Kojima, Kadoma, JP;
Takashi Nishihara, Hirakata, JP;
Yoshitaka Sakaue, Hirakata, JP;
Ken'ichi Nagata, Nishinomiya, JP;
Noboru Yamada, Hirakata, JP;
Rie Kojima, Kadoma, JP;
Takashi Nishihara, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An optical information recording medium of the invention has at least two information layers. A first information layer () disposed at the front side (viewed from a laser incident side) includes at least a reflection layer (), a recording layer () disposed at the laser incident side with respect to the reflection layer (), for generating a reversible change between an amorphous phase and a crystalline phase that can be detected optically by applying a laser beam, and a dielectric layer () disposed between the reflection layer () and the recording layer (). The dielectric layer () contains at least Zr, Si and Cr, a ratio of Zr, Si and Cr of the dielectric layer () at the reflection layer side is expressed as Zr:Si:Cr=p:q:r (p+q+r=100), a ratio of Zr, Si and Cr of the dielectric layer () in the vicinity of the interface at the recording layer side is expressed as Zr:Si:Cr=s:t:u (s+t+u=100), and r<u or t<q.