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:
Feb. 27, 2007
Filed:
Jul. 22, 2004
Hiroyasu Inoue, Tokyo, JP;
Koji Mishima, Tokyo, JP;
Masaki Aoshima, Tokyo, JP;
Hideki Hirata, Tokyo, JP;
Hajime Utsunomiya, Tokyo, JP;
Hiroyasu Inoue, Tokyo, JP;
Koji Mishima, Tokyo, JP;
Masaki Aoshima, Tokyo, JP;
Hideki Hirata, Tokyo, JP;
Hajime Utsunomiya, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An optical information recording medium which makes it possible to reduce the noise level and improve the C/N ratio. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproducing record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as a main component. The second sub-recording film is formed of a second material containing Zn as a main component and having Al added thereto, and disposed in the vicinity of the first recording film. The laser beam is irradiated to the recording layer via a light transmitting layer formed in a manner covering the recording layer.