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. 25, 2008
Filed:
Aug. 26, 2004
Shinya Narumi, Yokohama, JP;
Katsuyuki Yamada, Zama, JP;
Masaki Kato, Sagamihara, JP;
Hajime Yuzurihara, Odawara, JP;
Hiroshi Deguchi, Yokohama, JP;
Shinya Narumi, Yokohama, JP;
Katsuyuki Yamada, Zama, JP;
Masaki Kato, Sagamihara, JP;
Hajime Yuzurihara, Odawara, JP;
Hiroshi Deguchi, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An information recording method including irradiating an optical information recording medium containing a phase change recording layer on a substrate having a guide groove with continuous light of a laser beam having an erase power level Pe to determine a transition linear velocity Vo defined as a minimum linear velocity above which the following relationship is satisfied: Rr=Ra/Rb<1, wherein Rr represents a reflection light intensity ratio, and Ra and Rb represent a reflection light intensity measured after and before the irradiation of the optical information recording medium with the continuous light, respectively, prior to recording information in the optical information recording medium.