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. 16, 2010
Filed:
Apr. 21, 2006
Jiro Yoshinari, Tokyo, JP;
Hideaki Miura, Tokyo, JP;
Hiroshi Shingai, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A method for recording information on an optical recording medium is provided so that it is satisfied that 0.16≦(L×T)/(λ/NA)≦0.30 and 0.06≦(L×T)/(λ/NA)≦0.14, where λ is a write wavelength of a laser beam used to irradiate the recording layer of a phase-change optical recording medium, NA is a numerical aperture of an objective lens used for irradiation with the laser beam, Lis a relative speed between the objective lens and the optical recording medium, Tis a pulse time of a cooling pulse inserted immediately following a leading write pulse, and Tis a leading write pulse time. The method allows for forming a record mark with a good shape and prevents fluctuations at the front edge of the record mark, which would be otherwise caused by the recrystallization of the recording film being held at a high temperature.