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:
Dec. 22, 2009
Filed:
Jul. 25, 2005
Nobuaki Sato, Yokohama, JP;
Hiroyuki Kunitake, Mito, JP;
Nobuaki Sato, Yokohama, JP;
Hiroyuki Kunitake, Mito, JP;
Hitachi-LG Data Storage, Inc., Tokyo, JP;
Abstract
An optical disc signal recording for forming a record mark according to a recording signal on an optical disc by applying a laser beam of a predetermined power level to the optical disc is provided. A recording pulse having a first period having a first level of Po and a width of Wh, a middle period having a second level of Pm lower than the first level Po and a width of Wm, and a last period having a level substantially equal to the first level Po and a width of Wt is generated and used for all record marks regardless of the lengths of the record marks. The record mark is formed using the generated pulse on the optical disc. As a result, setting of a write strategy is facilitated, an adjustment time in variable speed record mode is shortened, and a good recording characteristic is secured.