Patents Examined by Christopher Ray Lamb
  • Patent number: 7636283
    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.
    Type: Grant
    Filed: July 25, 2005
    Date of Patent: December 22, 2009
    Assignee: Hitachi-LG Data Storage, Inc.
    Inventors: Nobuaki Sato, Hiroyuki Kunitake