Title:
LASER POWER CONTROL METHOD AND LASER POWER CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/152029
Kind Code:
A1
Abstract:
As it becomes possible to produce a larger capacity and high-speed recordable optical disc, the recording signal has a higher frequency and a shorter pulse width. There is a drawback that when a laser is driven by a signal having a short pulse width and the rising time and the decaying time of an optical pulse become longer, the high speed recording to the optical disc becomes difficult. Therefore, when user data is recorded, a bottom drive current is set to a second bottom drive current value which is a current value equal to or less than a threshold value, so that the rising time and the decaying time of the optical pulse can be shorter, and the high speed recording to the optical disc can be performed.
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Inventors:
FUJIUNE, Kenji (())
藤畝 健司 (())
藤畝 健司 (())
Application Number:
JP2011/003024
Publication Date:
December 08, 2011
Filing Date:
May 31, 2011
Export Citation:
Assignee:
PANASONIC CORPORATION (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 〒5718501, JP)
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
FUJIUNE, Kenji (())
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
FUJIUNE, Kenji (())
International Classes:
G11B7/125; G11B7/0045
Attorney, Agent or Firm:
NAITO, Hiroki et al. (1006 Oaza Kadoma, Kadoma-sh, Osaka 01, 〒5718501, JP)
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Claims: