Title:
【発明の名称】光ディスク記録再生装置
Document Type and Number:
Japanese Patent JP2860229
Kind Code:
B2
Abstract:
Data is recorded at a double density on a CLV disk. Sub-spots are shifted by a half track pitch from a main spot. A push-pull signal obtained from the main spot is used as a tracking signal. The polarity of the push-pull signal is changed to perform the tracking control at the groove center or at the land center. While the main spot is controlled to be at the groove center, address information is read from the push-pull signal of the main spot. While the main spot is controlled to be at the land center, address information is read from the push-pull signal of a sub-spot.
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Inventors:
HORIKIRI KENICHI
Application Number:
JP17978093A
Publication Date:
February 24, 1999
Filing Date:
June 25, 1993
Export Citation:
Assignee:
KENUTSUDO KK
International Classes:
G11B7/00; G11B7/0045; G11B7/005; G11B7/007; G11B7/09; G11B7/095; G11B7/24079; G11B7/24082; G11B7/24085; G11B7/24097; G11B27/10; G11B27/19; G11B11/105; (IPC1-7): G11B7/00; G11B7/095; G11B27/10
Attorney, Agent or Firm:
Masao Shibata