Title:
OPTICAL PICKUP AND MULTILAYER OPTICAL DISK
Document Type and Number:
Japanese Patent JP2009054224
Kind Code:
A
Abstract:
To provide an optical pickup for performing highly reliable recording and reproduction without receiving the influence of interlayer crosstalk in a multilayer optical disk having a plurality of information recording layers, and to provide an optical disk medium.
In the optical pickup compatible with tracking control by a DPP (Differential Push-Pull) system, a variation of a sub push-pull signal upon recording and reproduction to/from a multilayer disk medium having two or more information layers is limited to a prescribed range. RF signal variation is limited to a prescribed range in a multilayer disk having three or more information recording layers.
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Inventors:
KUROKAWA TAKAHIRO
SHIOZAWA MANABU
MIYAMOTO JIICHI
SHIOZAWA MANABU
MIYAMOTO JIICHI
Application Number:
JP2007219187A
Publication Date:
March 12, 2009
Filing Date:
August 27, 2007
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G11B7/135; G11B7/24
Attorney, Agent or Firm:
Manabu Inoue
Yuji Toda
Yuji Toda