Title:
フィルタリングプッシュプルの半径方向のトラッキングによる光学システム
Document Type and Number:
Japanese Patent JP2008542975
Kind Code:
A
Abstract:
The present invention relates to optical system capable of reproducing information from an optical carrier by a main beam (C) for reading information as readable effects on the carrier, and a first (A) and a second (B) auxiliary beam. The optical system is adapted to direct the main beam (C) and the first (A) and second (B) auxiliary beam onto the carrier so that the main beam is positioned on a first track, and the first and second auxiliary beam are oppositely positioned on a second and a third track. The optical system can adjust a push pull (PP) radial error signal from the main beam by a function; f=f(A, B, C), where the function f is dependent upon adjacently positioned readable effects in the first, second and third track i.e. the local optical environment of the main beam. Therefore a filtering or "cleaning" of the push pull signal is performed depending on the local optical environment of the main beam.
Inventors:
Fluterus root
Dog, binu
Dog, binu
Application Number:
JP2008515347A
Publication Date:
November 27, 2008
Filing Date:
June 02, 2006
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
G11B7/09
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito
Shinsuke Onuki
Tadashige Ito