Title:
光学データ担体の傾きを補償する方法及び装置
Document Type and Number:
Japanese Patent JP2007508644
Kind Code:
A
Abstract:
The invention relates to a method of and a device for compensating tilt of an optical or magneto-optical disc ( 1 ) exhibiting unknown tilt when placed in an apparatus for reading and/or writing data from and/or onto the optical or magneto-optical disc. A holographic optical element ( 23 ) containing a plurality of holograms each defining a phase profile able to compensate at least a specific coma amount is placed in a light path of an optical read/write unit ( 4 ) of the apparatus. The amount of tilt of the disc or coma introduced by the tilt is detected ( 14, 21 ), and a hologram defining a phase profile corresponding to the detected amount of tilt or coma is selected and accessed among the plurality of holograms of the holographic optical element for compensating the detected amount of tilt or coma. The invention applies to any type of optical data carrier such as so-called LD, CD, R-CD, DVD, DVD+R, DVD+RW, DVD-RW, DVR (Blue Ray).
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Inventors:
Tuckel Teunis
Andersen I
Riedenbaum Cohen
Andersen I
Riedenbaum Cohen
Application Number:
JP2006530745A
Publication Date:
April 05, 2007
Filing Date:
October 01, 2004
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
G11B7/095; G11B7/135
Attorney, Agent or Firm:
Susumu Tsugaru
Akihiko Miyazaki
Fueda Shusen
Akihiko Miyazaki
Fueda Shusen