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Title:
2波長レーザダイオード使用のための光検出器
Document Type and Number:
Japanese Patent JP4219363
Kind Code:
B2
Abstract:
A photodetector detecting reflected light components from an optical medium, the photodetector including a first detector divided into eight sections detecting the reflected light components and converting the light components into electrical signals, a first calculating portion calculating a first tracking error signal from the electrical signals by a differential push-pull method, a second calculating portion calculating a first focusing error signal by an astigmatism method and calculating a second tracking error signal by a differential phase detection method from the electrical signals converted by the first detector; a second detector divided into four sections detecting the reflected light components reflected by the optical recording medium to convert the light components into electrical signals; and a third calculating portion calculating a second focusing error signal by the astigmatism method and calculating a third tracking error signal by the differential phase detection method from the electrical signals converted by the second detector.

Inventors:
Park, Soo Han
Kim, John-Wook
Application Number:
JP2005509069A
Publication Date:
February 04, 2009
Filing Date:
October 17, 2003
Export Citation:
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Assignee:
Samsung Electronics Company Limited
International Classes:
G11B7/09; G11B7/12; G11B7/13; G11B7/00; G11B7/125
Domestic Patent References:
JP2001222825A
JP2002245660A
JP2001236652A
JP2002216372A
JP2003099951A
JP2000149298A
JP3463003B2
JP10261240A
JP11134675A
JP2001256657A
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito