Title:
光ピックアップのトラッキング制御装置、及び光ピックアップのトラッキング制御方法
Document Type and Number:
Japanese Patent JP4001431
Kind Code:
B2
Abstract:
In a tracking controller for an optical pickup, a photodetector having four light reception parts receives return light from an optical disc and outputs light detection electric signals. Predetermined addition and subtraction operations are performed on the light detection electric signals from the light reception parts. A phase comparator compares phases and outputs a pseudo radial contrast signal. Bringing into tracking servo control is performed based on the pseudo radial contrast signal.
Inventors:
Kiyoshi Tateishi
Application Number:
JP7881099A
Publication Date:
October 31, 2007
Filing Date:
March 24, 1999
Export Citation:
Assignee:
Pioneer Corporation
International Classes:
G11B7/085; G11B21/10; G11B7/09
Domestic Patent References:
| JP3144923A |
Attorney, Agent or Firm:
Yasuo Ishikawa