RADIAL CONTROL METHOD FOR A DEVICE FOR REPRODUCING INFORMATION OF AN OPTICAL DISK, AND REPRODUCTION DEVICE FOR CARRYING OUT SAID METHOD

Title:

RADIAL CONTROL METHOD FOR A DEVICE FOR REPRODUCING INFORMATION OF AN OPTICAL DISK, AND REPRODUCTION DEVICE FOR CARRYING OUT SAID METHOD

Document Type and Number:

WIPO Patent Application WO2003083844

Kind Code:

A3

Abstract:

The invention relates to a radial control method and a reproduction device for carrying out said method in terms of optical disks. According to the invention, in an optical head of a standard reproduction device using a four-quadrant detector having four photodiodes which are distributed on both sides of a direction parallel to the axis of the track, the individual signals of the photodiodes (d1 to d4) are combined in order to residually (21, 22) form reading signals according to the two diagonals (diag1, diag2,). A phase comparison circuit (100) enables a radial error signal (Sr) to be generated by measuring the phase shift of the reading signals of the diagonals. The invention especially relates to phase disks with weakly phase shifting marks.

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Inventors:

COLINEAU JOSEPH (FR)
LEHUREAU JEAN-CLAUDE (FR)

Application Number:

PCT/FR2003/000942

Publication Date:

April 01, 2004

Filing Date:

March 25, 2003

Export Citation:

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Assignee:

THALES SA (FR)
COLINEAU JOSEPH (FR)
LEHUREAU JEAN-CLAUDE (FR)

International Classes:

G11B7/003; G11B7/0037; G11B7/09; G11B7/095; (IPC1-7): G11B7/09

Foreign References:

FR2805382A1	2001-08-24
US4785441A	1988-11-15

Other References: