Method and apparatus for controlling track kick for optical disk

Details Method and apparatus for controlling track kick for optical disk Method and apparatus for controlling track kick for optical disk

1996-03-08

1998-05-26

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4437, G11B 7085

Patent

active

057577463

ABSTRACT:
A matrix circuit receives, as inputs, signals after opto-electrical conversion of reflected light of three light beams of the plus first, 0-th and minus first order light beams from the optical disk. Based on the signals, four tracking error signal are produced by the matrix circuit. Zero cross calculator detects zero cross points of the four tracking error signals, whereby movement of the beam spot formed of the light beams is monitored with points at 1/4, 2/4, 3/4 and 4/4 of a track pitch. Here, recording or reproduction is performed on both lands and grooves. The mute state of a tracking servo is released at a timing when the beam spot passes through a point at 2/4 of the track pitch and the polarity of the tracking servo is changed over at this timing.

REFERENCES:
patent: 5121375 (1992-06-01), Kuribayashi
patent: 5179545 (1993-01-01), Tanaka et al.
patent: 5218584 (1993-06-01), Gfeller
patent: 5615185 (1997-03-01), Horikiri
by Saito, A. et al., "1/8 Track Pitch Positioning Method for Optical Disk Drive", Central Research Laboratory, C-384, 1994, p. 62.
by Wakabayashi, K. et al., "High Density Optical Disk using Lattic Recording", Central Research Laboratory, C-507, 1994, pp. 5-74.
by Sugiyama, H. et al., "Proposal of 2-Dimensional Lattice Recording for High Density on Optical Disk", Central Research Laboratory, C-508, 1994, pp. 5-75.

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