Rotation control apparatus operating with a sync signal having v

Details Rotation control apparatus operating with a sync signal having v Rotation control apparatus operating with a sync signal having v

1997-03-12

1999-02-23

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 47, 369 48, G11B 700

Patent

active

058751637

ABSTRACT:
A rotation control apparatus which can maintain an accurate rotating state even in a high density optical disk (DVD) having a structure such that parts of the sync signal are recorded at an interval different from that of the other sync signal parts. The apparatus has: a unit period signal generator for generating a period signal of a unit period; a pre-pit detector for detecting a pre-pit from the DVD; a phase difference detector for detecting a phase difference between the detection timing of the pre-pit and the unit period signal; and holding circuit for a holding the phase difference detected. The rotation of the DVD is controlled on the basis of the phase difference held at the holding circuit.

REFERENCES:
patent: 4908810 (1990-03-01), Oie
patent: 5093820 (1992-03-01), Maeda et al.
patent: 5095475 (1992-03-01), Ishikawa
patent: 5420842 (1995-05-01), Shimizu
patent: 5432766 (1995-07-01), Ando et al.

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