Optical disk drive and optical disk having a continuous informat

Details Optical disk drive and optical disk having a continuous informat Optical disk drive and optical disk having a continuous informat

1997-03-19

1999-01-12

Hindi, Nabil

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 4426, 3692753, G11B 700

Patent

active

058598200

ABSTRACT:
In an optical disk device using an optical disk of a single land/groove spiral configuration, headers dividing each track revolution into sectors have one or more mirror surface parts, and the disposition and/or length of the mirror surface parts is different between sectors at a connecting point and sectors which are not at a connecting point. The device includes a circuit for detecting a connecting point based on the position and/or length of the mirror surface part. The device is further provided with a circuit for predicting the connecting point, thereby making up for any failure of detection by the detecting circuit. Such a predicting circuit may have a circuit for predicting the connecting point based on the phase of the disk motor when a connecting point is previously detected, or alternatively a circuit for predicting the connecting point by counting the number of PLL clocks, from a sector preceding the sector which is at a connecting point.

REFERENCES:
patent: 5270998 (1993-12-01), Uchiumi
patent: 5315578 (1994-05-01), Furakawa
patent: 5568459 (1996-10-01), Takamori et al.
patent: 5606543 (1997-02-01), Sugiyama
Ohtake, et al "Composite Wobble Tracking in the Optical Disk System," pp. 181-188 in Optical Memory Symposium '85, held on Dec. 12-13 in 1985, published by Optical Industry Technology Promotion Association.
Kaku, et al. on "Investigation of compensation method for track offset," pp. 209-214 in Optical Memory Symposium '85, held on Dec. 12-13 in 1985, published by Optical Industry Technology PRomotion Association.

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