Optical disk drive for scanning an optical disk with a...

Details Optical disk drive for scanning an optical disk with a... Optical disk drive for scanning an optical disk with a...

2008-06-18

2011-11-15

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S047390, C369S047550

Reexamination Certificate

active

08059501

ABSTRACT:
An optical disk drive and a method for scanning an optical disk that includes a substantially circular track with a scanning velocity is provided. A servo control signal (SCS) is determined based on a servo error signal (SES). A first performance indicator (IND1) of the servo actuator is determined from at least one of the SES and SCS. IND1is compared against a first pre-determined threshold (ITHR1), determining a first servo margin (MAR1). The scanning velocity is set in dependence on at least MAR1. In particular, scanning velocity is reduced when the first performance indicator exceeds the first pre-determined threshold. Additionally or alternatively, a bandwidth of control of the servo actuator can be adjusted in dependence on at least one of a second servo margin, determined from at least one of SES and SCS, and a third servo margin, associated with a mark quality determined from a central aperture signal.

REFERENCES:
patent: 2004/0004923 (2004-01-01), Hirai et al.
patent: 2006/0256684 (2006-11-01), Katayama

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