Focus layer jump control circuits and methods of controlling...

Details Focus layer jump control circuits and methods of controlling... Focus layer jump control circuits and methods of controlling...

2007-01-19

2010-02-09

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S094000

Reexamination Certificate

active

07660213

ABSTRACT:
A focus layer jump control circuit may include a signal processing block that converts an analog focus error (FE) signal into a digital FE signal, in response to the analog FE signal and a FE selection signal; a layer jump control block that outputs a second control signal, in response to the digital FE signal and a reference clock signal; a focus main filter block that outputs first and second compensation signals that amplify the digital FE signal and that compensate for a phase of the digital FE signal, in response to an internal selection signal; an exponent signal generator that generates an exponent signal, in response to a focus layer jump indicating signal and a first control signal; and an output circuit that outputs a first-order difference signal using the exponent signal, the first compensation signal, and the second compensation signal, in response to the second control signal.

REFERENCES:
patent: 6298020 (2001-10-01), Kumagami
patent: 2001/0055254 (2001-12-01), Kishimoto et al.
patent: 2004/0141429 (2004-07-01), Kishimoto et al.
patent: 2005/0237889 (2005-10-01), Shioura et al.
patent: 04-060974 (1992-02-01), None
patent: 06-119644 (1994-04-01), None
patent: 08-063915 (1996-03-01), None
patent: 09-120549 (1997-05-01), None

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