Servo control signal generation device and an optical disk...

Details Servo control signal generation device and an optical disk... Servo control signal generation device and an optical disk...

2006-07-20

2010-02-16

Dinh, Tan X (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044250, C369S044270, C369S053200, C369S053410

Reexamination Certificate

active

07663986

ABSTRACT:
A servo control signal generation device for discriminating a kind of an optical disk, changing over between top and bottom envelope signals of an RF signal, and generating a defect signal and a mirror signal includes an RF generator for generating the RF signal from reflected light of an optical disk, a disk discriminator for discriminating a kind of the optical disk from the RF signal, and a top envelope generator and a bottom envelope generator respectively for generating the top and bottom envelope signals of the RF signal. If the disk has reflectance after recording which is lower than that before recording, the defect and mirror signals are generated respectively from the top and bottom envelope signals. If the disk has reflectance after recording which is higher than that before recording, the defect and mirror signals are generated respectively from the bottom and top envelope signals.

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patent: 2003/0152000 (2003-08-01), Yamanoi et al.
patent: 2005/0128917 (2005-06-01), Ogawa et al.
patent: 02-005238 (1990-01-01), None
patent: 2512087 (1996-04-01), None
patent: 10-21547 (1998-01-01), None
patent: 2003-242658 (2003-08-01), None

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