Optical disk recording apparatus and control method thereof

Details Optical disk recording apparatus and control method thereof Optical disk recording apparatus and control method thereof

2005-12-27

2005-12-27

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S047550, C369S116000

Reexamination Certificate

active

06980497

ABSTRACT:
An optical system of an optical disk recording apparatus irradiates a disk with a main beam for use in writing a data signal onto a disk and a sub-beam succeeding the main beam. When writing a data signal onto the disk, a site on the disk at which a data signal is written by the main beam is subsequently irradiated with the succeeding sub-beam. Light of the succeeding sub-beam reflected from the disk is received by a succeeding light receiving sub-region. A sampling circuit samples a signal at periods when the emission power of the main beam is at the recording level, among output signals from the succeeding light receiving sub-region. Based on the sampled signal at the recording level, a β value detection circuit and a jitter amount detection circuit obtain a β value and a jitter amount indicative of the recording state of the data signal recorded on the disk, respectively.

REFERENCES:
patent: 4670869 (1987-06-01), Chen
patent: 4980878 (1990-12-01), Szerlip
patent: 5043960 (1991-08-01), Nakao et al.
patent: 6577570 (2003-06-01), Lee et al.

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