Attenuation-amount adjusting circuit, optical disk drive...

Details Attenuation-amount adjusting circuit, optical disk drive... Attenuation-amount adjusting circuit, optical disk drive...

2011-05-03

2011-05-03

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

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

Control of information signal processing channel

C369S044130, C369S047220, C369S124120, C369S134000, C369S277000

Reexamination Certificate

active

07936650

ABSTRACT:
An attenuation-amount adjusting circuit includes: a light irradiating unit that alternately irradiates a laser beam of a writing level and a laser beam of a readout level on an optical disk that has a groove formed by a wobble pattern and plural markers indicating physical positions in the groove; a light receiving unit that receives reflected light of the laser beam irradiated on the optical disk and converts the reflected light into a reproduction signal; and a writing-waveform attenuating unit that attenuates an amplitude level of a writing waveform corresponding to the reflected light of the laser beam of the writing level in the reproduction signal according to a position from a rising edge of the writing waveform.

REFERENCES:
patent: 2002/0181357 (2002-12-01), Iimura
patent: 2006/0109770 (2006-05-01), Ogura et al.
patent: 2002-334446 (2002-11-01), None

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