Focus-balance calibration method

Details Focus-balance calibration method Focus-balance calibration method

2008-04-01

2008-04-01

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053280

Reexamination Certificate

active

10894625

ABSTRACT:
Absolute time in pre-groove (ATIP) signals or gain amplification signals corresponding to the ATIP signals for auto gain control (AGC) are used for focus-balance calibration of a blank optical disc. The ATIP signals are obtained in response to the movement of an optical pickup head to different positions. The ATIP signals or gain amplification signals are referred to locate an optimal position of the optical pickup head relative to the blank optical disc, therby accomplishing the focus-balance calibration.

REFERENCES:
patent: 5109367 (1992-04-01), Yoshikawa
patent: 5574706 (1996-11-01), Verboom et al.
patent: 6839310 (2005-01-01), Yoshida
patent: 6914862 (2005-07-01), Tsai et al.
patent: 6952382 (2005-10-01), Nishiuchi
patent: 2005/0254362 (2005-11-01), Araki

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