Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-08-28
2007-08-28
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S053190
Reexamination Certificate
active
10914097
ABSTRACT:
A method for measuring a tilt angle of a pickup head. The method includes the steps of: moving the pickup head to a track to be measured; radiating a laser beam with a constant power; defining a proper range of tilt control values; controlling the tilt angle of the pickup head according to the range of tilt control values, acquiring a RF signal corresponding to each tilt control value, and storing an associated value of a associated signal; detecting the maximum among the stored associated values; selecting and storing the tilt control value corresponding to the maximum as the optimum tilt control value for the track if there is a maximum; and modifying the range of tilt control values and executing the previous steps if there is no maximum. The so-called associated signal includes a tracking error signal, a reading/writing RF signal, an S-curve signal, or the RF signal.
REFERENCES:
patent: 5001690 (1991-03-01), Kamiya et al.
patent: 6137754 (2000-10-01), Furukawa et al.
patent: 6442112 (2002-08-01), Tateishi
Ho Hsu-Feng
Kao Chih-Hsien
Ke Shih-Hao
Lin Jia-Hao
Hindi Nabil
Mediatek Inc.
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