Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-12-22
1996-11-05
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369124, 369 4432, 369 4435, 2502015, G11B 700
Patent
active
055725015
ABSTRACT:
Disclosed is a focus servo circuit for an optical pickup actuator capable of performing a normal focusing operation accurately and fast with detecting predetermined regions of a focus error signal and focus servo drive signal. The circuit has a focus zero detection unit for generating a focus zero detection signal with a detection of a predetermined region including a zero crossing from the focus error signal, a drive signal zero detection unit for generating a focus servo drive zero detection signal with a detection of a predetermined region including a zero crossing from the focus error signal and a unit for controlling the focus start enable signal thereby to start a focus servo of the optical pickup actuator with reference to both of the focus zero detection signal and the focus servo drive zero detection signal.
REFERENCES:
patent: 4891798 (1990-01-01), Shinkai
patent: 5172354 (1992-12-01), Otsubo
patent: 5399849 (1995-03-01), Jung
patent: 5459309 (1995-10-01), Kagami et al.
Chu Kim-Kwok
Daewoo Electronics Co. Ltd.
Epps Georgia Y.
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