Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-06-14
2005-06-14
Tran, Thang V. (Department: 2653)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044290, C369S044320
Reexamination Certificate
active
06906986
ABSTRACT:
A vibration quantity measuring apparatus and method, and a loop design method in which a vibration quantity generated in a focus and tracking loop is accurately measured to optimally design a focus and tracking loop of an optical disc drive. The vibration quantity measuring apparatus includes an error gain adjusting unit which adjusts an amplitude of a focus and tracking error which occurs where a disc rotates, so as to maintain the amplitude of the focus and tracking error constant, a loop gain adjusting unit which compares a closed loop phase of a focus and tracking loop and a predetermined reference closed loop phase, and maintains a constant gain of the focus and tracking loop to compensate for a gain difference of an actuator, and a measuring unit which calculates and outputs a vibration quantity using an error adjusted by the error gain adjusting unit and the loop gain adjusting unit, and an output of a controller which controls a focus and tracking of the disc. According to the methods and apparatus, a focus and tracking vibration quantity that occur differently depending on the type of a disc, on which data is recorded on or read from, or depending on a speed factor of a disc drive, can be measured.
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Go Sung-ro
Jun Hong-gul
Kim Won
Lee Dong-jin
Lee Moon-noh
Samsung Electronics Co,. Ltd
Staas & Halsey , LLP
Tran Thang V.
Vuong Bach
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