Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-08-02
2005-08-02
Huber, Paul W. (Department: 2653)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S053280
Reexamination Certificate
active
06925038
ABSTRACT:
The present invention provides an optical disc apparatus which solves a problem that the tracking control takes off when an objective lens is displaced in the tracking direction due to its weight. In this optical disc apparatus, a spot position detector108generates a spot position signal which indicates a position of a light spot on a light receiving element105, and supplies the signal to a traverse loop filter111and a spot position loop filter109. A controller115supplies an output from the spot position loop filter109to a tracking actuator104, before supplying an output from the traverse loop filter111to a traverse motor113, previously moves the light spot near the center of the light receiving element105, and starts the traverse control in a state where a value of the spot position signal at starting of the traverse control is reduced.
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Kouno Kazuhiko
Matsubara Akira
Soma Yasuhito
Huber Paul W.
Matsushita Electric - Industrial Co., Ltd.
Parkhurst & Wendel L.L.P.
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