Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Reexamination Certificate
2006-05-11
2009-06-09
Young, Wayne R (Department: 2627)
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
C369S030170, C369S044280
Reexamination Certificate
active
07545707
ABSTRACT:
The present invention relates to optical disc drives including a carriage which is movable radially of an optical disc and an objective lens which is supported on the carriage movably in radial directions of the disc for formation and placement of a beam spot on the disc. The invention aims at reducing minute vibration of the objective lens during a seek control stably and reliably. According to the present invention, the minute vibration of an objective lens (104) is reduced by moving the objective lens (104) at a relative speed of zero with respect to a carriage (101) during the seek operation, based on a TZC signal which indicates that the beam spot has crossed over a track in an optical disc (2). In this control, a position of the objective lens (104) in the carriage (101) right before starting the seek operation is detected and stored in a memory (802). Then, a position of the objective lens (53) in the carriage (101) is detected during the seek operation. If an error between this position and the position stored in the memory (802) exceeds a predetermined threshold value, the position of the objective lens (104) in the carriage (101) is corrected to the position stored in the memory (802).
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Chow Van N
Fujitsu Limited
Greer Burns & Crain Ltd.
Young Wayne R
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