Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-05-08
1999-06-08
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 4432, G11B 700
Patent
active
059109360
ABSTRACT:
Apparatus for measuring warp of an optical disk is disclosed. The apparatus includes an actuator having a base and a moveable lens holder, the lens holder being moveable in a vertical direction relative to the base. The apparatus further includes a structure for moving the actuator to selected positions relative to the surface of the disk and for measuring the vertical displacement of the disk surface relative to the actuator base at each of the selected positions, a structure for providing displacement signals corresponding to the vertical displacement of the disk surface at each of the selected positions, and a structure responsive to the displacement signals for computing a radial tilt matrix and a tangential tilt matrix of optical disk surface tilt values, the matrices representing the warp of the surface of the disk.
REFERENCES:
patent: 5182739 (1993-01-01), Kime et al.
patent: 5483512 (1996-01-01), Yanagawa
patent: 5732054 (1998-03-01), Marino et al.
patent: 5737288 (1998-04-01), Marino et al.
patent: 5740139 (1998-04-01), Marino et al.
Crocker Pamela R.
Eastman Kodak Company
Tran Thang V.
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