Method for accurate positioning of marks and spaces on an...

Details Method for accurate positioning of marks and spaces on an... Method for accurate positioning of marks and spaces on an...

2003-06-30

2008-03-04

Nguyen, Hoa Thi (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S030210, C369S275300, C369S275400, C369S047530

Reexamination Certificate

active

07339871

ABSTRACT:
An optical disc has spatial features (notches, bumps, etc.) that intentionally distort the analog Read Data signal. For a mark or space that is centered on a spatial feature, the distortion does not affect the resulting binary Read Data signal. If an edge of a mark or space is near the spatial feature, the resulting binary Read Data signal is altered. For calibration, marks or spaces are written adjacent to spatial features, with a range of times for initiating the writes. The result is a range of write times that do not alter the binary Read Data signal. From these known times and spatial locations, it is known when a mark or space must be written to ensure accurate spatial placement.

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