Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2006-12-26
2006-12-26
Huber, Paul (Department: 2627)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S053270
Reexamination Certificate
active
07154826
ABSTRACT:
An information-recording method and an information-recording medium which make it possible to improve overwrite characteristics in the high speed recording, especially archival overwrite characteristics for overwriting information after retaining the medium in a high temperature environment for a certain period of time, and an information-recording apparatus based on the use of the same are provided. The information-recording method comprises overwriting a random pattern with light-beams having a predetermined recording power and a variety of erasing powers; reproducing the random pattern to determine a minimum value Pb1and a maximum value Pb2of the erasing power obtained when the pattern, in which a reproduction jitter exceeds a predetermined threshold value, is erased; determining an optimum erasing power Pb from the minimum value Pb1, the maximum value Pb2, and a relational expression represented by Pb=α×Pb1+(1−α)×Pb2; and recording the information with the determined optimum erasing power Pb. The value of α is previously recorded on the information-recording medium. The information-recording apparatus has a Pb-calculating control unit which reads the value of α when the optimum erasing power Pb is determined.
REFERENCES:
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Kitagaki Naoki
Miyamoto Makoto
Yamazaki Yuji
Hitachi Maxell Ltd.
Huber Paul
Oliff & Berridg,e PLC
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