Dynamic information storage or retrieval – Binary pulse train information signal – Including sampling or a/d converting
Reexamination Certificate
2006-05-09
2006-05-09
Patel, Gautam R. (Department: 2655)
Dynamic information storage or retrieval
Binary pulse train information signal
Including sampling or a/d converting
C369S059110, C369S124020
Reexamination Certificate
active
07042824
ABSTRACT:
An optical multi-level recording medium, having a recording layer on which a recording mark is formed by irradiating a laser beam, plural virtual recording cells being continuosly formed in a relative moving direction to the laser beam on the recording layer with an arbitrary unit length and a unit width, five stages or more irradiation times being set so that the irradiation time becomes long successively from the first to final stages, a power average value of laser beam in a specific irradiation time of the plural-stage irradiation times being set so as to become larger than a power average value of another irradiation time longer than the specific irradiation time, and recording marks being formed in the virtual recording cell and giving five stages or more different optical reflectance when the laser beam is irradiated to the virtual recording cell.
REFERENCES:
patent: 6370097 (2002-04-01), Hayashi et al.
patent: 6611484 (2003-08-01), Tsukamoto
patent: 1235210 (2002-08-01), None
patent: 2001184648 (2001-07-01), None
Oliff & Berridg,e PLC
Patel Gautam R.
TDK Corporation
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