Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2011-04-26
2011-04-26
Young, Wayne R (Department: 2627)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S272100, C369S047530, C369S053200, C369S053220, C369S053260, C369S053270, C369S116000
Reexamination Certificate
active
07933179
ABSTRACT:
In a super-resolution optical disk for the purpose of achieving an increase in the density of recording data by reproducing a recording mark smaller than optical resolution, the optimum reproduction power needs to be determined since the quality of a super-resolution reproduced signal strongly depends on the reproduction laser power. However, since the track error signal required for tracking servo also depends on the reproduction power, there is a need for a method for determining the reproduction power taking into account both the stabilization of tracking servo and a quality improvement of the reproduction signal. The reproduction power is changed under conditions with focusing servo applied but without application of tracking servo. Thereby, a cross track signal is detected to identify a reproduction power region that leads to quality improvement of both a reproduction signal and a track error signal.
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Eto Soichiro
Minemura Hiroyuki
Shintani Toshimichi
Antonelli, Terry Stout & Kraus, LLP.
Bernardi Brenda
Hitachi , Ltd.
Young Wayne R
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