Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal processing for controlling recording light...
Reexamination Certificate
2006-05-23
2006-05-23
Edun, Muhammad (Department: 2655)
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal processing for controlling recording light...
C369S059120, C369S059200, C369S116000
Reexamination Certificate
active
07050377
ABSTRACT:
An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps of:when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2),(i) dividing the time length of the recording mark nT intoin-line-formulae description="In-line Formulae" end="lead"?η1T, α1T, β1T, α2T, β2T, . . . , α1T, β1T, αmT, βmT, η2Tin-line-formulae description="In-line Formulae" end="tail"?in that order (m is a pulse division number; Σi(αi+βi)+η1+η2=n; αi(1≦i≦m) is a real number>0; βi(1≦i≦m−1) is a real number>0; βmis a real number≧0; and η1is a real number of −2≦η1≦2 and η2is a real number of −2≦η2≦2);radiating recording light with a recording power Pwiin a time duration of αiT (1≦i≦m), and radiating recording light with a bias power Pbiin a time duration of βiT (1≦i≦m), the bias power being Pbi<Pwiand Pbi<Pwi+1; and(ii) changing m, αi, βi, η1, η2, Pwiand Pbiaccording to n of the time length nT of the recording mark;wherein the pulse division number m is 2 or more for the time duration of at least one recording mark and meets n/m≧1.25 for the time length of all the recording marks.
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Horie Michikazu
Nobukuni Natsuko
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