| 摘要 |
When an irradiating laser power is demodulated by three values, that is a record power Pw, an erase power Pe and bias power Pb (Pw<Pe<Pb) to form a mask having a length nT (n: integer at least three, T: clock cycle), a laser is applied by being pulse-divided in a sequence of AtT, BtT, A1T, B1T,..., AmT, BmT, CT (m=(n-k)/2, k=3 (n:odd number) or k=4 (n: even number)) with the constant strength time of record power Pw being AtT, A1T,..., AmT and the constant strength time of bias power Pb being BtT, B 1T,..., BmT, CT (C=-1 to 3) (here, when At of n=3, 4, n>= 5 (odd number), n>= 6 (even number) is set as A t3, A t4, Atod, Atev, and Bt of n=3, 4, n>= 5 (odd number), n>= 6 (even number) is set as Bt3, Bt4,Btod,Btev, At3 + Bt3 = Atod + Btod = Am + Bm = 2T, A t4 + Bt4 = Atev + Btev = 3T). |
