Optical recording process and optical recording system

Details Optical recording process and optical recording system Optical recording process and optical recording system

1997-06-05

1998-10-06

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

3692755, 3692752, 369283, 369288, 428 646, G11B 724, B32B 302

Patent

active

058188088

ABSTRACT:
An optical recording process for recording data on a recording medium of phase-change type employs laser power modulation scheme for mark-length modulation recording. The process selects one of pulse division schemes for modulating the laser power in accordance with a linear velocity on the disc. The recording laser includes m pulses for nT mark having a power level Pw and a duration of .alpha..sub.i T, with m intervals .beta..sub.i T sandwiched therebetween, wherein on condition that m=n-k and .SIGMA..alpha..sub.i +.SIGMA..beta..sub.i =n-j, .alpha..sub.i or bias power Pb.sub.i is changed in accordance with the linear velocity, Pb.sub.i being a bias power level for modulation, k and j being an integer and a real number, respectively, both selected between 0 and 2. A large range of the linear velocity margin can be obtained for the disc without changing either the composition of the phase-change material or multilayer structure on the disc.

REFERENCES:
patent: 5314734 (1994-05-01), Nishida et al.
patent: 5561656 (1996-10-01), Hust, Jr.
patent: 5581539 (1996-12-01), Horie et al.
patent: 5637372 (1997-06-01), Tominaga et al.
patent: 5688574 (1997-11-01), Tamura et al.

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