Phase-change type optical recording and reproducing method

Details Phase-change type optical recording and reproducing method Phase-change type optical recording and reproducing method

1997-01-29

1998-04-14

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, G11B 700

Patent

active

057401497

ABSTRACT:
When recording data according to the PWM recording system by modulating signals, pulse modulation for pulse modulation for recording for recording a 0 signal or the like having a signal width of nT (T: Clock time) after modulation is a continuous electro-magnetic wave at a power level e, a record signal pulse array for recording a 1 signal or the like having a signal width of nT after modulation comprises a pulse section fp having a time width x and a power level a, a multi-pulse section mp in which a low level pulse at a power level b and a high power pulse at a power level c having a time width T in total alternately appear (n-n') times in all with a duty ratio y, and a pulse section op having a time width z and a power level d, and x, y, z are integers satisfying the conditions of 0.5T .ltoreq.x.ltoreq.2T, 0.4.ltoreq.y.ltoreq.0.6 and 0.5T.ltoreq.z.ltoreq.1T, and n' is a positive integer which is equal to or smaller than n, and controls are provided so that the condition of (a and c)>e>(b and d) is satisfied.

REFERENCES:
patent: 5150351 (1992-09-01), Ohne et al.
patent: 5471457 (1995-11-01), Bakx et al.
patent: 5475666 (1995-12-01), Ito et al.
patent: 5513165 (1996-04-01), Ide et al.
patent: 5608710 (1997-03-01), Minemura et al.
patent: 5629913 (1997-05-01), Kaku et al.
patent: 5642343 (1997-06-01), Toda et al.
Kenichi Nishiuchi et al., Feasibility Study of Ge-Sb-Te Phase-Change Optical Disk Medium for One-Pass Overwrite Digital Audio Recording, Feb. 31, 1992, pp. 653-658.
Hiroko Iwasaki et al. "Completely Erasable Phase Change Optical Disc II Application of Ag-In-Sb-Te Mixed Phase System For Rewritable Compact Disc Compatible with CD-Velocity and Double CD-Velocity." Jpn J. Appl. Phys. vol. 32 Nov. 1993, pp.5241-5247 part 1 No. 11B.
Tokuhiko Handa et al. "In-Ag-Te-Sb Phase Change Recording Media at Compact Disk Linear Velocity." Jpn J. Appl. Phys. vol. 32 (1993) pp. 5226-5229, Part 1, No. 11B. Nov. 1993.
Hiroko Iwasaki et al. "Completely Erasable Phase Change Optical Disk", Jpn. J. Appl. Phys. vol. 31 (1992) pp. 461-465 Part 1, No. 2B, Feb. 1992.

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