US 6,606,292 B2Granted

Recording method for phase-change recording medium

AssigneeMitsubishi Chemical Corporation

InventorTakashi Ohno

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Abstract

In a recording method for a rewritable optical recording medium, immediately before a prospective leading pulse that is a time section where recording light of write power Pw irradiates a phase-change recording layer for the first time as a front low-power energy irradiating step, light of bias power Pb irradiates the phase-change recording layer for a first set time length yT as a preceding low-power energy irradiation step. And immediately after the leading pulse, the light of bias power Pb irradiates the phase-change recording layer for a set time length xT as a succeeding low-power energy irradiation step. The relation between x and y satisfies: 0.95≦x+0.7*y≦2.5. The high-power energy beam irradiates the recording medium in such a manner that a period of irradiation for pulses subsequent to the leading pulse is in a range of from 0.5T to 2.5T. The result is that it is possible to facilitate forming/erasing amorphous marks even in a phase-change recording medium devoid of a reflective layer, without any risk of narrowing the range of effective crystallization speeds.

Claims8

Dependent claims

A recording method for a phase-change recording medium having a phase-change recording layer in which amorphous marks each having a time length nT (T is the data reference clock period, and n is a natural number equal to or larger than 4) are formed by alternately irradiating the recording medium at least with a high-power energy beam having a relatively high power value and a low-power energy beam having a relatively low power value, said method comprising the steps of:

(a-1) irradiating the low-power energy beam to the recording medium for a first set time yT (y is a natural number larger than 0) as a preceding low-power pulse irradiation step immediately before a prospective leading pulse that is a time section where the high-power beam is irradiated for the first time, and
(a-2) irradiating the low-power energy beam to the recording medium for a second set time xT (x is a natural number larger than 0) as a succeeding low-power pulse irradiation step immediately after said prospective leading pulse,
x and y having a relation expressed by the following formula (A)
0.95≦x+0.7*y≦2.5 (A)
where * is an arithmetic symbol representing a multiplication.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/165,285Filed 7 Jun 2002 · continuation
Priority: JP 2000-00827517 Jan 2000
Published: US 2002/0167879 A114 Nov 2002
Granted: 12 Aug 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G11B 7/0062
Overwriting: overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media
G11B 7/00454
Recording: involving phase-change effects
G11B 7/006
Recording, reproducing or erasing methods; Read, write or erase circuits therefor: overwriting
G11B 7/126
Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for…

Family

Application09/753,911Parent of this continuation · filed 3 Jan 2001
US 2002/0167879 A1Pre-grant publication · published 14 Nov 2002
US 6,424,610 B1Parent of this continuation
US 2001/0012253 A1Published application
US 6,606,292 B2This patent

From the US filing history. Foreign family members aren’t listed.