CN100440334C - Optical recording method, optical recording apparatus and optical storage medium - Google Patents
Optical recording method, optical recording apparatus and optical storage medium Download PDFInfo
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Abstract
An optical storage medium comprising: a substrate; a recording layer for recording a recorded mark representing information to be recorded by irradiating a recording light beam onto the recording layer in accordance with a recording pulse pattern of recording pulses rising from an erasing power and formed between a recording power larger than the erasing power and a bottom power smaller than the erasing power and of erasing pulses rising from the bottom power to the erasing power. The recording layer has been initialized with an initialization laser beam having the erasing power satisfying expressions (1) and (2): 1.000<(R1/R0)<1.030 (1); 0.030<(R10/R0)-(R1/R0)<0.150 (2), in which R0 is a reflectivity exhibited by an un-recorded section of the recording layer, on which no data has ever been recorded, when irradiated with a reproducing light beam, R1 is a reflectivity exhibited by the un-recorded section when irradiated with the reproducing light beam after irradiated once with a light beam having the erasing power, and R10 is a reflectivity exhibited by the un-recorded section when irradiated with the reproducing light beam after irradiated ten times with a light beam having the erasing power.
Description
The application is based on application number: 200510004793.5, and the applying date: on January 26th, 2005, denomination of invention: the application for a patent for invention of " optic recording method, optical recorder and optical recording media " and dividing an application of proposing.
Technical field
The present invention relates to by irradiates light (for example laser) write down, wipe, optic recording method, optical recorder and the optical recording media of information reproduction.The present invention provides a kind of optic recording method, optical recorder and optical recording media especially, can obtain good rewriting characteristic when carrying out optical recording with high linear speed (high power speed) on rewritable phase-change recording media such as CD, light-card.
In addition, a kind of optic recording method, optical recorder and optical recording media are provided, on the phase-change recording medium, when carrying out optical recording, can both obtain good rewriting characteristic on any linear velocity in a plurality of linear velocities with the linear velocity of to a plurality of linear velocities of high linear speed (high power speed), selecting from low linear velocity (low power speed).
Background technology
So-called phase-change optical recording medium for example is CD-RW, DVD-RW or the DVD-RAM that occurs in recent years, is the medium that can rewrite information.Especially DVD-RW or DVD-RAM are mainly used in record, rewrite the such information that contains much information of image information.To phase-change optical recording medium, except requiring good recording characteristic, also require good rewriting characteristic.
The structure and the recording method of existing rewritable phase-change optical recording medium are as described below.
The structure of phase-change optical recording medium is, being on the substrate of bottom surface to have recoding/reproduction or to wipe the face that the laser of each power of usefulness is irradiated to, stacked gradually dielectric layer, recording layer, dielectric layer, reflection horizon at least.On the phase-change optical recording medium that constitutes like this, by recording impulse being applied (irradiation) fusion to the recording layer, chilling recording layer with the laser of recording power when the record, thereby form amorphous record mark.The reflectivity of this record mark is lower than the reflectivity of the recording layer of crystalline state, so can read this record mark as recorded information with optical mode.Wiping under the situation of this record mark, by the laser of the irradiation power (erase power) littler than recording power, make recording layer reach the temperature that Tc is above, fusing point is following, become crystalline state from non-crystalline state, wipe record mark, make it possible to rewrite.
In TOHKEMY 2002-237089 communique and Te Kai 2003-200665 communique, good jittering characteristic during with high-speed record and to rewrite characteristic be purpose has proposed a kind of optic recording method and optical recording media that makes the reflectivity of recording portion not be lower than the reflectivity of recording portion.Yet the inventor distinguishes by research, only uses the optic recording method that proposed and optical recording media can not obtain enough rewriting characteristics (the particularly characteristic that rewrites for the 1st time) on high linear speed (for example DVD4 times more than the speed).
In recent years, the optical recording media of 1 times of speed of DVD many times (for example 4 times of speed) occurred supporting, can write down recorded information with the linear velocity of from a plurality of linear velocities, selecting.In order to support this many speedization, in TOHKEMY 2000-155945 communique, a kind of recording method has been proposed, recording power Pwh when recording power Pwl when low linear velocity is write down and the power ratio (Pel/Pwl) between the erase power Pel write down less than high linear speed and the power ratio (Peh/Pwh) between the erase power Peh.But the inventor learns by research, in the method, when high linear speed writes down, erase power Peh height, so it is decrystallized to become the part of crystallization portion, recording characteristic worsens during than first record.In addition, even carried out accelerating the adjustment such as crystallization rate of recording film component in order to prevent that this is decrystallized, erase power Peh is also high, so segregation of occurrence record film easily, reflectivity reduces when the duplicate record more than 1,000 times, and recording characteristic worsens, and is undesirable concerning rewriteeing.
In TOHKEMY 2002-92889 communique, a kind of recording method has been proposed, make erase power Pe and line speed record or recording power irrelevant and keep constant.But the inventor learns that by research when writing down with low linear velocity, middle linear velocity and high linear speed, each linear velocity has the optimum erase power value, so can not obtain good recording characteristic on the linear velocity of very wide (low～height).
In TOHKEMY 2001-297481 communique, a kind of relation has been proposed, among power ratio (Pe/Pw) L on low linear velocity, power ratio (Pe/Pw) ref and power ratio (Pe/Pw) H on the high linear speed on the middle linear velocity, (Pe/Pw) L of the H of ref＞(Pe/Pw)＞(Pe/Pw).But the inventor learns that by research in the method, particularly erase power is little on low linear velocity, so the rewriting characteristic of few number of times is bad.
Patent documentation 1: TOHKEMY 2002-237089 communique
Patent documentation 2: TOHKEMY 2003-200665 communique
Patent documentation 3: TOHKEMY 2000-155945 communique
Patent documentation 4: TOHKEMY 2002-92889 communique
Patent documentation 5: TOHKEMY 2001-297481 communique
As mentioned above, make the reflectivity of recording portion not be lower than record back/after wiping reflectivity existing optic recording method or reduce initialization in advance after the existing optical recording media of reflectivity of the not recording portion jittering characteristic after when high-speed record, rewriteeing not enough, be difficult to fully guarantee to rewrite characteristic.
In addition, support that the existing recorded method of many speedization of optical recording media is following method, the high more power ratio that then increases more of line speed record perhaps makes power ratio maximum on the middle linear velocity, minimum on low linear velocity, perhaps makes erase power all keep constant on any linear velocity.But in these methods, because the erase power Peh on the high line speed record is big, so be difficult to fully guarantee first recording characteristic or rewrite characteristic; Perhaps because the erase power PeL on the low line speed record is low, so be difficult to fully guarantee to rewrite characteristic.
Summary of the invention
Therefore, the present invention proposes in order to address the above problem, its purpose is to provide a kind of optic recording method, optical recorder and optical recording media, even (for example 4 times of speed of DVD (linear velocity: 14m/s) above high linear speed writes down) also can obtain good recording characteristic, can also keep well 1 time or regenerative recording characteristic repeatedly to accelerate writing speed.
In addition, its purpose is to provide a kind of optic recording method, optical recorder and optical recording media, stipulate the record condition on each line speed record when under with a plurality of speed, writing down, from low line speed record to high line speed record (for example from the low linear velocity of 1 times of speed of DVD to 4 times of speed of DVD (linear velocity: can both obtain good recording characteristic the record of the high linear speed 14.0m/s)), can also keep well 1 time or rewriting characteristic repeatedly.
In order to solve above-mentioned problem, the invention provides optic recording method, optical recorder and the optical recording media of following (a)～(s).
(a) a kind of optic recording method is recorded in recorded information on the recording layer 3 of phase-change optical recording medium A, and it comprises: modulation step, and modulate above-mentioned recorded information and generate modulating data; Mark lengths generates step, generates the mark lengths of expectation according to above-mentioned modulating data; And recording step, generate the recording impulse pattern according to above-mentioned mark lengths, and write down the record mark of the above-mentioned recorded information of expression to above-mentioned recording layer irradiation recording light according to above-mentioned recording impulse pattern, wherein, this recording impulse pattern comprises: rises and at the recording power Pw bigger and the recording impulse Ttop, the Tmp that form between the little lowest power Pb than above-mentioned erase power from erase power Pe than above-mentioned erase power, and the erasing pulse Tcl that rises to above-mentioned erase power from above-mentioned lowest power; Irradiation on the not recording portion that does not once also write down recorded information on above-mentioned recording layer during playback light the reflectivity of above-mentioned not recording portion be made as R0, on above-mentioned not recording portion, shone the light that has above-mentioned erase power for 1 time after during the above-mentioned playback light of irradiation the reflectivity of above-mentioned not recording portion be made as under the situation of R1, above-mentioned recording step adopts following (1) formula that makes
1.000＜R1/R0＜1.030…(1)
The optimum erase power of setting up is as above-mentioned erase power.
(b) as (a) described optic recording method, establishing above-mentioned recording power is that Pw, above-mentioned erase power are Pe, the power ratio ε (ε=Pe/Pw) be of above-mentioned erase power Pe and above-mentioned recording power Pw
0.20≤ε≤0.40。
(c) a kind of optical recorder is recorded in recorded information on the recording layer 3 of phase-change optical recording medium A, and it comprises: scrambler 42, and modulate above-mentioned recorded information and generate modulating data; Mark lengths generating unit 41 generates the mark lengths of expectation according to above-mentioned modulating data; And recording portion 400, generate the recording impulse pattern according to above-mentioned mark lengths, and write down the record mark of the above-mentioned recorded information of expression to above-mentioned recording layer irradiation recording light according to above-mentioned recording impulse pattern, wherein, this recording impulse pattern comprises: rises and at the recording power Pw bigger and the recording impulse Ttop, the Tmp that form between the little lowest power Pb than above-mentioned erase power from erase power Pe than above-mentioned erase power, and the erasing pulse Tcl that rises to above-mentioned erase power from above-mentioned lowest power; Irradiation on the not recording portion that does not once also write down recorded information on above-mentioned recording layer during playback light the reflectivity of above-mentioned not recording portion be made as R0, on above-mentioned not recording portion, shone the light that has above-mentioned erase power for 1 time after during the above-mentioned playback light of irradiation the reflectivity of above-mentioned not recording portion be made as under the situation of R1, above-mentioned recording portion adopts following (1) formula that makes
1.000＜R1/R0＜1.030…(1)
The optimum erase power of setting up is as above-mentioned erase power.
(d) as (c) described optical recorder, it has preservation portion 451, preserves the identifying information of the above-mentioned optimum erase power of expression; Above-mentioned recording portion decides above-mentioned optimum erase power according to the above-mentioned identifying information of preserving in the above-mentioned preservation portion.
(e) as (c) described optical recorder, it has reading part 34, reads in the identifying information of the above-mentioned optimum erase power of expression that the regulation zone of above-mentioned optical recording media writes; Above-mentioned recording portion decides above-mentioned optimum erase power according to the above-mentioned identifying information that above-mentioned reading part reads.
(f) as (c) described optical recorder, it has reflectivity test section 46, obtains above-mentioned R0 and a plurality of above-mentioned R1 corresponding with a plurality of above-mentioned erase powers, from the combination of above-mentioned R0 and a plurality of above-mentioned R1, selects the combination that above-mentioned (1) formula is set up; The combination that above-mentioned recording portion is selected according to above-mentioned reflectivity test section decides above-mentioned optimum erase power.
(g) as each described optical recorder in (c) to (f), establishing above-mentioned recording power is that Pw, above-mentioned erase power are Pe, the power ratio ε (ε=Pe/Pw) be of above-mentioned erase power Pe and above-mentioned recording power Pw
0.20≤ε≤0.40。
(h) a kind of optical recording media, be phase-change optical recording medium A, it comprises: recording layer 3, by write down the record mark of expression recorded information according to recording impulse patterned illumination recording light, this recording impulse pattern comprises: rises and at the recording power Pw bigger and the recording impulse Ttop, the Tmp that form between the little lowest power Pb than above-mentioned erase power from erase power Pe than above-mentioned erase power, and the erasing pulse Tcl that rises to above-mentioned erase power from above-mentioned lowest power;
On above-mentioned recording layer once also not on the not recording portion of recorded information during the irradiation playback light reflectivity of above-mentioned not recording portion be made as R0, on above-mentioned not recording portion, shone the light that has above-mentioned erase power for 1 time after during the above-mentioned playback light of irradiation the reflectivity of above-mentioned not recording portion be made as R1, on above-mentioned not recording portion, shone the light that has above-mentioned erase power for 10 times after during the above-mentioned playback light of irradiation the reflectivity of above-mentioned not recording portion be made as under the situation of R10, above-mentioned recording layer carries out initialization by initialization laser, make as above-mentioned erase power following (1), (2) formula
1.000＜R1/R0＜1.030…(1)
0.030＜R10/R0-R1/R0＜0.150…(2)
Set up.
(i) as (h) described optical recording media, be that Pw, above-mentioned erase power are Pe establishing above-mentioned recording power, the power ratio of establishing above-mentioned erase power Pe and above-mentioned recording power Pw is that ε (during ε=Pe/Pw), has write on the regulation zone and is used to satisfy
0.20≤ε≤0.40
Information.
(j) as (h) or (i) described optical recording media, with the power of above-mentioned initialization laser divided by the irradiated area of above-mentioned initialization laser, when being made as initialization laser power density Di divided by the value of the sweep velocity gained of above-mentioned initialization laser again, above-mentioned recording layer with
1.20≤Di≤155
Condition be initialised.
(k) a kind of optic recording method is recorded in recorded information on the recording layer 3 of phase-change optical recording medium A, and it comprises: modulation step, and modulate above-mentioned recorded information and generate modulating data; Mark lengths generates step, generates the mark lengths of expectation according to above-mentioned modulating data; And recording step, generate the recording impulse pattern according to above-mentioned mark lengths, and write down the record mark of the above-mentioned recorded information of expression to above-mentioned recording layer irradiation recording light according to above-mentioned recording impulse pattern, wherein, this recording impulse pattern comprises: rises and at the recording power Pw bigger and the recording impulse Ttop, the Tmp that form between the little lowest power Pb than above-mentioned erase power from erase power Pe than above-mentioned erase power, and the erasing pulse Tcl that rises to above-mentioned erase power from above-mentioned lowest power; Above-mentioned recording step carries out record with the line speed record of selecting to above-mentioned recording layer from the 1st line speed record Vl, the 2nd line speed record Vm and the 3rd line speed record Vh, wherein, and Vl＜Vm＜Vh; The record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording step, in record that carries out with above-mentioned the 2nd line speed record Vm and the record that carries out with above-mentioned the 3rd line speed record Vh, the 1st erase power Pel on above-mentioned the 1st line speed record Vl is divided by the 1st power ratio ε l of the 1st recording power Pwl gained, the 2nd erase power Pem on above-mentioned the 2nd line speed record Vm is divided by the 2nd power ratio ε m of the 2nd recording power Pwm gained, and the 3rd erase power Peh on above-mentioned the 3rd line speed record Vh satisfies the relation of following (1) formula divided by the 3rd power ratio ε h of the 3rd recording power Pwh gained:
εh＜εm＜εl …(1)。
(l) as (k) described optic recording method, when the ratio ε h/ ε l that establishes above-mentioned the 3rd power ratio ε h and above-mentioned the 1st power ratio ε l is α, record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording step and the relation that satisfies following (2) formula with the record that above-mentioned the 3rd line speed record Vh carries out:
0.45＜α＜0.80 …(2)。
(m) as (k) or (1) described optic recording method, it is characterized in that the record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording step, the record that carries out with above-mentioned the 2nd line speed record Vm and the relation that satisfies following (3) formula with the record that above-mentioned the 3rd line speed record Vh carries out:
Pwl＜Pwm＜Pwh …(3)。
(n) a kind of optical recorder is recorded in recorded information on the recording layer 3 of phase-change optical recording medium A, and it comprises: scrambler 42, and modulate above-mentioned recorded information and generate modulating data; Mark lengths generating unit 41 generates the mark lengths of expectation according to above-mentioned modulating data; And recording portion 400, generate the recording impulse pattern according to above-mentioned mark lengths, and write down the record mark of the above-mentioned recorded information of expression to above-mentioned recording layer irradiation recording light according to above-mentioned recording impulse pattern, wherein, this recording impulse pattern comprises: rises and at the recording power Pw bigger and the recording impulse Ttop, the Tmp that form between the little lowest power Pb than above-mentioned erase power from erase power Pe than above-mentioned erase power, and the erasing pulse Tcl that rises to above-mentioned erase power from above-mentioned lowest power; Above-mentioned recording portion is carried out record with the line speed record of selecting to above-mentioned recording layer from the 1st line speed record Vl, the 2nd line speed record Vm and the 3rd line speed record Vh, wherein, and Vl＜Vm＜Vh; The record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording portion, in record that carries out with above-mentioned the 2nd line speed record Vm and the record that carries out with above-mentioned the 3rd line speed record Vh, the 1st erase power Pel on above-mentioned the 1st line speed record Vl is divided by the 1st power ratio ε l of the 1st recording power Pwl gained, the 2nd erase power Pem on above-mentioned the 2nd line speed record Vm is divided by the 2nd power ratio ε m of the 2nd recording power Pwm gained, and the 3rd erase power Peh on above-mentioned the 3rd line speed record Vh satisfies the relation of following (1) formula divided by the 3rd power ratio ε h of the 3rd recording power Pwh gained:
εh＜εm＜εl …(1)。
(o) as (n) described optical recorder, when the ratio ε h/ ε l that establishes above-mentioned the 3rd power ratio ε h and above-mentioned the 1st power ratio ε l is α, record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording portion and the relation that satisfies following (2) formula with the record that above-mentioned the 3rd line speed record Vh carries out:
0.45＜α＜0.80 …(2)。
(p) as (n) or (o) described optical recorder, it is characterized in that the record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording portion, the record that carries out with above-mentioned the 2nd line speed record Vm and the relation that satisfies following (3) formula with the record that above-mentioned the 3rd line speed record Vh carries out:
Pwl＜Pwm＜Pwh …(3)。
(q) a kind of optical recording media, be phase-change optical recording medium (A), it comprises: recording layer 3, by write down the record mark of expression recorded information according to recording impulse patterned illumination recording light, this recording impulse pattern comprises: rises and at the recording power Pw bigger and the recording impulse Ttop, the Tmp that form between the little lowest power Pb than above-mentioned erase power from erase power Pe than above-mentioned erase power, and the erasing pulse Tcl that rises to above-mentioned erase power from above-mentioned lowest power; Expression the 1st line speed record Vl at the regulation regional record of above-mentioned recording layer, each recording power on the 2nd line speed record Vm and the 3rd line speed record Vh and the identifying information of erase power, Vl＜Vm＜Vh wherein, above-mentioned identifying information, with the 1st erase power Pel on above-mentioned the 1st line speed record Vl the 1st power ratio ε l divided by the 1st recording power Pwl gained, the 2nd erase power Pem on above-mentioned the 2nd line speed record Vm is divided by the 2nd power ratio ε m of the 2nd recording power Pwm gained, the 3rd erase power Peh on above-mentioned the 3rd line speed record Vh satisfies the relation of following (1) formula divided by the 3rd power ratio ε h of the 3rd recording power Pwh gained:
εh＜εm＜εl …(1)。
(r) as (q) described optical recording media, when the ratio ε h/ ε l that establishes above-mentioned the 3rd power ratio ε h and above-mentioned the 1st power ratio ε l was α, above-mentioned identifying information satisfied the relation of following (2) formula:
0.45＜α＜0.80 …(2)。
(s) as claim (q) or (r) described optical recording media, above-mentioned identifying information satisfies the relation of following (3) formula:
Pwl＜Pwm＜Pwh …(3)。
The invention effect
Even the quickening writing speed also can obtain good recording characteristic, moreover, also can keep recording characteristic well even carry out 1 time or repeatedly rewrite.
In addition, even in the multiple speedization of line speed record, also can obtain good recording characteristic, moreover, also can keep its characteristic well even carry out 1 time or repeatedly rewrite.
Description of drawings
Fig. 1 is the manufacturing equipment 300 of expression phase-change optical recording medium or the figure of the manufacturing/initialization operation of carrying out with manufacturing equipment 300.
Fig. 2 is the amplification profile of an embodiment of optical recording media of the present invention.
Fig. 3 is the vertical view of an embodiment of optical recording media of the present invention.
Fig. 4 is the figure of first example of expression recording impulse pattern.
Fig. 5 is the figure of second example of expression recording impulse pattern.
Fig. 6 is the block scheme of an embodiment of expression optical recorder of the present invention.
Fig. 7 is the figure that concerns between the R0 of the optical recording media A after expression initialization laser power density Di and the initialization.
Fig. 8 be DOW number on expression reflectivity regions B～D shown in Figure 7 and shake between the DOW jittering characteristic figure of relation.
Fig. 9 be expression on the DOW1 shake and the figure of the relation between the power ratio ε.
Figure 10 is the DOW jittering characteristic figure of the relation of expression shake and DOW number.
Figure 11 is the figure of the relation of the DOW9 shake on each line speed record of expression embodiment D-1 and each Comparative Example D.
Figure 12 is the figure of the relation of the DOW9 shake on each line speed record of expression embodiment E-1 and each Comparative Example E.
Figure 13 is the DOW1 shake in expression each embodiment F and each Comparative Example F and the figure of the relation between the coefficient A.
Figure 14 is the DOW1 shake among expression each embodiment G and each the comparative example G and the figure of the relation between the coefficient A.
Figure 15 is the figure of expression signal intensity.
Figure 16 is the amplification profile of another embodiment of expression optical recording media of the present invention.
Embodiment
Fig. 1 is that expression is used to make the manufacturing equipment 300 of phase-change optical recording medium or the figure of the manufacturing/initialization operation of carrying out with manufacturing equipment 300.In manufacturing installation 100 (manufacturing process), make phase-change optical recording medium, in apparatus for initializing 200 (initialization operation), phase-change optical recording medium is carried out initialization.Phase-change optical recording medium through the initialization operation dispatches from the factory as optical recording media A.
As phase-change optical recording medium, phase transition optical disk, light-cards etc. such as the DVD-RW medium of rewrite information is repeatedly arranged.Wherein, in the following description,, use phase transition optical disk (optical recording media A), certainly in addition light-card etc. is had with the phase-change optical recording medium of spline structure and also can use the present invention as an embodiment of phase-change optical recording medium.
The structure of＜optical recording media 〉
Fig. 2 is the amplification profile of the optical recording media A of an embodiment of the present invention.The basic structure of optical recording media A is, being on the substrate 1 of bottom surface with recoding/reproduction or the plane of incidence 1a that wipes with laser incident, stacked gradually the 1st protective seam 2, recording layer the 3, the 2nd protective seam 4, reflection horizon the 5, the 3rd protective seam 6.
As the material of substrate 1, can use various transparent synthetic resin, clear glass etc.For fear of adhering to or the influence of the scuffing of substrate 1 etc. of dust, use transparent substrate 1, with the laser of assembling recorded information from the plane of incidence 1a side direction recording layer 3 of substrate 1.As the material of this substrate 1, glass, polycarbonate, polymethylmethacrylate, polyolefin resin, epoxy resin, polyimide resin etc. are for example arranged.Particularly polycarbonate is owing to optical birefringence and little, the easy shaping of hydroscopicity, so more satisfactory.
The thickness of substrate 1 has no particular limits, but considers the compatibility with DVD, and 0.01mm～0.6mm is more satisfactory, especially 0.6mm the most desirable (gross thickness of DVD is 1.2mm).This is because if the thickness of substrate 1 is lower than 0.01mm, even then under situation about writing down with the laser of focusing from the plane of incidence 1a side of substrate 1, also be subjected to the influence of dirt easily.In addition, if without limits, then in practicality, be in the scope of 0.01mm～5mm and get final product the gross thickness of optical recording media.This be because, if more than 5mm, then be difficult to increase the numerical aperture of object lens, the spot definition of irradiating laser is big, so be difficult to improve recording density.
The 1st protective seam 2 and the 2nd protective seam 4 have the effect that protective substrate 1, recording layer 3 are not heated; for example prevent to make recording characteristic deterioration etc., perhaps improve the effect of the signal contrast when reproducing by optical interference effects in the temperature distortion such as substrate 1, recording layer 3 of when record.
The 1st protective seam 2 and the 2nd protective seam 4 are respectively transparent for recoding/reproduction or the laser of wiping usefulness, and refractive index n is in the scope of 1.9≤n≤2.3 more satisfactory.Moreover from the thermal characteristics aspect, the material of the 1st protective seam 2 and the 2nd protective seam 4 is SiO
2, SiO, ZnO, TiO
2, Ta
2O
5, Nb
2O
5, ZrO
2, oxide, ZnS, In such as MgO
2S
3, TaS
4The simple substance and the potpourri of carbonide such as sulfides, SiC, TaC, WC, TiC are more satisfactory.Especially ZnS and SiO
2Hybrid films, even owing to duplicate record, wipe, recording sensitivity, C/N, erasure rate etc. also are not easy to worsen, so desirable especially.
In addition, the 1st protective seam 2 and the 2nd protective seam 4 can not be same material, composition, are made of also harmless different materials.
The thickness of the 1st protective seam 2 roughly is in the scope of 5nm～500nm.Moreover, in order to be difficult to peel off, defective such as being difficult to crack from substrate 1 or recording layer 3, the thickness of the 1st protective seam 2 is in the scope of 20nm～300nm more satisfactory.If thinner, then be difficult to guarantee the optical characteristics of coiling than 20mm; If thicker than 300nm, then throughput rate is low.Wherein, better is the scope of 30nm～80nm.
In order to make recording characteristics such as C/N, erasure rate good, can stably rewrite repeatedly, the thickness of the 2nd protective seam 4 is in the scope of 5nm～40nm more satisfactory.If thinner than 5nm, then recording layer 3 is difficult to insulation, so optimal recording power rises; If thicker, then cause rewriteeing characteristic degradation than 40nm.Better is the scope of 8nm～20nm.
Recording layer 3 is to contain at least a alloy-layer among Ag or Si, Al, Ti, Bi, the Ga in Ag-In-Sb-Te alloy, Ge-In-Sb-Te alloy or Ge-In-Sb-Te alloy.In addition, the bed thickness of recording layer 3 is that 10nm～25nm is more satisfactory.If bed thickness is thinner than 10nm, then crystallization rate reduces, and the high-speed record characteristic is poor; If thicker, then when record, need big laser power than 25nm.
Single face or the two-sided contact bed that joins with recording layer 3 can be set.As the material of contact bed, sulfur-bearing is very unimportant.If the material of sulfur-bearing is used as contact bed, then owing to rewrite repeatedly, the sulphur that comprises in the contact bed is diffused in the recording layer 3 sometimes, and recording characteristic worsens, so undesirable.In addition, also undesirable from the not good enough this point of erasing characteristic.
Material as contact bed, at least a kind the material that comprises in nitride, oxide, the carbonide is more satisfactory, specifically, at least a kind the material that comprises in germanium nitride, silicon nitride, aluminium nitride, aluminium oxide, zirconia, chromium oxide, silit, the carbon is more satisfactory.In addition, also can make these materials contain aerobic, nitrogen, hydrogen etc.Above-mentioned nitride, oxide, carbonide can not be stoichiometric compositions also, also can nitrogen, oxygen, carbon is superfluous or not enough.Thus, the characteristic of contact bed improves sometimes, and for example contact bed is difficult to peel off, raising such as anti-keeping quality etc.
Material as reflection horizon 5, metals such as Al, Au with light reflective, Ag are arranged, be major component, comprise the alloy of the interpolation element of forming by metal more than a kind or semiconductor with these metals, and in these metals, mixed material that metallic compounds such as metal nitrides such as Al, Si, metal oxide, metal chalcogenide form etc.
Especially metals such as Al, Au, Ag, and be the alloy light reflective height of major component with these metals, and can improve coefficient of heat conductivity, so more satisfactory.Example as alloy, mix the alloy that at least a kind of element among Si, Mg, Cu, Pd, Ti, Cr, Hf, Ta, Nb, Mn, the Zr etc. forms among the general oriented Al, perhaps in Au or Ag, mixed the alloy that at least a kind of element among Cr, Ag, Cu, Pd, Pt, Ni, Nd, In, the Ca etc. forms.But,, be that the metal or alloy of major component is more satisfactory with the higher Ag of coefficient of heat conductivity from the recording characteristic aspect considering under the situation of high linear speed record.
Wherein, adopted in reflection horizon 5 under the situation of fine silver or silver alloy, in order to suppress the generation of AgS compound, the layer that joins with reflection horizon 5 adopts the material that does not contain S more satisfactory.
The thickness in reflection horizon 5 changes according to the size of the coefficient of heat conductivity of the material that forms reflection horizon 5, but 50nm～300nm is more satisfactory.If the thickness in reflection horizon 5 is more than 50nm, then reflection horizon 5 does not optically change, and does not influence the value of reflectivity; If it is the thickness in reflection horizon 5 increases, then very big to the cooling velocity influence.In addition, form the thickness that surpasses 300nm and on making, need the time.Therefore, by adopting the high material of coefficient of heat conductivity, the bed thickness in reflection horizon 5 is controlled in the optimum range as far as possible.
Here, adopt ZnS and SiO at the 2nd protective seam 4
2Compound, reflection horizon 5 adopt under the situation of Ag or Ag alloy, between the 2nd protective seam 4 and reflection horizon 5, insert diffusion and prevent that layer (not shown) is more satisfactory.This is to reduce owing to the reflectivity that AgS compound that the S in the 2nd protective seam 4 and the chemical reaction between the Ag in the reflection horizon 5 generate causes in order to suppress.
Prevent the material of layer as diffusion, same with above-mentioned contact bed, be that the material of not sulfur-bearing is very important, concrete material is identical with the material of contact bed.
The manufacture method of＜optical recording media 〉
Then, the method for making optical recording media in the manufacturing installation 100 is described.
Method as the 1st protective seam 2, recording layer the 3, the 2nd protective seam 4, reflection horizon 5 etc. being layered on the substrate 1 has the film forming method in the known vacuum.For example be vacuum vapour deposition (resistance heated type or electron beam type), ion plating method, sputtering method (direct current or interchange sputter, reactive sputtering), particularly sputtering method is controlled composition, bed thickness easily, so more satisfactory.
In addition, use in vacuum tank to a plurality of substrates 1 simultaneously film forming batch method or the sheet leaf formula film formation device of treatment substrate 1 is more satisfactory piecewise.The layer thickness control in the 1st protective seam 2 that forms, recording layer the 3, the 2nd protective seam 4, reflection horizon 5 etc. can be by the control shielding power supply connection power and time or easily carry out with quartz oscillation type film thickness gauge supervision sedimentation state.
In addition, the formation in the 1st protective seam 2, recording layer the 3, the 2nd protective seam 4, reflection horizon 5 etc. can be fixing or move, carry out under any state of rotary plate 1.Because the excellent in uniform of bed thickness in face, institute is so that substrate 1 rotation is more satisfactory, and is better with the revolution combination.If cooling base 1 where necessary, then can reduce the set-back of substrate 1.
In addition, significantly do not damaging in the scope of effect of the present invention, also can be after having formed reflection horizon 5 grades, for each layer distortion of preventing to have formed etc., be provided with where necessary and adopt ZnS, SiO
2Deng dielectric layer or the resin protective layer that adopts ultraviolet curable resin etc. as the 3rd protective seam 6.
After this, also can prepare 1 substrate 1 that has formed each layer equally again, 2 plate bases, 1 usefulness bonding agent etc. is bonding, make two-sided optical recording media.
Then, describe 200 pairs of optical recording medias of apparatus for initializing and carry out initialized method.As mentioned above, in the present embodiment, optical recording media A dispatches from the factory after the initialization operation of apparatus for initializing 200.Initialization is that the light to recording layer 3 irradiating lasers, xenon flash lamp etc. heats, and makes the constituent material crystallization of recording layer 3.Because reproduction noise is few, so it is more satisfactory to carry out initialization with laser.
In the present embodiment, the initialization condition (the sweep trace speed and the power of initialization laser) that is used to obtain optical recording media A has a feature.The back will be described this.
Fig. 3 illustrates the vertical view of optical recording media A.Optical recording media A has the clamp area 52 of center pit and its periphery.On the concentric circles of the periphery of clamp area 52, be provided with block of information (Lead-In Area) 53, its more the zone of periphery be the recording areas 54 that is used for real data such as recording image information or acoustic information.Here, Lead-In Area 53 can be any in rom state or the RAM state.In addition, also have by being used for obtaining the laser aiming groove formation swing in high frequency of tracking signal or the method for recording information that pit is preserved the reproduction special use.
In Lead-In Area 53, writing down the record condition that is used to make optical recording media A obtain superperformance as identifying information.The laser intensity or the aftermentioned of used laser were represented the record condition of the relation that (4) formula, (5) formula, (6) formula are such when identifying information for example was a formation record mark described later.
The recording method of＜optical recording media 〉
Fig. 4 illustrates the recording impulse pattern that uses when optical recording media A goes up recorded information.Laser is modulated with three values (recording power Pw, erase power Pe, lowest power Pb) laser intensity according to the recording impulse pattern, mark lengths corresponding to tracer signal increases and decreases umber of pulse, and the record mark of mark lengths of expectation is formed on the recording layer 3.In laser intensity, recording power Pw maximum, erase power Pe takes second place, lowest power Pb minimum.
The recording impulse pattern is made up of following pulse as shown in Figure 4: pulse Ttop ahead, rise from erase power Pe, and apply laser with recording power Pw to recording layer 3 at first; Multiple-pulse Tmp follows pulse Ttop ahead, alternately applies recording power Pw and lowest power Pb; And erasing pulse Tcl, be positioned at end, laser is risen from lowest power Pb apply erase power Pe.Pulse Ttop and multiple-pulse Tmp are the recording impulses that is used for forming record mark on recording layer 3 ahead.Wherein, do not have multiple-pulse Tmp sometimes yet, only form recording impulse with pulse Ttop ahead.
For example in DVD-RW, mark lengths has these 10 kinds of 3T, 4T, 5T, 6T, 7T, 8T, 9T, 10T, 11T, 14T.In mark lengths is under the situation of nT, and the number of multiple-pulse Tmp generally is (n-1) or (n-2).Figure 4 illustrates the situation of (n-2).Here, so-called T is a unit clock, in DVD-RW, and (line speed record: 3.5m/s) 1T=38.2ns, (line speed record: 14.0m/s) 1T=9.6ns when 4 times of DVD are fast when 1 times of DVD is fast.
In addition, along with high speed record in recent years, unit clock T foreshortens to several ns magnitudes, considers the rising of laser pulse/decline response limit, and also can adopt shown in Figure 5 is the recording impulse pattern of benchmark with 2T.The recording impulse pattern that is used to form the record mark of mark lengths that recording impulse A has 3T, mark lengths that recording impulse B has 11T, mark lengths that recording impulse C has 14T shown in Figure 5.
＜optical recorder 〉
Fig. 6 illustrates and is used for and will has the optical recorder of laser radiation an embodiment of the present invention to the optical recording media A of the recording impulse pattern of expectation.
At first, spindle motor 31 makes optical recording media A rotation.Spin Control portion 32 controls, and makes that the rotating speed of spindle motor 31 is the line speed record corresponding with the purpose writing speed.In addition, the recoding/reproduction of optical recording media A or wipe used semiconductor laser (LD) 33, comprise the object lens (not shown) of the laser of assembling irradiation LD 33 and the shaven head 34 of four segmented sense optical elements (not shown) for example is provided on the radial direction of optical recording media A freely removable.
Wherein, as the used recording light source of the optical recorder of present embodiment, laser, the such high-intensity light source of flash light are more satisfactory.Especially the light source of semiconductor laser can miniaturization, and power consumption is little, and so modulation easily is more satisfactory.
Four segmented sense optical elements of shaven head 34 receive the reflected light that shines the laser on the optical recording media A from LD 33.Four segmented sense optical elements generate push-pull signal according to the light that receives, and output to swing detection portion 36.In addition, four segmented sense optical elements output to driving governor 44 according to the light that receives with focus error signal and tracking error signal.Moreover the composite signal of four segmented sense optical elements is that reproducing signal is output to reflectivity test section 46.
Driving governor 44 is controlled actuator control part 35 according to the focus error signal and the tracking error signal that are supplied to.Focusing and the tracking of 34 couples of optical recording media A of actuator control part 35 control shaven heads.
Recording clock generating unit 38 is controlled by driving governor 44.Driving governor 44 is also controlled Spin Control portion 32, actuator control part 35, swing detection portion 36, address demodulator circuit 37 and system controller 45.
Driving governor 44 will output to recording clock generating unit 38 from the swinging signal that swing detection portion 36 supplies with.In addition, will output to system controller 45 from the address information that address demodulator circuit 37 is supplied with.
Recording impulse generating unit 39 comprises pulse control signal generating unit 39t, multiple-pulse control signal generating unit 39m and erasing pulse control signal generating unit 39c ahead.Pulse control signal generating unit 39t generates pulse control signal ahead ahead, and multiple-pulse control signal generating unit 39m generates the multiple-pulse control signal, and erasing pulse control signal generating unit 39c generates the erasing pulse control signal.Each control signal is fed into LD drive division 43, switch portion 431 is come the drive current source 431e of drive current source 431w, the erase power Pe of switch recording power Pw, the drive current source 431b of lowest power Pb by the control signal that basis is supplied to, thereby generates the recording impulse pattern.
Pw drive current source 431w, Pe drive current source 431e and Pb drive current source 431b are according to recording power Pw, erase power Pe and the lowest power Pb of storage in the storer 451 of system controller 45, to bare headed 34 supplying electric currents.This three value is to be used to make the recording characteristic of optical recording media A to keep good optimum value, represents that the identifying information of this optimum value is kept in the storer 451 in advance, perhaps by the preservation of more newly arriving, perhaps also can utilize reflectivity test section 46 to obtain and preserve.Wherein, storer 451 for example is ROM (Read OnlyMemory, ROM (read-only memory)) or recordable RAM (Ramdom Access Memory, random access memory).
The optical recorder of present embodiment can corresponding optical recording media high linear speed (high power speed) change and set the line speed record of from a plurality of line speed records, selecting.System controller 45 be transfused to be used to select the indicator signal of line speed record (times fast mode) after, according to the identifying information of the indicated line speed record of storage in the storer 451, with above-mentioned Pw drive current source 431w, Pe drive current source 431e and the Pb drive current source 431b of controlling equally.The identifying information of in store a plurality of line speed records as described above in storer 451.
Identifying information shown in (4) formula, (5) formula, (6) formula also is stored in the storer 451 wherein, as described later.
The recording impulse pattern that generates is imported in the shaven head 34.Shaven head 34 makes the recording impulse pattern of LD 33 output expectations and the LD luminescent waveform of power ratio ε (Pw/Pw) recorded information to be recorded on the optical recording media A by controlling.
The mark lengths that recording impulse generating unit 39, LD drive division 43 and shaven head 34 generate according to mark lengths counter 41, generate by rise from erase power Pe and at the recording power Pw bigger and recording impulse that forms between the little lowest power Pb than erase power Pe and the recording impulse pattern of forming from the erasing pulse that lowest power Pb rises to erase power Pe, as working to the recording portion 400 that recording layer 3 irradiation recording light write down the record mark of representing recorded information from LD 33 according to the recording impulse pattern than erase power Pe.
The discussion of＜optimum erase power 〉
The inventor estimates that erase power Pe may influence the record of optical recording media and rewrite characteristic, finds that according to following embodiment A-1～A-3 and Comparative examples A-4～A-6 this estimation is correct, has to make record and rewrite characteristic to reach best optimum erase power.
In following each embodiment and each comparative example, the CD drive tester made from the PulseTech company (Pu Site electrical equipment Ltd) of the optical lens that has carried laser diode that wavelength is 658nm, NA=0.60 (DDU1000) has carried out writing down (single beam rewritings) and reproduction.
Tracer signal has been carried out the record-playback evaluation with 8-16 (EFM+) modulated random pattern.Bit length is 0.267 μ m/ bit, carries out the record with density with DVD-ROM, and capacity is equivalent to the 4.7G byte.Record be comprise adjacent session interior carried out rewriteeing for 10 times after, carry out amplitude limit with the center of the amplitude of its reproducing signal, measure clock to data shakes (Network ロ Star Network ト ウ one デ one ジ Star ).Wherein, the laser power Pr of playback light is 0.7mW, keeps constant.
In addition, Write strategy adopts the editing pulse sequence of the regulation that meets DVD-RW Version1.1 shown in Figure 4.
(embodiment A-1)
At diameter is that 120mm, thickness of slab are on the substrate 1 made of the polycarbonate resin of 0.6mm, has formed each layer of aftermentioned.On substrate 1, formed dead slot with channel separation 0.74 μ m.This groove depth is 25mm, and the wide ratio of groove width and bank (land) approximately is 40: 60.Wherein, groove is seen as convex from the recoding/reproduction or the incident direction of wiping with laser.
At first, will be vented to 3 * 10 in the vacuum tank
-4Behind the Pa, 2 * 10
-1Use the SiO that has added 20mol% in the argon gas atmosphere of Pa
2The ZnS target by the high frequency magnetron sputtering system, having formed bed thickness on substrate 1 is the 1st protective seam 2 of 70nm.
Then; successively with the plain single alloys target of the quaternary of Ge-In-Sb-Te stacked bed thickness be the recording layer 3 of 16nm; then use with the 1st protective seam 2 identical materials stacked bed thickness be the 2nd protective seam 4 of 16nm, having folded bed thickness with the Ag-Pd-Cu target layer is the reflection horizon 5 of 120nm.
After substrate 1 taken out in the vacuum tank; spin coating propylene class ultraviolet curable resin on this reflection horizon 5 (SK5110 that SonyChemical (Sony Chemical) company makes); make it solidify the 3rd protective seam 6 that forms 3 μ m by the ultraviolet ray irradiation, obtain optical recording media A shown in Figure 2.
The initialization of recording layer 3 is that 250 μ m, direction of scanning laser width are that the laser of 1.0 μ m is that 4.5m/s, laser power are that 1600mW, pitch of feed are to carry out under the initialization condition of 220 μ m in sweep trace speed with apparatus for initializing 200 (Computing Devices Company of Hitachi make POP120), with laser width radially.
Then, if from LD 33 on the recording areas 54 of optical recording media A, when once also the not recording portion of recorded information irradiation has the playback light (0.7mW) of laser power Pr not the reflectivity of recording portion be R0, after this has not shone the laser that has erase power Pe for 1 time on the recording portion, from LD 33 irradiations again during used laser not the reflectivity of recording portion be R1, obtain R0 and R1.
Then, from the groove of the recording layer 3 of the plane of incidence 1a lateral light recording medium A of substrate 1, carry out record.
The condition of record is that the recording impulse pattern is, during on-line velocity 14m/s (4 times of speed of DVD), and Ttop=0.6[T], Tmp=0.5[T] and, Tcl=0.0[T].In addition, the laser intensity of laser adopts recording power Pw=17.0[mW], erase power Pe=4.6[mW], lowest power Pb=0.5[mW] this three value.
The R0 of used optical recording media A is 17.4 among the present embodiment A-1, shines 1 time erase power Pe=4.6[mW] laser after R1 be 17.7 (R1/R0=1.017).The value conclusion that determines among the present embodiment A-1 is shown in table 1 (embodiment A-1).
Initial characteristic and regenerative recording characteristic are as shown in table 1, and first record (DOW0) shake is 6.5%, and rewriteeing 1 time (DOW1) shake is 8.0%, and rewriteeing 9 times (DOW9) shake is 7.5%.Moreover though record is dithered as 8.5% when rewriteeing (DOW10000) 10,000 times approximately, even rewrite, characteristic is all-the-time stable also, and recording characteristic is good.
Rewriting described here is that single beam rewrites, and is meant with 1 laser scanning to wipe the record mark that formed in the past, forms record mark again.And DOW0 (Direct Over Write: rewrite) is the first record that forms record mark on the not recording portion of the optical recording media A of initialization, and DOW1 forms the 1st time of record mark to rewrite again there.In addition, will be to the harmful effect of the error rate few value below 10% of shake will (rewrite 10,000 times) shake that can both stably obtain below 10% and be defined as good DOW jittering characteristic as good from recording for the first time from DOW0 to DOW10000.
[table 1]
(embodiment A-2)
With the optical recording media A identical, except erase power Pe is changed to 3.8[mW with embodiment A-1], carried out record, evaluation under other condition identical with embodiment A-1.R0 is 17.4, has shone erase power Pe=3.8[mW 1 time] laser after R1 be 17.5 (R1/R0=1.006).
Initial characteristic and regenerative recording characteristic are as shown in table 1, and the shake of DOW0 is 6.8%, and the shake of DOW1 is 8.6%, and the shake of DOW9 is 7.9%.Moreover though not record, DOW10000 is dithered as 9.2%, even rewrite, characteristic is all-the-time stable also, and recording characteristic and embodiment A-1 is same good.
(embodiment A-3)
With the optical recording media A identical, except erase power Pe is changed to 5.6[mW with embodiment A-1], carried out record, evaluation under other condition identical with embodiment A-1.R0 is 17.4, has shone erase power Pe=5.6[mW 1 time] laser after R1 be 17.9 (R1/R0=1.029).
Initial characteristic and regenerative recording characteristic are as shown in table 1, and the DOW0 shake is 7.0%, and the DOW1 shake is 8.7%, and the DOW9 shake is 8.4%.Moreover though not record, DOW10000 is dithered as 9.5%, even rewrite, characteristic is all-the-time stable also, and recording characteristic and embodiment A-1 is same good.
(Comparative examples A-4)
With the optical recording media A identical, except erase power Pe is changed to 6.0[mW with embodiment A-1], carried out record, evaluation under other condition identical with embodiment A-1.R0 is 17.4, has shone erase power Pe=6.0[mW 1 time] laser after R1 be 18.0 (R1/R0=1.034).
Initial characteristic and regenerative recording characteristic are as shown in table 1, and the DOW0 shake is 8.8%, and the DOW1 shake is 10.8%, and the shake of DOW9 is 9.0%.Moreover though not record, the DOW10000 shake is 12.2%, and shake has surpassed in DOW1 and DOW10000 influences 10% of error rate, and recording characteristic worsens.
(Comparative examples A-5)
With the optical recording media A identical, except erase power Pe is changed to 3.2[mW with embodiment A-1], carried out record, evaluation under other condition identical with embodiment A-1.R0 is 17.4, has shone erase power Pe=3.2[mW 1 time] laser after R1 be 17.4 (R1/R0=1.000).
Initial characteristic and regenerative recording characteristic are as shown in table 1, and DOW0 is dithered as 9.8%, and DOW1 is dithered as 11.1%, and DOW9 is dithered as 10.8%, and shake has surpassed 10% in DOW1 and DOW9, and recording characteristic worsens.
(Comparative examples A-6)
With the optical recording media A identical, except erase power Pe is changed to 6.8[mW with embodiment A-1], other and embodiment A-1 similarly carried out record, evaluation.R0 is 17.4, has shone erase power Pe=6.8[mW 1 time] laser after R1 be 18.2 (R1/R0=1.046).
Initial characteristic and regenerative recording characteristic are as shown in table 1, and the DOW0 shake is 8.8%, and the DOW1 shake is 12.3%, the shake of DOW9 is 9.8%, moreover, though not record, DOW10000 is dithered as 14.4%, and shake has surpassed in DOW1 and DOW10000 influences 10% of error rate, and recording characteristic worsens.
Distinguish according to above, establish from LD 33 on recording areas 54 once also the not recording portion of recorded information irradiation again during used laser, the reflectivity of recording portion is not R0, after recording portion has not been shone the laser that has erase power Pe for 1 time from LD 33 irradiation again during used laser, the reflectivity of recording portion is not R1, if adopt the optimum erase power Pel of the relation establishment that makes following (1) formula to carry out optical recording as erase power Pe, then shake below 10%, more satisfactory.
1.000＜(R1/R0)＜1.030…(1)
Moreover also distinguish, if erase power Pe greater than the optimum erase power Pel that satisfies (1) formula the DOW10000 shake worsen, if less than the DOW1 shake worsen.This is because under the big situation of erase power Pe, the load that layer structure carries out on the recording layer in the phase-change optical recording medium of reversible variation is excessive, the segregation of the composition of occurrence record layer easily; And under the little situation of erase power Pe, the mark that forms before can not wiping fully.
As mentioned above, determined the bound of erase power Pe with the relation that rewrites characteristic.Following tendency is generally arranged: increase erase power Pe more, then reflectivity R1 is big more.That is, be in following proportionate relationship: increase erase power Pe more, then R1/R0 is big more.The inventor finds according to the experimental result shown in this relation and the table 1, need make R1/R0 satisfy above-mentioned (1) formula.
Here, illustrate under the situation of 3 values of in the storer 451 of optical recorder shown in Figure 6, not preserving above-mentioned the best, utilize reflectivity test section 46 to ask the method for three values.
At first, be the playback light of Pr from shaven head 34 to optical recording media A irradiating laser power, detect R0 with reflectivity test section 46 according to reproducing signal from the not shown four segmented sense optical elements supply of shaven head 34.Then, the laser of the erase power Pe of irradiation regulation detects R1 equally.The details of R0, R1 as mentioned above.Here, storer 451 has three values of regulation in advance, but they are not three values of the intrinsic the best of optical recording media.Reflectivity test section 46 is asked R1/R0 according to detected R0, R1.
Example as the method for detection of reflected rate waits detection of reflected rate R0 and R1 with reflectivity test section 46 by magnitude of voltage, and the magnitude of voltage of establishing R0 is scaled V0, and the magnitude of voltage of R1 is scaled V1, calculates V1/V0, is R1/R0 with reflectivity test section 46.
Under the situation of R1/R0 value greater than (1) formula that reflectivity test section 46 is calculated, system controller 45 control Pe drive current source 431e are so that reduce erase power Pe.Under the situation less than (1) formula, system controller 45 control Pe drive current source 431e are so that increase erase power Pe.
Like this, reflectivity test section 46 is asked a plurality of R1s corresponding with a plurality of erase power Pe and the R1/R0 of each R1, selects to satisfy R1 of (1) formula and the combination of R0.The erase power Pe of the combination of R1 that realization is selected and R0 stores in the storer 451 as optimum erase power Pel then.Wherein, will ask optimum erase power Pel to be called self-optimizing like this.
The discussion of＜best initialization condition 〉
Then, the inventor estimates that the initialization condition in the apparatus for initializing 200 may influence the record of optical recording media and rewrite characteristic, find that according to following Embodiment B-1～B-5 and comparative example B-6～B-8 this estimation is correct, have to make record and rewrite characteristic to reach best initialization condition.
Relation between the R0 of optical recording media A after initialization laser power density Di and the initialization as shown in Figure 7.So-called initialization laser power density Di, the laser power that is the laser that uses in the initialization is divided by the irradiated area of initialization laser, again divided by the value of the sweep velocity gained of initialization laser.Reflectivity R0 is the average reflectance in record 1 week of channel.
The initialization laser power density Di of zone A is low, and residual amorphous portion (As-depo) after the sputter is so the non-constant of the jittering characteristic of DOW0 is undesirable.
If improve initialization laser power density Di than regional A, then amorphous portion disappears, and becomes the fewer area B of reflectance varies.If further improve initialization laser power density Di, then be changed to the big zone C of reflectance varies, region D and even CD bad block that reflectance varies is few.On the CD bad block, the laser power of connecting during initialization is excessive, so on the layer that with the recording layer is the center physical damage that heat causes takes place.
(Embodiment B-1)
Made the optical recording media A identical with embodiment A-1.Same with embodiment A-1, be that 4.5m/s, laser power are that 1600mW, pitch of feed are initialization power density D i=1.42[mWs/ (the μ m that has carried out recording layer 3 under the initialization condition of 220 μ m in sweep trace speed
2M)], initialization back reflection rate zone=BH).
Except R0, the R1 of definition as mentioned above, after recording portion has not been shone the laser that has erase power Pe for 10 times from LD 33 irradiation again during used laser, the reflectivity of recording portion is not made as under the situation of R10, poor (R10/R0)-(R1/R0) of luminance factor is 0.092.The value of each reflectivity is as shown in table 2.Wherein, the method for detection of reflected rate R10 also can be and above-mentioned same method.
Measure equally with embodiment A-1, initial characteristic and regenerative recording characteristic are as shown in table 2, and the DOW0 shake is 6.5%, and the DOW1 shake is 8.0%, and the DOW9 shake is 7.5%.Moreover though not record, DOW10000 is dithered as 8.5%, even rewrite, characteristic is all-the-time stable also, and recording characteristic is good.
[table 2]
(Embodiment B-2)
Using the optical recording media A identical with Embodiment B-1, is the 1700mW except initialization condition being changed to laser power, and other and Embodiment B-1 have similarly been carried out initialization (initialization power density D i=1.51[mWs/ (the μ m of recording layer 3
2M)], initialization back reflection rate zone=BH).The difference of luminance factor is 0.043.
Carried out the mensuration same with Embodiment B-1, as shown in table 2, recording characteristic is good.
(Embodiment B-3)
Using the optical recording media A identical with Embodiment B-1, is the 1730mW except initialization condition being changed to laser power, and other and Embodiment B-1 have similarly been carried out initialization (initialization power density D i=1.54[mWs/ (the μ m of recording layer 3
2M)], initialization back reflection rate zone=BH).The difference of luminance factor is 0.038.
Carried out the mensuration same with Embodiment B-1, as shown in table 2, recording characteristic is good.
(Embodiment B-4)
Using the optical recording media A identical with Embodiment B-1, is the 1400mW except initialization condition being changed to laser power, and other and Embodiment B-1 have similarly been carried out initialization (initialization power density D i=1.24[mWs/ (the μ m of recording layer 3
2M)], initialization back reflection rate zone=BH).The difference of luminance factor is 0.124.
Carried out the mensuration same with Embodiment B-1, as shown in table 2, recording characteristic is good.
(Embodiment B-5)
Using the optical recording media A identical with Embodiment B-1, is the 1360mW except initialization condition being changed to laser power, and other and Embodiment B-1 have similarly been carried out initialization (initialization power density D i=1.21[mWs/ (the μ m of recording layer 3
2M)], initialization back reflection rate zone=BH).The difference of luminance factor is 0.144.
Carried out the mensuration same with Embodiment B-1, as shown in table 2, recording characteristic is good.
(comparative example B-6)
Using the optical recording media A identical with Embodiment B-1, is the 1300mW except initialization condition being changed to laser power, and other and Embodiment B-1 have similarly been carried out initialization (initialization power density D i=1.16[mWs/ (the μ m of recording layer 3
2M)], initialization back reflection rate zone=BL).The difference of luminance factor is 0.160.
Carried out the mensuration same with Embodiment B-1, as shown in table 2, the DOW1 shake is 11.1%, and the rewriting characteristic of less number of times is bad.
(comparative example B-7)
Use the optical recording media A identical with Embodiment B-1, except initialization condition being changed to sweep trace speed is that 4.0m/s, laser power are the 1600mW, and other and Embodiment B-1 have similarly been carried out initialization (initialization power density D i=1.60[mWs/ (the μ m of recording layer 3
2M)], initialization back reflection rate zone=C).The difference of luminance factor is 0.037.
Carried out the mensuration same with Embodiment B-1, as shown in table 2, DOW0 is dithered as 12.8%, and DOW1 is dithered as 10.8%, and the rewriting characteristic of less number of times is bad.
(comparative example B-8)
Use the optical recording media A identical with Embodiment B-1, except initialization condition being changed to sweep trace speed is that 4.0m/s, laser power are the 1800mW, and other and Embodiment B-1 have similarly been carried out initialization (initialization power density D i=1.80[mWs/ (the μ m of recording layer 3
2M)], initialization back reflection rate zone=C).The difference of luminance factor is 0.010.
Carried out the mensuration same with Embodiment B-1, as shown in table 2, DOW1 is dithered as 16.3%, and the rewriting characteristic of less number of times is bad.
Distinguish according to above, detect R0, R1 and the R10 of definition as described above, it is more satisfactory that the initialization laser power density Di (initialization condition) that uses poor (R10/R0)-(R1/R0) of the luminance factor of calculating according to it to satisfy the relation of (2) formula carries out initialization to optical recording media.Like this, even carry out counting to the rewriting of repeatedly counting, also can keep good characteristic from less time.
0.030＜(R10/R0)-(R1/R0)＜0.150…(2)
Better is,
0.038≤(R10/R0)-(R1/R0)≤0.144…(3)。
The initialization laser power density Di that satisfies above-mentioned (2) formula is in the scope of 1.20≤Di≤1.55 more satisfactory according to table 2, if carry out initialization under this initialization condition, then reflectivity R0 is converged in the area B H shown in Figure 7.
Moreover, being lower than 0.030 or be higher than under 0.150 the initialization condition in the difference of the such luminance factor of comparative example B-6～B-8, the reflectivity regions after the initialization is BL or C, D.In the case, in the scope of 1.20≤Di≤1.55, the rewriting characteristic of less number of times has not worsened initialization laser power density Di yet.In addition, be under the situation of C in the such reflectivity regions of comparative example B-7, there is the zone of BH and D after the initialization simultaneously, so the characteristic of DOW0 also worsens.
Fig. 8 is the number of rewrites (Overwrite:DOW) on expression reflectivity regions B～D and the DOW jittering characteristic figure of the relation between the jitter value.
Based on the initialization laser power density of region D (◆), be under the initialization condition of the laser power of initialization laser and sweep velocity, the shake of DOW0 well, DOW1 shakes non-constant, so undesirable.On region D, the difference of luminance factor is lower than 0.030, does not satisfy (2) formula.
Under the initialization condition of zone C (●), the two mixes region D and area B H, so the initial characteristic instability, as shown in Figure 8, the shake of DOW0 is bad.If rewrite repeatedly, then shake, but when DOW9 (rewriteeing the 9th time), can not obtain good shake, so undesirable with less number of times.In zone C, also same with region D, the difference of luminance factor is lower than 0.030, does not satisfy (2) formula.
As shown in Figure 7, on area B, along with the increase of initialization laser power density Di, reflectivity R0 steadily increases.Here, further being divided into the area B L of antiradar reflectivity side, the area B H of high reflectance side describes.In Fig. 8, the DOW jittering characteristic on the area B L () be DOW0 shake well, but DOW1 shakes non-constant, so undesirable.On area B L, the difference of luminance factor surpasses 0.150, does not satisfy (2) formula.
On the other hand, on area B H (△), can access good DOW jittering characteristic shown in Figure 8, so be optimal initialization condition.Moreover, on area B H, satisfy the relation of (2) formula.
The good reason of this characteristic is considered to, when record by applying the crystalline state that optimum erase power Pel forms, the init state of the area B H that forms with apparatus for initializing 200 is roughly the same.
If Di, then can not shine the required enough laser powers of crystallization of recording layer less than the initialization laser power density Di of the initialization condition that satisfies area B H, residual have an amorphous portion, and reflectivity becomes regional A or the BL among Fig. 7, DOW characteristic degradation.Moreover the difference of luminance factor surpasses 0.300 on regional A, does not satisfy (2) formula.On the other hand, even Di is big, amorphous portion is also very few, so become zone C, D, perhaps becomes the CD bad block when high initialization laser power density Di, and the DOW characteristic worsens as mentioned above, and is undesirable.
According to more than, in order to satisfy the initialization condition of area B H, initialization laser power density Di is that 1.20≤Di≤1.55 are more satisfactory.
As known from Table 2, by initialization condition being made as area B H, also satisfy aforementioned (1) formula.This be because, as mentioned above, when record by applying the crystalline state that optimum erase power Pel forms, the init state of the area B H that forms with apparatus for initializing 200 is roughly the same.
Wherein, for the preferred example of the condition of above-mentioned to satisfy (1), (2) formula, be that initialization laser power density Di (1.20≤Di≤1.55) has carried out initialized optical recording media, adopt the optimum erase power that above-mentioned (1) formula is set up better.
＜best power is than the discussion of ε 〉
Best titime condition when recording light recording medium A further being discussed according to Embodiment C-1～C-3 and comparative example C-4, C-5.
The DOW jittering characteristic of optical recording media is according to the power ratio ε of recording power Pw and erase power Pe=(Pe/Pw) change.Relation between shake when Fig. 9 illustrates DOW1 and the power ratio ε.Shaking minimum, good is near ε=0.30, is the end near 0.30, no matter power ratio ε is little still big, shake is all risen.Wherein, according to Fig. 9, present be considered to the few shake below 10% of the harmful effect of error rate be ε=0.20～0.40, so the scope of desirable power ratio ε is 0.20≤ε≤0.40.
Under the situation of ε＜0.20, recording power Pw so be difficult to form enough big record mark, consequently can not obtain enough signal intensities less than erase power Pe.Under the situation of ε＞0.40, recording power Pw is excessively greater than erase power Pe, thus cross erasing is arranged, thus characteristics of signals worsens, and undesirable.
(Embodiment C-1～Embodiment C-3)
Made the optical recording media A identical with embodiment A-1.Initialization condition identical with embodiment A-1 (sweep trace speed is 4.5m/s, and laser power is 1600mW, and pitch of feed is 220 μ m), the erase power Pe that makes when record and each embodiment A are equally at 3.8～5.6[mW] scope in variation.In addition, recording power Pw is also changed in each Embodiment C, with power ratio ε (=Pe/Pw) be set at 0.21～0.39.Each value is as shown in table 3.
Carried out the mensuration same with embodiment A-1, the initial characteristic of each Embodiment C and regenerative recording characteristic are as shown in table 3, the DOW0 shake is 6.5%～7.0% value, the DOW1 shake is 8.0%～9.1% value, the DOW9 shake is 7.5%～8.4% value, and DOW10000 is dithered as 8.0%～9.8%, even rewrite, characteristic is also stable, and recording characteristic is good.
[table 3]
(comparative example C-4)
Made the optical recording media A identical with embodiment A-1.In addition, under the initialization condition identical, carried out the initialization of recording layer 3 with embodiment A-1.In record condition,, carried out the mensuration same with embodiment A-1 except recording power Pw being changed to 13.0mW, erase power Pe being changed to 5.8mW, power ratio ε is made as 0.45.As shown in table 3, shake rewrites the non-constant of characteristic more than 13.2% during the later rewriting of DOW1.
(comparative example C-5)
Made the optical recording media A identical with embodiment A-1.In addition, under the initialization condition identical, carried out the initialization of recording layer 3 with embodiment A-1.In record condition,, carried out the mensuration same with embodiment A-1 except recording power Pw being changed to 21.0mW, erase power Pe being changed to 3.8mW, power ratio ε is made as 0.18.As shown in table 3, DOW1 is dithered as 12.2%, and DOW10000 is dithered as 12.4%, rewrites the non-constant of characteristic.
Distinguishing according to above each Embodiment C, each comparative example C and Fig. 9, is 0.20≤ε≤0.40 as the power ratio ε ideal range of record condition.
Figure 10 is the DOW jittering characteristic figure of the relation of expression shake and DOW number.In Figure 10, to show power ratio ε be 0.3, than 0.2 little 0.15 and bigger by 0.45 than 0.4.Power ratio ε less than 0.20 situation under, erase power Pe is excessively less than recording power Pw, so the mark of describing before can not fully wiping.Therefore, shown in the ◇ of Figure 10, the jittering characteristic of DOW1 is bad, so undesirable.On the other hand, power ratio ε is than under the 0.40 big situation, and erase power Pe is excessively greater than recording power Pw, so the crystalline state instability, as Figure 10 zero shown in, the shake of DOW1 is poor, so undesirable.
As can be known, be under 0.30 the situation (△) at power ratio ε shown in Figure 10, the value that shake is all being got when several below 10% for any DOW time.According to more than, in order to obtain the shake below 10%, the power ratio ε that is in the scope of 0.20≤ε≤0.40 is more satisfactory.
Shown in Figure 10 (◇), the later jittering characteristic of DOW1 is bad, so undesirable.On the other hand, power ratio ε greater than 0.40 situation under, erase power Pe is excessively greater than recording power Pw, so the crystalline state instability, shown in Figure 10 (zero), the jittering characteristic of DOW1 is bad, so undesirable.Power ratio ε is in the scope of 0.20≤ε≤0.40 more satisfactory.
With the power ratio ε in the above-mentioned scope that is in more than 0.20, below 0.40 as best power than ε l, ε l is recorded in advance the Lead-In Area 53 of optical recording media A shown in Figure 3.Optical recorder reads above-mentioned optimum erase power Pel and best power than best titime information such as ε l from Lead-In Area 53, carries out record according to information.In addition, also can be with carrying out record in advance or by the best titime information that renewal is preserved in the storer 451 in the system controller 45 of optical recorder.
Here, can ask optimal recording power Pwl than ε l according to optimum erase power Pel and best power.Optimal recording power Pwl also can be contained in the best titime information.
The discussion of＜power ratio ε 〉
In the present embodiment, following recording power Pw, erase power Pe and the power ratio ε that has set on each line speed record (wipes/record: Pe/Pw).If the recording power on the low linear velocity is that Pwl, erase power are Pel, recording power on the middle linear velocity is that Pwm, erase power are Pem, recording power on the high linear speed is that Pwh, erase power are Peh, the power ratio of establishing low linear velocity, middle linear velocity, high linear speed be respectively ε l (=Pel/Pwl), ε m (=Pem/Pwm), ε h (=Peh/Pwh).
Here, so-called high linear speed, middle linear velocity, low linear velocity, expression recoding/reproduction or to wipe with laser be respectively high speed, middling speed, low speed to the relative scanning speed V of optical recording media, establishing under the situation that each sweep velocity is Vh (at a high speed), Vm (middling speed), Vl (low speed) Vl＜Vm＜Vh.
For example under the situation of CLV (constant linear velocity) record, can adopt the doubly doubly doubly combination of speed of speed, Vl=1 of speed, Vm=2 of Vh=4, perhaps adopt the doubly doubly doubly combination of speed of speed, Vl=2 of speed, Vm=4 of Vh=6.In addition, under the situation of CAV (Constant Angular Velocity) record, be the difference of the scan velocity V that causes of the position difference radially between interior week and the most peripheral, on interior week, be Vl for example, on most peripheral Vh, on the radius betwixt the Vm of optional position.
The inventor estimates, for the record that makes optical recording media A and to rewrite characteristic good, the magnitude relationship of power ratio ε on each line speed record (ε l, ε m, ε h) is made as the relation different with patent documentation 5 may be more satisfactory, find according to following embodiment D-1～D-3 and Comparative Example D-4～D-8, this estimation is correct, has to make record and rewrite the relation that characteristic reaches best power ratio ε.
(embodiment D-1)
With above-mentioned optical recording media A, from the groove of the plane of incidence 1a side direction recording layer 3 of substrate 1, carried out record.
If line speed record is 3.5m/s (being equivalent to 1 times of speed of dvd standard) when low linear velocity writes down, it when the center line speed record 7.0m/s (being equivalent to 2 times of speed of dvd standard), be 14.0m/s (being equivalent to 4 times of speed of dvd standard) when high linear speed writes down, estimate with 8-16 modulated random pattern.The unit clock time T is 38.2ns when low linear velocity (1x), is 19.1ns when middle linear velocity (2x), is 9.6ns when high linear speed (4x).
As the recording impulse pattern of record condition, on low linear velocity, be to be Ttop=0.3[T on the line speed record 3.5m/s], Tmp=0.4[T], Tcl=1.3[T].In addition, the laser intensity of laser has adopted recording power Pw (Pwl)=14.1[mW], erase power Pe (Pel)=7.2[mW], lowest power Pb=0.5[mW] this three value (ε l=0.51).
On the middle linear velocity, be on the line speed record 7.0m/s, adopted Ttop=0.4[T], Tmp=0.4[T], Tcl=0.9[T], adopted recording power Pw (PWm)=16.2[mW], erase power Pe (Pem)=7.6[mW], lowest power Pb=0.5[mW] (ε m=0.47).
On the high linear speed, be on the line speed record 14.0m/s, adopted Ttop=0.6[T], Tmp=0.5[T], Tcl=0.0[T], adopted recording power Pw (Pwh)=17.2[mW], erase power Pe (Peh)=4.6[mW], lowest power Pb=0.5[mW] (ε h=0.27).
Wherein, the relation of the power ratio of present embodiment D-1 is ε h＜ε m＜ε l.
The recording characteristic of present embodiment D-1 is as shown in table 4.Wherein, following each embodiment D and each Comparative Example D are also as shown in table 4.In addition, in following each embodiment D and each Comparative Example D, low linear velocity all is 1 times of speed of dvd standard (1x), and middle linear velocity all is 2 times of speed of dvd standard (2x), and high linear speed all is 4 times of speed of dvd standard (4x).
[table 4]
Rewriteeing the shake of the 9th time (Direct Over Write:DOW9), is 7.3% on low linear velocity (1x), is 7.1% on middle linear velocity (2x), and (4x) is 7.8% on high linear speed, all is lower than 10% on all line speed records, good.The shake that rewrites back (DOW1000) as 1000 times that rewrite characteristic is 7.5% on 1x, be 7.4% on 2x, be 8.2% on 4x, well, reflectivity also is respectively 21.5%, 21.3%, 20.2%, reflectivity Characteristics also good (table 4 shows the reflectivity of the DOW1000 of 4x (high linear speed)).
Wherein, with jittering characteristic not to error rate cause dysgenic shake, promptly 10% as benchmark, think good under its situation being lower than, think bad being higher than under its situation.Consider the ROM compatibility of DVD player etc., reflectivity is good with the value more than 16%.
The best power of optical recording media than ε (ε h, ε m, ε l) sometimes according to the composition of recording layer 3 and change slightly.Therefore, the checking of carrying out under different the composition shows appropriate property of the present invention.
(embodiment D-2)
Present embodiment has adopted the optical recording media with the identical structure of embodiment D-1 except the composition with recording layer 3 changes to the plain single alloys target of Ga-Sb-In-Sn quaternary.In addition, record condition on each line speed record, on 1x, adopted recording power Pwl=15.5[mW], erase power Pel=5.0[mW] (ε l=0.32), on 2x, adopted recording power Pwm=17.0[mW], erase power Pem=4.3[mW] (ε m=0.25), on 4x, adopted recording power Pwh=18.5[mW], erase power Peh=3.7[mW] (ε h=0.20) (ε h＜ε m＜ε l).Other record conditions adopt the condition identical with embodiment D-1, have measured recording characteristic.
As shown in table 4, the shake of DOW9 is 7.9% on 1x, is 7.6% on 2x, is 8.0% on 4x, all is lower than 10% on institute's wire speed, and is good.It is good too to rewrite characteristic.
(embodiment D-3)
Present embodiment has adopted the optical recording media with the identical structure of embodiment D-1 except the composition with recording layer 3 changes to the plain single alloys target of Ag-In-Sb-Te quaternary.In addition, record condition on each line speed record, on 1x, adopted recording power Pwl=14.0[mW], erase power Pel=9.8[mW] (ε l=0.70), on 2x, adopted recording power Pwm=16.0[mW], erase power Pem=9.6[mW] (ε m=0.60), on 4x, adopted recording power Pwh=17.8[mW], erase power Peh=7.1[mW] (ε h=0.40) (ε h＜ε m＜ε l).Other record conditions adopt the condition identical with embodiment D-1, have measured recording characteristic.
As shown in table 4, the shake of DOW9 is 8.2% on 1x, is 8.0% on 2x, is 8.0% on 4x, all is lower than 10% on institute's wire speed, and is good.It is good too to rewrite characteristic.
(Comparative Example D-4)
In addition, adopted identical condition except changing to ε m=0.25 (Pem=4.1mW, ε m＜ε h＜ε l) with embodiment D-1.Carried out the mensuration same with embodiment D-1, as shown in table 4, the DOW9 shake on 1x, the 4x is identical with embodiment D-1, but is dithered as 25.5% on 2x, and severe exacerbation can not obtain good jittering characteristic.This is because because the ε h=0.27 of the power ratio ε m=0.25 when making 2x (middle linear velocity) during less than 4x (high linear speed), thereby the erase power on the middle linear velocity is not enough, wipes unclean.
(Comparative Example D-5)
In addition, adopted identical condition except changing to ε l=0.25 (Pel=3.5mW, ε l＜ε h＜ε m) with embodiment D-1.Carried out the mensuration same with embodiment D-1, as shown in table 4, the DOW9 shake on 2x, the 4x is identical with embodiment D-1, but is dithered as 25.5% on 1x, and severe exacerbation can not obtain good jittering characteristic.This is because because the ε h=0.27 of the power ratio ε l=0.25 when making 1x (low linear velocity) during less than 4x (high linear speed), thereby the erase power on the low linear velocity is not enough, wipes unclean.
(Comparative Example D-6)
In addition, adopted identical condition except changing to ε l=0.35 (Pel=4.9mW, ε h＜ε l＜ε m) with embodiment D-1.Carried out the mensuration same with embodiment D-1, as shown in table 4, DOW9 on 2x, 4x shake is identical with embodiment D-1, but is dithered as 11.1% on the 1x, has worsened, and can not obtain good jittering characteristic.This is because because the ε m=0.47 of the power ratio ε l=0.35 when making 1x (low linear velocity) during less than 2x (middle linear velocity), thereby the erase power on the low linear velocity is not enough, wipes unclean.
(Comparative Example D-7)
In addition, adopted identical condition except changing to ε h=0.60 (Peh=10.3mW, ε m＜ε l＜ε h) with embodiment D-1.Carried out the mensuration same with embodiment D-1, as shown in table 4, DOW9 on 1x, 2x shake is identical with embodiment D-1, but is dithered as 13.8% on the 4x, has worsened, and can not obtain good jittering characteristic.In addition, the reflectivity of the DOW1000 on the 4x is 14.3%, reduces a lot, and rewriting can not obtain good characteristic.Its reason is exceedingly to have applied erase power owing to increased ε h when 4x (high linear speed) writes down, so the supercooling of recording layer 3 has caused the deterioration of crystalline state.
(Comparative Example D-8)
In addition, adopted identical condition except changing to ε l=0.35, ε h=0.50 (Pel=4.9mW, Peh=8.6mW, ε l＜ε m＜ε h) with embodiment D-1.Carried out the mensuration same with embodiment D-1, as shown in table 4, the DOW9 shake on the 2x is identical with embodiment D-1, but is 11.1% on 1x, is dithered as 13.0% on 4x, has worsened, and can not obtain good jittering characteristic.In addition, the reflectivity of the DOW1000 on the 4x is reduced to 16.8%, can not obtain good rewriting characteristic.Its reason is exceedingly to have applied erase power owing to increased ε h when 4x (high linear speed) writes down, so the supercooling of recording layer 3 has caused the deterioration of crystalline state.
According to above result, Figure 11 illustrates the relation of the DOW9 shake on each line speed record of embodiment D-1 and Comparative Example D-4～D-8.Wherein, remaining not shown embodiment D-2 is later on also as reading from table 4, and on all line speed records, DOW9 shakes below 10%.
Distinguish according to table 4 and Figure 11, satisfy at the power ratio ε on each line speed record under the situation of relation of following (4) formula, can obtain good record and rewrite characteristic.
εh＜εm＜εl …(4)
Moreover, the inventor finds according to embodiment E-1～E-3 and Comparative Example E-4～E-8, under the different situation of the combination of in line speed record and the foregoing description D-1～D-3 and Comparative Example D-4～D-8, discussing (1x, 2x, 4x), also can in the relation of the power ratio ε on each line speed record shown in above-mentioned (4) formula, obtain the best record of optical recording media and rewrite characteristic.Wherein, make the composition of recording layer 3 also different and discuss with the various embodiments described above D and each comparative example.
In following all each embodiment E and each Comparative Example E, low linear velocity all is 2 times of speed of dvd standard (2x), and middle linear velocity all is 4 times of speed of dvd standard (4x), and high linear speed all is 6 times of speed of dvd standard (6x).
(embodiment E-1)
Made and made except the Sb amount that increases recording layer 3 that crystallization rate increases such change, other optical recording media identical with embodiment D-1.In addition, line speed record is, when low linear velocity writes down is 7.0m/s (being equivalent to 2 times of speed of dvd standard), it when the center line speed record 14.0m/s (being equivalent to 4 times of speed of dvd standard), be 21.0ms (being equivalent to 6 times of speed of dvd standard) when high linear speed writes down, carried out the record-playback evaluation with 8-16 (EFM+) modulated random pattern.The unit clock time T is 19.1ns at 2 times when fast, is 9.6ns at 4 times when fast, is 6.4ns at 6 times when fast.Bit length, reproducing power Pr, and the record assay method as mentioned above.
In addition, Write strategy has adopted the editing pulse sequence of Fig. 4 under the situation of low linear velocity (2x) and middle linear velocity (4x), and has adopted the editing pulse sequence of Fig. 5 under the situation of high linear speed (6x).Wherein, optical recorder has also adopted the device identical with the foregoing description D.
As the recording impulse pattern of record condition, be on the line speed record 7.0m/s in low linear velocity, adopted recording power Pwl=16.1[mW], erase power Pel=8.0[mW], lowest power Pb=0.5[mW] (ε l=0.50).
In middle linear velocity is on the line speed record 14.0m/s, has adopted recording power Pwm=17.2[mW], erase power Pem=7.2[mW], lowest power Pb=0.5[mW] (ε m=0.42).
At high linear speed is on the line speed record 21.0m/s, has adopted recording power Pwh=20.0[mW], erase power Peh=5.8[mW], lowest power Pb=0.5[mW] (ε h=0.29) (ε h＜ε m＜ε l:(4) formula).
The recording characteristic of present embodiment E-1 is as shown in table 5.Wherein, following examples E-2, E-3 and each Comparative Example E-4～E-8 are as shown in table 5 too.
[table 5]
The shake of DOW9 is 7.5% on low linear velocity (2x) respectively, is 7.4% on middle linear velocity (4x), is 8.1% on high linear speed (6x), all is lower than 10% on institute's wire speed, and is good.The rewriting characteristic is, shake during DOW10000 is respectively 7.9% on 2x, be 7.9% on 4x, be 9.2% on 6x, well, reflectivity also is respectively 20.5%, 20.2%, 19.6%, and reflectivity Characteristics is good (reflectivity of the DOW1000 when only showing 6x (high linear speed) in table 5) also.
(embodiment E-2)
Made and made except the Sb amount that increases recording layer 3 that crystallization rate increases such change, other and the same optical recording media of embodiment D-2.In addition, record condition on each line speed record is, on 2x, adopted recording power Pwl=18.0[mW], erase power Pel=5.4[mW] (ε l=0.30), on 4x, adopted recording power Pwm=20.0[mW], erase power Pem=5.0[mW] (ε m=0.25), on 6x, adopted recording power Pwh=22.0[mW], erase power Peh=4.4[mW] (ε h=0.20) (ε h＜ε m＜ε l:(4) formula).Other record conditions adopt the condition identical with embodiment E-1, have measured recording characteristic.
As shown in table 5, the DOW9 shake is 8.3% on 2x, is 8.0% on 4x, is 8.6% on 6x, all is lower than 10% on institute's wire speed, and is good.It is good too to rewrite characteristic.
(embodiment E-3)
Made and made except the Sb amount that increases recording layer 3 that crystallization rate increases such change, other and the same optical recording media of embodiment D-3.In addition, record condition on each line speed record is, on 2x, adopted recording power Pwl=18.0[mW], erase power Pel=10.8[mW] (ε l=0.60), on 4x, adopted recording power Pwm=21.0[mW], erase power Pem=10.5[nW] (ε m=0.50), on 6x, adopted recording power Pwh=23.0[mW], erase power Peh=9.2[mW] (ε h=0.40) (ε h＜ε m＜ε l:(4) formula).Other record condition adopts the condition identical with embodiment E-1, has measured recording characteristic.
As shown in table 5, the DOW9 shake is 8.0% on 2x, is 7.6% on 4x, is 8.6% on 6x, all is lower than 10% on institute's wire speed, and is good.It is good too to rewrite characteristic.
(Comparative Example E-4)
Adopted except change to ε m=0.25 (Pem=4.3mW, ε m＜ε h) in addition, other and the identical condition of embodiment E-1.Carried out the mensuration same with embodiment E-1, as shown in table 5, the DOW9 shake on 2x, the 6x is identical with embodiment E-1, but is dithered as 25.1% on 4x, and severe exacerbation can not obtain good jittering characteristic.This is because owing to make the ε h=0.29 of the power ratio ε m=0.25 of 4x (middle linear velocity) less than 6x (high linear speed), thereby the erase power on the middle linear velocity is not enough, wipes unclean.
(Comparative Example E-5)
Adopted except change to ε l=0.25 (Pel=4.0mW, ε l＜ε h) in addition, other and the identical condition of embodiment E-1.Carried out the mensuration same with embodiment E-1, as shown in table 5, the DOW9 shake on 4x, the 6x is identical with embodiment E-1, but is dithered as 24.3% on 2x, and severe exacerbation can not obtain good jittering characteristic.This is because owing to the ε h=0.29 of the power ratio ε l=0.25 that makes 2x (low linear velocity) less than 6x (high linear speed), thereby the erase power on the low linear velocity is not enough, wipes unclean.
(Comparative Example E-6)
Adopted except change to ε l=0.35 (Pel=5.6mW, ε m＞ε l＞ε h) in addition, other and the identical condition of embodiment E-1.Carried out the mensuration same with embodiment E-1, as shown in table 5, the DOW9 shake on 4x, the 6x is identical with embodiment E-1, but is dithered as 14.6% on 2x, has worsened, and can not obtain good jittering characteristic.This is because owing to the ε m=0.42 of the power ratio ε l=0.35 that makes 2x (low linear velocity) less than 4x (middle linear velocity), thereby the erase power on the low linear velocity is not enough, wipes unclean.
(Comparative Example E-7)
Adopted except change to ε h=0.60 (Peh=12.0mW, ε m＜ε l＜ε h) in addition, other and the identical condition of embodiment E-1.Carried out the mensuration same with embodiment E-1, as shown in table 5, the DOW9 shake on 2x, the 4x is identical with embodiment E-1, but is dithered as 16.2% on 6x, has worsened, and can not obtain good jittering characteristic.In addition, the reflectivity of DOW1000 is 14.2%, reduces very much, and rewriting can not obtain good characteristic.Its reason is exceedingly to have applied erase power owing to increased ε h when 6x (high linear speed) writes down, so the supercooling of recording layer 3 has caused the deterioration of crystalline state.
(Comparative Example E-8)
Adopted except change to ε l=0.35, ε h=0.50 (Pel=5.6mW, Peh=10.0mW, ε l＜ε m＜ε h) in addition, other and the identical condition of embodiment E-1.Carried out the mensuration same with embodiment E-1, as shown in table 5, the DOW9 shake on the 4x is identical with embodiment E-1, but is 14.6% on 2x, is 14.1% on 6x, has worsened, and can not obtain good jittering characteristic.In addition, the reflectivity of the DOW1000 on the 6x is reduced to 15.3%, can not obtain good rewriting characteristic.Its reason is exceedingly to have applied erase power owing to increased ε h when 6x (high linear speed) writes down, so the supercooling of recording layer 3 has caused the deterioration of crystalline state.
The relation of the DOW9 shake on each line speed record of embodiment E-1 and Comparative Example E-4～E-8 as shown in figure 12.Also distinguish according to table 5 and Figure 12,, then write down and to rewrite characteristic best if the relation of the power ratio on each line speed record satisfies (4) formula.Wherein, also as known from Table 5, on all line speed records, DOW9 shakes below 10% after not shown remaining embodiment E-2.
Distinguish according to above, establishing low linear velocity is that 1 times of speed, high linear speed are the embodiment D-1～D-3 and the Comparative Example D-4～D-8 of 4 times of speed and to establish low linear velocity be that 2 times of speed, high linear speed are in the embodiment E-1～E-3 of 6 times of speed and among Comparative Example E-4～E-8 any, if power ratio ε satisfies the relation of (4) formula, then optical recording media can both obtain best record and rewrite characteristic.Moreover, distinguish that also the relation of (4) formula is not subjected to the composition of recording layer 3 of optical recording media or the influence of tidemark linear velocity.
As can be known, increase and satisfy under the situation of relation of (4) formula in the order that power ratio ε presses high linear speed ε h, middle linear velocity ε m, low linear velocity ε l, the DOW9 shake is all good on any line speed record.
Under the situation of the power ratio of linear velocity less than the power ratio (ε m＜ε h) of high linear speed, erase power Peh is too high in the high linear speed record in making, and answers the part generation of crystallization decrystallized, and characteristic worsens than first recording characteristic, so undesirable.In addition, even adjust the composition of recording layer 3 so that do not produce decrystallizedly, erase power Peh is also high, so the reflectivity when DOW1000 takes place reduces, recording characteristic worsens, so undesirable.
Under the situation of power ratio less than the power ratio (ε l＜ε m) of middle linear velocity that makes low linear velocity, erase power Pel deficiency on low linear velocity so wiping is unclean, rewrites characteristic degradation, and is undesirable.
According to more than, the power ratio ε of each line speed record does not rely on the composition or the maximum recording rate of recording layer 3, the relation of (4) formula is more satisfactory.
The discussion of the relation of＜power ratio ε l and ε h 〉
Then, the inventor estimates, the power ratio ε l by making low linear velocity and the power ratio ε h of high linear speed are in the relation of regulation, optical recording medium mass-energy obtains good record and rewrites characteristic, find that according to embodiment F-1～F-5 and Comparative Example F-6～F-11 this estimation is correct, have the relation between power ratio ε l and the ε h.Here, the factor alpha of ε h/ ε l=α as index, has been obtained relation.Wherein, in all embodiment F and Comparative Example F, power ratio satisfies the relation of (4) formula.
(embodiment F-1)
Present embodiment has adopted and the identical condition of embodiment D-1 (ε h=0.27 (Peh=4.6mW, factor alpha=0.529)).Similarly measured the i.e. recording characteristic on 4 times of speed (4x) of high linear speed with embodiment D-1, as shown in table 6, shake is 6.2% when DOW0, being 7.8% when DOW1, is 7.8% when DOW9, good respectively, moreover DOW1000 is dithered as 8.2%, reflectivity is 20.2%, does not reduce good (reflectivity of the DOW1000 on the 4x only is shown in table 6).
Wherein, following examples F-2～F-5 and Comparative Example F-6～F-11 are shown too in table 6.
[table 6]
(embodiment F-2)
Adopted except change to ε h=0.23 (Peh=4.0mW, α=0.451) in addition, other condition identical with embodiment F-1.Similarly measured the recording characteristic on the 4x with embodiment F-1, as shown in table 6, from DOW0 to DOW9, shake is good, moreover the reflectivity of DOW1000 also is 19.5%, does not reduce, and is good.
(embodiment F-3)
Adopted except change to ε h=0.40 (Peh=6.9mW, α=0.784) in addition, other condition identical with embodiment F-1.Similarly measured the recording characteristic on the 4x with embodiment F-1, as shown in table 6, from DOW0 to DOW9, shake is good, moreover the reflectivity of DOW1000 also is 20.7%, does not reduce, and is good.
(embodiment F-4)
Adopted bed thickness except the 1st protective seam 2 that will constitute optical recording media A to change to 50nm and change to ε l=0.40, ε h=0.21 (Peh=3.6mW, α=0.525) in addition, other and the identical condition of embodiment D-1.Similarly measured the recording characteristic on the 4x with embodiment D-1, as shown in table 6, shake is 7.0% when DOW0, is 9.2% when DOW1, be 8.6% when DOW9, jittering characteristic is good, moreover shake also is 8.9% when DOW1000, reflectivity also is 18.3%, does not reduce, and is good.
(embodiment F-5)
In embodiment F-5, adopted bed thickness except the 1st protective seam 2 that will constitute optical recording media A to change to 90nm and change to ε l=0.75, ε h=0.40 (Peh=6.9mW, α=0.533) in addition, other and the identical condition of embodiment D-1.Similarly measured the recording characteristic on the 4x with embodiment D-1, as shown in table 6, shake is 7.2% when DOW0, is 8.8% when DOW1, be 8.4% when DOW9, good, moreover shake also is 9.3% when DOW1000, reflectivity also is 22.6%, does not reduce, and is good.
(embodiment F-6)
Adopted except change to ε h=0.20 (Peh=3.4mW, α=0.392) in addition, other condition identical with embodiment F-1.Similarly measured the recording characteristic on the 4x with embodiment F-1, as shown in table 6, DOW1 is dithered as 12.3%, and DOW9 is dithered as 12.1%, and jittering characteristic is bad.This is because the erase power Peh of high linear speed (4x) is 3.4mW, and is low excessively, so the characteristic degradation that does not totally cause occurred wiping.
(embodiment F-7)
Adopted except change to ε h=0.45 (Peh=7.7mW, α=0.882) in addition, other condition identical with embodiment F-1.Similarly measured the recording characteristic on the 4x with embodiment F-1, as shown in table 6, DOW1 is dithered as 11.3%, and jittering characteristic is bad.This is because the erase power Peh of high linear speed (4x), has worsened so the reflectivity of the DOW1000 of high linear speed is 17.6% up to 7.7mW.
(embodiment F-8)
Adopted except change to ε h=0.15 (Peh=2.6mW, α=0.375) in addition, other condition identical with embodiment F-4.Similarly measured the recording characteristic on the 4x with embodiment F-4, as shown in table 6, DOW0 is dithered as 9.1%, and is good, but DOW1 is dithered as 15.6%, and jittering characteristic is bad.
(embodiment F-9)
Adopted except change to ε h=0.34 (Peh=5.8mW, α=0.850) in addition, other condition identical with embodiment F-4.Similarly measured the recording characteristic on the 4x with embodiment F-4, as shown in table 6, DOW0 is dithered as 8.4%, and is good, but DOW1 is dithered as 13.2%, and jittering characteristic is bad.
(embodiment F-10)
Adopted except change to ε h=0.27 (Peh=4.6mW, α=0.360) in addition, other condition identical with embodiment F-5.Measured the recording characteristic on the 4x equally with embodiment F-5, as shown in table 6, DOW0 is dithered as 9.2%, and is good, but DOW1 is dithered as 14.8%, and jittering characteristic is bad.
(embodiment F-11)
Adopted except change to ε h=0.65 (Peh=11.2mW, α=0.867) in addition, other condition identical with embodiment F-5.Measured the recording characteristic on the 4x equally with embodiment F-5, as shown in table 6, DOW0 is dithered as 8.8%, and is good, but DOW1 is dithered as 12.2%, and jittering characteristic is bad.
DOW1 shake on the 4x of above embodiment F-1～F-5 and Comparative Example F-6～F-11 and the relation between the factor alpha are as shown in figure 13.Distinguish that the DOW1 shake becomes the relation of following (5) formula in the scope of the α below 10%.No matter the value of α is more excessive or too small than (5) formula,, all can not obtain good DOW1 shake promptly no matter the value of the power ratio ε h of high linear speed is excessive or too small.
0.45＜α＜0.80 …(5)
Moreover, the inventor finds according to embodiment G-1～G-5 and comparative example G-6～G-11, under the different situation of the combination of discussing in line speed record and the foregoing description F-1～F-5 and Comparative Example F-6～F-11 (1x, 2x, 4x), the power ratio ε l of low linear velocity and the power ratio ε h of high linear speed also have the record that makes optical recording media and rewrite characteristic and reach best prescribed relationship.With the above-mentioned factor alpha of having obtained equally as index.
In following all embodiment G-1～G-5 and comparative example G-6 and G-11, low linear velocity all is 2 times of speed of dvd standard (2x), and middle linear velocity all is 4 times of speed of dvd standard (4x), and high linear speed all is 6 times of speed of dvd standard (6x).Wherein, in all embodiment G and comparative example G, power ratio all satisfies the relation of (4) formula.
(embodiment G-1)
Adopted and the identical condition of embodiment E-1 (ε h=0.29 (Peh=5.8mW, factor alpha=0.580)).Measured the i.e. recording characteristic on 6 times of speed (6x) of high linear speed equally with embodiment E-1, as shown in table 7, shake is 7.1% when DOW0, being 9.2% when DOW1, is 8.1% when DOW9, good respectively, moreover shake also is 9.2% when DOW1000, reflectivity is 19.6%, does not also reduce, and is good.
Wherein, following examples G-2～G-5 and comparative example G-6～G-11 equally also are shown in table 7.
[table 7]
(embodiment G-2)
Adopted except change to ε h=0.23 (Peh=4.6mW, α=0.460) in addition, other condition identical with embodiment G-1.Measured the recording characteristic on the 6x equally with embodiment G-1, as shown in table 7, DOW0～DOW9 shake is good, moreover the reflectivity of DOW1000 is 17.8%, does not also have big reduction, and is good.
(embodiment G-3)
Adopted except change to ε h=0.39 (Peh=8.0mW, α=0.780) in addition, other condition identical with embodiment G-1.Measured the recording characteristic on the 6x equally with embodiment G-1, as shown in table 7, DOW0～DOW9 shake is good, moreover the reflectivity of DOW1000 is 18.1%, does not also have big reduction, and is good.
(embodiment G-4)
Adopted bed thickness except the 1st protective seam 2 that will constitute optical recording media A to change to 50nm and change to ε l=0.38, ε h=0.22 (Peh=4.4mW, α=0.579) in addition, other and the identical condition of embodiment E-1.Measured the recording characteristic on the 6x equally with embodiment E-1, as shown in table 7, shake is 7.3% when DOW0, is 9.1% when DOW1, be 8.0% when DOW9, good respectively, moreover shake also is 9.1% when DOW1000, reflectivity also is 18.2%, does not reduce, and is good.
(embodiment G-5)
Adopted bed thickness except the 1st protective seam 2 that will constitute optical recording media A to change to 90nm and change to ε l=0.75, ε h=0.38 (Peh=7.6mW, α=0.507) in addition, other and the identical condition of embodiment E-1.Measured the recording characteristic on the 6x equally with embodiment E-1, as shown in table 7, shake is 7.4% when DOW0, is 9.1% when DOW1, be 7.9% when DOW9, good respectively, moreover shake also is 9.9% when DOW1000, reflectivity also is 22.2%, does not reduce, and is good.
(comparative example G-6)
Adopted except change to ε h=0.20 (Peh=4.0mW, α=0.400) in addition, other condition identical with embodiment E-1.Measured the recording characteristic on the 6x equally with embodiment G-1, as shown in table 7, DOW1 is dithered as 12.3%, and DOW9 is dithered as 12.2%, and is bad.This is because the erase power Peh on the high linear speed (6x) is 4.0mW, and is low excessively, so the characteristic degradation that does not totally cause occurred wiping.
(comparative example G-7)
Adopted except change to ε h=0.45 (Peh=9.0mW, α=0.900) in addition, other condition identical with embodiment E-1.Measured the recording characteristic on the 6x equally with embodiment G-1, as shown in table 7, DOW1 is dithered as 13.3%, and DOW9 is dithered as 12.1%, and is bad.In addition, the erase power Peh on the high linear speed (6x) is 9.0mW, and is higher, so the reflectivity of DOW1000 is 13.3%, worsened.
(comparative example G-8)
Adopted except change to ε h=0.15 (Peh=3.0mW, α=0.395) in addition, other condition identical with embodiment G-4.Measured the recording characteristic on the 6x equally with embodiment G-4, as shown in table 7, DOW0 is dithered as 9.8%, and is good, but DOW1 is dithered as 15.3%, and jittering characteristic is bad.
(comparative example G-9)
Except changing to ε h=0.34 (Peh=6.8mW, α=0.895) in addition, other is identical with embodiment G-4.Measured the recording characteristic on the 6x equally with embodiment G-4, as shown in table 7, DOW0 is dithered as 9.5%, and is good, but DOW1 is dithered as 11.1%, bad.
(comparative example G-10)
Adopted except change to ε h=0.28 (Peh=5.6mW, α=0.373) in addition, other condition identical with embodiment G-5.Measured the recording characteristic on the 6x equally with embodiment G-5, as shown in table 7, DOW0 is dithered as 9.7%, and is relatively better, but DOW1 is dithered as 14.2%, bad.
(comparative example G-11)
Adopted except change to ε h=0.61 (Peh=12.2mW, α=0.813) in addition, other condition identical with embodiment G-5.Measured the recording characteristic on the 6x equally with embodiment G-5, as shown in table 7, DOW0 is dithered as 9.8%, and is good, but DOW1 is dithered as 12.3%, bad.
DOW1 shake on the 6x of above embodiment G-1～G-5 and comparative example G-6～G-11 and the relation of α are as shown in figure 14.Distinguish, make the scope of DOW1 shake, in embodiment G-1～G-5 and comparative example G-6～G-11, also become above-mentioned (5) formula at the α below 10%.No matter the value of α is more excessive or too small than (5) formula,, all can not obtain good DOW1 shake promptly no matter the value of the power ratio ε h of high linear speed is excessive or too small.
Distinguish according to above, establishing low linear velocity is that 1 times of speed, high linear speed are the embodiment F-1～F-5 and the Comparative Example F-6～F-11 of 4 times of speed and to establish low linear velocity be that 2 times of speed, high linear speed are in each embodiment G-1～G-5 of 6 times of speed and among comparative example G-6～G-11 any, and optical recording media has the prescribed relationship between the power ratio ε h that can obtain best record and rewrite characteristic, the particularly good power ratio ε l DOW shake, low linear velocity and high linear speed.Distinguish in addition, when representing the ratio ε l/ ε h of ε l and ε h with α, more satisfactory in the scope of formula that factor alpha is in above-mentioned (5).
That is,, need to satisfy (4) formula in order to make the DOW1 shake better.Moreover except satisfying (4) formula, it is more satisfactory also to satisfy (5) formula.
Under the situation of α＜0.45, the erase power Peh on the high linear speed is too small, be difficult to wipe, because wiping is unclean, thus the later shake deterioration of DOW1, so undesirable.In addition, under the situation of 0.80＜α, the erase power Peh on the high linear speed is than higher, and decrystallized in the part generation of answering crystallization, the jittering characteristic of DOW1 worsens, so undesirable.Therefore, good for the record and the rewriting characteristic that make optical recording media, the scope of desirable α is (5) formula.
Moreover, consider that the allowance of the environmental stability and the general record device of medium, jitter value are lower than 9%, 0.55＜α＜0.65 is better.
The discussion of the relation of＜recording power 〉
Then, estimate the recording power Pwm of the recording power Pwl of low linear velocity, middle linear velocity and good record and rewriting characteristic that the magnitude relationship between the high linear speed may influence optical recording media, find according to following embodiment H-1, H-2 and Comparative Example H-3～H-5, this estimation is correct, and recording power has best relation.
(embodiment H-1)
Adopted and the identical condition of embodiment D-1 (Pwl=14.1mW, Pwm=16.2mW, Pwh=17.2mW, Pwl＜Pwm＜Pwh).Carried out the mensuration same with embodiment D-1, as shown in table 8, the DOW9 shake is 7.3% on low linear velocity (1x), on middle linear velocity (2x), be 7.1%, on high linear speed (4x), be 7.8%, good respectively, moreover the degree of modulation (DOW9) of this moment is respectively 60.8%, 64.9%, 65.9%.
Wherein, following examples H-2 and Comparative Example H-3～H-5 are shown too in table 8.
Here, so-called degree of modulation is the size of signal intensity, as shown in figure 15, by (degree of modulation)=(I14/I14H) represent, with the standard value of DVD promptly more than 60% as good benchmark.
[table 8]
(embodiment H-2)
Adopted except change to Pwl=15.2mW, Pwm=15.8mW, Pwh=16.2mW (Pwl＜Pwm＜Pwh), other condition identical with embodiment H-1.Carried out the mensuration same with embodiment H-1, as shown in table 8, DOW9 shake is 7.7% on 1x, is 7.2% on 2x, is 8.0% on 4x, and is good respectively, moreover the degree of modulation of this moment also is respectively 61.1%, 63.9%, 63.2%, good.
(Comparative Example H-3)
Adopted except change to Pwh=15.0mW (Pwl＜Pwh＜Pwm), other condition identical with embodiment H-1.Carried out the mensuration same with embodiment H-1, as shown in table 8, the DOW9 of 4x is dithered as 11.5%, and is poorer than embodiment H-1, moreover this moment degree of modulation be 56.2% also, worsened.
(Comparative Example H-4)
Adopted except change to Pwm=13.0mW (Pwm＜Pwl＜Pwh), other condition identical with embodiment H-1.Carried out the mensuration same with embodiment H-1, as shown in table 8, the DOW9 of 2x is dithered as 12.1%, and is poorer than embodiment H-1, moreover this moment degree of modulation be 52.3% also, worsened.
(Comparative Example H-5)
Adopted except change to Pwl=17.8mW (Pwm＜Pwh＜Pwl), other condition identical with embodiment H-1.Carried out the mensuration same with embodiment H-1, as shown in table 8, the DOW9 of 1x is dithered as 10.9%, and is poorer than embodiment H-1.
Distinguish that according to above if do not improve recording power along with the rising of line speed record, then underpower can not obtain enough signal intensities (=degree of modulation), shake worsens.On the other hand, if carry out record with low linear velocity with high recording power, then excessive laser power density makes the increase of crosstalking, so shake worsens.
Therefore, for the good record that obtains optical recording media and rewrite characteristic, the relation that satisfies high more following (6) formula that then increases recording power more of linear velocity is more satisfactory.
Pwl＜Pwm＜Pwh…(6)
Moreover, the inventor finds according to example I-1, I-2 and Comparative Example I-3～I-5, under combination (1x, 2x, the 4x) different situations of in line speed record and the foregoing description H-1, H-2 and Comparative Example H-3～H-5, discussing, also can in the magnitude relationship of the recording power on each line speed record shown in above-mentioned (6) formula, obtain the best record of optical recording media and rewrite characteristic.
In following all example I and Comparative Example I, low linear velocity is 2 times of speed of dvd standard (2x), and middle linear velocity is that 4 times of speed of dvd standard (4x), high linear speed are 6 times of speed of dvd standard (6x).
(example I-1)
Adopted and the identical condition of embodiment E-1 (Pw1=16.1mW, Pwm=17.2mW, Pwh=20.0mW, Pwl＜Pwm＜Pwh).Carried out the mensuration same with embodiment E-1, as shown in table 9, the DOW9 shake is 7.5% on low linear velocity (2x), on middle linear velocity (4x), be 7.4%, on high linear speed (6x), be 8.1%, well, moreover the degree of modulation of (DOW9) is respectively 61.2%, 63.5%, 62.2% at this moment, and is good.
Wherein, following examples I-2 and example I-3～I-5 are shown too in table 9.
[table 9]
(example I-2)
Adopted except change to Pwl=15.5mW, Pwm=16.4mW, Pwh=18.6mW (Pwl＜Pwrm＜Pwh), other and the same condition of example I-1.Carried out the mensuration same with example I-1, as shown in table 9, DOW9 shake is 8.3% on 2x, is 8.2% on 4x, is 9.2% on 6x, and is good respectively, moreover the degree of modulation of this moment also is respectively 60.3%, 61.9%, 60.1%, good.
(Comparative Example I-3)
Adopted except change to Pwh=16.6mW (Pwl＜Pwh＜Pwm), other condition identical with example I-1.Carried out the mensuration same with example I-1, as shown in table 9, the DOW9 of 6x is dithered as 13.6%, and is poorer than example I-1, moreover this moment degree of modulation be 52.8% also, worsened.
(Comparative Example I-4)
Adopted except change to Pwm=14.0mW (Pwm＜Pwl＜Pwh), other condition identical with example I-1.Carried out the mensuration same with example I-1, as shown in table 9, the DOW9 of 4x is dithered as 12.7%, and is poorer than example I-1, moreover this moment degree of modulation be 52.3% also, worsened.
(Comparative Example I-5)
Adopted except change to Pwl=21.0mW (Pwm＜Pwh＜Pwl), other condition identical with example I-1.Carried out the mensuration same with example I-1, as shown in table 9, the DOW9 of 2x is dithered as 11.2%, and is poorer than example I-1.
Distinguish that according to above the relation of if the recording power on each line speed record satisfies above-mentioned (6) formula, then optical recording medium mass-energy obtains good record and rewrites characteristic.
As mentioned above, distinguish that establishing low linear velocity be that 1 times of speed, high linear speed are embodiment H-1, H-2 and the Comparative Example H-3～H-5 of 4 times of speed or to establish low linear velocity be that 2 times of speed, high linear speed are among example I-1, I-2 and the Comparative Example I-3～I-5 of 6 times of speed any, if do not improve recording power along with the rising of writing speed, underpower then, can not obtain enough signal intensities (=degree of modulation), shake worsens.On the other hand, if carry out record with low linear velocity with high recording power, then excessive laser power density makes the increase of crosstalking, so jitter value worsens.Thus, the relation of high more (6) formula that then increases recording power more of linear velocity is more satisfactory.
If improve constantly line speed record, then the recording power density of unit area reduces, so in order to increase the mark width that can obtain enough tracer signals, increase recording power in the scope about Pwh=Pwl * 1.2～Pwl * 1.4 successively along with writing speed more satisfactory.
Not only phase-change optical recording medium such as above-mentioned DVD-RW we can say that the structure of the phase-change recording medium of super-high density shown in Figure 16 also has same effect.The structure of optical recording media B shown in Figure 16 is, stacked gradually the 1st protective seam 12, recording layer the 13, the 2nd protective seam 14, reflection horizon 15, and substrate 11 on the protective seam 17 that with recoding/reproduction or the plane of incidence 17a that wipes the laser of usefulness is the bottom surface.
Claims (6)
1. an optic recording method is recorded in recorded information on the recording layer of phase-change optical recording medium, it is characterized in that,
Comprise: modulation step, modulate above-mentioned recorded information and generate modulating data;
Mark lengths generates step, generates the mark lengths of expectation according to above-mentioned modulating data; And
Recording step, generate the recording impulse pattern according to above-mentioned mark lengths, and write down the record mark of the above-mentioned recorded information of expression to above-mentioned recording layer irradiation recording light according to above-mentioned recording impulse pattern, wherein, this recording impulse pattern comprises: rises and at the recording power bigger with the recording impulse that forms between than the little lowest power of above-mentioned erase power from erase power than above-mentioned erase power, and the erasing pulse of rising to above-mentioned erase power from above-mentioned lowest power;
Above-mentioned recording step carries out record with the line speed record of selecting to above-mentioned recording layer from the 1st line speed record Vl, the 2nd line speed record Vm and the 3rd line speed record Vh, wherein, and Vl＜Vm＜Vh;
The record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording step, in record that carries out with above-mentioned the 2nd line speed record Vm and the record that carries out with above-mentioned the 3rd line speed record Vh, the 1st erase power Pel on above-mentioned the 1st line speed record Vl is divided by the 1st power ratio ε l of the 1st recording power Pwl gained, the 2nd erase power Pem on above-mentioned the 2nd line speed record Vm is divided by the 2nd power ratio ε m of the 2nd recording power Pwm gained, and the 3rd erase power Peh on above-mentioned the 3rd line speed record Vh satisfies the relation of following (1) formula divided by the 3rd power ratio ε h of the 3rd recording power Pwh gained:
εh＜εm＜εl …(1)。
2. optic recording method as claimed in claim 1, it is characterized in that, when the ratio ε h/ ε l that establishes above-mentioned the 3rd power ratio ε h and above-mentioned the 1st power ratio ε l is α, record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording step and the relation that satisfies following (2) formula with the record that above-mentioned the 3rd line speed record Vh carries out:
0.45＜α＜0.80 …(2)。
3. optic recording method as claimed in claim 1 or 2, it is characterized in that the record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording step, the record that carries out with above-mentioned the 2nd line speed record Vm and the relation that satisfies following (3) formula with the record that above-mentioned the 3rd line speed record Vh carries out:
Pwl＜Pwm＜Pwh …(3)。
4. an optical recorder is recorded in recorded information on the recording layer of phase-change optical recording medium, it is characterized in that,
Comprise: scrambler, modulate above-mentioned recorded information and generate modulating data;
The mark lengths generating unit generates the mark lengths of expectation according to above-mentioned modulating data; And
Recording portion, generate the recording impulse pattern according to above-mentioned mark lengths, and write down the record mark of the above-mentioned recorded information of expression to above-mentioned recording layer irradiation recording light according to above-mentioned recording impulse pattern, wherein, this recording impulse pattern comprises: rises and at the recording power bigger with the recording impulse that forms between than the little lowest power of above-mentioned erase power from erase power than above-mentioned erase power, and the erasing pulse of rising to above-mentioned erase power from above-mentioned lowest power;
Above-mentioned recording portion is carried out record with the line speed record of selecting to above-mentioned recording layer from the 1st line speed record Vl, the 2nd line speed record Vm and the 3rd line speed record Vh, wherein, and Vl＜Vm＜Vh;
The record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording portion, in record that carries out with above-mentioned the 2nd line speed record Vm and the record that carries out with above-mentioned the 3rd line speed record Vh, the 1st erase power Pel on above-mentioned the 1st line speed record Vl is divided by the 1st power ratio ε l of the 1st recording power Pwl gained, the 2nd erase power Pem on above-mentioned the 2nd line speed record Vm is divided by the 2nd power ratio ε m of the 2nd recording power Pwm gained, and the 3rd erase power Peh on above-mentioned the 3rd line speed record Vh satisfies the relation of following (1) formula divided by the 3rd power ratio ε h of the 3rd recording power Pwh gained:
εh＜εm＜εl …(1)。
5. optical recorder as claimed in claim 4, it is characterized in that, when the ratio ε h/ ε l that establishes above-mentioned the 3rd power ratio ε h and above-mentioned the 1st power ratio ε l is α, record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording portion and the relation that satisfies following (2) formula with the record that above-mentioned the 3rd line speed record Vh carries out:
0.45＜α＜0.80 …(2)。
6. as claim 4 or 5 described optical recorders, it is characterized in that the record that carries out with above-mentioned the 1st line speed record Vl in the above-mentioned recording portion, the record that carries out with above-mentioned the 2nd line speed record Vm and the relation that satisfies following (3) formula with the record that above-mentioned the 3rd line speed record Vh carries out:
Pwl＜Pwm＜Pwh …(3)。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001297481A (en) * | 2000-04-14 | 2001-10-26 | Ricoh Co Ltd | Phase transition optical recording medium |
| CN1321305A (en) * | 1999-07-07 | 2001-11-07 | 皇家菲利浦电子有限公司 | Method and device for recording marks in information layer of optical record carrier |
| US6388978B1 (en) * | 1998-04-16 | 2002-05-14 | Ricoh Company, Ltd. | Optical recording method for a rewritable phase-change optical recording medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6388978B1 (en) * | 1998-04-16 | 2002-05-14 | Ricoh Company, Ltd. | Optical recording method for a rewritable phase-change optical recording medium |
| CN1321305A (en) * | 1999-07-07 | 2001-11-07 | 皇家菲利浦电子有限公司 | Method and device for recording marks in information layer of optical record carrier |
| JP2001297481A (en) * | 2000-04-14 | 2001-10-26 | Ricoh Co Ltd | Phase transition optical recording medium |
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