CN101065799A - Optical recording medium, recording method thereof and evaluation method of optical recording medium - Google Patents

Abstract

A recording method of an optical recording medium comprises irradiating the medium with a laser having m pulse sets each comprising a heating pulse and a cooling pulse, in which m is a natural number; and scanning the medium with the laser at a scanning speed v to record marks each of a length nT, in which n is a natural number of 3 or more and T is a clock cycle, wherein a length TCPn of a last cooling pulse is changed by the scanning speed v as indicated by the following expression, TCPn/T=f1,n (v) in the range of v<vo, TCPn/T=f2,n (v) in the range of v>=vo, and wherein f1,n (v) and f2,n (v) are set in an area where presence ratio of an abnormal mark is equal to or less than 10<-4>. In the equations, v0 is a selectivele scanning speed.

Description

The evaluation method of optical recording media and recording method thereof and optical recording media

Technical field

The present invention relates to a kind of rewritable optical recording medium that uses phase-change material at recording layer for example CD-RW, DVD-RW, DVD+RW, DVD-RAM etc., the recording method of described optical recording media and the evaluation method of described optical recording media.

Background technology

Know, come to be writing speed setup parameter (seeing patent documentation 1 to 3) by linear function.Especially, the technology that progressively changes parameter is open in patent documentation 2 and 3.

But, do not mention that wherein any one at least length (irradiation time) in final heating pulse and the final cooling pulse changes discontinuously.

With CD-RW, DVD-RW, DVD+RW etc. be representative application the rewritable disk of phase change technique by the information record purpose of popularization and application widely in audio/visual purpose and computing machine.And, predicted the improvement of the writing speed on these dishes and the numerical information capacity of increase in recent years.Overwrite performance under overwrite performance under the higher sweep velocity and the broad sweep velocity scope all is to use the high-speed disc record of this phase change technique needed.The former is a maximum recording rate, and the latter is equivalent to recordable velocity range.Especially, the latter is corresponding to CAV (Constant Angular Velocity) record, this be a kind of for quickening the random access record necessary technology; Therefore need about 2.4 times speed proportional (top speed/minimum speed).And in CAV record, the writing scan speed v changes corresponding to record radial location r, that is to say, and the v/r=constant, it all should be recordable therefore being lower than in any writing speed of maximum recording rate.In addition, if top speed increases, the scope of sweep velocity also enlarges inevitably.For example, in the DVD+RW of 4 times of speed dish, CAV needs 5.8 to 14.0m/s sweep velocity scope, but in the dish of 8 times of speed, just need 11.6 to 27.9m/s sweep velocity scope, therefore, need the optical recording media that exploitation can write down and the recording method of described optical recording media in the scope corresponding to the non-constant widths of 8 times of speed dishes.

On the other hand, the material of recording layer must change the record that is suitable for more speed into, so that improve maximum recording rate.Usually, to be applied to DVD+RW be in the recording layer material of dish of representative to phase-change material.For example, generally speaking, described phase-change material is made by alloy that can reversible transition between amorphous phase and crystalline phase.When improving writing speed, must use phase-change material to quicken the phase transformation between amorphous phase and crystalline phase with high crystalline rate.

But, improve crystalline rate and cause when low-speed record, being difficult to the control crystalline phase.Therefore, must significantly change at the velocity band of the speed of approaching the record with near the recording method in the velocity band of all time low speed (strategy).Therefore, can will exist in the problem that record becomes very difficult under any writing speed that is lower than maximum recording rate corresponding to the recording layer material of high-speed record if use.

Patent documentation 1 Japanese Patent Application Publication No.2000-322740

Patent documentation 2 Japanese Patent Application Publication No.2001-118245

Patent documentation 3 Japanese Patent Application Publication No.2001-243626

Summary of the invention

The purpose of this invention is to provide the recording method that top speed is higher than the rewritable optical recording medium CAV record 8 times of speed, that can be used for using phase change technique of DVD+RW, the i.e. recording method (Write strategy) of the light medium that can write down under any writing speed of the maximum recording rate that is lower than optical recording media can be by the optical recording media of described recording method record and the evaluation method of this optical recording media.

The invention provides the recording method of optical recording media.In aspect first of recording method, recording method corresponding to the optical recording media of different recording speed is provided, it comprises: with the laser radiation medium with m pulsegroup, wherein each pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And scan described medium with laser with sweep velocity v and be the mark of nT with record length on this medium, wherein n is 3 or bigger natural number, T is the clock period, and satisfies the relation of m＜n,

Wherein: as the length T of the last cooling pulse of m cooling pulse _CPnUse following function (1) and (2) to determine according to sweep velocity v,

At v＜v ₀Scope in, T _CPn/ T=f _{1, n}(v) function (1)

At v 〉=v ₀Scope in, T _CPn/ T=f _{2, n}(v) function (2)

F wherein _{1, n}(v) and f _{2, n}(continuous function of v) all representing sweep velocity v is to satisfy f _{1, n}(v ₀)＞f _{2, n}(v ₀) relation; f _{1, n}(v) and f _{2, n}(v) all meet the following conditions: the ratio that exists of abnormal marking is 1.0 * 10 ^-4Or still less, the ratio that exists of described abnormal marking is the ratio of abnormal marking quantity and normal labeled quantity, normal labeled satisfies the requirement of L/nT 〉=n-0.5 and the requirement that abnormal marking satisfies L/nT＜n-0.5, and wherein L is by reproducing the length of respectively reproducing mark that record mark obtains; And v ₀Be selected satisfied 1.0 * 10 ^-4Or there is any sweep velocity of ratio in abnormal marking still less.

According to the recording method of the optical recording media of first aspect, optimize the length T of last cooling pulse _CPnThereby, do not experience the temperature changing process that can cause the intrinsic anomalous crystal growth of corresponding recording layer material at a high speed, thereby suppress appearance above the mark lengths of specification.In addition, length T _CPnContinuous function by two types limits, and can both easily determine T for any sweep velocity v _CPnOptimum value, therefore can have the high record that reproduces reliability.

In the recording method of the optical recording media of first aspect, preferably, as the length T of the last heating pulse of m heating pulse _LPnSuitably controlled.Preferably, f _{1, n}(v) and f _{2, n}(at least one v) is the linear function of sweep velocity v.Preferably, function m when n is even number=n/2 sets up, function m when n is odd number=(n-1)/2 set up.Preferably, satisfy function v _H/ v _L〉=2.4 and 0.4v _H≤ v ₀≤ 0.8v _H, the maximum recording rate of its medium is by v _HThe all time low speed of expression and medium is by v _LExpression.

In these methods, parameter T _CPnCan determine by the linear function of sweep velocity, so parameter T _CPnCan under error seldom, easily determine.In addition, compare with complicated function, its can reduce will be in optical recording media the quantity of the parameter of preformatting (pre-formatted), and can come high-speed record under corresponding 20m/s or the higher sweep velocity by using the 2T strategy.And, because optimized corresponding speed width and sweep velocity v ₀, therefore can in described CAV record, obtain superperformance.

In aspect second of recording method, recording method corresponding to the optical recording media of different recording speed is provided, it comprises: with the laser radiation medium with m pulsegroup, wherein each pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And scan described medium with laser with sweep velocity v and be the mark of nT with record length on this medium, wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

Wherein, as the length T of the last heating pulse of m heating pulse _LPnUse following function (3) and (4) to determine according to sweep velocity v,

At v＜v ₀Scope in, T _LPn/ T=g _{1, n}(v) function (3)

At v 〉=v ₀Scope in, T _LPn/ T=g _{2, n}(v) function (4)

Wherein, g _{1, n}(v) and g _{2, n}(continuous function of v) all representing sweep velocity v is to satisfy g _{1, n}(v ₀)＞g _{2, n}(v ₀) relation; g _{1, n}(v) and g _{2, n}(v) all meet the following conditions: it is 1.0 * 10 that there is ratio in abnormal marking ^-4Or still less, it is the ratio of abnormal marking quantity and normal labeled quantity that there is ratio in described abnormal marking, normal labeled satisfies the requirement of L/nT 〉=n-0.5 and the requirement that abnormal marking satisfies L/nT＜n-0.5, and wherein L is by reproducing the length of respectively reproducing mark that record mark obtains; And v ₀Be selected satisfied 1.0 * 10 ^-4Or there is any sweep velocity of ratio in abnormal marking still less.

According to the recording method of the optical recording media of second aspect, optimize the length T of last heating pulse _LPnSo that do not experience the temperature changing process that can cause the intrinsic anomalous crystal growth of corresponding recording layer material at a high speed, thereby suppress appearance above the mark lengths of specification.In addition, length T _LPnContinuous function by two types limits, and can easily determine T for any sweep velocity v _LPnOptimum value, therefore can easily have the high record that reproduces reliability.

In the recording method of the optical recording media of second aspect, preferably, as the length T of the last cooling pulse of m cooling pulse _CPnSuitably controlled.Preferably, g _{1, n}(v) and g _{2, n}(at least one v) is the linear function of sweep velocity v.Preferably, function m when n is even number=n/2 sets up, function m when n is odd number=(n-1)/2 set up.Preferably, satisfy function v _H/ v _L〉=2.4 and 0.4v _H≤ v ₀≤ 0.8v _H, the tidemark-sweep velocity of its medium is by v _HAll time low-the sweep velocity of expression and medium is by v _LExpression.

In these methods, parameter T _LPnCan determine by the linear function of sweep velocity, so this parameter can easily be determined under error seldom.In addition, compare with complicated function, it can reduce will be by the quantity of the parameter of preformatting in optical recording media, and can come high-speed record under corresponding 20m/s or the higher sweep velocity by adopting the 2T strategy.And, because optimized corresponding speed width and sweep velocity v ₀, therefore can in described CAV record, obtain superperformance.

In aspect the 3rd of recording method, recording method corresponding to the optical recording media of different recording speed is provided, it comprises: with the described medium of laser radiation with m pulsegroup, wherein each pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And scan described medium with laser with sweep velocity v and be the mark of nT with record length on this medium, wherein n is 3 or bigger natural number, T is the clock period, and satisfies the relation of m＜n,

Wherein, as the length T of the last cooling pulse of m cooling pulse _CPnWith length T as the last heating pulse of m heating pulse _LPnUse determining of following function (1) to (4) according to sweep velocity v respectively,

At v＜v ₀Scope in, T _CPn/ T=f _{1, n}(v) function (1)

At v 〉=v ₀Scope in, T _CPn/ T=f _{2, n}(v) function (2)

At v＜v ₀Scope in, T _LPn/ T=g _{1, n}(v) function (3)

At v 〉=v ₀Scope in, T _LPn/ T=g _{2, n}(v) function (4)

F wherein _{1, n}(v), f _{2, n}(v), g _{1, n}(v) and g _{2, n}(continuous function of v) all representing sweep velocity v is to satisfy f _{1, n}(v ₀)＞f _{2, n}(v ₀) and g _{1, n}(v ₀)＞g _{2, n}(v ₀) relation; f _{1, n}(v), f _{2, n}(v), g _{1, n}(v) and g _{2, n}(v) all meet the following conditions: it is 1.0 * 10 that there is ratio in abnormal marking ^-4Or still less, it is the ratio of abnormal marking quantity and normal labeled quantity that there is ratio in described abnormal marking, the quantity of normal labeled satisfies the requirement of L/nT 〉=n-0.5 and the requirement that abnormal marking satisfies L/nT＜n-0.5, wherein L is the length of respectively reproducing mark that obtains by the reproduction record mark, and v ₀Be selected satisfied 1.0 * 10 ^-4Or there is the arbitrary scan speed of ratio in abnormal marking still less.

According to the recording method of the optical recording media of the third aspect, optimize the length T of last cooling pulse _CPnLength T with last heating pulse _LPnSo that do not experience the temperature changing process that can cause the intrinsic anomalous crystal growth of corresponding recording layer material at a high speed, thereby inhibition exceeds the appearance of the mark lengths of specification.In addition, length T _CPnAnd length T _LPnLimit by two types continuous function respectively, and can easily determine T for any sweep velocity v _CPnAnd T _LPnOptimum value, therefore can easily have the high record that reproduces reliability.

In the recording method of the optical recording media of the third aspect, preferably, f _{1, n}(v) and f _{2, n}(at least one v) and g _{1, n}(v) and g _{2, n}(at least one v) is the linear function of sweep velocity v.Preferably, function m when n is even number=n/2 sets up, function m when n is odd number=(n-1)/2 set up.Preferably, satisfy v _H/ v _L〉=2.4 and 0.4v _H≤ v ₀≤ 0.8v _HFunction, the tidemark-sweep velocity of its medium is by v _HAll time low-the sweep velocity of expression and medium is by v _LExpression.

In recording method according to optical recording media of the present invention, parameter T _CPnAnd T _LPnCan determine by the linear function of sweep velocity v, so these parameters can easily be established under error seldom.In addition, compare with complicated function, its can reduce will be in optical recording media the quantity of the parameter of preformatting, and can use high-speed record under 2T corresponding 20m/s of strategy or the higher sweep velocity.And, because optimized corresponding speed width and sweep velocity v ₀, therefore can in described CAV record, obtain superperformance.

In addition, the invention provides optical recording media.In the first aspect of optical recording media, the optical recording media that provides the recording method that can use first aspect to write down wherein can be determined v in single meaning ground ₀, f _{1, n}(v) and f _{2, n}(information v) is by preformatting.

In aspect second of optical recording media, the optical recording media that provides the recording method that can use second aspect to write down wherein can be determined v in single meaning ground ₀, g _{1, n}(v) and g _{2, n}(information v) is by preformatting.

In aspect the 3rd of optical recording media, the optical recording media that provides the recording method that can use the third aspect to write down wherein can be determined v in single meaning ground ₀, f _{1, n}(v), f _{2, n}(v), g _{1, n}(v) and g _{2, n}(information v) is by preformatting.

According to first in the third aspect any one optical recording media since optimal parameter in optical recording media by preformatting, so suitable parameters can easily be calculated by recording unit.

In addition, the invention provides the evaluation method of optical recording media.In the first aspect of evaluation method, the evaluation method corresponding to the optical recording media of different recording speed is provided, it comprises:

When mark recorded on the optical recording media in the following manner: with the described medium of laser radiation with m pulsegroup, wherein each pulsegroup comprised that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And scan described medium with laser with sweep velocity v and be the mark of nT with record length on this medium, wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

By to length T as the last cooling pulse of m cooling pulse _CPnMake different changes and carry out test record; Reproduce the test record mark; Measure each length L of reproducing mark; Count the abnormal marking of the normal labeled of the L/nT 〉=n-0.5 that meets the demands and the L/nT＜n-0.5 that meets the demands; And obtain abnormal marking and exist ratio to estimate the quality of optical recording media, this ratio is the ratio of abnormal marking quantity and normal labeled quantity.

In aspect second of evaluation method, provide the evaluation method corresponding to the optical recording media of different recording speed, it comprises:

When optical recording media is direct overwrite medium, wherein mark is to record in the following manner on this medium: with the described medium of laser radiation with m pulsegroup, it is the cooling pulse of Pc that each pulsegroup all comprises heating pulse and the power that power is Pw, and wherein m is a natural number; And be the mark of nT with record length on this medium at the described medium of scanning under the sweep velocity v with laser, wherein n is 3 or bigger natural number, T is the clock period, and satisfy the relation of m＜n, and record mark is wiped in the following manner: use to have the not posting field of power as the space between the serving as a mark of the laser radiation medium of the erasing pulse of Pe, wherein satisfy the relation of Pw＞Pe＞Pc

Carry out test record by differently changing power P e; Reproduce the test record mark; Measure and reproduce mark length L separately; Counting satisfies the normal labeled and the abnormal marking that satisfies the requirement of L/nT＜n-0.5 of the requirement of L/nT 〉=n-0.5; And obtain abnormal marking and exist ratio to estimate the quality of optical recording media, it is the ratio of abnormal marking quantity and normal labeled quantity that there is ratio in this abnormal marking.

In the evaluation method of the optical recording media aspect first and second, preferably, under the situation of n=3, has 3T mark alternately and the pattern in 3T mark gap is carried out test record by using.Preferably, sweep velocity is set at the maximum recording rate of medium and the mean value of all time low speed.Preferably, under all time low speed of medium, under the situation of n=4, has 4T mark alternately and the pattern in 4T gap is carried out test record by using.

Description of drawings

Figure 1A is the figure of NRZI data in the expression 2T strategy.

Figure 1B is the figure when n=3 and m=1 in the expression 2T strategy.

Fig. 1 C is the figure when n=8 and m=4 in the expression 2T strategy.

Fig. 2 A is the synoptic diagram that is illustrated in the shape of record mark in the example of anomalous crystal growth.

Fig. 2 B is the synoptic diagram of reproducing signal under the expression anomalous crystal growth situation about existing.

Fig. 2 C is the figure that is illustrated in the binary signal in the example of anomalous crystal growth.

Fig. 3 result's that to be expression measure the binary signal of Fig. 2 C by TIA curve map.

Fig. 4 be the expression abnormal marking have ratio and a T _CP3Curve map with the correlativity of v.

Fig. 5 be the expression abnormal marking have ratio and a T _LP3Curve map with the correlativity of v.

Fig. 6 is that expression is worked as abnormal marking more than 1.0 * 10 ^-4The time v and T _CP3The curve map of scope.

Fig. 7 represents according to the present invention and the curve map of the parameter setting method of routine techniques.

Fig. 8 is the curve map of the correlativity of pulse length and sweep velocity among the expression embodiment 1.

Fig. 9 is the curve map of the correlativity of the ratio between abnormal marking quantity and normal labeled quantity and sweep velocity among the expression embodiment 1.

Figure 10 is the curve map of the correlativity of pulse length and sweep velocity in the expression Comparative Examples 1.

Figure 11 is the curve map of the correlativity of the ratio between abnormal marking quantity and normal labeled quantity and sweep velocity in the expression Comparative Examples 1.

Figure 12 is the curve map of the correlativity of pulse length and sweep velocity among the expression embodiment 2.

Figure 13 is the curve map of the correlativity of the ratio between abnormal marking quantity and normal labeled quantity and sweep velocity among the expression embodiment 2.

Figure 14 is the curve map of the correlativity of pulse length and sweep velocity among the expression embodiment 3.

Figure 15 is the curve map of the correlativity of the ratio between abnormal marking quantity and normal labeled quantity and sweep velocity among the expression embodiment 3.

Figure 16 is the curve map of the correlativity of pulse length and sweep velocity among the expression embodiment 4.

Figure 17 be the expression abnormal marking have ratio and a T _CPnThe synoptic diagram of correlativity.

Figure 18 is ratio and the T between abnormal marking quantity and normal labeled quantity among the expression embodiment 5 _CP3The curve map of correlativity.

Figure 19 is the result's that obtained in the correlativity of the abnormal marking quantity of expression from embodiment 6 and ratio between normal labeled quantity and Pe a curve map.

Figure 20 is ratio and the T between expression abnormal marking quantity and normal labeled quantity _CPnThe curve map of correlativity.

Embodiment

The recording method of＜optical recording media and optical recording media 〉

In first embodiment according to the recording method of optical recording media of the present invention, the recording method corresponding to the optical recording media of different recording speed comprises:

With the laser radiation medium with m pulsegroup, wherein each pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And

Scan described medium with laser with sweep velocity v and be the mark of nT with record length on this medium, wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

Wherein:

Length T as the last cooling pulse of m cooling pulse _CPnUse following function (1) and (2) to determine according to sweep velocity v,

At v＜v ₀Scope in, T _CPn/ T=f _{1, n}(v) function (1)

At v 〉=v ₀Scope in, T _CPn/ T=f _{2, n}(v) function (2)

F wherein _{1, n}(v) and f _{2, n}(continuous function of v) all representing sweep velocity v is to satisfy f _{1, n}(v ₀)＞f _{2, n}(v ₀) relation;

f _{1, n}(v) and f _{2, n}(v) all meet the following conditions: the ratio that exists of abnormal marking is 1.0 * 10 ^-4Or still less, wherein the ratio that exists of this abnormal marking is the ratio of abnormal marking quantity and normal labeled quantity, normal labeled satisfies the requirement of L/nT 〉=n-0.5 and the requirement that abnormal marking satisfies L/nT＜n-0.5, wherein L is the length by each the reproduction mark that reproduces the record mark acquisition, and v ₀Be that the selected ratio that exists that satisfies abnormal marking is 1.0 * 10 ^-4Or any sweep velocity still less.

In second embodiment according to the recording method of optical recording media of the present invention, the recording method corresponding to the optical recording media of different recording speed comprises:

With the laser radiation medium with m pulsegroup, described pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And

Is the mark of nT at the described medium of scanning under the sweep velocity v with record length on this medium with laser, and wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

Wherein:

Length T as the last heating pulse of m heating pulse _LPnUse following function (3) and (4) to determine according to sweep velocity v,

At v＜v ₀Scope in, T _LPn/ T=g _{1, n}(v) function (3)

At v 〉=v ₀Scope in, T _LPn/ T=g _{2, n}(v) function (4)

G wherein _{1, n}(v) and g _{2, n}(continuous function of v) all representing sweep velocity v is to satisfy g _{1, n}(v ₀)＞g _{2, n}(v ₀) relation;

g _{1, n}(v) and g _{2, n}(v) all satisfy following condition: the ratio that exists of abnormal marking is 1.0 * 10 ^-4Or still less, wherein the ratio that exists of this abnormal marking is the ratio of abnormal marking quantity and normal labeled quantity, normal labeled satisfies the requirement of L/nT 〉=n-0.5 and the requirement that abnormal marking satisfies L/nT＜n-0.5, and wherein L is the length by each the reproduction mark that reproduces the record mark acquisition, and

v ₀Be that the selected ratio that exists that satisfies abnormal marking is 1.0 * 10 ^-4Or any sweep velocity still less.

In the 3rd embodiment according to the recording method of optical recording media of the present invention, the recording method corresponding to the optical recording media of different recording speed comprises:

With the laser radiation medium with m pulsegroup, wherein each pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And

Be the mark of nT at the described medium of scanning under the sweep velocity v with record length on this medium with laser, wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

Wherein:

Be respectively the last cooling pulse of m cooling pulse and m heating pulse and the length T of last heating pulse _CPnAnd length T _LPnAll use following function (1) to (4) to determine according to sweep velocity v,

At v＜v ₀Scope in, T _CPn/ T=f _{1, n}(v) function (1)

At v 〉=v ₀Scope in, T _CPn/ T=f _{2, n}(v) function (2)

At v＜v ₀Scope in, T _LPn/ T=g _{1, n}(v) function (3)

At v 〉=v ₀Scope in, T _LPn/ T=g _{2, n}(v) function (4)

F wherein _{1, n}(v), f _{2, n}(v), g _{1, n}(v) and g _{2, n}(continuous function of v) all representing sweep velocity v is to satisfy f _{1, n}(v ₀)＞f _{2, n}(v ₀) and g _{1, n}(v ₀)＞g _{2, n}(v ₀) relation;

f _{1, n}(v), f _{2, n}(v), g _{1, n}(v) and g _{2, n}(v) all meet the following conditions: the ratio that exists of abnormal marking is 1.0 * 10 ^-4Or still less, the ratio that exists of wherein said abnormal marking is the ratio of abnormal marking quantity and normal labeled quantity, normal labeled satisfies the requirement of L/nT 〉=n-0.5 and the requirement that abnormal marking satisfies L/nT＜n-0.5, wherein L is the length by each the reproduction mark that reproduces the record mark acquisition, and

v ₀Be that the selected ratio that exists that satisfies abnormal marking is 1.0 * 10 ^-4Or any sweep velocity still less.

In first embodiment according to optical recording media of the present invention, optical recording media can be recorded by using the recording method according to this first embodiment, wherein can determine v in single meaning ground ₀, f _{1, n}(v) and f _{2, n}(information v) is by preformatting.

In second embodiment according to optical recording media of the present invention, optical recording media can be recorded by using the recording method according to this second embodiment, wherein can determine v in single meaning ground ₀, g _{1, n}(v) and g _{2, n}(information v) is by preformatting.

In the 3rd embodiment according to optical recording media of the present invention, optical recording media can be recorded by using the recording method according to the 3rd embodiment, wherein can determine v in single meaning ground ₀, f _{1, n}(v), f _{2, n}(v), g _{1, n}(v) and g _{2, n}(information v) is by preformatting.

Next will describe in detail according to optic recording method of the present invention.Also will be by to the description of the recording method of optical recording media and illustrated according to the details of optical recording media of the present invention.

The optical recording media of having used recording method of the present invention is to have the optical recording media of constant information wire (line) density and must all is recordable and rewritable under different writing speeds.For logging mode, preferred pulse width modulated pattern, wherein length is that mark and the mark space of nT (wherein n is that natural number and T are the clock period) is used as the information record, and RLL (run length (Run Length Limited)) pattern has been widely used in dish.As the example, the EFM of CD-RW, DVD+RW and the EFM+ of DVD-RW have been provided.In this case, writing speed v and clock period T must satisfy v * T=constant and keep information row density constant.And v must satisfy the condition of v/r=constant and come corresponding with the CAV record with respect to dish radial location r.Therefore, record must be lower than the maximum recording rate v of medium _HBe higher than all time low speed v _LAny speed under carry out, thereby any radial position is by the CAV record on medium.In the 120mm diameter dish that with CD, DVD is representative, preferred v _H/ v _L〉=2.4.

In the optical recording media of having used recording method of the present invention, thereby come recorded information by in recording layer material, producing the phase transformation between crystalline phase and amorphous phase and form amorphous mark through the light after the intensity modulated near the irradiation recording layer and scanning.And preferred tray is used recording layer material and the maximum recording rate v with high crystalline rate _HBe 20m/s or higher.

-Write strategy-

Light after intensity modulated carries out by above-mentioned irradiation and scanning corresponding to the information record that is recorded into these optical recording medias of high-speed record.These recording methods are commonly called " Write strategy ".When forming length and be the record mark of nT, with the described medium of laser radiation with m pulsegroup, wherein each pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pb.At this moment, satisfy Pw＞＞relation of Pb.And power P w can be changed arbitrarily according to sweep velocity in record, but power P w is set to the power that is enough to melt recording layer.Power P w is preferably within 20 to 40mW scope to come corresponding to 8 times of fast DVD+RW.Power P b must be very low, low is heated the recording layer of melted to being enough to cooling rapidly, and preferably within 0 to 1mW scope.

Number of pulses m can at random be set, and mark lengths can easily be controlled by the relation that satisfies m＜n.In addition, the relation that mark lengths and pulse number can be by satisfying m=n-k (k be 1 or bigger natural number) reaches proportionate relationship, and further is convenient to the control to mark lengths.For example, in DVD+RW, satisfied the relation of m=n-1.But, equate with 8 times of fast DVD+RW that if writing speed becomes clock period T will become 4.8ns or still less.On the contrary, the response time of 10 to 90% existing LD is long or the more and reciprocal process need 3ns of 1.5ns or more.Therefore, be big with respect to the loss of the light period of 4.8ns, so can not obtain to add fully thermal effect and cooling effect.Therefore, preferably reduce m has short clock period T with correspondence high-speed record.

The standard criterion of U.S. CD-RW is rolled up 3,1.1 editions 2T strategies that adopted by Orange Book Part III, and it provides as the example that reduces m.

The example of 2T strategy is shown in Figure 1A to Fig. 1 C.Figure 1A has represented NRZI (NRZ) data.Situation when Figure 1B has represented n=3, m=1, the situation when Fig. 1 C has represented n=8, m=4.In other words, in the 2T strategy, by getting m=n/2 and get m=(n-1)/2 when n is even number when n being odd number, the cycle of heating pulse has become about 2T.Compare with the situation of m=n-1, even in high-speed record, also can melt and cool off fast recording layer with short clock period T.In addition, preferably make m≤n/2 with 8 times of speed or higher high-speed record corresponding to DVD.

The length of heating pulse and the length of cooling pulse, just each irradiation time can be set arbitrarily respectively, but preferably sets appropriate value according to the variation of sweep velocity v and clock period T in record.

Corresponding to the CD-RW Write strategy of the record of 4 times of speed to 10 times speed and rewriting at Orange Book Part III as U.S. CD-RW standard criterion, roll up 2,1.1 editions in explanation.Under 4 times of speed (v=4.8m/s, T=57.9ns), heating pulse=0.2T, cooling pulse=0.8T; Under 8 times of speed (v=9.6m/s, T=28.9ns), heating pulse=0.4T, cooling pulse=0.6T; Under 10 times of speed (v=12.0m/s, T=23.1ns), heating pulse=0.5T, cooling pulse=0.5T.That is to say that speed is high more, the length of heating pulse is just long more with respect to the clock period, and the length of cooling pulse is just short more with respect to the clock period.Become proportional relation with the correlativity of v.

With respect to the heating pulse width of 1 times of speed to 2.4 times speed as in the DVD+ReWritable 4.7G byte basic format canonical system explanation (4.7GByte BasicFormat Specifications System Description) of the standard criterion of DVD+RW 1.2 editions by the ratio expression formula explanation of sweep velocity v.

In addition, by describing length with the continuous function of the sweep velocity v in the early stage publication application of Japan (JP-A) 2000-322740, JP-A2001-118245 and JP-A 2001-243626, the length separately of heating pulse and cooling pulse can obtain describing by best titime parameter under any writing speed.

If v is v in the writing speed zone _L≤ v≤v _HVelocity band in be determined, the length of heating pulse and cooling pulse can be determined in all these technology uniquely.

But, these technology be not suitable for use above-mentioned can corresponding v _HIn the optical recording media of the recording layer material of 〉=20m/s.Although the crystalline rate of recording layer material must improve with corresponding with high-speed record, (being inversely proportional to sweep velocity) shortened in the acceleration of sweep velocity during irradiates light to the time on the optical recording media was recorded inevitably.As a result, the formation of crystallization or amorphous phase must be carried out in the short period of time.Because the formation of amorphous phase is undertaken by rapid cooling recording layer, easy more this fact of quenching of the fast more recording layer of sweep velocity is not brought inconvenience, but crystallization must be cooled off lentamente, therefore if irradiation time shortens this difficulty that just becomes.For this reason, preferably crystallization is carried out in short irradiation time by the crystalline rate that improves recording layer material.

But in having the recording layer material of high crystalline rate like this, anomalous crystal growth appears in the fine difference owing to record condition easily.The example of anomalous crystal growth is schematically shown in Fig. 2 A.The mark that is write down under the situation that Fig. 2 A represents to write down by the Write strategy shown in Figure 1B, this Write strategy use has the 3T mark alternately and the pattern in 3T gap.(shape of mark can be passed through transmission electron microscope observing.) shown in Fig. 2 A, mark A and mark C are normal record marks, and anomalous crystal growth occurs at the end of mark B.Shown in Fig. 2 B, the reproducing signal under such anomalous crystal growth situation makes normal condition (dotted line) distortion.As a result, the signal after the binarization shown in Fig. 2 C, only be mark B with anomalous crystal growth be shorter than in the time of 3T reproduced.

If the signal after the binarization of Fig. 2 C by the occurrence rate of TIA (time interval analysis) measurement with evaluation of markers B, can obtain for example to be shown in the result of Fig. 3.That is to say that it is divided into 3T is that central value is made the part of normal distribution and the part that distributes at shorter side.The part that distributes at shorter side is caused by anomalous crystal growth.If get the quantity of mark (abnormal marking) and the ratio of the quantity of mark (normal labeled), can find that this ratio depends on the length T of writing speed v, last heating pulse significantly with normal distribution with anomalous crystal growth _LP3Length T with last cooling pulse _CP3

There is ratio in abnormal marking, and promptly abnormal marking quantity is with respect to the ratio and the T of normal labeled quantity _CP3With the correlativity of v as shown in Figure 4.Abnormal marking have ratio and a T _LP3With the correlativity of v as shown in Figure 5.The optical recording media that is used to measure is that 8 times of fast CD-ROM drives up to DVD+RW (are v _H=27.9m/s) under all recordable sample.The ratio that exists of abnormal marking is all becoming very high under the writing speed in certain T scope.Abnormal marking has become the signal that surpasses above-mentioned standard when reproducing, so they become the reason of read error.If this exists ratio more than 1.0 * 10 ^-4, the possibility that becomes uncorrectable error will be high, so the reliability of reproducing signal reduces significantly.

Measure and have the relevant T of ratio with abnormal marking _CPnMethod be explained as follows.

This exists ratio to measure by the record of the pattern of carrying out nT mark and nT gap and alternately arranging.At this moment, T _LPnCan at random set according to v, but preferably as the characteristic of percentage modulation asymmetry, shake be optimized to preferred values, and preferred T _LPnBe set at same with other pulsion phase of pulse train basically irradiation time, described pulse train is the individual pulse of first pulse to the (m-1).At this moment, can use continuous function or use two functions to set T according to sweep velocity v _LPn

Irradiation power and erase power to heating pulse are set optimal recording power.Optimal recording power can use the information of preformatting on the optical recording media or can pass through OPC (best power control) and set.

Sweep velocity is set in sweep velocity v ₀, as described below at this sweep velocity v ₀Under be used to set T _CPnFunction be changed to function (2) from function (1).At this moment, clock period T also must be set suitably according to this sweep velocity.

Test record is passed through at different T _CPnUnder above-mentioned setting carry out the T of variation _CPnScope can set arbitrarily, but preferred 0T is to the scope of 3T.If set longly, the possibility of offset track and focusing will increase, and this is because cooling pulse is elongated and lower powered irradiation time prolongs.

When the regional reproduced quantity with the counting of abnormal mark that write down, use suitable binary unit and time interval analyzer as mentioned above.The analysis result of time interval analyzer is (example of n=3) as shown in Figure 3.Here, length is used as the abnormal marking counting less than the mark of (n-0.5) T.On the contrary, the mark of length in (n ± 0.5) T scope is used as the normal labeled counting.The ratio of abnormal marking is to calculate by the ratio of getting abnormal marking quantity and normal labeled quantity.

The correlativity that has ratio of the abnormal marking of Ce Lianging schematically is shown in Figure 17 like this.

Having ratio is 1.0 * 10 ^-4Or scope still less can occur in following two kinds of situations (1) and (2).

(1)T _CPn≤T _CPn(1)

(2)T _CPn≥T _CPn(2)

T _CPnAppropriate value in the scope of (1) and (2), set respectively, set continuous function f _{1, n}And f _{2, n}To satisfy T in the situation (1) _CPn/ T=f _{1, n}(v ₀) requirement and situation (2) in T _CPn/ T=f _{2, n}(v ₀) requirement.Must set each continuous function can obtain the superperformance under all time low speed and maximum recording rate.

Can set T in the same way _LPnWith function g _{1, n}, g _{2, n}

Fig. 6 represents to exist ratio more than 1.0 * 10 when abnormal marking ^-4The time T _CP3Scope with v.In the gray area of Fig. 6, there is the ratio height in abnormal marking, therefore can not determine T _CP3Here, if pay close attention to the point of 3.3 times of speed (v=11.5m/s), T _CP3The scope that can set is limited to T _CP3＞1.5T.On the other hand, can allow T down in 8 times of speed (v=27.9m/s) _CP3＞1.5T and T _CP3Two kinds of solutions of＜0.6T, but T _CP3＞1.5T can cause existing normal recordings and high asymmetry, and this is because mark lengths becomes long.Thereby, must make T _CP3＜0.6T.

For corresponding, be necessary to make any writing speed in 3.3 times of speed to 8 times speed (11.5-27.9m/s) scope all can be set here, with the CAV record.Usually use interpolation method in routine techniques, continuous function is inserted into T in simply in interpolation method _CPn3.3 between the setting value of 8 times of speed.Its example as shown in Figure 7.

Parameter T in the routine techniques _CPnEstablishing method represent by the dotted line among Fig. 7.The situation of simple linear function is represented as an example.In this case, under midrange speed, parameter T _CP3Must be set within the scope that there is ratio in high abnormal marking, cause the remarkable variation of reproduction reliability of tracer signal.

On the contrary, in recording method according to optical recording media of the present invention, parameter T _CPnBe set at high abnormal marking and have value outside the zone of ratio.That is to say, be used to set the function of this parameter at certain midrange speed v ₀(v _L≤ v ₀≤ v _H) under be changed to following function (2) from following function (1), thereby this parameter can be set at high abnormal marking and has value outside the zone of ratio.

That is to say, in the present invention, last cooling pulse T _CPnLength with as minor function definite,

At v＜v ₀Scope in, T _CPn/ T=f1, n (v) function (1)

At v 〉=v ₀Scope in, T _CPn/ T=f2, n (v) function (2)

F wherein _{1, n}(v) and f _{2, n}(continuous function that v) all is v is to satisfy f _{1, n}(v ₀)＞f _{2, n}(v ₀) relation, the result has avoided high zone errors.

Fig. 7 has represented that n=3 is T _CP3Example under the situation.Parameter setting method of the present invention represented by the solid line among Fig. 7, wherein v _H=27.9m/s, v _L=11.5m/s and v ₀=20.9m/s.

High abnormal marking exists the zone of ratio to pass through at v=v ₀The place changes setting value T significantly and discontinuously _CP3Avoid.

Although be used to set T _CP3The speed v of function when function (1) is changed into function (2) ₀Can at random set, this speed should be chosen as and make and can obtain good characteristic, for example jittering characteristic, degree of modulation, wherein T _CPnBe set at high abnormal marking and have value outside the zone of ratio.Therefore, this speed is preferably at 0.4v _H≤ v ₀≤ 0.8v _HScope within.

For continuous function f _{1, n}(v) with f _{2, n}(v), aforementioned relation must be at v=v ₀Shi Chengli, but can set function system arbitrarily.More preferably get function as linear function respectively so that setup parameter.

Length T about last heating pulse _LPn, also suitable using the same method.

That is to say, work as T _LPnBy as minor function (3) and (4) when determining,

At v＜v ₀Scope in, T _LPn/ T=g _{1, n}(v) function (3)

At v 〉=v ₀Scope in, T _LPn/ T=g _{2, n}(v) function (4)

G wherein _{1, n}(v) and g _{2, n}(continuous function that v) all is v is to satisfy g ₁(v ₀)＜g ₂(v ₀) relation, it makes it possible to reduce significantly the quantity of abnormal marking under the intermediate record speed.

Any function system all can be used for g _{1, n}(v) and g _{2, n}(v), but the setting of parameter can make system and easily carry out by using linear function.Although be used to set T _CP3The speed v of function when function (3) is changed into function (4) ₀Can at random set, this speed should be chosen as and make and can obtain good characteristic, for example jittering characteristic, degree of modulation, wherein T _LPnBe set at high abnormal marking and have value outside the zone of ratio.Therefore, this speed is preferably at 0.4v _H≤ v ₀≤ 0.8v _HScope within.

Set T by using a continuous function that is used for sweep velocity v _CPnAnd T _LPnIn any one and use two functions to set another mode or by using two functions to set T _CPnAnd T _LPnMode can reduce the quantity of abnormal marking.Whether which parameter uses two functions to set by number and the master record characteristics of signals (shake, asymmetry etc.) of seeing abnormal marking next definite within needed scope.

＜optical recording media 〉

As mentioned above, the appearance of abnormal marking character crystalline rate etc. for example of greatly depending on recording layer material.Therefore, can determine v ₀, f _{1, n}(v), f _{2, n}(v), g _{1, n}(v) and g _{2, n}(information v) can be in advance in optical recording media by preformatting.For example, when satisfying following function;

f _1，n(v)＝a ₁×v+b ₁

f _2，n(v)＝a ₂×v+b ₂，

A wherein ₁, b ₁, a ₂, b ₂Be the intrinsic constant of optical recording media, expression a ₁, b ₁, a ₂, b ₂And v ₀Information in advance in optical recording media by preformatting.

As the method for the preformatting that uses in the present technique, for example the ATIP extraneous information of CD-RW and the physical message of DVD+RW etc. have been provided.If above-mentioned information is preformatting in each optical recording media, recording unit can obtain the best titime parameter from the information of preformatting.

The evaluation method of＜optical recording media 〉

In first embodiment according to the evaluation method of optical recording media of the present invention, wherein mark is recorded on the optical recording media in the following manner: with the laser radiation medium with m pulsegroup, it is the cooling pulse of Pc that each pulsegroup all comprises heating pulse and the power that power is Pw, and wherein m is a natural number; And be the mark of nT with laser scanned medium under sweep velocity v with record length on recording medium, wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

Evaluation method corresponding to the optical recording media of different recording speed comprises: by differently changing the length T as the last cooling pulse of m cooling pulse _CPnCarry out test record; Reproduce the test record mark; Measure and reproduce mark length L separately; Count the abnormal marking of the normal labeled of the L/nT 〉=n-0.5 that satisfies condition and the L/nT＜n-0.5 that satisfies condition; And obtain abnormal marking and exist ratio to estimate the quality of optical recording media, this ratio is the ratio of abnormal marking quantity and normal labeled quantity.

In second embodiment according to the evaluation method of optical recording media of the present invention, wherein optical recording media is direct overwrite medium, mark is record thereon in the following manner: with the laser radiation medium with m pulsegroup, it is the cooling pulse of Pc that each pulse all comprises heating pulse and the power that power is Pw, and wherein m is a natural number; And be the mark of nT with record length on this medium at scanned medium under the sweep velocity v with laser, wherein n is 3 or bigger natural number, T is the clock period, and satisfy the relation of m＜n, and the mark of record is wiped in the following manner: use that to have power be gap between the mark as the not posting field of the laser radiation medium of the erasing pulse of Pe, wherein satisfy the relation of Pw＞Pe＞Pc

Evaluation method corresponding to the optical recording media of different writing speeds comprises: carry out test record by differently changing power P e; Reproduce the test record mark; Measure and reproduce mark length L separately; Count the abnormal marking of the normal labeled of the L/nT 〉=n-0.5 that satisfies condition and the L/nT＜n-0.5 that satisfies condition; And obtain abnormal marking and exist ratio to estimate the quality of described optical recording media, this ratio is the ratio of abnormal marking quantity and normal labeled quantity.

As mentioned above, the material character that anomalous crystal growth greatly depends on recording layer material is crystalline rate and thermal property for example, and recording method is T _LPnAnd T _CPnEstablishing method.Work as phase-change material, alloy for example, when being used in the recording layer material, the quantity of abnormal marking can reduce if the proportion of composing of purity and component is controlled suitably.But usually, dish is the sandwich construction of film, so the quantity of abnormal marking also forms state along with the film of each layer and fluctuates.That is to say that thermal capacity of each layer and heat conductivity fluctuate along with the mass change of the thickness of layer and film, cause the variation of thermal medium design.The variation of described thermal medium design has the effect that is similar to the change recording method sometimes, so the increase of the variable effect abnormal marking quantity of thermal medium design etc.Thereby suitable evaluation method becomes for the steady production that realizes medium necessary.

A kind of specific evaluation method below will be described.

When detecting optical recording media, sensitivity be bad and when using optical recording condition promptly to have the record condition of abnormal marking seldom suitable detection be very difficult.That is to say that even departing from of target thermal design occurred, the increase of abnormal marking quantity also seldom and therefore is no more than measuring error under many circumstances.So, need have the evaluation method of better sensitivity.

Abnormal marking ratio and T _CPnThe correlativity of setting value as shown in figure 17.Correlativity under the situation of dish characteristics fluctuation as shown in figure 20.The abnormal marking ratio is represented by solid line in the normal disk.Abnormal marking ratio under the situation that the dish characteristic departs from is illustrated by the broken lines.

As mentioned above, the condition (condition A) with abnormal marking of very low quantity is recording parameters T _CPnTop condition.But when when the top condition lower wall fluctuates, the fluctuation of abnormal marking quantity is little.Therefore, the detection reference settings scope under the situation that detects the fluctuation of top condition lower wall becomes very narrow zone.So, if the T in the minor swing zone of abnormal marking quantity _CPnBe used as detected parameters, when measuring error occurs, will cause the remarkable variation of accuracy of detection.

On the contrary, since the huge fluctuation of abnormal marking quantity, T _CPnUnder the situation (condition B) of high abnormal marking quantity, make it possible to adopt wide detection reference settings scope.In addition, even measuring error occurred, accuracy of detection is variation significantly not also.

Consider above-mentioned main points, departed from wittingly at record condition under the situation of optimal conditions and finish detection, make it possible to set the testing conditions that accurately to judge the fluctuation of medium.

Any parameter all can be used as the parameter of having a mind to depart to be used to detect and provides, but the preferred parameter of selecting abnormal marking quantity is caused tremendous influence for example, provides T _CPnOr the ratio Pe/Pw of erase power Pe and recording power Pw.

In addition, can be with any data as the record data in detecting.In order to improve the degree of accuracy of detection, than the mark with random-length alternately and the random data pattern in gap, more preferably record has the mark of equal length alternately and the data pattern in gap, make it possible to reduce the influence of phase mutual interference between code element (phenomenon of the contiguous mark or the effect length reproducing signal in gap), therefore this situation is preferred.

In addition, under the situation of the pattern of using the mark all have equal length and gap, length can at random be set, but is preferably set to the most effective length concerning writing speed.More preferably, use all has the mark of short as far as possible length and the pattern in gap is carried out record, even make the sample size that is used to estimate in identical reproduction length also increase.Therefore, degree of accuracy is further improved.As the example of pattern, provided the 3T mark that has alternately and gap pattern, have the 4T mark alternately and the pattern in gap.

According to the present invention, when suppressing to exceed the mark lengths appearance of specification, record can easily carry out with high reliability, this is because the length of the length of last heating pulse and/or last cooling pulse is determined by two kinds of continuous functions, and for arbitrary scan speed, the optimal value of the length of the length of last heating pulse and/or last cooling pulse can easily be determined.

The present invention will more specifically be explained by embodiment and Comparative Examples, but the present invention is not subjected to the restriction of these embodiment.

(embodiment 1)

Because do not have and 20m/s or the higher corresponding dvd media of high-speed record on the market, therefore make sample disc.

Will be by ZnS and SiO ₂The thick recording layer of the thick lower protective layer of the 60nm that makes of potpourri, the 15nm that makes by the GaSbSnGe alloy, by ZnS and SiO ₂The thick last protective seam of the 10nm that makes of potpourri and the thick reflection horizon of 200nm of making by Ag in turn be laminated on the polycarbonate DVD+RW substrate of the thick and 120mm diameter of 0.6mm, this matrix has the spirality of the 0.74 μ m track pitch that forms by sputtering technology and organizes (spiral continuous group) continuously.And another kind of substrate is bonded at by the commercially available UV resin binder that is used to coil and makes it become the thick dish of 1.2mm on the reflection horizon.Its shape satisfies the standard of DVD+RW fully.

Subsequently, starting (initiation) equipment of recording layer by being used for the inversion of phases dish is at whole surface crystallization.The dish of making is good and satisfies the not various standards of the DVD+RW of recording status

To the records appraisal of the sample disc of making by being used for DVD+RW record and reproduce evaluating apparatus (Pulstec Industry Inc. make, and DDU1000) carries out.The light picker (optical pick-up) that is used to write down and reproduces is as follows.

Wavelength: 659nm

Object lens NA:0.65

Irradiation power during reproduction: 0.7mW

Irradiation power during record: 1.0 to 40.0mW

Sweep velocity can be set within the scope of 3.49m/s to 30.0m/s.

The number generator DTG5027 that Tectronics Co. makes is used for the preparation of Write strategy.Used Write strategy adopts the 2T strategy, the Write strategy of the condition of n=2m+1 when the condition of n=2m and n are odd number when promptly satisfying n and being even number.The 3T mark that has alternately and the pattern in 3T gap have been write down here.The policing parameter of 3T mark is two, i.e. the heating pulse length T _LP3With the cooling pulse length T _CP3Be recorded under the various writing speeds in table 1 condition and carry out.

Table 1

Speed	Sweep velocity v (m/s)	Clock period T (ns)	T LP3/T	T CP3/T
					3.3×	11.52	11.6	0.313	2.125
4.0×	13.96	9.6	0.375	2.125
					5.0×	17.45	7.6	0.438	2.125
6.0×	20.94	6.4	0.500	2.125
					6.0×	20.94	6.4	0.500	0.500
7.0×	24.43	5.5	0.563	0.625
					8.0×	27.92	4.8	0.625	0.750

In addition, parameter T _LP3And T _CP3With the correlativity of sweep velocity as shown in Figure 8.At v ₀Under the situation of=20.94m/s, T _CP3/ T can be by following function representation, v＜v ₀, T _CP3/ T=f _1,3(v)=2.125v 〉=v ₀, T _CP3/ T=f _2,3(v)=0.036v-0.25

Wherein satisfy f _1,3(v ₀)＞f _2,3(v ₀) relation.

In adopting the record of this method, the ratio between abnormal marking quantity and normal labeled quantity and the correlativity of sweep velocity have been obtained.The results are shown in Fig. 9.The ratio that exists of abnormal marking is 1.0 * 10 in the velocity range of 11.52m/s to 27.92m/s ^-4Or still less.

(comparative example 1)

For with embodiment 1 in identical sample disc, record by use with embodiment 1 in same mode carry out, the parameter substitution table 1 in using table 2.As shown in table 2, parameter T _LP3And T _CP3Determine with previous single continuous function.

Table 2

Speed	Sweep velocity v (m/s)	Clock period T (ns)	T LP3/T	T CP3/T
					3.3×	11.52	11.6	0.313	2.125
4.0×	13.96	9.6	0.375	1.850
					5.0×	17.45	7.6	0.438	1.575
6.0×	20.94	6.4	0.500	1.300
					7.0×	24.43	5.5	0.563	1.025
8.0×	27.92	4.8	0.625	0.750

Parameter T _LP3And T _CP3Be shown in Figure 10 with the correlativity of sweep velocity.In two parameters each all uses continuous linear function to determine.The ratio between abnormal marking quantity and normal labeled quantity and the correlativity of sweep velocity are shown in Figure 11.From the result of Figure 11, when finding to be 11.52m/s, 27.92m/s except sweep velocity since abnormal marking exist ratio more than 1.0 * 10 ^-4, so the reproduction reliability of recorded information variation significantly.

(embodiment 2)

For with embodiment 1 in identical sample disc, record by use with embodiment 1 in same mode carry out, the parameter substitution table 1 in using table 3.

Table 3

Speed	Sweep velocity v (m/s)	Clock period T (ns)	T LP3/T	T CP3/T
					3.3×	11.52	11.6	0.313	2.125
4.0×	13.96	9.6	0.328	1.850
					5.0×	17.45	7.6	0.344	1.575
6.0×	20.94	6.4	0.359	1.300
					6.0×	20.94	6.4	0.625	1.300
7.0×	24.43	5.5	0.656	1.025
					8.0×	27.92	4.8	0.688	0.750

Parameter T _LP3And T _CP3Be shown in Figure 12 with the correlativity of sweep velocity.T _CP3Use a continuous function to determine, but T _LP3Use two functions to determine.That is to say, at v＜v ₀Scope in, T _LP3/ T=g _1,3(v)=0.00489v+0.258; At v 〉=v ₀Scope in, T _LP3/ T=g _2,3(v)=0.009v+0.438.In addition, satisfy g _1,3(v ₀)＜g _2,3(v ₀) relation.

Record can be undertaken by this recording method, and measures the Figure 13 that the results are shown in of abnormal marking quantity and normal labeled quantity.

The quantity of comparing abnormal marking with embodiment 1 has increased, but abnormal marking exist ratio 1.0 * 10 ^-4Or in the scope still less.Even compare the quantity of abnormal marking has also greatly reduced with Comparative Examples 1.

(embodiment 3)

For with embodiment 1 in identical sample disc, record by use with embodiment 1 in same mode carry out, except the 2T strategy record by n=10 and m=5 has the pattern and the parameter in the use table 4 in 10T mark alternately and 10T gap., make that the length of heating pulse is identical with the length of last heating pulse here, and identical value among setting and the embodiment 1.

Table 4

Speed	Sweep velocity v (m/s)	Clock period T (ns)	T LP3/T	T CP3/T
					3.3×	11.52	11.6	0.313	1.875
4.0×	13.96	9.6	0.375	1.750
					5.0×	17.45	7.6	0.438	1.625
6.0×	20.94	6.4	0.500	1.500
					6.0×	20.94	6.4	0.500	0.500
7.0×	24.43	5.5	0.563	0.250
					8.0×	27.92	4.8	0.625	0.000

Parameter T _LP10And T _CP10Be shown in Figure 14 with the correlativity of sweep velocity.That is to say, at v ₀T under the situation of=20.94m/s _CP10/ T can be described by following function,

v＜v ₀，T _CP10/T＝f _1，10(v)＝-0.0391v+2.312

v≥v ₀，T _CP10/T＝f _2，10(v)＝-0.072v+2.00

Wherein satisfy f _1,10(v ₀)＜f _2,10(v ₀) relation.

Similarly, measure abnormal marking quantity and normal labeled quantity ratio the results are shown in Figure 15.Confirm the reproduction reliability height of the little and tracer signal of the quantity of abnormal marking in all measured zone.And, confirm that long mark (big n) and the mark under the situation of n=3 and m=1 are effective to record all.

(embodiment 4)

For with embodiment 1 in identical sample disc, record by use with embodiment 1 in identical mode carry out, the parameter in use table 5.

Table 5

Speed	Sweep velocity v (m/s)	Clock period T (ns)	T LP3/T	T CP3/T
					3.3×	11.52	11.6	0.313	2.125
6.0×	20.94	6.4	0.500	2.125
					6.0×	20.94	6.4	0.613	0.432
8.0×	27.92	4.8	0.688	0.750

Parameter T _CP3And T _LP3Be shown in Figure 16 with the correlativity of sweep velocity.T _CP3And T _LP3Use two functions to determine.When carrying out the evaluation method identical with embodiment 1, the ratio that exists of abnormal marking all is 1.0 * 10 under each sweep velocity ^-4Or still less.

(embodiment 5)

Newly prepared two kinds of sample disc, it is similar to embodiment 1 sample disc (dish 1), except having changed recording layer thickness and last protective layer thickness.That is to say that a kind of sample disc that is called as dish 2 is made with thick recording layer of 19nm and the thick last protective seam of 12nm, and another sample disc that is called as dish 3 is made with thick recording layer of 12nm and the thick last protective seam of 6nm.

The mode record that will have 3T mark alternately and 3T gap is on the dish 1 to 3 that makes, and the ratio of abnormal marking quantity and normal labeled quantity is measured on similar embodiment 1 ground.At this moment, sweep velocity is got the 20.9m/s that is equivalent to 6 times of fast DVD, and record is by differently changing T in the scope of 0.75T to 2.25T _CP3Carry out.

T _CP3Be shown in Figure 18 with the correlativity of the ratio of abnormal marking quantity and normal labeled quantity.The ratio of the mark quantity that notes abnormalities and normal labeled quantity changes in the dish of different compositions significantly.

Thereby, can detect the fluctuation of the composition of optical recording media by said method.

(embodiment 6)

For with embodiment 5 in identical dish 1 to 3 record and estimate and carry out in the mode of similar embodiment 1, except sweep velocity is got the 20.9m/s that is equivalent to 6 times of fast DVD, and with T _CP3Be fixed on outside the 0.75T.

Record have alternately the 3T mark and the ratio of the pattern in 3T gap and abnormal marking quantity and normal labeled quantity adopt with embodiment 5 in similarly mode measure.At this moment, record is undertaken by the erase power Pe that differently changes record condition.The ratio of abnormal marking quantity and normal labeled quantity and the correlativity of Pe are shown in Figure 19.In Figure 19, transverse axis is to be fixed in the value of representing with Pw under the situation of 34mW at Pw.

The quantity of mark of noting abnormalities from Figure 19 changes along with the change of erase power Pe.Especially, in the scope of low Pe/Pw, the quantity of abnormal marking is different significantly in dish 1 to 3.

Therefore, when the composition of dish fluctuates with dish 1 to 3, can be by changing the fluctuation that erase power Pe detect the composition of dish.

Claims (18)

1. recording method corresponding to the optical recording media of different recording speed comprises:

With the laser radiation medium with m pulsegroup, wherein each pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And

Scan described medium with laser with sweep velocity v and come on this medium record length to be the mark of nT, wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

Wherein:

Length T as the last cooling pulse of m cooling pulse _CPnUse following function (1) and (2) to determine according to sweep velocity v,

At v＜v ₀Scope in, T _CPn/ T=f _{1, n}(v) function (1)

At v 〉=v ₀Scope in, T _CPn/ T=f _{2, n}(v) function (2)

F wherein _{1, n}(v) and f _{2, n}(continuous function of v) all representing sweep velocity v is to satisfy f _{1, n}(v ₀)＞f _{2, n}(v ₀) relation;

f _{1, n}(v) and f _{2, n}(v) all meet the following conditions: wherein the ratio that exists of abnormal marking is 1.0 * 10 ^-4Or still less, the ratio that exists of this abnormal marking is the ratio of abnormal marking quantity and normal labeled quantity, normal labeled satisfies the requirement of L/nT 〉=n-0.5 and the requirement that abnormal marking satisfies L/nT＜n-0.5, and wherein L is the length by each the reproduction mark that reproduces the record mark acquisition, and

v ₀Be that the selected ratio that exists that satisfies abnormal marking is 1.0 * 10 ^-4Or arbitrary scan speed still less.

2. according to the recording method of the optical recording media of claim 1, further comprise and suitably control length T as the last heating pulse of m heating pulse according to sweep velocity v _LPn

3. according to the recording method of the optical recording media of any in claim 1 and 2, f wherein _{1, n}(v) and f _{2, n}(at least one v) is the linear function of sweep velocity v.

4. recording method corresponding to the optical recording media of different recording speed comprises:

With the laser radiation medium with m pulsegroup, wherein each pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And

Scan described medium with laser with sweep velocity v and come on this medium record length to be the mark of nT, wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

Wherein:

Length T as the last heating pulse of m heating pulse _LPnUse following function (3) and (4) to determine according to sweep velocity v,

At v＜v ₀Scope in, T _LPn/ T=g _{1, n}(v) function (3)

At v 〉=v ₀Scope in, T _LPn/ T=g _{2, n}(v) function (4)

G wherein _{1, n}(v) and g _{2, n}(continuous function of v) all representing sweep velocity v is to satisfy g _{1, n}(v ₀)＞g _{2, n}(v ₀) relation;

g _{1, n}(v) and g _{2, n}(v) all meet the following conditions: the ratio that exists of abnormal marking is 1.0 * 10 ^-4Or still less, the ratio that exists of this abnormal marking is a ratio between abnormal marking quantity and normal labeled quantity, normal labeled satisfies the requirement of L/nT 〉=n-0.5 and the requirement that abnormal marking satisfies L/nT＜n-0.5, and wherein L is the length by each the reproduction mark that reproduces the record mark acquisition, and

v ₀Be that the selected ratio that exists that satisfies abnormal marking is 1.0 * 10 ^-4Or arbitrary scan speed still less.

5. according to the recording method of the optical recording media of claim 4, further comprise and suitably control length T as the last cooling pulse of m cooling pulse according to sweep velocity v _CPn

6. according to the recording method of the optical recording media of any in claim 4 and 5, g wherein _{1, n}(v) and g _{2, n}(at least one v) is the linear function of sweep velocity v.

7. recording method corresponding to the optical recording media of different recording speed comprises:

With the laser radiation medium with m pulsegroup, wherein each pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And

Scan described medium with laser with sweep velocity v and come on this medium record length to be the mark of nT, wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

Wherein:

Length T as the last cooling pulse of m cooling pulse _CPnWith length T as the last heating pulse of m heating pulse _LPnUse following function (1) to (4) to determine according to sweep velocity v respectively,

At v＜v ₀Scope in, T _CPn/ T=f _{1, n}(v) function (1)

At v 〉=v ₀Scope in, T _CPn/ T=f _{2, n}(v) function (2)

At v＜v ₀Scope in, T _LPn/ T=g _{1, n}(v) function (3)

At v 〉=v ₀Scope in, T _LPn/ T=g _{2, n}(v) function (4)

F wherein _{1, n}(v), f _{2, n}(v), g _{1, n}(v) and g _{2, n}(continuous function of v) all representing sweep velocity v is to satisfy f _{1, n}(v ₀)＞f _{2, n}(v ₀) and g _{1, n}(v ₀)＞g _{2, n}(v ₀) relation;

f _{1, n}(v), f _{2, n}(v), g _{1, n}(v) and g _{2, n}(v) all meet the following conditions: the ratio that exists of abnormal marking is 1.0 * 10 ^-4Or still less, the ratio that exists of described abnormal marking is the ratio of abnormal marking quantity and normal labeled quantity, normal labeled satisfies the requirement of L/nT 〉=n-0.5 and the requirement that abnormal marking satisfies L/nT＜n-0.5, and wherein L is the length by each the reproduction mark that reproduces the record mark acquisition, and

v ₀Be that the selected ratio that exists that satisfies abnormal marking is 1.0 * 10 ^-4Or arbitrary scan speed still less.

8. according to the recording method of the optical recording media of claim 7, f wherein _{1, n}(v) and f _{2, n}(at least one v) and g _{1, n}(v) and g _{2, n}(at least one v) is the linear function of sweep velocity v.

9. according to the recording method of the optical recording media of any in the claim 1 to 8, wherein function m=n/2 sets up when n is even number, and function m=(n-1)/2 establishment when n is odd number.

10. according to the recording method of the optical recording media of any in the claim 1 to 9, wherein, satisfy v _H/ v _L〉=2.4 and 0.4v _H/ v _L≤ v ₀≤ 0.8v _HFunction, wherein the maximum recording rate of this medium is by v _HThe all time low speed of expression and this medium is by v _LExpression.

11. an optical recording media, it can use according to the recording method of any in the claim 1 to 3 and carry out record,

Wherein can determine v in single meaning ground ₀, f _{1, n}(v) and f _{2, n}(information v) is by preformatting.

12. an optical recording media, it can use according to the recording method of any in the claim 4 to 6 and carry out record,

Wherein can determine v in single meaning ground ₀, g _{1, n}(v) and g _{2, n}(information v) is by preformatting.

13. an optical recording media, it can use according to the recording method of any in claim 7 and 8 and carry out record,

Wherein can determine v in single meaning ground ₀, f _{1, n}(v), f _{2, n}(v), g _{1, n}(v) and g _{2, n}(information v) is by preformatting.

14. the evaluation method corresponding to the optical recording media of different recording speed,

Wherein mark records on the optical recording media in the following manner:

With the laser radiation medium with m pulsegroup, wherein each pulsegroup comprises that all power is that heating pulse and the power of Pw is the cooling pulse of Pc, and wherein m is a natural number; And

Scan described medium with laser with sweep velocity v and come on this medium record length to be the mark of nT, wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

Described evaluation method comprises:

By differently changing length T as the last cooling pulse of m cooling pulse _CPnCarry out test record;

Reproduce the test record mark;

Measure and reproduce mark length L separately;

Counting satisfies the normal labeled and the abnormal marking that satisfies the requirement of L/nT＜n-0.5 of the requirement of L/nT 〉=n-0.5; And

Obtain abnormal marking and exist ratio to estimate the quality of optical recording media, it is the ratio of abnormal marking quantity and normal labeled quantity that there is ratio in this abnormal marking.

15. the evaluation method corresponding to the optical recording media of different recording speed,

Wherein optical recording media is direct overwrite medium, and mark records on this medium in the following manner:

With the laser radiation medium with m pulsegroup, wherein all to comprise heating pulse and power that power is Pw be the cooling pulse of Pc to each pulsegroup, and wherein m is a natural number; And

Come on this medium record length to be the mark of nT with laser at the described medium of scanning under the sweep velocity v, wherein n is 3 or bigger natural number, and T is the clock period, and satisfies the relation of m＜n,

And record mark is wiped free of in the following manner:

Use to have the not posting field of power as the laser radiation medium of the erasing pulse of Pe, described not posting field is the space between the mark, wherein satisfies the relation of Pw＞Pe＞Pc,

Described evaluation method comprises:

Carry out test record by differently changing power P e;

Reproduce the test record mark;

Measure and reproduce mark length L separately;

Counting satisfies the normal labeled and the abnormal marking that satisfies the requirement of L/nT＜n-0.5 of the requirement of L/nT 〉=n-0.5; And obtain abnormal marking and exist ratio to estimate the quality of described optical recording media, it is the ratio of abnormal marking quantity and normal labeled quantity that there is ratio in described abnormal marking.

16. according to the evaluation method of the optical recording media of any in claim 14 and 15,

Wherein by having 3T mark alternately under the situation of using n=3 and the pattern in 3T mark gap is carried out test record.

17. according to the evaluation method of the optical recording media of any in the claim 14 to 16, wherein sweep velocity is decided to be the maximum recording rate of described medium and the mean value of all time low speed.

18. according to the evaluation method of the optical recording media of any in the claim 14 to 16, wherein under all time low speed of described medium, by having 4T mark alternately under the situation of using n=4 and the pattern in 4T gap is carried out test record.

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