CN101091215A - Power determining method, single-sided multilayer optical disk, recording method, program, recording medium, and optical disk apparatus - Google Patents

Abstract

A power determining method is disclosed for determining the light emitting power of a light source upon recording information on an optical disk having plural rewritable recording layers, the method involving obtaining an optimum erasing power with respect to an optimum recording power by recording test data on the optical disk.

Description

Power is determined method, single face multiplayer optical disk, recording method, computer program, computer-readable medium and optical disc apparatus

Technical field

The present invention relates to be used to determine that but the power of the luminous power of the laser beam of recorded information on the CD with a plurality of regenerative recording layers determines method, can use this power to determine the single face multiplayer optical disk of method, the luminous power that uses this power to determine that method is determined comes the recording method and the optical disc apparatus of recorded information on CD, the power that is used for this optical disc apparatus is determined program, store the computer-readable medium of this class method, and the computer program that comprises this type of computer-readable medium.

Background technology

In recent years since, progress along with digital technology and data compression technique, the frequent use of people such as CD (compact disc) and DVD CDs such as (digital multi-purpose disks) are as being used for the recorded information medium of (for example music, photo and computer software are called " content ").In addition, along with the decline of this type of CD price, the optical disc apparatus that is configured to recorded information on this type of CD is becoming more and more universal.

Can dispose optical disc apparatus, with by irradiation on the video disc recording layer from the laser beam of light emitted and form the low-light point, on CD/from video disc recording/erasure information, wherein CD has helical orbit or the concentric circular tracks that forms thereon.Also can dispose optical disc apparatus, to come information reproduction based on light from the recording layer reflection.Optical disc apparatus can comprise: object lens; Optical system is used for the luminous flux from light emitted is directed to recording layer, and will be directed to predetermined light receiving position from the reflection flux of recording layer reflection; And optical pickup apparatus, for example comprise the fluorescence detector that places light receiving position.

Can record the information on the CD based on length and its combination of the mark/space areas with different reflectivity.When using optical disc apparatus on CD during recorded information, the luminous power of the light source of control optical disc apparatus is to enable forming marked region and white space in the pre-position of video disc recording layer.

For example, record the information in comprise specific alloy in recording layer as the situation on the CD-RW (for example CD-RW (CD-can rewrite), DVD-RW (DVD-can rewrite) or DVD+RW (DVD+ can rewrite)) of recording materials under, by this specific alloy being heated to first temperature, after this cooling off this specific alloy rapidly, form marked region to set up non-crystalline state.On the other hand, by this specific alloy being heated to second temperature (＜the first temperature), after this cooling off this specific alloy gradually, form white space to set up crystalline state.In this way, arrange marked region to have the reflectivity of the reflectivity that is lower than white space.By the luminous power of control light source, can realize aforesaid temperature control to specific alloy.When setting up marked region, luminous power can be arranged to a plurality of pulses, to stop influence from heat accumulation.The method of this type of control luminous power is called the multiple-pulse recording method.In addition, the maximal value of multiple-pulse luminous power is called recording power, and the minimum value of multiple-pulse luminous power is called bias power.In addition, the luminous power that is used to set up white space is called erase power (recording power＞erase power＞bias power).

In optical disc apparatus, before recorded information on the CD, write to test on the zone (being called PCA (power calibration area)) at presumptive test and write, to obtain optimum recording power, thereby can on desirable position, form mark and blank (for example, referring to No. the 3259642nd, Jap.P., No. the 3124721st, Jap.P. and Japanese publication publication number 2005-190643) with desirable length.This class process is called OPC (optimal power control) process.

Since it should be noted that in recent years, the inner capacities that writes down on CD increases, and then the demand of the CD of recording capacity with increase is also being increased.In this respect, a kind of method as the recording capacity that increases CD, developing a kind of CD, it is arranged from one side with rayed thereon, and comprise a plurality of recording layers (after this being called " single face multiplayer optical disk "), and be configured to optical disc apparatus that this type of single face multiplayer optical disk is handled in exploitation.

It should be noted that, in the single face multiplayer optical disk, must be with higher accuracy control luminous power.Along with growth of requirement to higher writing speed, estimating may be based on the optimum recording power of determining that by the power of routine method (for example disclosed method among No. the 3259642nd, Jap.P., No. the 3124721st, Jap.P. or the Japanese publication publication number 2005-190643) obtains, and realization can be with good record quality recording operation of recorded information stably on the single face multiplayer optical disk.

Summary of the invention

Finished the present invention in response to one or more above-mentioned problem, the invention provides a kind of power and determine method, but determined the suitable luminous power of light source when being used on CD recorded information with a plurality of regenerative recording layers.

The present invention also provides a kind of recording method and optical disc apparatus, but is used for stably carrying out on the CD with a plurality of regenerative recording layers high-quality record.

The computer program that the present invention also provides a kind of power to determine program, store the computer-readable medium of this class method and comprise this type of computer-readable medium, this power determines that program carried out by the control computer of optical disc apparatus, but and is configured to enable stably carry out high-quality record on the CD with a plurality of regenerative recording layers.

The present invention also provides a kind of can use the single face multiplayer optical disk that power of the present invention is determined method.

According to an embodiment of the present, be used on the CD with a plurality of regenerative recording layers determining during recorded information that the power of the luminous power of light source determines method but provide a kind of, the method includes the steps of:

By record test data on CD, obtain optimal erase power with respect to optimum recording power.

According to an aspect of present embodiment, but when on the CD with a plurality of regenerative recording layers during recorded information, record test data on CD, and obtain optimal erase power with respect to optimum recording power.More specifically, be identified for the optimum recording power and the optimal erase power of recorded information on CD.Correspondingly, can determine suitable luminous power, but be used for recorded information on CD with a plurality of regenerative recording layers.

According to another kind of embodiment of the present invention, a kind of recording method is provided, but be used for recorded information on CD with a plurality of regenerative recording layers, this recording method comprises following steps: utilize the optimal erase power by determining that according to the power of the embodiment of the invention method obtains, recorded information on CD.

According to an aspect of present embodiment, can be under optimum recording conditions on CD recorded information, thus, but can on CD, stably carry out high-quality record with a plurality of regenerative recording layers.

According to another aspect of the present invention, a kind of computer program is provided, comprise computer-readable medium, but the computer executable program that its storage is carried out by the control computer that is configured to the optical disc apparatus of recorded information on the CD with a plurality of regenerative recording layers, this program is carried out to realize following steps by control computer: by record test data on CD, obtain the optimal erase power with respect to optimum recording power.

An aspect according to present embodiment, in the time will determining that program is loaded in the predetermined memory and the start address of this program be arranged to programmable counter according to the power of the embodiment of the invention, according to the control computer of the optical disc apparatus of present embodiment can be on CD record test data, obtaining optimal erase power with respect to optimum recording power, thus on CD recorded information.Particularly, the control computer that can control optical disc apparatus according to the program of present embodiment is carried out and to be determined method according to the power of the embodiment of the invention.Correspondingly, but can on CD, stably carry out high-quality record with a plurality of regenerative recording layers.

According to a further aspect in the invention, provide the computer-readable medium of a kind of storage according to the program of the embodiment of the invention.

According to the one side of present embodiment, power determine is determined procedure stores in computer-readable medium, carrying out, thereby but can on CD, stably carry out high-quality record with a plurality of regenerative recording layers by computing machine.

According to another embodiment of the present invention, provide a kind of optical disc apparatus, but it is configured to recorded information on the CD with a plurality of regenerative recording layers, this device comprises:

Optimal power obtains the unit, is configured to record test data on CD, and obtains the optimal erase power with respect to optimum recording power; And

Record cell is configured to utilize optimal power to obtain the optimal erase power that the unit obtains, recorded information on CD.

One side according to present embodiment, optimal power obtains the unit and is configured to obtain optimal erase power with respect to optimum recording power, but with recorded information on CD with a plurality of regenerative recording layers, and and then record cell can on CD, stably carry out high-quality record.

According to another embodiment of the present invention, provide a kind of single face multiplayer optical disk, it comprises: but a plurality of regenerative recording layer;

Wherein preformatting is provided with value information at least one recording layer, and this is provided with value information and is used for obtaining optimal erase power according to the method for determining according to the power of the embodiment of the invention.

Description of drawings

From detailed description below in conjunction with accompanying drawing, above and other purposes, feature and advantage of the present invention as can be seen, wherein:

Fig. 1 shows the block scheme of the configuration of optical disc apparatus according to an embodiment of the invention;

Fig. 2 is the sectional view of single face multiplayer optical disk according to an embodiment of the invention;

Fig. 3 is the diagram of configuration of optical pickup apparatus of the optical disc apparatus of displayed map 1;

Fig. 4 is for describing about the modulation level of the embodiment of the invention and the diagram of asymmetry;

Fig. 5 is the process flow diagram of the first that shows the recording processing of carrying out on the optical disc apparatus according to Fig. 1 of an embodiment;

Fig. 6 is the process flow diagram of the second portion of the recording processing of carrying out on the optical disc apparatus of displayed map 1;

Fig. 7 is presented at the target modulation level that obtains in the recording processing of Fig. 5 and Fig. 6 and the diagram of the corresponding relation between the target record power;

Fig. 8 is presented at the target asymmetry that obtains in the recording processing of Fig. 5 and Fig. 6 and the diagram of the corresponding relation between the optimal erase power;

Fig. 9 is the process flow diagram of demonstration according to the first of the recording processing of the first modification embodiment of the recording processing of Fig. 5 and Fig. 6;

Figure 10 is the process flow diagram of demonstration according to the second portion of the recording processing of the first modification embodiment;

Figure 11 is presented at the target gamma value that obtains in the recording processing of Fig. 9 and Figure 10 and the diagram of the corresponding relation between the target record power;

Figure 12 is the process flow diagram of demonstration according to the first of the recording processing of the second modification embodiment of the recording processing of Fig. 5 and Fig. 6;

Figure 13 is the process flow diagram of demonstration according to the second portion of the recording processing of the second modification embodiment;

Figure 14 for show be used for example use of the present invention, as the diagram of the 1T strategy of Write strategy;

Figure 15 is for showing the diagram of the data that obtain in first and second example use of the present invention;

Figure 16 is for showing the diagram of the data that obtain in first example use;

Figure 17 is for showing the diagram of the data that obtain in the of the present invention the 3rd and the 4th example use;

Figure 18 is for showing the diagram of the data that obtain in the 3rd example use;

Figure 19 is for showing the diagram of the data that obtain in the of the present invention the 5th and the 6th example use;

Figure 20 is for showing the diagram of the data that obtain in the 5th example use;

Figure 21 is for showing the diagram of the first group of data that obtains in the 7th example use of the present invention;

Figure 22 is for showing the diagram of the second group of data that obtains in the 7th example use;

Figure 23 is for showing the diagram of the 3rd group of data that obtain in the 7th example use;

Figure 24 is for showing the diagram of the 4th group of data that obtain in the 7th example use;

Figure 25 is for showing the diagram of the 5th group of data that obtain in the 7th example use;

Figure 26 is for showing the diagram of the first group of data that obtains in the 8th example use of the present invention;

Figure 27 is for showing the diagram of the second group of data that obtains in the 8th example use;

Figure 28 for show depend on different erase powers be provided with condition, the diagram of jittering characteristic difference in the 1T strategy record;

Figure 29 for show depend on different erase powers be provided with condition, the diagram of asymmetry property difference in the 1T strategy record;

Figure 30 for show depend on different erase powers be provided with condition, the diagram of jittering characteristic difference in the 2T strategy record;

Figure 31 for show depend on different erase powers be provided with condition, the diagram of asymmetry property difference in the 2T strategy record;

Figure 32 is for showing the diagram of the corresponding relation between erase power, recording power and the shake;

Figure 33 is for showing the diagram of the corresponding relation between erase power, recording power and the modulation level;

Figure 34 is for showing the diagram of the corresponding relation between erase power, recording power and the asymmetry

Figure 35 is another diagram that shows the 1T policing parameter of Figure 14 in greater detail;

Figure 36 for show be on the power calibration area record respectively once, under the situation of ten times and 100 times, depend on diagram different erase powers, asymmetry difference;

Figure 37 is the diagram of the recording characteristic (shake) that is presented on the zone that is different from power calibration area, measures at optimal erase power; And

Figure 38 is for the close surface information layer of the CD of demonstration present embodiment and away from the recording characteristic difference between the surface information layer.

Embodiment

Following with reference to accompanying drawing detailed description the preferred embodiments of the present invention.

Fig. 1 is the block scheme of demonstration according to the configuration of the optical disc apparatus 20 of the embodiment of the invention.

Optical disc apparatus 20 shown in Figure 1 for example comprises: Spindle Motor 22 is used for rotating the conduct CD 15 of single face multiplayer optical disk according to an embodiment of the invention; Optical pickup apparatus 23; Seek motor 21 is used for driving optical pickup apparatus 23 along the balladeur train direction; Laser control circuit 24; Scrambler 25; Drive and Control Circuit 26; Reproducing signal treatment circuit 28; Buffer RAM 34; Buffer-manager 37; Interface 38; Flash memory 39; CPU40; And RAM41.Please note: the arrow shows signal shown in Figure 1 and the representative flow direction of information; But, those that arrow was represented shown in the connection between the block components shown in Figure 1 was not limited to.In addition, the optical disc apparatus 20 of supposing present embodiment is applicable to the single face multiplayer optical disk.

CD 15 shown in Figure 1 is for can rewrite single-side double-layer light disk (after this being called " two-layer phase change type optical disk ").In an example, CD 15 can comprise: the first substrate 15a, first information layer 15b, middle layer 15c, the second Information Level 15d and the second substrate 15e, as shown in Figure 2.In the following description, suppose that CD 15 is DVD type information recording carrier; But the invention is not restricted to this type of CD.

As shown in Figure 2, first information layer 15b comprises protective seam b3, the first reflection horizon b4 and heat dissipating layer b5 on the first lower protective layer b1, the first recording layer b2, first that arranges in the following order from the first substrate 15a, one side to middle layer 15c one side.The second Information Level 15d comprises the protective seam d3 and the second reflection horizon d4 on the second lower protective layer d1, the second recording layer d2, second that arranges in the following order to the second substrate 15e, one side from middle layer 15c one side.

Please note: in the single face multiplayer optical disk, preferably arrange non-position to have high-penetrability away from the Information Level of the Information Level of laser-beam irradiated face, and the thickness of taking measures to reduce light absorption on the metal level and reducing recording layer.As a result, on the Information Level away from the Information Level of laser-beam irradiated face, it is in the cards not enough to dispel the heat in non-placement.And then, when the crystallization rate of recording materials is fast, may be difficult to form mark by on recording materials, setting up non-crystalline state.Consider this type of problem, preferably use the Sb comprise approximate 70%Sb (antimony) and the eutectic component of Te (tellurium), as the recording materials of the Information Level of non-absciss layer farthest.For example, can use Ge-Sb-Te, In-Sb-Te, Ag-In-Sb-Te, Ge-In-Sb-Te, Ge-Sn-Sb-Te or Ag-In-Ge-Sb-Te as recording materials.In addition, for example can use Ge-Te, In-Sb, Ga-Sb or Ge-Sb.

Preferably, the thickness of the first recording layer b2 is 4-12nm.When the thickness of the first recording layer b2 during less than 4nm, have too many light transmission wherein, thereby the record susceptibility of the first recording layer b2 may degenerate, and it may be degenerated for the tolerance of record repeatedly.On the other hand, when the thickness of the first recording layer b2 during greater than 12nm, the light transmission of first information layer 15b may be too low, and then the record susceptibility of the second Information Level 15d may be degenerated.

Preferably, the thickness of the second recording layer d2 is 10-20nm.

Preferably, the thickness of the first reflection horizon b4 is 5-12nm.When the thickness of the first reflection horizon b4 during less than 5nm, the reflectivity of the first reflection horizon b4 may be degenerated, and may be difficult to guarantee the prearranged signal amplitude.When the thickness of the first reflection horizon b4 during greater than 12nm, the light transmission of first information layer 15b may be too low, and then the record susceptibility of the second Information Level 15d may be degenerated.Please note: preferably, the first reflection horizon b4 is made of Cu and Ag, to obtain good recording characteristic on the first recording layer b2.In an example, can use Cu and Ag by alloy form.In another example, can use the Cu of the small amount of impurities element that wherein comprises the 0.2-5.0 percentage by weight, at least a metallic element of this impurity element for from following group, selecting: for example, Mo, Ta, Nb, Zr, Ni, Cr, Ge and Au, thus reproduction stability and the reliability of first information layer 15b can be improved.

The second reflection horizon d4 not necessarily will resemble the first reflection horizon b4 to translucent, and can be made of any proper metal reflectance coating.The thickness of the second reflection horizon d4 can be approximately equal to the thickness in the reflection horizon of conventional single layer phase change type, preferably in the scope of 100-200nm.When the thickness of the second reflection horizon d4 during, possibly can't obtain radiating effect, and shake may be degenerated less than 100nm.When the thickness of the second reflection horizon d4 during, when forming the second reflectance coating d4, may produce the substantive crooked of substrate, and the mechanical property of CD may be degenerated greater than 200nm.

Last protective seam is configured to degeneration and the variation that (for example) prevents recording layer, and reinforcement combines with recording layer, and improves recording characteristic.Preferably, the material that is used for protective seam is to have the transparent material that good light permeability and fusing point are higher than recording layer.Please note: in conventional single layer phase change type, generally use ZnS-SiO ₂Be used for protective seam, and under this type of situation, blending ratio is preferably ZnS: SiO ₂=80: 20.But, in two-layer phase change type optical disk,,, and may be difficult to recorded information on first recording layer so heat radiation may realize deficiency because arrange first reflection horizon for thin.Thus, preferably use material as protective seam on first with thermal conductive resin; That is, preferably use thermal conductivity to be better than ZnS-SiO ₂Material.Particularly, can use (for example) metal oxide, for example ZnO, SnO ₂, Al ₂O ₃, TiO ₂, In ₂O ₃, MgO, ZrO ₂, TaO and Ta ₂O ₅Nitride, for example Si ₃N ₄, AlN, TiN, BN and ZrN; Sulfide, for example ZnS, IN ₂S ₃, and TaS ₄Carbonide, for example SiC, TaC, B ₄C, WC, TiC, ZrC; Diamond shape carbon; And combination.But please note: using under the situation of Ag as first reflection horizon, preferably, avoid depositing sulfide thereon, this is because Ag and S may interact to bring inconvenience.

Preferably, on first the thickness of protective seam b3 in the 3-30nm scope.When the thickness of protective seam b3 on first during less than 3nm, the light reflectivity of first information layer 15b may be too high, thereby may be difficult to guarantee the modulation level be scheduled to.When the thickness of protective seam b3 on first during greater than 30nm, the light reflectivity of first information layer 15b may be too low, thereby may be difficult to guarantee the prearranged signal amplitude.

Material about protective seam d3 on second in single layer phase change type, can use ZnS-SiO ₂, perhaps also can use other oxides, nitride and sulfide.Protective seam d3 has enough thickness on second because arrange, thus when recorded information on the second recording layer d2, can realize heat radiation fully, and irrelevant with the material of the second reflection horizon d4.But please note: using under the situation of Ag as the second reflection horizon d4, preferably will avoid depositing sulfide on the second upper protective film d3, this is because Ag and S may interact to bring inconvenience.In a kind of preferred embodiment, when using Ag, can between the protective seam d3 on second and the second reflection horizon d4, arrange the contact bed that constitutes by TiOC (for example thickness is 4nm) as the second reflection horizon d4.

Preferably on second the thickness of protective seam d3 in the scope of 3-30nm.When the thickness of protective seam d3 on second during less than 3nm, the record susceptibility may be degenerated.On the other hand, when the thickness of protective seam d3 on second during greater than 30nm, for example may heat build-up, thus cause jitter degradation.

Lower protective layer is configured to degeneration and the variation that (for example) prevents recording layer, and reinforcement combines with recording layer, and improves recording characteristic.Preferably, the material that is used for lower protective layer is to have the transparent material that good light permeability and fusing point are higher than recording layer.Please note: often use metal oxide, nitride, sulfide and carbonide.For example, can use (for example) metal oxide, for example ZnO, SnO ₂, Al ₂O ₃, TiO ₂, In ₂O ₃, MgO, ZrO ₂, TaO and Ta ₂O ₅Nitride, for example Si ₃N ₄, AlN, TiN, BN and ZrN; Sulfide, for example ZnS, IN ₂S ₃, and TaS ₄Carbonide, for example SiC, TaC, B ₄C, WC, TiC, ZrC; Diamond shape carbon; And combination.Please note: these materials can use separately, perhaps can use its potpourri.In addition, if necessary or wish, can in these materials, comprise impurity.Please note: often use ZnS-SiO ₂(be ZnS and SiO ₂Potpourri) as the material of lower protective layer, and in this case, blending ratio is preferably ZnS: SiO ₂=80: 20.ZnS-SiO ₂The extinction coefficient that has high index of refraction n and equal 0 substantially, thus the absorption efficiency of recording layer can be improved.In addition, ZnS-SiO ₂Coefficient of heat conductivity be little value, thereby can suitably control distributing of the heat that produces from light absorption.In this way, the temperature of recording layer can be brought up to its melt temperature.

Preferably, the thickness of the first lower protective layer b1 is in the 40-80nm scope.When the thickness of the first lower protective layer b1 during less than 40nm, the light transmission of first information layer 15b may increase, and it may be degenerated to the tolerance of record repeatedly.On the other hand; when the thickness of the first lower protective layer b1 during greater than 80nm; though can obtain to repeatedly the record good tolerability; but the light transmission of first information layer 15b may be degenerated; and when the deposition first lower protective layer b1, may produce the substantive crooked of substrate, thereby the mechanical property of CD may be degenerated.

Preferably, the thickness of the second lower protective layer d1 is in the 110-160nm scope.When the thickness of the second lower protective layer d1 during less than 110nm, the reflectivity of the second Information Level 15d may reduce, and possibly can't obtain the prearranged signal amplitude when reproducing.On the other hand, when the thickness of the second lower protective layer d1 during greater than 160nm, the light transmission of the second Information Level 15d may descend, and may produce substantive bending when second time diaphragm d1 of deposition in substrate, thereby the mechanical property of CD may be degenerated.

Preferably, heat dissipating layer b5 has big coefficient of heat conductivity, thereby when rayed is on it, cools off the first recording layer b2 rapidly.In addition, preferably, heat dissipating layer b5 has low absorptivity with respect to the irradiation light wavelength; That is, preferably, arranging heat dissipating layer b5 is transparent for irradiates light, thereby can be in enterprising line item of the second recording layer d2 and reproduction.In this respect, preferably, heat dissipating layer b5 comprises at least one in following: nitride, oxide, sulfide, carbonide or fluoride.For example, heat dissipating layer b5 can comprise AlN, Al ₂, SiC, SiN, IZO, ITO (IN ₂O ₃-SnO ₂), DLC (diamond-like-carbon) or BN.Please note: especially preferred IZO or ITO, and under the situation of using ITO preferably, comprise tin oxide by the percentage by weight of 1-10 in ITO.When the ratio of tin oxide greater than or during greater than above scope, the thermal conductivity of heat dissipating layer b5 and light transmission may be degenerated.In addition, in order to improve reliability, can add another element by the weight percentage ranges of 0.1-5.0.When the ratio of interpolation element during, possibly can't obtain the raising of reliability less than above scope.When the ratio of interpolation element during greater than above scope, absorptance may increase, and light transmission may reduce.

In addition, use at substitute I TO under the situation of IZO, may reduce the internal stress in the CD, thereby can prevent change in film thickness in time substantially.In a preferred embodiment, preferably in IZO and ITO, comprise IN by about 90% mol ratio ₂O ₃

Preferably, the thickness of heat dissipating layer b5 is in the 40-80nm scope.When the thickness of heat dissipating layer b5 during less than 40nm, the light transmission of first information layer 15b may descend, and thermal diffusivity may be realized deficiency.When the thickness of heat dissipating layer b5 during greater than 80nm, first information layer 15b light transmission may descend.

Preferably, arrange the first substrate 15a to allow fully to see through the irradiates light that is used to write down with information reproduction.The first substrate 15a can be made of the material that routine is used, for example glass, pottery or resin.Please note: consider its plasticity and cost, resin is especially preferred.As the specific examples of resin, can use polycarbonate resin, acrylic resin, epoxy resin, polystyrene resin, acrylic acid nitrile-styrene copolymerized resin, polyvinyl resin, acrylic resin, silicones, fluororesin, ABS resin or urethane resin.Please note: consider its plasticity, optical characteristics and cost, especially preferred such as polycarbonate resin and polymethylmethacrylate acryl resins such as (PMMA).Surface of first substrate 15a of deposition first information layer 15b is formed with concavo-convex pattern thereon on it, for example helicla flute or concentric groove.This concavo-convex pattern for example can form by jet moulding or photopolymer process.Preferably, arrange the thickness of first substrate in the 10-600 mu m range.

Please note:, can use the identical materials of the first substrate 15a for the second substrate 15e.Replacedly, can use being used to write down or the opaque material of irradiates light of information reproduction; That is, for example the first substrate 15a and the second substrate 15e can be made of different materials, and have different trough pattern.The thickness of the second substrate 15e is not limited to particular range particularly; But, preferably, arrange the thickness of the second substrate 15e to make the gross thickness of win the substrate 15a and the second substrate 15e can be approximated to be 1.2mm.

Preferably, arrange middle layer 15c to have, and consider its plasticity and cost, preferably use the material of resin as middle layer 15c for the low absorptance that is used to write down with the irradiation light wavelength of information reproduction.For example, can use the UV hardening resin, delay resin or hot reversible resin.The second substrate 15e and middle layer 15c for example can pass through jet moulding or photopolymer process, are formed with concavo-convex pattern thereon, for example helicla flute or concentric groove.Middle layer 15c is used for realizing the isolation between the first information layer 15b and the second Information Level 15d, and its thickness preferably is arranged in the 10-70 mu m range.When the thickness of middle layer 15c during, between Information Level, may crosstalk less than 10 μ m.On the other hand, when the thickness of middle layer 15c during greater than 70 μ m, on the second recording layer d2/spherical aberration may take place during from the second recording layer d2 recoding/reproduction information, thereby hinder recording operation or reproduce operation.

According to present embodiment, arrange the groove of CD 15, thereby with the similar mode of the groove of DVD+RW, by predetermined periodic oscillations, and can record the information on the CD 15 as ADIP information by phase modulation (PM).In the present embodiment, suppose that ADIP information comprises the various information of using in the recording processing described below.In other words, at least one of the ingress area of CD 15 or export area, preformatting is used to obtain the value information that is provided with of optimum recording power and optimal erase power.

Hereinafter, the method for making CD 15 is described.The method of making CD 15 comprises thin film deposition processes, initialization process and adhesion process.In exemplary fabrication process stream described below, suppose according to above order and carry out above technology (that is thin film deposition,, initialization and bonding).

In thin film deposition processes, form thereon on the surface of the first substrate 15a of concavo-convex pattern, deposit protective seam b3, the first reflection horizon b4 and heat dissipating layer b5 on the first lower protective layer b1, the first recording layer b2, first in the following order.After this, will be called " first recording member " by the structure that placement first information layer 15b on the first substrate 15a realizes.In addition, form thereon on the surface of the second substrate 15e of concavo-convex pattern, deposit protective seam d3 on the second reflection horizon d4, second, the second recording layer d2 and the second lower protective layer d1 in the following order.After this, structure that will the second Information Level 15d realizes by placing on the second substrate 15e is called " second recording member ".Please note: each layer can deposit by various vapour growth technologies (for example vacuum vaporization technology, sputtering technology, plasma CVD technology, ion plating process, electron beam vaporization technology).In these exemplary processes, sputtering technology is especially preferred, and this is that it can realize good throughput rate and good film quality because of (for example).Usually, in sputtering technology, when carrying out thin film deposition, introduce inert gas, for example argon.In one embodiment, for example oxygen or nitrogen can be mixed in this type of inert gas, to realize so-called reactive sputtering process.

In initialization process, irradiation energy light on first recording member and second recording member, for example laser beam, and realization initialization, the i.e. crystallization on recording layer surface.Because the energy of laser beam, a layer may be peeled off under the situation of (peeling off) in this initialization process; for example can the execute protection coating process; wherein spin coated (spin coat) UV resin, after this irradiation ultraviolet radiation on the UV resin on the heat dissipating layer b5 and the second lower protective layer d1 respectively.

In adhesion process, first recording member, second recording member, bind mutually with middle layer 15c.For example, can be coated with resin on one in the surface of heat dissipating layer b5 or the surface of the second lower protective layer d1, and can arrange the heat dissipating layer b5 and the second lower protective layer d1 to face mutually, so that first recording member and second recording member are sticked together with UV.Then, can irradiation ultraviolet radiation with the UV curing resin.In this way, can first recording member and second recording member be sticked together, to form CD 15 by middle layer 15c.

Please note: in an alternative embodiment, can before initialization process, carry out adhesion process.In this case, can first recording member and second recording member be sticked together, after this carry out initialization process at recording layer since the first substrate 15a, one side by middle layer 15c.

Refer back to Fig. 1, optical pickup apparatus 23 is configured to laser beam irradiation wanting in two recording layer b2 of CD 15 and d2 (after this is called " Visitor Logs layer ") on the accessed record layer, and receives from the light of CD 15 reflections.As shown in Figure 3, optical pickup apparatus 23 comprises: light source cell 51, coupled lens 52, optical splitter 54, object lens 60, convergent lens 58, light-receiving device PD and the drive system (not shown) that for example comprises focus actuator and tracking actuator that is used for driving object lens 60.

As shown in Figure 3, light source cell 51 comprises semiconductor laser LD as light source, and it for example launches that wavelength is the laser beam of 660nm.In the present embodiment, the maximum intensity transmit direction of supposing the laser beam of sending from light source cell 51 is shown in Figure 3+directions X.Collimation lens 52 is arranged at light source cell 51+X one side, and is configured to make the light that sends from light source cell 51 substantially parallel.

Optical splitter 54 is arranged at collimation lens 52+X one side.Optical splitter 54 is configured to allow the light of self-focus lens 52 to pass through, and tells from the light of CD 52 reflections on-Z direction.Optical splitter 54+X one side arranges the object lens of NA=0.65, and these object lens 60 be configured to will be by optical splitter 54 optical convergence to the Visitor Logs layer of CD 15.

Detect lens 58 be arranged at optical splitter 54-Z one side, and be configured to and will be converged on the light receiving surface of light-receiving device PD by the reflected light of on-Z direction, telling at optical splitter 54 places.Light-receiving device PD comprises a plurality of photo detectors, and its output is including (for example) the signal of swinging signal information, reproduction data message, focus error message and orbit error information.The photo detector of light-receiving device PD is configured to generate signal according to shift the light quantity of receiving by photoelectricity, and the signal that is generated is outputed to reproducing signal treatment circuit 28.

The focus actuator (not shown) is configured to respect to the focus direction corresponding with the optical axis direction of object lens 60, fine drive object lens 60.In the present embodiment, when the first recording layer b2 during corresponding to the Visitor Logs layer, object lens 60 are called as " first lens position " with respect to the optimal location of focus direction, and be called as " second lens position " with respect to the optimal location of focus direction when the second recording layer d2 during, object lens 60 corresponding to the Visitor Logs layer.

Follow the tracks of the actuator (not shown) and be configured to respect to the tracking direction corresponding, fine drive object lens 60 with the direction that is orthogonal to the track tangent line.

Describe hereinafter from the light of CD 15 reflections.

As the first recording layer b2 during, object lens 60 are placed first lens position corresponding to the Visitor Logs layer.In this way, can will be on the first recording layer b2 from the optical convergence of light source cell 51 emission by object lens 60.Then, be incident on the object lens 60 as flashlight from the first reflection horizon b4 light flux reflected.

As the second recording layer d2 during, object lens 60 are placed second lens position corresponding to the Visitor Logs layer.In this way, can will be on the second recording layer d2 from the optical convergence of light source cell 51 emission by object lens 60.Then, the light from second reflection horizon d4 reflection is incident on the object lens 60 as flashlight.

Refer back to Fig. 1, reproducing signal treatment circuit 28 is based on the output signal (being a plurality of photoelectricity transfer signals) of light-receiving device PD, obtains (for example) and waits upon clothes signal (for example focus error signal, track error signal), address information, synchronizing information, RF signal, modulation intelligence, gal code value information, asymmetry information and and the amplitude information of signal.

For example, the clothes signal of waiing upon that obtains at reproducing signal treatment circuit 28 places is output to Drive and Control Circuit 26, and address information is output to CPU40, and synchronizing signal is output to scrambler 25 and Drive and Control Circuit 26.In addition, reproducing signal treatment circuit 28 is configured to the RF signal is carried out such as processing such as decoding processing and error detection process.In addition, when detecting error, 28 pairs of RF signals of reproducing signal treatment circuit are carried out error correction and are handled.Then, the signal storage after reproducing signal treatment circuit 28 will be handled by buffer-manager 37 is reproduced data in buffer RAM 34 conducts.In addition, the address information that comprises in reproducing data is output to CPU40.

Reproducing signal treatment circuit 28 sends modulation intelligence, gal sign indicating number information, asymmetrical information and and signal amplitude information to CPU40.

With reference to Fig. 4, the reflectivity of establishing 14T crystallization blank is expressed as I14H, and the reflectivity of 14T amorphous mark is expressed as I14L, and then modulation level M is defined by following formula (1):

Modulation level M=(I14H-I14L)/I14H (1)

In addition, the reflectivity of establishing 3T crystallization blank is expressed as I3H, and the reflectivity of 3T amorphous mark is expressed as I3L, and then asymmetry A is defined by following formula (2):

Asymmetry A=(I14H+I14L-I3H-I3L)/2 (I14H-I14L) (2)

Refer back to Fig. 1, Drive and Control Circuit 26 generates the drive signal that is used for drive system based on the servosignal from reproducing signal treatment circuit 28, and the signal that generates is outputed to optical pickup apparatus 23.In this way, can realize tracking Control and focus control operation.In addition, Drive and Control Circuit 26 is based on the order from CPU40, and generation is used to drive the drive signal of seek motor 21, and the drive signal that is used for drive shaft motor 22.The motor drive signal that Drive and Control Circuit 26 generates is outputed to seek motor 21 and Spindle Motor 22 respectively.

Buffer RAM 34 temporary transient storages are such as the data data such as (reproduction data) that will be recorded in the data (record data) on the CD 12 and reproduce from CD 15.The I/O of data in the buffer-manager 37 management buffer RAM 34.

Scrambler 25 is based on the order from CPU40, record data by buffer-manager 37 retrieval storages in buffer RAM 34, and carry out the signal retrieved such as modulation and, be used for the write signal of CD 15 with generation to processing such as the attached error correction sign indicating numbers of this signal.In the present embodiment, the write signal that is generated is output to laser control circuit 24.

The luminous power of laser control circuit 24 control semiconductor laser LD.For example, in recording operation, laser control circuit 24 generates the drive signal that is used for semiconductor laser LD based on the characteristics of luminescence of write signal, record condition and semiconductor laser LD.

Interface 38 is a bi-directional communication interface, be used for realizing interface with higher-level device 90 (for example personal computer), and can the conformance with standard interface scheme, ATAPI (the attached packet interface of AT), SCSI (small computer system interface) or USB (USB (universal serial bus)).

Flash memory 39 storage (for example) is by the program of the code description that can be read by CPU40 and the characteristics of luminescence of semiconductor laser LD.

CPU40 controls the operation of each unit of optical disc apparatus 20 according to program stored in flash memory 39, and stores the data that are used to realize this type of control in RAM41 and buffer RAM 34.

(recording processing)

Hereinafter, with reference to Fig. 5 and Fig. 6 the recording processing of carrying out when higher-level device 90 is sent record request, at optical disc apparatus 20 places is described.Please note: Fig. 5 and Fig. 6 are for showing the process flow diagram of the Processing Algorithm sequence that CPU40 carries out.

In response to the record request of receiving from higher-level device 90, will be set to the programmable counter of CPU40 corresponding to the start address of the program of the process flow diagram of Fig. 5 and Fig. 6, and opening entry is handled.

At first,, give an order, with according to predetermined linear velocity (perhaps angular velocity) rotary CD 15, and send signal to the reproducing signal treatment circuit and received record request from higher-level device 90 with report to Drive and Control Circuit 26 in step 401.

Then, in step 403, from the record request signal, extract specified address, and definite Visitor Logs layer is that the first recording layer b2 still is the second recording layer d2.

Then, in step 405, from light disk retrieval ADIP information, and obtain between erase power Pe and the recording power Pp ratio epsilon, target modulation level Mtarget, be used to obtain multiplication coefficient ρ and the target asymmetry Atarget of optimum recording power Ppo, and it is stored among the RAM41.

Then,, the initial value of recording power Pp is set in step 407, and notice laser control circuit 24 these values of setting.

Then, in step 409, calculate the ratio between erase power Pe and the recording power Pp that makes and to equal the erase power Pe of ε, and notice laser control circuit 24 is somebody's turn to do the erase power Pe that calculates.

Then, in step 411, the signal of giving an order writes record test data on the zone with indication in the prearranged test in Visitor Logs layer place.And then, by laser control circuit 24 and optical pickup apparatus 23, record test data on test zone.

Then, in step 413, determine to test to write whether finish.If test writes not finishing, then negate to determine, and this processing moves to step 415.

In step 415, predetermined variable Δ is added on the recording power Pp, this processing after this turns back to step 409.

Please note: repeating step 409,411,413 and 415, until obtaining to determine certainly in step 413.

Write fashionablely when having finished the test data of utilizing a plurality of booking situation power P p, obtain to determine certainly in step 413, and this processing moves to step 417.

In step 417, by reproducing signal treatment circuit 28, reproduce that test of record test data writes the zone on it, to obtain modulation intelligence.

Then, in step 419, determine recording power Pp shown in Figure 7 and the corresponding relation between the modulation level M.

Then, in step 421,, obtain recording powers of laser beam (Ptarget) corresponding to target modulation level Mtarget based on recording power Pp shown in Figure 7 and the corresponding relation between the modulation level M.

Then, in step 423, based under show formula (3), calculate recording power optimal value (Ppo):

Ppo＝ρ×Ptarget (3)

Then, in step 431, recording power is set to optimal value Ppo, and the set recording power optimal value Ppo of notice laser control circuit 24.

Then, in step 433, the initial value of ratio epsilon is set.

Then,, calculate ε * Ppo in step 435, and the value of notifying laser control circuit 24 to be calculated, as erase power Pe.

Then, in step 437, the signal of giving an order writes record test data on the zone with indication in the prearranged test in Visitor Logs layer place.And then, by laser control circuit 24 and optical pickup apparatus 23, record test data on test zone.

Then, in step 439, determine to test to write whether finish.If test writes not finishing, then negate to determine, and this processing moves to step 441.

In step 441, predetermined variable Δ e is added on the ratio epsilon, this processing after this turns back to step 435.

Please note: repeating step 435,437,439 and 441, until obtaining to determine certainly in step 439.

Write fashionablely when the test data of having finished a plurality of predetermined values of utilizing different mutually ε, obtain to determine certainly in step 439, and this processing moves to step 443.

In step 443, by reproducing signal treatment circuit 28, reproduce that test of record test data writes the zone on it, to obtain asymmetry information.

Then, in step 445, based on asymmetry information, determine the corresponding relation between erase power Pe and the asymmetry A, the example of this relation shows in Fig. 8.This erase power Pe is set to the erase power optimal value.

Then, in step 447,, obtain erase power Peo corresponding to target asymmetry Atarget based on erase power Pe shown in Figure 8 and the corresponding relation between the asymmetry A.

Then, in step 501, to Drive and Control Circuit 26 signal of giving an order, thus can be near corresponding to the target location of specified address the formation beam spots.And then carry out seek operation.Please note: under the situation that does not need seek operation, can skip this step.

Then, in step 503, record condition is set.For example, recording power is set to optimum recording power Ppo, and erase power is set to optimum recording power Peo.

Then,, allow record, thus, can pass through scrambler 25, laser control circuit 24 and optical pickup apparatus 23, utilize optimum recording conditions, at specified address identifying recording layer in step 505.

Then, in step 507, determine whether record is finished.If record is not finished, the definite result who then to negate, and at the fixed time after the section, carry out this once more and determine.If record is finished, then obtain sure definite result, and end record is handled thus.

Please note: in above-mentioned recording processing, use modulation level M to obtain the optimal value of recording power Pp.But, the invention is not restricted to this type of embodiment, for example, in another embodiment, can utilize gal code value γ but not modulation level M, obtain the optimal value of recording power Pp, as Fig. 9 and shown in Figure 10.Please note: in the process flow diagram of Fig. 9 and Figure 10, the identical treatment step of describing with reference Fig. 5 and Fig. 6 has identical Reference numeral, and the descriptions thereof are omitted.The feature of the recording processing that is different from previously described embodiment of present embodiment is described hereinafter.

In the present embodiment, at step 405A, from CD 15 retrieval ADIP information, and ratio epsilon, target gamma value γ target, multiplication coefficient ρ and target asymmetry Atarget between acquisition erase power Pe and the recording power Pp.Please note: in CD 15 preformatting the part of target gamma value γ target as ADIP information.

At step 417A, by reproducing signal treatment circuit 28, reproduce that test of record test data writes the zone on it, to obtain gal code value information.

Then, at step 419A, based on gal code value information, determine the corresponding relation between recording power Pp and the gal code value γ, the example of this relation shows in Figure 11.

Then, at step 421A,, obtain target record performance number Ptarget corresponding to target gamma value γ target based on the corresponding relation between recording power Pp shown in Figure 11 and the gal code value γ.

In addition, please note: in recording processing, utilize asymmetry to obtain the optimal value of erase power Pe according to the foregoing description.But, the invention is not restricted to this type of embodiment, for example, in another embodiment, can utilize from the output signal that is subjected to light PD that obtain with amplitude signal, obtain the optimal value of erase power Pe, shown in the process flow diagram of Figure 12 and Figure 13.Please note: in the recording processing of Figure 12 and Figure 13, have identical Reference numeral with the identical treatment step of describing about previously described embodiment, and the descriptions thereof are omitted.The feature of the recording processing that is different from previously described embodiment of present embodiment is described hereinafter.

In the present embodiment, at step 405B, from CD 15 retrieval ADIP information, and obtain between erase power Pe and the recording power Pp ratio epsilon, target modulation level Mtarget, multiplication coefficient ρ and such as coefficients such as σ and β.Please note: in CD 15 preformatting factor sigma and β a part as ADIP information.

In step 451, the recording power optimal value is set to recording power Pp, and the set recording power Pp of notice laser control circuit 24.

Then, in step 453, the signal of giving an order writes record test data on the zone with indication in the prearranged test in Visitor Logs layer place.In this way, can use optimum recording power Ppo record test data.

Then, in step 455, determine the initial value of ε.

Then,, calculate ε * Ppo in step 457, and the value of notifying laser control circuit 24 to be calculated, as erase power Pe.

Then, in step 459, the signal of giving an order is wiped the part that the test of having write down test data on it writes the zone with indication.In this step, utilize erase power Pe, carry out so-called DC and wipe.

Then, in step 461, determine whether erase operation is finished.If erase operation is not finished, then negate to determine, and this processing move to step 463.

In step 463, on the predetermined variable Δ ε value of being added to ε, and this processing turns back to step 457.

Please note: repeating step 457,459,461 and 463, until obtaining to determine certainly in step 461.

When having finished the erase operation of a plurality of predetermined values of utilizing different mutually ε, obtain to determine certainly in step 461, and this processing moves to step 465.

In step 465, reproduce the test of having carried out erase operation on it and write the zone, and obtain amplitude information with signal.

Then, in step 467, determine and the amplitude Wdc of signal and the corresponding relation between the erase power.

Then, in step 469,, obtain from posting field and amplitude Wo signal by reproducing signal treatment circuit 28.

Then, in step 471, based on and the amplitude Wdc of signal and the corresponding relation between the erase power, obtain erase power Pedc corresponding to α * Wo.

Then, in step 473, calculate β * Pedc, and result of calculation is set to erase power optimal value Peo.Then, this processing moves to step 501.

Please note: can in optical disc apparatus 20 1 sides factor alpha and β be set based on the type or the test data erase operation result of CD.

(example use)

Hereinafter example use of the present invention will be described; But, please note to the invention is not restricted to these examples.In the following description, supposes and use so-called 1T strategy (referring to Figure 14), and transition linear velocity is 9.2m/s that the reproduction transition linear velocity is 3.83m/s, and reproducing power is 1.4mW.In addition, suppose that the DVD sprinter (sheet stock supply sputter equipment) that uses Balzers is sputter equipment.

1, first uses

As the first substrate 15a, diameter 12cm, thickness 0.565mm and the one side be formed with on the polycarbonate resin of continuous swinging chute by track space 0.74 μ m thereon; spray by magnetron, in Ar gas, deposit in the following order: as the ZnS first lower protective layer b1, thickness 60nm (80% mol ratio)-SiO ₂(20% mol ratio) is as the Ag first recording layer b2, thickness 8nm _0.5In _4.5Sb ₆₉Te ₂₄Ge ₂, as SnO protective seam b3, thickness 7.5nm on first ₂(90% mol ratio)-Ta ₂O ₅(10% mol ratio), as the Cu first reflection horizon b4, thickness 10nm (98.9% weight ratio)-Mo (1.1% weight ratio), and as In heat dissipating layer b5, thickness 60nm ₂O ₃(90% mol ratio)-ZnO (10% mol ratio).

As second substrate, diameter 12cm, thickness 0.6mm and the one side be formed with on the polycarbonate resin of continuous swinging chute by track space 0.74 μ m thereon; spray by magnetron; in Ar gas, deposit in the following order: as Ag second reflection horizon, thickness 140nm, as the SnO of protective seam d3, thickness 15nm on second ₂(90% mol ratio)-Ta ₂O ₅(10% mol ratio) is as the Ag second recording layer d2, thickness 15nm _0.5In _4.5Sb ₆₉Te ₂₄Ge ₂, and as ZnS (80% mol ratio)-SiO of the second lower protective layer d1, thickness 140nm ₂(20% mol ratio).

UV cured resin (for example KAYARAD DVD-576M of Nippon Kayaku company limited) is coated onto the surface of heat dissipating layer b5, and the second lower protective layer d1 is bonded to heat dissipating layer b5.Then from the first substrate 15a, one side irradiation ultraviolet radiation with the UV curing cured resin, and the UV curing resin layer is arranged among the 15c of middle layer.In this way, make two-layer phase change type optical disk.In the present example, arranging the thickness of middle layer 15c is 55 μ m.

Then, be used for carrying out the isolated plant of initialization process,, and on the second recording layer d2 and the first recording layer b2, carry out initialization process in the following order from the first substrate 15a, one side illuminating laser beam.In the present example, initialization process relates to the object lens that utilize NA=0.55, will from semiconductor laser (vibration wavelength: 810 ± 10nm) irradiation laser beam converge on the respective record layer.The initialization condition of the second recording layer d2 is set, make rotary CD under CLV (constant linear speed) pattern, have the linear speed of 3m/s, feed quantity that 36 μ m/ change, go up and the initialization power of 1050mW in the radial position (with the distance of rotation center) of 23-58mm.The initialization condition of the first recording layer b2 is set, makes rotary CD under CLV (constant linear speed) pattern, have the linear speed of 3m/s, feed quantity that 50 μ m/ change, in the radial position of 23-58mm and the initialization power of 700mW.Please note: carried out thereon after the initialization process, the light transmission of first information layer is 37.4%.

In the present example, as Ttop=Tmp=0.188T, dTop=0.6T, dTera=0.3T and use the 1T strategy on first information layer 15b, to test to write fashionable, obtain as shown in figure 15 modulation level and the corresponding relation between the recording power Pp.When target modulation level and multiplication coefficient are confirmed as Mtarget=0.47 and ρ=1.36, Ptarget=22mW then, Ppo=29.2mW.When recording power being fixed as above recording power optimal value Ppo and distribute ε to measure asymmetry, obtain data shown in Figure 16.When target asymmetry is confirmed as Atarget=0.05, can on corresponding erase power value, obtain suitable jitter value 7.6%.Please note: shake expression is when utilizing section level (slice level) that mark and blank reflectivity are binarized as binary signal, with respect to the time variation on the border of the binary signal of clock.

2, second use

Use the two-layer phase change type optical disk of describing in first example, and with first example in the similar mode of description on first information layer 15b, test and write.In this way, obtain as shown in figure 15 the gal code value and the corresponding relation between the recording power Pp.When target gamma value and multiplication coefficient are confirmed as γ target=1.9 and ρ=1.36, Ptarget=22mW, Ppo=29.2mW, and as first example, obtain suitable jitter value 7.6%.

3, the 3rd use

In the present example, arranging the thickness of the first lower protective layer b1 is 75nm, and the thickness of arranging the first recording layer b2 is 7.5nm, and arranging the thickness of protective seam b3 on first is 3nm, and the thickness of arranging the first reflection horizon b4 is 7nm.Please note: the CD that uses in other architectural features of the two-layer phase change type optical disk of using in the present embodiment and the previously described example identical.Please note: carried out thereon after the initialization process, the light transmission of first information layer 15b is 43.7%.

In the present example, as Ttop=Tmp=0.2T, dTop=0T, dTera=0.3T and use the 1T strategy on first information layer 15b, to test to write fashionable, obtain as shown in figure 17 modulation level and the corresponding relation between the recording power Pp.When target modulation level and multiplication coefficient are confirmed as Mtarget=0.46 and ρ=1.29, Ptarget=24mW then, Ppo=31.0mW.When recording power being fixed as above recording power optimal value Ppo and distribute ε to measure asymmetry, obtain data shown in Figure 180.When target asymmetry is confirmed as Atarget=-0.07, can on corresponding erase power value, obtain suitable jitter value 8.1%.

4, the 4th use

In the present example, use with the 3rd example in the identical two-layer phase change type optical disk used, and with the 3rd example in the similar mode of description on first information layer 15b, test and write.In this way, obtain as shown in figure 17 the gal code value and the corresponding relation between the recording power Pp.When target gamma value and multiplication coefficient are confirmed as γ target=1.7 and ρ=1.29, Ptarget=24mW then, Ppo=31.0mW, and obtain suitable jitter value 7.6%.

5, the 5th use

In the present example, arranging the thickness of the first lower protective layer b1 is 75nm, and the thickness of arranging the first recording layer b2 is 7.5nm, and arranging the thickness of protective seam b3 on first is 5nm, and the thickness of arranging the first reflection horizon b4 is 7nm.Please note: the CD that uses in other architectural features of the two-layer phase change type optical disk of using in the present embodiment and first example identical.Please note: carried out thereon after the initialization process, the light transmission of first information layer 15b is 43.4%.

In the present example, as Ttop=Tmp=0.2T, dTop=0T, dTera=0.3T and use the 1T strategy on first information layer 15b, to test to write fashionable, obtain as shown in figure 19 modulation level and the corresponding relation between the recording power Pp.When target modulation level and multiplication coefficient are confirmed as Mtarget=0.48 and ρ=1.26, Ptarget=23mW then, Ppo=29.0mW.When recording power being fixed as above recording power optimal value Ppo and distribute ε to measure asymmetry, obtain data shown in Figure 20.When target asymmetry is confirmed as Atarget=-0.05, can on corresponding erase power value, obtain suitable jitter value 8.6%.

6, the 6th use

In the present example, use with the 5th example in the identical two-layer phase change type optical disk used, and write on first information layer 15b, to test with the similar mode of the 5th example.In this way, obtain as shown in figure 19 the gal code value and the corresponding relation between the recording power Pp.When target gamma value and multiplication coefficient are confirmed as γ target=1.7 and ρ=1.26, Ptarget=23mW then, Ppo=29.0mW, and obtain suitable jitter value 8.6%.

7, the 7th use

In the present example; as the first substrate 15a, diameter 12cm, thickness 0.6mm and the one side be formed with on the polycarbonate resin of continuous swinging chute by track space 0.74 μ m thereon; spray by magnetron, in Ar gas, deposit in the following order: as the ZnS first lower protective layer b1, thickness 60nm (80% mol ratio)-SiO ₂(20% mol ratio) is as the Ag first recording layer b2, thickness 8nm ₂In ₄Sb ₆₉Te ₂₃Ge ₂, as In protective seam b3, thickness 5nm on first ₂O ₃, as the Cu first reflection horizon b4, thickness 8nm ₉₅Ag ₅, and as In heat dissipating layer b5, thickness 60nm ₂O ₃(90% mol ratio)-ZnO (10% mol ratio).

As the second substrate 15e, diameter 12cm, thickness 0.6mm and the one side be formed with on the polycarbonate resin of continuous swinging chute by track space 0.74 μ m thereon; spray by magnetron; in Ar gas, deposit in the following order: as the Ag second reflection horizon d4, thickness 120nm; as TiOC contact bed, thickness 4nm, as the SnO of protective seam d3, thickness 15nm on second ₂(90% mol ratio)-Ta ₂O ₅(10% mol ratio) is as the Ag second recording layer d2, thickness 17nm ₂In ₄Sb ₆₉Te ₂₃Ge ₂, and as ZnS (80% mol ratio)-SiO of the second lower protective layer d1, thickness 140nm ₂(20% mol ratio).Please note: to bind and initialization process with the similar mode of first example.

In the present example, as Ttop=Tmp=0.22T, dTop=0T, dTera=0.3T and use the 1T strategy on first information layer 15b, to test to write fashionable, Ppo=28mW.In turn, by recording power be set to Ppo (=28mW) test and write, test write carry out on the zone DC wipe, simultaneously determined erase power Pe ± change by the definite erase power Pe in ε=0.196 in 10% the preset range.Then, measure from self-test write that the light of regional reflex obtains, from the output signal that is subjected to light PD and amplitude Wdc signal.In this way, can obtain Figure 21 and data shown in Figure 22.Please note: corresponding to non-recorded part and amplitude Wo signal that writes the zone is 8mV.In the present example, be located at signal amplitude Wdc equal under the situation of 2 * Wo (α=2) of erase power to(for) the correspondence of ε (=0.186) be expressed as Pedc (=5.22mW), then will multiply by the value that 1.1 (β=1.1) obtain and be set to optimal erase power Peo (=5.7mW (ε=0.204)) by erase power Pedc.When on a plurality of tracks, repeating ten recording operations under these conditions, can obtain suitable jitter value 8%, shown in Figure 23 and 24.

Figure 25 is presented under the situation of the Pe that is called condition A constant (being Pe=5.7) and equals corresponding recording power allowance under the situation of Pp * ε (being ε=0.0) at the Pe that is called condition B.As can be seen from the figure, under condition A and B, when recording power depart from recording power optimal value Ppo (=28mW) time, the shake aggravation.

8, the 8th use

In the present example, use with first example in the identical two-layer phase change type optical disk used.As Ttop=Tmp=0.188T, dTop=0.6T, dTera=0.3T and use the 1T strategy on first information layer 15b, to test to write fashionable, Ppo=29.2mW.In turn, by recording power be set to Ppo (=29.2mW) test and write, test write carry out on the zone DC wipe, simultaneously determined erase power Pe ± change by the definite erase power Pe in ε=0.226 in 10% the preset range.Then, measuring amplitude Wdc is to obtain data shown in Figure 26.Please note: corresponding to non-recorded part and amplitude Wo signal that writes the zone is 8mV.In the present example, be located at signal amplitude Wdc equal under the situation of 2 * Wo (α=2) of erase power to(for) the correspondence of ε (=0.212) be expressed as Pedc (=5.22mW), then will multiply by the value that 1.1 (β=1.1) obtain and be set to optimal erase power Peo (=5.7mW (ε=0.204)) by erase power Pedc.When on a plurality of tracks, repeating ten recording operations under these conditions, can obtain suitable jitter value 7.8%, as shown in figure 27.

9, the 9th use

Use following two-layer phase change type optical disk in the present example, wherein the first recording layer b2 is by Ag _0.2In _3.5Sb _69.8Te ₂₂Ge _4.5Constitute, thickness is 7.5nm, and protective layer thickness is 3nm on first, and the thickness of the first reflection horizon b4 is 7.5nm.Please note: the CD that uses in other architectural features of the two-layer phase change type optical disk of using in the present embodiment and first example identical.Under the condition of Ttop=Tmp=0.188T, dTop=0.375T, dTlast=-0.438T, dTera=0.375T, and use next on first information layer 15b, the test of 1T strategy to write.Please note: the expression of the negative sign "-" of dTlast value front is with respect to standard time clock inhibit signal (referring to Figure 35) in time.

Utilize optimum recording power Ppo (=38mW), the executive logging operation once on three tracks in test writes zone (PCA), after this utilize based on the erase power Pe that the value ε (=0.182) of format (record) calculates on the presumptive area of dish in advance, carrying out erase operation on the posting field.Then, can track executive logging (for example) once, ten times or 100 times, simultaneously change erase power Pe successively, with the asymmetry of measurement result in recording operation.Figure 36 be presented in the recording operation by on test zone, write down respectively once, the diagram of test result that ten times and 100 times are obtained.As can be seen from Figure 36, depend in the recording operation, established the difference of asymmetry at the number of times of the enterprising line item of test zone.Figure 37 equals the situation of 0 (zero), diagram by utilizing corresponding ε value, operating the corresponding shake that produces at the regional enterprising line item that is different from test zone for indication substantially for asymmetry.As can be seen from Figure 37, when Ppo=38mW and ε=0.172 and 0.182 (Peo=6.5mW and 6.9mW), the jitter value that can obtain to wish, and have nothing to do in the number of times of the record that in recording operation, on test zone, carries out in order to obtain suitable ε value.

In above-mentioned example use, the jitter value that can obtain to wish, and can on CD, stably carry out high-quality record.

Figure 28 for show when utilize the 1T strategy continuous during the enterprising line item of first information layer 15b ten times, for the diagram of the respective record margin of power of situation A and B, wherein constant (=6mW) situation, situation B equals the situation of Pp * ε (ε=0.214) to situation A corresponding to Pe corresponding to Pe.Figure 29 is the diagram of the corresponding asymmetry that obtains among demonstration situation A and the B.From these figure as can be seen, when recording power Pp depart from optimum recording power Ppo (=28mW) time, situation B compares with situation A, the degree that shake worsens is bigger.In addition, when recording power Pp greater than optimum recording power Ppo (=28mW) time, situation B compares with situation A, the degree that asymmetry worsens is bigger.

Figure 30 for show when utilize the 2T strategy continuous during the enterprising line item of first information layer 15b ten times, for the diagram of the respective record margin of power of situation A and B, wherein constant (=6mW) situation, situation B equals the situation of Pp * ε (ε=0.214) to situation A corresponding to Pe corresponding to Pe.Figure 31 is the diagram of the corresponding asymmetry that obtains among demonstration situation A and the B.As can be seen, the same from these figure with the example of above-mentioned use 1T strategy, when recording power Pp depart from optimum recording power Ppo (=28mW) time, situation B compares with situation A, asymmetry is bigger with the degree that shake worsens.

As mentioned above, haveing nothing to do in using 1T still is the 2T strategy, compares with the situation that equals at Pe to write down under the condition of Pp * ε, under the situation of utilizing constant erase power Pe to write down, can guarantee wideer recording power allowance, and the record quality that can obtain to wish.In other words, for example when having determined fixedly optimal erase power Pe,, also can carry out stable information record (referring to Figure 28 and Figure 30) even have under the situation about slightly departing from optimum recording power Ppo.

Figure 32 is the diagram of corresponding relation between displayed record power P p, erase power Pe and the shake.As shown in the figure, the point that Pe equals Pp * ε on it with its on realize that the point of minimum jitter is not corresponding.Figure 33 is the diagram of corresponding relation between displayed record power P p, erase power Pe and the modulation level.Figure 34 is the diagram of corresponding relation between displayed record power P p, erase power Pe and the asymmetry.

As can be seen from the above description, in optical disc apparatus 20 according to an embodiment of the present invention, CPU40 and realized optimal power acquiring unit according to an embodiment of the present invention by the program that CPU40 carries out.But for example, in other embodiments, at least a portion of the processing of being carried out by CPU40 that program realized can be realized that perhaps all processing can be realized by hardware by hardware.

In addition, in the above-described embodiments, scrambler 25, laser control circuit 24 and optical pickup device 23 have realized the record cell according to an embodiment of the present invention.

In addition, in the above-described embodiments, flash memory 39 has been realized the computer-readable medium according to an embodiment of the present invention, and its storage for example comprises the various programs of program (power is determined program) of execution graph 5 and Fig. 6, Fig. 9 and Figure 10 or Figure 12 and treatment step shown in Figure 13 of being used for.Please note: according to an embodiment of the present invention, this class method may be implemented as computer program.

In addition, above-mentioned recording processing step can realize determining method and recording method according to the power of the embodiment of the invention.

According to a kind of embodiment, in above-mentioned optical disc apparatus 20, at first, on CD 15, test writing by changing recording power and erase power, record test data simultaneously so that the ratio epsilon between recording power and the erase power equals the mode of predetermined value.Then, write the result according to test, acquisition is corresponding to the recording power of target modulation level Mtarget (predetermined modulation level) or target gamma value γ target (predetermined gamma value), after this, the recording power that is obtained be multiply by multiplication coefficient ρ (pre-determined factor), to obtain optimum recording power Ppo.

Then, optimum recording power Ppo is set to employed recording power, and tests and write by change erase power Pe, while record test data.Then, write the result, obtain erase power Peo, and the erase power Peo that is obtained is set to optimal erase power corresponding to target asymmetry (predetermined symmetry) according to test.

Replacedly, the test that utilizes optimum recording power Ppo at CD 15 write write down test data on the zone after, utilize different erase powers to write the zone and wipe the test data that is write down from test.Then, according to write from test that the zone obtains with signal amplitude Wdc, obtain corresponding to α * (never posting field obtain with signal amplitude Wo) erase power Pedc, and β * Pedc is set to optimal erase power Peo.

Then, use the optimum recording power Ppo and the optimal erase power Peo that are obtained, user data on CD 15.In this way, but can on CD, stably carry out high-quality record with a plurality of regenerative recording layers.Please note: by utilizing the present invention, can obtain useful effect, especially under following situation: the Visitor Logs layer is corresponding to the first recording layer b2 of the plane of incidence of the more close laser beam of sending from light source cell 51 in position.

Please note: in the above description, use double-deck phase-change optical recording medium as from the side single face multiplayer optical disk of irradiates light thereon.For example, can make double-deck phase-change optical recording medium by piling up two Information Levels (each all comprises recording layer and metallic reflector at least) and utilizing the UV cured resin that these two Information Levels are combined.Be used for realizing that the bound fraction of the combination between the Information Level can be corresponding to the separation layer of optically isolating these two Information Levels (being called as " middle layer " in the above description).Preferably, be arranged in Information Level (for example first information layer) with respect to the close side of the photoirradiated surface of CD, it is made of suitable material, has suitable thickness, so that enough light (laser beam that is used for recoding/reproduction information) can penetrate wherein, to reach the Information Level away from side (for example second Information Level) that is positioned at respect to photoirradiated surface.

Please note: in double-deck phase-change optical recording material, unless the abundant part of institute's illuminating laser beam can penetrate the Information Level (first information layer) near side, otherwise can not be on the recording layer away from the Information Level (second Information Level) of side/or from its recoding/reproduction information fully.In this respect, in first information layer, preferably use thin translucent reflective layer, and preferably arrange transparent material thereon with high-termal conductivity as the reflection horizon.On the other hand, second Information Level needn't have high light transmittance, therefore, for example, with the same in conventional individual layer optical recording media, can use the reflection horizon of thicker relatively metallic reflector as second Information Level.

Please note:, on the recording layer of phase-change optical recording medium, realize recording operation by illuminating laser beam on the phase-change recording medium, rapid cooling recording material and the phase of recording materials changed into non-crystalline state to set up mark from crystalline state.By on recording materials, shine continuous light and lentamente cooling recording material realize erase operation to realize crystalline state.

In double-deck phase-change optical recording medium, arrange second Information Level to comprise metal level with high-termal conductivity, Ag layer for example, thereby the layer that can realize having the good heat radiating characteristic, and can accurately carry out the formation of amorphous mark/wipe.Preferably, the first information layer of double-deck phase-change optical recording medium comprises relatively thin semi-transparent metal layer (for example approximate 10nm), to realize good light transmittance.In addition, preferably, first information layer comprises the transparent heat-sink that is arranged on the semi-transparent metal layer, to improve heat dissipation characteristics.In this way, can promote record and wipe.But the heat dissipation characteristics of first information layer still is inferior to the heat dissipation characteristics of second Information Level with the enough metallic reflectors of thickness.Particularly, used heat can not easily be scattered and disappeared, thereby can not successfully write down or wipe (for example referring to Figure 38).

Figure 38 be presented to the rewritable optical recording medium use under the situation of multiple-pulse recording method, near the side Information Level and away from the diagram of the shake at side Information Level place, wherein the intensity modulated by luminous power, form mark by the multiple-pulse that between recording power Pp and bias power Pb, replaces, the continuous light that has erase power Pe by irradiation is wiped mark (forming blank), and the ratio (Pe/Pp=ε) between arrangement recording power Pp and the erase power Pe is constant.In the present example, suppose near side Information Level (first information layer) locate, ε=0.18, and locate away from side Information Level place (second Information Level), ε=0.409.

From the example of Figure 38 as can be seen, between the first information layer and second Information Level, because the difference of its layer structure, be specially the difference of its metal layer thickness, can obtain power bracket (margin of power) difference of good jitter characteristics on it.Particularly, in Figure 38, compare, in second Information Level, can obtain the margin of power of broad with first information layer.In this case, in second Information Level,, then can pass through formula Peo=ε * Ppo, determine optimal erase power Peo simultaneously in case determined optimum recording power Ppo.But, for first information layer with narrower margin of power, can not be by only determining to reach good recording characteristic by optimum recording power Ppo.Correspondingly, in embodiment of the present invention, change ratio epsilon to obtain optimal erase power Peo.

Please note: according to the CD 15 of the embodiment of the invention therein preformatting be used for obtaining the configuration information of optimum recording power and optimal erase power, thereby can accurately obtain optimum recording power and optimal erase power rapidly.

In addition, please note: in the above description, the CD 15 of present embodiment is described to DVD type CD.But the invention is not restricted to this type of embodiment, and can be used as the CD of other types equally, for example utilize the CD of future generation of the light of 405nm wavelength.

In addition, please note: in the embodiment of the invention described above, CD 15 is described to have two recording layers (Information Level).But the invention is not restricted to this type of embodiment, and can comprise three or more a plurality of recording layer (Information Level) being used for CD of the present invention.In this case, can obtain beneficial effect, especially when the Visitor Logs layer when being different from the position away from the recording layer of the plane of incidence of the laser beam of sending from light source cell 51.

In addition, please note: in the above description, determine that according to the power of the embodiment of the invention program is stored in the flash memory 39; But this class method can be stored in the storage medium of other types, for example CD, magneto-optic disk, DVD, storage card, USB storage or floppy disk.In this case, can in flash memory 39, load program by the transcriber (perhaps special purpose interface) that is used for the corresponding stored medium according to present embodiment.In another example, can pass through network, for example LAN, in-house network or the Internet are sent to flash memory 39 with the program of present embodiment.In other words, can in any medium, store or carry the program of present embodiment, to be loaded in the flash memory 39.

In addition, please note: in the above-described embodiments, optical pickup apparatus 23 comprises a semiconductor laser; But the invention is not restricted to this type of embodiment, and for example can comprise a plurality of semiconductor lasers in optical pickup apparatus, its emission has the luminous flux of different wave length.In this case, for example can in optical pickup apparatus, comprise at least one in following: the semiconductor laser of the luminous flux of the approximate 405nm of emission wavelength, the semiconductor laser of the luminous flux of the approximate 660nm of emission wavelength, and the semiconductor laser of the luminous flux of the approximate 780nm of emission wavelength.In other words, can be the optical disc apparatus of polytype CD of being used to meet various criterion according to the optical disc apparatus of an embodiment of the present invention.In this case, but optical disc apparatus can be used to have the single face multiplayer optical disk of a plurality of regenerative recording layers at least.

As can be seen from the above description, the embodiment in the scope of the invention comprises that power determines that method, recording method, optical disc apparatus, single face multiplayer optical disk and power determines program.Determine that according to the power of the embodiment of the invention method can suitably be used to determine the suitable luminous power when but recorded information is on the CD with a plurality of regenerative recording layers.But recording method and optical disc apparatus according to the embodiment of the invention can enable stably to carry out high-quality record on the CD with a plurality of regenerative recording layers.Single face multiplayer optical disk according to the embodiment of the invention can be for determining the suitable medium of method to its power of using present embodiment.Determine that according to the power of the embodiment of the invention but program makes optical disc apparatus can stably carry out high-quality record on the CD with a plurality of regenerative recording layers.This power determines that program can be implemented in any computer-readable medium, is used for carrying or storage computation machine executable instruction or data structure therein.This power determines that program also can be implemented in the computer program that comprises this type of computer-readable medium.Computer-readable medium can be for can be by any available medium of general or special purpose computer visit.As an example and non-limitingly, this type of computer-readable medium can comprise physical storage medium, for example RAM, ROM, EEPROM, CD-ROM, other optical disc memory apparatus or other magnetic storage apparatus, perhaps can be used for the form carrying of computer executable instructions or data structure or store desirable program code means and can be by any other medium general or the special purpose computer visit.For example this type of medium can comprise wireless carrier signal.Information is transmitted or when offering computing machine, computing machine suitably is considered as computer-readable medium with these connections when communicate to connect (perhaps hardwired, wireless or its combination) by network or other.Thus, any this type of connection all suitably is called computer-readable media.Above combined situation also should be comprised in the scope of computer-readable media.Computer executable instructions comprises that (for example) makes multi-purpose computer, special purpose computer or treatment facility carry out the instruction and the data of specific function or function group.

Though show and described the present invention with reference to preferred embodiment, to those skilled in the art, after reading and having understood this instructions, obviously can expect various equivalents and modification.The present invention comprises all this type of equivalent and modification, and only is defined by the claims.

The Japanese patent application that the present invention is based on Japanese patent application 2005-338801 number of the Japanese patent application submission of submitting on September 30th, 2005 on November 24th, 2005-285715 number 1 and submitted on Dec 9th, 2005 2005-364190 number, and require its right of priority, its full content incorporates this paper by reference.

Claims (13)

1. but determine that the power of the luminous power of light source determines method when being used on the CD with a plurality of regenerative recording layers recorded information for one kind, the method includes the steps of:

By record test data on CD, obtain optimal erase power with respect to optimum recording power.

2. power as claimed in claim 1 is determined method, wherein:

The step of described acquisition optimal erase power comprises: utilizing optimum recording power after the record test data, to utilize different erase powers on CD, wipe test data; And, obtain optimal erase power according to amplitude from the signal that obtains from its zone of wiping test data of CD.

3. power as claimed in claim 2 is determined method, wherein:

Optimal erase power equals the erase power that uses when the amplitude of the described signal that obtains since its zone of wiping test data is established the predetermined relationship of amplitude of the signal that obtains with not posting field from CD.

4. power as claimed in claim 1 is determined method, wherein:

The step of described acquisition optimal erase power comprises: utilize the optimum recording power record test data, change employed erase power simultaneously; Based on the result of record test data, obtain erase power corresponding to predetermined asymmetry; And the erase power that is obtained is set is optimal erase power.

5. power as claimed in claim 1 is determined method, further comprises the step that will carry out before the step of described acquisition optimal erase power, comprising:

Write, simultaneously change employed recording power and erase power testing on the CD so that the ratio between employed recording power and the erase power equals the mode of predetermined value;

Result based on test writes obtains the recording power corresponding to predetermined modulation level; And

Multiply by pre-determined factor by the recording power that will be obtained, obtain optimum recording power.

6. power as claimed in claim 1 is determined method, further comprises the step that will carry out before the step of described acquisition optimal erase power, comprising:

Write, simultaneously change employed recording power and erase power testing on the CD so that the ratio between employed recording power and the erase power equals the mode of predetermined value;

Result based on test writes obtains the recording power corresponding to predetermined gamma value; And

Multiply by pre-determined factor by the recording power that will be obtained, obtain optimum recording power.

7. power as claimed in claim 1 is determined method, wherein

The step of described acquisition optimal erase power comprises: in being different from recording layer the position farthest on it incident from the plane of incidence of the light of light source away from the recording layer of recording layer at least one, record test data.

8. but one kind is used for the recording method of on the CD with a plurality of regenerative recording layers recorded information, and this recording method comprises following steps:

Utilization is determined the optimal erase power that method obtains by power, recorded information on CD, and this power determines that method comprises following steps: by record test data on CD, obtain the optimal erase power with respect to optimum recording power.

9. computer program, comprise computer-readable medium, but the computer executable program that its storage is carried out by the control computer that is configured to the optical disc apparatus of recorded information on the CD with a plurality of regenerative recording layers, this program is carried out to realize following steps by control computer:

By record test data on CD, obtain optimal erase power with respect to optimum recording power.

10. computer-readable medium, but the computer executable program that its storage is carried out by the control computer that is configured to the optical disc apparatus of recorded information on the CD with a plurality of regenerative recording layers, this program is carried out to realize following steps by control computer:

By record test data on CD, obtain optimal erase power with respect to optimum recording power.

11. an optical disc apparatus, but be configured to recorded information on CD with a plurality of regenerative recording layers, and this device comprises:

Optimal power obtains the unit, is configured to record test data on CD, and obtains the optimal erase power with respect to optimum recording power; And

Record cell is configured to utilize optimal power to obtain the optimal erase power that the unit obtains, recorded information on CD.

12. a single face multiplayer optical disk comprises:

But a plurality of regenerative recording layers;

Wherein preformatting is provided with value information at least one recording layer, and this is provided with value information and is used for by record test data on described at least one recording layer, obtains the optimal erase power with respect to optimum recording power.

13. single face multiplayer optical disk as claimed in claim 12, wherein

In the ingress area of described at least one recording layer and in the export area at least one, the described value information that is provided with of preformatting.

Images