TWI277961B - Optical storage medium, optical recording method and optical recording apparatus - Google Patents

Abstract

The invention relates to an optical storage medium, optical recording method and optical recording apparatus. That is, the invention provides an optical recording medium by which satisfactory recording characteristics are obtained even if recording speed is accelerated and overwrite recording characteristics for once or a plurality of times are excellently maintained. A phase transition type optical recording medium A is provided with a substrate 1 and a recording layer 3 having a track for recording information. Materials constituting the recording layer are initialized at a crystallized state so that an amplitude value of a difference signal (tracking detection signal) between both receiving signals obtained by receiving reflection light when the recording layer is irradiated with laser light at an off track state while rotating the optical recording medium by a group of first and second light receiving elements arranged opposite to the track becomes smaller than a saturation value of the amplitude value.

Description

1277961 (1) Description of the Invention [Technical Field] The present invention relates to an optical recording medium for recording, erasing, and reproducing information of light (e.g., laser light), and an optical recording optical recording apparatus. In particular, the present invention relates to an optical recording medium recording method and optical recording which are excellent in rewriting characteristics when optical recording is performed at a high linear velocity (high-speed) in a rewritable phase change recording medium for optical discs and light. [Prior Art] A phase change type optical recording medium is, for example, a CD-DVD-RW or a DVD-RAM in recent years, which is capable of rewriting information media. Among them, a DVD-RW or a DVD-RAM system is mainly used in an example. Recording and rewriting of information-intensive information. In addition to good recording characteristics, phase-change light bodies also require good rewriting. One-phase change optical recording media is capable of recording, reproducing, or eliminating power. The recording layer on the substrate from which the surface irradiated by the laser light is formed on the bottom surface to the ground dielectric layer, the recording layer, the dielectric layer and the reflective layer is formed immediately after being formed by sputtering or the like. Therefore, in order to achieve a crystallization state at the time of product shipment, laser light irradiation or the like has evolved. The recording of a rewritable phase change optical recording medium has been conventionally recorded. As follows. With the above described configuration of the phase change type optical recording method and an exit and into a card speed, etc.), a light -RW, even if the image recording medium of buildings. In addition to using less order. Recording reflectance high reflection line initiation method positive media, -5- (2) (2)1277961 At the time of recording, the recording pulse is applied (irradiated) to the recording layer by the laser light of the recording power, and the recording layer is melted and quenched. An amorphous recording mark is formed. The reflectance of the recording mark is lower than the reflectance of the recording layer in the crystalline state, so that the recording mark can be optically recorded as information to be read. In a state where the recording mark is eliminated, laser light having an irradiation power (elimination power) smaller than the recording power can be used, and the recording layer becomes a crystalline state by a temperature higher than the crystallization temperature, thereby eliminating the recording. Mark and rewrite. Japanese Patent No. 2962052 (Patent Document 1) proposes an initializing method for specifying the reflectance of an unrecorded portion and the reflectance of a recording portion for the purpose of improving the recording density and improving the repeat recording characteristics; There is no record of the initiation method of the optical recording medium recorded with respect to the high line speed. In addition, the inventors of the present invention have confirmed that the rewriting characteristics (especially the characteristics of the first rewriting) of the high-speed recording of the high recording density medium in recent years are not made only by the conditions described in Patent Document 1. full. In Japanese Patent Laid-Open Publication No. 2003-62 62 No. 1 (Patent Document 2), it is proposed to specify the most appropriate elimination by DC laser for the purpose of recording good jitter characteristics or rewriting characteristics at high line speeds. An optical recording medium having a maximum cancellation rate obtained by power and a difference between the elimination rates of powers less than this. In addition, Japanese Laid-Open Patent Publication No. 2003-228 84 (Patent Document 3) proposes a recording method that uses the change relationship between the cancellation power at the time of mark formation and the reflectance between marks as a fundamental and specifies the most appropriate power cancellation. And optical recording media. However, the present inventors have confirmed that only -6 - (3) 1277961 is not able to obtain a high linear velocity recording, specifically a 4x speed (linear velocity: 14 m/s) of a DVD, under the conditions proposed in Patent Document 3. Full rewrite features (especially the characteristics of the first rewrite). [Patent Document 1] Japanese Patent Laid-Open Publication No. JP-A No. 2003-228841 (Patent Document 3) JP-A-2003-228841. The problem to be solved by the invention] As described above, in the conventional optical recording medium and optical recording method, there is a so-called jitter that is greatly deteriorated when performing one rewriting and is shaken when rewriting more than several hundred times. The problem of deterioration of characteristics occurs, and it is not easy to sufficiently ensure the rewriting characteristics at high line speed recording. Therefore, the present invention has been made to solve the above problems, and an object thereof is to provide a high recording speed which is high in speed (for example, a recording speed of 4/double speed (linear speed··14 m/s) or higher). An optical recording medium, an optical recording method, and an optical recording apparatus which are excellent in recording characteristics and which can satisfactorily maintain one or more times of rewriting recording characteristics. 「 [Means for Solving the Problems] In order to solve the above problems, the present invention provides the following optical recording methods (a) to (h), an optical recording apparatus, and an optical recording medium. (a): an optical recording medium characterized by: a phase change type optical recording medium (A) comprising: a substrate (1); and a recording layer having a track for recording (4) 1277961 information (3) Further, the material constituting the recording layer is such that the amplitude 値(SO) of the tracking detection signal obtained by rotating the optical recording medium while receiving the reflected light when the recording layer is irradiated with the off-track state to emit the laser light is smaller than the saturation thereof. The crystallization state of 値(S 1 ) is initiated. (b) The optical recording medium according to (a), wherein the tracking detection signal is received by the first and Φ second light receiving element groups (341a to 341d) disposed opposite to the track. The difference between the two signals received by the reflected light. (c) The optical recording medium according to (a) or (b), wherein the amplitude 値 divided by the saturation enthalpy is greater than 0.6 and less than 1.0. (d): an optical recording medium characterized by: a phase change optical recording medium (A) comprising: a substrate (1); and a recording layer (3) for recording information; and further, the recording layer The reflectance of the unrecorded portion obtained by applying the light having a predetermined DC canceling power to the unrecorded portion which does not have the information of the recording layer at a time, and which is irradiated with the reproducing light, is the predetermined DC. Eliminating the power, when sequentially increasing from the power 0, exhibiting a characteristic that changes with a predetermined curve; the predetermined curve has a linear portion in which the reflectance is slightly constant; and the reflection subsequent to the straight portion a first curved portion having an increased rate; and a second curved portion having a reduced reflectance; and a reflectance R0 at a bending point (Q 1 ) which is a boundary between the straight portion and the first curved portion 1 The reflectance of the peak point (Q2) of the boundary between the curve part and the second curve part (5) 1277961 R1, the characteristic of the following formula (1) is established: 〇· 〇3 $ (( RO ) / R0 ) $ 0.1 5 ... (1 ). (e) The optical recording medium according to (d), wherein the material of the recording layer is initialized in a crystallized state in which the reflectance in one track is slightly determined. (f): an optical recording method characterized by recording a recording information in a recording layer (3) of a phase change recording medium (A), wherein the optical recording medium causes the recording layer to be recorded at one time The unrecorded portion of the information of the recording layer is applied to the unrecorded reflectance obtained by irradiating the reconstructed light with light having a predetermined stream canceling power, and becomes the predetermined DC canceling power, which is sequentially increased from the power. When the time is large, the predetermined curve is changed according to a predetermined curve: the first curve portion in which the reflectance is a constant straight line and the reflectance of the straight portion is increased; and the rate is decreased. In addition, the reflectance R0 of the bending point (Q 1 ) which is the boundary between the straight line portion and the line portion is the peak point (Q2) of the boundary between the front curve portion and the second curve portion. When R1 is reversed, the following formula (1) is established: 〇·〇3 S (( R〇) / RO ) S 0.15 (1 ): The optical recording method described above includes changing the aforementioned recording information to generate modulated data. Modulation step; root Generating a mark length generation step of the required mark length according to the prior variable data and generating a record (Pw) formed at a rise from the elimination (Pe) and greater than the aforementioned cancellation power and less than the aforementioned elimination according to the aforementioned mark length The power between the base power (Pb) of the power R1 - is composed of a type of light and light, and the direct recording part is split; the part; the reflection 1 curve; the 1st rate R1 - •• the modulation: the power Recording pulse (6) (6) 1279961 rushing (Tt()p, Tmp) and a recording pulse pattern formed by the cancellation of the aforementioned substrate power to the aforementioned cancellation power (Tel) for the recording layer The recording pulse pattern is irradiated with recording light, and a recording step of recording the recording mark indicating the recording information is recorded; and the recording step is performed when the erasing power of the recording pulse pattern is Pe and the erasing power of the bending point is p1 The elimination power Pe: 0.5SPe/PlS1.0 (2) is established using the following formula (2). (g) an optical recording apparatus characterized in that an optical recording apparatus records recording information on a recording layer (3) of a phase change optical recording medium (A), wherein the optical recording medium causes the recording layer to The unrecorded portion that records the information of the recording layer at a time does not reflect the reflectance of the unrecorded portion obtained by irradiating the reconstructed light with a predetermined DC canceling power, and becomes the predetermined DC canceling power. When the power 〇 is sequentially increased, the characteristic is changed by a predetermined curve; the predetermined curve has a linear portion in which the reflectance is slightly constant; and the reflectance subsequent to the linear portion is increased. a first curved portion; and a second curved portion having a reduced reflectance; and a reflectance R〇 at a bending point (Q1) which is a boundary between the straight portion and the first curved portion, and the first curved portion and When the reflectance R1 of the peak point (Q2) of the boundary between the second curved portions, the characteristic of the following formula (1) is established: 〇.〇3$((111-RO) / R0 ) ^0.15...(1); The aforementioned optical recording device package An encoder (42) for generating the modulated data by modulating the record information; generating a mark length generating portion (41) of the required mark length based on the modulated data; and generating the mark length based on the mark length From -10- (7) 1277961, the power (Pe) starts to rise and is greater than the recording power (Pw) greater than the aforementioned cancellation power and the base power (Pb) less than the aforementioned cancellation power (Tt〇P) And Tmp) and a recording pulse pattern formed by the cancellation of the aforementioned power to the cancellation power (T ei ), and recording and displaying the recording for the recording layer 'incorporating the recording pulse pattern 'irradiated recording light' The recording unit of the information recording mark (400); wherein the recording unit is configured to eliminate the φ power of Pe in the recording pulse pattern and the power of the bending point is P 1 , the following public formula (2) is used. (2) ° (h): (g) The optical recording device described in the present invention is characterized in that: the display includes the display of the aforementioned cancellation power Pe. The identification information storage unit (451); the system using the recording section stored in said storage unit before the identification information resulting from the elimination of power. ι 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果 效果[Embodiment] [Best Embodiment of the Invention] Fig. 1 shows a manufacturing apparatus 3 for manufacturing a phase change optical recording medium or a manufacturing apparatus by manufacturing equipment 00. - (8) (8)1277961 The map of Cheng. In the manufacturing apparatus 100 (manufacturing process), a phase change type optical recording medium is manufactured, and the start-up apparatus 200 (initiation process) is initialized to the phase change type optical recording medium. The phase change optical recording medium that has undergone the initialization process is shipped as the optical recording medium A. As the phase change type optical recording medium, a medium which can repeatedly rewrite information such as a phase change type optical disc such as a DVD-RW or a light card can be used. In the following description, a phase change type optical disc (optical recording medium A) is used as an embodiment of the phase change optical recording medium. However, even if it has the same configuration as the optical card or the like other than this, It is needless to say that the phase change type optical recording medium can also be applied to the present invention. <<Structure of Optical Recording Medium>> Fig. 2 is an enlarged cross-sectional view showing an optical recording medium A according to an embodiment of the present invention. The optical recording medium A, as a basic structure thereof, sequentially stacks the first protective layer 2, the recording layer 3, and the second protective layer on the substrate 1 on which the incident surface 1a on which the laser light is incident on the recording/reproducing or eliminating laser light is bottomed. 4. The reflective layer 5 and the third protective layer 6. As the material of the substrate 1, various transparent synthetic resins, transparent glass, or the like can be used. In order to avoid the influence of adhesion of dust or damage of the substrate 1, etc., the transparent substrate 丨 is used to record information on the recording layer 3 from the incident surface 1 a side of the substrate 1 by the collected laser light. Examples of the material of the substrate 1 include glass, polycarbonate, polymethyl methacrylate, polyolefin resin, epoxy resin, and polyimide resin. Special -12- (9) 1277961 It is preferably a polycarbonate resin because the optical birefringence and hygroscopicity are small and the molding becomes easy. The thickness of the substrate 1 is not particularly limited. However, when considering compatibility with a DVD, it is preferably 0.01 mm to 〇6 mm, and even in it, it is preferably 〇.6 mm (DVD) The full thickness is 1.2mm). In this case, if the thickness of the substrate 1 is less than 0.01 mm, it is easily affected by dust even in the state where φ recording is performed by laser light that is focused by the incident surface 1a side of the substrate 1. reason. Further, if it is not limited to the full thickness of the optical recording medium, it can be practically in the range of 1 mm to 5 mm. If it is 5 mm or more, it is not easy to increase the number of openings of the lens of the receiving lens, and the size of the spot for irradiating the laser light becomes large, so that it is not easy to pick up the recording density. The substrate 1 may be flexible or rigid. The flexible substrate 1 is used in an optical recording medium having a strip shape, a sheet shape, or a card shape. The rigid substrate 1 is used in a card-shaped or disc-shaped optical recording medium. The first protective layer 2 and the second protective layer 4 exhibit the effect of protecting the substrate 1 and the recording layer 3 due to heat due to deformation of the substrate 1 and the recording layer 3 due to heat during recording. It is an effect of improving the brightness of the signal during reproduction due to the interference effect of the optical. Preferably, the first protective layer 2 and the second protective layer 4 are transparent to the laser light for recording/reproducing or eliminating, respectively, such that the refractive index n is at 1.9 S η $ 2.3. Further, in terms of thermal characteristics, the material of the first protective layer 2 and the second protective layer 4 is preferably S i 〇 2, SiO, ZnO, Ti 〇 2, Ta 2 〇 5, Nb 2 〇 5, Zr〇2, oxidation of MgO Temple—13- (10) 1277961, sulfides of ZnS, In2S3, TaS4, etc., and monomers and mixtures of carbides such as SiC, TaC, WC, TiC, etc. Even in this case, the mixed film of ZnS and SiO 2 is particularly difficult to cause deterioration in recording sensitivity, C / N, elimination rate, and the like even if it is repeated due to recording or elimination. Further, the first protective layer 2 and the second protective layer 4 may not be the same material or composition, and may be composed of a different material. The thickness of the first protective layer 2 is in the range of about 5 nm to 500 nm. Further, since the substrate 1 or the recording layer 3 is not easily peeled off, and defects such as cracking are unlikely to occur, the thickness of the first protective layer 2 is preferably in the range of 20 nm to 300 nm. When it is thinner than 20 nm, it is not easy to ensure the optical characteristics of the disc, and when it is thicker than 300 nm, it is deteriorated in productivity. Further, it is more desirable to be in the range of 3 0 n m to 8 0 n m. Since the recording characteristics such as C / N and the elimination rate are good and the rewriting can be performed many times stably, the thickness of the second protective layer 4 is preferably in the range of 5 nm to 40 nm. When the thickness is thinner than 5 nm, the heat of the recording layer 3 is not easily secured. Therefore, the optimum recording power is increased, and when the thickness is more than 40 nm, the overwrite characteristics are deteriorated. More preferably, it is in the range of 8 nm to 2 0 n m. The recording layer 3 is an Ag—In—Sb—Te alloy or a Ge—In—Sb—Te alloy, or the Ge—In—Sb—Te alloy contains at least one of Ag or Si, A1, Ti, Bi, and Ga. Any alloy layer. In addition, remember

The layer thickness of the recording layer 3 is preferably 10 nm to 25 nm. When the layer thickness is thinner than 1 Onm, the crystallization speed is lowered, and the high-speed recording characteristics are deteriorated. When the thickness is further increased to 2 5 n m, a large laser power is required at the time of recording. -14- (11) 1277961 An interface layer bonded to one side or both sides of the recording layer 3 may be provided. The material used as the interface layer is importantly free of sulfur species. When a material containing a sulfur substance is used as the interface layer, sulfur contained in the interface layer is diffused into the recording layer 3 due to repetition of overwriting, and the recording characteristics are deteriorated, so that it is not preferable. In addition, it is also unsatisfactory in terms of the so-called elimination characteristics. The material of the interface layer is preferably a material containing at least one of a nitride, an oxide, and a carbide. Specifically, it preferably contains tantalum nitride, tantalum nitride, aluminum nitride, aluminum oxide, and oxidation. A material of at least one of zirconium, an oxidation group, chromium oxide, tantalum carbide, and carbon. Further, these materials may contain oxygen, nitrogen, hydrogen, and the like. The nitride, the oxide, and the carbide may not be a stoichiometric composition, and may be excessive or insufficient in nitrogen, oxygen, or carbon. There is a state in which the interface layer is not easily peeled off to improve the durability of the storage layer, etc., and the state of the interface layer is improved. The material of the reflective layer 5 is a metal having a light-reflective A1, Au, Ag, or the like, an alloy containing one or more kinds of metals as a main component or an additive element composed of a semiconductor, and These metals are mixed with a metal compound such as a metal nitride such as Al or Si, a metal oxide or a metal chalcogenide. Even in this case, since light reflectivity can be made high and heat conductivity is high, it is preferable to use a metal such as A, Au, or Ag, and an alloy containing these :$: genus as a main component. As an example of the alloy, generally, at least one element such as Si, Mg, Cu, Pd, Ti, Cr, Hf, Ta, Nb, Mn, Zr, or the like is mixed in A1, or Cr, Ag is mixed in Au or Ag.

/〇N -15- (12) 1277961

At least one element such as Cu, Pd, Pt, Ni, Nd, In, Ca, or the like. However, in the state in which high-speed recording is considered, it is preferable to use a metal or alloy having Ag having a particularly high thermal conductivity as a main component in terms of recording characteristics. However, in the state where the reflective layer 5 is made of pure silver or a silver alloy, the formation of the AgS compound is suppressed. Therefore, it is preferable to use a material which does not contain S in the layer bonded to the reflective layer 5. The thickness of the φ reflective layer 5 varies depending on the heat conduction coefficient of the material forming the reflective layer 5, but is preferably 50 nm to 300 nm. If the thickness of the reflective layer 5 is 5 Onm or more, the reflective layer 5 does not change optically, and does not affect the reflectance. However, when the thickness of the reflective layer 5 is increased, the influence on the cooling rate is exerted. Become bigger. In addition, it is necessary to form a thickness of more than 30 Onm in manufacturing. Therefore, the layer thickness of the reflective layer 5 is controlled as much as possible to the most appropriate range by using a material having a high thermal conductivity. φ Here, in the state where the compound of ZnS and SiO 2 is used for the second protective layer 4 and the Ag or Ag alloy is used for the reflective layer 5, it is preferable to insert a diffusion preventing layer between the second protective layer 4 and the reflective layer 5. (not shown). This is because the reflection rate due to the AgS compound formed by the chemical reaction between S in the second protective layer 4 and Ag in the reflective layer 5 is suppressed. The material as the diffusion preventing layer is the same as the above-mentioned interface layer, and is a material which does not substantially contain a sulfur substance, and the specific material is the same as the material of the interface layer. -16- (13) 1277961 "Manufacturing Method of Optical Recording Medium" Next, a method of manufacturing the optical recording medium of the manufacturing apparatus 100 will be described. The method of laminating the first protective layer 2, the recording layer 3, the second protective layer 4, the reflective layer 5, and the like on the substrate 1 is a film forming method in a conventional vacuum. For example, vacuum evaporation (resistance heating or electron beam type), % ion implantation, sputtering (DC or AC sputtering, reactive sputtering), especially the composition and layer thickness control becomes easy. Therefore, it is best to apply the beach plating method. Further, it is preferable to use a batch method of forming a film for a plurality of substrates 1 simultaneously in a vacuum chamber or a blade type film forming apparatus for processing the substrate 1 for each sheet. The layer thickness of the first protective layer 2, the recording layer 3, the second protective layer 4, and the reflective layer 5 formed is controlled by controlling the input power and time of the sputtering power source, or by using a crystal vibration type film thickness meter. To monitor the φ accumulation state, it is easy to control the layer thickness. Further, the formation of the first protective layer 2, the recording layer 3, the second protective layer 4, the reflective layer 5, and the like may be performed in a state in which the substrate 1 is fixed or in a state of being moved or rotated. Since the surface having a good layer thickness &gt; is uniform, it is preferable to rotate the substrate 1, and it is more preferable to further group and revolve. When the substrate 1 is cooled as needed, the amount of bending of the substrate 1 can be reduced. Further, in the range in which the effect of the present invention is not significantly impaired, after the formation of the reflective layer 5 or the like, it is possible to provide a deformation prevention or the like due to the formation of each layer of -17-(14)(14)1277961. A dielectric protective layer such as ZnS or SiO 2 or a resin protective layer such as an ultraviolet curable resin is used as the third protective layer 6. Then, one substrate 1 on which each layer is formed can be prepared in the same manner, and two substrates 1 are bonded together by an adhesive or the like to form optical recording media on both sides. Then, the optical recording medium A is initialized by the initialization device 200, and becomes the optical recording medium A to be shipped. In the recording layer 3, light such as laser light or gas flash lamp is irradiated and heated to crystallize the constituent material of the recording layer 3. Since the amount of regenerative noise is small, it is preferable to initiate by laser light. In Fig. 3, a plan view of the optical recording medium A is shown. The optical recording medium A has a center hole 5 1 and a clamping region 52 of its periphery. On the periphery of the clamp area 52, on the concentric circle, an information area (import area) 53 is provided, and the peripheral area thereof is a recording area 54 for recording actual information such as image information or sound information. Here, the lead-in area 533 may be any one of a ROM state or a RAM state. In addition to this, there is also a method of storing recording information dedicated to reproduction by forming a high-frequency wobble or hole in a laser guiding groove for obtaining a tracking signal. <<Recording Method of Optical Recording Medium>> In Fig. 4, the recording pulse pattern used when recording information on the optical recording medium A is displayed. The laser light is modulated by the laser intensity of three 値 (recording power Pw, cancellation power Pe, base power Pb) according to the recording pulse pattern, and the number of pulses is increased or decreased corresponding to the mark length of the recording signal. (15) 1277961 The recording mark of the mark length is formed on the recording layer 3. The laser intensity is such that the recording power Pw becomes maximum, and becomes smaller in the order of the cancel power pe and the base power Pb. The recording pulse pattern is as shown in FIG. 4, and the head pulse Tt()p is caused by the erasing power P e and is initially applied to the recording layer 3 at the recording power Pw before the head light Tt()p, which is connected to the head pulse Tt()p. The multiple pulses Tmp of the recording power Pw and the substrate power Pb are alternately applied by pulse, and the canceling pulse Tu at the terminal of the applied cancellation power pe is started by rising the laser light from the base power Pb. The leading pulse Tt()p and the multi-pulse Tmp are used as recording pulses for forming recording marks for the recording layer 3. Further, there is also a state in which the recording pulse is formed by the front pulse Tt()p instead of the multiple pulse Tmp. For example, in DVD-RW, the mark length is 10 types of 3T, 4T, 5T, 6T, 7T, 8T, 9T, 10T, 1 IT, and 14T. In the state where the mark length is nT, the number of the multiple pulses Tmp is generally (n - 1) or (η - 2). In the state of Fig. 4, the state of (η - 2) is shown. Here, the unit time of the Τ system is in DVD-RW, at 1x speed of DVD (recording line speed: 3.5m/s), it becomes lT=38.2ns, and at 4x speed of DVD (recording line speed: 14 · 0m / s ), which becomes 1T and 9.6 ns. In addition, with the recent high-speed recording, the unit clock Τ becomes shorter and becomes several ns. Therefore, the response of the rise and fall of the laser pulse can be considered. The recording pulse pattern based on 2T as shown in Fig. 5 is used as a limit. In Fig. 5, there is shown a recording mark for forming a recording pulse A having a mark length of -19-(16) 1277961 3T, a recording pulse B having a mark length of Π T, and a recording pulse C having a mark length of 14 Τ. Recording pulse pattern ° "Optical recording device" In Fig. 6, an optical recording device according to an embodiment of the present invention for irradiating laser light having a desired recording pulse pattern on an optical recording medium is shown. First, the spindle motor 3 1 rotates the optical recording medium A. The rotation control unit 32 is controlled so that the number of rotations of the spindle motor 3 1 becomes the recording linear velocity corresponding to the recording speed of the object. Further, there is a semiconductor lens (LD) 3 3 which is used for recording, reproduction, or erasing of the optical recording medium A, or a lens (not shown) for collecting light by laser light of the LD 33, and a 4-segment light receiving unit. The optical head 34 of the element (not shown) is movably disposed in the radial direction of the optical recording medium A. Further, it is preferable that the recording light source used in the optical recording apparatus of the present embodiment is a high-intensity light source such as laser light or stroboscopic light. Even in this case, it is preferable that the light source can be miniaturized, power consumption is small, and it is easy to perform modulation. Therefore, semiconductor laser light is preferable. The four-divided light-receiving element 341 of the optical head 34 is attached to the optical recording medium A, and receives the reflected light of the laser light irradiated by the LD 33. The four-divided light-receiving element 341 generates a push-pull signal based on the received light, and outputs it to the wobble detecting unit 36. Further, the four-divided light-receiving element 314 outputs a focus error signal and a tracking error signal to the drive controller 44 based on the received light. Further, the reproduced signal of the composite signal of the four-divided light receiving element 34 1 is outputted to -20-(17)(17)1277961 to the reflectance detecting unit 46. The drive controller 44 controls the actuator control unit 35 based on the supplied focus error signal and the tracking error signal. The actuator control unit 5 controls the focusing and tracking of the optical recording medium A by the optical head 34. The reflectance detecting unit 46 detects the reflectance based on the supplied reproduced signal, and outputs the detection result to the system controller 45. The wobble detecting unit 36 includes a programmable band pass filter (BPF) 361, and outputs the detected wobble signal to the address demodulating circuit 37. The address demodulation circuit 37 is outputted by demodulating the address by the detected wobble signal. The recording clock generation unit 38 that inputs the demodulated address has a PLL synthesizer circuit 381, generates a recording channel clock, and outputs it to the recording pulse generating unit 39 and the pulse number control unit 40. The recording clock generation unit 38 is controlled by the drive controller 44. The drive controller 44 also controls the rotation control unit 3, the actuator control unit 35, the swing detection unit 36, the address demodulation circuit 37, and the system controller 45. The drive controller 44 is controlled by the swing detection unit. The supplied swing signal is output to the recording clock generation unit 38. Further, the address information supplied from the address demodulation circuit 37 is output to the system controller 45. The system controller 45 has a memory 45, and controls the EFM + encoder 42, the mark length counter 41, the pulse number control unit 40, and the LD drive unit 43. The EFM + encoder 42 performs 8 - 16 modulation on the input recording information, and becomes modulated data, and outputs it to the recording pulse generating unit 3 9 and the mark length counter 4 1 . The mark length counter 4 1 is activated as the root - 21 - (18) 1277961. The mark length generating unit that counts the predetermined mark length based on the modulated data, and outputs the count 値 to the recording pulse generating unit 39 and the pulse number control unit 40. . The pulse number control unit 40 controls the recording pulse generating unit 39 to cause the recording pulse to be a predetermined pulse based on the supplied count 値 and the recording channel clock. The recording pulse generating unit 39 includes a front pulse control signal generating unit 39t, a multiple pulse control signal generating unit 39m, and a cancel pulse control signal φ generating unit 39c. The front pulse control signal generating unit 39t generates a front pulse control signal, and the multiple pulse control signal generating unit 39m generates a multi-comp. pulse control signal, and the cancel pulse control signal generating unit 39c generates a cancel pulse control signal. Each of the control signals is supplied to the LD driver unit 43, and the switch unit 433 is driven by the drive current source 4 3 1 w according to the supply recording power Pw, the drive current source 4 3 1 e of the cancellation power P e , and the base power P b . The control signal of the current source 43 1 b is driven to switch to generate a recording pulse pattern. • Pw drive current source 43 1 w, Pe drive current source 43 le and Pb drive current source 43 1 b are supplied according to recording power Pw, cancellation power Pe and base power Pb of memory 45 1 stored in system controller 45. Current is supplied to the optical head 34. These three lines are used to make the recording characteristics of the optical recording medium A the most appropriate, and the most appropriate identification information can be stored in the memory 451 in advance or by updating. The storage is performed or determined and stored by the reflectance detecting unit 46. In addition, 'memory 4 5 1 is for example R Ο M ( R ead Ο η 1 y M em 〇 ry) or RAM can be recorded (Random Access Memory -22- (19) 1277961 (random access memory)). However, the optical recording apparatus of the present embodiment is configured to be capable of setting a recording linear velocity selected from a plurality of recording linear velocities in accordance with the high linear velocity (high speed) of the optical recording medium. The system controller 45 controls the Pw drive current source according to the identification information of the recording line speed indicated by the memory 45 1 when the input signal for selecting the recording line speed (double speed mode) is input. 43 1 w, Pe drive current source 4 3 1 e and P b drive current source 4 3 1 b. In the memory 4 5 1, as described above, the identification information of a plurality of recording line speeds is stored. The generated recording pulse pattern is input to the optical head 34. The optical head 34 controls the LD 3 3 to output the desired recording pulse pattern and the LD luminescence waveform of the power ratio ε (Pw/P), and records the recorded information on the optical recording medium A. The recording pulse generating unit 39, the LD driver unit 43, and the optical head 34 are generated based on the mark length generated by the mark length counter 41, and are generated to be raised from the cancel power P e and greater than the cancel power Pe. The recording pulse between the recording power Pw and the substrate power Pb which is smaller than the cancellation power Pe and the erasing pulse which is raised from the substrate power Pb to the cancellation power Pe, for the recording layer 3, is started by the LD3 3 In the recording pulse pattern, the recording light is irradiated, and the recording unit 400 that records the recording mark of the recording information is operated. <<Initialization of Initialization Power>> The inventors presume that in the initiation device 200, the initiation laser is used for initializing the optical recording -23-(20) (20)1277961 medium. Whether the power (initialization power) affects the recording and rewriting characteristics of the optical recording medium A; it is found from the following Examples 1 to 3 and Comparative Example 1 and Comparative Example 2 that the inference is correct , with the initialization power that the recording and rewriting characteristics become optimal. In the present embodiment, the initial state of the optical recording medium A is reviewed by the amplitude of the difference signal (tracking detection signal) in the off-track state. Further, the off-track state refers to a state in which the laser light for reproduction is irradiated onto the optical recording medium A so that the spot light caused by the laser light does not follow the track (a state in which no tracking is applied). As shown in Fig. 7, the four-divided light-receiving element 341 is composed of light-receiving elements 341a to 341d. The first light receiving element group composed of the light receiving elements 341a and 341b and the second light receiving element group including the 341c and 341d are arranged to face each other in the track (that is, in the radial direction). The spot light that has been irradiated onto the optical recording medium A is reflected on the optical recording medium A, and is received by the light receiving elements 341a to 341d. In the state where the light receiving signals (current 値) output by the light receiving elements 341a, 3 4 1 b, 3 4 1 c, and 3 4 1 d are respectively la, lb, Ic, and Id, the difference signal amplitude can be It is defined by the following formula (1). In equation (1), the AC system displays the right side of the formula to become an exchange. Amplitude of the difference signal = 丨 (Ia + Ib) - (Ic + Id) | AC · (1) When the information is reproduced simultaneously on the rotating optical recording medium A, the LD3 3 is spirally (or linearly) The track (groove) formed on the substrate 1 of the optical recording medium A is irradiated with laser light having a reproducing power Pr, and the spot light of the laser light is collected and tracked at -24-(21) 1277961 orbit. This state is referred to as an aligned orbital state. Then, when the spot light is tracked at the center of the groove or the end face in the aligned track state, the amount of return light (I a + lb ) and (Ic + Id ) returned to the four-divided light receiving element 341 are equal. The difference between the difference signal (tracking detection signal) becomes 〇 and the amplitude cannot be obtained. In other words, the output of the four-divided light-receiving element is constant. * However, when the optical recording medium A is rotated while the information is being reproduced, the point light from the LD 33 cannot be traced to the track, and the optical head 34 is fixed in a fixed position (off-track state). The difference in the amount of light recovered by the optical element is different, and the amplitude output of the difference signal (tracking detection signal) shows the periodic variation of Fig. 8. Figure 8 shows the difference signal in the off-track state by the oscilloscope. This variation is based on the optical recording medium A, and the groove is spirally scribed. Therefore, the position of the groove with respect to the spot light is periodically changed by the rotation of the optical recording medium A. φ Fig. 9 shows the difference in signal amplitude between the off-orbit state and the laser power (initialized power) of the direct current laser irradiated on the optical recording medium at the time of initiation. When the initializing power of the illumination is sequentially increased for a predetermined optical recording medium, the difference signal amplitude becomes a characteristic of the curve of the drawing. In this curve, there is a saturation point S 1 which does not increase the amplitude of the difference signal even if the initializing power is increased. The characteristic shown in Fig. 9 is due to the change in the crystal structure of the material constituting the recording layer 3 by the intensity (size) of the initializing power. Further, the crystal structure of the recording layer 3 is also different because the difference signal amplitude becomes the saturation point S1. -25- (22) (22)1277961 Further, in the case where the difference signal amplitude does not reach the initializing power P0 to the saturation point S1, the difference signal amplitude of the optical recording medium A in the initialized state becomes SO, in which state In the state where the recording layer 3 illuminates a direct current laser having a power greater than P0, the difference signal amplitude increases with the curve of FIG. This is considered to be because the degree of crystallization of the recording layer 3 is increased by re-illuminating the direct current laser. As a result of the experiment and study by the inventors, it was found that the initializing power P0 of the difference signal amplitude does not reach the saturation point S1, and the optical recording medium A is initialized by the most appropriate In the state of recording, the jitter of the DOWO·· Direct Over Write is good after one (first) recording, and even after one rewriting (DO W1 ) Dithering and repeated re-shaping jitter also yield good characteristics. On the other hand, it has been found that the DO W0 jitter becomes good in the state where the difference signal amplitude reaches the initializing power P 1 of the saturation point S 1 and is started for the optical recording medium A, but the DO is good. The jitter of W1 becomes very poor, and good rewrite characteristics cannot be obtained. The so-called rewriting of the single-beam rewriting described herein means that the previously formed recording marks are eliminated by one-time laser scanning to form a new recording mark. Next, DO W0 means that the first recording of the recording mark is formed for the unrecorded portion of the optical recording medium A which is initialized, and D0W1 is the first rewriting in which the recording mark is formed. In addition, it is good to define the jitter that is less than 1% of the adverse effect of the error rate, and it will be covered by DOWO to DOW 1 000 (from the first recording to the rewriting 1000 times) and -26- (23) (23) 1279761 Stable to obtain jitter below 10%, defined as good DOW jitter characteristics. However, even in the state where the initializing power applied when the optical recording medium A is initialized is unknown, as described below, it can be discriminated whether or not the optical recording medium A is saturated with the difference signal amplitude. The initializing power of the starting power P 1 or more at the point S 1 is initialized or initialized with the initializing power P0 which is not satisfied with the saturation point S 1 . First, with respect to the initiated optical recording medium A, the difference signal amplitude of the off-track state is measured. Then, in the optical recording medium A, an initialized power DC laser such that the measured difference signal amplitude exceeds the originally obtained initial power can be applied, and the difference signal amplitude of the off-track state can be measured to compare the difference between the two. Signal amplitude. The present embodiment is characterized in that the difference signal amplitude of the off-track state after the initiation is smaller than the saturation 値S 1 . An example of a suitable implementation means that the initial power of the laser light at the time of initiation is reduced to such an extent that it does not reach the initial power P 1 which is the saturation 値S 1 . In each of the following examples and comparative examples, recording was performed using a disc drive tester (DDU 1 000) manufactured by Pulse Technology Co., Ltd., which is equipped with a laser diode of 658 nm and an optical lens of ΝΑ=0.60. 1 beam • rewrite) and regeneration. The recording linear velocity is 14 m/s (equivalent to 4 times the DVD-RW specification), and the recording signal is evaluated by using a 8 - 16 (EFM + ) modulation random pattern for recording and reproduction. Unit clock T system 9.6ns (4 times the DVD)

-27- (24) l277961 speed), bit length system 〇 · 267 / m / bit. In this manner, recording of the same density as that of the DVD-ROM is performed for the optical recording medium A. The capacity of the optical recording medium A in this state is 4.7 Gbytes. Further, after rewriting the adjacent track for the most appropriate condition for the optical recording medium A, the center of the amplitude of the reproduced signal is subjected to the cutoff to measure the jitter of the clock pair data. Further, the laser power (regeneration power) Pr of the regenerated light is fixed at 〇.7 mW. In addition, the recording strategy uses a split pulse train as defined by D V D - RW version 1 · 1 shown in Fig. 4. (Example 1) Each of the layers described later was formed on a substrate 1 made of a polycarbonate resin having a diameter of 120 mm and a thickness of 66 mm. On the substrate 1, voids are formed at a track pitch of 7. 7 4 /z m. The groove depth is 25 nm, and the ratio of the groove width to the end face width is about 40:60. Further, the groove is formed in a convex shape by the recording/φ reproduction or the elimination of the incident direction of the laser light. First, in the exhaust vacuum vessel to 3x10_4Pa, in a 2 x 10_1 Pa Ar (argon) gas atmosphere, by using a high frequency magnetron sputtering method of adding 20 mol% of SiO 2 ZnS target, on the substrate On the first, a first protective layer 2 having a layer thickness of 70 nm is formed. Then, a recording layer 3 having a thickness of 16 nm is laminated by a 4-element single alloy target of Ge—In—Sb—Te, and then the layer thickness is laminated by the same material as the first protective layer 2. The second protective layer 4 of 16 nm is laminated with a reverse layer -28-(25) 1277961 shot layer 5 having a layer thickness of I20 nm by an Ag-Pd-Cu target. After the substrate 1 was taken out from the inside of the vacuum container, propylene-based ultraviolet curable resin (SK5 110 manufactured by Shin-Chem Chemical Co., Ltd.) was spin-coated on the reflective layer 5, and cured by ultraviolet irradiation to form a film thickness of 3/zm. The third protective layer 6. In this way, an optical recording medium that is not initialized is created. For the recording layer 3 of the optical recording medium which is not initialized, the POP 120 made of Hitachi Computer Equipment is used as the initialization device 200, and the laser beam width 250 μηα in the radiation direction and the laser light width Ι.Ομιη in the scanning direction are used. The initializing condition is performed at a scanning linear velocity of 7.0 m / s and a transmission pitch of 200 μm to obtain an optical recording medium 第 shown in Fig. 2. Here, the saturation point S 1 of the difference signal amplitude of the optical recording medium A is detected in advance by the initialization device 200. The difference signal amplitude of the optical recording medium A reaches the saturation point S1 when the laser power of 2400 mW is irradiated, and the 値 is 5.2 V. In the first embodiment, an optical recording medium A for starting an unactivating optical recording medium with a laser power of 200 OmW is prepared, and when the difference signal amplitude S0 of the off-track state is measured, it becomes 5.04V. Therefore, the amplitude ratio of the embodiment 1 is S 0 / S 1 〇 . 9 7 . Each 値 is shown in Table 1. Further, each of S0 and S1 shown here is changed by an optical recording medium or a measuring device, and is not limited to the present invention except for the amplitude ratio S 0 / S 1 . This system is also identical to other embodiments and comparative examples. Next, on the optical recording medium A, recording is performed on the groove of the recording layer 3 from the side of the substrate 1. -29- (26) 1277961 The recording pulse pattern which becomes the most suitable recording condition for the optical recording medium A is the line speed of 14 m / s (4 times the speed of the DVD), and becomes TtQp = 〇·6 [Τ], Tmp = 0·5. [Τ], 0·0[Τ]. Further, the laser intensity of the laser light is three turns of the recording power Pw = 1 7.0 [mW], the cancellation power Pe = 5 [mW], and the base power Pb = 0.5 [mW]. The most appropriate recording conditions were also the same as in the following Example 2, Example 3, Comparative Example 1, and Comparative Example 2.

The initial and rewrite recording characteristics are as shown in Table 1. The initial recording (DOWO) jitter is 6.5%, the rewriting is once (D0W1), the jitter is 9.1%, and the rewriting is 9 times (D0W9) is 7.9%. In addition, When the jitter of overwriting 1000 times (DOWIOOO) becomes 8.8%, the rewriting characteristics are very stable and the recording characteristics become good. [Table 1] Laser power flutter [%] S0/S1 S[V] S1[V] [mW] DOWO DOW1 DOW2 DOW9 DOW100 DOW 1000 Example 1 2000 6.5 9.1 8.3 7.9 8.2 8.8 0.97 5.04 5.20 Example 2 1800 6.4 8.6 8.4 7.8 7.9 8.0 0.78 4.06 5.20 Example 3 1600 6.7 8.9 8.4 7.8 8.3 8.6 0.63 3.28 5.20 Comparative Example 1 2400 7.2 14.3 13.0 10.8 10.5 11.0 1.00 5.20 5.20 Comparative Example 2 1400 (Example 2) Prepared as Example 2 The laser power of the optical recording medium A for the initiation of the uninitiated optical recording medium with a laser power of 1 800 m W is measured by the difference -30-(27) (27) 1278961 At the time, it became 4·06ν. Therefore, the actual example also has an amplitude ratio S 0 / S 1 of 0 · 7 8 . Other conditions are the same as in Example 1. The initial and rewrite recording characteristics are as shown in Table 1. The D Ο W 0 jitter is 6.4%, the DOW1 jitter is 8.6%, and the D0W9 jitter is 7.8%. In addition, the jitter at D Ο W 1 0 0 becomes 8 · At 0%, the rewrite characteristics are very stable and the recording characteristics become good. (Embodiment 3) As an embodiment 3, an optical recording medium A for initializing an uninitiated optical recording medium with a laser power of 1 600 mW is prepared, and when the difference signal amplitude SO of the off-track state is measured, 3.28V. Therefore, the amplitude ratio of the third embodiment is 0.63 in the SO/S1 system. Other conditions are the same as in Example 1. The initial and rewrite recording characteristics are as shown in Table 1. The DO W0 jitter is 6.7%, the DOW1 jitter is 8.9%, and the DOW9 jitter is 7.8%. In addition, the rewrite characteristics are very stable when the DO W1 000 jitter is 8.6%. The recording characteristics become good. (Comparative Example 1) As Comparative Example 1, an optical recording medium A which was prepared by initializing an illuminating recording medium with a laser power of 240 OmW was prepared in the same manner as in Example 1. When the difference signal amplitude S0 of the off-track state is measured, it becomes 5.2V. Therefore, S0 and S1 of Comparative Example 1 are equal, and -31 - (28) 1277961 has an amplitude ratio S Ο / S 1 system 1. 〇. The initial and rewrite recording characteristics are as shown in Table 1. The DO W〇 jitter is 7.2%, the DOW1 jitter is 14.3%, and the DOW9 jitter is 1〇, 8%. In addition, the jitter at D Ο W 1 0 丨丨 becomes 丨丨When 〇%, d 〇w 1 jitter is particularly poor, and good D Ο W jitter characteristics cannot be obtained. It is known that, as in this case, when the amplitude ratio S 0 / S 1 becomes 1 · 〇, that is, the difference signal amplitude of the off-track state reaches the initial φ power of the saturation 値 S 1 , the DO W1 jitter deteriorates. Unable to get good duplicate records. Features. On the other hand, if SO/S 1 is smaller than 1, and initialization is performed without starting power to saturation 値S 1, good DOW jitter characteristics are obtained. (Comparative Example 2) An optical recording medium was produced in the same manner as in Example 1 except that the initializing power was changed to 1400 mW. However, in Comparative Example 2, in the state where the recording layer 3 is still amorphous, in the initiation process 200, the crystallization state cannot be obtained, and the initiation cannot be performed. It is known from the comparative example 2 and the third embodiment that if the output of the initializing power is lowered so that the difference signal amplitude of the off-track state becomes saturated, and below S 1 , a good DOW jitter characteristic is obtained, which is initialized. The power _ rate becomes too small to be initialized. The amplitude of the limit is greater than the S0 / S1 system, 0.6. Below this, it is not easy to initialize the optical recording medium. From the above-described Example 1 to Example 3, Comparative Example 1, and Comparative Example 2 - 32 - (29) 1277961, it was found that when the amplitude ratio SO / S1 is more than 0.6 and less than 1 · ,, good DOW jitter characteristics are obtained. It also prevents the deterioration of DO W1 jitter. When the amplitude ratio S 0 /S 1 is 0.6 or less, it is not easy to start the optical recording medium. On the other hand, when it is 1.0, the DOW1 jitter is deteriorated, and good repeat recording characteristics cannot be obtained. When it is considered that the reflectance determined by the DVD-RW specification is 18% or more, it is more preferable that the amplitude ratio S 0 / S 1 is larger than 〇 · 8 and less than 1.0. φ Further, the feature of the present invention is particularly effective for the optical recording medium A corresponding to recording at a high linear velocity (above 4 times the speed of the DVD). The above results are shown in Figure 1 on the basis of Table 1. It is also known from the figure that the start of the optical recording medium is performed by the initializing power which does not reach the saturation 値S 1 , so that the jitter of the DO W 1 is good. "Review of the most appropriate power cancellation" φ Next, the inventors have inferred whether or not the elimination power P e has an influence on the recording and rewriting characteristics of the optical recording medium, according to the following Examples 4 to 8 and Comparative Examples 3 to 7. And found that its inference has become correct, with the most appropriate power cancellation for recording and rewriting characteristics. (Embodiment 4) As Example 4, a pre-recorded medium 对于 for the uninitiated optical recording medium was prepared at a scanning linear velocity of 4.5 m/s, a laser power of 160 OmW, and a transmission pitch of 220 μm. Other conditions are the same as in the examples -33-(30) 1277961 1. Further, the optical recording medium A which is initialized by the initiation condition is as shown in Fig. 11, and the reflectance variation in one track is small, and the reflectance is slightly constant. Then, in the recording area 54 of the optical recording medium A, an unrecorded portion in which no information is recorded once, and an unrecorded portion when the reproducing light having the reproducing power Pr (0.7 m W ) is started to be irradiated by the LD 3 3 is obtained. The reflectance R0. In the unrecorded portion, the erasing power Pe is changed, and the laser light having the φ erasing power Pe is irradiated, and the reflectance R of the unrecorded portion of each of the erasing powers P e is measured by the LD 33 starting to irradiate the laser for reproduction. At the time of Fig. 12, the reflectance curve C 1 shown by the solid line is drawn. The reflectance curve C1 is such that the elimination power Pe is approximated to a straight line which is inclined almost from the start point of OmW to the bending point Q1. The cancellation power at the bending point Q 1 is made P 1 . Further, the reflectance from the start point (power 0) to the bending point Q 1 is equal to the reflectance R0 of the unrecorded portion. When the reflectance curve C1 passes through the bending point Q1 such that the φ elimination power is greater than P1, the reflectance sequentially increases as the cancellation power increases, reaching the peak point Q2. The elimination power of the peak point Q2 is P2, so that the reflectance at this time becomes the maximum reflectance R1. When the peak point Q2 is reached, even if the cancellation power is greater than the cancellation power P2, the reflectance is reduced. The reflectance R0 of the unrecorded portion of the optical recording medium A of Example 4 was 19.5, the erasing power P1 of the bending point Q1 was 6.5 mW, and the maximum reflectance R 1 was 21.1. Therefore, the reflectance ratio ((R 1 - R 0 ) / R 0 ) is 0.08. -31- (31) (31) 1279961 Next, on the optical recording medium A, recording is performed on the groove of the recording layer 3 from the side of the substrate 1. The recording pulse pattern which becomes the most suitable recording condition for the optical recording medium A of the fourth embodiment is the line speed ί 4m/s (4 times speed of the DVD)' becomes Tt (3p=0.6[T], Tmp two 0.5[T], Tel=〇.〇[T]. In addition, the laser intensity of laser light is 3 using recording power Pw=l7.〇[mW], elimination power Pe=4.6[mW], base power Pb=0.5[mW]消除 Elimination power ratio (Pe / P1) system 〇 · 7. After the measurement, finishing and display in Table 2 ° initial characteristics and rewrite record characteristics as shown in Table 2, the initial record (DOWO) jitter is 6.5% , Rewrite once (DOW1) jitter is 8.4% 'Rewrite 9 times (DO W9) jitter is 8.1%. In addition, when the jitter of about 1000 rewrites (DOW1000) becomes 8.8%, even if it is rewritten, It also makes the characteristics stable and the recording characteristics become good.

-35- (32) 1277961 [Table 2] Laser power [mW] Power ratio reflectance [%] Reflectance ratio jitter [%] Pw Pe PI Pe/Pl R0 R1 (R1-R0)/R0 DOWO DOW1 DOW9 DOW 1000 Example 4 17.0 4.6 6.5 0.7 19.5 21.1 0.08 6.5 8.4 8.1 8.8 Example 5 17.5 6.0 7.5 0.8 21.0 21.7 0.03 6.8 8.8 7.8 8.0 Example 6 16.0 4.2 6.0 0.7 16.0 18.4 0.15 7.4 8.7 8.2 8.9 Example 7 17.0 3.0 6.5 0.5 20.0 21.6 0.08 7.2 9.2 8.8 8.8 Example 8 17.0 6.5 6.5 1.0 20.0 21.6 0.08 6.4 8.3 8.5 9.4 Comparative Example 3 17.0 4.6 21.6 22.0 0.02 7.2 16.6 8.1 9.6 Comparative Example 4 15.0 4.2 19.1 19.4 0.02 7.5 13.2 10.5 11.0 Comparative Example 5 17.0 4.6 5.0 0.9 17.5 21.0 0.20 9.8 12.8 9.2 9.8 Comparative Example 6 17.0 2.5 6.5 0.4 19.5 21.1 0.08 10.0 20.0 18.0 18.0 Comparative Example 7 17.0 7.5 6.5 1.2 19.5 21.1 0.08 7.4 8.9 9.2 12.0

(Example 5) # An optical recording medium A in which the layer thickness of the second protective layer 4 of Example 4 was changed to 12 nm was used. R0 is 21.0, which is eliminated at the bending point qi. Power P1 is 7.5 mW, R1 is 21.7, and reflectance is 0. 〇3. In the recording conditions of the fourth embodiment, the recording power Pw was changed to 17.5 mW, and the erasing power pe was changed to 6.0 mW to perform recording and evaluation. The elimination power ratio is 0.8. The initial characteristics and rewrite characteristics are shown in Table 2. The D〇w〇 jitter is 6.8%, the DOW1 jitter is 8.8%, and the DOW9 jitter is 78%. Further, when the jitter of the DOW 1 000 becomes 8·0%, even if the weight -36-(33) I277961 write ' is performed, the characteristics are always stabilized, so that the recording characteristics become good. (Example 6) An optical recording medium A in which the layer thickness of the recording layer 3 of Example 4 was changed to 12 nm was used. R0 is 1 6.0, and the power P 1 at the bending point Q 1 is 6.0 mW, R1 is 1 8.4, and the reflectance ratio is 0·15. In the recording conditions of the fourth embodiment, the recording power Pw was changed to • l6.0 mW, and the erasing power pe was changed to 4.2 mW to perform recording and evaluation. The elimination power ratio is 0.7. As shown in Table 2, the initial characteristics and the rewrite recording characteristics were the same as in Example 4, and good characteristics were obtained. (Example 7) Using the optical recording medium A of the same manner as in Example 4, in the recording conditions of Example 4, the erasing power Pe was changed to 3. OmW, and recording was performed. The cancellation power P 1 at the bending point Q 1 is the same as that of the embodiment 4 and becomes 6.5 mW, and the elimination power ratio is 0.5. As shown in Table 2, the D0W1 jitter was 9.2% and was slightly larger, but similarly to Example 4, good characteristics were obtained. (Embodiment 8) Using the optical recording medium A of the fourth embodiment, in the recording conditions of the fourth embodiment, the erasing power pe was changed to 6.5 mW to perform recording and evaluation. The cancellation power P 1 at the bending point Q 1 is the same as in the embodiment 4 and -37 - (34) (34) 1279961 becomes 6.5 mW, and the power ratio is eliminated. As shown in Table 2, the DOW1 000 jitter system was 9.4% and was slightly larger, but similarly to Example 4, good characteristics were obtained. (Comparative Example 3) An optical recording medium A having a large Sb / Te ratio of a 4-element single alloy target of Ge-in-Sb-Te used in the recording layer 3 of Example 4 was used. When the reflectance curve of the optical recording medium A of Comparative Example 3 is produced, there is no bending point Q 1 and peak point Q2, and in the second drawing, the reflectance curve C2 having a small change in reflectance indicated by a broken line is drawn. . Therefore, the cancel power P1 at the bending point Q1 cannot be obtained, but the reflectance R0 of the unrecorded portion becomes 21.6, and the maximum 値 of the reflectance curve C2 becomes the maximum reflectance R1 = 22.0, which is calculated in the same manner as described above. The reflectance ratio is 〇.〇2. Recording and evaluation were carried out by the same recording conditions as in Example 4. The initial characteristics and the rewrite recording characteristics are as shown in Table 2. The D Ο W 0 and DOW9 jitter systems are good, but the DOW1 jitter is deteriorated, and good D OW jitter characteristics cannot be obtained. (Comparative Example 4) An optical recording medium A having a small S b /T e ratio of a 4-element single alloy target of Ge-In-Sb-Te used in the recording layer 3 of Example 4 was used. The reflectance curve is the same as that of Comparative Example 3, and C2 is not obtained, and the power P 1 at the bending point Q 1 cannot be obtained, but the reflectance of the unrecorded portion is -38 - (35) 1277961 R0 becomes 19·1, and the reflection is made. The maximum 値 of the rate curve C2 becomes the maximum reflectance R1 = 19.4, and the reflectance ratio calculated in the same manner as described above is 0.02. In the recording conditions of the fourth embodiment, the recording power Pw was changed to 1.5 〇 mW, and the erasing power Pe was 4.2 mW to perform recording and evaluation. The initial characteristics and the rewrite recording characteristics are as shown in Table 2. The DO W0 jitter system is good, but the DO Wl, DO W9, and DOW 1 000 jitter systems are deteriorated, and good D Ο W jitter characteristics cannot be obtained.

I (Comparative Example 5) An optical recording medium A which was initialized with the optical power of the same configuration as that of Example 4 at a laser power of 220 OmW was used. The optical recording medium A which is initialized under the priming condition is as shown in Fig. 3, so that the fluctuation of the reflectance in one track becomes large. R 〇 17.5, the power at the bending point Q1 is eliminated. P1 is 5.0mW, R1 is 2 1.0, and the reflectance is 〇. &gt; When recording and evaluation were performed under the same recording conditions as in Example 4, as shown in Table 2, the DOWO, DOW1, and DOW1000 jitters were deteriorated, and good DOW jitter characteristics could not be obtained. In addition, the elimination power ratio is 0.9. (Comparative Example 6) Using the optical recording medium A of the fourth embodiment, in the recording conditions of the fourth embodiment, the recording power was changed to 2.5 mW, and recording and evaluation were performed. The cancellation power P 1 at the bending point Q 1 is the same as in the embodiment 4 and -39-(36) 1277961 becomes 6.5 mW, and the elimination power ratio is 0.4. As shown in Table 2, jitter is caused by DOW0 jitter! Above, good DOW jitter characteristics cannot be obtained. (Comparative Example 7) Using the optical recording medium A of the same manner as in Example 4, in the actual recording conditions, the erasing power Pe was changed to 7.5 mW for evaluation. The cancellation power P 1 at the bending point Q 1 is the same as 6.5 mW, and the power ratio is 1.2. As shown in Table 2, DO W9 is good by DO W0 jitter, but the DOW 1 000 jitter shows that the 10% method gives good DOW jitter characteristics. From the above, it was found that the optical recording medium obtained good dynamic characteristics when the reflectance ratio ((R1 - R0) was sufficient (2). 0.03 ^ (Rl - R0) / R0 ^ 0.15 (2) Fig. 14 shows the DOW jitter characteristics of the embodiment 4 to the embodiment 6 and the ratio _ compared with the example 5. The dynamic system becomes 10% in a state where the reflectance ratio is smaller than the increase in the elimination power without increasing the reflectance. In the above, the recording characteristics are deteriorated. On the other hand, in the state where the ratio is larger than 〇·15, the start-up can not be obtained by DOW0 under the condition that the portion mixed in one track and the portion having a small reflectance are small. The recording and rewriting characteristics are shown in Fig. 15, and the jitters of the recording example 4 are shown in the fourth embodiment to the sixth embodiment and the ratio of 10% to the fourth embodiment, and no/R0) is full: DOW is shaken. ίExample 3~ is more than 0.03, and D Ο W 1 is shaken at a reflectance reflectance. Therefore, ί3~40-37(37) (37)1277961 is compared with the RF signal of Example 5 relative to the cancellation power Pe. . Further, it has been found that it is preferable from Table 2 that the elimination power ratio (pe/p丨) satisfies the following formula (3). 0.5 ^ Pe / P 1 ^ 1.0 (3) The DOW jitter characteristics of Example 4, Example 7, Example 8, Comparative Example 6, and Comparative Example 7 are shown in Fig. 16. When the elimination power ratio is less than 〇 · 5 , the elimination power Pe becomes small, and the recording mark cannot be sufficiently eliminated. Therefore, good recording and rewriting characteristics cannot be obtained by DOW0. On the other hand, when the cancellation power ratio is greater than 1·〇, the jitter after DOW9 becomes 10% or more, and the recording characteristics are deteriorated. In addition, it was found that the initiation conditions of the optical recording medium also affect the recording and rewriting characteristics. As shown in Fig. 13, the optical recording medium A which was initialized with the initialization condition in which the reflectance variation in one track was large was not able to obtain good recording and rewriting characteristics. Therefore, it is preferable that the optical recording medium A is initialized with an optimum starting condition in which the reflectance in one track does not substantially change. Not only the phase-change optical recording medium such as the DVD-RW mentioned above, but also the structure of the ultra-high-density phase change type recording medium shown in Fig. 7 can be said to have the same effect. . The optical recording medium B shown in Fig. 17 is formed by sequentially laminating the first protective layer 12, the recording layer 13, and the second protective layer on the protective layer 17 having the incident surface 17a for recording/reproducing or eliminating the laser light as the bottom surface. The structure of the layer 14, the reflective layer 15 and the substrate stack. (38) 1277961 [Simplified description of the drawings] Fig. 1 is a diagram showing a manufacturing apparatus of the phase change type optical recording medium 300 or a manufacturing/initiation process by the manufacturing apparatus 300. Fig. 2 is an enlarged cross-sectional view showing an embodiment of an optical recording medium of the present invention. Fig. 3 is a plan view showing an embodiment of an optical recording medium of the present invention. Fig. 4 is a view showing a first example of a recording pulse pattern. Fig. 5 is a view showing a second example of the recording pulse pattern. Fig. 6 is a block diagram showing an embodiment of the optical recording apparatus of the present invention. Fig. 7 is an enlarged cross-sectional view showing an embodiment of a four-divided light-receiving element. Figure 8 is a graph showing the amplitude of the difference signal in the off-track state by an oscilloscope. Figure 9 is a graph showing the relationship between the amplitude of the difference signal and the difference between the off-track state and the initial power. Figure 10 is a plot of DOW jitter characteristics showing the relationship of jitter to DOW times. Fig. 1 is a view showing an example of the ideal change in the reflectance of the optical recording medium A. Fig. 12 is a diagram schematically showing an example of a reflectance curve. Fig. 1 is a view showing an example of the variation of the reflectance of the optical recording medium A - 42 - (39) 1277961. Fig. 14 is a view showing the DOW jitter characteristics of Examples 4 to 6 and Comparative Examples 3 to 5. Fig. 15 is a view showing the relationship between the RF signals of Example 4 to Example 6 and Comparative Example 3 to Comparative Example 5 with respect to the cancellation power pe. Fig. 16 is a view showing the D Ο W jitter characteristics of Example 4, Example 7, Example 8, Comparative Example 6, and Comparative Example 7. Fig. 17 is an enlarged cross-sectional view showing another embodiment of the optical recording medium of the present invention. $Required symbol description] A Optical recording medium B Optical recording medium Pi Bending point Q1 Elimination power Pb Base power Pe Elimination power P w Recording power TC1 Elimination pulse Tmp Recording pulse Tt〇p Recording pulse 1 Substrate la Injecting surface 2 1 Protective layer 3 Recording layer -43- (40)1277961 4 5 6 11 12 13 14

17a 3 2 2nd protective layer Reflective layer 3rd protective layer Substrate 1st protective layer Recording layer 2nd protective layer Reflective layer Protective layer Injecting surface Rotary axis motor Rotation control unit 33 34

3 5 36 3 7 38 3 9 39c 39m 39t 40 4 1 LD optical head (reading unit, recording unit) Actuator control unit wobble detection site demodulation circuit recording clock generation unit recording pulse generation unit (recording unit) Elimination pulse control signal generation unit Multiple pulse control signal generation unit Front pulse control signal generation unit Pulse number control unit EF Μ + Encoder (Encoder) -44- (41)1277961

42 Marker length counter (mark length 43 LD driver section (recording section) 44 Drive controller 45 System controller 46 Reflectance detecting section 5 1 Center hole 52 Clamping area 53 Information area (introduction area) 54 Recording area 100 Manufacturing apparatus (Manufacturing Process) 200 Initializing Device (Initialization Process) 300 Manufacturing Equipment 34 1 4 divided light receiving elements (first light receiving element group) 34 1a Light receiving element 34 1b Light receiving element 34 1c Light receiving element 341d Light receiving element 361 Programmable BPF 38 1 PLL synthesizer 400 recording unit (recording pulse generating unit 39, 43 and optical head 34) 43 1 switch unit 43 1 b P b driving current source forming unit), second light receiving LD driver unit - 45 - (42) 1277961 43 le 4 3 1 w 45 1 P e drive current source P w drive current source memory

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Claims (1)

(1) 1277961 X. Patent application studio 1. An optical recording medium characterized by: a phase change optical recording medium comprising: a substrate; and a recording layer having a track for recording information; The material of the recording layer is rotated by rotating the optical recording medium while receiving the amplitude of the tracking detection signal obtained by the reflected light when the recording layer is irradiated with the off-track state, and is smaller than the saturation crystallization state. Initiation. The optical recording medium according to the first aspect of the invention, wherein the tracking detection signal is received by receiving the reflected light from the first and second light receiving element groups disposed opposite to the track. The difference between the two signals. 3. The optical recording medium according to claim 1 or 2, wherein the amplitude 値 divided by the saturation enthalpy is greater than 0.6 and less than 1.0. 4. An optical recording medium, comprising: a substrate; and a recording layer for recording information; and the recording layer is such that the recording layer is not recorded at one time. The non-recording unit of the information applies the reflectance of the unrecorded portion obtained by irradiating the regenerated light after applying the light having the predetermined DC canceling power, and becomes the predetermined DC canceling power, and sequentially increases from the power 〇. In the case of -47- (2) 1277961, the characteristic is changed by a predetermined curve; the predetermined curve has: a linear portion in which the reflectance is slightly constant; and the first increase in the reflectance of the straight portion a curved portion; and a second curved portion having a reduced reflectance; and a reflectance R0 at a bending point which is a boundary between the straight portion and the first curved portion, and between the second curved portion and the second curved portion When the reflectance of the peak point of the boundary is R1, the following formula (1) is established: 〇·〇3 g (( R1 - R〇) / r〇) g 〇"5 ... (1). In the optical recording medium according to the fourth aspect of the invention, the material constituting the recording layer is initialized by a crystallized state in which the reflectance in one track is substantially constant. 6. An optical recording method characterized by: an optical recording method for recording recorded information on a recording layer of a phase change optical recording medium, wherein said optical recording φ recording medium causes said recording layer to be absent at a time The unrecorded portion that records the information of the recording layer and applies the reflectance of the unrecorded portion obtained by irradiating the reproduced light with light having a predetermined DC canceling power, and becomes the predetermined DC canceling power, starting from the power 0 When sequentially increasing, the characteristic is changed by a predetermined curve; the predetermined curve has: a linear portion in which the reflectance is slightly constant; and a first curved portion in which the reflectance of the straight portion is increased. And a second curve portion in which the reflectance is reduced; and -48-(3) (3)1277961, the reflectance R0 at a bending point which is a boundary between the straight portion and the first curved portion, becomes the first curve When the reflectance R1 of the peak point of the boundary between the portion and the second curved portion is set, the characteristic of the following formula (1) is established: 0.03 ^ ( (R1-R0) / R0 ) €0.15 (1) The optical recording method described above The method includes: a modulation step of generating the modulation data by modulating the foregoing record information; generating a mark length generation step of the required mark length according to the modulation data; and generating, according to the mark length, the generation from the cancellation power a recording pulse pattern formed by rising and between a recording power greater than the aforementioned cancellation power and a substrate power smaller than the cancellation power and a cancellation pulse rising from the base power to the cancellation power, for the recording layer a recording step of illuminating the recording light and recording the recording mark indicating the recording information; and the recording step is such that the cancellation power of the recording pulse pattern is Pe and the power of the bending point is When P 1 , the elimination power Pe is established using the following formula (2): 0.5 ^ Pe / P1 ^ 1.0 (2). An optical recording apparatus characterized in that an optical recording apparatus records recording information on a recording layer of a phase change optical recording medium, wherein the recording medium does not record the recording at a time The unrecorded portion of the information of the layer applies the reflectance of the unrecorded portion obtained by irradiating the reproduced light to -49-(4) 1277961 after the light having the predetermined DC canceling power, and becomes the predetermined DC canceling power. When the power 〇 is sequentially increased, the characteristic is changed by a predetermined curve; the predetermined curve has: a linear portion in which the reflectance is slightly constant; and the reflectance subsequent to the straight portion is increased. a first curved portion; and a second curved portion having a reduced reflectance; and φ is a bending point which is a boundary between the straight portion and the first curved portion. The reflectance R0 is the first curved portion and the second portion When the reflectance R1 of the peak point of the boundary between the curves is set, the following formula (1) is established: 0.03 ^ ( (Rl - R0) / R0 ) $0.15 (1) The above optical recording device The method includes: an encoder that modulates the record information to generate modulated data; generates a mark length φ generating portion of a required mark length according to the modulated data; and generates a power generated by the slave according to the mark length a recording pulse pattern formed by a recording pulse composed of a recording pulse having a recording power greater than the aforementioned cancellation power and a substrate power smaller than the cancellation power and a cancellation pulse rising from the substrate power to the cancellation power, for the recording layer, Cooperating with the recording pulse pattern, illuminating the recording light, and recording the recording portion of the recording mark indicating the recording information; and the recording portion is configured to cancel the above-mentioned recording pulse pattern by the -50-(5) 1277961 rate. When the cancellation power of the aforementioned bending point is P1, (2) the elimination power Pe: 0.5 ^ Pe/ P1 ^ 1.0 (2) is established. 8. The light as recited in claim 7 includes: a portion for storing and displaying the cancel power Pe; and the recording portion for canceling power based on the stored information. Use the following formula to record the device, and the aforementioned identification of the information storage section -51 -