TW583654B - Optical recording medium - Google Patents

Abstract

The object of the present invention is to provide an optical recording to realize multi-level recording in five stages or more with reduced error rates. An optical recording medium (10) is adapted such that information is recorded by forming recording marks on a recording layer (12) that covers grooves (16) of an optical transparent substrate (14). In the recording layer (12), contiguously defined along a feed direction S of irradiation are virtual recording cells (40) which have an arbitrary unit length in the feed direction S of irradiation along the groove 16 and an arbitrary unit width in the direction orthogonal thereto. In addition, the groove width W is set so that 0.25x(lambda/NA) < W < 0.55x(lambda/NA), where lambda is the wavelength of a laser beam to be irradiated with and NA is the numerical aperture of the objective lens for the laser beam in an irradiation optical system. The irradiation time is set in five stages or more to radiate with the laser beam, thereby making it possible to record information in multi-levels.

Description

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economy 583654 A7 B7 V. Description of the Invention (:) Technical Field The present invention is related to the information provided for recording. Various record marks are formed on the recording layer, which is the light of multi-level recording of information. Recording media. The prior optical recording media used to change the length of the playback signal (the length of the reflection signal modulation unit) is multi-level for data recording. Compared with this method, the depth of the playback signal (the modulation of the reflection signal) is changed. For multi-level exchanges, the recording methods of recording most data with each signal of the same length have many related researches. With this optical recording method, as compared with only the presence or absence of pits to record secondary data, since most data can be recorded in the depth direction, the amount of signals allocated to a certain length can be increased, so the linear recording density can be increased. At present, such a recording medium has been proposed using a hologram or a multi-layered recording layer. Here, the multi-level recording refers to recording a plurality of types of recording materials whose modulation degrees of the reflected signals are different from each other. On the other hand, with regard to these multi-level recording optical recording methods, there is a problem that the power of the laser beam increases during recording, and as the depth of the formed reflected signal deepens, the signal quality deteriorates during playback. The reason for this is currently unknown. For example, conventional methods are used to shorten the recording mark to increase the density of information recorded on the recording medium. Among them, when the laser beam power is multi-level exchanged for multi-level recording, the signal quality deteriorates significantly. In other words, if a multi-level recording is adopted, it is difficult to increase the density of the recording marks, and there is a problem of incompatibility. This paper size applies to China National Standard (CNS) A4 specification (210X297 mm) &quot; -4-(Please read the precautions on the back before filling in this page j

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 583654 A7 B7 V. Description of the Invention () In addition, in the past, the optical recording method that used laser beam power as a hierarchical exchange for multi-level recording, the idea was previously mentioned, and the length of the record mark Larger than the diameter of the focused beam (beam waist) during recording. That is, the "multi-level modulation record indicates the light reflectivity of the record itself to allow direct reading of the reflectance" to achieve multi-level recording. The diameter of the general focused beam is κλ / ΝΑ (K: constant, λ: laser wavelength, NA : Number of lens openings). The detection used in CD is generally λ = 780 nm, NA = 0.45, and the diameter of the focused beam is about 1.6 microns. At this time, if the record mark length is approximately 1.6 micrometers, the above-mentioned problem of signal degradation becomes apparent, and it is difficult to record at 5 or more levels. The above problem should be the result of the intricate entanglement of all the factors such as the power setting of the laser beam and the characteristics of the recording medium. As far as the inventors know, the reason is currently unknown. High-density multi-level recording includes its recording method. Department of truth. The present invention has been made in view of the above problems, and an object thereof is to propose a novel multi-level recording method to achieve high-density multi-level recording. The present inventors have repeatedly carefully studied the optical recording medium and found a recording method for multi-level recording. It is confirmed that with this method, high-density multi-level recording of 5 levels or more can be performed on the optical recording medium. That is, the above-mentioned object can be achieved by the following invention. (1) On a translucent substrate with a specific groove, at least the above grooves are covered to form a recording layer mainly composed of a phthalocyanine pigment, which is irradiated with a laser beam, and at least a recording mark is formed on the above recording layer, which can be used as information. Record of light &amp; Zhang scales apply Chinese national standard (〇 ~ $) person 4 specifications (210 father 297 mm) '(Please read the precautions on the back before filling this page)

583654 Α7 Β7 V. Description of the invention (^ (Please read the precautions on the back before filling out this page) recording medium, which is characterized in that the recording layer along the above-mentioned groove is used to record the direction of laser irradiation for recording and playback. A virtual recording cell formed by an arbitrary unit length in the direction of travel and an arbitrary unit width in an orthogonal direction is continuously determined, and at the same time, the wavelength of the laser beam is λ (nanometer), and the laser beam irradiates the optical system. When the number of substance openings is Ν Α, the groove width W (nano) is set to 0.25 × (λ / ΝΑ) &lt; W &lt; 0.55 × (λ / NA), and at least one of the irradiation time or irradiation power is set. Set to 5 or more levels, and irradiate with the laser beam to form more than 5 kinds of record marks with different sizes on the virtual record cell. Based on the area ratio of the record mark to the virtual record cell, adjust the light reflectance for information. (2) The optical recording medium of the above-mentioned (1), wherein the groove width W is set to 0 · 30χ (A / NA) &lt; W &lt; 0.50x (λ / ΝΑ), which is preferable 0 × 32x (λ / ΝΑ) &lt; W &lt; 0 · 45χ (also / NA) (3) The optical recording medium of the above (1) or (2) is printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, wherein the above-mentioned grooves are formed in a substantially parallel majority, and the distance P (nanometre) between the adjacent grooves is set. 65 × (λ / ΝΑ) &lt; P, more preferably 0 · 7χ (λ / ΝΑ) &lt; P &lt; 1 · 2χ (λ / ΝΑ). The present inventors have found that by virtue of the records of the virtual record cell The novel modulation method of the occupation ratio of the label can be used for multi-level recording. This result can greatly increase the recording density. However, only when the recording label is formed by the modulation of the irradiation time or the irradiation power, it is sometimes impossible to actually read the label. . This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 583654 Α7 Β7 V. Description of the invention (j One of the reasons should be that the multi-order light reflectivity of the virtual record cell cannot be set with high accuracy. Multi-level recording is easily affected by the structure of optical recording media in particular. Specifically, when the multi-level recording mark is formed in the present invention, a record mark smaller than the laser light spot can be formed, and a narrower groove width than in the past can be set. On the one hand, if If the width W is less than 0 · 25χ (λ / ΝΑ), the light reflectance error of each order in the virtual recording cell suddenly increases, and the above has been known by the inventors. One of the reasons is that it is restricted by the groove. The wide record mark cannot grow to a predetermined size and the modulation degree decreases. Furthermore, although the reason is unknown, it is known that as the groove width becomes narrower, most virtual record cells with the same reflectance hierarchy are scheduled to have actual reflectance hierarchy. The phenomenon of mutation (reduced reproducibility) occurs, and the signal quality is significantly reduced (errors and deterioration). Conversely, when the track width is constant and the groove width is more than 055 × (λ / NA), it is easy to generate crosstalk due to the recording marks of adjacent grooves (the recording marks of adjacent grooves and the recording marks that should be read and written at the same time are Read and write). This prevents the gap between grooves (hereinafter referred to as the track pitch) from being enlarged, but the increase of unnecessary track pitches actually decreases the recording density. In addition, although the reason is still unknown, it is known that when a relatively large record mark is formed in order to make the virtual record cell into a low reflectance layer, the variation of the reflectance increases. As a result, signal quality deterioration, such as errors and deterioration, occurs. That is, like the current two-line recording method, not only must the groove width be set according to the type of recording layer, etc., but for multi-level recording, a groove width suitable for the purpose must be set. If this groove width is neglected, multi-level The result of the deterioration of the signal quality held. This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) (please read the notes on the back before filling this page) «1 * 11 Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Cooperatives 583654 A7 B7 V. Invention Explanation (g (Please read the notes on the back before filling this page) This tendency also depends on the current recording line speed. You must select the groove width according to the recording line speed, and because there is a higher speed (for example, compared to c D-R and other standard line speeds of 1.2 times / m 8 times or more (to about 20 times), then the applicable groove width (margin) tends to become narrower. For design, the range of low-speed recording should also include 0 or more. It can be confirmed that it is particularly useful when recording information when the light reflectance is adjusted to 5 or more (compared to the following order). And the present invention described above It can also be added as follows. It is characterized in that a laser light guide groove is provided along the recording layer, and the virtual recording cell is set in the groove, and the unit width is approximately equal to the groove width of the optical recording medium. Presented It is an optical recording medium for specific information of a multi-level recording medium. It is characterized in that a laser light guide groove is provided along the recording layer, and the optical recording medium is partially interrupted by the groove. The so-called groove width refers to the groove width obtained from the highest point of the base surface sandwiched between the groove and the groove, and the maximum groove depth at the lowest point of the groove bottom, which is roughly equal to two equal divisions. This is to consider the case where the cross-sectional shape of the groove (or base surface) is trapezoidal. Preferred Embodiments of the Invention The following describes embodiments of the present invention in detail with reference to the drawings. Optical recording media (optical discs) related to the embodiments of the present invention ) 1 〇 This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -8-583654 A7 B7___ V. Description of the invention (g, CD-R for pigment material used in recording layer 12. CD-R The recording layer 12 includes a substrate 14 formed of, for example, a transparent base material, and a coating pigment covering the laser light guide groove 16 formed on one surface (upper surface in FIG. 1) of the substrate 14, The recording layer 1 of 2 A gold or silver reflective film 18 formed on the upper side by professional plating and the like and a protective layer 20 covering the outside of the reflective film 18 are formed. The pigment used for the recording layer 12 is mainly a phthalocyanine pigment And naphthalocyanine pigments, organic pigments of all phthalocyanine pigments of the following general formula [Chemical Formula 1] are preferred. Specific examples include the following [Chemical Formula 2], etc. (Please read the precautions on the back before filling in this Page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 11

[Chemical 1] The tables of Ql, Q2, Q3 and Q4 constitute benzene or -9- This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 583654 A7 B7 V. Description of the invention (

(Please read the notes on the back before filling this page)

583654 A7 B7 V. Description of the invention (g (Please read the notes on the back before filling this page) Ethyl) hexyloxy, 6- (perfluorohexyl) hexyloxy, etc.), · Substituted or unsubstituted aryloxy (Phenoxy, p-nitrophenoxy, p-tert-butylphenoxy, 3-fluorophenoxy, pentafluorophenoxy, 3-trifluoromethylphenoxy, etc.); substituted or unsubstituted Alkylthio (methylthio, ethylthio, tertiary butylthio, hexylthio, octylthio, trifluoromethylthio, etc.); substituted or unsubstituted arylthio (phenylthio, p-nitrate Phenylthio, p-tert-butylphenylthio, 3-fluorophenylthio, pentafluorophenylthio, 3-trifluorophenylthio, etc.). Among these substituents, an alkyl group and an alkoxy group are preferred. The alkyl group is particularly preferably a substituted alkyl group having 1 to 12 carbon atoms, which may be linear or branched. 0 The substituent at this time is preferably a halogen atom such as a fluorine atom. The alkoxy S is preferably a substituted alkoxy group having 1 to 12 carbon atoms, and the alkyl portion thereof may be linear or branched. The substituent at this time is preferably a halogen atom such as a fluorine atom. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

The central atom represented by Ml is a hydrogen atom (2Η) or a metal atom. The metal atom at this time may be a metal atom of Groups 1 to 14 (Groups 1A to 7A, Group 8, 1B to 4B) of the periodic table, and specifically, Li, Na, K, Mg, Ca, Ba, Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Tc, Fe, Co, Ni,

Ru, Rh, Pd, 0s, Ir, Pt, Cu, Ag,

Au, Zn, Cd, Hg, Al, In, Tl, Si,

Ge, Sn, Pb, etc. Among them Li, Ti, V, Cr,

Mn, Fe, Co, Ni, Cu, Zn, Al, Si, etc. are preferred, and Si is particularly preferred. This paper size applies the Chinese National Standard (CMS) A4 specification (21〇X 297 mm) -11-583654 A7 B7 V. Description of the invention (g-R1 to R4 in [Chemical 1] are usually the same, but It can also be different. (Please read the precautions on the back before filling out this page) γ 1 The ligands listed in the table are hydrogen, oxygen, halogen, hydroxyl, alkyl, alkoxy, fluorenyl, or 3] 的 基。 [化 3]

In [Chemical Formula 3], each of R5 and R6 is an alkyl group, an aryl group, an alkoxy group, or an aryloxy group, and may be the same or different. Specific examples of the atom, the aryl group, the aryl group, the aryl group, the aryl group, the alkoxy group, and the aryloxy group represented by Y1 include the groups r 1 to ^ 4. Examples of the fluorenyloxy group represented by Y 1 include ethynyloxy and propionyloxy. γ 1 is preferably a group of [Chemical Formula 3], and R 5 and R 6 are preferably substituted or unsubstituted aryl groups such as an alkyl group having 1 to 6 carbon atoms and a phenyl group. Among the compounds of [Chemical Formula 1], [Chemical Formula 2] is preferable. Rl'RS'RS'RS'Re'p'Q'r, S, t, U, V, and w printed in [Chemical 2] by the Intellectual Property Consumer Cooperative of the Ministry of Economic Affairs are synonymous with [Chemical 1], whichever is better The same. In [Chemical Formula 2], R5 or R6, or R5A and R6 are usually the same, but sometimes they may be different. A specific example of [Chemical Formula 2] is represented by R 1 to R 5, and the combination of P to w is shown as -1. This paper size applies the Chinese National Standard (CNS) A4 specification (21〇'297 mm) -12-583654 A7 B7 V. Description of the invention (&amp; table compound No. R1 (= R2-R3-R4) R5 ( = R6) P (two q = r = s) τ (two 11 = v = w) 2-1 -CF2CF3 -Ph (phenyl) 1 1 2-2 -CF2CF3 + Ph (phenyl)-0 1 2- 3 -OCH2CF3 C4H6 1 1 2-4 -CF2CHF3 -Ph (phenyl) 1 1 2-5 -OCH2CF3 -Ph (phenyl)-1 1 2-6 -OCH2CF3 C4H9 1 1 (Please read the precautions on the back first (Fill in this page) The multi-level record printed on the optical recording medium 10 by the Intellectual Property Bureau of the Intellectual Property Bureau of the Ministry of Economic Affairs is based on the optical recording medium 30 shown in Figure 2. The optical recording device 30 is a CD- R / RW burner, through the spindle servo device 3 1 with a spindle motor 3 2 to rotate and drive the optical recording medium (disc) 1 〇 at a certain line speed, and the information is recorded on the light with a laser beam from the laser 36 Recording medium (optical disc) 1 0. Laser drive 3 8 According to the information to be recorded, the laser beam irradiation time of each of the virtual recording cells in the first picture (detailed later) 4 0, for example, enter the above laser 3 Laser Pulse of 6 The symbol 4 2 in Fig. 2 is an irradiating optical system including an objective lens 4 2 A and a half mirror 4 2 Β. The objective lens 4 2 A is controlled by a focus tracking servo device 4 4 and focuses the laser beam on the optical disc 1 〇 Record 餍 1 2. The objective lens 4 2A and half mirror 4 2 B are synchronized with the rotation of the optical disc 10 by the conveying servo device 46, and the movement is controlled at a specific speed from the inner periphery to the outer periphery. This paper standard applies Chinese national standards (CNS) A4 specifications (21 × 297 mm) -13- 583654 A7 ____B7 V. Description of the invention (^ (Please read the precautions on the back before filling out this page) The above-mentioned rotary servo device 3 1. Focus tracking servo device 4 4 The conveying servo device 46 is controlled by the control device 50. The data (information) to be recorded in the recording layer 12 is input to the control device 50. As shown in Figure 3, the laser driver 3 has 8 circuit cell times. The setting section 60, the recording irradiation time setting section 62, and the distribution processing section 64.

The circuit cell time setting unit 60 continuously specifies a specific circuit cell time T (Tl, T2, T3, T4, T5, T6 ...). As a result, for example, when the moving speed (linear velocity) of the laser 36 optical recording medium 10 is v, the virtual recording cell 40 of a predetermined length Η “v X Τ” is continuously recorded on the optical recording medium 10.

The recording irradiation time setting unit 62 defines the irradiation time t A ......... t G of 5 steps or more (here, 7 steps of t A to t G) within the above-mentioned circuit cell time T. At this time, the irradiation time t A ......... t G can be recorded in the memory first, and then read and specified, or the recorded irradiation time written in the optical recording medium 10 can be read. Information. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. The distribution processing section 64 modulates the original information stored in the control device 50, and sets the bit series for multi-level recording to be allocated to each circuit cell time. This multi-level bit series, because there are 7-level (A, B, C, D, E, F'G) records indicating the existence, so for example 丨 B, E, D, C, G, G. ........ 丨 etc. Each of these numbers represents a hierarchy of record marks formed on each recording circuit cell 40. Therefore, corresponding to each level of the above-mentioned bit series, the above-mentioned irradiation time t A to t G is allocated to each circuit cell time τ 1 and T 2 as shown in FIG. 1. The optical recording medium 10 is in the groove 16 and is on the optical disc. This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) -14- 583654 A7 _____ B7 V. Description of the invention (^ 3 The circumferential direction s of 4 continuously specifies virtual record cells 40. Each virtual record cell 4 〇The unit length of the circumferential direction S is Η (two vxT), which is set to be shorter than the beam diameter (the diameter of the beam waist) D (refer to FIG. 4). A base surface 17 is formed between adjacent grooves 16. Virtual The recording circuit cell 40 has a unit width orthogonal to the direction of the unit length Η (= νxT) approximately the same as the width W of the groove 16. The wavelength of the laser beam of the laser 36 is λ, and the optical system 4 is irradiated. When the number of openings of the objective lens 2 and 2A is NA, the width W of the groove 16 is set to 0 · 25χ (λ / ΝΑ) &lt; W &lt; 0.555 (λ / ΝΑ). For example, this embodiment Middle λ = 7 8 5 (nanometer), ΝΑ / 2 · 5, so the groove width W is set to a range of 0.39 &lt; W &lt; 86 · (micron) The better is to set the groove width W to 0.30χ (λ / ΝΑ) &lt; W &lt; 0.50 (λ / ΝΑ), which is 0. 47 &lt; W &lt; 〇 · 79 ( Micron), more preferably 0.50 &lt; W &lt; 0.71 (micron). The preferred groove depth is 50 to 300 nm, and the more preferable is 50 to 200 nm. This is called The trench depth refers to the height difference (depth) in the orthogonal direction between the deepest part of the trench and the highest part of the base surface. In this embodiment, the interval (gauge) P between adjacent trenches 16 is set to 0 · 65χ (λ / ΝΑ) &lt; ρ, 〇7χ (λ / ΝΑ) &lt; P &lt; 1 · 2 χ (λ / NA) is preferred. Each virtual recording cell 40 is irradiated with a laser beam one by one, and the information to be recorded is formed as a schematic diagram. For example, the record marks 48A to 48G. The specific steps include the following steps to form the record marks 4 8A to 4 8 G. This paper size applies to Chinese National Standard (CNS) A4 specifications (2) OX297 mm) (Please read the precautions on the back first (Fill in this page again) * Subscribe to the printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs-15- 583654 A7 B7 V. Description of the invention (h Record the real information on the optical recording medium 1 and use the circuit cell Τ between the set, as the continuous recording predetermined virtual cell 40, is set to the virtual cell recording laser beam irradiation time of 40 t A to t G. As a result, as shown in the time chart of FIG. 5, the bit sequence corresponding to the original information modulation 丨 B, E, D, C, G, G ......... 丨 at each circuit cell time T 1 , T 2, T 3 ......... Allocate irradiation time {t B, t E, t D, t C, t G, t G ......... 丨. In this case, it is shown that the irradiation time t is set from the beginning of the time T of each circuit cell (ie, the front-end standard). The irradiation time (intermediate standard) can also be set at the center of the time T of each circuit cell, or the time T of each circuit cell is set. The rear end is the standard setting irradiation time (back end standard). According to the time chart, if the laser beam is irradiated within the irradiation time t, and the recording marks 4 8A to 4 8 G are actually formed, each recording circuit cell 40 can be set to a desired light reflectance. This record indicates that 4 8 A to 4 8 G is not formed at the center of the laser beam. (The laser beam is circular. The disc is rotated on the side of the 0-plane and irradiated with the laser beam. The length of time becomes oblong). The focused laser beam generally has a Gaussian distribution. In the recording layer 12, only the portion of the laser beam whose radiant energy exceeds a certain valve is recorded. Therefore, it sequentially expands from the center to the outside to form a record mark 4 8 A. To 4 8 G, which is the reason. Thereby, for example, as shown in FIG. 4, 7-level records labeled 4 8A to 4 8 G with different occupation rates of the virtual record cell 40 can be formed. At this time, each record is marked with a size of 4 8 A to 4 8 G, which is set to apply the Chinese National Standard (CNS) A4 specification (210X297 mm) at this paper size (please read the precautions on the back before filling this page)- Order

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs-16- 583654 A7 B7 V. Description of the Invention (h When the laser beam is irradiated to read the virtual record cell 40, the light reflectance of the instrument's light is divided into 7 orders. The above light reflectance is The smaller the record mark, the larger the reflectance of the virtual record cell formed without the record mark is the largest, and the reflectance of the virtual record cell with the largest record mark of 4 8 G is the smallest. More specifically, the above-mentioned light reflectance includes each record mark 4 The light transmittance of 8A to 4 8 G should be determined based on the occupancy of the virtual record cell 40. The light transmittance of the record label 4 8A to 4 8 G itself depends on the laser light of the constituent material of the recording layer 12 The light beam decomposes and degenerates, and its refractive index changes or changes with the thickness direction of the recording layer 12. If the light transmittance of the formed recording mark portion is zero, this may not be considered, and it is only based on the above occupation rate. By using the optical recording medium 10 of the above embodiment, it is possible to achieve multi-level recording of 5 or more steps by controlling the irradiation time. In particular, the groove width W and the track pitch P are set within a specific range, and recording can be performed with high accuracy and high density. Mark 4 8 A To 4 8 G. This means that the error of the target light reflectance and actual light reflectance of each layer is reduced. The sixth figure shows the analysis results of the inventors. Specifically, the groove width W is defined as Ling X ( λ / NA), prepare Q 値 different optical recording media, that is, most optical recording media with different groove widths, make multi-level recording for each recording medium, and analyze the SDR generated by the light reflectance variation of the virtual recording cell at this time 値The so-called SDR (Sigma to Dynamic Range) 値 is obtained from the multi-order reflectance and dynamic range (the difference between the maximum reflectance and the minimum reflectance) of each order, and the signal variation of each order. Specifically, the reflectance is Standard This paper size applies to China National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling this page)-Order printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives 17- Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the employee's consumer cooperative 583654 A7 __ —_ B7__ V. Description of the invention (, the deviation CT 'is normalized by the dynamic range, and the small variation can of course be used for recording and playing good signals. According to the inventor In experiments, the SDR 値 is preferably 5% or less, and more preferably 3% or less. The target is 2% or less. From this result, it is known that if the groove width W is / 3/20 · 25 or less, the SDR becomes large. The reason should be that if the groove width W is too narrow, the record marks 4 8 A to 4 8 G cannot be fully formed, or the actual reflectance level variation between virtual record cells of the same reflectance level significantly reduces the signal quality. It affects the light reflectance mainly determined by the record marks 4 8 A to 4 8 G on the occupancy of the virtual record cell 4 0. Otherwise, if the groove width W is large, there is a record mark with a low reflectance level (large record marks are not ) The formation of the virtual record cell 40, the reflectance variation increases, and the signal quality deteriorates. The track pitch P is set to, for example, a state of 1.0 micron, and the above-mentioned Q 値 is set to 0. 55 for a light recording medium. A schematic diagram of the state after multi-level recording is shown in FIG. 7. In this way, since the groove width W is sufficiently ensured, it is highly possible to form a desired large record mark of 4 8 A to 4 8 G. In contrast, because the width L of the base surface is narrowed, there is a possibility that the laser light spot D is crossed when the adjacent groove 16 is read, and the record marks 4 8 A to 4 8 G in the adjacent groove 16 are read at the same time. High, rare light reflectivity. That is, not only the current two recording methods, the groove width is set according to the type of recording layer, etc., for multi-level recording, the required groove width W must be set. If this groove width W setting is neglected, the result will be more The quality of the signal held by the stage is degraded, but the desired light reflectance can only be obtained if the precise setting of this embodiment is used. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back first) (Fill in this page again)

-18- 583654 A7 B7 V. Description of the invention (1 Also, if the error (slip) in the light reflectance is suppressed as above, the total number of steps width reduction (this is the 7th order from A to G) can be increased, and the optical recording medium The recording density can be further improved. As shown in FIG. 4 in this embodiment, even if a record mark of a length or width below the focused beam diameter D of the read laser is formed (all record marks here are 4 8 A to 4 8 G ), Can also fully read the data, so the recording density per unit area is greatly improved compared to the past. The example of this embodiment shows the case where all the recording marks are below the diameter D of the focused beam, but the invention is not limited to this It also includes the case where only a part of the recording marks are below the diameter D, or all the recording marks are above the diameter of the focused beam D. In addition, the above-mentioned optical recording device 30 displays the use of a laser driver 38 to set the laser beam irradiation. Time, but it is also possible to form record marks of different sizes by the irradiation power. The present invention is sufficient as long as it can control the irradiation of the laser beam, such as the use of an optical gate with adjustable beam penetration The irradiation time or irradiation power of the light beam may also be used. In the above embodiment, the recording layer 12 is used with organic pigments such as cyanine, but the present invention is not limited to this, and organic pigments or inorganic materials other than the above may be used, or other appropriate ones may be used. Materials can also be used. However, when using the above organic pigments, corresponding to the irradiation time of the laser beam 5th order or more, the size of the record mark can be changed and recorded, and each record mark can be read with high precision. When the above-mentioned optical recording device forms a recording mark, the size of the virtual recording cell 40 set on the recording layer 12 is not limited to the embodiment. The paper size is applicable to the China National Standard (CNS) A4 specification (210X297 mm)- -.------- Sai—I (Please read the notes on the back before filling out this page) I-Order Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs-19- 583654 A7 B7

V. Description of the invention (W. This shows the fact that the width of the virtual recording cell 40 is about the same as the groove width W, but if it can be compressed to be smaller than the waist diameter of the laser beam, for example, it is in the width of the groove 16 It does not matter if it is below W. The same applies to the length 另一方面. On the other hand, when the record mark is formed in more than eight steps, the size of the virtual record cell 40 can be set above the laser beam waist. Part of the record indicates that its size is above the beam diameter. In addition, the laser beam described above is made circular at the position of the recording layer 12, but it can also be as shown in Fig. 8, for example, the objective lens 4 2 Α 加Beam shaping 稜鏡 4 2 C, opening to make the shape of the beam become a short transport direction of the recording medium 10, an oval or a long line in the orthogonal direction. At this time, because the recording mark 4 9 is shortened, the virtual recording cell can be more Shortened. That is, the recording density is improved. Furthermore, the optical recording medium 10, as shown by the symbol 5 2 in FIG. 1, can form a plurality of pits with different reflectances in the order of signal modulation in advance, or the optical recording medium. A part of the recording medium is firstly subjected to multi-level recording using the optical recording method of the present invention. These multiple pits 5 2 and / or the multi-level recording part of the recording mark 5 4 can also record the individual identification information of the recording medium, identifying the information that it is a multi-level recording optical recording medium, to determine the recording playback Information such as the laser beam irradiation time required by the recording medium, information about the groove width W, and other specific information. The specific information can be effectively identified as a multi-level recording by playing and / or reading and writing during the recording of the optical recording medium. The optical recording medium used can be used for individual identification, and multi-level recording and playback can be more reliably performed. Generally, the media used for CD-R / RW or DVD-R / RW is input by recording the serpentine (sloshing) of the groove. This signal is called an address signal. By reading this signal, the recording device can move the recording head to a specific position. The paper size applies the Chinese National Standard (CNS) A4 specification (21 × 297 mm) (please read the back first) Please note this page before filling in this page) Order printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs-20- 583654 A7 ____ B7____

V. Description of the invention (A 〇 (Please read the notes on the back before filling out this page) For example, in CD-R / rw, the position signal is the minute and second time code of the recorded position. Time is read by the recording device. When the head is moved to the lead-in section, various data can be read and written. The multi-level optical recording medium of the present invention can use a shaking address signal when using a CD-R / RW recording device (for recording and playback). However, unlike the ordinary CD-R / RW time code, it uses a signal method such as an address code. The ordinary recording device cannot read an address signal different from the CD-R / RW, and the head cannot move to a specific position. (At this time, the multi-level recording optical media exits from the self-recording green device.) On the other hand, if the recording device used for multi-level recording is set to recognize the special address, the head can be moved to the lead-in section to read the signal. That is, the multi-level optical recording medium can be distinguished from other optical recording media because it uses a different address. The recording using the above shaking, for example, as shown in FIG. 9, is located in the lead-in area of the optical recording medium 10 with modulation. 1 0 2 Ditch 1 0 4 A to 104C shaking. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Specifically, as shown in Fig. 10, the shaking amplitude Wb is unchanged, and the shaking periods τα, ΤΒ, of each groove 104A, 104B, 104C are changed. TC. Take, for example, the wobble period T0 of the groove 16 in the user area 10 6 shown in FIG. 9 as the basic period, and the longer wobble period T B is “1”, and the shorter wobble periods TA and TC are The “0” bis signal records the above-mentioned various kinds of information. Therefore, for example, when the shaking period is the same as above, and it is “0”, “1”, “0” from the inner peripheral side of the optical recording medium, it means that the optical paper Standards apply to Chinese National Standard (CNS) A4 specifications (210X 297 mm) '-21-583654 A7 B7

V. Description of the invention (A recording medium 10 is for multi-level recording. (Please read the precautions on the back before filling out this page). Also, use the pre-determined information as above as the starting position information for recording. Recording can be started from a specific position in the user area 106. This is also a virtual recording of the starting position of the cell 40. In addition, other recording methods of the above-mentioned various information include, for example, as shown in FIG. The basal plane pre-pits 17 A formed on the basal planes 17 between the 16 grooves are recorded for example. The period between the basal plane pre-pits is "1" for short periods and "0" for long periods. Another example is shown in FIG. 12 or the symbol 5 6 in FIG. 1 'interrupt the trench 16 and lengthen the discontinued trench. For example, the short one is “1” and the old one is “0”. 9, 1 1, 12 The information of the information recording means shown in the figure 'makes it possible to read by the conventional Erji recording-type playback device' misinstalled in Erji recording-type playback and / or on the multi-level optical recording medium When recording the device, it is also easy to determine whether it is a multi-level type. Cooperatives print and again, the above-mentioned various information can be recorded in multiple levels in advance in, for example, the lead-in area 1 02 shown in Figure 13. At this time, the first 5 virtual record cells 4 0 1 to 4 in Figure 13 The record mark of 0 5 can be recorded as a multi-level recording medium and the order of the multi-level record. The next 5 record record marks of the virtual record cells 406 to 4 1 0 can be recorded for recording or playback. Recommended laser power, etc. These methods can be used alone or in combination. With the optical recording medium of the present invention, multi-level recording can be performed with the data for recording, and the signals read from its recording mark have good characteristics. This paper The dimensions are applicable to the Chinese National Standard (CNS) A4 specifications (210X297 mm) -22- 583654 A7 B7 V. Description of the invention () 0 Brief description of the drawing (please read the precautions on the back before filling this page) Figure 1 A partial cross-sectional side view of an important part of an optical recording medium according to an embodiment of the present invention. FIG. 2 is a block diagram of an optical recording device for recording information using a laser beam on the same optical recording medium. Laser included in the same optical recording device The block diagram of the actuator structure. Figure 4 is a schematic diagram of the relationship between the recording mark and the virtual recording cell and its light reflectance when the recording mark is formed on the recording layer by the same light recording device. Figure 5 is the same light recording When the device forms a recording mark on the recording layer, a line chart of the time chart generation process of the laser beam irradiation is performed. Figure 6 is a multi-level recording of optical recording media with different groove widths. SDR 値 line chart of change The picture is a side view of the state of the optical recording medium with an excessively wide groove after multi-level recording. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Figure 8 is a schematic side view of a laser beam irradiating a virtual circuit cell with other shapes. Figure 9 is an enlarged schematic diagram of shaking after the optical recording medium of the present invention has recorded various information in advance. Fig. 10 is a line diagram of the relationship between the shaking period of the shaking and the second signal. FIG. 11 is a schematic diagram showing the relationship between the pre-pit and the second signal of the base information in which the optical recording medium of the present invention has recorded various information. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -23- 583654 A7 _____B7 V. Description of the invention (4 The 12th figure is the length of the gap and the length of the interruption groove in which the optical recording medium of the invention has recorded various information Schematic diagram of the relationship of signals. (Please read the notes on the back before filling out this page.) Figure 1 3 is a schematic diagram of the virtual record cell and record label of the optical recording medium of the present invention that has recorded various information. [Schematic element description] 10 : Optical recording medium 12: Recording layer 1 4: Substrate 18: Reflective film 16: Laser light guide groove 2 0: Protective layer 4 0Virtual recording circuit cell 5: Circumferential direction: Unit length W: Groove width 48A ~ 48G : The record indicates that the paper printed by the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs is compliant with the Chinese National Standard (CNS) A4 specification (210 × 297 mm) -24-

Claims (1)

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 583654 A8 B8 C8 _ D8 々, patent application scope 1 1 · An optical recording medium, attached to a light-transmitting substrate with a specific groove, covering at least the groove, forming mainly by phthalocyanine The recording layer formed by the pigment is irradiated with a laser beam at least on the recording layer to form a recording mark to record information, and is characterized in that: on the recording layer, along the groove, in the direction of laser irradiation for recording and playback; And the virtual recording cell is continuously specified along the proceeding direction with an arbitrary unit length and an arbitrary unit width orthogonal to the virtual recording cell, and the wavelength of the laser beam is λ, and the laser beam is irradiated to the optical system When the number of objective lens openings is Ν Α, the groove width W is set to 0 · 25χ (λ / ΝΑ) &lt; W &lt; 〇 55χ (λ / ΝΑ), and at least one of the irradiation time or irradiation power is set to 5 Above the stage ', the above-mentioned laser beam can be used to form 5 or more different record marks on the virtual record cell. Based on the record mark, the virtual record Volume ratio of light reflectance modulation can be used for many information recording order. 2 _ The optical recording medium according to item 1 of the patent scope, wherein the above-mentioned groove width W is set to 0.30x (λ / ΝΑ) &lt; W &lt; 50x (λ / ΝΑ). 3. If the optical recording medium according to item 1 or 2 of the patent application scope, wherein the above-mentioned grooves are formed in a plurality and are substantially parallel to each other, the distance P between adjacent above-mentioned grooves is set to 0.65χ (λ / ΝΑ) &lt; P, preferably set to 0 · 7χ (λ / ΝΑ) &lt; P &lt; 1 · 2χ (λ / ΝΑ) (Please read the precautions on the back before filling this page) The scale of this paper applies the Chinese National Standard (CNS) μ scale (210 × 297 mm) 25