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WO2003003361A1 - Support d'enregistrement optique - Google Patents

Support d'enregistrement optique Download PDF

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Publication number
WO2003003361A1
WO2003003361A1 PCT/JP2002/006440 JP0206440W WO03003361A1 WO 2003003361 A1 WO2003003361 A1 WO 2003003361A1 JP 0206440 W JP0206440 W JP 0206440W WO 03003361 A1 WO03003361 A1 WO 03003361A1
Authority
WO
WIPO (PCT)
Prior art keywords
recording medium
film
optical recording
recording
group
Prior art date
Application number
PCT/JP2002/006440
Other languages
English (en)
Japanese (ja)
Inventor
Yuichi Sabi
Takashi Iwamura
Sakuya Tamada
Original Assignee
Sony Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Corporation filed Critical Sony Corporation
Priority to JP2003509450A priority Critical patent/JPWO2003003361A1/ja
Publication of WO2003003361A1 publication Critical patent/WO2003003361A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor

Definitions

  • the present invention relates to an optical recording medium, and in particular, aims to improve reproduction characteristics in a phase modulation type optical recording medium.
  • optical disc of a large-capacity optical recording medium which is now regarded as a next-generation optical recording medium
  • recording is performed from the side of the light transmission protection film formed on the recording surface to the recording surface, that is, through the light transmission protection film.
  • Standardization of blue-violet light on the surface and a numerical aperture NA of the objective lens of 0.85 is under study.
  • a large-capacity optical recording medium intended for so-called “live recording”, that is, only one recording is performed, and the recording is stably maintained for many years without being erased.
  • the recording film is based on a phase-change material, but as a recording film for a write-once-type large-capacity optical recording medium, as in CD-R.
  • the recording film is made of an organic dye material, the characteristics of the organic dye material constituting the recording film may vary.
  • CD-R and DVD-R which differ in the optical constants due to the difference in the organic dye material of the recording film, simply the recesses formed in the substrate, for example, a continuous group for tracking or Changing the depth of the intermittent group according to this difference in wavelength cannot optimize for obtaining excellent reproduction characteristics.
  • the track pitch of a large capacity optical recording medium is much smaller than that of a conventional optical recording medium.
  • the track pitch in CD is 1.6 m
  • the track pitch in a large-capacity optical recording medium is, for example, about 0.0S ⁇ m.
  • the problem is the inclination of the side wall of the tracking dull formed on the disk substrate.
  • concavities and convexities of groups or pits in a normal CD or the like is achieved by injection molding using a stamper having a concavo-convex pattern corresponding to the groups or pits in the production of a disc substrate, and the 2P method (Photopolymeri zation method). ) And the like.
  • This stamper is manufactured by mastering, that is, by mastering using a photo resist.
  • Pattern exposure on the photo resist in this master ring usually uses blue light or ultraviolet light. .
  • the pattern exposure by light described above causes the side wall surface of the group to form a gentle slope. Pine.
  • An object of the present invention is to provide an optical recording medium having excellent reproduction characteristics including high reproduction output in the above-mentioned write-once large-capacity optical recording medium.
  • the optical recording medium according to the present invention is formed by forming at least a metal film and a recording film made of an organic dye material on a substrate in which a concave portion is formed.
  • An optical recording medium on which at least reproduction is performed, and the depth of the concave portion is 15 ⁇ ! ⁇ 50 nm.
  • the organic dye material of the recording film is composed of an organic dye material having a refractive index n of 1.9 or more before recording with respect to light having a wavelength of 380 nm to 450 nm and causing a change in the refractive index after recording. I do.
  • the recording film has the same thickness on both the bottom surface of the concave portion and the upper surface of the convex portion between the concave portions.
  • an optimum signal output can be obtained in a write-once, large-capacity optical recording medium in which reproduction is performed by the above-described phase modulation method.
  • FIG. 1 is a sectional view showing the basic structure of an optical recording medium according to the present invention.
  • FIG. 2 is a cross-sectional view of a concave portion of an optical recording medium for explaining the present invention
  • FIG. 3 is a diagram showing a relationship between a group width and a signal amplitude for explaining the present invention
  • FIG. FIG. 5 is a schematic plan view showing a recording state in the optical recording medium according to the present invention
  • FIG. 5 is a diagram showing a reproduction signal level in a track length direction of the optical recording medium for explanation of the present invention.
  • FIG. 6 is a diagram showing the dependence of the signal amplitude of the optical recording medium on the groove depth for explaining the present invention
  • FIG. 7 is a graph showing the reflectance and the modulation factor of the optical recording medium for explaining the present invention.
  • FIG. 8 is a diagram showing the group depth dependency
  • FIG. 8 is a diagram showing the group depth dependency of the signal amplitude of the optical recording medium used for explaining the present invention
  • FIG. 9 is used for explaining the present invention.
  • FIG. 4 is a diagram showing the group depth dependence of the reflectance and the degree of modulation of an optical recording medium according to the present invention.
  • the optical recording medium according to the present invention can form a write-once, large-capacity optical disk, that is, the numerical aperture N.A. of the optical system is 0.85 ⁇ 0.05, and the wavelength power is 380 nm or more.
  • the configuration is such that a reproduction mode or a reproduction and recording mode using a laser in a blue-violet region of 450 nm can be adopted.
  • An optical recording medium 10 as shown in a schematic cross-sectional view of an example in FIG. 1, includes a concave portion 2 on a substrate 1 on which a continuous group for tracking or an intermittent group is formed.
  • a metal film 3, a recording film 4, and a dielectric film 5 are formed, and a light-transmitting protective film 6 on which a light-transmitting resin film having a thickness of, for example, 0.1 mm is formed by a spin coat is formed. It is formed by adhesion. '
  • the above-mentioned laser beam 9 in the blue-violet region is incident on the optical recording medium 1 Q from the light transmission protective film 6 side via the objective lens 11.
  • the protruding part on the side is referred to as the concave portion 2 (group)
  • the surface between these concave portions 2 on the side close to the laser light 9 incidence surface is referred to as the convex portion 7 (land).
  • the depth D of the recess 2 shown in FIG. 2 is set to 15 nm to 50 nm.
  • the recording film 4 has a characteristic that the refractive index n is 1.9 or more before recording, and is made of an organic dye material that changes the refractive index after recording.
  • the film thickness of the recording film 4 is formed by, for example, a vapor deposition film having the same film thickness in both the concave portion, that is, the bottom surface of the group 2 and the convex portion, that is, the upper surface of the land 7.
  • the optical recording medium according to the present invention uses the land as a recording area. This is because, for example, when the organic dye material constituting the recording film is vapor-deposited, the homogeneity of the recording film tends to be impaired in the recesses (groups), and this inhomogeneity causes noise. It is a recording area.
  • the optical recording medium according to the present invention will be described with reference to examples.
  • the concave portion 2 that is, the average width W of the group is 0.10 m to 0.14 m.
  • the average width W is set to 0.14 m.
  • the relationship between the average width W of the concave portion (group) and the reproduction signal amplitude is as shown in FIG. 3, and the average width W at which the reproduction signal amplitude is maximum is 0.10 im to 0.14 ⁇ m.
  • the width should be set as wide as possible in this range. The advantage is that even if the average width W deviates slightly from 0.14 m, there is almost no effect on the setting of the depth of the recess.
  • the track pitch is mainly involved in crosstalk, but the purpose of the present invention is to obtain the maximum output. In the present invention, a configuration for realizing this is specifically described. Is configured to set the depth of group 2.
  • the crosstalk can be made sufficiently small if the phase modulation mode with a narrow group width is used.
  • the track pitch is fixed to 0.6 m without crosstalk so that the detection signal can be easily evaluated. did.
  • the film thicknesses of the recording film 4 on the bottom surface of the group and the top surface of the land are made equal, they have the same complex reflectance with respect to the reflected light, that is, the returned light from these surfaces. .
  • the phase information of the reflected light can be the same as the case where the metal reflection film is simply formed.
  • the depth of the group is made deeper than 67 nm due to the above-described relationship to cope with such inconvenience, a problem arises in that the sidewall 2a is inclined in the formation of the group.
  • the inclination tan 0 of the side wall 2a shown in FIG. 2 is 1 to 2, and if the depth of the group is set to be deeper, for example, 100 nm, the average width W of the group is 0 If it is 14 m (140 nm), the land width will be 140 nm, and the slope of the side wall will occupy a considerable area.
  • the depth of the group that is, the concave portion 2 be as shallow as possible and that the side wall be as high as possible.
  • the present invention constitutes an optical recording medium which addresses such a point, and will be described with reference to examples.
  • a substrate 1 having irregularities on its surface is prepared by injection molding using a polycarbonate resin. That is, a concave portion 2 is formed by a tracking guide group having a depth of 20 nm on one main surface of the substrate 1, and a convex portion, that is, a land 7 is formed between adjacent concave portions 2 as a recording portion. did.
  • a metal film 3 of 30 nm in thickness of Ag is deposited, and a recording film 4 of an organic dye material with a thickness of 25 nm is formed thereon.
  • a dielectric film 5 of 100 nm thick SiN is formed thereon, and a light-transmitting protective film of 100 m thick ultraviolet curable resin is formed thereon. 6
  • An optical recording medium, that is, an optical disk in this example was produced by coating.
  • the dielectric film 5 serves as an isolation layer for preventing the reaction between the recording film 4 and the light-transmitting protective film 6 in an uncured state.
  • the optical constants of the organic dyes are expressed as n (refractive index) for the real part of the complex refractive index and k (extinction coefficient) for the imaginary part.
  • the thickness of the metal film 3 was sufficiently large, the reflectance of the recording film 4 before and after recording hardly changed, and the reflectance was about 50% in both cases.
  • the land 7 has 0.69 ⁇ ] 1 mark] ⁇ [and 0.69 ⁇ m space. This was recorded and reproduced.
  • Figure 5 shows the measurement results of the reproduced signal level.
  • the signal level is normalized with the light intensity incident on the optical disc as 1, and the horizontal axis represents the position X in the track length direction.
  • the largest modulation depth can be realized when the group depth D is around 2 Onm.
  • the reproduction signal characteristics are not optimized only by the signal amplitude. If the reflectivity is too low, focus and tracking servos cannot be applied. However, there is a problem that the shot noise of the light source becomes large and the servo becomes unstable.
  • a return light amount of at least 10% or more is required.
  • the modulation degree of a signal in an optical recording medium for example, an optical disc be 0.5 or more.
  • This degree of modulation is obtained by dividing the signal amplitude by the reflectance before recording. If the reflectance is high even if the signal amplitude is large, the return light after recording does not ideally decrease.
  • Figure 7 shows the results of measuring the depth of the group and the relationship between the reflectance (curve 71) and the modulation (curve 72) before recording.
  • the reflectivity decreases as the depth of the group increases, as the phase shift before recording approaches 7 ⁇ . It can be seen that in order for this reflectivity to be at least 10% as described above, the depth D of the group should be selected to be at most 40 nm.
  • the depth D at which the degree of modulation is 0.5 or more is 15 ⁇ m. That is, the depth D of the group, that is, the recess 2 is 15 ⁇ !
  • An ideal reproduction signal can be obtained by selecting a wavelength of about 40 nm.
  • the film thickness of the recording film 4 was about 25 nm in this embodiment, but this film thickness is extremely thin as compared with a film thickness of 200 nm or more in the case of CD-R. Therefore, such a configuration in which a sufficient modulation can be obtained with a thin film thickness is difficult to obtain with a conventional configuration. In other words, according to the present invention, there is an effect that the recording film can be made thin.
  • the return light amount of light irradiation on the optical recording medium is increased.
  • the thickness of the metal film 3 may be increased. However, if the thickness is too large, the recess 2, that is, the inside of the group is buried, which causes noise. In this example, the film configuration was changed.
  • Example 1 on a PC (polycarbonate) resin substrate 1 having grooves formed thereon, a 30 nm-thick Ag metal film 3 and an organic dye material 25 nm recording film 4, S
  • the dielectric film 5 and the light transmission protection film 6 are formed by 1 N.
  • the film thickness of the dielectric film 5 by SiN and the organic dye material of the recording film 4 are used. changed. That is, the thickness of the dielectric film 5 is
  • the substrate of the organic dye material of the recording film 4 was made of a triphenylamine derivative, the refractive index n for a wavelength of 450 nm before recording was 2.30, and the extinction coefficient was 0.134.
  • Figure 8 shows the measurement results of the relationship between the group depth D and the reproduced signal amplitude in this case.
  • FIG. 9 shows the measurement results of the group depth D and the relationship between the reflectance (curve 91) and the modulation factor (curve 92).
  • the amplitude is almost the same as that of the second embodiment, and the group depth D showing the maximum value is slightly shifted to about 25 nm.
  • the reflectivity is generally increased, and the group depth at which the reflectivity is 15% is about 50 nm, and the range where the modulation factor is 0.5 or more is about 25 nm.
  • an ideal reproduction signal can be obtained by selecting the depth D of the group, that is, the concave portion 2 from 25 nm to 50 nm.
  • the depth of the groove, that is, the concave portion 2 in the substrate 1 is in the range of 15 nm to 50 nm, and an optical recording medium from which a good reproduction signal can be obtained by selecting a film configuration. Is obtained.
  • an optical recording medium that can be applied to an optical system having the above-described short wavelength, ie, 380 ⁇ 111 to 450 0 11111, and high., Ie, 0.85 ⁇ 0.05, is realized. As a result, high-density recording becomes possible.
  • the optical recording medium is not limited to the above-described embodiment, but can be modified and changed. You can also take
  • the optical recording medium using the organic dye material according to the present invention as a recording film can be configured so as to obtain a sufficient reproduction output by selecting the depth of the concave portion of the substrate to be small.
  • the fabrication of the substrate is facilitated, and the problem of generation of noise due to inclination and roughness of the side wall when the depth of the concave portion is large is avoided.
  • the thickness of the recording film can be reduced to 20 nm on such a substrate, cost can be reduced, throughput can be improved, and cost can be reduced.
  • the thermal characteristics can be easily optimized, and a film can be formed by vapor deposition. In this way, according to the present invention, an optical recording medium applicable to the above-described short wavelength, high NA optical system can be realized, and high-density recording, that is, a large-capacity optical recording medium can be configured. It can be done.

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  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

L'invention concerne un support d'enregistrement optique comprenant au moins une première couche mince métallique (3) ainsi qu'une couche mince d'enregistrement (4) d'une matière de pigment organique formées séquentiellement sur un substrat (1) présentant des évidements (2), le support d'enregistrement optique de nouvelle génération du type WORM comprenant des évidements ayant des profondeurs sélectionnées pour se situer entre 15 nm et 50 nm, et présente des caractéristiques de reproduction excellentes notamment une sortie de reproduction élevée.
PCT/JP2002/006440 2001-06-27 2002-06-26 Support d'enregistrement optique WO2003003361A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003509450A JPWO2003003361A1 (ja) 2001-06-27 2002-06-26 光記録媒体

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001195054 2001-06-27
JP2001-195054 2001-06-27

Publications (1)

Publication Number Publication Date
WO2003003361A1 true WO2003003361A1 (fr) 2003-01-09

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005045818A1 (fr) * 2003-11-07 2005-05-19 Matsushita Electric Industrial Co. Ltd. Support d'enregistrement optique d'informations, procede d'enregistrement/de reproduction de support d'enregistrement optique d'informations, et appareil d'enregistrement/de reproduction
WO2006009107A1 (fr) * 2004-07-16 2006-01-26 Mitsubishi Kagaku Media Co., Ltd. Support d’enregistrement optique et méthode d’enregistrement optique de support d’enregistrement optique
JP2006205683A (ja) * 2005-01-31 2006-08-10 Toshiba Corp 記憶媒体、再生方法及び記録方法
JP2006236419A (ja) * 2005-02-22 2006-09-07 Toshiba Corp 記憶媒体、再生方法及び記録方法
JP2007026541A (ja) * 2004-07-16 2007-02-01 Mitsubishi Kagaku Media Co Ltd 光記録媒体及び光記録媒体の光記録方法
CN100570720C (zh) * 2004-07-16 2009-12-16 三菱化学媒体株式会社 光记录介质及光记录介质的光记录方法
US8114496B2 (en) 2006-01-13 2012-02-14 Mitsubishi Kagaku Media Co., Ltd. Optical recording medium
US8473973B2 (en) 2003-07-11 2013-06-25 Koninklijke Philips Electronics N.V. Recordable optical record carrier

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JP2002150614A (ja) * 2000-11-10 2002-05-24 Pioneer Electronic Corp 光ディスク

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US8473973B2 (en) 2003-07-11 2013-06-25 Koninklijke Philips Electronics N.V. Recordable optical record carrier
WO2005045818A1 (fr) * 2003-11-07 2005-05-19 Matsushita Electric Industrial Co. Ltd. Support d'enregistrement optique d'informations, procede d'enregistrement/de reproduction de support d'enregistrement optique d'informations, et appareil d'enregistrement/de reproduction
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US8780685B2 (en) 2005-01-31 2014-07-15 Kabushiki Kaisha Toshiba Information storage medium, reproducing method, and recording method
US8787138B2 (en) 2005-01-31 2014-07-22 Kabushiki Kaisha Toshiba Information storage medium, reproducing method, and recording method
US8787139B2 (en) 2005-01-31 2014-07-22 Kabushiki Kaisha Toshiba Information storage medium, reproducing method, and recording method
US8792320B2 (en) 2005-01-31 2014-07-29 Kabushiki Kaisha Toshiba Information storage medium, reproducing method, and recording method
US8817586B2 (en) 2005-01-31 2014-08-26 Kabushiki Kaisha Toshiba Information storage medium, reproducing method, and recording method
US8942076B2 (en) 2005-01-31 2015-01-27 Kabushiki Kaisha Toshiba Information storage medium, reproducing method, and recording method
US8942077B2 (en) 2005-01-31 2015-01-27 Kabushiki Kaisha Toshiba Information storage medium, reproducing method, and recording method
US8958279B2 (en) 2005-01-31 2015-02-17 Kabushiki Kaisha Toshiba Information storage medium, reproducing method, and recording method
US8971165B2 (en) 2005-01-31 2015-03-03 Kabushiki Kaisha Toshiba Information storage medium, reproducing method, and recording method
US9036457B2 (en) 2005-01-31 2015-05-19 Kabushiki Kaisha Toshiba Information storage medium, reproducing method, and recording method
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