WO2002086881A1 - Support d'enregistrement d'informations optique et procede de reproduction d'informations - Google Patents

Support d'enregistrement d'informations optique et procede de reproduction d'informations Download PDF

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Publication number
WO2002086881A1
WO2002086881A1 PCT/JP2002/003882 JP0203882W WO02086881A1 WO 2002086881 A1 WO2002086881 A1 WO 2002086881A1 JP 0203882 W JP0203882 W JP 0203882W WO 02086881 A1 WO02086881 A1 WO 02086881A1
Authority
WO
WIPO (PCT)
Prior art keywords
information recording
information
optical
recording medium
recording layer
Prior art date
Application number
PCT/JP2002/003882
Other languages
English (en)
Japanese (ja)
Inventor
Tsutomu Ishimoto
Kimihiro Saito
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
Publication of WO2002086881A1 publication Critical patent/WO2002086881A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • 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

Definitions

  • the present invention relates to an optical information recording medium such as an optical disk for recording and reproducing various information using light, and an information reproducing method for reproducing information from the optical information recording medium.
  • optical information recording media for optically recording or reproducing various information.
  • optical disk for example, in the case of a read-only medium, information is formed on the surface of the optical disk by a group of minute irregularities called pits, and the diffraction phenomenon of reflected light when the surface of the optical disk is irradiated with light is used. Read the pit pattern and reproduce the recorded information.
  • a material (reflection film) that shows high reflectivity is formed on the pit pattern to increase the amount of reflected light.
  • FIGS. 8G to 8H are explanatory views showing a process for manufacturing an optical disk having a conventional reflective film.
  • FIG. 7A the glass master 1 is polished and cleaned.
  • a photoresist 2 is applied on the cleaned glass master 1, and in FIG. 7C, a laser 3 modulated by recording information is focused on the photoresist 2 by the objective lens 4. Record the information.
  • FIG. 7D the glass master 1 on which recording has been completed is developed. At this time, for example, only the portion of the resist irradiated with the laser beam is dissolved by the developer. As a result, a resist pattern of a pit pattern corresponding to the recorded information is formed on the glass master 1.
  • nickel is vapor-deposited on the developed glass master 1 to form a nickel plating layer 17. Then, after the deposition is completed, the nickel plating layer 17 is separated from the glass master 1 to transfer the irregularities on the glass master 1 to the nickel plating layer 17 (this is referred to as a stamper).
  • the pit information on the stamper 17 is transferred to the transparent resin disk substrate 14 by the glass 2P method or the like.
  • a reflection film 15 (for example, an aluminum film) is formed on the disk substrate 14.
  • a protective film 16 is formed on the reflective film 15 so as to fill the irregularities.
  • gap control is performed using a light amount component that is polarized perpendicular to the near-field incident polarized light.
  • this method enables a gap control even for an optical disk having a reflective film formed on a pit pattern. is there.
  • the disc does not have a protective film and the reflective film is placed on the top layer of the optical disc, the impact of the defect on the optical disc once causes the objective lens end face to collide with the optical disc. There is a danger that the reflective film will adhere to the surface.
  • an object of the present invention is to provide an optical information recording medium capable of reproducing information without providing a reflective film, and an information reproducing method capable of reproducing information on the optical information recording medium. Disclosure of the invention
  • the present invention has a structure in which a transparent unevenness as an information recording layer is provided on the surface of a transparent substrate, and near-field light is irradiated from the surface side of the transparent substrate to form the information recording layer. It is characterized in that information is reproduced by the amount of total reflection return from the light source.
  • the present invention provides an information reproducing apparatus that at least reproduces information from an optical information recording medium, wherein the optical information recording medium has a group of transparent irregularities as an information recording layer on a surface of a transparent substrate, By irradiating near-field light from the surface side of the transparent substrate, information is reproduced by the amount of total reflection and return light from the information recording layer.
  • the optical information recording medium of the present invention by irradiating the near-field light to the group of transparent irregularities provided on the transparent substrate, the amount of return light is detected, and the reproduction of the information by the irregular irregularities is performed. Can do it.
  • the reflective film is not required for the optical information recording medium, the reflective film is not damaged, and a part of the reflective film does not adhere to the information reproducing apparatus, so that a stable reproducing operation can be secured.
  • the information reproducing method of the present invention by irradiating near-field light to an optical information recording medium having a group of transparent irregularities provided on a transparent substrate, the amount of return light is detected, and the pattern of irregularities is detected. Information can be reproduced.
  • FIGURES 1A to 1B are cross-sectional views showing specific examples of an optical information recording medium (optical disc) according to an embodiment of the present invention.
  • FIGS. 1A to 1B are explanatory views showing the manufacturing steps of the optical disk shown in FIGS. 1A to 1B.
  • FIGS. 3A to 3B are explanatory diagrams showing the outline of the gap control using total reflection light in the information reproducing operation of the information reproducing apparatus using the optical disc shown in FIGS. 1A to 1B. It is.
  • FIG. 4 is an explanatory diagram showing the relationship between the distance between the SIL and the disk and the total reflection return light amount in the information reproducing operation using the optical disk shown in FIGS. 3A to 3B.
  • FIG. 5 is an explanatory diagram showing a state of the gap control when information is recorded as a pit pattern on the surface of the optical disc in the gap control shown in FIGS. 3A to 3B.
  • FIG. 6 is an explanatory diagram showing levels of total reflection return light at lands and pits in an information reproducing operation using the optical disc shown in FIGS. 3A to 3B.
  • 7A to 7F are explanatory diagrams showing a process of manufacturing a conventional optical disc having a reflective film.
  • 8G to 8H are explanatory views showing a manufacturing process of an optical disc having a conventional reflective film.
  • FIG. 1A is a sectional view showing a first example of the optical information recording medium according to the embodiment of the present invention.
  • the optical information recording medium of the present example is formed as an optical disc such as a CD or a DVD.
  • the optical disk 107 of this example has a transparent irregular group (pit pattern) 112 A as an information recording layer on the surface of a transparent substrate 112 made of resin. Provided with a protective film 106.
  • this optical disc 107 simplifies the manufacturing process by omitting the conventional reflective film 15 shown in FIG. 8G.
  • the protective film 106 of the optical disk 107 is not provided in such a manner as to fill the unevenness of the pit pattern unlike the conventional protective film 16 shown in FIG. 8H. This is provided in a thin film on the pit pattern 112A while maintaining the uneven shape. This protective film 106 needs to be transparent. This necessity will be described later.
  • 2A to 2G are explanatory diagrams showing the manufacturing steps of the optical disc 107 in this example.
  • FIG. 2A the glass master 101 is cleaned at the polishing point.
  • a photoresist 102 is applied on the cleaned glass master 101
  • FIG. 2C a laser 103 modulated by the recorded information is applied by the objective lens 104.
  • the light is focused on the photoresist 102 and the information is recorded.
  • near-field light can be used as a beam for irradiating the resist 102.
  • the glass master 101 on which recording has been completed is developed.
  • the resist in the portion irradiated with the laser beam is dissolved by the developing solution.
  • a resist pattern of a pit pattern corresponding to the recorded information is formed on the glass master 101.
  • a nickel plating layer 117 is formed on the developed glass master 101 by depositing an etchant. Then, by removing the nickel plating layer 117 from the glass master 101 after the vapor deposition is completed, the irregularities on the glass master 101 are transferred to the nickel plating layer 117 (this is referred to as a stamper).
  • the pit information on the stamper 117 is transferred to a transparent resin disk substrate 112 by a glass 2P method or the like.
  • a thin transparent protective film 106 is formed on the disk substrate 112 without damaging the unevenness of the pit pattern 112A.
  • the step shown in FIG. 8G is not required, and the manufacturing process can be simplified accordingly. .
  • a protective film 106 was further provided.
  • the configuration shown in FIG. 8 It is also possible to omit the protective film 106 as shown in FIG. 8.Therefore, in this case, the two steps shown in FIGS. 8G and 8H become unnecessary, and the manufacturing process is further simplified. It becomes possible. Therefore, the omission of one or two steps can shorten the production tact time and reduce the production cost.
  • a rewritable optical disk can be manufactured by simply duplicating the optical disk recorded by the recording laser 103, and the thickness of the reflective film that affects the signal quality can be produced. There is no need to consider the uniformity of the material, which greatly facilitates manufacturing.
  • 3A to 3B are explanatory diagrams schematically showing the gap control using the totally reflected light. This gap control is disclosed by the applicant of the present invention in Japanese Patent Application No. Hei.
  • the head of the information reproducing apparatus using near-field light of this example uses, for example, a solid immersion lens (SIL) as an objective lens.
  • SIL solid immersion lens
  • the SIL is used in combination with a condenser lens (not shown) for allowing light to enter the SIL (two-group lens). Is selected.
  • FIG. 3A shows the appearance of incident light when in a non-dual-field region.
  • the non-near-field area means that the distance between the end face (disc side) of the SIL 108 and the optical disc 107 is generally about half the wavelength ⁇ of the input waveform, for example, 2 It is a region at a distance exceeding 0 O nm. '
  • the light incident on the SIL 108 at an angle equal to or greater than the total reflection angle is totally reflected at the end face of the SIL 108, and the total amount of incident light returns as return light 109 Will come.
  • FIG. 3B shows the state of the incident light when in the near-field region.
  • This near-field area is the end face of SIL 108
  • the distance between the optical disk 107 and the optical disk 107 is, for example, a region where the distance is less than 200 nm as a typical value.
  • part of the light incident on the SIL 108 at an angle equal to or greater than the total reflection angle is not totally reflected on the end face of the SIL 108, and the near-field light 1 10 0 Seep into 7.
  • the permeated near-field light 110 penetrates into the optical disc 107 without being reflected on the surface of the optical disc 107.
  • FIG. 9 is an explanatory diagram showing a relationship between a distance between the optical disk and the amount of return light 109, wherein the horizontal axis represents the distance between the SIL and the disk, and the vertical axis represents the return light level.
  • the units on the horizontal axis and the vertical axis (A.U.) indicate that they can be arbitrarily selected.
  • the amount of total reflection return light is zero.
  • the distance between the end face of the SIL 108 and the optical disc 107 is fixed to the distance at which the near-field light 110 is generated as described above. Need to be kept.
  • FIG. 4 gap control is performed using the return light quantity as a controlled quantity using the area 111 where the relationship between the distance between the SIL 108 and the optical disc 7 and the return light quantity is linear.
  • FIG. 5 is an explanatory diagram showing a state of the gap control when information is recorded as a pit pattern on the surface of the optical disc 107.
  • the distance between the SIL 108 and the optical disc 107 is reduced at the land 113, and the SIL 108 and the optical disc are reduced at the pit 114.
  • the distance to 107 increases.
  • the repetition frequency of the pit pattern (generally several MHz) is sufficiently higher than the gap control band (generally several kHz), so that the gap control does not follow the pit pattern.
  • the distance between the optical disk 107 and the average height of the land 113 and the pit 114 and the end face of the SIL 108 is a fixed distance (SIL end face control). (Level) 1 1 6 will be held.
  • FIG. 6 is an explanatory diagram showing the total reflection return light level in the land portion 113 and the pit portion 114.
  • the horizontal axis shows the distance between the SIL and the disk, and the vertical axis shows the return light level. Is shown.
  • information recorded as a pit pattern can be reproduced from a difference between each signal level in the land section 113 and the pit section 114.
  • the optical disk 107 When the optical disk 107 is transparent and the pit pattern is also transparent, the relationship shown in FIG. 4 is always established, so that the gap control can be performed stably and the pit pattern can be controlled. The information recorded as is reproducible.
  • the gap control and the recording and reproduction of information are performed by the distance between the end face of the SIL and the disk, so that when forming the protective film 106, The shape must not lose the pit pattern.
  • the protective film 106 also needs to be transparent.
  • the surface of the optical disc 107 does not have a reflective film as in the related art and is transparent, even if the protective film 106 is not provided, even if the end face of the SIL 108 collides with the optical disc 107.
  • a reflective film of aluminum or the like having low hardness generally does not adhere to the end face of the SIL 108, and the gap control does not break down.
  • the protective layer 106 if a protective film material having high hardness is used, it is possible to prevent the protective film 106 from adhering to the end face of the SIL 108 in the same manner, thereby preventing the gap control from being broken. .
  • the present invention is not necessarily limited to a reproduction-only device, and an apparatus having a recording function by means different from the above-described reproducing function.
  • c it is also possible to mount, in the above example has been described with an example of using the SIL as the optical means of the head portion, similarly can have use a SIM (Solid Immersion Mirror).
  • the optical information recording medium of the present invention is applied to an optical disk.
  • the present invention is not limited to a disk-shaped medium, and is similarly applied to, for example, a card-shaped optical medium. What you get.
  • the optical information recording medium of the present invention by irradiating near-field light to a group of transparent irregularities provided on a transparent substrate, the amount of return light is detected, and information based on the irregularity pattern is obtained. Can be reproduced. Therefore, information can be reproduced without providing a reflective film on the optical information recording medium, and the step of forming the reflective film can be omitted in the operation of manufacturing the optical information recording medium. As a result, the manufacturing cost of the optical information recording medium can be reduced, and the manufacturing tact time can be shortened.
  • the reflective film is not required for the optical information recording medium, the reflective film is not damaged, and a part of the reflective film does not adhere to the information reproducing apparatus, so that a stable reproducing operation can be secured.
  • the information reproducing method of the present invention by irradiating near-field light to an optical information recording medium having a group of transparent irregularities provided on a transparent substrate, the amount of return light is detected, and the pattern of irregularities is detected. Information can be reproduced.
  • the reflective film is not required for the optical information recording medium, the reflective film is not damaged, and a part of the reflective film does not adhere to the information reproducing apparatus, so that a stable reproducing operation can be secured.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Nanotechnology (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Head (AREA)

Abstract

L'invention concerne un procédé de reproduction d'informations destiné à reproduire des informations à l'aide d'un support d'enregistrement d'informations optique dépourvu de couche mince de réflexion. Un disque optique (107) présente un type de creux transparent (112A) constituant une couche d'enregistrement d'informations sur la surface d'un substrat transparent (112) et ce type de creux (112A) est recouvert d'une couche mince de protection (106). Ainsi, la couche mince de réflexion classique n'est pas nécessaire. Un SIL (108) est agencé à proximité du disque optique (107) de manière à détecter le type de creux (112A) à l'aide d'une lumière de champ voisin. Etant donné que la couche mince de réflexion est éliminée du disque optique (107), l'étape de production peut être simplifiée, le coût de production peut être réduit et le temps takt de production peut être diminué. De plus, étant donné que le disque optique (107) ne nécessite aucune couche mince de réflexion, il n'y a aucun danger de détérioration de la couche mince de réflexion ni d'adhésion d'une partie de ladite couche mince de réflexion à l'appareil de reproduction d'informations. Ainsi, il est possible d'obtenir une opération de reproduction stable.
PCT/JP2002/003882 2001-04-19 2002-04-18 Support d'enregistrement d'informations optique et procede de reproduction d'informations WO2002086881A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-120522 2001-04-19
JP2001120522A JP2002319140A (ja) 2001-04-19 2001-04-19 光情報記録媒体及び情報再生装置

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WO2002086881A1 true WO2002086881A1 (fr) 2002-10-31

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0231348A (ja) * 1988-07-21 1990-02-01 Nec Home Electron Ltd 光ディスク及びその製造方法
JPH0273540A (ja) * 1988-09-09 1990-03-13 Nec Corp 光ディスク
JPH05151644A (ja) * 1991-06-04 1993-06-18 Internatl Business Mach Corp <Ibm> 光学的データ記憶媒体
JP2000149313A (ja) * 1998-11-04 2000-05-30 Nikon Corp 光記録再生装置及び光ｒｏｍディスク
JP2002117581A (ja) * 2000-10-05 2002-04-19 Ricoh Co Ltd 表面読み出し型光読み出し専用媒体及び読みとり装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0231348A (ja) * 1988-07-21 1990-02-01 Nec Home Electron Ltd 光ディスク及びその製造方法
JPH0273540A (ja) * 1988-09-09 1990-03-13 Nec Corp 光ディスク
JPH05151644A (ja) * 1991-06-04 1993-06-18 Internatl Business Mach Corp <Ibm> 光学的データ記憶媒体
JP2000149313A (ja) * 1998-11-04 2000-05-30 Nikon Corp 光記録再生装置及び光ｒｏｍディスク
JP2002117581A (ja) * 2000-10-05 2002-04-19 Ricoh Co Ltd 表面読み出し型光読み出し専用媒体及び読みとり装置

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