WO2006073169A1 - Disque optique et dispositif de disque optique - Google Patents

Disque optique et dispositif de disque optique Download PDF

Info

Publication number
WO2006073169A1
WO2006073169A1 PCT/JP2006/300063 JP2006300063W WO2006073169A1 WO 2006073169 A1 WO2006073169 A1 WO 2006073169A1 JP 2006300063 W JP2006300063 W JP 2006300063W WO 2006073169 A1 WO2006073169 A1 WO 2006073169A1
Authority
WO
WIPO (PCT)
Prior art keywords
information recording
recording layer
optical disc
layer
optical
Prior art date
Application number
PCT/JP2006/300063
Other languages
English (en)
Japanese (ja)
Inventor
Takashi Ishida
Original Assignee
Matsushita Electric Industrial Co., Ltd.
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 Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2006073169A1 publication Critical patent/WO2006073169A1/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
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers

Definitions

  • the present invention relates to an optical disc provided with two information recording layers and an optical disc apparatus that performs recording or reproduction on the optical disc.
  • Non-Patent Document 1 Japanese Industrial Standard JIS X 6241
  • a dual-layer disc with the same capacity for each layer places additional restrictions on the content it can accommodate.
  • applications such as recording a movie in standard quality on one layer and recording a movie in high quality on the other layer.
  • This application is in demand because it has the advantage of not having to create two discs of standard and high quality in the same movie.
  • the current two-layer discs with the same capacity of each layer use the capacity of one layer with standard image quality, and in order to record a cut movie with high image quality on the other layer, the capacity exceeds the capacity of each layer. It is inconvenient because it is necessary.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a two-layer optical disc that can accommodate different capacities in each layer.
  • the optical disc of the present invention has a first information recording layer and a second information recording layer having the same light incident surface for reproduction or recording.
  • the first information recording layer exists at a position approximately t from the surface of the light incident surface.
  • the second information recording layer exists at a position approximately t ′ from the surface of the light incident surface. . t 'and t have a relationship of t' ⁇ 0.5t.
  • the data capacity of the second information recording layer is larger than the data capacity of the first information recording layer.
  • the first information recording layer is disposed at a position t from the light incident surface
  • the second information recording layer is disposed at a position t ′ where t ′ ⁇ 0.5t.
  • a light spot having a diameter smaller than that of the light spot used for the first information recording layer can be used for reproduction or recording of the second information recording layer. Therefore, the data capacity of the second information recording layer can be made larger than that of the first information layer.
  • FIG. 1 shows a structure of an optical disc according to Embodiment 1 of the present invention.
  • FIG. 2 is a graph showing the relationship between the light source wavelength and numerical aperture used for the first information recording layer and the light source wavelength and numerical aperture used for the second information recording layer.
  • FIG. 3 is a block diagram showing an outline of an optical disc apparatus.
  • FIG. 4 is a flowchart for explaining a reproducing operation of the optical disc apparatus.
  • FIG. 1 shows the structure of a double-layer optical disc according to Embodiment 1 of the present invention.
  • 101 is a substrate
  • 102 is a first information recording layer
  • 103 is a space layer such as adhesive resin
  • 104 is a second information recording layer
  • 105 is a light transmitting layer
  • 106 is a light incident surface. It is.
  • laser light is irradiated from the light incident surface 106, and the first information recording layer 10 Data is recorded on or reproduced from the second and second information recording layers 104.
  • the first information recording layer 102 has a position of light incident surface 106 force t
  • the second information recording layer 104 has t, In position.
  • t 'and t have a relationship of t, ⁇ 0.5t.
  • the light source wavelength of the optical head for reproducing or recording the first information recording layer 102 is obtained, the numerical aperture of the objective lens is NA, and the light source wavelength of the optical head for reproducing or recording the second information recording layer 104 And the numerical aperture of the objective lens is NA.
  • the amount of coma aberration when the disc is tilted The conditions for equality when reproducing or recording the first information recording layer 102 and when reproducing or recording the second information recording layer 104 are:
  • the first information recording layer 102 and the second information recording layer 104 can be reproduced or recorded with the same degree of stability.
  • Figure 2 shows the range of ( ⁇ / ⁇ ') and (NA, / NA) 3 satisfying the above equation, with the vertical axis ( ⁇ ⁇ ') and the horizontal axis ( ⁇ '/ NA) 3. Shown with diagonal lines.
  • the diameter of the formed light spot is proportional to the light source wavelength and inversely proportional to the numerical aperture. For this reason, if the light spot diameter in the first information recording layer 102 is W and the light spot diameter in the second information recording layer 104 is W ′,
  • the diameter of the light spot on the second information recording layer 104 becomes smaller.
  • the second information recording layer 104 can accommodate more pits than the first information recording layer 102. That is, the data capacity of the second information recording layer 104 can be made larger than the data capacity of the first information recording layer 102.
  • t ′ and t may be in a range satisfying (t ′ Zt) ⁇ 0.25.
  • the explanation for this equation is given below.
  • the second information recording layer 104 needs to have a capacity of 21.6 GB or more. . This is derived from the following calculation.
  • the light source wavelength is 650 nm
  • the numerical aperture NA 0.60
  • the distance from the light incident surface 106 t 0 6mm.
  • the diameter of the light spot formed at this time is W.
  • the light source wavelength ⁇ ′ used for the second information recording layer 104 is set to 405 nm, which is the shortest wavelength of a semiconductor laser that can be mass-produced at the present time. Furthermore, the numerical aperture of the objective lens is NA ′, the distance from the light incident surface 106 is t, and the diameter of the light spot formed at this time is W.
  • the light spot diameters W and W ′ satisfy the following relationship: There is a need.
  • the diameter of the formed light spot is proportional to the wavelength of the light source and inversely proportional to the numerical aperture, so that W and W ′ further satisfy the following relationship.
  • (W / W) (X '/ ⁇ ) ⁇ ( ⁇ / ⁇ ')
  • the above relationship is applied to the following equation.
  • the following equation shows that the condition for reproducing or recording the first information recording layer 102 and the second information recording layer 104 with the same degree of stability, that is, the coma aberration amount when the disc is tilted, is This condition is the same when the information recording layer 102 and the second information recording layer 104 are reproduced or recorded.
  • t ′ and t may be in a range satisfying (t′Zt) ⁇ 0.25.
  • the first information recording layer 102 can be reproduced by a DVD player, and the second information recording layer 104 can be reproduced by a BD player.
  • the data capacity of the first information recording layer 102 can be set to 4.7 GB
  • the data capacity of the second information recording layer 104 can be set to 25 GB. According to this, for example, it is possible to record a digital transmission at a transfer rate of 24 Mbps on the second information recording layer 104 for two hours or more, and further, the first information recording layer 102 has other contents. Can be recorded.
  • the second information recording layer 104 further has the following characteristics. That is, the reflectance of the second information recording layer 104 at the wavelength for reproducing the first information recording layer 102 is smaller than the reflectance of the light incident surface 106 at this wavelength.
  • the second information recording layer 104 having such properties can be obtained, for example, by laminating dielectric layers having different refractive indexes. In such a second information recording layer 104, the light interference effect by the laminated thin film is obtained. The reflectance is adjusted using the fruit.
  • the “wavelength for reproducing the first information recording layer 102” is, for example, 650 nm.
  • For reproducing the second information recording layer 104 for example, a wavelength of 405 nm is used.
  • the second information recording layer 104 having such characteristics is transparent to a wavelength (for example, 650 nm) for reproducing the first information recording layer 102, and the reproduction of the first information recording layer 102 is performed. It has the advantage of being almost unaffected.
  • each of the first information recording layer 102 and the second information recording layer 104 is a single layer, but the first information recording layer group is composed of a plurality of the same capacitance layers.
  • the second information recording layer group may also be used.
  • the information related to the first information recording layer 102 may be recorded in the second information recording layer 104.
  • the information regarding the first information recording layer 102 may be information for identifying whether or not the first information recording layer 102 exists.
  • Sarasako can record the attribute information of the first information recording layer 102, for example, information indicating whether the first information recording layer is a DVD format or a CD format, or whether the first information recording layer is a read-only layer. It may be information indicating whether it is a layer or a rewritable layer.
  • This information is recorded on the second information recording layer 104 in the form of uneven pits or wobbles.
  • the case where the first information recording layer 102 is recorded on the second information recording layer 104 has been described, but conversely, the second information recording layer 104 is recorded on the first information recording layer 102. Information may be recorded.
  • FIG. 3 is a block diagram showing an outline of the optical disc apparatus 600. As shown in FIG. 3
  • reference numeral 601 denotes an optical disk.
  • the optical disc 601 has the structure described in Embodiment 1 or 2.
  • the optical disc device 600 is a light having a conventional structure. It may be possible to record on a disc, for example a single layer optical disc.
  • 602 is a semiconductor laser
  • 603 is a collimating lens
  • 604 is a beam splitter
  • 605 is a converging means
  • 606 is a condenser lens
  • 607 is a light detecting means
  • 608 is a reproduction signal calculating means
  • 609 is a focus control means
  • 610 Tracking control means
  • 611 is an actuator
  • 612 is a controller
  • 613 is laser driving means
  • 615 is a signal processing unit.
  • the semiconductor laser 602, the collimating lens 603, the beam splitter 604, the converging means 605, the condensing lens 606, the light detecting means 607, the activator 611, and the like constitute an optical head.
  • the optical head driving means is constituted by the focus control means 609, tracking control means 610, laser one driving means 613 and the like.
  • the reproduction signal calculation means 608, the controller 612, etc. constitute control means.
  • the optical head 600 can irradiate two different wavelengths. Specifically, for example, there are two wavelengths, X (for example, 605 nm) for reproducing the first information recording layer 102 and wavelength Y (for example, 405 nm) for reproducing the second information recording layer 104. It is possible to irradiate a wavelength. Furthermore, two systems of optical head driving means for processing it may be provided.
  • the optical disc 601 is an optical disc having two information surfaces, and the light spot is converged on one of the two information surfaces of the optical disc 601, and information is read out.
  • the light beam emitted from the semiconductor laser 602 passes through the collimator lens 603, the beam splitter 604, and the converging means 605 and is condensed on one of the two information surfaces on the optical disc 601.
  • the condensed light spot is reflected and diffracted on the optical disc 601, passes through the converging means 605, the beam splitter 604, and the condensing lens 606, and is condensed on the light detecting means 607.
  • the collected light outputs a voltage signal corresponding to the light quantity of each light receiving element A, B, C, D on the light detection means, and the reproduction signal calculation means (reproduction signal calculation circuit) 608 outputs the voltage signal. Calculate.
  • the FE signal that is the output of the reproduction signal calculation means 608 is transmitted to the focus control means 609.
  • the TE signal that is the output of the reproduction signal calculation means 608 is sent to the tracking control means 610. Sent.
  • the RF signal that is the output of the reproduction signal calculation means 608 is transmitted to the controller 612.
  • the focus control means 609 drives the actuator 611 by voltage output corresponding to the FE signal, and controls the focal position of the light spot on one of the two information surfaces of the optical disc 601.
  • the tracking control means 610 drives the actuator 611 with a voltage output according to the TE signal, and controls the tracking position of the light spot to a desired track position on one of the two information surfaces of the optical disc 601. .
  • the optical spot was recorded on the optical disc by reading out the concave and convex prepits on the optical disc or the dark and light marks and spaces with different reflectivities of the phase change optical disc by the light spot with focus position control and tracking position control. Read information.
  • the controller 612 detects which surface of the two information surfaces on the optical disc 601 is converged according to the RF signal. More specifically, the controller 612 detects which surface is converged by the address value.
  • the controller 612 controls the focus control means 609, the tracking control means 610, and the laser drive means 613.
  • the control means first determines the second information recording layer 104 with a wavelength Y (wavelength with respect to the second information recording layer 104).
  • the area is played back (step S301).
  • the predetermined area is an area in which information related to the first information recording layer 102 described in the second embodiment is recorded.
  • the control means acquires information (hereinafter referred to as an identifier) for identifying whether or not the first information recording layer 102 exists (step S302).
  • the control means interprets the acquired identifier and determines whether or not the first information recording layer 102 exists (step S303).
  • control means reproduces the second information recording layer ( Step S 304).
  • the control means determines whether or not the instructed reproducing operation is for the first information recording layer 102 (step S305).
  • the instruction that the reproduction operation is for the first information recording layer 102 may be selected in advance when the user instructs the reproduction operation, or the determination result in step S303 is positive. In such a case, the control means may prompt the user to make a selection and the user may instruct accordingly.
  • control means reproduces the second information recording layer (step S306).
  • control means reproduces the first information recording layer 102 (step S307).
  • the second information recording layer 104 is first reproduced with the wavelength Y regardless of whether or not the optical disc 601 includes two layers.
  • the optical disc 601 of the present invention an identifier is recorded, and by first reproducing the second information recording layer 104, the structure of the optical disc can be understood. For this reason, it is possible to shorten the time until the start of reproduction.
  • the laser irradiation conditions for reproducing the first information recording layer 102 and the recording information are recorded. It is also possible to adjust the recording pulse conditions for this, and more appropriate optical disc processing becomes possible.
  • optical disc device 600 when the optical disc 601 stores different contents in each information recording layer, the user can select each.
  • the first information recording layer is disposed at a position t from the light incident surface, and the second information recording layer is disposed at a position t' ⁇ 0.5t.
  • An optical spot having a diameter smaller than that of the first information recording layer can be used for reproducing or recording the second information recording layer, so that the data capacity of the second information recording layer can be increased. It becomes possible to set.

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

La présente invention concerne un disque optique à deux couches dont chacune présente une capacité d'enregistrement de données différente. Le disque optique comprend une première couche d'enregistrement de données (102) et une seconde couche d'enregistrement de données (104), pour lesquelles un même plan d'incidence de lumière est utilisé à des fins de reproduction ou d'enregistrement. La première couche d'enregistrement de données (102) est disposée sensiblement dans une position t par rapport au plan d'incidence de la lumière (106). La seconde couche d'enregistrement de données (104) est disposée sensiblement dans une position t’ par rapport au plan d'incidence de la lumière (106), position qui satisfait la relation t’≤ 0,5t. La capacité d'enregistrement de données de la seconde couche (104) est supérieure à celle de la première couche (102).
PCT/JP2006/300063 2005-01-07 2006-01-06 Disque optique et dispositif de disque optique WO2006073169A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-002092 2005-01-07
JP2005002092A JP2008059618A (ja) 2005-01-07 2005-01-07 ２層光ディスク

Publications (1)

Publication Number Publication Date
WO2006073169A1 true WO2006073169A1 (fr) 2006-07-13

Family

ID=36647645

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/300063 WO2006073169A1 (fr) 2005-01-07 2006-01-06 Disque optique et dispositif de disque optique

Country Status (2)

Country Link
JP (1) JP2008059618A (fr)
WO (1) WO2006073169A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09147415A (ja) * 1995-11-21 1997-06-06 Matsushita Electric Ind Co Ltd 多層ディスク
JP2001056965A (ja) * 1999-08-18 2001-02-27 Sony Corp 記録媒体及び記録媒体の再生装置並びに再生方法
JP2004095005A (ja) * 2002-08-29 2004-03-25 Sharp Corp 光情報記録媒体
JP2004152398A (ja) * 2002-10-30 2004-05-27 Pioneer Electronic Corp 多層情報記録媒体及び多層情報記録媒体記録再生装置
JP2004303351A (ja) * 2003-03-31 2004-10-28 Sanyo Electric Co Ltd テストディスク

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09147415A (ja) * 1995-11-21 1997-06-06 Matsushita Electric Ind Co Ltd 多層ディスク
JP2001056965A (ja) * 1999-08-18 2001-02-27 Sony Corp 記録媒体及び記録媒体の再生装置並びに再生方法
JP2004095005A (ja) * 2002-08-29 2004-03-25 Sharp Corp 光情報記録媒体
JP2004152398A (ja) * 2002-10-30 2004-05-27 Pioneer Electronic Corp 多層情報記録媒体及び多層情報記録媒体記録再生装置
JP2004303351A (ja) * 2003-03-31 2004-10-28 Sanyo Electric Co Ltd テストディスク

Also Published As

Publication number Publication date
JP2008059618A (ja) 2008-03-13

Similar Documents

Publication Publication Date Title
US7477592B2 (en) Optical disc, optical disc apparatus, optical disk reproducing method, and digital work publication
WO2006087836A1 (fr) Disque optique et dispositif de disque optique
US7570566B2 (en) Optical disc, optical disc manufacturing method, and optical disc apparatus
JP2002109775A (ja) 光ピックアップ装置及び対物レンズ
JP2006155830A (ja) 光ディスク及び光ディスク装置及び光ディスク再生方法
JP2010157315A (ja) 非球面レンズ及びそれを対物レンズとして採用した光ピックアップ
US20060120258A1 (en) Optical disc, optical disc apparatus, optical disc reproducing method, and digital content publication
US20060002276A1 (en) Optical disc apparatus
JP2006127714A (ja) 対物光学系及び光ピックアップ装置
JP2004145907A (ja) 光ピックアップ装置、集光光学素子及び補正素子
US7688702B2 (en) Optical disc and optical disc device
JP4400342B2 (ja) 対物レンズ及び光ピックアップ装置
KR20060105233A (ko) 하이브리드 디스크, 그 기록 및/또는 재생 장치 및 방법
WO2010067556A1 (fr) Support d'enregistrement d'informations, dispositif de reproduction et procédé de reproduction
JP4465838B2 (ja) 光ピックアップ装置及び対物レンズ
JP2003016691A (ja) 多層構造の情報媒体およびこの媒体を用いる装置
US20060002277A1 (en) Optical disc apparatus
JP2007521605A (ja) 情報記録媒体、データの記録／再生方法及び記録／再生装置
US20100067336A1 (en) Device and method for reproducing information and computer program
JP2009181614A (ja) 光ディスクおよび光ディスク装置
JP4366813B2 (ja) 光ピックアップ装置及び光ピックアップ装置用のカップリングレンズ
WO2006073169A1 (fr) Disque optique et dispositif de disque optique
JP4228723B2 (ja) 光ピックアップ装置及び光ピックアップ装置用の対物レンズ
JP5563480B2 (ja) 情報記録媒体、再生装置および再生方法
JP2006053994A (ja) 光ピックアップ

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 06702040

Country of ref document: EP

Kind code of ref document: A1

WWW Wipo information: withdrawn in national office

Ref document number: 6702040

Country of ref document: EP