WO2011069809A1 - Procédé et appareil permettant de lire et/ou d'écrire des données sur un support d'enregistrement optique - Google Patents

Procédé et appareil permettant de lire et/ou d'écrire des données sur un support d'enregistrement optique Download PDF

Info

Publication number
WO2011069809A1
WO2011069809A1 PCT/EP2010/067839 EP2010067839W WO2011069809A1 WO 2011069809 A1 WO2011069809 A1 WO 2011069809A1 EP 2010067839 W EP2010067839 W EP 2010067839W WO 2011069809 A1 WO2011069809 A1 WO 2011069809A1
Authority
WO
WIPO (PCT)
Prior art keywords
wavelength
light beam
marks
recording medium
optical recording
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2010/067839
Other languages
English (en)
Inventor
Gael Pilard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomson Licensing SAS
Original Assignee
Thomson Licensing SAS
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 Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP10777040.6A priority Critical patent/EP2510518B1/fr
Priority to US13/514,278 priority patent/US8462604B2/en
Publication of WO2011069809A1 publication Critical patent/WO2011069809A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • G11B7/004—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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording

Definitions

  • the present invention relates to a method and an apparatus for reading from and/or writing to an optical recording medium, and more specifically to a method and an apparatus for reading from and/or writing to an optical recording medium with a Super-RENS structure .
  • Numerous types of optical storage media and corresponding storage systems are known.
  • JP 2007-48404 discloses an optical recording medium, which includes a first recording layer (a BD-layer, BluRay Disc) capable of recording/reading with a first wavelength of a first laser beam and a second recording layer (a DVD-layer, Digital Versatile Disc) capable of recording/reading with a second wavelength of a second laser beam.
  • US 2006/0104172 discloses an optical recording medium, which has a CD format (Compact Disc) , but which includes a test region with DVD-formatted marks.
  • the optical recording medium is read at a CD wavelength, whereas the test region is read at a DVD wavelength .
  • US 2007/0247997 describes a hybrid DVD/CD optical recording medium and a hybrid BD/CD optical recording medium, which are recorded by simultaneously illuminating two light beams with different wavelengths. This is done to increase the irradiated amount of energy.
  • US 2008/0279082 discloses a multi-layer optical recording medium. The different layers are read with different
  • a playback device for this optical recording medium includes a multi-wavelength light source, which is used for simultaneously illuminating all recording layers. The reflected light is split in accordance with the wavelength, which allows to retrieve the data recoded in the different layers.
  • Optical data storage is generally limited by the optical resolution of the read/write-system.
  • Straightforward methods of increasing the optical resolution include using a shorter wavelength and a larger numerical aperture NA, at the costs of lens complexity.
  • a mask layer with a so-called super-resolution near field structure can be placed directly above a data layer of the optical recording medium, which significantly reduces the effective size of a light spot used for reading from and/or writing to the optical recording medium.
  • Optical recording media with such a Super-RENS structure offer the possibility to increase the data density by a factor of 3 to 4 in one dimension compared to a regular optical recording medium.
  • Today mainly two types of mask layers are used.
  • the first type is a phase change type, which makes use of materials like AglnSbTe (also known as AIST) , GeSbTe (also known as GST) or SbTe .
  • the second type is a semiconductor type, for example InSb, or any other material which induces an appreciable
  • Super-RENS structures formed of a metal oxide or a polymer compound for recording of data and a phase change layer formed of a GeSbTe or a AglnSbTe based structure for reproducing of data are known from WO 2005/081242 and US 2004/0257968, respectively.
  • a further example of a super-RENS structure is described in WO 2004/032123.
  • this object is also achieved by a method for writing data to an optical recording medium as marks having different lengths, which has the steps of:
  • this object is achieved by an apparatus for reading from an optical recording medium on which data are stored as marks having different lengths, with a first light source for generating a light beam of a first wavelength and a second light source for generating a light beam of a second wavelength larger than the first
  • this object is achieved by an apparatus for writing data to an optical recording medium as marks having different lengths, with a first light source for generating a light beam of a first wavelength and a second light source for generating a light beam of a second wavelength larger than the first
  • wavelength which is adapted to write the marks having a length below the limit of diffraction at the first wavelength with the light beam of the first wavelength and to write the marks having a length above the limit of diffraction at the first wavelength with the light beam of the second wavelength.
  • a main idea of the present invention is to use at least two different laser wavelengths for reading and/or writing marks. This allows to read and/or write all marks in the super- resolution regime. Consequently, the range of available of mark lengths is increased.
  • the mark length for changing from the first wavelength to the second wavelength is defined by the limit of diffraction at the first wavelength. During writing the short marks are written using the shorter wavelength, whereas the longer marks are written using the longer wavelength.
  • a further alternative is to 'prepare' the recording material with a constant power delivered by the second light source at the longer wavelength and to write the marks using additional pulses delivered by the first light source at the shorter wavelength.
  • the first wavelength is around 405nm
  • the second wavelength is around 780nm.
  • inexpensive and reliable light sources are available, as well as the necessary optical components.
  • LD 238.23nm for the smallest detectable structure. As this structure consists of a mark plus a space, the largest mark length below the limit of diffraction is roughly 120nm.
  • the predetermined length for changing from the first wavelength to the second wavelength is around 120nm.
  • the light beam with the second wavelength is a first wavelength
  • the light beam of the first wavelength and the light beam of the second wavelength are illuminated onto different locations of the optical recording medium. This allows to provide fully separate signal paths for the different light beams. However, during reading the resulting time shift of the detector signals needs to be taken into account by an evaluation circuitry .
  • the first reflected light beam and the second reflected light beam are detected with a single detector. This allows to simplify the detection path, as it is not necessary to separate the different reading wavelengths. Consequently, the cost of the detection path is reduced.
  • one of the light sources is high frequency modulated to enable a reliable signal separation.
  • Fig. 1 illustrates a spectrum of an AIST-based super- RENS optical recording medium
  • Fig. 2 shows results of CNR and jitter measurements in dependence of the read power
  • Fig. 3 depicts an apparatus according to the invention for reading from and/or writing to a Super-RENS optical recording medium
  • Fig. 4 shows the arrangement of a first and a second
  • Fig. 5 depicts a series of tracks on a Super-RENS
  • Fig. 1 illustrates a spectrum of an AIST-based super-RENS optical recording medium. Plotted is the amplitude of the detected signal in dB against the frequency of the marks in MHz, i.e. against the reciprocal of the length of one mark plus one space multiplied by the reading speed, which in this example is 4.92m/s. As can be seen, there is a dip (indicated by the arrow) in the spectrum between the regime of diffractive detection on the left side and the regime of super-resolution detection on the right side. This dip results from the conflict between super-resolution detection and diffractive detection and
  • Fig. 2 shows the results of those measurements.
  • the continuous line represents the CNR in dB against the read power of a reading light beam in mW for a mark length of 80nm.
  • the dashed line represents the measured jitter in % against the read power in mW determined for the longer marks, i.e. in the regime of diffractive detection.
  • satisfactory CNR values in the super-resolution detection regime are achieved with a read power above 2.25mW.
  • such a read power results in a poor signal in the regime of diffractive detection, as the jitter assumes very large values.
  • Fig. 3 depicts an apparatus 1 according to the invention for reading from and/or writing to a Super-RENS optical recording medium 13, which overcomes the above described problems.
  • a first laser diode 2 emits a polarized reading light beam 3 at a first wavelength, e.g. at 405nm, which is collimated by a first collimator lens 4.
  • a second laser diode 6 emits a polarized reading light beam 7 at a second wavelength, e.g. at 780nm, which is collimated by a second collimator lens 8. Both laser diodes 2, 6 are used for super-resolution detection. Therefore, they both need to operate in a power-range that enables super- resolution mechanisms.
  • the two collimated light beams 3, 7 are combined by a first dichroic beam splitter 5 and pass through a polarizing beam splitter 9.
  • a subsequent quarter wave plate 10 transforms the two light beams 3, 7 into circular polarized light beams 3, 7, which then pass through a telescope 11 consisting of two lenses 11a, lib.
  • An objective lens 12 focuses the two light beams 3, 7 onto the optical recording medium 13. A certain amount of chromatic aberration will generally be
  • the light beams 15, 18 reflected by the optical recording medium 13 are collimated by the objective lens 12 and pass through the quarter wave plate 10, which transforms the reflected light beams 15, 18 into linear polarized light beams 15, 18. Due to the quarter wave plate 10 the direction of polarization of the reflected light beams 15, 19 is perpendicular to the direction of polarization of the initial light beams 3, 7.
  • the reflected light beams 15, 18 are thus deflected by the polarization beam splitter 9 towards a second dichroic beam splitter 14, which separates the optical paths of the two reflected light beams 15, 18.
  • the first reflected light beam 15 is focused by a first focusing lens 16 onto a first photodetector 17.
  • the first photodetector 17 has four detector quadrants.
  • reflected light beam 18 is focused by a second focusing lens 19 onto a second photodetector 20 which in this example also has four detector quadrants.
  • An evaluation circuitry (21) evaluates the signals obtained by the photodetectors 17, 20 to obtain focus and tracking signals as well as a data signal.
  • a dichroic beam splitter 14 is used for separating the optical paths.
  • other components e.g. a grating or a prism.
  • one of the laser diodes 2, 6 is preferably high frequency modulated to enable a reliable signal separation.
  • Fig. 3 the two light beams 3, 7 are focused onto the same position of the optical recording medium 13.
  • both light beams 3, 7 slightly displaced in a track direction of the optical recording medium 13.
  • Fig. 14 the evaluation circuitry needs to take the resulting time shift of the detector signals into account.
  • Fig. 5 A series of tracks 131 on a Super-RENS optical recording medium 13, in which data are recorded as marks 132, is depicted in Fig. 5. Illustrated is only a small section of the surface of the optical recording medium 13.
  • the tracks 131 are either arranged as concentric tracks or as a track spiral.
  • the tracks 132 are preferably parallel tracks.
  • data are coded using marks 132 with different lengths. Some marks 132 have a length larger than the limit of diffraction of the shorter wavelength. These marks 132 are illustrated as hashed marks. They are detected using the longer wavelength.
  • a main idea of the present invention is to use at least two different reading and/or writing wavelengths to implement an increased range of marks lengths while reading all marks in the super-resolution regime.
  • the limit of diffraction is given by the formula
  • LD X/ (2*NA) , where LD is the limit of diffraction, ⁇ is the wavelength used for detection, and NA denotes the numerical aperture of the objective lens 12.
  • NA the numerical aperture of the objective lens 12.
  • Data detection with the above described apparatus 1 is performed as follows.
  • the smallest marks, which are below the limit of diffraction of the shorter wavelength, i.e. whose size is below 120nm, are detected using this wavelength.
  • the larger marks, which are in a range comprised between the limit of diffraction of the two wavelengths, i.e. whose size is between 120nm and 230nm, are detected using the longer wavelength.
  • the simultaneous detection using two wavelengths offers some advantageous possibilities for the signal analysis.
  • the signals from the different wavelengths may be coupled in order to enhance the detection or to recover or find errors.
  • the diffractive readout signal stemming from the detection of the longer marks with the shorter wavelength may be removed using the fact that their amplitude is higher and/or that their frequency is lower.
  • all marks may be written using the shorter wavelength.
  • the short marks are written using the shorter wavelength, whereas the longer marks are written using the longer wavelength.
  • a further alternative is to 'prepare' the recording material with a constant power delivered by the second laser diode 6 at the longer wavelength and to write the marks using additional pulses delivered by the first laser diode 2 at the shorter wavelength.
  • the proposed wavelengths allow to easily build an RLL(1,9) coding similar to the one used for the BluRay disk format.
  • T clock length
  • a slight defocus of the light beam 7 with the longer wavelength is preferably used to compensate the chromatic aberration introduced by the
  • the focal depth ⁇ of a light beam is given by

Landscapes

  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

La présente invention se rapporte à un procédé et un appareil (1) qui permettent de lire et/ou d'écrire des données sur un support d'enregistrement optique (13), ces données étant stockées sous la forme de marques (132) ayant des longueurs différentes. Les marques (132) dont la longueur est inférieure à la limite de diffraction à une première longueur d'onde sont lues ou écrites avec la première longueur d'onde, tandis que les marques (132) dont la longueur est supérieure à la limite de diffraction à la première longueur d'onde sont lues ou écrites avec une seconde longueur d'onde supérieure à la première.
PCT/EP2010/067839 2009-12-07 2010-11-19 Procédé et appareil permettant de lire et/ou d'écrire des données sur un support d'enregistrement optique Ceased WO2011069809A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10777040.6A EP2510518B1 (fr) 2009-12-07 2010-11-19 Procédé et appareil pour la lecture et/ou l'écriture d'un support d'enregistrement optique
US13/514,278 US8462604B2 (en) 2009-12-07 2010-11-19 Method and apparatus for reading from and/or writing to an optical recording medium

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09306188A EP2333772A1 (fr) 2009-12-07 2009-12-07 Procédé et appareil pour la lecture et/ou l'écriture d'un support d'enregistrement optique
EP09306188.5 2009-12-07

Publications (1)

Publication Number Publication Date
WO2011069809A1 true WO2011069809A1 (fr) 2011-06-16

Family

ID=41720636

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/067839 Ceased WO2011069809A1 (fr) 2009-12-07 2010-11-19 Procédé et appareil permettant de lire et/ou d'écrire des données sur un support d'enregistrement optique

Country Status (3)

Country Link
US (1) US8462604B2 (fr)
EP (2) EP2333772A1 (fr)
WO (1) WO2011069809A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372365A2 (fr) * 1988-12-09 1990-06-13 Sharp Kabushiki Kaisha Appareil de lecture optique
US5526338A (en) * 1995-03-10 1996-06-11 Yeda Research & Development Co. Ltd. Method and apparatus for storage and retrieval with multilayer optical disks
WO2004032123A1 (fr) 2002-10-04 2004-04-15 Koninklijke Philips Electronics N.V. Support mo-rom presentant une super resolution et une densite des pistes elevee
US20040257968A1 (en) 2003-06-23 2004-12-23 Samsung Electronics Co., Ltd. Optical disc with super-resolution near-field structure
WO2005081242A1 (fr) 2004-02-25 2005-09-01 Samsung Electronics Co., Ltd. Support de stockage d'information a resolution elevee, procede de realisation de signal de reproduction stable, et appareil pour l'enregistrement/la reproduction sur/depuis le support de stockage d'information
US20060104172A1 (en) 2004-11-12 2006-05-18 Grampel Hendrik T V Authenticatable media and method of authenticating
JP2007048404A (ja) 2005-08-12 2007-02-22 Pioneer Electronic Corp 情報記録媒体、情報処理装置及び方法、並びに、記録又は再生を行う処理制御用のコンピュータプログラム
US20070247997A1 (en) 2004-08-20 2007-10-25 Pioneer Corporation Optical Pickup Device, and Information Recording and Reproduction Device
US20080279082A1 (en) 2007-05-04 2008-11-13 Lg Electronics Inc. Optical pickup, recording/reproducing apparatus and recording/reproducing method

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1158509A3 (fr) * 1993-04-02 2002-01-02 Canon Kabushiki Kaisha Procédé d'enregistrement magnéto-optique
US5537382A (en) * 1994-11-22 1996-07-16 Optex Corporation Partial response coding for a multi-level optical recording channel
JP3366973B2 (ja) * 1996-10-18 2003-01-14 富士通株式会社 光記録媒体の情報記録方法
JPWO2007029430A1 (ja) * 2005-09-05 2009-03-12 日本電気株式会社 光学情報再生方法、光学情報再生装置及び光学情報記録媒体
JP4835096B2 (ja) * 2005-10-07 2011-12-14 Ｔｄｋ株式会社 超解像光記録媒体及び超解像光記録媒体への情報記録方法
JP2009517794A (ja) * 2005-11-28 2009-04-30 メンパイル インク 多層３次元非線形光データキャリア及びこの媒体におけるデータ記録／読み出し方法
JP2007220264A (ja) * 2006-02-20 2007-08-30 Tdk Corp 超界像光記録媒体への情報記録方法及び情報記録装置
CN101853672B (zh) * 2007-10-19 2015-02-25 夏普株式会社 光信息记录介质重放装置及其控制方法
KR100965890B1 (ko) * 2008-07-14 2010-06-24 삼성전자주식회사 홀로그래픽 정보 기록/재생 장치 및 방법
JP2010218608A (ja) * 2009-03-16 2010-09-30 Hitachi Ltd 光情報記録再生方法及び装置及び媒体

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372365A2 (fr) * 1988-12-09 1990-06-13 Sharp Kabushiki Kaisha Appareil de lecture optique
US5526338A (en) * 1995-03-10 1996-06-11 Yeda Research & Development Co. Ltd. Method and apparatus for storage and retrieval with multilayer optical disks
WO2004032123A1 (fr) 2002-10-04 2004-04-15 Koninklijke Philips Electronics N.V. Support mo-rom presentant une super resolution et une densite des pistes elevee
US20040257968A1 (en) 2003-06-23 2004-12-23 Samsung Electronics Co., Ltd. Optical disc with super-resolution near-field structure
WO2005081242A1 (fr) 2004-02-25 2005-09-01 Samsung Electronics Co., Ltd. Support de stockage d'information a resolution elevee, procede de realisation de signal de reproduction stable, et appareil pour l'enregistrement/la reproduction sur/depuis le support de stockage d'information
US20070247997A1 (en) 2004-08-20 2007-10-25 Pioneer Corporation Optical Pickup Device, and Information Recording and Reproduction Device
US20060104172A1 (en) 2004-11-12 2006-05-18 Grampel Hendrik T V Authenticatable media and method of authenticating
JP2007048404A (ja) 2005-08-12 2007-02-22 Pioneer Electronic Corp 情報記録媒体、情報処理装置及び方法、並びに、記録又は再生を行う処理制御用のコンピュータプログラム
US20080279082A1 (en) 2007-05-04 2008-11-13 Lg Electronics Inc. Optical pickup, recording/reproducing apparatus and recording/reproducing method

Also Published As

Publication number Publication date
EP2510518A1 (fr) 2012-10-17
EP2333772A1 (fr) 2011-06-15
US20120250486A1 (en) 2012-10-04
US8462604B2 (en) 2013-06-11
EP2510518B1 (fr) 2013-09-25

Similar Documents

Publication Publication Date Title
KR100542173B1 (ko) 초점 조정 방법 및 광픽업 장치
JP4380438B2 (ja) 光ディスク装置
KR100557542B1 (ko) 트래킹 에러 오프셋 보상용 광검출 영역이 형성된 광픽업장치
EP2510518B1 (fr) Procédé et appareil pour la lecture et/ou l'écriture d'un support d'enregistrement optique
KR100750104B1 (ko) 단일 광원을 채용한 호환형 광픽업장치
KR101187710B1 (ko) 광픽업 장치
KR100600297B1 (ko) 트랙 피치가 상이한 광디스크용 광픽업 장치
KR101189125B1 (ko) 광 픽업
US20060262708A1 (en) Optical head unit and optical disc apparatus
US20070064573A1 (en) Optical head unit and optical disc apparatus
KR100214581B1 (ko) 광픽업장치
KR100600587B1 (ko) 광픽업 장치
US7965609B2 (en) Optical pickup device and optical recording medium information reproduction device
JP4345799B2 (ja) 光ディスク
US8228776B2 (en) Apparatus with a pickup for reading data from or writing data to an optical storage medium
EP2172934A1 (fr) Support de stockage optique comprenant des marques d'orientation différente et appareil correspondant pour la lecture de données
JP2006244536A (ja) 光ヘッド装置および光ディスク装置
KR20070008277A (ko) 이종 광디스크용 광픽업장치
KR20030071069A (ko) 광 픽업 장치
JP2007122805A (ja) 光ヘッド装置及び光ディスク装置
KR20020065156A (ko) 광픽업 장치에 있어서의 틸트검출 방법
JPH10214436A (ja) 光ピックアップ装置
KR20030071070A (ko) 광픽업 검출기 구조
KR20070060602A (ko) 광 픽업 장치
KR20110018176A (ko) 광픽업장치 및 광픽업장치의 트래킹 에러 생성 방법

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10777040

Country of ref document: EP

Kind code of ref document: A1

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10777040

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2010777040

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 13514278

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE