[go: up one dir, main page]

WO2003001512A2 - Dispositif de lecture optique destine a la lecture/ecriture de/sur disques optiques multicouches - Google Patents

Dispositif de lecture optique destine a la lecture/ecriture de/sur disques optiques multicouches Download PDF

Info

Publication number
WO2003001512A2
WO2003001512A2 PCT/US2002/019979 US0219979W WO03001512A2 WO 2003001512 A2 WO2003001512 A2 WO 2003001512A2 US 0219979 W US0219979 W US 0219979W WO 03001512 A2 WO03001512 A2 WO 03001512A2
Authority
WO
WIPO (PCT)
Prior art keywords
optical
reading
piezo
layer
electrostriction
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/US2002/019979
Other languages
English (en)
Other versions
WO2003001512A3 (fr
Inventor
Eugene Levich
Alexander Libin
Anatolii Dovgan
Sergey Milutin
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.)
TriD Store IP LLC
Original Assignee
TriD Store IP LLC
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 TriD Store IP LLC filed Critical TriD Store IP LLC
Priority to JP2003507811A priority Critical patent/JP2005508559A/ja
Priority to AU2002315429A priority patent/AU2002315429A1/en
Priority to EP02742281A priority patent/EP1579429A2/fr
Publication of WO2003001512A2 publication Critical patent/WO2003001512A2/fr
Anticipated expiration legal-status Critical
Publication of WO2003001512A3 publication Critical patent/WO2003001512A3/fr
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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
    • G11B7/13927—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means during transducing, e.g. to correct for variation of the spherical aberration due to disc tilt or irregularities in the cover layer thickness
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
    • 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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers

Definitions

  • the present invention generally related to an optical reading device for writing /reading on/from multi-layer disks utilizing a light beam from a light source and provided with a device for controlling and correction of the wave front of phase shift of light beam which is produced by changing of thickness in the substrate of information layer.
  • the thickness of substrate changes in transition from one informational layer to another during reading and due to technological deviations of substrate at disk fabrication.
  • Magneto-optical and phase optical carriers such as optical and magneto-optical disks, magnetic disks and magnetic tapes are most popular carriers for digital information. Such carriers were used as information carriers for writing/reading by light beam from laser source. Recently, carriers using fluorescent layers for writing/reading of information were suggested in the related art. Thin film is distributed at the surface of a carrier with preliminary created profile forms a recording layer with a strong fluorescent action.
  • Such optical carriers have exceptional optical properties like optical transparency and significant difference in wavelengths of laser write/excitement beam and reading fluorescent beam.
  • Multi-layer fluorescent disk almost transparent for the laser beam allows developing disks with 10 and more layers.
  • the allowable limit for inter-layer gap should be above 30 ⁇ m, which is necessary to keep the required level of cross-noise from different informational layers of the multi-layer disk. Therefore, only 3 layers of high-density record could be obtained without spherical aberration correction.
  • the number of write/read layers on disk could be increased ten times or more by using a module for detection of the substrate thickness of the record layer and phase corrector for the lens spherical aberration. This solution allows a significant increase of the lens aperture, reduces the write/read wavelength and increases information density, and write/read 10 th informational layers on the disk.
  • An additional problem for the high-density carrier is the focusing of the lens with a high numeric aperture.
  • the design problem of an effective focus sensor having minimum cross-noise from neighbor layers is derived from decreasing focus deepness by inverse square of numeric lens aperture, and cross-interaction of neighbor layers on a focus sensor signal. Focusing sensors realizing algorithm of signal generation by phase methods e.g. synchronized detection, but not amplitude methods have certain advantages.
  • Such a sensor construction could be realized with piezo-ceramic optical element that will produce a periodic phase difference for optical irradiation between central and peripheral lens zones with a property producing unfocusing on a carrier of light beam.
  • a single piezo-ceramic element will allow a high-density multi-layer recording on optical carrier and provide an effective defocusing sensor that will not be sensitive to the amplitude cross-noise from the above and lower informational layers.
  • an optical information reader for writing/reading of multi-layer optical disks utilizing light beam from the light source directed to optical carrier by the lens and receiving reflected or fluorescent light.
  • the optical reader includes a device for receiving reflected fluorescent light and a detector of the disk writing/reading layer which determines the required value of compensation or correction of spherical aberration compared to the calculated one.
  • the writing layer detector controls the reflected or fluorescent light signal obtained from information layer of the carrier.
  • the optical reader also includes also a piezo-ceramic optical element located in a light beam that is directed from the light source to the carrier.
  • This piezo-element has a phase difference between central and peripheral zones that depend on sign and value of voltage applied to it.
  • An optical reader can determine a value and sign of optical aberration with high accuracy.
  • the piezo-ceramic element reduces spherical aberrations to the accepted level at any writing layer and at any radial position of spot on record track. In such a way the average value of spherical aberration and its current value mediated by fluctuation of record layer thickness will be reduced.
  • a piezo-ceramic device reduces aberrations by using the phase differences change between its central and peripheral zones as result of current change of record layer thickness.
  • Fig. 1 is an electrostriction device for the spherical aberration correction. Electrodes are shown by numbers 1 ,2 and 3. Radius Ro» ho.
  • Fig. 2 is an electrostriction device for the focus scanning. Electrodes are shown by numbers 1 ,2 and 3. Radius Ro ⁇ ho.
  • Fig. 3 is a combined electrostriction device. Electrodes are shown by numbers 1 ,2,3 and 4.
  • the present invention relates to the optical information reader for writing/reading of multi-layer optical disks utilizing the light beam from the light source directed to optical carrier by the lens and receiving reflected or fluorescent light from the optical carrier.
  • the present invention comprises an optical reading device for reading, correction of spherical aberration and focusing that can maintains a minimum spherical aberration and a high accuracy lens focusing with high aperture during reading of multi-layer optical high-density disks.
  • the optical reading device includes information reading means illuminating an optical disk with irradiated light beam via an objective lens and detecting a light reflected from the optical disk to read information, thickness record layer and defocusing detector, and an electrostriction device located in the path of a light beam passing from the light source and secured to the lens on moving part of the lens moving device for producing a phase difference between the central and peripheral parts when voltage is applied thereto.
  • the present invention also comprises a device for controlling the lens spherical aberration invoked by deviation of informational layer thickness in comparison with calculation rating of the given lens.
  • a device for controlling the lens spherical aberration invoked by deviation of informational layer thickness in comparison with calculation rating of the given lens are described US Patent No. 5513153 containing titanium or tin oxide and divided into central and peripheral compartments.
  • the electrostriction devices in the '153 patent are incorporated herein in their entirety.
  • Transparent electrodes are introduced in such medium.
  • Light beam phase difference providing the lens focal point move or the convergence of light beams in the lens focus could be obtained by application of differential voltage to central and peripheral parts of the electrodes.
  • Additional high frequency 'scanning' or phase difference formation for electrostriction device can be utilized for the detection of spherical aberration and focusing.
  • ⁇ cf ⁇ r 4 + ⁇ 2 r 6 + ⁇ 3 r 8
  • 2-coordinate actuator reducing the focusing error is sing as lens device control in focus direction.
  • Electrostriction device used for the beam dephasing by formulas (1) or (2) can work as spherical aberration control device. It is necessary to reside the electrode system in such a way that phase gradient was achieving a necessary value.
  • the dephasing at the spherical aberration correction will be up to 2-3 ⁇ in the range 0-100 Hz because of an electrostriction element is an executive mechanism if the phase difference due to base focusing signals less then O.l ⁇ at frequencies more 10 KHz.
  • One central and one peripheral electrode is enough for the support of defocusing phase difference. At least 2 peripheral electrodes are necessary for spherical aberration phase difference to maintain bend of the function of phase difference at the maximum (minimum), which is not necessary for the defocusing phase difference.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

La présente invention concerne un lecteur d'information optique destiné à écrire/lire des/sur des disques optiques multicouches au moyen d'un faisceau lumineux issu d'une source lumineuse dirigée sur le support optique par la lentille et recevant la lumière reflétée ou fluorescente. Un lecteur optique comprend le dispositif de réception de la lumière reflétée ou fluorescente et le détecteur de la couche d'écriture/de lecture du disque dans le but de déterminer une valeur de compensation ou de correction d'aberration sphérique requise comparée à la valeur calculée. Le détecteur de couche d'écriture commande le signal lumineux reflété ou fluorescent obtenu de la couche d'information du support. Le lecteur optique comprend aussi un élément optique piézo-électrique situé dans un faisceau lumineux dirigé à partir d'une source lumineuse sur le support. Ce piézo-élément possède une différence de phase entre des zones centrale et périphérique qui dépendent de signe et de valeur de tension appliquée sur celles-ci. Un lecteur optique peut déterminer une valeur et un signe d'aberration optique avec une haute précision. Un élément piézo-céramique réduit une aberration sphérique au niveau accepté de n'importe quelle couche d'écriture et de n'importe quelle position radiale de point situé sur la piste d'enregistrement. De cette manière, la valeur moyenne d'aberration sphérique et sa valeur courante induite par la fluctuation de l'épaisseur de la couche d'enregistrement sera réduite. Un dispositif piézo-céramique réduit les aberrations en utilisant les changements de différences de phase entre ses zones centrale et périphérique, résultat du changement courant de l'épaisseur de couche d'enregistrement.
PCT/US2002/019979 2001-06-25 2002-06-25 Dispositif de lecture optique destine a la lecture/ecriture de/sur disques optiques multicouches Ceased WO2003001512A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2003507811A JP2005508559A (ja) 2001-06-25 2002-06-25 多層光ディスクへの書き込み／多層光ディスクからの読み取りのための光読み取り装置
AU2002315429A AU2002315429A1 (en) 2001-06-25 2002-06-25 Optical reading device for writing/reading on/from multi-layer optical disks
EP02742281A EP1579429A2 (fr) 2001-06-25 2002-06-25 Dispositif de lecture optique destine a la lecture/ecriture de/sur disques optiques multicouches

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US30005501P 2001-06-25 2001-06-25
US60/300,055 2001-06-25

Publications (2)

Publication Number Publication Date
WO2003001512A2 true WO2003001512A2 (fr) 2003-01-03
WO2003001512A3 WO2003001512A3 (fr) 2008-10-23

Family

ID=23157510

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/019979 Ceased WO2003001512A2 (fr) 2001-06-25 2002-06-25 Dispositif de lecture optique destine a la lecture/ecriture de/sur disques optiques multicouches

Country Status (5)

Country Link
EP (1) EP1579429A2 (fr)
JP (1) JP2005508559A (fr)
CN (1) CN101366085A (fr)
AU (1) AU2002315429A1 (fr)
WO (1) WO2003001512A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9275671B2 (en) 2011-06-09 2016-03-01 Case Western Reserve University Optical information storage medium

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5835458A (en) * 1994-09-09 1998-11-10 Gemfire Corporation Solid state optical data reader using an electric field for routing control
US6044056A (en) * 1996-07-30 2000-03-28 Seagate Technology, Inc. Flying optical head with dynamic mirror
US6246650B1 (en) * 1996-12-18 2001-06-12 Sony Corporation Method and apparatus for high speed data reproduction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9275671B2 (en) 2011-06-09 2016-03-01 Case Western Reserve University Optical information storage medium

Also Published As

Publication number Publication date
CN101366085A (zh) 2009-02-11
JP2005508559A (ja) 2005-03-31
WO2003001512A3 (fr) 2008-10-23
AU2002315429A8 (en) 2008-11-20
AU2002315429A1 (en) 2003-01-08
EP1579429A2 (fr) 2005-09-28

Similar Documents

Publication Publication Date Title
US5936923A (en) Optical pickup with aberration correcting panel including a liquid crystal
US7558162B2 (en) Optical pick-up head, optical information apparatus, and optical information reproducing method
US5515348A (en) Optical disk pickup device with tilt compensation by electrostriction
JP3110532B2 (ja) 光学式情報書込、読取及び／又は消去する方法並びにその装置
US5963532A (en) Polarization rotation and phase compensation in near-field electro-optical system
US7639588B2 (en) Optical disc drive apparatus
CN1329893C (zh) 光记录介质操纵装置及其焦点控制方法
EP1560209B1 (fr) Element optique a cristaux liquides et dispositif optique
KR101143028B1 (ko) 다층 광학 정보 기록 매체
KR100385381B1 (ko) 광 기록 캐리어
JPH06295467A (ja) 光ピックアップ装置
EP1579429A2 (fr) Dispositif de lecture optique destine a la lecture/ecriture de/sur disques optiques multicouches
JP4026248B2 (ja) 光ディスク装置
JP2003263770A (ja) 光記録再生装置及び光記録媒体
US8023368B2 (en) Tilt sensor and optical disk drive
JP3208910B2 (ja) ディスク傾き補正装置
US8400899B2 (en) Optical pickup device with detection optical system
JP4186857B2 (ja) 光情報記録及び／または再生装置及びその焦点制御方法
US20080253262A1 (en) Multi Layer Variable Refractive Index Unit
JPH02173942A (ja) 光検出装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2003507811

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 1020037016938

Country of ref document: KR

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 16/KOLNP/2004

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 2002742281

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 20028161602

Country of ref document: CN

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWP Wipo information: published in national office

Ref document number: 2002742281

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 2002742281

Country of ref document: EP