WO2002011050A2 - Procédé de lecture/écriture de données avec utilisation d'un support optique porteur de configurations d'alvéoles d'information - Google Patents

Procédé de lecture/écriture de données avec utilisation d'un support optique porteur de configurations d'alvéoles d'information Download PDF

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Publication number
WO2002011050A2
WO2002011050A2 PCT/US2001/023931 US0123931W WO0211050A2 WO 2002011050 A2 WO2002011050 A2 WO 2002011050A2 US 0123931 W US0123931 W US 0123931W WO 0211050 A2 WO0211050 A2 WO 0211050A2
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WIPO (PCT)
Prior art keywords
information
optical
data
reading
pit
Prior art date
Application number
PCT/US2001/023931
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English (en)
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WO2002011050A3 (fr
Inventor
Eugene Levich
Sergei Magnitskii
Nikolay Magnitskii
Andrey Mihailov
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
Priority claimed from US09/780,620 external-priority patent/US6507545B2/en
Application filed by Trid Store Ip Llc filed Critical Trid Store Ip Llc
Priority to AU2001284682A priority Critical patent/AU2001284682A1/en
Publication of WO2002011050A2 publication Critical patent/WO2002011050A2/fr
Publication of WO2002011050A3 publication Critical patent/WO2002011050A3/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • 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
    • G11B7/14—Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously
    • 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
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits
    • G11B7/24088—Pits for storing more than two values, i.e. multi-valued recording for data or prepits
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B2020/1249—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the bits are arranged on a two-dimensional hexagonal lattice

Definitions

  • the invention relates to optical memory systems and more particularly to methods of 2D spatial encoding of information for high-density writing in one- or multilayer optical, especially fluorescent data storage systems.
  • the available optical memory systems utilize 2D carriers, generally with one or two information layers.
  • Most of the prior art in the field of optical information recording are based on generating changes in the intensity of reflected laser radiation in local microregions (pits) of the information layer. These changes contain stored information and can result from interference effects on a microrelief surface of optical discs of a CD- Read-Only-Memory (ROM)-type, burning of holes in the metal film, dye bleaching, local melting of dye-containing polymers in widely used CD-Write-Once-Read-Many (WORM) systems, change in reflection coefficient in phase-change CD-Rewritable (RW) systems, etc.
  • ROM Read-Only-Memory
  • WORM local melting of dye-containing polymers
  • RW phase-change CD-Rewritable
  • Figure 1 schematically presents geometry of two-dimensional spatial distribution of information pits on the surface of CD and DVD optical information carriers.
  • Their spatial distribution in CD- and DVD-ROM can be characterized by such parameters as typical pit sizes (shortest pit length 1 , width w, depth d, and track pitch p) and channel bit length.
  • EFM Eight-fourteen modulation
  • Each channel bit corresponds to 1/3 of the minimum mark length.
  • the physical bit density equals to l/(track pitch x channel bit length x 17/8).
  • Table 1 transfer to the DVD-format considerably increases the density and consequently the volume of stored information.
  • information pits occupy yet only part of the information layer area which significantly reduces the values of density and volume of stored informatjon as compared to maximum permissible magnitudes.
  • Such reading/writing mode allows local recording of data as marks (pits) 3D analogous to information pits in conventional CD- or DVD-ROM, with varied optical properties in the volume of information medium.
  • each information layer of the multilayer optical data carrier must have a partially reflecting coat. This attenuates the intensity of both reading and reflecting, information-carrying, beams as a result of direct and reverse motion through the carrier up to a specified information carrying layer and back to the photoreceiver.
  • both beams are coherent, they are prone to difficult-to- read diffraction and interference distortions on pits and grooves of the information carrying layers occurring on their way.
  • multilayer optical information carriers with fluorescent reading that need no partially reflecting coats.
  • Said information carriers ensure considerably reduced diffraction and interference distortions due to the noncoherence of fluorescent radiation, longer wavelength thereof in contrast to reading laser radiation as well as transparence and homogeneity (identity of refraction indices for some layers) of the optical medium with respect to the incident laser and fluorescent radiations. Consequently, multilayer fluorescent optical information carriers have advantages over reflecting ones.
  • fluorescent reading enables a higher signal-to-noise ratio as compared to the absorption method.
  • the subject of the present invention is a new ETT ("eight-to-ten") method of two- dimensional spatial encoding of information stored in two- or three-dimensional, in particular fluorescent optical carriers.
  • the method specifically ensures the same writing density as DVD carriers with EFM ("eight-fourteen modulation") modulation code (see Table 1) but for a 0.8 x 0.4 ⁇ m information pit (fluorescent mark), i.e. as in CD i data carriers.
  • the larger - as compared to the DVD format - pit size enables a simpler technology for manufacturing fluorescent multilayer carriers, for instance of ROM type, and a stronger fluorescent signal in reading.
  • the high writing density is ensured through virtually 100% filling of the information layer area with fluorescent marks in a gap-free manner.
  • the proposed method allows application of the parallel
  • the proposed ETT method of two-dimensional encoding in fluorescent carriers enables a significantly lower magnitude of reading error probability in contrast to existing optical information carriers of DVD-type.
  • the proposed method is also applicable to other one- and multilayer optical data carriers based on various physical and chemical principles of forming information pits,
  • Said method is applicable to various forms of optical memory, for example, as an optical disc, optical memory card, optical memory tape or drum (cylinder), etc.
  • the subject of the invention is writing of one information byte in a field (mic ⁇ oregion) consisting of ten (2 x 5) square elements ("(2 x 5)-field") of specific size in which each said square element contains or does not contain any changes (different from those layer regions that do not carry information) in optical properties (absorption and reflection factors, refraction index, birefringence factor, etc.) testifying either presence
  • Another subject of the invention is a representation of all 256 combinations composing an information byte on the information layer plane by "(2 x 5)-fields" of o two types wherein the first 222 combinations are represented by fields in which each information-carrying square element (pit) has inside a "(2 x 5)-f ⁇ eld” at least one identical adjacent element positioned transversely or lengthwise while each square element comprising no information pit has inside the field identical adjacent element (parity condition).
  • the method can be also utilized for three-dimensional volumetric data encoding as volumetric bytes recorded within a specified microvolume using the two-photon procedure, each said byte consisting of N number of cubic elements of certain size. Data can be read by either one- or two-photon procedure.
  • a further subject of tiie invention is the use for wriiing C&D information of the remaining 52 combinations each represented by one of two complementary "(2 x 5)-iields", wherein the parity condition can be violated only for the top left or bottom left square element of the field consisting of (2 x 5) square elements.
  • the subject of this invention is the selection while writing from the pair of "(2 x 5)-llelds 1 of such a "(2 x 5)-field" thai when joined to the left field thereof enables meeting the parity condition inside each lengthwise strip consisting of joined to one another fields (bytes).
  • the minimal regions of the information layer containing any changes (distinct from the layer regions containing no information) in optical (for example, fluorescent) properties> are composed of two adjacent square elements with varied optical (for example, fluorescent) properties (i.e. information pits (or fluorescent marks)) and consequently measure a x 2a.
  • the layer's minimal regions free of information pits have the same size.
  • One more subject of the present invention is a possibility of gap-free filling of virtually entire area of the data-carrying layer with the proposed ETT-coded information pits.
  • the invention concerns parallel data reading from an optical carrier with the ETT code by means of one- or two-dimensional photodetector array, for instance CCD cameras, enabling mutual longitudinal (and transverse, if necessary) motion relative to each other at a rate timed with both the size of the channel bit and the frame operating rate of the photodetector (CCD camera) array.
  • CCD camera photodetector
  • the square element with a higher signal level is identified as an information pit, while the other element, accordingly, is not considered an information pit.
  • the Ii and It magnitudes are preset by the technical parameters of both the information-carrying medium and the optical reading device.
  • Another subject of the invention is an optical memory system of ROM type based on a m ultilayer fluorescent optical card and pa rallel data reader switching on reading radiation with a wavelength such that it excites fluorescence of the information pits, a dichroic mirror transmitting reading and reflecting fluorescent (information-carrying) radiation, an optical system shaping requisite spatial configuration of the reading beam in the location of a given information layer and fluorescent image thereof in the plane of the linear photodetector array (the linear array of 10 CCD cameras).
  • the optical card has 10 information layers of size 10 cm x 10 cm, each of approximately 6 GB in capacity (or 60 GB in a card).
  • Each layer consists of 250 information strips 400 ⁇ m wide and is provided with C&D ( «control and display») information tracks allowing timing and autotracking of the linear CCD array as it moves across ana along me optical card.
  • Each ol the CCD cameras has 1UUU x 1UUU pixels of size 8 ⁇ rn and is capable of comparing a signal from each pixel with two levels, and signals from adjacent pixels between themselves.
  • the linear CCD array operates in the data pit-to-CCD pixel mode (at 20-fold magnification of the camera) at the rate of 30 frames per second, the whole linear array can read information at 3-10 8 pit/s, which in compliance with the ETT- code makes 30-10 6 B/s or approximately 220 Mb/s. In this case the rate of the linear CCD array is about 12 mm/s, which is almost 100 times slower than onetime data reading from a CD ROM optical disc.
  • Fig. I schematically illustrates the geometry of two-dimensional spatial distribution of information pits on the surface of a CD or DVD optical information carrier
  • Fig. 2 schematically illustrates the geometric configuration of four adjacent information bytes recorded by means of a fluorescent substance using the ETT code
  • Figs. 31 to 37 are a binary-ETT code conversion tables
  • Fig. 4 is a schematic presentation of an embodiment of the optical pickup for parallel reading of information generated by the ETT method of two- dimensional spatial encoding in a fluorescent multilayer optical card
  • Fig. 5 is a schematic presentation of optical communication among elements of the information layers of the optical card and the CCD-camera array
  • Fig. 6 schematically illustrates the movements of the CCD-camera array and the fluorescent optical card relative to each other
  • Fig. 8 is a computer image of that same fragment of the fluorescent card generated by the reading optical system in the plane of the CCD-camera array;
  • Fig. 9 is a picture of that same fragment of the fluorescent card that has been read by a CCD camera.
  • Fig. 2 is a schematic illustration of the geometry of two-dimensional spatial distribution of information pits as four adjacent bytes 20, which are ETT-coded on the surface of, for example, fluorescent data carrier.
  • one data byte is written in field (microregion) 21 consisting often (2 x 5) square elements (hereinafter conventionally called as a "(2 x 5)-f ⁇ eld” having a certain size, wherein each of said square elements contains or does not contain any changes (different from the layer regions carrying no information) in optical properties (factors of absorption, reflection, refraction, birefringence, etc.) testifying the absence or presence of the information pit therein.
  • the multilayer fluorescent data carrier is exemplified by a ROM optical card wherein the fact of the presence or absence of fluorescence in a given square element is used as said optical changes.
  • each of said square elements could be either filled, as element 22, or not filled, as element 23, with a substance fluorescing at absorption of reading radiation.
  • All 256 combinations composing an information byte are represented on the information layer plane by fields of (2 x 5) square elements of two types,
  • the first 222 combinations are represented by fields characterized by such property that each square element 22 filled with a fluorescent substance (information pit (fluorescent mark)) has inside its "(2 x 5)-field" at least one identical adjacent element positioned transversely or lengthwise while each square element 23 free of fluorescent substance has inside the field identical adjacent element.
  • Two top and left bottom bytes in Fig. 2 satisfy this condition hereinafter referred to as parity condition.
  • the remaining combinations are represented each by one of two complementary fields wherein the parity condition can be violated only with regard to either left top or left bottom square element of the "(2 x 5)-field" (right bottom byte in Fig. 2). Totally, there are 52 such pairs of fields reserved for using as C&D combinations in excess of 256 ones needed to compose an information byte. At data recording, from the pair of fields one is chosen such that when joined to the left field therefrom it ensures satisfaction of the parity condition inside each longitudinal strip consisting of fields (bytes) joined one to another.
  • a minimal region filled with a fluorescent substance (or any other material having changes in optical properties other than ones inherent in regions carrying no information) consists of two adjacent fluorescent elements (information pits (fluorescent marks)) and thus has size a x 2a.
  • the layer's minimal region free of information pits has the same size.
  • Fig. 3 presents a conversion table for binary and ETT codes.
  • identification of fluorescent and non-fluorescent square elements in each information layer of the multilayer fluorescent carrier takes place layer by layer as it moves under the Linear CCD array (or vice versa, as the Linear CCD array moves along the card) lengthwise (and transversely, if necessary) at a rate timed with both the magnitude of the channel bit and the operating frame rate of the photodetector array.
  • pairs of adjacent elements of each transverse column are identified simultaneously.
  • Both elements are considered information-carrying pits when the signals amved from individual pixels of the CCD camera covering respective square elements of the fluorescent information layer exceed some level Ii. When both signals do not exceed some level L 2 ⁇ Ii, then both elements are not pits. When the above- mentioned terms are not met, the square element with a higher signal level is identified as an information pit, while the element with a lower signal level is not an information pit.
  • the Ii and L2 magnitudes are preset a priori. They depend on the channel bit length, correlation between the information pit (fluorescent mark) size and the CCD camera's elementary pixel size, reader wavelength, numerical aperture of the lens and magnification factor thereof. For a given reading device, they can be assumed as known.
  • Fig. 4 schematically presents one of the embodiments of proposed optical pickup for reading data generated using the ETT method of two-dimensional encoding hi the fluorescent carrier made as a multilayer optical card.
  • Optical pickup 40 is designated for reading data stored in one of information layers 41 of fluorescent carrier 42.
  • Said optical pickup comprises source of reading radiation 43 with such a wavelength that it excites information pit fluorescence, dichroic mirror 44, transmitting reading radiation 55 and reflecting fluorescent (information-carrying) radiation 53, optical system 45 shaping requisite spatial configuration 56 of reading beam 55 in the location of a given information layer and fluorescent image thereof in the plane of location of one- or two-dimensional photodetector array 46.
  • reading involves movement of the reading head comprising items 43, 44, 45 and 46, and fluorescent optical card 42 relative to each other.
  • the reading head is immobile while the optical card is by means of device 47 set to linear motion relative to said reading head lengthwise and transversely (directions "A") and rotationally (direction "B”) for their angular positioning relative to each other.
  • a source of reading radiation 43 there can be used either one CW diode laser or a matrix of light-emitting diodes (LED) (organic or solid-state) or a matrix of vertical cavity surface emitting lasers (VCSEL) integrated with microelectronic circuitry controlled by computer as well as controllable transparency, etc.
  • LED light-emitting diodes
  • VCSEL vertical cavity surface emitting lasers
  • photodetector matrix 46 there can be used a multitude of photodiodes, phototransistors and other photosensitive elements. The most preferable are Charge-Coupled Devices (CCD cameras) 51.
  • CCD cameras Charge-Coupled Devices
  • Optical system 45 incorporates at least linear array 48 of microlenses 49 and servo mechanism 50 enabling focusing error check and autotracking as well as microlens linear array movement along axis Z within 1 - 3 mm for reading data from given fluorescent layer 41 of multilayer carrier 42.
  • said optical system enables operation of the reading head in the controllable magnification mode.
  • the number of microlenses 49 can be equal to the number of CCD cameras 51 in photoreceiver linear array 46.
  • Card 60 can have width H equal to the length of linear array 61 of CCD cameras 62.
  • the length of card 60 may be arbitrary.
  • Each information layer of the card consists of N information strips of width h.
  • Each strip 63 is equipped with special C&D ("control and display") track 64 with periodically written thereon information pits 65 enabling timing and autotracking of linear array 61 of CCD cameras 62 as it moves relative to card 60.
  • C&D control and display
  • a diagram of continuous joint movement of the first two CCD cameras of the linear array along and across optical card 60 is shown by dotted line in Fig. 6. The synchronous movement of all other CD cameras of linear array 61 takes place in a similar way.
  • the device schematically presented in Fig. 4 operates as follows. Upon transmission through dichroic mirror 44, reading radiation beam 55 is focused by means of optical system 45 in the plane of information-carrying layer 41 subjected to reading as intensity-uniform spatial configuration 56 matching the configuration of photodetector linear array 46 constructed to certain scale. Fluorescent radiation 53 induced by reading radiation 55 from source 43 is collected by that same optical system 45 and upon reflection from dichroic mirror 44 is presented to certain scale in the plane of photodetector linear array 46. Electric signals 57 arriving from the photodetector linear array, following their identification as described above, are converted to data and sent to a customer while control and display information signals are utilized to ensure normal operation of servo mechanism 50, actuator 47 and power control unit for reading radiation source 43.
  • the fluorescent information carrier should have the following parameters;
  • one information layer of the optical card has width 10 cm equal to the length of a linear array of 10 CCD cameras. If the layer length is 10 cm, said layer contains approximately 6 GB of information (or approximately 60 GB of information in 10 layers). Each layer consists of 250 information strips 400 urn wide and 10 cm long.
  • Each CCD camera has 1000 x 1000 pixels and is capable of comparing the signal from each pixel with two levels and the signals from adjacent pixels between each other. If a CCD-camera pixel is equal to 8 urn, the approximate size of each camera is 1 cm x 1 cm and that of the whole linear array 10 cm x 1 cm. With a 20- fold magnification, the camera pixel size coincides with the magnified pit size. In this case, if the camera generates 30 frames per second, the whole linear array can read at the rate of 3-10 8 pit/s which in terms of the ETT code is 30-10 6 B/s, or approximately 220 Mb/s.
  • the rate of the linear CCD array movement above the optical card is found from the assumption that the way of 400 urn (the field accepted by one camera as data pit-to-CCD pixel) covered within the time interval between two consecutive frames is 1/30 s.
  • the movement rate is approximately 12 mm/s, which is about 10 times less than the rate of one-time data reading from a CD optical disc.
  • a possible embodiment is when a CCD camera pixel is 4 ⁇ m, i.e. one information pit is read in 4 pixels of the CCD camera (to be more exact, in 1/4 of pit is read in one pixel). In this case, the reading rate slows down 4 times making approximately 55 Mb/s but the reading accuracy significantly improves resulting in a considerably reduced reading error probability.
  • the proposed ETT-method of two-dimensional encoding of data on fluorescent carriers enables the same recording density as the EFM- encoding techniques used in DVD memory systems (see Table 1 ),
  • the ETT-encoding method ensures provides fluorescent memory systems with other advantages: 1.
  • the size of the minimal region filled with a fluorescent substance comparable with the size of the CD-format pit (and twice as big as the size of the minimal information pit of the DVD-format) facilitates the process for manufacturing a multilayer fluorescent information carrier and enables a higher fluorescent signal on reading thus facilitating operation of the reader; 2.
  • the size of the ETT channel bit more than the CD one by a factor of 1.5 (and three-fold larger than that of the DVD format) allows a significant reduction in the frequency band and accordingly the reader photoreceiver noise; 3.
  • Virtually 100% filling of the information layer area with fluorescent marks (information pits) permits application of parallel reading methods and enables an increase in the reading rate by tens of times in comparison with the DVD systems;
  • the proposed ETT (eight-to-ten) method of two-dimensional data encoding can be used not only in one- or multilayer fluorescent information carriers but also in carriers based on other physical and chemical principles, such as photorefractive crystals, photopolymers, magnetooptical, phase-change and persistent spectral-hole-burning recording systems, as well as in a number of other two- and three-dimensional carriers of ROM-, WORM- and WER- type.
  • the fluorescent information carrier has been discussed as an optical card allowing a simplest possible realization of the design of an optical pickup with parallel data reading.
  • the proposed encoding method is applicable to other forms of optical memory, for example, such as an optical disc, optical memory plate, optical memory tape, or optical memory drum (cylinder), etc.
  • said method can be also used for three- 5 dimensional volumetric data encoding as volumetric bytes recorded within a specified microvolume using the two-photon procedure, each said byte consisting of N number of cubic elements of certain size. Data can be read by means of either one- or two-photon procedure.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

La présente invention concerne un procédé de codage bidimensionnel 8/10 ou 'ETT' (pour 'Eight-To-Ten') pour de l'information mémorisée essentiellement sur des supports optiques bidimensionnels ou tridimensionnels à fluorescence. Le procédé garantit spécifiquement la même densité d'enregistrement que les supports DVD à code de modulation 8/14 ou 'EFM' (pour 'Eight-Fourteen Modulation'), mais avec une alvéole d'information (marque fluorescente) d'environ 0,8 x 0,4. Ces plus grandes dimensions des alvéoles permettent, d'une part des procédures plus simples pour la fabrication des supports multicouches à fluorescence, notamment les ROM, et d'autre part un signal fluorescent de lecture plus puissant. La densité d'enregistrement élevée résulte d'un remplissage virtuellement à 100% de la zone de la couche d'information, c'est-à-dire pratiquement sans intervalle entre les marques fluorescentes. Cela permet le recours à des procédures de lecture de données en parallèle et une vitesse de lecture 10 fois plus élevée que dans le cas des systèmes de DVD, pour une augmentation de la dimension du bit canal à 0,4 νm, ce qui est 1,5 à 3 fois plus que pour les formats CD et DVD.
PCT/US2001/023931 2000-07-31 2001-07-31 Procédé de lecture/écriture de données avec utilisation d'un support optique porteur de configurations d'alvéoles d'information WO2002011050A2 (fr)

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Application Number Priority Date Filing Date Title
AU2001284682A AU2001284682A1 (en) 2000-07-31 2001-07-31 Method for data reading/writing using an optical carrier with pattern information pits

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US22191500P 2000-07-31 2000-07-31
US60/221,915 2000-07-31
US09/780,620 US6507545B2 (en) 2000-12-12 2001-02-12 Method for data reading/writing using an optical carrier with pattern information pits
US09/780,620 2001-02-12

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WO2002011050A3 WO2002011050A3 (fr) 2002-06-06

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1428173A2 (fr) * 2001-07-10 2004-06-16 D Data Inc. Systeme a memoire optique pour rechercher des informations sur une carte optique fluorescente multicouche de type rom
WO2006013528A1 (fr) * 2004-07-29 2006-02-09 Koninklijke Philips Electronics N.V. Support d'informations avec protection contre la copie, systeme de lecture d'un tel support
WO2006136118A2 (fr) * 2005-06-24 2006-12-28 Intv, A.S. Support d'enregistrement optique, et dispositif optique permettant l'ecriture, la suppression et la lecture de donnees
US9275671B2 (en) 2011-06-09 2016-03-01 Case Western Reserve University Optical information storage medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5617389A (en) * 1993-06-08 1997-04-01 Pioneer Electronic Corporation Method of reproducing information of optical disc, method of recording and reproducing the same, apparatus for reproducing the same, and light detecting apparatus used in the reproducing apparatus
US5808986A (en) * 1993-02-17 1998-09-15 Vixel Corporation Multiple beam optical memory system with solid-state lasers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5808986A (en) * 1993-02-17 1998-09-15 Vixel Corporation Multiple beam optical memory system with solid-state lasers
US5617389A (en) * 1993-06-08 1997-04-01 Pioneer Electronic Corporation Method of reproducing information of optical disc, method of recording and reproducing the same, apparatus for reproducing the same, and light detecting apparatus used in the reproducing apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1428173A2 (fr) * 2001-07-10 2004-06-16 D Data Inc. Systeme a memoire optique pour rechercher des informations sur une carte optique fluorescente multicouche de type rom
EP1428173A4 (fr) * 2001-07-10 2007-06-13 Data Inc D Systeme a memoire optique pour rechercher des informations sur une carte optique fluorescente multicouche de type rom
WO2006013528A1 (fr) * 2004-07-29 2006-02-09 Koninklijke Philips Electronics N.V. Support d'informations avec protection contre la copie, systeme de lecture d'un tel support
WO2006136118A2 (fr) * 2005-06-24 2006-12-28 Intv, A.S. Support d'enregistrement optique, et dispositif optique permettant l'ecriture, la suppression et la lecture de donnees
WO2006136118A3 (fr) * 2005-06-24 2007-08-30 Intv A S Support d'enregistrement optique, et dispositif optique permettant l'ecriture, la suppression et la lecture de donnees
US9275671B2 (en) 2011-06-09 2016-03-01 Case Western Reserve University Optical information storage medium

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AU2001284682A1 (en) 2002-02-13

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