WO1990014663A1 - Disque optique interactif, son procede de fabrication et appareil d'enregistrement sur ce disque optique - Google Patents

Disque optique interactif, son procede de fabrication et appareil d'enregistrement sur ce disque optique Download PDF

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Publication number
WO1990014663A1
WO1990014663A1 PCT/US1990/002627 US9002627W WO9014663A1 WO 1990014663 A1 WO1990014663 A1 WO 1990014663A1 US 9002627 W US9002627 W US 9002627W WO 9014663 A1 WO9014663 A1 WO 9014663A1
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WO
WIPO (PCT)
Prior art keywords
layer
region
substrate
information
light
Prior art date
Application number
PCT/US1990/002627
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English (en)
Inventor
Bryan K. Clark
Robert Guerra
Original Assignee
Tandy Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tandy Corporation filed Critical Tandy Corporation
Publication of WO1990014663A1 publication Critical patent/WO1990014663A1/fr

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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
    • 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 the field of recording media.
  • one embodiment of the invention provides an optical disk upon which pre ⁇ recorded data or information and user-supplied data or information may be stored on the same optical disk.
  • Optical data storage media in the form of compact disks are well known as an alternative to long- playing records a'nd magnetic tape cassettes.
  • the disks with which consumers are familiar are optical read-only disks and the common disk player is designed specifically for this type of disk.
  • These disks have a reflective surface containing pits which represent data in binary form. A description of these pits and how they function is provided by Watkinson, "The Art of Digital Audio," Focal Press, Chapter 13.
  • Compact disks are currently produced by a pressing process similar to the process used to produce conventional long playing records.
  • the process referred to herein as the "mastering" process, starts by first polishing a plain glass optical disk.
  • This disk has an outside diameter from 200 to 240 mm, a thickness of 6 mm and undergoes various cleaning and washing steps.
  • the disk is then coated with a thin chrome film or coupling agent, a step taken to produce adhesion between the glass disk and a layer of photo-resist, which is a photosensi ⁇ tive material.
  • Data on a compact disk master tape are then transferred to the glass disk by a laser beam cutting method.
  • the glass disk is still completely flat after it is written on by the laser beam because pits are not formed until the glass is photographically developed.
  • the disk surface is first made electrically conductive and then subjected to a nickel evaporation process.
  • the disk now known as the glass master, then undergoes nickel electrocasting, a process which is similar to that used in making analog phono records.
  • a series of metal replications follow, resulting in a disk called a stamper.
  • the stamper is equivalent to a photographic negative in the sense that it is a reverse of the final compact disk; that is, there are now bumps were there should be pits.
  • This stamper is then used to make a pressing on a transparent polymer such as polyvinyl chloride, poly(ethyl-methacrylate) and polycarbonate.
  • the stamped surface is then plated with a reflective film such as aluminum'or other metal and finally a plastic coating is applied over the film to form a rigid structure.
  • the player operates by focusing a laser beam on the reflective metal through the substrate and then detecting reflected light.
  • the optical properties of the substrate such as its thickness and index of refraction, are thus critical to the player's detection systems and standard players are designed specifically with these parameters in mind.
  • the pits increase the optical path of the laser beam by an amount equivalent to a half wavelength, there ⁇ by producing destructive interference when combined with other (non-shifted) reflected beams.
  • the presence of data thus takes the form of a drop in intensity of the reflected light.
  • the detection system on a standard player is thus designed to require greater than 70% re ⁇ flection when no destructive interference occurs and a modulation amplitude greater than 30% when data is pre ⁇ sent.
  • Feyrer et a_L The medium disclosed in Feyrer et a_L. includes a lower expansion layer of a rubbery material which expands when heated.
  • the expansion layer is coupled to an upper retention layer which is glassy at ambient temperature and becomes rubbery when heated. Both layers are suppor- ted on a rigid substrate.
  • the expansion and retention layers each contain dyes for absorption of light at dif ⁇ ferent wavelengths. Data are recorded by heating the expansion layer by absorption of light from a laser beam at a "record" wavelength to cause the expansion layer to expand away from the substrate and form a protrusion or
  • Removal of the bump to erase the data is achieved by a second laser beam at an "erase" wavelength which is absorbed by the retention layer and not the expansion layer.
  • This beam heats the retention layer alone to a rubbery state where its visco- elastic forces and those of the expansion layer return it to its original flat configuration.
  • the write, read and erase beams all enter the medium on the retention layer side, passing through retention layer before reaching the expansion layer.
  • the invention described therein includes an expansion layer, a retention layer, and a reflective layer.
  • the reflective layer provides a double pass through the media for writing and erasing thereon.
  • optical storage media that would include both permanent data storage via pre-recording or write-once recording by a user as well as the ability to store user-supplied or erasable data.
  • An improved optical data storage method and apparatus is disclosed.
  • the method and apparatus permit storage of write protected data and user-supplied data on the same disk.
  • an optical storage disk is provided with two areal regions.
  • the first areal region is used for permanent or semi-permanent recorded informa ⁇ tion.
  • the permanent information may be applied by way of a pressing process or the like during the manufacture of the disk.
  • the second areal region includes a material which may written upon by a user.
  • the second areal re- gion is preferably an erasable media including, for example, a dye loaded expansion layer, and a retention layer for holding the expansion layer in an expanded state.
  • the second region is a write-once read-many (WORM) media.
  • the invention provides an optical media which includes a first layer used to im ⁇ press pre-recorded information such that it is permanent or write protected.
  • a second layer of the media is provided which can be recorded upon by a user.
  • the second layer includes an expansion region and a retention region for holding the expansion region in an expanded state.
  • Information is read from the first layer and the second layer by separate mechanisms. For example information may be read from the first layer by differ ⁇ ential absorption of a laser beam, while information may be read from the second layer by phase cancellation or absence of a reflected beam. Pre-recorded data and user- supplied data may be obtained substantially simultane ⁇ ously and are automatically synchronized.
  • the invention comprises a first region, the first region comprising non-erasable, optically-detectable information; and a second region, the second region adapted to record user- supplied optically-detectable information.
  • the storage medium in one embodiment is a substantially planar disk wherein the first region is horizontally displaced on said disk from said second region.
  • the first region is a first layer of a substantially planar disk and the second region is a second, vertically displaced layer of the disk.
  • a method of fabricating a data storage medium includes the steps of providing a substrate; providing vertically displaced regions on a surface of the substrate, the vertically displaced regions representing permanent optically-detectable information; and applying a user- recordable region on the substrate, the user-recordable region responsive to light of a first wavelength so as to represent optically-detectable user-supplied information.
  • a method of reading user-supplied and permanently-stored information from an optical disk comprises the steps of directing a first read beam of a first wavelength to a location on an opti- cal disk, the optical disk comprising a substrate having bumps representing the permanently-stored information in binary form; an expansion layer, the expansion layer absorptive of light of a wavelength of the first read beam; and a retention layer for holding the expansion layer in an expanded state, the expansion layer absorp ⁇ tive of a second read beam of a second wavelength; directing the second read beam to the location, the second read beam having the second wavelength; and based on an amount of the first read beam and the second read beam absorbed at the first location, determining if the user-supplied information and the permanently stored information are present at the location.
  • Figure 1 illustrates a first embodiment of an interactive compact disk disclosed herein.
  • Figure 2 illustrates the compact disk shown in Figure 1 in cross-section.
  • Figure 3 illustrates an alternative embodiment of the invention in cross-section.
  • Figure 4 qualitatively illustrates the light intensity of two reflected beams for the media illustra ⁇ ted in Figure 3.
  • FIG. 1 and 2 illustrate one embodiment of an optical storage media which may be used in accord with the invention.
  • the media includes a first areal region 2 and a second areal region 4.
  • the first areal region 2 is'used for temporary or permanent stor- age of user-supplied information such as software, data, voice recordings, or music recordings.
  • the second region 4 is used for permanent storage of pre-recorded software, data, voice recordings, music recordings, or other information.
  • the first region is an erasable media chosen from the media disclosed in co- pending application Serial No. 294,723 (assigned to the assignee of the present invention and previously incor ⁇ porated herein by reference) .
  • the second region is of the type readily known to those of skill in the art and disclosed in, for example, Watkinson (cited above) , which is incorporated herein by reference.
  • the first region and the second region are both mounted on a substrate 6 which may be a transparent material such as, for example, glass, polycarbonate, or the like.
  • the second region 4 includes a filler 8 or the like over the polycarbonate substrate.
  • the region 8 may be, for example, only the retention layer, only the expansion material, combinations of the two, or another material, preferably dye loaded. Region 8 could, alternatively. comprise the material of the reflective region, which would enable the second region to be CD compatible.
  • the first region includes an expansion layer 10 on the substrate. Above the expansion layer, a retention layer 12 is provided. Above both the first region 2 and the second region 4 a reflective layer 14 and a protec ⁇ tive layer 16 are provided. Sealing regions 18 and 20 are provided at the inside and outside edges of the disk.
  • the second region of the media is impressed with permanent information by a pressing process like the one described in Watkinson et a_l. Thereafter, the outer, first region of the disk is coated with the expansion and retention layers and the inner, second region of the disk is coated with the expansion, retention, and/or reflec- tive materials.
  • the reflective layer 14 is then provided over both the first and second regions. Similarly, the protective layer 16 is provided over the entire reflec ⁇ tive layer.
  • the expansion, retention, and reflective layers are selected from the materials disclosed in copending application Serial
  • the second region is a write-once read-many region.
  • Such media include abla ⁇ tive materials and the like.
  • a disk playing and recording unit such as de ⁇ scribed in copending application Serial No. 294,723 is then used to play and record information on the disk. Specifically, the unit will identify information in the second region in the same manner as it does with a stan ⁇ dard compact disk. At one or more selected locations in the pre-recorded information, a unique code is provided to permit the player to address any information that is recorded in the first region.
  • the invention has been described above primarily with reference to the use of erasable media using expansion/retention layers for recordation of user-supplied information, but it will be apparent to those of skill in the art that other media could readily be utilized. For example, magneto-optic media may be utilized in some embodiments. A separate recording head may be necessary if the two regions operate on different principles and, therefore, the embodiment shown in Figures 1 and 2 is preferred.
  • Figure 3 An alternative preferred embodiment of the invention is illustrated in Figure 3, which shows a portion of recording media in cross-section.
  • the embodiment shown 'in Figure 3 provides a permanent data record on a first layer and coatings on the same areal region which are "active", i.e., layers on which a user may record and erase at will.
  • the disk includes a substrate or similar layer into which data bumps or marks 102a and 102b are impressed.
  • the data marks 102 in the substrate may be created by conventional means known to those of skill in the art such as the pressing process or via a write-once read-many process.
  • the data bumps on the substrate are significantly deeper than on prior art compact disks for easier data proces ⁇ sing.
  • the data bumps 102a and 102b are up to 6000 A deep.
  • the pits may serve as a tracking guide for a recorder used in conjunction with the disk.
  • the substrate is preferably a clear or nearly clear material which provides protection to the media from outside forces and provides structural rigidity.
  • the substrate may be made of glass, polycarbonate, or the like. Other materials of construction will be apparent to those of skill in the art.
  • the substrate is poly ⁇ carbonate and is about l mm thick.
  • an expansion layer 104 Adjacent the substrate, an expansion layer 104 is provided.
  • the expansion layer is formed of a material which (a) absorbs a percentage of light energy passing through it; (b) displays a high coefficient of thermal expansion, particularly when compared to the other layers of the medium; and (c) displays a high coefficient of elasticity to the extent that it will expand readily when heated at the temperatures encountered during a recorda ⁇ tion process without exceeding its upper expansive limit and contract to its original flat condition upon cooling unless retained by the retention layer.
  • the expansion layer material should be near or above its glass transition temperature, which is pre ⁇ ferably below 30"C.
  • Coefficients of thermal expansion above about lxlO ' V'C are preferred, with those greater than about 5xl0 "4 /*C particularly preferred and those greater than about 7.5xl0 '4 /*C most preferred.
  • the degree of absorptivity of light energy could be between
  • a maximum double pass absorption at the compact disk read wavelength (780 nm) of about 10% is most preferred.
  • the expansion layer may be selected from the group epoxys, polyurethane, polymers, amorphous polymers, rubber, natural rubber, butyl rubber, silicone rubber, styrene-butadiene rubber, cellulose acetate, cellulose acetate-butyrate, polystyrene, polysulfonamide, poly ⁇ carbonate, cellulose nitrate, pol (ethyl-methacrylate) , poly(vinyl butyryl) , aromatic polyesters, polyamides, acrylic polymers, polyvinyl acetate, silicone resins, alkyd resins, styrene-butadiene copolymers, vinyl chloride-vinyl acetate copolymers, nitrocellulose, ethylcellulose, and mixtures thereof.
  • the expansion layer is selected from the materials disclosed in copending application Serial
  • the expansion layer is between about 1 micron or less thick.
  • a retention layer 106 Adjacent the expansion layer, a retention layer 106 is provided.
  • the retention layer is formed of a material that (a) absorbs a percentage of light energy passing through it; (b) displays a glass transition tem ⁇ perature which is above room temperature; (c) is rubbery, when above its glass transition temperature, with suffi ⁇ cient elasticity to permit it to conform to the contour of the distortion' formed in the second layer by the expansion of the first layer, when the first active material layer is heated; and (d) displays sufficient rigidity and strength below its glass transition tempera ⁇ ture such that it will hold the expansion layer in an expanded condition, even though the first layer is cooled to ambient temperature.
  • the retention layer 106 is formed of material or combinations of materials which display at least some light absorption at the wavelength of an erase beam.
  • the wavelength of the erase beam light may be chosen from a wide spectrum of available light wavelengths.
  • the degree of absorp ⁇ tivity may vary from wavelength to wavelength and from retention material to retention material but may be for example about 30% to 45% at wavelengths between 650 nm and 860 nm.
  • the retention layer may be made from epoxys, polyurethane, polymers, amorphous polymers, rubber, natural rubber, butyl rubber, silicone rubber, styrene-butadiene rubber, cellulose acetate, cellulose acetate-butyrate, polystyrene, polysulfonamide, poly ⁇ carbonate, cellulose nitrate, poly(ethyl-methacrylate) , poly(vinyl butyryl) , aromatic polyesters, polyamides, acrylic polymers, polyvinyl acetate, silicone resins, alkyd resins, styrene-butadiene copolymers, vinyl chloride-vinyl acetate copolymers, nitrocellulose, ethylcellulose, and mixtures thereof.
  • the retention layer is made in accordance with copending application Serial No. , entitled “Recording Media” and assigned to the assignee of this invention.
  • the thickness of the retention layer is approximately 0.5 to 1.5 microns in one embodiment. In a preferred embodiment, the retention layer is between about 0.5 and 1.0 microns thick.
  • a reflective layer 108 Adjacent the retention layer, a reflective layer 108 is provided. Reflective layer 108 is a reflec ⁇ tive material which serves to reflect light (e.g., more than 25% of the light striking it) back through the expansion layer and retention layer for the purpose of improved data recordation and data detection. During the recordation process the reflective properties of the reflective layer cause an entering light beam to double pass through the media, thus doubling the effective light beam path inside the media.
  • the reflective layer is formed of materials such as gallium, aluminum, copper, silver, gold, indium, eutectic alloys of bismuth with tin or cad- miu , or mixtures thereof.
  • a protective layer 110 may also be provided.
  • the protective layer serves to absorb data bumps created in the expansion layer and protect the media from exter ⁇ nal forces.
  • the protective layer may, for example, be made of glass or polycarbonate.
  • the data bumps may be either at the same location as data bumps in the substrate (as illustrated by bumps 102b/112b) or at different locations in the substrate (as illustrated by bumps 102a/112a) .
  • the retention layer 106 A significant portion of the entering light is passed into the retention layer 106, which is also heated and softened, thereby accommodating the expansion layer more easily.
  • the retention layer may be heated during writing primarily by conduction or the expansion layer may absorb light at a first wavelength (e.g., 680 nm) while the retention layer absorbs light at a second wavelength (e.g., 830 nm) . Light may then be applied including both wavelengths, heating both layers simultaneously for writing a data bump. Conversely, for erasing, only the' second wavelength is applied to the media, thereby heating, softening, and releasing the retention layer.
  • the layers absorb light as disclosed in copending application Serial No.
  • Differential absorption of light between the retention and expansion layer is obtained by dye-loading the layers with different dyes.
  • Dyes or pigments which may be used singly or in combination are nigrosin blue, aniline blue, calco oil blue, ultramarine blue, methylene blue chloride, monastral blue, malachite green ozalate, sudan black BM, tricon blue, macrolex green G, DDCI-4, and IR26.
  • the expansion layer is loaded with savinal blue and the retention layer is loaded with tricon blue and savinal blue.
  • the permanent data bumps 102a and 102b are read by a separate, but preferably substantially simultaneous, mechanism from user-supplied data bumps 112a and 112b.
  • the permanent bumps 102a and 102b are read by differential absorption of an incom- ing "read" laser beam.
  • the user-supplied bumps are read by phase cancellation or absence of a reflected beam.
  • Figure 3 illustrates four possible light paths into the substrate, i.e., P 1 , P 2 , P 3 , and P 4 -
  • Light path P passes through an area of the substrate that does not contain any information, i.e., there is neither a perma- nent bump or a user-recorded bump in path P ⁇ .
  • Light path P passes through a permanent information bump, but not a user-supplied information bump.
  • Path P 3 passes through both a permanent information bump and a user-supplied information bump.
  • Path P 4 passes through only a user- supplied information bump.
  • Figure 4 illustrates (quali ⁇ tatively) the intensity of 680 and 830 nm beams reflected from the media as a function of location.
  • the expansion layer 104 is provided with a first dye ("X") which absorbs light at a wavelength of the "read” or playback beam.
  • the playback beam has a wavelength of about 830 nm.
  • the retention layer is provided with a dye "Y" which does not absorb significant amounts of light at the wavelength of the read beam but which does absorb significant amounts of light at the wavelength of an "erase" beam.
  • the erase beam may be, for example, about 680 to 780 nm.
  • the erase beam is also used for reading from the substrate, but its inten ⁇ sity is substantially reduced during reading operations.
  • the erase beam is operated at about 10-15 milliwatts when erasing from the media but at about 1 milliwatt when reading from the media. It will be apparent to those of skill in the art that erasing and reading user-supplied data could be performed by provid ⁇ ing two dyes in the expansion layer and using different wavelengths for reading and erasing, without departing from the scope of this invention.
  • the read laser in path P (con ⁇ taining no data bumps) has its beam intensity reduced by an amount proportional to twice the thickness of the expansion layer 104 plus a small loss at the reflective layer 108, in the retention layer 106, and in the sub ⁇ strate 100.
  • losses at the reflective layer and in the substrate and reten- tion layer are assumed to be small and in any event constant and are ignored.
  • the erase beam (operated at the reduced level) has a beam intensity loss proportional to the thickness of the retention layer 106.
  • Light levels at a detector (not shown) for the erase beam and read beam resulting from path P represent latent or zero signal intensity, i.e., binary zeros for the permanent and user-supplied data.
  • Figure 4 qualitatively illustrates the inten- sity of beams reflected from the media as a function of location.
  • the intensities of reflected beams at 680 nm (the erase beam wavelength) and 830 nm (the read beam wavelength) are shown as a function of distance along the substrate in Figure 3. It is assumed that the reflected beam intensities along path P are the baseline or 100% levels.
  • the read beam intensity is decreased signi ⁇ ficantly below the level of path P .
  • the intensity of the beam is reduced by an amount proportion ⁇ al to twice the thickness of the expansion layer plus twice the depth of a permanent data bump.
  • a reduced signal intensity of the read beam along path P 2 or lower, there ⁇ fore represents a binary l, i.e., the presence of a permanent data bump, and the signal intensity of the erase beam continues to represent a binary 0 since 100% reflectance is observed.
  • the read beam When the read and erase beam are applied along path P , the read beam suffers not only an intensity loss due to the increased depth of the permanent data bump in the substrate, but also an intensity loss due to phase cancellation and light scattering due to the temporary, user-supplied bump.
  • the erase beam will also detect the presence of a bump due to light scattering and phase cancellation.
  • both the read beam and erase beam suffer some loss due to scattering and phase cancellation due to the temporary bump only.
  • the erase beam and read beam each reflect distinctly different levels of light depending upon whether a permanent data bump or a temporary user-supplied data bump are present.
  • a test for the absolute level of intensity of the reflected beam(s) can be used to determine whether information is erasable or non-erasable.
  • the reflected read beam is below some level (e.g., about 50% of the P intensity) , it is known that a permanent data bump is present.
  • the intensity of the reflected erase beam e.g. , about 50% of the P intensity
  • it is known that a user-supplied data bump is present.
  • suffici ⁇ ently sensitive detection electronics are used since unique levels are reflected for each of the four paths from the reflected read beam.
  • Dual beams are preferred in order to obtain increased data resolution. Dual beams provide improved data detection, particularly if, for example, the data bumps are slightly offset or the like.
  • Table 1 provides qualitative reflected beam intensities, along with their corresponding indication of the presence of user-supplied and permanent data. Table 1*

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  • Optical Recording Or Reproduction (AREA)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

Un procédé et un appareil permettent d'enregistrer et de lire des informations (4) stockées de manière permanente et des informations (2) fournies par l'utilisateur sur un disque optique (Fig. 1). Les informations permanentes sont contenues dans des creux (102a, 102b) formés dans un substrat (100) du disque optique (Fig. 3). Les informations (112a, 112B) fournies par l'utilisateur sont enregistrées dans une couche d'expansion/rétention (104) adjacente au substrat (100). Les informations permanentes (4, 102a, 102b) et les informations (2, 112a, 112b) fournies par l'utilisateur peuvent être lues par des faisceaux laser à longueurs d'ondes différentes.
PCT/US1990/002627 1989-05-25 1990-05-10 Disque optique interactif, son procede de fabrication et appareil d'enregistrement sur ce disque optique WO1990014663A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US35750489A 1989-05-25 1989-05-25
US357,504 1989-05-25

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WO1990014663A1 true WO1990014663A1 (fr) 1990-11-29

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EP (1) EP0473672A4 (fr)
JP (1) JPH04507321A (fr)
AU (1) AU5669490A (fr)
CA (1) CA2055454A1 (fr)
WO (1) WO1990014663A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0841658A2 (fr) * 1996-11-12 1998-05-13 Victor Company Of Japan, Ltd. Disque optique, appareil d'enregistrement et de reproduction de disque et méthode de production du disque

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004209970A (ja) * 2002-12-16 2004-07-29 Canon Inc 液体タンクおよび記録装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4371954A (en) * 1980-02-01 1983-02-01 Thomson-Csf Reversible memory structure with thermo-optical writing and optical reading and process for writing and erasing said structure
US4578788A (en) * 1983-06-02 1986-03-25 International Business Machines Corporation High performance optical storage medium with separate mechanical servo tracks embedded within the medium
US4703469A (en) * 1983-04-07 1987-10-27 Plasmon Data Systems, P.V. Optical data recording using radiation of different characteristics
US4719615A (en) * 1983-08-22 1988-01-12 Optical Data, Inc. Erasable optical data storage medium
US4769802A (en) * 1984-06-07 1988-09-06 Victor Company Of Japan, Ltd. Information recording medium disc and method and apparatus for recording/reproducing information using the disc
US4825430A (en) * 1986-12-19 1989-04-25 Optical Data, Inc. Erasable optical data storage medium having an embedded servo track and a subsurface recording interface
US4855992A (en) * 1987-02-13 1989-08-08 Kabushiki Kaisha Toshiba Reversible optical recording medium with an optothermally deformable recording layer
EP0338776A2 (fr) * 1988-04-19 1989-10-25 Optical Data, Inc. Milieux formant des bosses avec couche mince réflective intermédiaire et méthodes pour l'enregistrement sur, la reproduction et l'effacement de ceux-la
US4918682A (en) * 1988-02-05 1990-04-17 Tandy Corporation Ablative and bump-forming optical recording media including a metallic reflective layer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60263353A (ja) * 1984-06-08 1985-12-26 Matsushita Electric Ind Co Ltd 光デイスク

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4371954A (en) * 1980-02-01 1983-02-01 Thomson-Csf Reversible memory structure with thermo-optical writing and optical reading and process for writing and erasing said structure
US4703469A (en) * 1983-04-07 1987-10-27 Plasmon Data Systems, P.V. Optical data recording using radiation of different characteristics
US4578788A (en) * 1983-06-02 1986-03-25 International Business Machines Corporation High performance optical storage medium with separate mechanical servo tracks embedded within the medium
US4719615A (en) * 1983-08-22 1988-01-12 Optical Data, Inc. Erasable optical data storage medium
US4769802A (en) * 1984-06-07 1988-09-06 Victor Company Of Japan, Ltd. Information recording medium disc and method and apparatus for recording/reproducing information using the disc
US4825430A (en) * 1986-12-19 1989-04-25 Optical Data, Inc. Erasable optical data storage medium having an embedded servo track and a subsurface recording interface
US4855992A (en) * 1987-02-13 1989-08-08 Kabushiki Kaisha Toshiba Reversible optical recording medium with an optothermally deformable recording layer
US4918682A (en) * 1988-02-05 1990-04-17 Tandy Corporation Ablative and bump-forming optical recording media including a metallic reflective layer
EP0338776A2 (fr) * 1988-04-19 1989-10-25 Optical Data, Inc. Milieux formant des bosses avec couche mince réflective intermédiaire et méthodes pour l'enregistrement sur, la reproduction et l'effacement de ceux-la
US4896314A (en) * 1988-04-19 1990-01-23 Optical Data, Inc. Bump-forming media including thin intermediate reflective layer and methods for writing, reading, and erasing same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0473672A4 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0841658A2 (fr) * 1996-11-12 1998-05-13 Victor Company Of Japan, Ltd. Disque optique, appareil d'enregistrement et de reproduction de disque et méthode de production du disque
EP0841658A3 (fr) * 1996-11-12 1998-10-28 Victor Company Of Japan, Ltd. Disque optique, appareil d'enregistrement et de reproduction de disque et méthode de production du disque
US6031808A (en) * 1996-11-12 2000-02-29 Victor Company Of Japan, Ltd. Optical disc, formed from joining individual discs and method and apparatus for manufacturing and using such optical disc

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JPH04507321A (ja) 1992-12-17
EP0473672A1 (fr) 1992-03-11
EP0473672A4 (en) 1992-04-29
AU5669490A (en) 1990-12-18
CA2055454A1 (fr) 1990-11-26

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