EP1214710A1 - Memoire de donnees - Google Patents

Memoire de donnees

Info

Publication number
EP1214710A1
EP1214710A1 EP00956357A EP00956357A EP1214710A1 EP 1214710 A1 EP1214710 A1 EP 1214710A1 EP 00956357 A EP00956357 A EP 00956357A EP 00956357 A EP00956357 A EP 00956357A EP 1214710 A1 EP1214710 A1 EP 1214710A1
Authority
EP
European Patent Office
Prior art keywords
data memory
core
polymer carrier
memory according
refractive index
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.)
Withdrawn
Application number
EP00956357A
Other languages
German (de)
English (en)
Inventor
Jörn LEIBER
Bernhard MÜSSIG
Stefan Stadler
Steffen Noehte
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.)
Scribos GmbH
Original Assignee
EML European Media Laborat GmbH
Tesa SE
Tesa Scribos GmbH
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 EML European Media Laborat GmbH, Tesa SE, Tesa Scribos GmbH filed Critical EML European Media Laborat GmbH
Publication of EP1214710A1 publication Critical patent/EP1214710A1/fr
Withdrawn legal-status Critical Current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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0025—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with cylinders or cylinder-like carriers or cylindrical sections or flat carriers loaded onto a cylindrical surface, e.g. truncated cones
    • 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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/003—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent

Definitions

  • the invention relates to a data storage device with an optical information carrier which has several layers of a polymer carrier.
  • DE 298 16 802 describes a data storage device with an optical information carrier which contains a polymer carrier in the form of a polymer film.
  • a polymer carrier in the form of a polymer film.
  • the polymer film is spirally wound in several layers on a core, with an adhesive layer between each of the adjacent layers.
  • Information can be written into this data memory by locally heating the polymer film with the aid of a write beam from a data drive, as a result of which the refractive index and thus the reflection (reflectivity) change locally at the interface of the polymer film. This can be detected with the aid of a read beam in the data drive.
  • the core can be optically transparent and have a cutout in its central area, which serves to accommodate the writing and reading device of a data drive.
  • the read and write device is moved relative to the data memory while the data memory is at rest, so that the data memory does not have to be balanced with regard to a rapid rotational movement.
  • the core of the previously known data storage device is made of polystyrene.
  • Polystyrene is not particularly scratch-resistant and has a refractive index (1.59 at the wavelength of the reading beam used), which differs significantly from that of the polymer film material (1.49 for biaxially oriented polypropylene at the wavelength of the reading beam). Since the wall of the core must be irradiated by the write beam and the read beam when the data storage device is used in a data drive, the write and read device of which is placed in the recess of the core (and even twice with each read operation), a bad one caused by scratches has an effect optical quality and especially the reflection losses associated with the large difference in refractive index.
  • the data storage device has an optical information carrier which has a plurality of layers of a polymer carrier, through which information can be read out from a preselected polymer carrier layer and optionally written into a preselected polymer carrier layer.
  • the information carrier is formed around an optically transparent core, the refractive index of which differs from the refractive index of the polymer carrier by less than 0.08. The refractive indices are based on a light wavelength with which the optical reading device of a drive tuned to the data memory works.
  • the core is preferably sleeve-like or cylinder-like and has a cutout in its central region.
  • This also includes configurations in which the cross section of the periphery of the core is not circular, but has a step so that the core is better adapted to the course of the layers of the polymer carrier adjacent to the core. This is explained in more detail below using an exemplary embodiment.
  • the cutout in the central area of the core can be set up to accommodate a reading device and, optionally, a writing device of a drive matched to the data memory.
  • the data memory is used in a drive which has a reading device and optionally a writing device, the reading device and the optional writing device being arranged in the cutout in the central region of the core and for reading or writing information relative to that Data storage are moved while the data storage is at rest.
  • the data storage does not have to be balanced in order to enable high rotational speeds, which has a favorable effect on the production costs.
  • the polymer carrier which preferably has a polymer film, is wound spirally around the core.
  • a very high storage density can be achieved.
  • 10 to 30 layers of polymer film can be wound on top of one another, but also more or less.
  • a thickness of the polymer film between 10 ⁇ m and 100 ⁇ m, preferably less than 50 ⁇ m or around 35 ⁇ m, the information on different polymer film layers can be separated from one another in a readily resolvable manner with the aid of reading and writing devices known for example from DVD technology.
  • the polymer carrier is not wound spirally around the core, but that, for example, several essentially concentric layers of the polymer carrier are arranged around the core.
  • the core can have a plastic.
  • a plastic of optically high quality is preferably used as the core material.
  • the refractive index of the plastic material must be in the range of the refractive index of the polymer carrier.
  • PMMA polymethyl methacrylate
  • Zeonex a cycloolefinic sold by Nippon Zeon under the name "Zeonex” are suitable Copolymer, especially if a polymer film made of biaxially oriented polypropylene (BOPP; see below) is used for the polymer carrier.
  • the core is made of plastic or consists entirely of plastic
  • the core is preferably provided with an anti-scratch coating.
  • Anti-scratch coatings such as those e.g. are known from eyewear optics, at least largely prevent scratching of the surfaces of the core exposed to a reading beam or writing beam, which increases the operational reliability and service life of the data memory. It must be ensured that the anti-scratch coating does not lead to a large jump in the refractive index.
  • the core can also have a glass. Glasses generally have a better optical quality and a higher scratch resistance than plastics. A core made of glass also has mechanical advantages, because a data storage device with such a core is difficult to deform.
  • a type of glass which is particularly suitable for use with a polymer carrier made of biaxially oriented polypropylene is the glass sold by Schott under the name "BK7".
  • An adhesive layer is preferably arranged in each case between adjacent polymer carrier layers in order to fix the polymer carrier layers to one another.
  • an adhesive layer can have a thickness in the range between 1 ⁇ m and 40 ⁇ m, preferably less than 25 ⁇ m or around 2 ⁇ m.
  • a suitable adhesive is, for example, an air bubble-free acrylate adhesive that is crosslinked, for example, chemically or by UV or electron radiation.
  • One or more layers with different or additional functions can also be located between adjacent polymer carrier layers, for example a layer with dye molecules of an absorber (see below).
  • the refractive index of the adhesive layer preferably deviates only slightly from the refractive index of the polymer carrier in order to minimize disturbing reflections of the reading beam or the writing beam at a boundary layer between a polymer carrier layer and an adjacent adhesive layer. It is particularly advantageous if the difference in refractive indices is less than 0.005. An existing difference in refractive indices can, however, be used to format the data memory.
  • the refractive index of the polymer carrier can be changed locally by heating.
  • a polymer film made of biaxially oriented polypropylene (BOPP) can be considered as the material for the polymer carrier, but other materials can also be used. If polypropylene is pre-stressed on two levels after extrusion to the film, a high level of self-energy is stored in the material. Local heating, for example by means of a writing beam, then leads to a strong change in material due to reshaping, and indeed even with the deposition of a relatively small amount of energy per unit area. In this way, for example, a change in the refractive index of about 0.2 over an area for a stored information unit with a diameter or a side length of about 1 ⁇ can be achieved, which can be easily detected with the aid of a reading beam.
  • BOPP biaxially oriented polypropylene
  • An absorber can be assigned to the polymer carrier, which is set up to at least partially absorb a write beam and to at least partially emit the heat generated thereby locally to the polymer carrier.
  • the absorber contains, for example, dye molecules, which are contained, for example, in the polymer carrier or in an adhesion layer adjacent to the polymer carrier, and enables local heating of the polymer carrier sufficient for changing the refractive index with a relatively low intensity of the writing beam.
  • FIG. 1 shows a data memory according to the invention, which has a spiral-wound polymer film, in a schematic perspective illustration, parts of a drive which is matched to the data memory being arranged in a cutout in the central region of the data memory,
  • FIG. 2 shows a schematic cross section through the data memory from FIG. 1 and
  • FIG. 3 shows a schematic cross section through the central area of a data memory, which has a core with a periphery differently than that in FIG. 2.
  • FIG. 1 shows a schematic representation of a data store 1 and a read and write device 2 of a drive that is matched to the data store 1.
  • the data memory 1 has a number of layers 10 of a polymer carrier used for information storage in the form of a polymer film 11 which is wound spirally around an optically transparent core.
  • the core is not shown in FIG. 1 for the sake of clarity; it is located within the innermost layer 10 and is explained in more detail with reference to FIG. 2.
  • the individual layers 10 of the polymer film 11 are shown in FIG. 1 as concentric circular rings, although the layers 10 are formed by spiral winding the polymer film 11.
  • An adhesive layer 12 is arranged between adjacent layers 10 of the polymer film 11. For reasons of clarity, the adhesive layers 12 are shown in FIG. 1 in a thickness that is not to scale.
  • the polymer film 11 consists of biaxially oriented polypropylene and was used in both before winding Surface directions biased.
  • the polymer film 11 has a thickness of 35 ⁇ m; other thicknesses in the range from 10 ⁇ m to 100 ⁇ m or thicknesses outside this range are also conceivable.
  • the adhesive layers 12 are free of gas bubbles and, in the exemplary embodiment, consist of acrylate adhesive to which an absorber dye is added, with a thickness of 23 ⁇ m, preferred layer thicknesses being between 1 ⁇ m and 40 ⁇ m.
  • the data memory 1 contains twenty layers 10 of the polymer film 11 and has an outside diameter of approximately 30 mm. Its height is 19 mm. A different number of layers 10 or other dimensions are also possible.
  • the number of windings or layers 10 can be, for example, between ten and thirty, but can also be greater than thirty.
  • the read and write device 2 arranged in a recess in the central area of the core of the data memory 1 contains a read and write head 20 which can be rotated with the aid of a mechanism 21 in the directions of the arrows shown and moved axially back and forth.
  • the write and read head 20 has optical elements, with the aid of which a light beam (for example of the wavelength 630 nm or 532 nm) generated by a laser not shown in FIG. 1 can be focused on the individual layers 10 of the polymer film 11. Since the read and write head 20 is moved by means of the mechanism 21, it can completely scan all layers 10 of the data memory 1. In the exemplary embodiment, the data memory 1 is at rest.
  • FIG. 1 the elements provided for balancing the read and write head 20 are not shown.
  • the laser mentioned is located outside the read and write head 20 and is stationary; the laser beam is directed into the read and write head 20 via optical elements.
  • the laser in the exemplary embodiment is operated with a beam power of approximately 1 mW.
  • the laser beam serves as a write beam and is focused on a preselected layer 10 of the polymer film 11, so that the beam spot is less than 1 ⁇ m, the light energy being introduced in the form of short pulses of approximately 10 ⁇ s duration.
  • the energy of the write beam is absorbed in the beam spot, favored by the absorber in the adjacent adhesive layer 12, which leads to local heating of the polymer film 11 and thus to a local change in the refractive index and the reflectivity.
  • the laser In order to read stored information from the data memory 1, the laser is operated in continuous wave mode (CW mode). Depending on the stored information, the reading beam focused on the desired location is reflected, and the intensity of the reflected beam is detected by a detector in the writing and reading device 2.
  • CW mode continuous wave mode
  • the data memory can also be of an embodiment that is not writable by the user. In this case, it contains information units registered by the manufacturer. A write function in the data drive of the user is then unnecessary.
  • the information units are formed by changing the optical properties in a region with a preferred size of less than 1 ⁇ m.
  • the information can be stored in binary form, ie the local reflectivity only takes two values at the location of an information unit. This means that if the reflectivity is above a defined threshold value, a "1" is stored, for example, at the position of the information carrier under consideration, and if it is below this threshold value or below another, lower threshold value, correspondingly a "0". However, it is also conceivable to display the information in several gray levels. save. This is possible if the reflectivity of the polymer film can be changed in a targeted manner at the location of an information unit by a defined setting of the refractive index, without saturation being achieved in the process.
  • FIG. 2 shows a schematic cross section through the data memory from FIG. 1.
  • the core which is designated here by 30, is sleeve-shaped or hollow-cylindrical and has a cutout 32 in its central region.
  • the write and read device 2 of the drive can be received in the cutout 32, see FIG. 1.
  • the optical information carrier with the spiral wound Polymer film 11 and the adhesive layers 12 extend from the outer periphery 34 of the core 30 to an outer periphery 36.
  • the core 30 consists of polymethyl methacrylate (PMMA). It can be made by injection molding or extrusion. The surface of the core 30 delimiting the recess 32 is then preferably provided with an anti-scratch coating.
  • PMMA polymethyl methacrylate
  • Examples of other materials for the core are a cycloolefinic copolymer marketed by Nippon Zeon under the name “Zeonex” or other plastics. Glasses are particularly advantageous, e.g. the glass with the designation "BK7" from Schott.
  • the refractive index of the material for the core is matched to the refractive index of the polymer carrier.
  • biaxially oriented polypropylene has a refractive index of 1.503, while the refractive indices of polymethyl methacrylate are 1.491, "Zeonex" 1.522 and the glass "BK7" 1.515 , In all cases, the difference between the refractive indices is small.
  • the data memory the central area of which is shown in a schematic cross section in FIG. 3, has a core 40, the shape of which is somewhat different from that of the data memory explained with reference to FIGS. 1 and 2.
  • the core 40 has a cylindrical recess 41 for receiving a write and read device of a drive.
  • the outer contour 42 of the core 40 is not circular, as in FIG. 2, but is shaped like a spiral and has a step 43.
  • the height of the step 43 ie the size of the radial jump of the outer contour 42 at the step 43, is adapted to the thickness of the polymer film (including adjacent adhesive layer) designated here 44, which is wound onto the core 40.
  • FIG. 3 shows how the inner end 45 of the polymer film 44 (with an adhesive layer) is at the step 43.
  • the innermost layer 46 of the polymer film 44 lies against the outer contour 42 of the core 40 via the adhesive layer.
  • the step 43 ensures that the polymer film 44 largely runs on an ideal spiral, as can be seen from FIG.
  • an abrupt jump in the radial direction is prevented, as is the case with a core with a circular periphery, e.g. core 30, occurs when the polymer film hits the inner end at the beginning of the second turn, which marks the beginning of the first turn.
  • the inner windings of the spiral arrangement of the polymer film 44 have a more even course, so that the focus of a reading or writing beam can be better tracked.

Landscapes

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

Abstract

La présente invention concerne une mémoire de données comprenant un support d'informations optique présentant plusieurs couches (10) d'un support polymère (11) à travers lesquelles les informations d'une couche de support polymère prédéterminée (10) peuvent être lues et éventuellement être enregistrées dans une couche de support polymère prédéterminée (10). Le support d'information est formé autour d'un noyau optiquement transparent dont l'indice de réfraction diffère de moins de 0,08 de l'indice de réfraction du support polymère (11).
EP00956357A 1999-09-24 2000-07-31 Memoire de donnees Withdrawn EP1214710A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19947782 1999-09-24
DE19947782A DE19947782A1 (de) 1999-09-24 1999-09-24 Datenspeicher
PCT/EP2000/007379 WO2001024172A1 (fr) 1999-09-24 2000-07-31 Memoire de donnees

Publications (1)

Publication Number Publication Date
EP1214710A1 true EP1214710A1 (fr) 2002-06-19

Family

ID=7924459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00956357A Withdrawn EP1214710A1 (fr) 1999-09-24 2000-07-31 Memoire de donnees

Country Status (4)

Country Link
EP (1) EP1214710A1 (fr)
JP (1) JP2003510748A (fr)
DE (1) DE19947782A1 (fr)
WO (1) WO2001024172A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10029702A1 (de) * 2000-06-16 2002-01-03 Beiersdorf Ag Datenspeicher
DE10039372C2 (de) 2000-08-11 2003-05-15 Tesa Scribos Gmbh Holographischer Datenspeicher
DE102009021381A1 (de) 2009-05-14 2010-11-18 Tesa Se Optisch detektierbares Klebeband mit verminderten Glanzeigenschaften

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5580832A (en) * 1978-12-15 1980-06-18 Oki Electric Ind Co Ltd Wavelength multiple record/reproduction system
JPS6199981A (ja) * 1984-10-19 1986-05-19 Hitachi Ltd 光学式カセツトテ−プ
JPS61145746A (ja) * 1984-12-20 1986-07-03 Canon Inc 光記録再生媒体
JPS6280889A (ja) * 1985-10-04 1987-04-14 Toshiba Corp 光記録媒体の記録再生装置
EP0352194A1 (fr) * 1988-07-22 1990-01-24 Schlumberger Industries Méthodes, dispositif et milieu d'enregistrement d'information
JPH0354740A (ja) * 1989-07-24 1991-03-08 Matsushita Electric Ind Co Ltd 光学情報記録部材および光学情報記録再生装置
JP3547227B2 (ja) * 1995-08-24 2004-07-28 株式会社日立製作所 多層構造光情報媒体
US5631889A (en) * 1995-08-08 1997-05-20 Lewis; Ralph S. Optical storage apparatus with a focused mass storage medium
DE19650027A1 (de) * 1996-12-03 1998-06-04 Leesch Markus Data-Pin (Abkürzung DP)

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0124172A1 *

Also Published As

Publication number Publication date
DE19947782A1 (de) 2001-04-05
JP2003510748A (ja) 2003-03-18
WO2001024172A1 (fr) 2001-04-05

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