WO2001097216A1 - Datenspeicher - Google Patents
Datenspeicher Download PDFInfo
- Publication number
- WO2001097216A1 WO2001097216A1 PCT/EP2001/005930 EP0105930W WO0197216A1 WO 2001097216 A1 WO2001097216 A1 WO 2001097216A1 EP 0105930 W EP0105930 W EP 0105930W WO 0197216 A1 WO0197216 A1 WO 0197216A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polymer film
- layers
- data memory
- absorber
- layer
- Prior art date
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
- G11B7/003—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
-
- 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
Definitions
- the invention relates to a data memory with an optically writable and readable information carrier.
- a data memory with an optically writable and readable information carrier which has a polymer film, the refractive index of which can be changed locally by heating. If the polymer film is locally heated with the aid of a writing beam, the change in the refractive index results in a change in the reflectivity (reflectivity) at the point under consideration. This can be used to store information.
- a reading beam is used to read out the information, which is more strongly reflected by locations with increased reflectivity, which can be measured in order to record the information.
- the polymer film which consists for example of polypropylene (the material for the product sold by Beiersdorf AG under the name "tesafilm crystal clear”), can be pre-stretched in both surface directions during production, which means that a high level of energy is stored in the material , With a local ' warming through With such a configuration of the polymer film, the write beam undergoes a strong change in material (compression) by reshaping, the refractive index changing in the desired manner.
- an absorber for example a dye
- an absorber can be contained in an adhesion layer adjacent to the polymer film, which absorber preferably absorbs and emits the heat generated locally to the polymer film. With the aid of an absorber, a sufficiently large change in the refractive index (for example a change of approximately 0.2) can be achieved with a relatively low intensity of the write beam.
- the polymer film of the previously known data storage device is spirally wound in several layers (e.g. 10 to 30 layers) on a winding core, an adhesion layer being arranged between adjacent polymer film layers.
- an adhesion layer being arranged between adjacent polymer film layers.
- Claim 11 relates to a method for producing a data memory.
- the data memory according to the invention has an optical information carrier which has a polymer film (representing a polymer carrier), the refractive index of which can be changed locally by heating.
- the optical information carrier is wound onto a spool and is set up to be unwound from the spool in the area provided for reading and writing information.
- the data storage device is therefore handled for writing and reading in a manner similar to a magnetic tape, the section of the optical information carrier unwound from the spool preferably being wound up on a take-up spool.
- a read beam or a write beam from a drive matched to the data store only has to penetrate one data carrier layer (or, in a preferred embodiment, also several polymer film layers, but preferably a small number), since the area of the optical information carrier excludes which data is read out or written into the data is unwound from the spool. This area is passed through the read and write device of the data drive.
- the requirements for the tracking options and the focus of the read or write beam are therefore relatively low, which has a favorable effect on the costs of the drive.
- Another advantage of the data memory according to the invention is that in principle a larger or even much larger amount of data can be stored than in the conventional data memory described at the outset, since the length of the optical information carrier wound on the spool is almost unlimited.
- Polypropylene for example, is suitable as a polymer for the polymer film, but other materials are also conceivable.
- the polymer film is preferably stretched, and a biaxially stretched polymer film, for example biaxially oriented polypropylene (BOPP), is particularly suitable.
- the polymer film is biaxially stretched by being biased in its plane in two perpendicular directions during manufacture. This means that a high energy density is stored in the film material.
- a strong change in material for example, a material sealing
- the change in the refractive index in the region which is locally heated by a write beam is preferably of the order of magnitude of 0.2. This leads to a change in the local reflectivity, which can be easily detected with the aid of a reading beam.
- the polymer film is assigned an absorber which is set up to at least partially absorb a writing beam and to at least partially emit the heat generated thereby locally to the polymer film.
- the absorber can, for example, be contained in an absorber layer arranged on the polymer film or be integrated in the polymer film; Mixed forms are also conceivable.
- the absorber contains, for example, dye molecules which preferentially absorb at the light wavelength of the write beam used, and enables local heating of the polymer film which is sufficient to change the refractive index with a relatively low intensity of the write beam.
- An example of an absorber is Dispersrot 1 (DR1), an azo dye which is known from applications in nonlinear optics with dye-containing polymer films.
- Absorbers with higher temperature stability are, for example, anthraquinone or indanthrene dyes. Since the optical information Carrier preferably has only a single or a few data carrier layers, each of which an absorber can be assigned, the problem of a low transparency caused by the absorber and hindering the reading and writing process does not occur, which is a further advantage of the invention.
- the optical information carrier can have a plurality of polymer film layers, through which information can be written into a preselected polymer film layer or read out from a preselected polymer film layer.
- An adhesive layer is preferably arranged between adjacent polymer film layers in order to fix the polymer film layers together.
- the optical information carrier thus has a plurality of data carrier layers, each of which has a poly success layer.
- additional layers can also be provided, e.g. Absorber layers, (see above). With a thickness of the polymer film of a polymer film layer between 10 ⁇ m and 100 ⁇ m, the information can be displayed on different polymer film layers with the help of e.g.
- An adhesive layer can e.g. have a thickness in the range between 1 ⁇ m and 40 ⁇ m.
- a suitable adhesive is e.g. an air bubble-free acrylic adhesive, e.g. is crosslinked chemically or by UN or electron radiation.
- the refractive index of the adhesive layer preferably deviates only slightly from the refractive index of the adjacent polymer film layers in order to minimize disturbing reflections of the reading beam or the write beam at a boundary layer between the adhesive layer and a polymer film 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 greater the number of 'polymer film layers used, the greater the optical information carrier is at a given length, the memory capacity of the data memory. Conversely, if the storage capacity is specified, the length of the optical information carrier and thus the access time to the data storage device decrease as the number of polymer film layers increases, if specified data are to be read out.
- the adhesive layer can have an absorber of the type described above.
- an absorber layer is arranged between each of the adjacent polymer film layers, which is set up to at least partially absorb a write beam and to emit the heat generated in this way predominantly locally to that of the adjacent polymer film layers that is closest to the focus of the write beam.
- An adhesive layer can be set up as an absorber layer.
- the structure of the optical information carrier is particularly simple and inexpensive if a total of two polymer film layers are provided, which are separated by an absorber layer with adhesive properties, this absorber layer being thick enough to provide a predominant heat depending on the position of the focus of the write beam. allow dispensing in one or the other polymer olienlage.
- the information units are formed in the polymer film or the polymer film layers of the data memory according to the invention 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, i.e. local reflectivity only takes two values at the point of an information unit. That is, if the reflectivity lies above a defined threshold value, e.g. at the position of the optical information carrier under consideration stores a "1", and if it is below this threshold or below another, lower threshold, a "0" accordingly.
- a defined threshold value e.g. at the position of the optical information carrier under consideration stores a "1"
- the optical information carrier has a plurality of layers or layers
- at least two layers or layers are coextruded.
- Such layers or layers can e.g. one or more polymer film layers, one or more absorber layers or one or more adhesive layers. Because several layers or layers are produced in the process and preferably connected to one another in the process, the process can be carried out quickly and inexpensively.
- FIG. 1 shows a schematic representation of a data memory according to the invention in a drive that is matched to it
- Figure 2 is a schematic representation of an embodiment of a data storage device according to the invention, in which the optical information carrier has two layers of polymer film, in a drive and matched thereto
- Figure 3 is a schematic representation of an extruder head with which a polymer film and an absorber layer are co-extruded.
- FIG. 1 schematically illustrates an embodiment of a data memory 1 that is inserted into a drive with a read and write device 2.
- the data memory 1 has a tape-like optical information carrier 10 which is wound on a spool 12. In an area 14 opposite the writing and reading device 2, the optical information carrier 10 is unwound from the coil 12 and runs there in the exemplary embodiment essentially in a straight line. Behind it, the optical information carrier 10 is received by a take-up spool 16 and is wound up there.
- the data memory 1 is designed as a cassette into which the coil 12 and the take-up coil 16 are integrated. Via a control device of the drive, a forward and a reverse and possibly a fast forward and a fast return of the coil 12 and the take-up coil 16 can be effected in order to place a desired area 14 of the optical information carrier 10 with respect to the writing and reading device 2.
- the optical information carrier 10 has a polymer film to which an absorber layer is applied, for example similar to that explained below in connection with FIG. 3.
- the polymer film here consists of biaxially oriented polypropylene (BOPP) and has a thickness of 50 ⁇ m.
- the absorber layer contains an absorber dye which is embedded in an acrylic mass as a binder and has a layer thickness of 25 ⁇ m. Suitable absorber dyes are, for example, Disperse Red 1 (in particular for a green writing laser) or Rhodamine 800 (in particular for a red writing laser).
- the optical information carrier is 10 mm wide and has a length of 200 m. Other materials, compositions and dimensions are also possible.
- the write and read device 2 contains a read and write head which enables data to be written into or read from the optical information carrier 10 over the full width of the optical information carrier 10 (ie in a direction perpendicular to the paper plane in FIG Figure 1).
- the optical information carrier 10 is divided into tracks running in parallel, with data associated with only a given track being able to be processed at a given time.
- the read and write head has optical elements, with the aid of which a light beam (e.g. of the wavelength 680 nm, 630 n or 532 nm) generated by a laser not shown in FIG. 1 can be focused on the optical information carrier 10.
- a light beam of 680 nm can e.g. can be generated with an inexpensive red laser diode.
- 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 the optical information carrier 10 (preferably on the transition area between the polymer film and the absorber layer), so that the beam spot is less than about 1 ⁇ m.
- the light energy is 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, which leads to local heating of the polymer film and thus to a local change in the refractive index and the reflectivity, as explained above.
- the reflectivity decreases when heated by the write beam.
- Figure 1 are the points at which on the described manner, for example a logical "0" is written on the optical information carrier 10, identified by 18 and shown schematically in a greatly enlarged width.
- the laser In order to read stored information from the data memory 1, the laser is operated in the continuous wave mode (CW mode) in the exemplary embodiment. Depending on the stored information, the laser beam that is focused on the desired location and serves as a reading beam is reflected, and the intensity of the reflected beam is detected by a detector in the writing and reading device 2.
- the reading process is explained at a logical "0" (left) and at a logical "1" (right).
- the reading beam designated 20 strikes a location 18 of the optical information carrier 10 a relatively small proportion is reflected, as seen above; a weak reflex 22 is produced.
- a weak reflex 22 On the other hand, if the reading beam 20 meets the position of a logical "1", a larger proportion is reflected, so that a strong reflex 24 arises.
- 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.
- FIG. 2 shows, in a manner similar to FIG. 1, a data storage device 1 ', which is constructed similarly to the data storage device 1, the optical information carrier 10' of which, however. two layers to Has information storage.
- the data memory 1 ' has a coil 12' and a take-up coil 16 '.
- the area of the optical information carrier 10 'between the coil 12' and the take-up coil 16 ' is designated in FIG. 2 by 14'.
- the optical information carrier 10 ′ contains a first polymer film layer 30 and a second polymer film layer 32, both of which, in the exemplary embodiment, consist of biaxially oriented polypropylene with a thickness of 25 ⁇ m. Between the first polymer film layer 30 and the second polymer film layer 32 there is a 30 ⁇ m thick adhesive layer 34, via which the two polymer film layers 30 and 32 are flexibly glued to one another.
- the adhesion layer 34 contains an acrylic adhesive, to which an absorber dye is admixed.
- the writing and reading device of the drive is constructed similarly to that described in FIG. 1.
- both the write beam and the read beam can optionally be focused on the first polymer film layer 30 or the second polymer film layer 32 with the aid of an optical system.
- the first polymer film layer 30 is essentially locally heated, because the write beam 36 is in the region of second polymer film layer 32 and defocused in the adjoining region of the adhesive layer 34.
- only the first layer of polymer film 30 is e.g. a logical "0" is enrolled.
- the reading beam is focused accordingly in order to read out the information.
- FIG. 3 schematically illustrates how to produce an optical information carrier 10 "(similar to that of the 1) a polymer film is coextruded together with an absorber layer arranged on the polymer film.
- the extruder used for this has an extruder head 40 with two outlet openings, from which a polymer 42 (in the exemplary embodiment polypropylene) and an absorber 44 (see below) emerge at an elevated temperature. These two starting materials converge behind the extruder head 40 and form two layers during cooling, namely the polymer film denoted by 46 and the absorber layer denoted by 48.
- the polymer film 46 and the absorber layer 48 adhere to one another and form the optical information carrier 10. More specifically, the optical information carrier 10 or the starting material from which the optical information carrier 10 can be cut is produced by the extrudate being biaxially stretched 1 after the extrusion.
- the polymer film 46 becomes a film made of biaxially oriented polypropylene (BOPP), a material in which a high level of energy is stored (see above).
- BOPP biaxially oriented polypropylene
- the extruder head 40 has a temperature of 120-150 ° C.
- a mixture of 0.01-0.1% by weight of the absorber dye Sudan red B with an acrylate hotmelt mass serves as the binder, i.e. the absorber layer 48 contains the absorber dye Sudan red B, which is embedded in an acrylate binder.
- the extrudate is stretched 500% in the longitudinal direction (i.e., in the direction in which the polymer 42 and absorber 44 exit the extruder head 40) and in the transverse direction by 700%. After the biaxial stretching, the polymer film 46 has a thickness of 20-30 ⁇ m and the absorber layer 48 has a thickness of 10-20 ⁇ m, so that a total thickness of 30-50 ⁇ m results for the optical information carrier.
- the absorber is admixed with the polymer for the polymer film.
- the optical information carrier or its starting material is then extruded from the polymer containing the absorber as a unit made of polymer film and absorber.
- a mixture of polypropylene and 0.01-0.1% by weight of the absorber dye Sudan red B is extruded at a temperature of 120-150 ° C.
- the extrudate is then stretched biaxially, in the longitudinal direction (i.e. in the direction in which the mixture of polymer and absorber-dye emerges from the extruder head) by 500% and in the transverse direction by 700%.
- the resulting optical information carrier has a thickness of 30-50 ⁇ m and an optical density (see below) of approximately 0.3.
- the optical information carrier has several layers of polymer film, it is advantageous to extrude (coextrusion) the coherent unit made up of polymer film and absorber together with an adhesive layer (for example made of acrylate adhesive or lacquer) which does not contain any additive dye (coextrusion) a total thickness of e.g. Stretch 30-50 ⁇ m biaxially.
- the complete optical information carrier can then be built up with several such layer sequences.
- the absorber dye can also be introduced into the polymer film by a diffusion process.
- the polymer film can be placed in a solution which contains the absorber.
- the solvent should dissolve the absorber and on the other hand attack the polymer film to such an extent that it absorbs and swells the solution.
- the absorber molecules are distributed inside the polymer film.
- the polymer film is then removed from the solution and the solvent is evaporated.
- the polymer film essentially returns to its original dimensions, the absorber molecules remaining inside the polymer film.
- Another possibility for a diffusion process is that the absorber is first converted into the gas phase and the polymer film is exposed to a gas which contains the absorber.
- the absorber molecules diffuse into the interior of the polymer film, and some of the absorber molecules remain there as a result of absorption processes.
- the absorber Disperse Red 1 is suitable for a polymer film made of polypropylene.
- DRI is an azo dye that is known from applications in nonlinear optics with dye-containing polymer films. This absorber is preferably added to the polymer film via a diffusion process. If, on the other hand, the starting material for the optical information carrier is to be produced by extrusion in accordance with one of the methods explained above, where temperatures of around 200 ° C. can occur for polypropylene, absorbers with higher temperature stability, such as, for example, anthraquinone or indanthrene dyes, more suitable than DRl.
- PET polyethylene terephthalate
- the optical information carrier preferably contains the absorber in an amount or concentration such that an optical density in the range from 0.1 to 0.3 corresponds to a polymer film layer.
- the optical density is a measure of the absorption, here based on the light wavelength of a write beam. Depending on the application, the optical density can also be outside this range. In particular, if only one or two layers of polymer film are used, larger optical densities offer advantages.
- optical density is a parameter which is well suited for characterizing the absorption behavior.
- optical density D The following applies to the optical density D:
- T I / I 0 is the transmission through a layer of thickness d, the intensity of the incident radiation falling from I 0 to I, E is the extinction coefficient at the wavelength ⁇ used (concentration-independent substance parameter), and c is the concentration of the absorber in the layer.
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- Optical Record Carriers And Manufacture Thereof (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01934007A EP1290682A1 (de) | 2000-06-16 | 2001-05-23 | Datenspeicher |
JP2002511331A JP2004503894A (ja) | 2000-06-16 | 2001-05-23 | データメモリ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10029702A DE10029702A1 (de) | 2000-06-16 | 2000-06-16 | Datenspeicher |
DE10029702.1 | 2000-06-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001097216A1 true WO2001097216A1 (de) | 2001-12-20 |
Family
ID=7645968
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/005930 WO2001097216A1 (de) | 2000-06-16 | 2001-05-23 | Datenspeicher |
Country Status (5)
Country | Link |
---|---|
US (1) | US20030169674A1 (de) |
EP (1) | EP1290682A1 (de) |
JP (1) | JP2004503894A (de) |
DE (1) | DE10029702A1 (de) |
WO (1) | WO2001097216A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19932900C2 (de) | 1999-07-12 | 2003-04-03 | Tesa Ag | Datenspeicher, Verfahren zur Herstellung des Datenspeichers und Verwendung des Datenspeichers in einem Laufwerk |
DE19932902A1 (de) | 1999-07-12 | 2001-01-25 | Beiersdorf Ag | Datenspeicher |
DE10008328A1 (de) * | 2000-02-23 | 2002-01-31 | Tesa Ag | Datenspeicher |
DE10039372C2 (de) * | 2000-08-11 | 2003-05-15 | Tesa Scribos Gmbh | Holographischer Datenspeicher |
DE10039370A1 (de) * | 2000-08-11 | 2002-02-28 | Eml Europ Media Lab Gmbh | Holographischer Datenspeicher |
DE10128901A1 (de) * | 2001-06-15 | 2002-12-19 | Tesa Ag | Verfahren zum Eingeben von Information in einen optisch beschreibbaren und auslesbaren Datenspeicher |
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- 2001-05-23 US US10/311,246 patent/US20030169674A1/en not_active Abandoned
- 2001-05-23 WO PCT/EP2001/005930 patent/WO2001097216A1/de not_active Application Discontinuation
- 2001-05-23 EP EP01934007A patent/EP1290682A1/de not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
EP1290682A1 (de) | 2003-03-12 |
DE10029702A1 (de) | 2002-01-03 |
JP2004503894A (ja) | 2004-02-05 |
US20030169674A1 (en) | 2003-09-11 |
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