EP1264307A1 - Datenspeicher - Google Patents
DatenspeicherInfo
- Publication number
- EP1264307A1 EP1264307A1 EP01923579A EP01923579A EP1264307A1 EP 1264307 A1 EP1264307 A1 EP 1264307A1 EP 01923579 A EP01923579 A EP 01923579A EP 01923579 A EP01923579 A EP 01923579A EP 1264307 A1 EP1264307 A1 EP 1264307A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- polymer film
- data memory
- lacquer
- layer
- memory according
- 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- Withdrawn
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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/256—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers improving adhesion between layers
-
- 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
- G11B7/24—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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
- G11B7/245—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing a polymeric component
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
- G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
Definitions
- the invention relates to a data storage device with an optical information carrier which has a polymer film which is wound in several layers in a spiral manner and through which information can be read out from a preselected polymer film layer and optionally written into a preselected polymer film layer.
- DE 298 16 802 describes a data storage device with an optical information carrier which contains a polymer film.
- Polymethyl methacrylate and a polymer film sold by Beiersdorf AG under the name “tesafilm crystal clear", which has biaxially oriented polypropylene, are mentioned as the material for the polymer film.
- the polymer film is spirally wound in several layers on a winding core, an adhesive layer being located between adjacent layers.
- the adhesive layer consists of a pressure sensitive acrylic adhesive.
- Information can be written into the 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 reflectivity (reflectivity) at the interface of the Change polymer film locally.
- the winding core can be optically transparent and have a cutout in its center, 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 acrylate adhesive used in the previously known data storage medium is applied in the form of an aqueous dispersion. It is not insensitive to water. Furthermore, it is not dimensionally stable, so that the individual layers of the polymer film can shift relative to one another (“telescoping effect”) or even changes in thickness between the individual layers can occur over time. Adhesive may be squeezed out at the edges of the wound polymer film. Further disadvantages are fluctuations in the thickness of the adhesive layer and the requirement for a generally quite large thickness for the adhesive layer. In addition, the transparency of the adhesive is not perfect due to solvent residues.
- Claim 13 specifies a method for
- the data storage device has an optical information carrier which has a polymer film which is wound in several layers in a spiral manner. Through these layers, information can be read out from a preselected polymer film layer and optionally written into a preselected polymer film layer.
- a lacquer layer set up as an adhesion layer is arranged between adjacent polymer film layers.
- the polymer film is preferably wound in at least five layers.
- a lacquer layer set up as an adhesion layer has better mechanical and optical properties than the acrylate adhesive used in the previously known data storage medium.
- the lacquer of the lacquer layer is liquid, solvent-free (i.e. it forms a so-called 100% system) and hardenable during processing. After curing, the lacquer layer or the lacquer layers of the data storage device are dimensionally stable, i.e. rigid or largely rigid, and no longer feel sticky. There can be no solvent residues left which lead to an impairment of the transparency.
- Transparent, polymerizable resins which preferably contain a radial cold starter, which, for example, thermally and / or through, are particularly suitable for the lacquer of the lacquer layer
- Ultraviolet radiation can be activated.
- examples of these are oligomeric acrylates or oligomeric methacrylates with a thermally activatable radical initiator such as, for example, benzoyl peroxide or azoisobutyronitrile (AIBN) or a
- Radical starters that can be activated by ultraviolet radiation (for example
- transparent resins which can be polymerized by radical initiators are also suitable. Also transparent resins, which are characterized by cationic, by
- Allow starters that can be activated to polymerize ultraviolet radiation, such as epoxy resins or vinyl ether resins are possible.
- the refractive index of the polymer film can be changed locally by heating.
- Biaxially oriented polypropylene for example, can be used as the material for the polymer film. 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.
- a change in the refractive index of approximately 0.2 over an area for a stored information unit with a diameter or a side length of approximately 1 ⁇ m can be achieved, which can be easily detected with the aid of a reading beam.
- a pretreatment of the polymer film may be necessary, for example a corona treatment. Materials other than polypropylene are also conceivable for the polymer film.
- the polymer film can be assigned an absorber which is set up to at least partially absorb a write beam and to at least partially indicate the heat generated thereby locally to the polymer film.
- the absorber contains, for example, dye molecules, which are contained in the polymer film or in a layer adjacent to the polymer film, and enables sufficient local heating of the polymer film to change the refractive index with a relatively low intensity of the writing beam.
- the lacquer layer between two adjacent layers of the polymer film or an absorber layer provided specifically for this purpose can be considered. In the latter case, there is not only one lacquer layer set up as an adhesion layer between adjacent polymer film layers, but also an absorber layer. (In further configurations of the data memory, one or more layers with different or additional functions can be arranged between adjacent polymer film layers in addition to a lacquer layer.)
- the refractive index of the lacquer layer preferably deviates only slightly from the refractive index of the polymer film in order to minimize disruptive reflections from a reading beam or a write beam at a boundary layer between a layer of polymer film and an adjacent layer of lacquer. 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.
- a data memory according to the invention with a spirally wound polymer film and a curable lacquer of the lacquer layer can be produced by applying the lacquer of the lacquer layer to at least one side of a polymer film and winding the polymer film in a spiral.
- the lacquer of the lacquer layer is cured during winding and / or after the winding process has ended.
- the lacquer is preferably applied to the polymer film using a doctor blade. Other methods of applying the lacquer are also conceivable, for example spraying on or brushing on.
- the polymer film can be wound onto a winding core, for example a transparent winding core, which remains on the data storage device afterwards.
- Another possibility is to wind the polymer film on a winding body, which is then pulled out of the central area of the data memory.
- the result is a dimensionally stable data storage device with a spiral-wound polymer film which can no longer be unwound and does not move telescopically.
- the lacquer layer between adjacent polymer film layers shows a high level of transparency, which makes it easier to read out and, if necessary, write data into the data memory.
- the data storage device is wound spirally and has a recess in its central area, for example in a winding core, it is possible to arrange a reading device and optionally a writing device of a drive matched to the data storage device in this recess and for reading or reading Writing information to move relative to the data store while the data store is at rest.
- a stationary data storage device has the advantage that it does not have to be balanced in order to enable high rotational speeds, which has a favorable effect on the production costs.
- FIG. 1 shows a data storage device which has a spiral-wound polymer film, in a schematic perspective illustration, parts of a drive which is matched to the data storage device being arranged in a cutout in the central region of the data storage device.
- FIG. 1 shows a schematic representation of a data store 1 and a write and read device 2 of a drive matched to the data store 1.
- the data memory 1 has a number of layers 10 of a polymer film 11 which serves as an information carrier and which is wound spirally on an optically transparent winding core.
- the winding core is not shown in FIG. 1; it is located within the innermost layer 10.
- 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-like winding of the polymer film 11.
- a lacquer layer 12 serving as an adhesive layer is arranged between adjacent layers 10 of the polymer film 11. The individual lacquer layers 12 are therefore all connected and, as a whole, like the polymer film 11, have a spiral course.
- the layers of paint are 12 in Figure 1 in a not to scale enlarged thickness.
- the polymer film 11 consists of biaxially oriented polypropylene (BOPP) and was pretensioned in both surface directions before winding.
- the polymer film 11 has a thickness of 35 ⁇ m; other thicknesses in the range from 10 .mu.m to 100 .mu.m or thicknesses outside this range are also conceivable.
- the lacquer layers 12 are free of gas bubbles and, in the exemplary embodiment, consist of a methacrylate lacquer which can be hardened by ultraviolet radiation (see below) and to which an absorber dye is added, with a thickness of 23 ⁇ m, with preferred layer thicknesses between 1 ⁇ m and 40 ⁇ m.
- the data memory 1 contains twenty layers 10 of the polymer film 11 and has an outer 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 writing and reading device 2 arranged in the interior of the winding core is known in principle, for example, from DVD technology.
- the writing and reading device 2 contains a writing and reading 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 n) 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.
- the read and write head 20 It therefore does not need to be balanced with regard to a high rotational speed (and also does not have to be unwound or rewound), in contrast to the read and write head 20.
- the elements provided for balancing the read and write head 20 are not shown in FIG.
- 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 writing 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 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 in the adjacent lacquer 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 write beam is defocused in the layers adjacent to the layer 10 of the polymer film 11 under consideration, so that the adjacent layers of the polymer film 11 are locally heated only slightly and the stored information is not changed there.
- the laser In order to read stored information from the data memory 1, the laser is operated in the exemplary embodiment in the 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 save the information in several gray levels. 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.
- the polymer film 11 is spirally wound on the above-mentioned winding core by rotating the winding core.
- a lacquer is applied uniformly to one side of the area of the polymer film 11 which has not yet been wound up with the aid of a doctor blade.
- the lacquer consists of oligomeric methacrylate, the amount of an absorber dye (here Sudan red 7B) that there is an optical density (see below) of about 0.1 to 0.3 per layer, and 0.5% by weight.
- the radical starter is a radical starter of the "Irgacure 500" or "Irgacure 1000" brand from Ciba Specialty Chemicals.
- the zone where the area of the polymer film 11 which has not yet wound up lies against the area which has already been wound up is irradiated with ultraviolet light. This activates the radical starter of the lacquer, so that the lacquer cures to the extent that the polymer film layers 10 that have already been wound can no longer be shifted against one another.
- the data storage device 1 continues to be irradiated with ultraviolet light until the lacquer has hardened completely.
- lacquer examples include epoxy resin systems that already contain the starter (e.g. from the brands “Vitraut 1558” or “Vitraut 1505", from Panacol-Elosol), and UV-curing acrylic adhesive (eg from the brands “Vitralit 1810", “Vitraut 5638 “or” Vitralit 7104 ", from Panacol-Elosol, or the brand” 302 ", from Loctite; these four products also already contain the starter).
- starter e.g. from the brands “Vitraut 1558” or “Vitraut 1505", from Panacol-Elosol
- UV-curing acrylic adhesive eg from the brands “Vitralit 1810", “Vitraut 5638 “or” Vitralit 7104 ", from Panacol-Elosol, or the brand” 302 ", from Loctite; these four products also already contain the starter.
- An absorber dye can also be contained in the polymer film.
- a separate layer with absorber dye is provided in addition to the polymer film 11 and the lacquer layers 12. In this case, it is expedient to first apply the layer with absorber dye to one side of the polymer film 11 and then to wind the polymer film 11 provided with this absorber layer with the addition of lacquer, as previously described.
- the optical density is the product of the absorption constant (which depends on the concentration of an absorber dye) and the irradiated layer thickness and is a variable which is well suited for characterizing the absorption behavior.
- the optical density at the light wavelength of a write beam is preferably in the range from 0.1 to 0.3 per layer (polymer film plus lacquer layer plus possibly additional layers such as a layer with absorber dye), but can also be smaller or larger.
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
- Optical Recording Or Reproduction (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10008328 | 2000-02-23 | ||
DE10008328A DE10008328A1 (de) | 2000-02-23 | 2000-02-23 | Datenspeicher |
PCT/EP2001/001710 WO2001063604A1 (de) | 2000-02-23 | 2001-02-15 | Datenspeicher |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1264307A1 true EP1264307A1 (de) | 2002-12-11 |
Family
ID=7632027
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01923579A Withdrawn EP1264307A1 (de) | 2000-02-23 | 2001-02-15 | Datenspeicher |
Country Status (5)
Country | Link |
---|---|
US (1) | US20030142619A1 (de) |
EP (1) | EP1264307A1 (de) |
JP (1) | JP2004500678A (de) |
DE (1) | DE10008328A1 (de) |
WO (1) | WO2001063604A1 (de) |
Families Citing this family (9)
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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 |
DE10029702A1 (de) * | 2000-06-16 | 2002-01-03 | Beiersdorf Ag | Datenspeicher |
DE10039374A1 (de) * | 2000-08-11 | 2002-02-21 | Eml Europ Media Lab Gmbh | Holographischer 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 |
DE10128902A1 (de) * | 2001-06-15 | 2003-10-16 | Tesa Scribos 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 |
FR3073634B1 (fr) | 2017-11-10 | 2019-11-15 | Digifilm Corporation | Imageur electronique |
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2001
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- 2001-02-15 US US10/257,866 patent/US20030142619A1/en not_active Abandoned
- 2001-02-15 EP EP01923579A patent/EP1264307A1/de not_active Withdrawn
- 2001-02-15 WO PCT/EP2001/001710 patent/WO2001063604A1/de not_active Application Discontinuation
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Title |
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See references of WO0163604A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2004500678A (ja) | 2004-01-08 |
WO2001063604A1 (de) | 2001-08-30 |
DE10008328A1 (de) | 2002-01-31 |
US20030142619A1 (en) | 2003-07-31 |
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