EP1264307A1 - Data memory - Google Patents

Data memory

Info

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Withdrawn
Application number
EP01923579A
Other languages
German (de)
French (fr)
Inventor
Bernhard MÜSSIG
Jörn LEIBER
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
Beiersdorf AG
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 Beiersdorf AG, Tesa Scribos GmbH filed Critical Beiersdorf AG
Publication of EP1264307A1 publication Critical patent/EP1264307A1/en
Withdrawn legal-status Critical Current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
    • G11B7/24—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.

Abstract

A data memory (1) has an optical information support which has a polymer film (11) that is wound into several layers (10) in a spiral shape. Information from a preselected layer (10) of the polymer film can be read out through said polymer film and optionally, written into a preselected layer of the polymer film (10). A lacquer layer (12) which is configured in the form of an adhesion layer is situated between adjacent polymer film layers (10).

Description

Datenspeicher data storage
Die Erfindung betrifft einen Datenspeicher mit einem optischen Informationsträger, der eine -in mehreren Lagen spiralartig gewickelte Polymerfolie aufweist, durch die hindurch Information aus einer, vorgewählten Polymer olienlage auslesbar und optional in eine vorgewählte Polymerfolienlage schreibbar ist.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.
In der DE 298 16 802 ist ein Datenspeicher mit einem optischen Informationsträger beschrieben, der eine Polymerfolie enthält. Als Material für die Polymerfolie werden Polymethylmethacrylat sowie ein von der Beiersdorf AG unter der Bezeichnung "tesafilm kristallklar" vertriebener Polymerfilm genannt, der biaxial orientiertes Polypropylen aufweist. Bei diesem Datenspeicher ist die Polymerfolie in mehreren Lagen spiralartig auf einen Wickelkern aufgewickelt, wobei sich zwischen benachbarten Lagen jeweils eine Adhäsionsschicht befindet. Die Adhäsionsschicht besteht aus einem druckempfindlichen Acrylatkleber. In den Datenspeicher lassen sich Informationen einschreiben, indem die Polymerfolie mit Hilfe eines Schreibstrahls eines Datenlaufwerks lokal erwärmt wird, wodurch sich die Brechzahl und damit das Reflexionsvermögen (Reflektivität) an der Grenzfläche der Polymerfolie lokal ändern. Dies kann mit Hilfe eines Lesestrahls in dem Datenlaufwerk erfaßt werden. Durch Pokussieren des Schreibstrahls oder des Lesestrahls läßt sich Information gezielt in eine vorgewählte Lage des Informationsträgers einschreiben bzw. daraus auslesen. Der Wickelkern kann optisch transparent sein und in seinem Zentrum eine Aussparung aufweisen, die zum Aufnehmen der Schreib- und Leseeinrichtung eines Datenlaufwerks dient. Dabei wird die Schreib- und Leseeinrichtung relativ zu dem Datenspeicher bewegt, während der Datenspeicher ruht, so daß der Datenspeicher nicht im Hinblick auf eine schnelle Rotationsbewegung ausgewuchtet zu sein braucht.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. In this data storage device, 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. This can be detected with the aid of a read beam in the data drive. By pokussing the write beam or the read beam, information can be specifically written into or read from a preselected position of the information carrier. 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.
Der bei dem vorbekannten Datenspeicher verwendete Acrylatkleber wird in Form einer wäßrigen Dispersion aufgetragen. Er ist nicht wasserunempfindlich. Ferner ist er nicht formstabil, so daß sich die einzelnen Lagen der Polymerfolie gegeneinander verschieben können ( "Teleskopiereffekt" ) oder im Laufe der Zeit sich sogar Dickenänderungen zwischen den einzelnen Lagen ergeben können. An den Rändern der aufgewickelten Polymerfolie kann es zu Ausquet- schungen von Klebemasse kommen. Weitere Nachteile sind Dickenschwankungen der Adhäsionsschicht sowie das Erfordernis einer generell recht großen Dicke für die Adhäsionsschicht. Zudem ist die Transparenz der Klebemasse aufgrund von Lösungsmittel- rückständen nicht perfekt.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.
Es ist Aufgabe der Erfindung, einen Datenspeicher mit einem optischen Informationsträger, der eine in mehreren Lagen spiralartig gewickelte Polymerfolie aufweist, zu schaffen-, bei dem die einzelnen Lagen der Polymerfolie formstabil und optisch einwandfrei miteinander verbunden sind.It is an object of the invention to provide a data storage medium with an optical information carrier which has a polymer film which is spirally wound in several layers, in which the individual layers of the polymer film are connected to one another in a dimensionally stable and optically perfect manner.
Diese Aufgabe wird gelöst durch einen Datenspeicher mit denThis task is solved by a data storage with the
Merkmalen des Anspruchs 1. Der Anspruch 13 gibt ein Verfahren zumFeatures of claim 1. Claim 13 specifies a method for
Herstellen eines derartigen Datenspeichers an. Der Anspruch 15 bezieht sich auf die Verwendung eines derartigen Datenspeichers in einem darauf abgestimmten Laufwerk. Vorteilhafte Ausgestaltungen der Erfindung folgen aus den abhängigen Ansprüchen.Manufacture of such a data store. The claim 15 relates to the use of such a data store in a matching drive. Advantageous embodiments of the invention follow from the dependent claims.
Der erfindungsgemäße Datenspeicher hat einen optischen Informa- tionsträger, der eine in mehreren Lagen spiralartig gewickelte Polymerfolie aufweist. Durch diese Lagen hindurch ist Information aus einer vorgewählten Polymerfolienlage auslesbar und optional in eine vorgewählte Polymerfolienlage schreibbar. Zwischen benachbarten Polymerfolienlagen ist eine als Adhäsionsschicht eingerichtete Lackschicht angeordnet. Vorzugsweise ist die Polymerfolie in mindestens fünf Lagen gewickelt.The data storage device according to the invention 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.
Eine als Adhäsionsschicht eingerichtete Lackschicht hat bessere mechanische und optische Eigenschaften als der bei dem vorbekann- ten Datenspeicher verwendete Acrylatkleber. Bei einer bevorzugten Ausführungsform ist der Lack der Lackschicht bei der Verarbeitung flüssig, lösungsmittelfrei (d.h. er bildet ein sogenanntes 100 %- System) und aushärtbar. Nach der Härtung ist die Lackschicht bzw. sind die Lackschichten des Datenspeichers formstabil, d.h. starr oder weitgehend starr, und fühlen sich nicht mehr klebrig an. Es können keine Lösungsmittelrückstände übrigbleiben, die zu einer Beeinträchtigung der Transparenz führen.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. In a preferred embodiment, 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.
Für den Lack der Lackschicht besonders geeignet sind trans- parente, polymerisierbare Harze, die vorzugsweise einen Radial- kalstarter enthalten, der zum Beispiel thermisch und/oder durchTransparent, 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
Ultraviolettstrahlung aktivierbar ist. Beispiele dafür sind oligo ere Acrylate oder oligo ere Methacrylate mit einem thermisch aktivierbaren Radikalstarter wie zum Beispiel Benzoyl- peroxid oder Azoisobuttersäurenitril (AIBN) oder einem durchUltraviolet 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
Ultraviolettstrahlung aktivierbaren Radikalstarter (zum BeispielRadical starters that can be activated by ultraviolet radiation (for example
"Irgacure 500" oder "Irgacure 1000", beides von der Fa. Ciba"Irgacure 500" or "Irgacure 1000", both from Ciba
Spezialitätenchemie vertriebene Marken) . Ebenso geeignet sind andere transparente, durch Radikalstarter polymerisierbare Harze. Auch transparente Harze, die sich durch kationische, durchBrands distributed by specialty chemicals). Other transparent resins which can be polymerized by radical initiators are also suitable. Also transparent resins, which are characterized by cationic, by
Ultraviolettstrahlung aktivierbare Starter polymerisieren lassen, wie zum Beispiel Epoxidharze oder Vinyletherha ze, kommen in Frage .Allow starters that can be activated to polymerize ultraviolet radiation, such as epoxy resins or vinyl ether resins are possible.
Bei einer bevorzugten Ausführungsform des erfindungsgemäßen Datenspeichers ist die Brechzahl der Polymerfolie lokal durch Erwärmung veränderbar. Als Material für die Polymerfolie kommt zum Beispiel biaxial orientiertes Polypropylen (BOPP) in Betracht. Wenn Polypropylen nach der Extrusion zur Folie in zwei Ebenen vorgespannt wird, wird im Material eine hohe Eigenenergie gespeichert. Bei einer lokalen Erwärmung, zum Beispiel durch einen Schreibstrahl, kommt es dann zu einer starken Materialänderung durch Rückverformung, und zwar bereits bei Deposition einer relativ geringen Energiemenge pro Flächeneinheit. Auf diese Weise läßt sich zum Beispiel eine Änderung der Brechzahl von etwa 0,2 über eine Fläche für eine gespeicherte Informationseinheit mit einem Durchmesser oder einer Seitenlänge von etwa 1 μm erzielen, was mit Hilfe eines Lesestrahls gut erfaßbar ist. Damit die Lackschicht gut an einer Polymerfolie aus Polypropylen haftet, kann eine Vorbehandlung der Polymerfolie erforderlich sein, zum Beispiel eine Corona-Behandlung. Andere Materialien als Polypropylen sind für die Polymerfolie ebenfalls denkbar.In a preferred embodiment of the data memory according to the invention, the refractive index of the polymer film can be changed locally by heating. Biaxially oriented polypropylene (BOPP), 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. In this way, for example, 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 μm can be achieved, which can be easily detected with the aid of a reading beam. In order for the lacquer layer to adhere well to a polymer film made of polypropylene, 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.
Der Polymerfolie kann ein Absorber zugeordnet sein, der dazu eingerichtet ist, einen Schreibstrahl zumindest teilweise zu absorbieren und die dabei erzeugte Wärme zumindest teilweise lokal an die Polymerfolie anzugeben. Der Absorber enthält zum Beispiel Farbstoffmoleküle, die in der Polymerfolie oder in einer zu der Polymerfolie benachbarten Schicht enthalten sind, und ermöglicht eine zur Veränderung der Brechzahl ausreichende lokale Erwärmung der Polymerfolie bei relativ geringer Intensität des Schreibstrahls. Als eine zu der Polymerfolie benachbarte Schicht, die den Absorber aufweisen kann, kommen die Lackschicht zwischen zwei benachbarten Lagen der Polymerfolie oder eine eigens für diesen Zweck vorgesehene Absorberschicht in Frage. Im letzteren Fall befindet sich zwischen benachbarten Polymerfolienlagen also nicht nur eine als Adhäsionsschicht eingerichtete Lackschicht, sondern zusätzlich eine Absorberschicht. (Bei weiteren Ausgestaltungen des Datenspeichers können zwischen benachbarten Polymerfolienlagen außer einer Lackschicht eine oder mehrere Schichten mit anderen oder zusätzlichen Funktionen angeordnet sein. )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. As a layer adjacent to the polymer film, which can have the absorber, 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.)
Vorzugsweise weicht die Brechzahl der Lackschiσht nur geringfügig von der Brechzahl der Polymerfolie ab, um störende Reflexionen eines Lesestrahls oder eines Schreibstrahls an einer Grenzschicht zwischen einer Polymerfolienlage und einer benachbarten Lack- schicht zu minimieren. Besonders vorteilhaft ist es, wenn der Unterschied der Brechzahlen kleiner als 0,005 ist. Ein bestehender Unterschied der Brechzahlen kann jedoch zum Formatieren des Datenspeichers genutzt werden.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.
Ein erfindungsgemäßer Datenspeicher mit spiralartig gewickelter Polymerfolie und aushärtbarem Lack der Lackschicht kann hergestellt werden, indem der Lack der Lackschicht auf mindestens eine Seite einer Polymerfolie aufgetragen wird und die Polymerfolie spiralartig gewickelt wird. Dabei wird der Lack der Lackschicht während des Wickeins und/oder nach Beendigung des Wickelvorgangs ausgehärtet. Vorzugsweise wird der Lack mit einem Rakel auf die Polymerfolie aufgetragen. Andere Methoden zum Auftragen des Lacks sind ebenfalls denkbar, zum Beispiel ein Aufsprühen oder ein Aufstreichen. Die Polymerfolie kann auf einen Wickelkern aufgewickelt werden, zum Beispiel einen transparenten Wickelkern, der hinterher am Datenspeicher verbleibt. Eine andere Möglichkeit besteht darin, die Polymerfolie auf einen Wickelkörper zu wickeln, der anschließend aus dem Zentralbereich des Datenspeichers herausgezogen wird. Es resultiert ein formstabiler Datenspeicher mit einer spiralartig gewickelten Polymerfolie, die sich nicht mehr abwickeln läßt und sich nicht teleskopartig verschiebt. Außerdem zeigt die Lackschicht zwischen benachbarten Polymerfolienlagen eine hohe Transparenz, was das Auslesen und gegebenenfalls Einschreiben von Daten in den Datenspeicher erleichtert. Wenn der Datenspeicher spiralartig gewickelt ist und in seinem Zentralbereich eine Aussparung aufweist, zum Beispiel in einem Wickelkern, ist es möglich, in dieser Aussparung eine L'ese- einrichtung und optional eine Schreibeinrichtung eines auf den Datenspeicher abgestimmten Laufwerks anzuordnen und zum Lesen bzw. zum Schreiben von Information relativ zu dem Datenspeicher zu bewegen, während der Datenspeicher ruht. Ein ruhender Datenspeicher hat den Vorteil, daß er nicht ausgewuchtet sein muß, um hohe Rotationsgeschwindigkeiten zu ermöglichen, was sich günstig auf die Herstellungskosten auswirkt.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. In addition, 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. If 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.
Im folgenden wird die Erfindung anhand von Ausführungsbeispielen näher beschrieben. Die Zeichnung zeigt inThe invention is described in more detail below with the aid of exemplary embodiments. The drawing shows in
Figur 1 einen Datenspeicher, der eine spiralartig gewickelte Polymerfolie aufweist, in schematischer perspektivischer Darstellung, wobei in einer Aussparung im Zentralbereich des Datenspeichers Teile eines auf den Datenspeicher abgestimmten Laufwerks angeordnet sind.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.
Figur 1 zeigt in schematischer Darstellung einen Datenspeicher 1 und eine Schreib- und Leseeinrichtung 2 eines auf den Datenspeicher 1 abgestimmten Laufwerks. Der Datenspeicher 1 weist eine Anzahl von Lagen 10 einer als Informationsträger dienenden Poly- merfolie 11 auf, die spiralartig auf einen optisch transparenten Wickelkern aufgewickelt ist. Der Wickelkern ist in Figur 1 der Übersichtlichkeit halber nicht dargestellt; er befindet sich innerhalb der innersten Lage 10. Zur besseren Veranschaulichung sind die einzelnen Lagen 10 der Polymerfolie 11 in Figur 1 als konzentrische Kreisringe gezeigt, obwohl die Lagen 10 durch spiralartiges Wickeln der Polymerfolie 11 ausgebildet sind. Zwischen benachbarten Lagen 10 der Polymerfolie 11 ist jeweils eine als Adhäsionsschicht dienende Lackschicht 12 angeordnet. Die einzelnen Lackschichten 12 hängen also alle zusammen und haben als Ganzes ebenso wie die Polymerfolie 11 einen spiralartigen Verlauf . Aus Gründen der Übersichtlichkeit sind die Lackschichten 12 in Figur 1 in nicht maßstäblich vergrößerter Dicke eingezeichnet.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. For the sake of clarity, the winding core is not shown in FIG. 1; it is located within the innermost layer 10. For better illustration, 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. For reasons of clarity, the layers of paint are 12 in Figure 1 in a not to scale enlarged thickness.
Im Ausführungsbeispiel besteht die Polymerfolie 11 aus biaxial orientiertem Polypropylen (BOPP) und wurde vor dem Wickeln in beiden Flächenrichtungen vorgespannt. Die Polymerfolie 11 hat im Ausführungsbeispiel eine Dicke von 35 um; andere Dicken im Bereich von 10 um bis 100 um oder auch außerhalb dieses Bereichs liegende Dicken sind ebenfalls denkbar. Die Lackschichten 12 sind gasblasenfrei und bestehen im Ausführungsbeispiel aus einem durch Ultraviolettstrahlung aushärtbarenMethacrylatlack (siehe unten) , dem ein Absorber-Farbstoff beigemischt ist, bei einer Dicke von 23 μm, wobei bevorzugte Schichtdicken zwischen 1 μm und 40 μm liegen. Im Ausführungsbeispiel enthält der Datenspeicher 1 zwan- zig Lagen 10 der Polymerfolie 11 und hat einen Außendurchmesser von etwa 30 mm. Seine Höhe beträgt 19 mm. Eine andere Anzahl von Lagen 10 oder andere Abmessungen sind ebenfalls möglich. Die Anzahl der Wicklungen oder Lagen 10 kann zum Beispiel zwischen zehn und dreißig liegen, aber auch größer als dreißig sein.In the exemplary embodiment, the polymer film 11 consists of biaxially oriented polypropylene (BOPP) and was pretensioned in both surface directions before winding. In the exemplary embodiment, the polymer film 11 has a thickness of 35 μm; 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 μm, with preferred layer thicknesses between 1 μm and 40 μm. In the exemplary embodiment, 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.
Die im Innenraum des Wickelkerns angeordnete Schreib- und Leseeinrichtung 2 ist im Prinzip z.B. aus der DVD-Technologie bekannt. Die Schreib- und Leseeinrichtung 2 enthält einen Schreibund Lesekopf 20, der mit Hilfe einer Mechanik 21 in den Richtun- gen der eingezeichneten Pfeile gedreht und axial hin- und herbewegt werden kann. Der Schreib- und Lesekopf 20 weist optische Elemente auf, mit deren Hilfe ein von einem in Figur 1 nicht dargestellten Laser erzeugter Lichtstrahl (zum Beispiel der Wellenlänge 630 nm oder 532 n ) auf die einzelnen Lagen 10 der Polymerfolie 11 fokussiert werden kann. Da der Schreib- und Lesekopf 20 mit Hilfe der Mechanik 21 bewegt wird, kann er alle Lagen 10 des Datenspeichers 1 vollständig abtasten. Im Ausführungsbeispiel ruht dabei der Datenspeicher 1. Er braucht also nicht im Hinblick auf eine hohe Rotationsgeschwindigkeit ausge- wuchtet zu sein (und muß auch nicht abgewickelt oder umgespult werden), im Gegensatz zu dem Schreib- und Lesekopf 20. Der Über- sichtlichkeit halber sind in Figur 1 die zum Auswuchten des Schreib- und Lesekopfs 20 vorgesehenen Elemente nicht gezeigt. Der erwähnte Laser befindet sich außerhalb des Schreib- und Lesekopfes 20 und ist stationär; der Laserstrahl wird über opti- sehe Elemente in den Schreib- und Lesekopf 20 gelenkt.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. 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. For the sake of clarity, 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.
Zum Speichern oder Einschreiben von Information in den Datenspeicher 1 wird der Laser im Ausführungsbeispiel mit einer Strahlleistung von etwa 1 mW betrieben. Der Laserstrahl dient dabei als Schreibstrahl und wird auf eine vorgewählte Lage 10 der Polymerfolie 11 fokussiert, so daß der Strahlfleck kleiner als 1 μm ist. Die Lichtenergie wird dabei in Form kurzer Pulse von etwa 10 μs Dauer eingebracht. Die Energie des Schreibstrahls wird in dem Strahlfleck absorbiert, begünstigt durch den Absorber in der benachbarten Lackschicht 12, was zu einer lokalen Erwärmung der Polymerfolie 11 und damit zu einer lokalen Änderung der Brechzahl und der Reflektivität führt. Beim Schreibvorgang ist der Schreibstrahl in den zu der betrachteten Lage 10 der Polymerfolie 11 benachbarten Lagen defokussiert, so daß die benach- harten Lagen der Polymerfolie 11 lokal nur geringfügig erwärmt werden und dort die gespeicherte Information nicht verändert wird.In order to store or write information into the data memory 1, 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 μm. The light energy is introduced in the form of short pulses of approximately 10 μs 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. During the writing process, 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.
Um gespeicherte Information aus dem Datenspeicher 1 auszulesen, wird der Laser im Aus ührungsbeispiel im Continuous-Wave-Modus (CW-Modus) betrieben. In Abhängigkeit von der gespeicherten Information wird der auf die gewünschte Stelle fokussierte Lesestrahl reflektiert, und die Intensität des reflektierten Strahls wird von einem Detektor in der Schreib- und Leseeinrichtung 2 erfaßt.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.
Der Datenspeicher kann auch von einer Ausführungsform sein, die vom Benutzer nicht beschreibbar ist. In diesem Fall enthält er vom Hersteller eingeschriebene Informationseinheiten. Eine Schreibfunktion im Datenlaufwerk des Benutzers erübrigt sich dann. In der Polymerfolie 11 sind die Informationseinheiten durch Änderung der optischen Eigenschaften in einem Bereich mit einer bevorzugten Größe von weniger als 1 μm ausgebildet. Dabei kann die Information binär gespeichert sein, d.h. die lokale Reflek- tivität nimmt an der Stelle einer Informationseinheit nur zwei Werte an. Das heißt, wenn die Reflektivität oberhalb eines festgelegten Schwellenwerts liegt, ist an der betrachteten Stelle des Informationsträgers z.B. eine "1" gespeichert, und wenn sie unterhalb dieses Schwellenwerts oder unterhalb eines anderen, niedrigeren Schwellenwerts liegt, entsprechend eine "0". Es ist aber auch denkbar, die Information in mehreren Graustufen abzuspeichern. Dies ist möglich, wenn sich die Reflektivität der Polymerfolie an der Stelle einer Informationseinheit durch definiertes Einstellen der Brechungzahl auf gezielte Weise verändern läßt, ohne daß dabei eine Sättigung erreicht wird.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. In the polymer film 11, the information units are formed by changing the optical properties in a region with a preferred size of less than 1 μm. 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.
Zum Herstellen des Datenspeichers 1 wird eine Polymerfolie 11 aus biaxial orientiertem Polypropylen verwendet, die zuvor einer beidseitigen Corona-Behandlung unterzogen worden ist, um die Hafteigenschaften für Lack zu verbessern. Die Polymerfolie 11 wird auf den oben erwähnten Wickelkern spiralartig aufgewickelt, indem der Wickelkern gedreht wird. Während des Wickel organgs wird auf eine Seite des noch nicht aufgewickelten Bereichs der Polymerfolie 11 mit Hilfe eines Rakels ein Lack gleichmäßig aufgetragen. Der Lack besteht im Ausführungsbeispiel aus oligomerem Methacrylat, dem soviel eines Absorber-Farbstoffs (hier Sudanrot 7B), daß sich pro Lage eine optische Dichte (siehe unten) von etwa 0,1 bis 0,3 ergibt, und 0,5 Gew.-% eines durch Ultraviolettstrahlung aktivierbaren RadikalStarters beigemischt sind. Im Ausführungsbeispiel ist der RadikalStarter ein Radikalstarter der Marke "Irgacure 500" oder "Irgacure 1000" von Ciba Spezialitätenchemie. Die Zone, wo sich der noch nicht aufgewickelte Bereich der Polymerfolie 11 an den bereits aufgewickelten Bereich anlegt, wird mit Ultraviolettlicht bestrahlt. Dadurch wird der Radikalstarter des Lacks aktiviert, so daß der Lack bereits während des Wickelvorgangs soweit aushärtet, daß sich die bereits aufgewickelten Polymerfolienlagen 10 nicht mehr gegeneinander verschieben können. Nach Beendigung des Wickelvorgangs wird der Datenspeicher 1 solange weiter mit Ultraviolettlicht bestrahlt, bis der Lack durchgehärtet ist.A polymer film 11 made of biaxially oriented polypropylene, which has previously been subjected to a double-sided corona treatment, is used to produce the data memory 1 in order to improve the adhesive properties for paint. The polymer film 11 is spirally wound on the above-mentioned winding core by rotating the winding core. During the winding process, 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. In the exemplary embodiment, 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. % of a radical starter that can be activated by ultraviolet radiation are added. In the exemplary embodiment, 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. After the winding process has ended, the data storage device 1 continues to be irradiated with ultraviolet light until the lacquer has hardened completely.
Weitere Beispiele für den Lack sind EpoxidharzSysteme, die den Starter bereits enthalten (z.B. der Marken "Vitraut 1558" oder "Vitraut 1505", Fa. Panacol-Elosol) , sowie UV-härtende Acrylatkleber (z.B. der Marken "Vitralit 1810", "Vitraut 5638" oder "Vitralit 7104", Fa. Panacol-Elosol, oder der Marke "302", Fa. Loctite; diese vier Produkte enthalten ebenfalls bereits den Starter) .Other examples of the lacquer are 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).
Ein Absorber-Farbstoff kann auch in der Polymerfolie enthalten sein. Bei einer anderen Ausgestaltung ist zusätzlich zu der Polymerfolie 11 und den Lackschichten 12 eine eigene Schicht mit Absorber-Farbstoff vorgesehen. In diesem Fall ist es zweckmäßig, zunächst die Schicht mit Absorber-Farbstoff auf eine Seite der Polymerfolie 11 aufzutragen und anschließend die mit dieser Absorberschicht versehene Polymerfolie 11 unter Hinzufügung von Lack aufzuwickeln, wie zuvor beschrieben.An absorber dye can also be contained in the polymer film. In another embodiment, 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.
Die optische Dichte ist bei der Absorption das Produkt aus der Absorptionskonstanten (die von der Konzentration eines Absorbe - Farbstoffs abhängt) und der durchstrahlten Schiσhtdicke und ist eine zur Charakterisierung des Absorptionsverhaltens gut geeignete Größe. Vorzugsweise liegt die optische Dichte bei der Lichtwellenlänge eines Schreibstrahls im Bereich von 0,1 bis 0,3 pro Lage (Polymerfolie plus Lackschicht plus evtl. zusätzliche Schichten wie z.B. Schicht mit Absorber-Farbstoff), kann aber auch kleiner oder größer sein. During absorption, 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.

Claims

Patentansprüche claims
1. Datenspeicher, mit einem optischen Informationsträger, der eine in mehreren Lagen (10) spiralartig gewickelte Polymer- folie (11) aufweist, durch die hindurch Information aus einer vorgewählten Polymerfolienlage (10) auslesbar und optional in eine vorgewählte Polymerfolienlage (10) schreibbar ist, wobei zwischen benachbarten Polymerfolienlagen (10) eine als Adhäsionsschicht eingerichtete Lackschicht (12) angeordnet ist.1. Data storage device with an optical information carrier which has a polymer film (11) wound in several layers (10) in a spiral manner, through which information can be read from a preselected polymer film layer (10) and optionally written into a preselected polymer film layer (10) A lacquer layer (12) set up as an adhesion layer is arranged between adjacent polymer film layers (10).
2. Datenspeicher nach Anspruch 1, dadurch gekennzeichnet, daß die Polymerfolie (11) in mindestens fünf Polymerfolienlagen (10) gewickelt ist.2. Data memory according to claim 1, characterized in that the polymer film (11) is wound in at least five polymer film layers (10).
3. Datenspeicher nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Polymerfolie (11) auf einen Wickelkern aufgewickelt ist.3. Data memory according to claim 1 or 2, characterized in that the polymer film (11) is wound on a winding core.
4. Datenspeicher nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Brechzahl der Polymerfolie (11) lokal durch Erwärmung veränderbar ist.4. Data memory according to one of claims 1 to 3, characterized in that the refractive index of the polymer film (11) can be changed locally by heating.
5. Datenspeicher nach Anspruch 4, dadurch gekennzeichnet, daß der Polymerfolie (11) ein Absorber zugeordnet ist, der dazu eingerichtet ist, einen Schreibstrahl zumindest teilweise zu absorbieren und die dabei erzeugte Wärme zumindest teilweise lokal an die Polymerfolie (11) abzugeben.5. Data memory according to claim 4, characterized in that the polymer film (11) is associated with an absorber which is set up to at least partially absorb a write beam and at least partially emit the heat generated thereby locally to the polymer film (11).
6. Datenspeicher nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Brechzahl der Lackschicht (12) nur geringfügig von der Brechzahl der Polymerfolie (11) abweicht. 6. Data memory according to one of claims 1 to 5, characterized in that the refractive index of the lacquer layer (12) differs only slightly from the refractive index of the polymer film (11).
7. Datenspeicher nach einem der Ansprüche 1 bis 6 , dadurch gekennzeichnet, daß der Lack der Lackschicht (12) lösungsmittelfrei ist.7. Data memory according to one of claims 1 to 6, characterized in that the lacquer of the lacquer layer (12) is solvent-free.
8. Datenspeicher nach Anspruch 7, dadurch gekennzeichnet, daß der Lack der Lackschicht (12) aushärtbar ist.8. Data memory according to claim 7, characterized in that the lacquer of the lacquer layer (12) is curable.
9. Datenspeicher nach Anspruch 8, dadurch gekennzeichnet, daß der Lack der Lackschicht (12) ein transparentes, polymeri- sierbares Harz aufweist.9. Data memory according to claim 8, characterized in that the lacquer of the lacquer layer (12) has a transparent, polymerizable resin.
10. Datenspeicher nach Anspruch '9, dadurch gekennzeichnet, daß der Lack der Lackschicht (12) mindestens einen der aus der folgenden Gruppe ausgewählten Bestandteile aufweist: oligo- mere Acrylate, oligomere Methacrylate, Epoxidharze, Vinyl- etherharze.10. Data memory according to claim '9, characterized in that the lacquer of the lacquer layer (12) has at least one of the components selected from the following group: oligomeric acrylates, oligomeric methacrylates, epoxy resins, vinyl ether resins.
11. Datenspeicher nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß der Lack der Lackschicht (12) einen RadikalStarter enthält.11. Data memory according to claim 9 or 10, characterized in that the lacquer of the lacquer layer (12) contains a radical starter.
12. Datenspeicher nach Anspruch 11, dadurch gekennzeichnet, daß der RadikalStarter thermisch und/oder durch Ultraviolettstrahlung aktivierbar ist.12. Data memory according to claim 11, characterized in that the radical starter can be activated thermally and / or by ultraviolet radiation.
13. Verfahren zum Herstellen eines Datenspeichers mit den Merkmalen des Anspruchs 8, wobei der Lack der Lackschicht (12) auf mindestens eine Seite einer Polymerfolie (11) aufgetragen, die Polymerfolie (11) spiralartig gewickelt und der Lack der Lackschicht (12) während des Wickeins und/oder nach Beendigung des Wickelvorgangs ausgehärtet wird.13. A method for producing a data storage medium with the features of claim 8, wherein the lacquer of the lacquer layer (12) is applied to at least one side of a polymer film (11), the polymer film (11) is wound in a spiral manner and the lacquer of the lacquer layer (12) during the Wickeins and / or after the winding process is cured.
14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, daß der Lack mit einem Rakel aufgetragen wird. 14. The method according to claim 13, characterized in that the lacquer is applied with a doctor blade.
5. Verwendung eines Datenspeichers nach Anspruch 1, der in seinem Zentralbereich eine Aussparung aufweist, in einem darauf abgestimmten Laufwerk, das eine Leseeinrichtung (2) und optional eine Schreibeinrichtung (2) aufweist, wobei die Leseeinrichtung ( 2 ) und die optionale Schreibeinrichtung ( 2 ) in der Aussparung im Zentralbereich des Datenspeichers (1) angeordnet sind und zum Lesen bzw. Schreiben von Information relativ zu dem Datenspeicher (1) bewegt werden, während der Datenspeicher ( 1 ) ruht. 5. Use of a data memory according to claim 1, which has a cutout in its central area, in a drive which is matched to it and has a reading device (2) and optionally a writing device (2), the reading device (2) and the optional writing device (2 ) are arranged in the recess in the central area of the data memory (1) and are moved relative to the data memory (1) for reading or writing information while the data memory (1) is at rest.
EP01923579A 2000-02-23 2001-02-15 Data memory Withdrawn EP1264307A1 (en)

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DE10008328 2000-02-23
DE10008328A DE10008328A1 (en) 2000-02-23 2000-02-23 Data memory used for storing data has a lacquer layer arranged as an adhesion layer between neighboring polymer film layers
PCT/EP2001/001710 WO2001063604A1 (en) 2000-02-23 2001-02-15 Data memory

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