WO2007112710A1 - Procédé de fabrication d'un corps à plusieurs couches et en particulier d'un support optique de données - Google Patents

Procédé de fabrication d'un corps à plusieurs couches et en particulier d'un support optique de données Download PDF

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Publication number
WO2007112710A1
WO2007112710A1 PCT/DE2007/000144 DE2007000144W WO2007112710A1 WO 2007112710 A1 WO2007112710 A1 WO 2007112710A1 DE 2007000144 W DE2007000144 W DE 2007000144W WO 2007112710 A1 WO2007112710 A1 WO 2007112710A1
Authority
WO
WIPO (PCT)
Prior art keywords
metal layer
moisture
layer
dvd
plastic
Prior art date
Application number
PCT/DE2007/000144
Other languages
German (de)
English (en)
Inventor
Markus Schnieder
Original Assignee
Sonopress 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 Sonopress Gmbh filed Critical Sonopress Gmbh
Priority to DE112007001358T priority Critical patent/DE112007001358A5/de
Publication of WO2007112710A1 publication Critical patent/WO2007112710A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • 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
    • 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
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording 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
    • G11B7/252—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
    • G11B7/253—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 substrates
    • G11B7/2533—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 substrates comprising resins
    • G11B7/2534—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 substrates comprising resins polycarbonates [PC]
    • 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
    • G11B7/258—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 reflective layers

Definitions

  • the invention relates to a method for producing a multilayer body, in particular an optical data carrier, in which a layer of moisture-absorbing plastic directly, d. H. directly on the plastic layer, or indirectly, d. H. with at least one intermediate layer of other material such as a paint, covered with a metal layer.
  • the invention relates to a multilayered body comprising a layer of moisture-absorbing plastic, which is covered directly or indirectly with a metal layer, and a method for producing moisture-permeable diffusion bridges in a metal layer.
  • Thin metal layers or metallizations of workpieces, materials and surfaces are known for a variety of applications in various technical fields.
  • An important field of application, in which the reflective properties of metal layers are used, is the production of optical data carriers such.
  • a CD usually consists of a plastic disc into which a data structure in the form of microstructures is introduced on one side.
  • the structure is provided with a reflection layer by means of a metallization.
  • the CD thus has a plastic surface on one side, the "reading side” from which the information can be read out with the help of the laser, while on the other side, the "non-reading side", the CD points on the plastic disc a metal layer, which may be additionally provided with a protective lacquer and possibly with a print.
  • Polycarbonate is predominantly used as the plastic for CDs and other optical data carriers according to the prior art. Polycarbonate tends However, to absorb moisture and thus to an increase in volume. Since a CD is constructed asymmetrically as described, d, h. metallization only on one side and the polycarbonate disc on the other side is not covered with a metal layer, it expands unevenly due to the increase in volume of the polycarbonate, which inevitably leads to a certain angular tilting of the laser.
  • This angular tilting is also commonly referred to as "radial tilt.”
  • optical disk operation requires that the laser beam used for readout be reflected by the metallization without significant angular tilting
  • the effect mentioned above was taken into account so that the radial TiIt caused by the moisture absorption in the polycarbonate is generally not a problem.
  • a DVD is produced symmetrically from two polycarbonate disks, also referred to below as "half-sides.” These half-sides are each provided on one side with a nanostructure which forms the data structure and which is read by the reflection of a laser beam Nanostructures of the half sides are provided, as in the case of a CD, with a metal layer which allows reflection of the laser beam and without whose flawless reflection behavior a reliable function of the DVD is not guaranteed Therefore, the metal layers covering the nanostructures lie inside the data carrier, so DVDs have a polycarbonate layer on both sides and thus present a symmetrical structure By design, the DVD can absorb moisture from both sides. The.
  • the DVDs are because of the finer data structures met much stricter specifications without further ado.
  • a security feature is a hologram applied to a CD on the non-read side. This will be on the.
  • Metallization of the microstructure of the data layer applied a special paint in which the surface structure of the hologram is molded by means of an embossing die.
  • embossing die In order to visualize a thus produced embossed hologram for the human eye, the created hologram structure is metallised. The applied metallization is protected in a further step from the weather and mechanical damage by the application of a protective lacquer layer. The properties of the CD with respect to the influence of moisture are not significantly affected thereby.
  • Some embodiments of the DVD allow reading from one side of the DVD. If you want to implement such a security feature on such a DVD, the following problem arises. If you bring a full-surface hologram on the non-read side of the DVD, this no longer has, the normally provided symmetrical structure, but it results in an asymmetry. The side facing away from the read polycarbonate disc then has namely a metallization on both the inner and on the outer side. This results in an almost complete moisture barrier to the environment for this half page. On the other hand, the half side facing the reading side can absorb moisture on the reading side.
  • a DVD with a full-surface hologram on the non-read side receives a positive radial TiIt with increasing air humidity and thus no longer complies with the strict DVD specifications.
  • To produce a DVD with a full-surface hologram on the non-read side it is therefore necessary to minimize the behavior of the data carriers with respect to the radial deformation under climatic changes, in particular by changes in the humidities, in order to meet the narrow tolerances of the production specifications.
  • Another approach also pursues the strategy of preventing the moisture absorption of the half side on the readout side.
  • different coatings are used to equip the reading side with a moisture barrier.
  • special varnishes are used, which are applied in an additional process step.
  • These layers have a vitreous behavior.
  • they adversely affect the robustness of the manufacturing process negatively. This leads to higher scrap rates and not insignificantly increased production costs due to the additional material and technology costs.
  • moisture-permeable diffusion bridges are simply introduced into the metal layer.
  • the said layer of moisture-absorbing plastic of an inventive. multi-layered body is then covered with a metal layer, which, however, is permeable to moisture. Therefore, even on the side covered with the metal layer, the plastic layer can absorb and release moisture unhindered, just like on a side not covered by a metal layer.
  • the invention is therefore particularly interesting for the production of multilayer optical data carriers, in particular DVDs.
  • the invention can also be used in other applications in which moisture-absorbing plastic layers must be metallized and similar problems as in the DVD production occur.
  • the invention can also be used with CDs.
  • the diffusion bridges are advantageously designed so that the visual appearance of the metal layer is not changed by the diffusion bridges. Ie. the diffusion bridges should not be visible to a viewer with the naked eye.
  • the metal layer is therefore preferably produced and / or aftertreated in such a way that it has a microperforation as diffusion bridge at least in regions.
  • Such a microperforation according to the invention is when there are very small openings or holes in the metal layer with dimensions in the ⁇ m or sub- ⁇ m range, i. with dimensions of a few ⁇ m or even below, for example between 10 ⁇ m and 0.5 ⁇ m.
  • the spacing of the holes in the areas provided with the microperforation should be so narrow that a sufficient permeability of the metal layer is achieved.
  • a pitch between the individual micro holes between 5 microns and 50 microns.
  • the dimensions and the arrangement of the microperforated areas in the metal layer can be adapted to the respective requirements.
  • the metal layer can also be full-surface with microperforations
  • the distance between the microholes may be greater than if the layer has only limited areas with microperforations.
  • a generation and / or aftertreatment of the metal layer in such a way that it has a microperforation at least in certain areas can, moreover, always be advantageously used, irrespective of an application in connection with moisture-absorbent plastic shabs, when it comes to rendering a metal layer moisture-permeable without changing their appearance.
  • Such a microperforation of the metal layer can be produced in different ways:
  • microperforated metal layers consists of those from the field of wafer technology in computer chip. manufacture known methods for microstructuring of metal layers use. In this case, a continuous metal layer is covered with a photoresist. This photoresist is partially cured by either mask exposure or laser exposure. After development, the removal of the uncovered metal areas takes place in an etching step, which can take place both dry and wet-chemically.
  • this technology is technically and materially extremely complex and therefore currently not economical for DVD production.
  • the microperforation is at least partially introduced into the metal layer by a mechanical method.
  • the metal layer is mechanically broken to produce the microperforation.
  • a mechanical method Ie. the metal layer is mechanically broken to produce the microperforation.
  • a design of finest tips on a larger area are pressed perpendicular to the surface to be broken.
  • a system of buffers and springs ensures exactly specified contact pressure.
  • a reciever-like device that is guided over the surface and pressed into the surface in certain positions.
  • Such a mechanical perforation can also take place in a rotary process by means of needle rollers.
  • the metal layer to be perforated with the corresponding carrier material is passed under a roller, so that the roller acts on the metal layer with a precisely specified pressure.
  • Electro- sion is a removal process for electrically conductive materials.
  • a live electrode is guided against the workpiece until a spark between the electrode and the metal layer removes the metal.
  • the use of a laser technology for perforating the metal layer has been found to be particularly suitable.
  • the laser technology makes it possible to melt the smallest holes in the metal layer, even if a protective coating has already taken place.
  • the laser radiation by means of a beam guiding device, for example with a suitable xy facial expressions or xyz mimic with adjustable mirror or the like, over the surface of the Metal layer are guided while z. B. operated pulsed so as to bake each at the desired locations, the micro holes in the metal layer.
  • the layered body can also be moved relative to the laser beam.
  • the laser radiation is passed through a mask, so that the mask is imaged in the metal layer.
  • the DVD when making a microperforation in a DVD metal layer, the DVD will rotate and a pulsed laser beam will be passed over the DVD only in the radial direction so as to introduce a full perforation pattern into the hologram metal layer or DVD.
  • a half-side of a DVD provided with a hologram layer is enclosed on both sides by metal layers on a side of the metal layer covering the nanostructure containing the data and inside the DVD at the interface to the second half-side, and on the other side from the metallization of the hologram layer.
  • this is a plastic layer which is covered on both sides indirectly or directly with metal layers.
  • the moisture-absorbing plastic can be suitably chosen, for example, be provided with, preferably white, pigments.
  • the holographic layer may be underlaid white or else produced from a corresponding pigmented material.
  • an (additional) identification of the layered body is particularly preferably introduced into the metal layer with the introduction of the diffusion bridges. Ie. For example, it is ensured when introducing the microperforation that it has a specific microstructure that can serve as a marking.
  • the marking is designed such that it is not visible to the naked eye. For example, it can be ensured at a microperforation that a structure with regions of lower Kunststoffaji • surface density of the micro-holes is formed. Under the microscope or with other optical aids can then be checked whether a corresponding microstructure for identifying the object in question is present.
  • an additional security feature can be inserted without much additional effort, with which, for example, a data carrier can be authenticated.
  • an individual identification of the individual object with a serial number or the like can take place.
  • Such an individual marking can be carried out, for example, if the microperforation or microstructure is generated point by point with a laser.
  • a common marking of the entire series can take place, for example when masks are used, as described above.
  • FIG. 1 shows an enlarged schematic cross section through part of a DVD according to the prior art with a security feature in the form of an embossed hologram on the non-read side
  • FIG. 2 shows an enlarged schematic cross section through part of a DVD as in FIG. 1, wherein the metal layer of the embossing hologram has microperforated areas,
  • FIG. 3 shows a schematic representation of a first exemplary embodiment of a method for introducing a microperforation into the metal layer of an embossed hologram of a DVD
  • FIG. 4 shows a schematic representation of a second exemplary embodiment of a method for introducing a microperforation into the metal layer of an embossed hologram of a DVD
  • FIG. 5 shows a schematic illustration of a third exemplary embodiment of a method for introducing a microperforation into the metal layer of an embossed hologram of a DVD
  • FIG. 6 shows a schematic representation of a marking introduced into the microperforation structure of an embossed hologram metal layer.
  • FIG. 1 shows a detail of a cross section through a commercially available DVD 1 with a security hologram according to the prior art.
  • the two half sides of the DVD 1 each consist of a 0.6 mm thick polycarbonate disc 2, 3, in each of which the information is imprinted on a surface.
  • This information-bearing side has been provided with a metal layer 4, 5, respectively.
  • the metals will be nium, silver, gold or bronze used. With occasional optical data media, non-metal silicon is also used.
  • the two half sides consisting of the metallized polycarbonate disks 2, 3 have been joined together at their information-carrying sides by means of an adhesive layer 6.
  • the illustrated DVD is read out from one side, the read side L (lower side in the figure) by means of a laser (not shown).
  • a microperforation 10 is introduced into the metal layer 9 of the hologram as moisture-permeable diffusion bridges, so that both halves of the DVD 1 can absorb moisture almost equally and thus a disturbing curvature of the DVD 1 is reliably prevented ,
  • Figure 2 wherein in the illustrated embodiment, the micro-perforation 10 only partially in the metal layer
  • the metal layer 9 was introduced. Likewise, however, the metal layer 9 can also be provided over its entire surface with a microperforation 10.
  • FIG. 3 shows a possibility of introducing such a microperforation
  • a laser beam 11 is guided by means of a xy facial expressions on the surface of the DVD 1.
  • the laser beam 11 becomes this redirected about a two-axis rotatable mirror 12, which allows positioning of the laser beam 11 on the surface of the DVD 1 and the hologram.
  • a lens 13, through which the beam 11 is subsequently guided, ensures that the focus of the laser beam 11 is always focused exactly in the plane of the metal layer 9 and introduces the microperforation 10 there. This exact focusing is necessary in order to avoid that the metal sheets 4, 5, which are located in the interior of the DVD 1 and have the information structure, are changed by the laser beam 11.
  • the requirements for the accuracy of the focus can be reduced or it may be possible to dispense with a more precise focusing of the laser beam 11 completely, if z. B. the plastic layer 2 of the located under the metal layer to be processed 9 half page of dyed polycarbonate exists.
  • a preferred variant is the use of white-pigmented polycarbonate.
  • pigments Through the use of pigments, a laser beam passing through the perforation is diffusely scattered on the color pigments. By this distribution of the laser beam, the power of the beam decreases and the metallizations 4, 5 of the data carrier layers in the middle of the DVD 1 would not be changed.
  • Such a diffuse scattering of the laser beam 11 can also be achieved by a white background of the hologram.
  • This white underlay can be effected, for example, by full-surface printing of the non-read side N by means of commercially available printing techniques before application of the hologram. Also on this way in the further beam direction of the laser beam 11 after the perforation 10 introduced pigments scatter the laser light sufficiently to prevent interference of the metallizations 4, 5 of the data carrier layers.
  • An alternative to an adjustment of the laser beam 11 in the x and y direction is that the DVD 1 rotates and the laser beam 11 is displaced only in the radial direction.
  • FIG. 4 Another method that achieves the highest throughputs; is shown schematically in Figure 4.
  • the mask 15 contains the image of the desired perforation.
  • the laser beam 11 is directed to the metal layer 9 to be processed and thus an extremely exact implementation of the mask layout is achieved.
  • the processing time can be reduced to a fraction of a second, depending on the laser line and the desired processing area.
  • the laser beam 11 can also first be expanded via a suitable lens system and then passed through a quartz mask.
  • FIG. 5 shows a variant of this method.
  • the laser beam is redirected, for example, first by a mirror system 14 on the surface of the DVD 1, then passed through a mask 17 and expanded by a lens system 18.
  • a lens system 18 is used, which does not expand the beam so far that the entire surface of the DVD is irradiated, but only a segment 19 of the DVD is irradiated.
  • the DVD 1 rotates one segment further, and the neighboring segment is irradiated until finally the entire metal layer of the DVD 1 on the non-reading side N is provided with the microperforation.
  • This process takes slightly longer than the process shown in FIG. However, it has the advantage that a not quite as intense Siver laser beam 11 must be used, since a smaller expansion of the laser beam 11 takes place.
  • the above-described methods can also be used to introduce a specific structure into the micro-perforation 10, which can not be recognized by the naked eye for the viewer.
  • the surface density of the microholes can be increased (or a grid can be reduced), which can only be seen with optical aids such as a microscope, possibly even with a magnifying glass.
  • FIG. This structure then forms an identifier 20 of the respective DVD 1, which acts as a further security feature.
  • the same tag 20 is always inserted into the DVDs 1 exposed through this mask. If, however, a method is used, as shown in Figure 3, in which the micro holes are introduced pointwise by the laser, an individualization of each DVD can be done, for. B. by writing a serial number.

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  • Manufacturing Optical Record Carriers (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un corps (1) à plusieurs couches et en particulier d'un support optique de données, par exemple un DVD, selon lequel une couche (2) en matière synthétique absorbant l'humidité est recouverte directement ou indirectement par une couche métallique (9). Des ponts de diffusion (10) perméables à l'humidité sont ménagés dans la couche métallique (9). L'invention concerne en outre un corps (1) à plusieurs couches de ce type et en particulier un support optique de données (1), ainsi qu'un procédé de formation de ponts de diffusion (10) perméables à l'humidité dans une couche métallique (9).
PCT/DE2007/000144 2006-03-31 2007-01-26 Procédé de fabrication d'un corps à plusieurs couches et en particulier d'un support optique de données WO2007112710A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112007001358T DE112007001358A5 (de) 2006-03-31 2007-01-26 Verfahren zur Herstellung eines mehrschichtigen Körpers, insbesondere eines optischen Datenträgers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006015425.8 2006-03-31
DE102006015425A DE102006015425A1 (de) 2006-03-31 2006-03-31 Verfahren zur Herstellung eines mehrschichtigen Körpers, insbesondere eines optischen Datenträgers

Publications (1)

Publication Number Publication Date
WO2007112710A1 true WO2007112710A1 (fr) 2007-10-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2007/000144 WO2007112710A1 (fr) 2006-03-31 2007-01-26 Procédé de fabrication d'un corps à plusieurs couches et en particulier d'un support optique de données

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DE (2) DE102006015425A1 (fr)
WO (1) WO2007112710A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59151345A (ja) * 1983-02-03 1984-08-29 Toshiba Corp 情報記憶媒体
JP2001325751A (ja) * 2000-03-08 2001-11-22 Tokyo Magnetic Printing Co Ltd 光記録媒体およびその製造方法
WO2005078715A2 (fr) * 2004-02-13 2005-08-25 Plasmatreat Gmbh Procede pour revetir un support de donnees optique, et support de donnees optique revetu

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59151345A (ja) * 1983-02-03 1984-08-29 Toshiba Corp 情報記憶媒体
JP2001325751A (ja) * 2000-03-08 2001-11-22 Tokyo Magnetic Printing Co Ltd 光記録媒体およびその製造方法
WO2005078715A2 (fr) * 2004-02-13 2005-08-25 Plasmatreat Gmbh Procede pour revetir un support de donnees optique, et support de donnees optique revetu

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Publication number Publication date
DE102006015425A1 (de) 2007-10-04
DE112007001358A5 (de) 2009-03-12

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