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35 条记录 (耗时 0.019 秒)

    Methods and apparatus for rendering an optically encoded medium unreadable and tamper-resistant
    32.
    发明申请
    Methods and apparatus for rendering an optically encoded medium unreadable and tamper-resistant 审中-公开

    公开(公告)号：US20050058800A1

    公开(公告)日：2005-03-17

    申请号：US10877812

    申请日：2004-06-25

    申请人： Nabil Lawandy ,  Charles Zepp ,  Andrei Smuk ,  Marianne Krieg-Kowald

    发明人： Nabil Lawandy ,  Charles Zepp ,  Andrei Smuk ,  Marianne Krieg-Kowald

    IPC分类号： B32B3/02 ,  G11B3/70 ,  G11B7/005 ,  G11B7/24

    CPC分类号： G11B7/26 ,  G11B7/005 ,  G11B7/252 ,  G11B20/00086 ,  G11B20/00608 ,  G11B20/00695 ,  G11B20/0084 ,  G11B23/281 ,  Y10S430/146

    摘要： Methods and apparatus are provided for making an optically readable media unreadable and tamper-resistant. A method is disclosed for making an optically readable media unreadable, as is a media that operates in accordance with the method. The method has steps of (a) providing the media with a readout surface layer that is non-flat (i.e., textured in some way, such as by embossing, scratching, depositing a non-planar layer or regions, such as droplets) and that inhibits optical readout of the media; (b) applying a coating layer to the non-flat surface layer to smooth the non-flat surface and to enable optical readout of the media; and, after an initiation of a readout period, (c) removing the coating layer so as to expose the non-flat readout surface layer, thereby inhibiting optical readout of the media. Preferably, the coating layer is substantially index matched to the readout surface layer. In one embodiment the step of removing includes a step of evaporating at least one component material of the coating layer, while in another embodiment the step of removing includes a step of subliming at least one component material of the coating layer. A method is also disclosed for discouraging tampering with a readout-limiting mechanism of an optically readable media, as is a media that is constructed so as to operate in accordance with the method. In this embodiment the method has steps of: (a) providing the media with at least one layer that embodies the readout-limiting mechanism; (b) providing a textured surface that forms part of a layer that underlies the at least one layer, where the textured surface inhibits optical readout of the media; and (c) applying a coating layer over the textured surface to smooth the textured surface and to enable optical readout of the media, wherein removal of the coating layer exposes the textured surface thereby inhibiting optical readout of the media. The disk can be packaged in a sealed container with a source of an agent that inhibits transport of a volatile species from the color forming layer or from a layer that sublimates, wherein the onset of the limited play period coincides with the opening of the container.

    Methods and apparatus for rendering an optically encoded medium unreadable
    35.
    发明申请
    Methods and apparatus for rendering an optically encoded medium unreadable 审中-公开

    公开(公告)号：US20040152015A1

    公开(公告)日：2004-08-05

    申请号：US10763857

    申请日：2004-01-23

    申请人： FlexPlay Technologies, Inc.

    发明人： Nabil M. Lawandy ,  Charles M. Zepp ,  Kenneth S. Norland

    IPC分类号： G11B007/24

    CPC分类号： G11B20/00086 ,  G11B7/252 ,  G11B7/2534 ,  G11B7/2542 ,  G11B7/2575 ,  G11B7/2585 ,  G11B20/00797 ,  G11B23/282 ,  G11B23/505 ,  Y10S430/146

    摘要： Methods and apparatus are provided for making an optically readable media unreadable. The method includes steps of (a) providing the media with an optically activated mechanism that degrades the reflectivity of a surface wherein information is encoded; (b) exposing the media to optical radiation for reading out the information; and, during the step of exposing, (c) initiating the operation of the optically activated mechanism. In this embodiment the step of initiating includes steps of (d) generating singlet oxygen in a layer disposed on the media; and (e) reacting the singlet oxygen with a metal-containing layer for oxidizing the surface of the metal-containing layer, thereby degrading the reflectivity of the surface. In a further aspect the optically activated mechanism causes a defocusing of a readout beam, thereby degrading reflection of the readout beam from a surface wherein information is encoded. In another embodiment the method deforms a surface of the layer resulting in readout beam aberration or in an inability to correctly stay on track. In another embodiment a portion of the surface is removed to the atmosphere, such as by evaporation of sublimation. In this embodiment a layer of the media is comprised of a volatile component and at least one other component. Removing at least some of volatile component by evaporation or sublimation causes an increase in at least one of photoabsorption or scattering or surface roughness with the remaining component, thereby rendering at least a portion of encoded information of the media unreadable, or affecting the tracking operation.