SECURITY DEVICE
    1.
    发明申请
    SECURITY DEVICE 有权
    安全装置

    公开(公告)号:US20120068450A1

    公开(公告)日:2012-03-22

    申请号:US13203389

    申请日:2010-02-26

    IPC分类号: B42D15/00

    摘要: A security device for authenticating bank notes, documents and other items, comprises a luminescent material for producing luminescent radiation of first and second wavelengths. The security device includes an optically variable structure for controlling emission of luminescent radiation of at least one of the first and second wavelengths from the security device, the security device being arranged to permit, from an area of the optically variable structure, emission of luminescence of the first and second wavelengths from the security device. The optically variable structure causes the relative emissivity of the security device for luminescent radiation of the first and second wavelengths to change with a change m emission angle, so that the security device produces an angle-dependent colour shift m the emitted luminescent radiation. The optically variable structure may comprise an optical interference stack that controls transmission of luminescent radiation therethrough in response to the wavelength of luminescent radiation.

    摘要翻译: 用于认证钞票,文件和其他物品的安全装置包括用于产生第一和第二波长的发光辐射的发光材料。 安全装置包括光学可变结构,用于控制来自安全装置的至少一个第一和第二波长的发光辐射,安全装置被布置成允许从光学可变结构的区域发射 来自安全装置的第一和第二波长。 光学可变结构使得第一和第二波长的发光辐射的安全装置的相对发射率随着变化m发射角度而改变,使得安全装置在发射的发光辐射中产生与角度相关的色移。 光学可变结构可以包括光学干涉叠层,其响应于发光辐射的波长来控制通过其的发光辐射的透射。