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    • 4. 发明申请
    • OPTICAL STRUCTURE
    • 光学结构
    • WO0203104A2
    • 2002-01-10
    • PCT/GB0102965
    • 2001-07-02
    • OPTAGLIO LTDHUDSON PHILIPDRINKWATER JOHN
    • HUDSON PHILIPDRINKWATER JOHN
    • B42D15/10G02B
    • G03H1/18B41M3/148B41M5/24B42D25/328B42D25/41G03H1/0011G03H2001/184G03H2210/54G03H2260/62
    • An optical device for security and anti-counterfeit applications comprises a holographic diffractive structure comprising a discrete region that in response to white light illumination generates a holographic image by a process of diffraction of light in one embodiment combined with a paper substrate which also contains a secure mark produced by laser ablation of the structure, the mark being characterised by various attributes: variable cut width and pattern, being visible both in reflected light and also in transmitted light, variable depth of cut, variable perforation visible in transmission, variable reflection characteristics. In one embodiment when combined with paper based laser mark has elements in both metallised diffractive region and paper region, the marks on different regions showing different characteristics and thereby securely linking diffractive structure and paper substrate and also showing different characteristics of marking pattern on the different materials.
    • 用于安全和防伪应用的光学装置包括全息衍射结构,该全息衍射结构包括离散区域,响应于白光照明,通过在一个实施例中结合纸基板的光衍射过程产生全息图像,该纸基底还包含安全 该标记由结构的激光烧蚀产生,该标记的特征在于各种属性:可变切割宽度和图案,在反射光以及透射光下都可见,可变深度切割,透射中可见的可变穿孔,可变反射特性。 在一个实施例中,当与基于纸的激光标记组合时,在金属化衍射区域和纸张区域中具有元件,不同区域上的标记显示不同的特性,从而可靠地连接衍射结构和纸基材,并且还在不同材料上显示不同的标记图案特征 。