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    • 4. 发明申请
    • OPTICAL EFFECT LAYERS SHOWING A VIEWING ANGLE DEPENDENT OPTICAL EFFECT, PROCESSES AND DEVICES FOR THEIR PRODUCTION, ITEMS CARRYING AN OPTICAL EFFECT LAYER, AND USES THEREOF
    • 光学效果层显示视角依赖光学效应,其生产过程和设备,携带光学效应层的物品及其用途
    • US20150352883A1
    • 2015-12-10
    • US14759836
    • 2013-12-20
    • SICPA HOLDING SA
    • Mathieu SCHMIDEvgeny LOGINOVClaude Alain DESPLANDPierre DEGOTT
    • B42D25/30H01F7/02
    • B42D25/30B05D3/20B05D3/207B41M3/148B42D25/29B42D25/369B42D2033/16B42D2033/20B42D2035/20H01F7/0273H01F7/0278H01F41/16Y10T428/24273
    • The invention relates to the field of the protection of security documents such as for example banknotes and identity documents against counterfeit and illegal reproduction. In particular, the invention relates to optical effect layers (OEL) showing a viewing-angle dependent optical effect, devices and processes for producing said OEL and items carrying said OEL, as well as uses of said optical effect layers as an anti-counterfeit means on documents. The OEL comprises a plurality of non-spherical magnetic or magnetizable particles, which are dispersed in a coating composition comprising a binder material, the OEL comprising two or more loop-shaped areas, being nested around a common central area that is surrounded by the innermost loop-shaped area, wherein, in each of the loop-shaped areas, at least a part of the plurality of non-spherical magnetic or magnetizable particles are oriented such that, in a cross-section perpendicular to the OEL layer and extending from the centre of the central area to the outer boundary of the outermost loop-shaped area, the longest axis of the particles in each of the cross-sectional areas of the looped-shaped areas follow a tangent of either a negatively curved or a positively curved part of hypothetical ellipses or circles.
    • 本发明涉及保护文件的领域,例如纸币和身份证件,防止伪造和非法复制。 特别地,本发明涉及显示视角依赖光学效应的光学效应层(OEL),用于产生所述OEL的装置和工艺以及携带所述OEL的物品以及所述光学效应层的用途作为防伪装置 在文件上。 OEL包括多个非球形磁性或可磁化颗粒,其分散在包含粘合剂材料的涂料组合物中,包含两个或更多个环形区域的OEL嵌套在围绕最内层的公共中心区域周围 环形区域,其中,在每个环形区域中,多个非球形磁性或可磁化颗粒的至少一部分被定向成使得在垂直于OEL层的横截面中并且从 中心区域的中心到最外面的环形区域的外边界,环形区域的每个横截面区域中的颗粒的最长轴线遵循负弯曲或正弯曲部分的切线 假设的椭圆或圆。