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    • 4. 发明申请
    • RETROREFLECTOR WITH LOW REFRACTIVE INDEX BACKING
    • 具有低折射率反射的反射器
    • WO2014051867A3
    • 2014-07-31
    • PCT/US2013054833
    • 2013-08-14
    • AVERY DENNISON CORP
    • CHAPMAN STEVEN R
    • G02B1/11G02B5/124
    • G02B5/124G02B1/118Y10T156/1028
    • A retroreflective article (1) includes a first transparent layer (7) having a back surface with retroreflective prisms (3), and a planar front surface that has an index of refraction n1. A second transparent layer (9) having an index of refraction n2 is less than n1 overlies the back surface of the first layer. The second layer includes an array of uniform nanostructures of transparent material that define pores having a width that is less than one half of the wavelength of visible light. The nanostructures may be an array of parallel, same- sized nanorods that are obliquely oriented with respect to the first transparent layer, or a grid-like or parallel array of tapered nano- ridges of uniform size that define tapered pores or tapered grooves. The second layer preferably has a porosity greater than 60% so that the resulting index of refraction n1 is no larger than about 1.20 in order to achieve high-efficiency total internal reflection over a broad range of entrance angles.
    • 回射制品(1)包括具有后向反射棱镜(3)的后表面的第一透明层(7)和具有折射率n1的平面前表面。 具有折射率n2的第二透明层(9)小于n1覆盖在第一层的背面上。 第二层包括均匀纳米结构的透明材料的阵列,其限定宽度小于可见光波长的一半的孔。 纳米结构可以是相对于第一透明层倾斜取向的平行相同尺寸的纳米棒的阵列,或者形成均匀尺寸的锥形纳米脊的格子状或平行阵列,其限定锥形孔或锥形凹槽。 第二层优选具有大于60%的孔隙率,使得所得到的折射率n1不大于约1.20,以便在宽的入射角范围内实现高效率的全内反射。