| 摘要 |
PCT No. PCT/GB91/02140 Sec. 371 Date May 19, 1993 Sec. 102(e) Date May 19, 1993 PCT Filed Dec. 3, 1993 PCT Pub. No. WO92/10608 PCT Pub. Date Jun. 25, 1992.A security article such as a banknote, credit card, identity card or travel document includes a security element which is visually detectable in transmitted light to display portions which transmit light and portions which are opaque, the security element including a plurality of layers that include a light-transmitting support layer and two or more series of opaque regions. The arrangement of the opaque regions is such that at certain parts of the security element the regions overlap to prevent light transmission and elsewhere along its length the opaque regions do not overlap or only partially overlap such that light transmission through the security element occurs. |
