OPTICALLY VARIABLE SECURITY THREADS AND STRIPES

摘要

The present invention discovers a security thread or stripe. The security thread or stripe comprises i) a first optically variable layer (1,8) imparting a first different color impression at different viewing angles, ii) a second optically variable layer (2,9) imparting a second different color impression at different viewing angles, iii) a first color constant layer (4,6) having a color matching the color impression of the first or second optically variable layer at a first viewing angle, iv) a second color constant layer (5,7) having a color matching the color impression of the first or second optically variable layer at a second viewing angle, and v) a substrate, wherein the first optically variable layer, the second optically variable layer, the first color constant layer and the second color constant layer are jointly visible from one side of the security thread or stripe.