US 11,945,255 B2
Optical security element
Vladimir P. Raksha, Santa Rosa, CA (US); and Cornelis Jan Delst, Fairfax, CA (US)
Assigned to VIAVI SOLUTIONS INC., Chandler, AZ (US)
Filed by VIAVI SOLUTIONS INC., Chandler, AZ (US)
Filed on Jun. 13, 2022, as Appl. No. 17/839,013.
Claims priority of provisional application 63/210,365, filed on Jun. 14, 2021.
Prior Publication US 2022/0396088 A1, Dec. 15, 2022
Int. Cl. B42D 25/369 (2014.01); B42D 25/40 (2014.01)
CPC B42D 25/369 (2014.10) [B42D 25/40 (2014.10)] 19 Claims
OG exemplary drawing
 
1. An assembly, comprising:
a first magnet;
a substrate positioned above the first magnet, and having a surface for receiving a composition including a plurality of magnetizable platelets; and
a second magnet, positioned above the substrate;
wherein the first magnet is incorporated into a first cylinder, and the second magnet is incorporated into a second cylinder; and
wherein the second cylinder is hollow, and the second magnet is cylindrical.