US 12,064,987 B2
Optical device with magnetic flakes and structured substrate
Vladimir P. Raksha, Santa Rosa, CA (US); Cornelis Jan Delst, Fairfax, CA (US); and Paul G. Coombs, Santa Rosa, CA (US)
Assigned to VIAVI SOLUTIONS INC., Chandler, AZ (US)
Filed by VIAVI SOLUTIONS INC., San Jose, CA (US)
Filed on Apr. 24, 2020, as Appl. No. 16/857,845.
Claims priority of provisional application 62/839,315, filed on Apr. 26, 2019.
Prior Publication US 2020/0338922 A1, Oct. 29, 2020
Int. Cl. B42D 25/369 (2014.01); B42D 25/328 (2014.01); B42D 25/29 (2014.01)
CPC B42D 25/369 (2014.10) [B42D 25/328 (2014.10); B42D 25/29 (2014.10)] 20 Claims
OG exemplary drawing
 
1. An optical device comprising:
a structured substrate comprising a topography that includes an unstructured, planar portion having a planar surface and a structured, non-planar portion having a plurality of adjacent, angled surfaces that are angled relative to the planar surface and arranged to form an image on the substrate;
a reflective layer on the structured substrate, wherein the reflective layer mimics the topography; and
a coating with magnetic flakes on the reflective layer or on another side of the structured substrate, the magnetic flakes being aligned to provide a transparent angle for viewing the image and the unstructured planar portion,
wherein the plurality of adjacent, angled surfaces are angled to provide improved reflectivity at the transparent angle compared with the reflectivity of the unstructured, planar portion so that the structured-non-planar portion has the effect of appearing brighter than the unstructured planar portion if both are viewed at the transparent angle.