Optical security device based on a surface of revolution
AssigneeViavi Solutions Inc.
InventorsVladimir P. Raksha, Cornelis Jan Delst
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Abstract
An optical article printed on a substrate may include an organic binder; and a plurality of reflective magnetic platelets provided in the organic binder, wherein the plurality of reflective magnetic platelets are substantially aligned in accordance with at least part of a surface of revolution, and wherein the plurality of reflective magnetic platelets are aligned to cause a first reflective effect of the optical article when the substrate is rotated around a first axis and to cause a second reflective effect of the optical article when the substrate is rotated around a second axis, wherein the first reflective effect is different from the second reflective effect.
Claims20
An optical article printed on a substrate, comprising:
- a plurality of reflective magnetic platelets,
- wherein the plurality of reflective magnetic platelets are aligned to exhibit a first reflective effect in a first view,
- wherein the first reflective effect comprises a hyperbolic parabola shaped reflective effect,
- wherein the first view is a head-on view without rotating the optical article around an axis, and
- wherein the plurality of reflective magnetic platelets are configured to cause a second reflective effect in a second view.
An optical article, comprising:
- one or more magnets,
- wherein the one or more magnets are configured to exhibit a hyperbolic parabola shaped reflection in a head-on view without rotating the optical article around a first axis or a second axis,
- wherein the one or more magnets are configured to exhibit a first reflective effect when the optical article is rotated about the first axis, and
- wherein the one or more magnets are configured to exhibit a second reflective effect when the optical article is rotated about the second axis that is orthogonal to the first axis.
Dependencies are inferred from the claim text.