Optical security device based on a surface of revolution
AssigneeViavi Solutions Inc.
InventorsVladimir P. Raksha, Cornelis Jan Delst
Life of this patent
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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:
- an organic binder;
- and
- a plurality of reflective magnetic platelets provided in the organic binder,
- wherein the plurality of reflective magnetic platelets are aligned to cause a first reflective effect of the optical article when the substrate is moved in a first manner and to cause a second reflective effect of the optical article when the substrate is moved in a second manner,
- wherein the first reflective effect is different from the second reflective effect, and
- wherein the first reflective effect comprises a widening of a top of a funnel-shaped reflection in relation to another portion of the funnel-shaped reflection.
A method for forming an optical article on a substrate, comprising:
- providing an organic binder that includes a plurality of reflective magnetic platelets on the substrate;
- applying a magnetic field to the organic binder using one or more magnets, wherein the magnetic field aligns the plurality of reflective magnetic platelets,
- wherein the plurality of reflective magnetic platelets are aligned to cause a first reflective effect of the optical article when the substrate is moved in a first manner and to cause a second reflective effect of the optical article when the substrate is moved in a second manner,
- wherein the first reflective effect is different from the second reflective effect, and
- wherein the first reflective effect comprises a widening of a top of a funnel-shaped reflection in relation to another portion of the funnel-shaped reflection;
- and
- setting or hardening the organic binder.
A document, comprising:
- an optical article comprising a plurality of reflective magnetic platelets,
- wherein the plurality of reflective magnetic platelets are aligned to cause a first reflective effect of the optical article when the optical article is moved in a first manner and to cause a second reflective effect of the optical article when the optical article is moved in a second manner,
- wherein the first reflective effect is different from the second reflective effect, and
- wherein the first reflective effect comprises a widening of a first portion of a reflection from the optical article and simultaneously a narrowing of a second portion of the reflection from the optical article.
Dependencies are inferred from the claim text.