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.
Claims22
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 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, and
- wherein the first reflective effect is a first movement of left and right portions of a reflection from the optical article that is larger than a second movement of a center portion of the reflection from the optical article.
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 one or more magnets include two magnets provided parallel to each other,
- wherein a corner of the two magnets is cut off or rounded,
- wherein the magnetic field aligns the plurality of reflective magnetic platelets in accordance with at least part of a surface of revolution,
- 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, and
- wherein the first reflective effect is different from the second reflective effect;
- and
- setting or hardening the organic binder.
(canceled)
A document, comprising:
- an optical article comprising a plurality of reflective magnetic platelets,
- wherein the plurality of reflective magnetic platelets are aligned in accordance with at least part of a surface of revolution,
- wherein the plurality of reflective magnetic platelets are aligned to cause a first reflective effect of the optical article when the optical article is rotated around a first axis and to cause a second reflective effect of the optical article when the optical article is rotated around a second axis,
- wherein the first reflective effect is different from the second reflective effect, and
- wherein the second reflective effect is a brightening of a first portion of a reflection from the optical article and a darkening of a second portion of the reflection from the optical article.
(canceled)
Dependencies are inferred from the claim text.