Optical security device based on a surface of revolution
First Claim
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1. 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, andwherein 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, andwherein 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.
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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.
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Citations
20 Claims
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1. An optical article printed on a substrate, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for forming an optical article on a substrate, comprising:
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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. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. 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. - View Dependent Claims (16, 17, 18, 19, 20)
Specification