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Optical security device based on a surface of revolution

  • US 10,642,214 B2
  • Filed: 08/13/2018
  • Issued: 05/05/2020
  • Est. Priority Date: 08/13/2018
  • Status: Active Grant
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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