Article with curved patterns formed of aligned pigment flakes

Patent metadata

Field	Value
Publication number	US-11198315-B2
Application number	US-202016733081-A
Country	US
Kind code	B2
Filing date	Jan 2, 2020
Priority date	Jan 12, 2012
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

In a printed article, pigment flakes are magnetically aligned so as to form curved patterns in a plurality of cross-sections normal a continuous imaginary line, wherein radii of the curved patterns increase along the imaginary line from the first point to the second point. When light is incident upon the aligned pigment flakes from a light source, light reflected from the aligned pattern forms a bright image which appears to gradually change its shape and move from one side of the continuous imaginary line to another side of the continuous imaginary line when the substrate is tilted with respect to the light source.

First claim

We claim:

1. A magnetic assembly, comprising:
a magnet having at least one planar surface parallel to a magnetic axis of the magnet, wherein the magnet generates a magnetic field; and
at least two steel sheet diverters, wherein each steel sheet diverter is placed on a portion of the at least one planar surface, and wherein the at least two steel sheet diverters are separated one from another by an opening; and
wherein the magnetic field curves around an edge of the at least two steel sheet diverters.

2. The magnetic assembly of claim 1 , wherein the magnet is circular shaped.

3. The magnetic assembly of claim 1 , wherein the at least two steel sheet diverters are each placed on a top planar surface of the magnet.

4. The magnetic assembly of claim 1 , wherein the at least two steel sheet diverters are three steel sheet diverters.

5. The magnetic assembly of claim 1 , wherein the at least two steel sheet diverters each have a different size.

6. The magnetic assembly of claim 1 , wherein the at least two steel sheet diverters each have a different shape.

7. The magnetic assembly of claim 1 , wherein the magnet is a compression bonded neodymium boron iron magnet.

8. The magnetic assembly of claim 1 , wherein the magnetic field penetrates through a plane of the at least two steel sheet diverters.

9. A method of forming an article, comprising:
providing the magnetic assembly of claim 1 ;
placing a substrate coated with a magnetic pigment onto the at least two steel sheet diverters; and
aligning the magnetic pigment in the magnetic field to form an article.

10. The method of claim 9 , further comprising viewing the article at a normal angle to yield a normal image; tilting the article around a first axis to yield a first image; tilting the article around a second axis to yield a second image; and tilting the article around the second axis in an opposite direction to yield a third image, wherein the article morphs into the first image, the second image, and the third image with a seamless transition.

11. The method of claim 9 , wherein the magnetic field bows around an edge of each of the at least two steel sheet diverters to form an image.

12. The method of claim 11 , wherein the image includes at least two curved bright lines.

13. The method of claim 12 , wherein an intensity of the at least two curved bright lines changes when viewed at a normal angle and at a tilt angle.

Assignees

• Viavi Solutions Inc

Inventors

• Raksha Vladimir P
• Hynes John
• Holden Laurence
• Coombs Paul G

Classifications

• B41M1/00 Primary

  Inking and printing with a printer's forme · CPC title

• B42D25/41

  using electromagnetic radiation (B42D25/435 takes precedence) · CPC title

• B44F1/10

  Changing, amusing, or secret pictures · CPC title

• C09D5/36

  Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre · CPC title

• B41M3/14

  Security printing {(securities B42D25/29)} · CPC title