Dynamic appearance-changing optical devices (DACOD) printed in a shaped magnetic field including printable fresnel structures

Patent metadata

Field	Value
Publication number	US-9257059-B2
Application number	US-201213689110-A
Country	US
Kind code	B2
Filing date	Nov 29, 2012
Priority date	Jul 31, 2001
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A device includes a substrate and at least 1,000 flakes resting upon the substrate, each flake including a magnetic layer. The plurality of flakes are aligned so as to form a plurality of rings or curves, wherein within each ring or curve, flakes are tilted at a same angle with respect to the substrate and planes extending from surfaces of said flakes intersect with one another. The device provides a visible image of a single ring or curve when illuminated with a single light source, and three rings or curves are visible when three light sources illuminate the device. The device may be used as a printed light detector.

First claim

The invention claimed is:

1. A device comprising a substrate and a plurality of flakes comprising at least 1,000 flakes resting in a carrier upon the substrate,
wherein the plurality of flakes are magnetically aligned so as to form a plurality of adjacent rings, wherein within each ring of the plurality of adjacent rings, the plurality of flakes are tilted at a same angle with respect to the substrate and planes extending from surfaces of said plurality of flakes intersect with one another,
and wherein the plurality of adjacent rings provide a visible image of a single reflected ring when illuminated with a single light source, and three reflected rings are visible when three light sources illuminate the plurality of adjacent rings.

2. The device as defined in claim 1 wherein the device is a printed light detector.

3. The device as defined in claim 1 wherein the plurality of flakes comprises at least 10,000 flakes.

4. The device as defined in claim 1 wherein a closed region is printed with the plurality of flakes.

5. A method of manufacturing the device defined in claim 1 comprising printing the substrate with ink comprising the plurality of flakes dispersed therein while using a torus-shaped field for magnetically aligning the plurality of flakes.

6. The method as defined in claim 5 , wherein the plurality of flakes are magnetically aligned by two stacked magnets of different radii.

Assignees

• Viavi Solutions Inc

Inventors

• Raksha Vladimir P
• Coombs Paul G
• Markantes Charles T
• Argoitia Alberto
• Phillips Roger W

Classifications

• H02J9/061 Primary

  for DC powered loads · CPC title

• B41M3/148 Primary

  Transitory images, i.e. images only visible from certain viewing angles · CPC title

• B42D2035/20

  Operations & Transport · mapped topic

• B42D25/369 Primary

  Magnetised or magnetisable materials · CPC title

• Y10T428/24802

  Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] · CPC title