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

• US 9,257,059 B2
• Filed: 11/29/2012
• Issued: 02/09/2016
• Est. Priority Date: 07/31/2001
• Status: Expired due to Term

• Current Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Original Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Inventors: Raksha, Vladimir P., Coombs, Paul G., Markantes, Charles T., Argoitia, Alberto, Phillips, Roger W.
• Primary Examiner(s): Higgins, Gerard
• Assistant Examiner(s): Reddy, Sathavaram I
• Application Number:
  US13/689,110
• Publication Number:
  US 20130084411A1
• Time in Patent Office: 1,167 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: B05D 3/207 post-treatment by magnetic fields
• CPC Class Codes: B41M 3/148 Transitory images, i.e. images only visible from certain viewing angles
• CPC Class Codes: B42D 2033/16 Magnetic or magnetisable material
• CPC Class Codes: B42D 2035/20 Optical effects
• CPC Class Codes: B42D 25/29 Securities; Bank notes
• CPC Class Codes: B42D 25/369 Magnetised or magnetisable materials
• CPC Class Codes: G02B 26/026 based on the rotation of particles under the influence of an external field, e.g. gyricons, twisting ball displays based on orientable dipolar particles G02F1/172; based on electrophoresis G02F1/167
• CPC Class Codes: G02B 27/0025 for optical correction, e.g. distorsion, aberration
• CPC Class Codes: G02B 5/09 Multifaceted or polygonal mirrors , e.g. polygonal scanning mirrors; Fresnel mirrors
• CPC Class Codes: G09F 3/0376 using a special technique to detect tampering, e.g. by ultrasonic or optical means
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles

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.

Claims

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.