Dynamic appearance-changing optical devices (DACOD) printed in a shaped magnetic field including printable fresnel structures
US9257059B2 · kind B2 · utility
22Cited by
133References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2012 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | Nov 29, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/25
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.