Optical authentication device
US5296949A · kind A · utility
15Cited by
6References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1992 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Apr 23, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2270/52
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical device for receiving incident light having a minimum wavelength, and for producing a resultant light containing an optical image. The device includes a first material having a first index of refraction and a surface embossed with an optical interference pattern, and a second material having a second index of refraction deposited onto the embossed surface of the first material. The depth of deposition is at least equal to three quarters of the minimum wavelength component of the incident light within the second material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.