Optical identification element having non-waveguide photosensitive substrate with diffraction grating therein
US7433123B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2005 |
| Grant date | Oct 7, 2008 |
| Priority date | — |
| Expiry date | Sep 10, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06046
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical identification element (also known herein as a microbead) that is made from pieces of an optical fiber or substrate that includes an inner core or region being surrounded by an outer cladding region. The optical fiber or substrate has an identification code imparted therein containing coded information. The identification code may be in the form of a Bragg grating inscribed or written in either the inner core or outer cladding. The optical identification element may be microscopic in size having a length in a range of 1-1,000 microns or smaller; or for larger applications may have a length of 1.0-1,000 millimeters or more. The outer diameter may be as small as less than 1,000 microns, as well as in a range of 1.0 to 1,000 millimeters for larger applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.