On-axis illumination for iris imaging
US8092021B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2008 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | May 11, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/1216
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention provides a rapid, high quality iris imaging system. In one embodiment, on-axis illumination is used. A single steering mechanism steers both the camera and the illumination, without parallax issues. The illumination beam can be combined along the camera's optical axis before or after the fine steering and focus correction mechanism. In a pre-correction configuration, the iris illumination spot can be reduced in size to be only slightly larger than the iris. In both the pre and post-correction configuration, the eye safety limits will be most critical at the subject, which allows for maximization of the illumination flux.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.