Fingerprint imaging device including an optical plate having microreflectors
US6956608B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2000 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Jul 13, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/40
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A compact-sized fingerprint imaging device includes an optical plate for creating a fingerprint pattern at a finger field on the optical plate. The fingerprint pattern is illuminated with light from an illuminating tool to create imaging light rays. A small thickness of the optical plate, and hence of the fingerprint imaging device, is possible due to a design that includes an array of microreflectors covering a part of the optical plate, the microreflectors being distributed along a base surface. The imaging light rays from the fingerprint pattern that are reflected by the array of microreflectors are received by an imaging lens that projects an image of the fingerprint pattern to an image sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.