Roll fingerprint processing apparatus
US4553837A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1983 |
| Grant date | Nov 19, 1985 |
| Priority date | — |
| Expiry date | Oct 24, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1335
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A fingerprint processing apparatus is capable of generating a roll fingerprint image on a flat plane without distorting the image of the fingerprint. The apparatus includes a source of an interrogating light beam, optical scanning equipment, an array of photoelectric transducers, lenses, and electrical scanning equipment. A cylindrical-segment platen is provided having an upper surface with an anti-reflective coating which receives, positions and supports a finger, and a lower surface which receives and transmits the interrogating light beam. A finger positioned on the upper platen surface modulates the interrogating light beam to provide a reflected light beam having fingerprint information. A motor rotates the light source, optical scanning equipment, array, lenses, and an element of the electrical scanning equipment. The axis of rotation of the optical scanning equipment is substantially the same as the axis of the upper surface of the platen. The optical scanning equipment scans the circumference of the platen such that the angle of incidence of the light beam on the fingerprint object at the curved back of the platen remains constant. The electrical scan is along the axis of t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.