Optical fingerprint imaging device
US4925300A · kind A · utility
18Cited by
19References
11Claims
0Family size
Inventor
Key dates
| Filing date | Aug 2, 1988 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Aug 2, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/1172
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Apparatus suitable for imaging fingerprints directly from a finger in contact with a transparent surface of a lens is described. The conical nature of the contact surface affords the opportunity for a single such surface to accommodate a wide range of finger sizes. The front surface of the lens is conical, and a light source is provided for illuminating the finger, with ridges of the fingerprint being imaged and light illuminating the papillary valleys being refracted away from the imaging means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.