Optical imaging device
US5920384A · kind A · utility
134Cited by
8References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1997 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Dec 9, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/37
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An optical imaging device such as a fingerprint imager has a platen formed of a plurality of parallel prisms and a light source for illuminating a portion of the platen. An optical sensor is disposed so as to receive light from the light source reflected off a surface of the platen and directed toward the optical sensor. The platen is mounted moveable relative to the sensor so as to allow scanning of a fingertip in contact with the platen during relative motion of the platen and the sensor. Preferably, the platen is formed of a microprism structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.