Scanning optical semiconductor fingerprint detector
US6628377B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2000 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Apr 4, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/12
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A narrow array optical fingerprint detector that substantially eliminates over-sampling of the array measures the speed of a finger moving over the array and scans the array at a rate determined by the speed of movement of the finger. The fingerprint detector measures the speed of finger movement with a transparent cylinder rotatably mounted adjacent the array. The transparent cylinder is mounted to engage the finger and rotate as the finger is swept past the array. A light chopper is mounted for rotation with the cylinder. A photo-sensor is mounted adjacent the light chopper. The photo-sensor produces a signal in response to light being chopped by the light chopper. The photo-sensor is operably connected to scanning circuitry. Each time the scanning circuitry receives a signal from the photo-sensor, the scanning circuitry scans the array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.