Scanning capacitive semiconductor fingerprint detector
US6580816B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2001 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | Jul 25, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1306
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A scanning fingerprint detection system includes an array of capacitive sensing elements, the array having a first dimension greater than the width of a fingerprint and a second dimension less than the length of a fingerprint. Each of the capacitive sensing elements has first and second conductor plates connected across an inverting amplifier, the conductor plates forming capacitors with the ridges and valleys of a fingerprint of a finger pressed against a protective coating above the array, the inverting amplifier generating a signal indicative of a ridge or valley. Circuitry is provided for scanning the array to capture an image of a portion of fingerprint and for assembling the captured images into a fingerprint image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.