Method and apparatus for capturing a fingerprint
US11468702B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2021 |
| Grant date | Oct 11, 2022 |
| Priority date | — |
| Expiry date | Aug 31, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45514
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A fingerprint capturing apparatus includes a plurality of panel capacitors each configured to output an alternating charge signal indicating a capacitance proportional to a proximity of a portion of a subject's finger, a de-serialized amplifier circuit including an operational amplifier that receives the alternating charge signal from the plurality of panel capacitors, and a change in condition control circuit configured to make a change in an operating condition of the de-serialized amplifier based on a voltage of an output of the operational amplifier. The change in condition control circuit also configured to output a count of a number of times of making the change in the operating condition of the de-serialized amplifier. The apparatus also including a processor circuit configured to recognize the subject's fingerprint based on the count of the number of times of making the change in the operating condition of the de-serialized amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.