Fingerprint image input apparatus
US5635723A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Dec 26, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/26
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A fingerprint image input apparatus comprises a plane light source for irradiating light having a two-dimensional light distribution and an approximately even luminance, a two-dimensional image sensor capable of allowing the light to pass through, and an optical part for guiding light from the plane light source, having passed the two-dimensional image sensor, to a finger and guiding light reflected at the finger to the photoelectric converting element. The two-dimensional image sensor includes a plurality of pixels arranged in a matrix form. A bias power source for supplying a bias voltage to the individual pixels, a scanning circuit for outputting a scan signal to the pixels and a first detecting circuit for detecting photoelectric data signals from the pixels are connected to those pixels via bias lines, scan lines and data lines. Connected to the bias lines are a signal generator for generating a finger detection signal to detect the contact of a finger with the optical part and a signal detecting circuit for detecting a change in the finger detection signal. A switch controller outputs a control signal in accordance with a finger detection mode and a fingerprint image input mo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.