Infra-red sensing array
US5420428A · kind A · utility
12Cited by
8References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 1993 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | May 5, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The sensing array detects an image by measuring the changes in the dielectric constant of individual capacitors in a rectangular array of capacitors. The present invention avoids the use of isolation transistors to eliminate the effects of other capacitors in the array when measuring the capacitance of a given capacitor in the array. During the measurement of any given capacitor in the array, the present invention maintains a zero potential difference across the capacitors that are not being measured, thereby eliminating any interference that might be caused by these capacitors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.