Integrated radiation sensing array
US4675739A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Mar 20, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/198
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An incident radiation sensing apparatus comprises an array of photosensitive elements formed as an integrated circuit on a substrate. Each of the photosensitive elements includes a capacitor for storing charge, a conductive means for charging the capacitor to a preselected magnitude, a blocking means for inhibiting the discharge of charge stored on the capacitor; and a photoresponsive means formed from deposited semiconductor material for generating charge carriers at a rate responsive to the intensity of radiation incident upon the photoresponsive means. The photoresponsive means is connected to the capacitor so that the charge carriers generated in the photoresponsive means reduce the magnitude of the charge on the capacitor as a function of the magnitude of, and the time incidence of, the incident radiation. The apparatus further includes means for sensing the magnitude of charge remaining on the capacitor of a given photosensitive element a preselected period of time after its charging by the conductive means, so as to produce a signal corresponding to the time integral of the magnitude of the incident radiation impinging on the photoresponsive means connected to that capacitor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.