Flying spot scanner burn corrector with dual photomultiplier sampling and mismatch signal suppression
US5280166A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1991 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | Nov 18, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/11
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Two photomultipliers (14,16) are arranged one on either side of a CRT (10) primary optical axis adjacent the imaging lens. High frequency components of the detected CRT brightness signal from the two photomultipliers are applied to the "gate" 32. When the signals are equal, one or other of the signals will be selected by the "gate". When the signals are unequal, the lower one will be rejected. Thus signals caused by faceplate (22) dirt are eliminated, since they appear displaced in time from the photomultipliers, due to the spacing of the dirt from the scanning beam and the spacing of the photomultipliers. Phosphor grain and blemish signals occur at the outputs of the photomultipliers simultaneously and are allowed through the "gate" to provide correction and attenuation of these unwanted signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.