Raster input scanner (RIS) with diagnostic mode to predict and verify illumination optical performance
US5170267A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1990 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Sep 28, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/044
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A diagnostic test process is provided for a visual verification of the spatial illumination characteristics of an illumination system used in a raster input scanner (RIS) system. A calibration reference strip is illuminated by the RIS scanning lamp and the reflected image is detected by a photosensor array. The output data from the photosensor is sampled at predetermined time intervals with each sampling being displayed as a video illumination profile at a display screen. The profile is superimposed on a calibration grid with indicia which allow verification that the lamp calibration is still valid. An out of spec calibration display prompts an operator or tech rep to initiate a recalibration routine or to replace the lamps or possibly clean the optical system components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.