Multi-phase pixel clock for a raster output scanner (ROS) printer
US5485195A · kind A · utility
10Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 21, 1993 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Jun 21, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Fast scan jitter in a ROS scanning system is substantially reduced by use of a multi-phase clock derived from a crystal oscillator. The rising edge of a start-of-scan signal is compared to the clock signal and the phase of that clock signal which is next in time to the SOS signal is used for that scan. For one example given, the scan-to-scan jitter is limited to within 1/8 the pixel period with even higher levels of accuracy possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.