Modulator for doubling resolution in the fast-scan direction for a laser imager in an electrophotographic printer
US5790166A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 17, 1997 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Jul 17, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K15/1219
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A modulator circuit for use in driving a laser in an electrophotographic laser printer starts with a standard, inexpensive low-frequency pixel clock for timing the modulation of the laser to form an image, and effectively doubles the modulation frequency, thereby allowing spatial resolution to be doubled in the fast-scan direction. An original, low-frequency pixel clock is split, one of the split signals is delayed by a predetermined amount, and the original and delayed pixel clocks are applied to an exclusive OR gate. The modulator of the present invention functions without either a high-frequency original pixel clock or a phase-locked loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.