Image-writing device and method and image-forming apparatus reducing dot width variations in relation to a screen angle
US6897982B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2000 |
| Grant date | May 24, 2005 |
| Priority date | — |
| Expiry date | Jul 18, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K15/1209
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An image-writing device writes a dot image onto an image-receiving body in such a way that the dots align at a certain screen angle. The dots are written by an array of writing elements such as light-emitting diodes. The image-writing device has a memory that stores compensation parameters that compensate for non-uniformity of the writing elements. The compensation parameters are also calculated to produce dots with approximately uniform widths as viewed in the screen-angle direction. When driven according to the compensation parameters, the writing elements produce a dot image that is comparatively free of dot-width irregularities aligned in the screen-angle direction, which is the direction in which such irregularities are most noticeable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.