Systems and methods for alignment of laser printers
US8289358B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 2011 |
| Grant date | Oct 16, 2012 |
| Priority date | — |
| Expiry date | Feb 25, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0435
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Laser printers are plagued with an assortment of alignment issues. In color laser printers the issues are exacerbated. Variations in distance from the mirror to the drum can lines in different color planes to vary in size. Variations in angles in the facets of the mirror can cause alignment issues between lines. Even lack of synchronization between the dot clock and start of line indication can cause misalignment between rows. In addition, a cosine distortion occurs due to the non-constant linear velocity of the laser scan of a single line. A very high speed master clock can drive the laser scanning unit. By using a very high speed clock, the control circuitry has the resolution to compensate for many of these distortion types, by appropriately counting clock cycles and indicating such to the laser modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.