Compensation of MPA polygon once around with exposure modulation
US7492381B2 · kind B2 · utility
14Cited by
3References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2005 |
| Grant date | Feb 17, 2009 |
| Priority date | — |
| Expiry date | Mar 2, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/127
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Many xerographic machines have a motor polygon assembly (MPA), which is a rotating polygonal mirror. As the MPA rotates, it reflects a modulated light beam to produce scan lines on a photoreceptor. Inconsistencies in the MPA can cause inconsistencies in the scan lines, and therefore banding in a printed document. Misalignment, improper mounting, improper manufacture, or sources can cause the MPA inconsistencies. The banding is periodic, can be measured and can be compensated for. Although the modulated light beam can be modulated by many sources, further modulation using a compensation source can reduce banding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.