Compensation of MPA polygon once around with exposure...

Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic

Reexamination Certificate

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C358S001900, C347S232000

Reexamination Certificate

active

07492381

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.

REFERENCES:
patent: 4257053 (1981-03-01), Gilbreath
patent: 5737006 (1998-04-01), Wong
patent: 5966231 (1999-10-01), Bush et al.
patent: 2003/0063183 (2003-04-01), AuYeung et al.
patent: 2005/0275855 (2005-12-01), Mizes et al.

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