Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Reexamination Certificate
2005-12-21
2009-02-17
Shah, Manish S (Department: 2853)
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
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.
Goodman Nancy B.
LeStrange Jack
Mizes Howard
Paul Peter
Viturro R. Enrique
Al-Hashimi Sarah
Krukar Richard H.
Lopez Kermit D.
Ortiz Luis M.
Shah Manish S
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