Method and apparatus for compensating for image misalignment...

Details Method and apparatus for compensating for image misalignment... Method and apparatus for compensating for image misalignment...

2007-03-06

2007-03-06

Tran, Huan (Department: 2861)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

C347S235000

Reexamination Certificate

active

11000835

ABSTRACT:
A bi-directional electrophotographic raster imaging system that sweeps a modulated light beam across an imaging region of a photosensitive surface to create both forward-going and reverse-going scanlines of dot data on the imaging region, and which compensates for image misalignment that may be caused by varying the power used to drive a laser light source that generates the modulated light beam. An SOS photosensor detects the beginning of each scanline in both forward and reverse directions, outputting an SOS signal used to create both forward and reverse margins. When the laser power is varied, compensating data is used to correct the forward and reverse margins to keep them aligned (straight), even though the beginning of the scanline locations for both forward and reverse scans are affected in opposite directions by an increase or decrease in laser power.

REFERENCES:
patent: 5966231 (1999-10-01), Bush et al.
patent: 2005/0134679 (2005-06-01), Paterson et al.
patent: 2006/0064019 (2006-03-01), Bush et al.

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