Image forming apparatus and density unevenness preventing...

Details Image forming apparatus and density unevenness preventing... Image forming apparatus and density unevenness preventing...

2007-03-13

2007-03-13

Feggins, K. (Department: 2861)

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

Reexamination Certificate

active

11048847

ABSTRACT:
A system controller of a color thermal printer obtains a density profile of an image with respect to a feeding direction of a color thermal recording paper based on density of a test print measured by a CCD line sensor, and then extracts a density unevenness component, which fluctuates periodically, from the density profile. The system controller relates the density unevenness component in one period to a rotating position of a feed motor so as to create a period profile of a driving pulse to offset the unevenness component. When recording the image, the driving pulse is given to the feed motor based on the period profile, so that the drive of the feed motor is controlled.

REFERENCES:
patent: 4990930 (1991-02-01), Ludden et al.
patent: 6034707 (2000-03-01), Agano
patent: 6249299 (2001-06-01), Tainer
patent: 5-220946 (1993-08-01), None
patent: 6-54150 (1994-02-01), None

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