Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1991-10-28
1993-09-28
Reinhart, Mark J.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
359217, H04N 121, B41J 247
Patent
active
052489973
ABSTRACT:
In a laser imaging apparatus including a multifaceted polygon scanner, a technique for correcting facet reflectance differences to effect uniform laser light power output for all scanner facets. A set of facet reflectance look-up tables are determined as follows. Determine the relative reflectance for each facet of the polygon scanner. Calculate gain factors referenced to the minimum relative reflectance. Determine the relationship between laser power and DAC code value for the minimum reflectance facet for a number of measured values. Calculate this relationship for all 2.sup.n DAC code values to produce a look-up table for the minimum reflectance facet. Shift the laser powers by the relative reflectance for each other facet of the polygon scanner and back calculate the DAC code values that would yield the same laser powers as the minimum reflectance facet to produce look-up tables for the other facets.
REFERENCES:
patent: 4204233 (1980-05-01), Swager
patent: 4257053 (1981-03-01), Gilbreath
patent: 4320420 (1982-03-01), Rider
patent: 4717925 (1988-01-01), Shibata et al.
patent: 4733064 (1988-03-01), Ishikawa
patent: 4833488 (1989-05-01), Byung-Sik
patent: 4884083 (1989-11-01), Loce et al.
Eastman Kodak Company
Noval William F.
Reinhart Mark J.
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