Systems and methods for controlling polygon induced banding
AssigneeXerox Corporation
InventorsRobert Herloski, Martin Pepe
Life of this patent
Estimating the term…
Abstract
Systems and methods for reducing the degradation of image quality due to banding in an image processing system by detection of both integrated intensity and peak intensity of a laser beam reflected from the polygon mirror facet(s) of a motor polygon assembly. A banding detector is adapted to enable measurement of peak intensity and integrated intensity of the laser beam(s) reflected from the polygon mirror facet(s). Polygon facet induced banding can be determined from the measurements and can be used for sorting/manufacturing raster output scanners and/or compensating for the induced banding.
Claims20
A system for controlling image quality banding in an image processing system, the system comprising:
- a motor polygon assembly for an image processing system, said assembly comprising a rotatable polygon mirror and a motor for rotating said polygon mirror, said polygon mirror having at least one facet for reflecting at least one laser beam illuminating said polygon;
- at least one laser beam for illuminating on said facet(s);
- and
- a banding detector adapted to enable measurement of peak intensity and integrated intensity of said laser beam(s) reflected from said facet(s).
A method for controlling image quality banding in an image processing system, the method comprising:
- generating at least one laser beam;
- providing a motor polygon assembly with a polygon mirror having at least one facet for sweeping said laser beam(s);
- rotating said polygon mirror;
- reflecting said laser beam(s) from said polygon facet(s);
- and
- detecting peak intensity and integrated intensity of said reflected laser beam(s).
A raster output scanner comprising:
- at least one laser beam;
- a data source and laser driver for generating said at least one laser beam;
- a scan detection circuit operably connected to said laser driver for producing a start of scan signal;
- a motor polygon assembly comprising a rotatable polygon mirror and a motor for rotating said polygon mirror, said polygon mirror having at least one facet for reflecting said at least one laser beam illuminating said polygon;
- a banding detector adapted to enable measurement of peak intensity and integrated intensity of said laser beam(s) reflected from said facet(s);
- and
- a photoreceptor for receiving illumination from said at least one laser beam reflected from said facet(s).
Dependencies are inferred from the claim text.