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US 8,576,458 B2Granted
Printing system, raster ouput scanner, and method with electronic banding compensation using facet-dependent smile correction
AssigneeXerox Corporation
InventorsRobert Herloski, Jack Lestrange, Timothy Clark, Jess Gentner, Edward W. Smith, Jr., Howard Mizes, Robert P. Loce, Beilei Xu, Joseph C. Sheflin
Life of this patent
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Abstract
Raster Output Scanners and printing systems are presented along with methods for mitigating banding in printing systems, in which electronic banding compensation is employed using cross-process direction light source intensity banding correction profiles tailored to corresponding reflective facets of a rotating polygon.
Claims14
A raster output scanner (ROS) for generating an image on a portion of a photoreceptor traveling along a process path past the ROS, comprising:
- at least one light source operative to generate a light output;
- a driver operative to selectively actuate the at least one light source according to image data to produce at least one modulated light output;
- a motor polygon assembly comprising a rotating polygon with a plurality of reflective facets individually operative to scan the at least one modulated light output of the at least one light source directly or indirectly to a photoreceptor of a printing system along a fast scan direction to generate an image on at least a portion of the photoreceptor according to the image data;
- and
- a controller operatively coupled with the driver to cause the driver to selectively vary an output level of the at least one modulated light output provided by the at least one light source during scanning by a given reflective facet of the rotating polygon to mitigate banding according to a given one of a plurality of banding correction profiles that corresponds to the given reflective facet.
2 more elements
A document processing system, comprising:
- at least one marking device operative to transfer marking material onto an intermediate medium;
- a transfer station positioned proximate a travel path of the intermediate medium and operative to transfer the marking material from the intermediate medium to a printable media;
- and
- a raster output scanner (ROS) operatively associated with the at least one marking station to generate an image on a portion of the intermediate medium traveling along a process path past the ROS, the ROS comprising:
- at least one light source operative to generate a light output,
- a driver operative to selectively actuate the at least one light source according to image data to produce at least one modulated light output,
- a motor polygon assembly comprising a rotating polygon with a plurality of reflective facets individually operative to scan the at least one modulated light output of the at least one light source directly or indirectly to a photoreceptor of a printing system along a fast scan direction to generate an image on at least a portion of the photoreceptor according to the image data,
- a controller operatively coupled with the driver to cause the driver to selectively vary an output level of the at least one modulated light output provided by the at least one light source during scanning by a given reflective facet of the rotating polygon to mitigate banding according to a given one of a plurality of banding correction profiles that corresponds to the given reflective facet, and
- an encoder providing an indication to the controller of the identity of the given reflective facet of the rotating polygon,
- wherein the controller is operative to select the given one of the plurality of banding correction profiles that corresponds to the given reflective facet according to the indication from the encoder.
7 more elements
A method for mitigating banding in a printing system, the method comprising:
- selectively actuating at least one light source according to image data to produce at least one modulated light output;
- using a given one of a plurality of reflective facets of a rotating polygon, scanning the at least one modulated light output of the at least one light source directly or indirectly to a photoreceptor of a printing system along a fast scan direction to generate an image on at least a portion of the photoreceptor according to the image data;
- and
- selectively varying an output level of the at least one modulated light output provided by the at least one light source during scanning by the given reflective facet according to a given one of a plurality of facet-specific banding correction profiles that corresponds to the given reflective facet.
1 more element
Dependencies are inferred from the claim text.