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US 8,525,857 B2Granted
System and method to improve side 1 to side 2 image on paper magnification difference and IQ performance
AssigneeXerox Corporation
InventorsJonathan B. Hunter, Andrew James Bonacci, David Mark Kerxhalli
Life of this patent
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Abstract
Document processing systems and duplex printing methods are presented in which side 1 to side 2 image on paper (IOP) magnification errors are mitigated by use different speeds for raster output scanner (ROS) for scanning images for different final print sides, and by selective use of electronic registration adjustment by adding or removing sub-pixels from the image data to compensate for ROS speed change overshoot or undershoot.
Claims20
A document processing system, comprising:
- a photoreceptor that continuously moves along a closed path;
- a plurality of raster output scanners (ROSs) located along the closed path of the photoreceptor, the ROSs individually operable to generate a latent image on a portion of the photoreceptor based on a clock input;
- a first clock providing a first clock output signal to the ROSs;
- a second clock providing a second clock output signal to the ROSs, the second clock output signal being or representing a higher frequency than the first clock output signal;
- a plurality of developers individually located downstream of a corresponding one of the ROSs and individually operable to develop toner of a given color on the latent image on the photoreceptor;
- a transfer station located along the closed path downstream of the ROSs and operative to transfer the developed toner from the photoreceptor to a substrate traveling along a first substrate path;
- a fusing station for fixing the transferred toner to the substrate;
- a duplex router receiving the substrate from the fusing station and operative to selectively direct the substrate along a second path;
- a media inverter located along the second path and operative to invert the substrate and to return the inverted substrate to the first path upstream of the transfer station;
- a controller coupled with the ROSs to selectively operate a given ROS according to the first clock signal if the latent image being generated by the given ROS is to be rendered on a first side of the substrate or according to the second clock signal if the latent image being generated by the given ROS is to be rendered on a second side of the substrate;
- and
- an electronic registration adjustment component operatively coupled with the controller to selectively add or remove at least one sub-pixel to or from image data associated with a given image.
9 more elements
A printing method, comprising:
- receiving image data for a print job page associated with a next photoreceptor panel zone portion of a photoreceptor that continuously moves along a closed path;
- determining if the latent image being generated is to be rendered on a first side or a second side of a substrate;
- selecting a first clock speed for operation of a raster output scanner (ROS) if the latent image is to be rendered on the first side of the substrate;
- selecting a second clock speed for operation of the ROS if the latent image is to be rendered on the second side of the substrate;
- selectively adding at least one sub-pixel to the image data for the next photoreceptor panel zone portion if the image data for the next photoreceptor panel is to be rendered on the second side of the substrate and the image data for the previous photoreceptor panel zone portion was to be rendered on the first side of the substrate;
- and
- selectively generating a latent image on the next panel zone portion of the photoreceptor according to the image data for the next photoreceptor panel using the selected clock speed.
4 more elements
A printing method, comprising:
- receiving image data for a print job page associated with a next photoreceptor panel zone portion of a photoreceptor that continuously moves along a closed path;
- determining if the latent image being generated is to be rendered on a first side or a second side of a substrate;
- selecting a first clock speed for operation of a raster output scanner (ROS) if the latent image is to be rendered on the first side of the substrate;
- selecting a second clock speed for operation of the ROS if the latent image is to be rendered on the second side of the substrate;
- selectively adding at least one sub-pixel to the image data for the next photoreceptor panel zone portion if the image data for the next photoreceptor panel is to be rendered on the first side of the substrate and image data for the previous photoreceptor panel zone portion was to be rendered on the first side of the substrate;
- and
- selectively generating a latent image on the next panel zone portion of the photoreceptor according to the image data for the next photoreceptor panel using the selected clock speed.
4 more elements
Dependencies are inferred from the claim text.