| Patent application number | Description | Published |
|---|
| 20090142004 | Sub-raster registration using non-redundant overwriting - Sub-raster registration errors are compensated for through non-redundant overwriting. Data from adjacent rasters is written to a particular output raster so that the adjacent rasters share an influence at a point actually written to by a rendering device, thereby compensating for a sub-raster component of a registration error associated with writing to the particular point. If two writing passes per raster are used and the writing passes have equal influence (e.g., are written with equal power), then writing data from a first raster during a first pass and writing data from a second raster adjacent to the first raster during a second pass compensates for a sub-raster registration error of half a raster spacing. If two writing passes are associated with different influence (e.g., are written with ⅓ and ⅔ power respectively) and/or if additional writing passes are used, then addition sub-raster positions can be compensated for or emulated. | 06-04-2009 |
| 20100149599 | METHOD AND APPARATUS FOR SLOW SCAN MAGNIFICATION ADJUSTMENT USING NON-REDUNDANT OVERWRITING - A method of achieving process-direction sub-raster magnification adjustment using non-redundant overwriting. The raster imager provides overwriting while the image path provides non-redundant data for each pass according to the desired magnification adjustment. The same laser power level can be used for the multiple writes, or optionally, it may be varied to further improve spatial resolution of the adjustment. | 06-17-2010 |
| 20110061552 | SYSTEM AND METHOD FOR EQUALIZING MULTIPLE MOVING WEB VELOCITY MEASUREMENTS IN A DOUBLE REFLEX PRINTING REGISTRATION SYSTEM - A method enables linear web velocities generated with reference to angular velocity signals generated by encoders at different rollers in a double reflex printing registration system to be equalized. The method includes identifying a low frequency component of a first linear velocity of a moving web, identifying a high frequency component of a second linear velocity of the moving web, and computing a linear velocity for the moving web at a roller in a print zone with reference to the identified high frequency component of the second linear velocity and the identified low frequency component of the first linear velocity. | 03-17-2011 |
| 20110063355 | SYSTEM AND METHOD FOR COMPENSATING RUNOUT ERRORS IN A MOVING WEB PRINTING SYSTEM - A method compensates for runout errors in a web printing system. The method includes identifying runout error at a first roller driving a web of printable media, generating a runout compensation value corresponding to the identified runout error, identifying a velocity of the moving web with reference to encoder output corresponding to an angular velocity of the first roller and the generated runout compensation value, and delivering a firing signal to a print head proximate the first roller to energize the inkjet nozzles in the print head and eject ink onto the web at a position corresponding to the computed web velocity. | 03-17-2011 |
| 20110063357 | SYSTEM AND METHOD FOR COMPENSATING FOR REGISTRATION ERRORS ARISING FROM HEATED ROLLERS IN A MOVING WEB PRINTING SYSTEM - A method compensates for thermal expansion of rollers in a web print zone. The method includes receiving an angular velocity signal from a first encoder for a roller in a print zone of a moving web printing system, receiving a signal from a first temperature sensor corresponding to a temperature of the roller, modifying a first diameter for the first roller with a first predetermined distance in response to the temperature of the first roller being different than a first predetermined temperature, identifying a velocity of a moving web in the print zone of the moving web printing system with reference to the modified first diameter, and delivering a firing signal to a first printhead proximate the first roller to energize the inkjet nozzles in the first printhead and eject ink onto the web at a position corresponding to the identified moving web velocity. | 03-17-2011 |
| 20110175975 | APPARATUS FOR ALIGNMENT OF VIDEO CLOCK WITH THE ROS START OF SCAN SENSOR SIGNAL IN PRINTING SYSTEMS - Systems and methods are provided for aligning a video clock with the raster output scanner start-of-scan signal in printing systems. A system and method is proposed to align the pixel clock to an asynchronous reference signal generated in the raster output scanner. The proposed system and method adjusts a phase for a static phase value while performing a dynamic phase shifting for the start-of-scan signal alignment. | 07-21-2011 |
| 20110234737 | APPARATUS AND METHOD FOR DETERMINING BEAM DELAYS IN A PRINTING DEVICE - An apparatus ( | 09-29-2011 |
| 20110235946 | REDUCING BUFFER SIZE REQUIREMENTS IN AN ELECTRONIC REGISTRATION SYSTEM - What is disclosed is a novel system and method for reducing a size of a memory buffer used by an electronic registration correction system performing an electronic registration correction on a digital image. The present method uses column address segmentation to identify blocks of scanlines within a spatially mapped array of image pixels comprising a digital image. Advantageously, the present system and method reduces scanline buffer memory by a factor of 2 | 09-29-2011 |
