# US 8,770,718 B2 · Inkjet printer having switched firing of adjacent nozzles applying common color > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,718 B2 - Document ID: US8770718B2 - Status: Granted - Kind: B2 - Application number: 12/098,812 - Filed: 2008-04-07 - Published: 2008-10-09 - Granted: 2014-07-08 - Earliest claimed: 2007-04-05 - Assignees: Marvell World Trade Ltd. - Applicants: Gregory F. Carlson; Steven Goss - Inventors: Gregory F. Carlson; Steven Goss - Web page: https://patentgrep.com/patent/US8770718B2 ## CPC - B41J 2/07: characterised by jet control (B41J2/205 takes precedence) - B41J 2/2132: {Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding (methods for local corrections by dot omission, image edge enhancement, or multi-pass mask selection G06K15/102; colour conversion H04N1/40)} - B41J 2/2139: {Compensation for malfunctioning nozzles creating dot place or dot size errors (generating single droplets or particles on demand by pressure, e.g. electromechanical transducers B41J2/045)} - B41J 29/13: Cases or covers - B41J 29/38: Drives, motors, controls or automatic cut-off devices for the entire printing mechanism - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract A printing system includes a printhead having adjacent inkjet nozzles for dispensing a common colored ink and a controller adapted to direct firing of the adjacent inkjet nozzles so that adjacent local areas using the common colored ink are printed on a printing medium with alternate firings of the adjacent inkjet nozzles. ## Claims ### Claim 1 A printing system comprising: an array of nozzles forming a printhead including a first inkjet nozzle and a second inkjet nozzle, aligned in a column direction, that comprise a nozzle pair, wherein the nozzle pair is arranged such that the second inkjet nozzle is the closest inkjet nozzle to the first inkjet nozzle in the column direction and the first inkjet nozzle and the second inkjet nozzle are configured to dispense a common colored ink; wherein the image data is such that the first inkjet nozzle and the second inkjet nozzle are arranged in a logical pair for a local region of the image, wherein the length of the local region in the column direction is less than the length of the nozzle array that forms the printhead; a controller configured to implement a printing process comprising: receiving the image data, and alternating an activation of the first inkjet nozzle and the second inkjet nozzle with respect to the local region such that both the first inkjet nozzle and the second inkjet nozzle are activated to print the image date within the local region during the printing process. ### Claim 2 (depends on 1) The printing system of claim 1, where the printhead comprises multiple sets of adjacent inkjet nozzles dispensing different colored inks, and where each set of adjacent inkjet nozzles dispenses a common colored ink. ### Claim 3 (depends on 1) The printing system of claim 1, where the printhead is a sweeping printing head that is movable with respect to the printing medium. ### Claim 4 (depends on 1) The printing system of claim 1, where the printhead comprises multiple configurations of adjacent inkjet nozzles dispensing different colored inks, and where each configuration of adjacent inkjet nozzles dispenses a common colored ink. ### Claim 5 (depends on 1) The printing system of claim 1, where each configuration of adjacent inkjet nozzles comprises a pair of adjacent inkjet nozzles. ### Claim 6 (depends on 1) The printing system of claim 1, wherein the printing medium is advanced during the printing process and the activation of the first inkjet nozzle and the second inkjet nozzle are alternated during the printing process. ### Claim 7 (depends on 1) The printing system of claim 1, wherein the controller is configured to alternate the activation of the first inkjet nozzle and the second inkjet nozzle in increments of columns of image data. ### Claim 8 A method for operating a printing system comprising: receiving image data; selecting, as part of a printing process, from an array of nozzles forming a printhead, a first inkjet nozzle and a second inkjet nozzle, aligned in a column direction, to form a nozzle pair of inkjet nozzles for printing at least a portion of the image data, wherein the nozzle pair is arranged such that the second inkjet nozzle is the closest inkjet nozzle to the first inkjet nozzle in the column direction; arranging the image data such that the first inkjet nozzle and the second inkjet nozzle form a logical pair for a local region of the image, wherein the length of the local region in the column direction is less than the length of the nozzle array that forms the printhead; activating, as part of the printing process for the local region, the first inkjet nozzle to print the portion of the image data on a printing medium while the second inkjet nozzle is in a non-activated state; and alternating, as part of the printing process for the local region, an activation of the nozzle pair by switching the first inkjet nozzle to the non-activated state and activating the second inkjet nozzle to print the portion of the image data on the printing medium, such that both the first inkjet nozzle and second inkjet nozzle are activated to print the portion of the image data during the printing process for the local region. ### Claim 9 (depends on 8) The method of claim 8, further comprising logically arranging adjacent inkjet nozzles in pairs for activation. ### Claim 10 (depends on 8) The method of claim 8, further comprising activating multiple configurations of adjacent inkjet nozzles to dispense multiple colored inks, where each configuration of adjacent inkjet nozzles dispenses a common color. ### Claim 11 (depends on 8) The method of claim 8, further comprising activating multiple pairs of adjacent inkjet nozzles to dispense multiple colored inks, where each pair of adjacent inkjet nozzles dispenses a common colored ink. ### Claim 12 (depends on 8) The method of claim 8, wherein alternating the activation of the first inkjet nozzle and the second inkjet nozzle during the printing process is implemented in increments of columns of image data. ### Claim 13 (depends on 8) The method of claim 8, further comprising logically arranging adjacent inkjet nozzles into multiple configurations of adjacent inkjet nozzles, where each configuration of adjacent inkjet nozzles dispenses a common colored ink. ### Claim 14 A printing method comprising: dispensing ink in a printing process corresponding to image data using, from an array of nozzles forming a printhead, a first inkjet nozzle and a second inkjet nozzle aligned in a column direction, wherein the first inkjet nozzle and the second inkjet nozzle comprise a nozzle pair arranged such that the second inkjet nozzle is the closest inkjet nozzle to the first inkjet nozzle in the column direction; wherein the first inkjet nozzle and the second inkjet nozzle are arranged in a logical pair associated with a local region of the image, wherein the length of the local region is less than the length of the nozzle array that forms the printhead; activating, as part of the printing process for the local region, the first inkjet nozzle to dispense ink corresponding to the image data on a printing medium while the second inkjet nozzle is in a non-activated state; advancing the printing medium during the printing process; and alternating, as part of the printing process for the local region, an activation of the nozzle pair by switching the first inkjet nozzle to the non-activated state and activating the second inkjet nozzle to dispense ink corresponding to the image data on the printing medium, wherein both the first inkjet nozzle and the second inkjet nozzle are activated to print the image data during the printing process for the local region. ### Claim 15 (depends on 14) The print method of claim 14, wherein alternating the activation of the first inkjet nozzle and the second inkjet nozzle during the printing process is implemented in increments of columns of image data.