Patent ID: 6273550
Filing Date: 2001-08-14
Classification: B41J

Abstract:
An inset printer, comprising:an inkjet head having a plurality of nozzles arrayed in the main scan direction, each for firing a different color ink; andhead control means for driving said inkjet head relative to a print medium in the main scan direction and the sub scan direction perpendicular to the main scan direction and for providing said inkjet head with firing pulses to fire inks in synchronization with said driving said inkjet head, in which droplets of said inks fired from said nozzles for respective colors are overlapped at each dot-forming position on said print medium to form a color image,wherein said inkjet head comprises six head-segment arrayed in the main scan direction, each head-segment having a plurality of nozzles arrayed at different locations in said sub scan direction, said six head-segments comprising two inside head-segments for firing two different mid-bright color inks locate on the inside of The six head-segments and two pair of outside head-segments being located on opposite sides of said to inside head-segments, said each outside pair of head-segments firing the darkest and brightest color inks, respectively, andsaid control means provides said inkjet head with said firing pulses in such a manner that a combination of said six head-segments in case of said inkjet head traveling on a first directional pass in the main scan direction differs from that in case of said inkjet head traveling on a second directional pass opposite to said first directional pass and such that said inks are fired onto one dot-forming position from said nozzles in the order darkest color ink, the mid-bright color ink and the brightest color ink in both cases of said first and second directional passes.