Patent ID: 8529043
Filing Date: 2013-09-10
Classification: B41J

Abstract:
1. A printing apparatus that forms an image with dots of metallic ink including a metallic pigment and dots of color ink including a color pigment on a printing medium such that the dots of metallic ink develop color of the metallic pigment on the printing medium and the dots of the color ink develop color of the color pigment on the printing medium, at least some of the dots of the color ink being superimposed on the dots of the metallic ink, or the dots of the metallic ink being superimposed on at least some of the dots of the color ink, the printing apparatus comprising: a head having at least one metallic ink nozzle that ejects the metallic ink and at least one color ink nozzle that ejects the color ink; a transport mechanism that transports the printing medium relative to the head; and a print control section that controls the head and the transport mechanism, thereby printing the image on the printing medium using the metallic ink and color ink, and a main scanning mechanism that drives the head in a main scanning direction perpendicular to the direction in which the printing medium is transported, wherein the at least one metallic ink nozzle and the at least one color ink nozzle are offset from each other along the direction in which the printing medium is transported and are arranged in the order in which the dots of metallic ink and dots of color ink are superimposed; wherein the head has at least one nozzle row for the metallic ink and at least one nozzle row for the color ink, each nozzle row including a plurality of nozzles arranged in the direction in which the printing medium is transported, some of the nozzles in the at least one nozzle row for the metallic ink are used as the at least one metallic ink nozzle and form a metallic ink nozzle group, some of the nozzles in the at least one nozzle row for the color ink are used as the at least one color ink nozzle and form a color ink nozzle group, and the metallic ink nozzle group and the color ink nozzle group are offset from each other along the direction in which the printing medium is transported and are arranged in the order in which the dots of metallic ink and the dots of color ink are superimposed; wherein the head has a larger number of nozzle rows for the metallic ink than nozzle rows for the color ink; wherein the print control section makes the manner of dot formation in an area in which printing is performed using the metallic ink different from the manner of dot formation in an area in which printing is performed using the color ink; wherein the print control section is capable of superimposing scanning in which the main scanning mechanism makes the head perform main scanning a plurality of times to form a raster of dots; and wherein the print control section makes the number of times of main scanning in forming a raster of dots using the metallic ink smaller than the number of times of main scanning in forming a raster of dots using the color ink.