摘要:
An ink-jet printing apparatus and an ink-jet printing method allow the printing of an image with a high quality without causing the change in ink color coming out on the printing medium with keeping the printing conditions constantly regardless of changing the number of nozzles to be printed and the amount of transferring the printing medium, for example, by restricting the number of nozzles to be used in the printing, which belong to a nozzle row (Bk) located on an upstream side in the sub-scan direction (Y) before changing the amount of transferring the printing medium (P); and restricting the number of nozzles to be used in the printing, which belong to the nozzle rows (Y1, Y2, M1, M2, C1, C2) located on a downstream side in the sub-scan direction (Y), after changing the amount of transferring the printing medium (Y).
摘要:
A liquid ejection head (13) according to the present invention comprises a single liquid supplying port (18) to which a liquid is supplied, a plurality of liquid supplying passages (17a and 17b) having one end in communication with the liquid supplying port (18), a plurality of common liquid chambers (16a and 16b) that are in communication with the other ends of the liquid supplying passages (17a and 17b), respectively, and a plurality of ejection port groups which are in communication with the common liquid chambers (16a and 16b) via liquid channels and from which liquid droplets are ejected. A cross sectional area or length of the liquid supplying passage (17a) in communication with the ejection port group having a larger sum of opening areas of the ejection ports is set smaller or longer respectively than that of the liquid supplying passage (17b) that is in communication with the ejection port group having a smaller sum of opening areas of the ejection ports.
摘要:
A liquid ejection head (13) according to the present invention comprises a single liquid supplying port (18) to which a liquid is supplied, a plurality of liquid supplying passages (17a and 17b) having one end in communication with the liquid supplying port (18), a plurality of common liquid chambers (16a and 16b) that are in communication with the other ends of the liquid supplying passages (17a and 17b), respectively, and a plurality of ejection port groups which are in communication with the common liquid chambers (16a and 16b) via liquid channels and from which liquid droplets are ejected. A cross sectional area or length of the liquid supplying passage (17a) in communication with the ejection port group having a larger sum of opening areas of the ejection ports is set smaller or longer respectively than that of the liquid supplying passage (17b) that is in communication with the ejection port group having a smaller sum of opening areas of the ejection ports.
摘要:
Two sets of recording heads for applying ink of cyan (C), magenta (M), and yellow (Y) are arranged in symmetry in a scanning direction and orders of colors C and M ejected onto a pixel of a secondary color are set to symmetric orders (C → M and M → C). This makes the application orders of ink symmetric in each pixel of secondary color and thus there is no difference between application orders in formation of the pixel by either forward or backward scanning, whereby occurrence of uneven color due to the application orders of ink can be reduced even in execution of two-way color print.
摘要:
A first printing pattern is formed for a patch (350) by means of a paper feed upstream side part (311) of a black head (310). Then, a second printing pattern is formed for the patch (350) by means of a cyan head (321) in the following scans, and density of the patch (350) is read by a reflection optical sensor (30) in a scan after the completion of both patterns.
摘要:
A plurality of patterns (SP1 to SP8) respectively having different area factor of dot formation area are formed by forward and reverse scanning printing of a print head (1), and then optical characteristics of the plurality of formed patterns are measured. A function representing the relationship between the printing position offset between the forward and reverse printings is determined from the optical characteristics. Then, respective pattern (PM, PF, PS) having a predetermined area factor of dot formation area is formed by means of forward and reverse scanning where the speed is differentiated according to the mode of a printing apparatus, and then the optical characteristics of this pattern is measured. By applying this measured optical characteristics to the function, an adjustment value of the dot formation position conditions between the forward and reverse scans is obtained for each mode. This makes it easy to perform printing registration in a printing apparatus in the case of printing by a forward and reverse scan of a printing head or in the case of printing by means of a plurality of printing heads. In this case, operations by a user etc. are also unnecessary and are easily performed.
摘要:
In a complimentary printing by bi-directional scanning of a head (1) or by a plurality of heads, a plurality of patterns in which a print start timing is shifted by a predetermined amount are printed with respect to a reference dot formed by the forward scan of the bi-directional scanning or by one of the plurality heads (S1). In these patterns, an area factor by the dots formed by printing of the patterns is designed to be varied depending upon shifting amount. An average density is read from each of the plurality of patterns, optically (S2). The timing at which the maximum one among average densities read from the patterns is obtained, can be set as the printing registration condition (S3). Further, before the above reading operation, an optical sensor used for this operation is calibrated, for improving accuracies of the reading and the registrating. By these processings, printing registration between a forward and a reverse scan of a print head or printing registration between a plurality of print heads in a printing apparatus can be performed simply and with high accuracy.
摘要:
A first printing pattern is formed for a patch (350) by means of a paper feed upstream side part (311) of a black head (310). Then, a second printing pattern is formed for the patch (350) by means of a cyan head (321) in the following scans, and density of the patch (350) is read by a reflection optical sensor (30) in a scan after the completion of both patterns.
摘要:
In complementarily printing by bi-directional scannings of a head (1) or by a plurality of print heads, first patterns (pattern (a)) and second patterns (pattern (b)) including reference dots for example, dots formed by a forward scan of the bi-directional scannings or by one of the plurality of print heads and dots each having the different direction of shifting of relative printing positions to the reference dots are printed in corresponding to the plurality of shifting amounts. These first and second patterns have the similar characteristics of a change in density. The difference is only that their characteristics in density change are inverted according to the direction of shifting. The intersection point of these two characteristics in density change is obtained as a position for adjustment where dot-formed positions match. This makes it easy to perform printing registration in a printing apparatus in the case of printing by a forward and reverse scan of a printing head or in the case of printing by means of a plurality of printing heads. In this case, operations by a user etc. are also unnecessary and are easily performed.