US 2006/0187247 A1Published application

Printing apparatus

AssigneeCanon Kabushiki Kaisha

InventorsKiichiro Takahashi, Naoji Otsuka, Osamu Iwasaki, Minoru Teshigawara, Tetsuya Edamura, Yoshinori Nakagawa, Satoshi Seki, Naomi Oshio

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Abstract

For a serial color ink jet printing apparatus that forms an image using a symmetric printing head that ejects large dots and small dots, the configuration of a printing head is provided for suppressing, to the extent possible, a cyclic fluctuation in the main scanning direction. According to the present invention, individual nozzle arrays are arranged so that two nozzle arrays, i.e., a cyan nozzle array c1 and a magenta nozzle array m1, that are located nearer each other, form dots on adjacent scan lines. With this arrangement, a high quality image, having neither an uneven density nor an uneven color, can be formed when a printing head is inclined, or when a cyclic shift in printing positions occurs, depending on the position of the main scanning direction.

Claims6

Dependent claims

A printing apparatus;

using a printing head, which includes
a plurality of printing element arrays, in each of which a plurality of printing elements providing color agents for a printing medium are arranged at a predetermined pitch in a predetermined direction, provided in accordance with color agent types and amounts of color agents to be provided,
and scanning the printing head in a direction differing from the predetermined direction to form an image on the printing medium,
wherein the printing head has, for at least two color agents, two printing element arrays for providing a color agent in the same color and in the same amount,
wherein the two printing element arrays corresponding to each of the two color agents are arranged at positions such that color orders are symmetrical in the scanning direction, and the two printing element arrays are shifted each other by half the predetermined pitch in the predetermined direction, and
wherein one of the two printing element arrays that provide one of the two color agents, and one of the two printing element arrays that provide the other color agent and that is located closer to the printing element array are arranged so as to be shifted by half the predetermined pitch in the predetermined direction.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/350,877Filed 10 Feb 2006
Priority: JP 2005-04424421 Feb 2005
Published: 24 Aug 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

B41J 19/147
With a reciprocating print head printing in both directions across the paper width: colour shift prevention
B41J 2/2125
Characterised by dot size, e.g. combinations of printed dots of different diameter: by means of nozzle diameter selection
B41J 2/2132
For multi-colour printing: print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
B41J
Typewriters