Patent ID: 7980649

Claim:
An ink jet printing apparatus for printing an image on a printing medium by using a printing head having a plurality of arrays each having a plurality of ink ejection openings arranged in an arrangement direction, the apparatus comprising: a moving device that performs a relative movement of the printing medium and the printing head, by moving the printing head in a direction intersecting with the arrangement direction of the ink ejection openings; and a printing device for printing an image during the relative movement by using ink ejection openings from at least one of two arrays adjacent to each other along the direction intersecting with the arrangement direction of the ink ejection openings, where a number of ink ejection openings used for printing is changed in accordance a type of the printing medium, wherein when the printing medium is a first type of printing medium, having a generation amount of a scattering substance produced when an image is printed thereon smaller than a second type of printing medium, the number of ink ejection openings used by the printing device is more than when the printing medium is the second type of printing medium, and wherein the printing device prints by using the ink ejection openings in both of the two arrays during the relative movement when the printing medium is the first type of printing medium, and prints by using the ink ejection openings in one of the two arrays during the relative movement when the printing medium is the second type of printing medium.