US Patent 8651614 Inkjet printing apparatus and ink discharge control method

In an inkjet printing apparatus, a printing medium is conveyed in a conveying direction by causing the printing medium to adsorb to the surface of the endless belt by electrostatic force. When printing, the surface potential of the printing medium directly below the printing head is acquired. The discharge speed of the ink that has been associated in advance with the acquired surface potential is obtained, and an amount of variation in the landing position of the ink is determined based on the scanning speed of the printing head, the distance from the printing head to the printing medium, and the discharge speed of the ink. The timing of discharge of ink from the printing head is corrected to cancel out the determined amount of variation, and printing is performed based on image data in accordance with the corrected timing.