Patent ID: 6352329
Filing Date: 2002-03-05
Classification: B41J,G06K,H04N

Abstract:
An ink jet recording apparatus comprising:an ink jet head formed by integrally arranging a plurality of head units each having a large number of ink outlet ports aligned, so that the ink outlet ports in each of the head units can be arranged approximately parallel; a pseudo-halftone processing unit for converting an image signal of M gradation into an image signal of N (M>N) gradation by using dither matrix, so that average optical density of an image area formed in accordance with an image signal corresponding to P (P&gE;1) number of ink outlet ports at each end portion of the head units constituting the ink jet head can be substantially equivalent to average optical density of an image area formed in accordance with an image signal corresponding to ink outlet ports other than the P number of ink outlet ports; and driving means for driving the ink jet head in accordance with the image signal of N gradation that is output from the pseudo-halftone processing unit, while moving a recording medium in a direction orthogonal with a line direction in which the ink outlet ports of the ink jet heads are aligned, relatively to the ink jet head.