Patent ID: 7063400
Filing Date: 2006-06-20
Classification: G06K

Abstract:
1. A printing apparatus comprising: a print head for scanning over a printing medium in a predetermined direction, said print head comprising a printing element set comprising M printing elements for selectively forming dot images on said printing medium, wherein M is a positive integer; a timing device for, in response to a reference timing sequence and a random value series, generating N sets of driving timing sequences, said random value series including N random values, each of the N sets of driving timing sequences being obtained by shifting said reference timing sequence with corresponding one of N random values, wherein N is a positive integer; and a driving device for, in response to said N sets of driving timing sequences, forming said dot images, wherein each set of driving timing sequences sequentially drives the M printing elements to provide random distances in the predetermined direction between centers of consecutive dot images formed by the printing element set of the printing head.