Patent ID: 6293640
Filing Date: 2001-09-25
Classification: B41J

Abstract:
A printing apparatus having a printer head which scans a recording material in a main scanning direction to thereby print an image, said apparatus comprising:N recording elements arranged on said printer head in a sub-scanning direction perpendicular to said main scanning direction at intervals of K dots such that K/N is an irreducible fraction, anda printer driving circuit operatively configured, programed and connected to said recording elements and said printer head;wherein, when printing is executed by driving said recording elements while effecting an interlaced scanning with said printer head for each predetermined dot interval, said N recording elements are divided into groups by said printer driving circuit, each group consisting of recording elements driven with the same timing, and a drive sequence for said groups is determined by said printer driving circuit such that the printing positions sequential with respect to the sub-scanning direction for N recording elements form a "">"" pattern on said recording material, and printing positions of recording elements of each of said groups being symmetric with respect to an axis of line of symmetry of the "">"" pattern and printing with said same timing.