Patent ID: 6695422
Filing Date: 2004-02-24
Classification: B41J

Abstract:
A printing device for printing images on a print medium while performing a main scan, comprising:a print head having a plurality of nozzles and a plurality of discharge drive elements for causing the plurality of nozzles to discharge ink droplets from; a main scan drive for performing bi-directional main scanning by moving at least one of the print medium and the print head; a sub-scan drive for performing sub-scanning by moving at least one of the print medium and the print head; a head drive for supplying drive signals to the discharge drive elements in accordance with print signals; and a controller for controlling printing operation, the head drive comprising: a common drive signal generator capable of selectively generating one of n types of common drive signals for each main scan where n is an integer of 2 or greater; a drive signal reshaping circuit for reshaping the common drive signal supplied from the common drive signal generator with respect to each pixel in accordance with the print signals, thereby generating the drive signals to be supplied to the discharge drive elements; and a recording position adjustment section for adjusting recording positions in the main scanning direction by employing positional difference adjustment values prepared in advance in order to reduce a difference between the recording positions in the main scanning direction, the positional difference adjustment values being prepared for combinations of common drive signals that are usable within one page of the print medium and that are selected from all possible combinations of common drive signals suitable for use in a forward main scanning pass and common drive signals suitable for use in a reverse main scanning pass.