Patent ID: 6820957
Filing Date: 2004-11-23
Classification: B41J

Abstract:
A printhead having a plurality of heating elements and a driving circuit for electrifying and driving the heating elements, comprising:a shift register adapted to serially input digital data supplied from an external unit, and retain the digital data; counting means for counting a clock signal and outputting a counted value; comparison means for comparing time-length data, included in the digital data, with the counted value outputted by said counting means, and outputting a match signal when a match is found; and driving signal generation means for enabling a driving signal in response to a driving start signal supplied from an external unit, and disenabling the driving signal in accordance with the match signal outputted based on the counted value counted by said counting means in response to the driving start signal, wherein the driving circuit electrifies and drives the heating elements based on the driving signal from said driving signal generation means and print data.