Patent ID: 8186796
Filing Date: 2012-05-29
Classification: B41J

Abstract:
1. A substrate for an ink jet printhead comprising: a plurality of heaters that are used for generating energy for ink droplet discharge, wherein the plurality of heaters are divided into a plurality of groups; a plurality of switching elements each corresponding to each of the heaters and configured to determine an energization of each heater; and a plurality of logic circuits each corresponding to each of the switching elements, each of the logic circuits outputs a drive signal to each switching element for determining the energization of each heater; a print data circuit that outputs a print data signal to the plurality of logic circuits, wherein the same print data signal is input to the logic circuits corresponding to one group; a block selection circuit that outputs block selection signal to the plurality of logic circuits, for time-divisionally driving each of heaters in a group in different timings; and a selection circuit that outputs the same selection signal to all of the logic circuits, wherein the selection circuit outputs the selection signal which is HIGH in an annealing process mode and outputs the selection signal which is LOW in a normal print mode, and wherein each of the logic circuits includes: a first driver circuit that calculates a logical product of the print data signal, the block selection signal and inversion signal of the selection signal; and a second driver circuit that calculates a logical product of the print data signal and the selection signal.