Patent ID: 7775620
Filing Date: 2010-08-17
Classification: B41J

Abstract:
1. A substrate for an ink jet recording head, the substrate provided with electrothermal transducers for generating thermal energy used for discharging ink and a driving circuit for driving the electrothermal transducers, the substrate comprising: a logic circuit for outputting, at a second voltage amplitude level based on an input signal of a first voltage amplitude level, selection signals for designating the electrothermal transducers to be driven, wherein the second voltage amplitude level is higher than the first voltage amplitude level, and the selection signals comprise block selection signals and device selection signals so as to time-divisionally drive the electrothermal transducers in units of blocks and each of the block selection signals is commonly used for driving of electrothermal transducers in one block, a gate circuit for inputting the selection signals of the second voltage amplitude level from the logic circuit and outputting driving signals of the second voltage amplitude level, each of which corresponds to each of the electrothermal transducers, a driving circuit for driving the electrothermal transducers based on the driving signals from the gate circuit, and a buffer circuit which has current supply capability of driving all gates fed with one block selection signal in the driving circuit and relays the selection signals between the logic circuit and the driving circuit, wherein the gate circuit includes a plurality of AND gate circuits in each driving block, and each of the AND gate circuits inputs one of the block selection signals of the second voltage amplitude level and one of the device selection signals of the second voltage amplitude level.