Head substrate, recording head, head cartridge and recording apparatus therewith

Abstract

An ink-jet recording head substrate which is mounted with electrothermal transducers producing thermal energy used for discharging ink and which drives the electrothermal transducers, comprising: a production circuit operating on a first voltage and producing a selection signal indicating driving or non-driving of the electrothermal transducer; a conversion circuit for converting the produced selection signal into a selection signal of a second voltage higher than the first voltage; and a driving circuit operating on the second voltage and driving the electrothermal transducer in accordance with the selection signal of the second voltage. The ink-jet recording head substrate includes a circuit which operates on the second voltage and which outputs the detection signal if the first voltage is less than a predetermined level, and sets a selection signal supplied to a circuit which operates on the second voltage and which performs the above driving if the detection signal is outputted, in a state indicating non-driving.

Dependencies are inferred from the claim text.