Patent ID: 8833883
Filing Date: 2014-09-16
Classification: B41J

Abstract:
1. A liquid discharge head which discharges a liquid, comprising: a signal processing circuit which operates with a first voltage, and generates a discharge control signal for controlling discharge of a liquid; a liquid driving circuit including an electrothermal transducer, a driving element which drives the electrothermal transducer, and a control circuit which receives the discharge control signal from the signal processing circuit and outputs, to the driving element, a driving signal having a second voltage higher than the first voltage; and a monitoring circuit which monitors the first voltage and outputs a stop signal upon a drop of the first voltage, wherein the control circuit includes a circuit having a power receiving terminal which receives the second voltage, a first input terminal which receives a signal associated with the discharge control signal, a second input terminal which receives the stop signal, and an output terminal which outputs the driving signal when the stop signal is not activated, but does not output the driving signal when the stop signal is activated, wherein the monitoring circuit includes wherein the stop signal is output from the drain or a node at which a voltage changes depending on a voltage at the drain.