Patent ID: 8794733

Claim:
A recording head comprising: a plurality of electro-thermal transducers, each of which generates heat in accordance with an electric current; a plurality of temperature sensors, each of which disposed in correspondence to each one of the plurality of electro-thermal transducers, configured to detect temperature of the plurality of electro-thermal transducers; a constant current source configured to connect to one side of each of the plurality of temperature sensors and to supply a constant current to the each of the plurality of temperature sensors; a plurality of first switching elements, each of which is connected between the other side of each of the plurality of temperature sensors and a ground line, configured to switch to apply or not an electric current to the each of the plurality of temperature sensors; a plurality of second switching elements, each of which is connected between the one side of each of the plurality of temperature sensors and an amplifier circuit, configured to switch to supply or not a first voltage at the one side of each of the plurality of temperature sensors to the amplifier circuit; a plurality of third switching elements, each of which is connected between the other side of each of the plurality of temperature sensors and the amplifier circuit, configured to switch to supply or not a second voltage at the other side of each of the plurality of temperature sensors to the amplifier circuit; and a control circuit configured to control switching of the first, second and third switching elements.