Liquid discharge head

A liquid discharge head comprising:

• a first unit configured to supply power;
• and
• a second unit including an input unit to which the power is input, a plurality of first heaters configured to discharge liquid and a second heater that does not contribute to discharge of liquid and is a heater for heating an element substrate on which the first heaters are formed, the first and second heaters being connected to the input unit via a common power source line, an energization unit configured to energize the plurality of first heaters and the second heater, and a selection unit configured to select the first heaters to be energized with a predetermined current by the energization unit,
• a block period comprising a discharge period during which the at least one target heater is energized, and a non-discharge period during which a plurality of non-target heaters are energized;
• the non-discharge period comprising a plurality of intervals;
• wherein the energization unit is further configured to energize the second heater for an interval occurring before and a different interval occurring after the first heater is energized, and
• wherein the energization unit is further configured to energize each of the first heaters selected by the selection unit with the predetermined current and the second heater with the predetermined current for a predetermined time respectively, the first heaters for discharging liquid are energized for a first period corresponding to a time interval at which liquid is discharged, and the second heater is energized for a second period corresponding to a time interval at which the element substrate is heated.