Disclosed is an inkjet recording apparatus including: a head that includes a plurality of nozzles configured to eject ink onto a recording medium; a drive waveform generator that generates drive waveforms to drive the respective plurality of nozzles; a reverberation waveform receiver that acquires reverberation waveforms generated in the respective plurality of nozzles to be measured in accordance with the drive waveforms; and a hardware processor that generates a characteristic distribution of the acquired reverberation waveforms and performs, based on the characteristic distribution, an ejection characteristic control process of controlling an ejection characteristic of the plurality of nozzles to be uniform.

A head module includes a liquid discharge head, a liquid storage, and a heater. The liquid discharge head discharges a liquid in a first direction. The liquid storage stores the liquid. The liquid storage includes a first wall, a second wall opposite the first wall in a second direction intersecting the first direction, an inlet on one end of the liquid storage, an outlet on another end of the liquid storage, and multiple partitions. The inlet introduces the liquid to the liquid storage. The outlet feeds the liquid to the liquid discharge head. The multiple partitions extend from the first wall toward the second wall with gaps between tips of the multiple partitions and the second wall in the second direction, respectively. The multiple partitions are arranged at intervals in the first direction. The heater is disposed on the first wall to heat the liquid in the liquid storage.

A recording element substrate includes a plurality of discharging ports; a plurality of nozzles connected to the plurality of discharging ports, respectively; a passage forming portion in which a plurality of individual passages connected to the plurality of nozzles, respectively, and a common passage connected to the plurality of individual passages are formed; a plurality of supply ports disposed at positions corresponding to a plurality of nozzle groups on the common passage, respectively, along an array direction of the plurality of discharging ports; and a plurality of supply passages which extend from the plurality of supply ports to a rear surface of the recording element substrate in a direction intersecting with the rear surface. A plurality of heaters configured to heat liquid flowing through the common passage are provided for each of the plurality of supply ports along at least a part of a peripheral edge of the supply port.

A head module includes at least two liquid discharge heads, a reservoir, a heater, an inlet, a first outlet, a second outlet, and a wall member. The liquid discharge heads discharge liquid. The reservoir stores the liquid. The heater heats the liquid in the reservoir. The liquid is to be introduced from the inlet into the reservoir. The liquid in the reservoir is to be delivered from the first outlet to one of the liquid discharge heads. The liquid in the reservoir is to be delivered from the second outlet to another of the liquid discharge heads. A distance between the inlet and the first outlet is shorter than a distance between the inlet and the second outlet. The wall member is interposed between the inlet and the first outlet.

A head module includes a liquid discharge head, a liquid storage, and a heater. The liquid discharge head discharges a liquid in a first direction. The liquid storage stores the liquid. The liquid storage includes a first wall, a second wall opposite the first wall in a second direction intersecting the first direction, an inlet on one end of the liquid storage, an outlet on another end of the liquid storage, and multiple partitions. The inlet introduces the liquid to the liquid storage. The outlet feeds the liquid to the liquid discharge head. The multiple partitions extend from the first wall toward the second wall with gaps between tips of the multiple partitions and the second wall in the second direction, respectively. The multiple partitions are arranged at intervals in the first direction. The heater is disposed on the first wall to heat the liquid in the liquid storage.