Liquid ejection head, liquid ejection head production method and liquid ejection head production system

A liquid ejection head production method for producing a liquid ejection head having a structure in which three or more head modules are arranged along a single direction, each of the three or more head modules including a plurality of ejection elements,

• the liquid ejection head production method comprising:
• a selection step of collectively selecting three or more head modules or sequentially selecting three or more head modules;
• an ejection volume distribution slope acquisition step of acquiring slope of ejection volume distribution in the single direction, for each of the three or more head modules selected in the selection step, the slope of the ejection volume distribution in the single direction being derived from an ejection volume at one end part in the single direction and an ejection volume at other end part in the single direction;
• a setting step of setting an arrangement in ascending order or descending order of the slope of the ejection volume distribution in the single direction for the three or more head modules acquired in the ejection volume distribution slope acquisition step;
• and
• an assembly step of arranging a first head module, a second head module and a third head module along the single direction, based on the arrangement order set in the setting step.

A liquid ejection head production system for producing a liquid ejection head having a structure in which three or more head modules are arranged along a single direction, each of the three or more head modules including a plurality of ejection elements, the liquid ejection head production system comprising:

• a selection unit that selects three or more head modules;
• an election volume distribution slope acquisition unit that acquires slope of ejection volume distribution in the single direction, for each of the three or more head modules selected by the selection unit, the slope of the ejection volume distribution in the single direction being derived from an ejection volume at one end part in the single direction and an ejection volume at other end part in the single direction;
• a head module setting unit that sets an arrangement in ascending order or descending order of the slope of the ejection volume distribution in the single direction for the three or more head modules acquired by the ejection volume distribution slope acquisition unit;
• and
• an assembly unit that arranges a first head module, a second head module and a third head module along the single direction, based on the arrangement order set by the head module setting unit.