Liquid ejection head substrate and liquid ejection head

A liquid ejection head substrate comprising:

• a plurality of energy generating element arrays each including a plurality of energy generating elements configured to generate energy for ejecting liquid;
• a supply port array in which a plurality of supply ports configured to supply liquid to the plurality of energy generating elements are arranged between the plurality of energy generating element arrays in an arrangement direction in which the plurality of energy generating elements are arranged;
• at least one temperature detection element group including a plurality of temperature detection elements configured to detect a temperature of the liquid ejection head substrate, that are arranged on one side of the supply port array, and
• at least one heating element group including a plurality of heating elements configured to heat the liquid ejection head substrate, that are arranged on another side of the supply port array,
• wherein the number of the at least one temperature detection element group is smaller than the number of the energy generating element arrays and the number of the at least one heating element group is smaller than the number of the energy generating element arrays.

A liquid ejection head substrate comprising:

• a plurality of energy generating element arrays each including a plurality of energy generating elements configured to generate energy for ejecting liquid;
• a supply port array in which a plurality of supply ports configured to supply liquid to the plurality of energy generating elements are arranged between the plurality of energy generating element arrays in an arrangement direction in which the plurality of energy generating elements are arranged;
• a temperature detection element group including a plurality of temperature detection elements for detecting a temperature of the liquid ejection head substrate, that are arranged on one side of the supply port array, and
• a plurality of heating element groups including a plurality of heating elements for heating the liquid ejection head substrate, that are arranged on another side of the supply port array,
• wherein the heating element groups are provided on two sides of the temperature detection element group.

A liquid ejection head comprising:

• a liquid ejection head substrate including:
• a plurality of energy generating element arrays each including a plurality of energy generating elements configured to generate energy for ejecting liquid;
• a supply port array in which a plurality of supply ports configured to supply liquid to the plurality of energy generating elements are arranged between the plurality of energy generating element arrays in an arrangement direction in which the plurality of energy generating elements are arranged;
• a temperature detection element that is configured to detect a temperature of the liquid ejection head substrate and that is provided on one side of the supply port array;
• a heating element that is configured to heat the liquid ejection head substrate and that is provided on another side of the supply port array, and
• an ejection port forming member in which an ejection port array including a plurality of ejection ports configured to eject liquid is provided so as to correspond to the energy generating element array,
• wherein the liquid ejection head substrate is provided in a plurality in the arrangement direction,
• wherein the liquid ejection head substrates neighboring each other each include an overlapping region where the energy generating elements provided on the respective liquid ejection head substrates overlap and a non-overlapping region where the energy generating elements provided on the respective liquid ejection head substrates do not overlap when viewed in a direction perpendicular to the arrangement direction, and
• wherein the temperature detection element and the heating element are provided on each of the overlapping regions and each of the non-overlapping regions.