Liquid discharge head substrate, liquid discharge head, and liquid discharge apparatus

A liquid discharge head substrate comprising a substrate, a plurality of electrothermal converting elements arranged on a principal surface of the substrate along a first direction to discharge a liquid, a plurality of temperature detection elements arranged along the first direction to detect temperatures of the plurality of electrothermal converting elements, a plurality of liquid supply ports arranged along the first direction to supply the liquid, and a structure including at least one wiring layer in an insulating film arranged between the principal surface and the plurality of temperature detection elements,

• wherein a wiring pattern arranged in a first wiring layer, of the wiring layers, which is nearest to the plurality of temperature detection elements is provided with a plurality of opening portions arranged along the first direction so as to be adjacent to the plurality of temperature detection elements in an orthogonal projection with respect to the principal surface,
• the plurality of opening portions include a plurality of first opening portions and a plurality of second opening portions,
• each of the plurality of liquid supply ports passes through a corresponding one of the plurality of first opening portions, and
• the plurality of second opening portions are embedded with part of the insulating film and are arranged at least two ends of an array of the plurality of opening portions.