Method for manufacturing liquid discharge head, liquid discharge head, and method for manufacturing liquid discharge head substrate

A liquid discharge head comprising:

• a liquid discharge head substrate having a base, a pressure generation portion provided at a side of a front surface of the base to generate pressure for discharging a liquid, a cover layer provided at the side of the front surface of the base, and a supply port passing through the base and the cover layer to supply the liquid to the pressure generation portion;
• a flow path forming member provided at the side of the front surface of the base to form a flow path for feeding the liquid supplied from the supply port to the pressure generation portion, the flow path forming member having a liquid discharge port surface opposite a surface facing the liquid discharge head substrate;
• and
• a resin layer provided on a front surface of the cover layer facing the flow path forming member and provided over an opening edge portion of the supply port provided on the front surface of the cover layer,
• wherein the resin layer includes a part contacting the front surface of the cover layer, and a step portion located at inside of the supply port as viewed from a direction orthogonal to the front surface of the base and the step portion includes a step coming closer to the liquid discharge port surface than the part contacting the front surface of the cover layer the liquid discharge head substrate includes the pressure generation portions adjacent to each other,
• the liquid discharge head substrate includes the pressure generation portions adjacent to each other,
• the liquid discharge head comprises an intermediate layer formed between the liquid discharge head substrate and the flow path forming member, the pressure chambers each including the pressure generation portion, the flow paths communicating with the respective pressure chambers, and a common liquid chamber allowing the flow paths and the supply port to communicate with each other,
• the intermediate layer is not provided in an area of a surface of the liquid discharge head substrate facing the flow path forming member across the pressure chambers, the flow paths, and a part of the common liquid chamber, and
• the intermediate layer is connected to the resin layer through the common liquid chamber from between a partition of the flow path forming member to separate the pressure chambers adjacent to each other and the flow paths adjacent to each other and the liquid discharge head substrate.