Liquid ejection head and method of manufacturing liquid ejection head

A method of manufacturing a liquid ejection head comprising multiple ejection orifices for ejecting liquid, and multiple pressure chambers that respectively communicate with the ejection orifices, and are arranged in a first direction and a second direction that intersect each other, the method comprising:

• forming multiple first grooves and multiple second grooves alternately in the first direction on a first piezoelectric substrate, the multiple first grooves constituting the multiple pressure chambers, the multiple second grooves extending in parallel with the multiple first grooves;
• forming multiple third grooves on a second piezoelectric substrate;
• stacking a plurality of the first piezoelectric substrates and a plurality of the second piezoelectric substrates alternately so that the multiple third grooves and the multiple first grooves are arranged alternately in the second direction;
• joining a plate-like member to the stacked body of the plurality of the first piezoelectric substrates and the plurality of the second piezoelectric substrates, the plate-like member being pierced by multiple flow paths that individually communicate with open ends of the multiple pressure chambers;
• and
• joining to the plate-like member an orifice plate in which multiple ejection orifices are arranged, the multiple ejection orifices communicating individually with the open ends of the multiple pressure chambers via the multiple flow paths,
• wherein a first pressure chamber of the multiple pressure chambers is shifted at its center in the first direction from a second pressure chamber of the multiple pressure chambers that is adjacent to the first pressure chamber in the second direction, and
• wherein, when a displacement amount of the center is represented by d, an opening width in the first direction of the first pressure chamber is represented by L4, and an opening width in the first direction of a first air chamber of the multiple air chambers that is provided between the first pressure chamber and the second pressure chamber in the second direction is represented by L2, the following expression is satisfied:
• L2>L4+d.