Liquid ejection head and image forming apparatus including the liquid ejection head

An image forming apparatus comprising a liquid ejection head,

• the liquid ejection head including:
• a common-chamber formation member including a common chamber to supply liquid to a plurality of pressure chambers communicating a plurality of nozzles for ejecting liquid droplets;
• a flexible thin-film member to form part of a wall face of the common chamber;
• and
• a thin-film support member bonded to the thin-film member with glue,
• wherein the thin-film support member has one of an opening and a recessed portion at least partially having a shape that is broad in an area proximal to a first surface of the thin-film support member bonded to the thin-film member and becomes narrower as an area of the one of the opening and the recessed portion is more distant from the first surface of the thin-film support member bonded to the thin-film member,
• the one of the opening and the recessed portion of the thin-film support member is sealed with the thin-film member, and
• a portion of the thin-film member corresponding to the one of the opening and the recessed portion of the thin-film support member has the glue on only a periphery area of the portion of the thin-film member that contacts the thin-film support member.

A method of making a liquid ejection head having a common-chamber formation member including a common chamber to supply liquid to a plurality of pressure chambers communicating a plurality of nozzles for ejecting liquid droplets, a flexible thin-film member to form part of a wall face of the common chamber, and a thin-film support member bonded to the thin-film member with glue, the method comprising:

• forming, in the thin-film support member, one of an opening and a recessed portion at least partially having a shape that is broad in an area proximal to a first surface of the thin-film support member bonded to the thin-film member and becomes narrower as an area of the one of the opening and the recessed portion is more distant from the first surface of the thin-film support member bonded to the thin-film member,
• applying the glue to an area other than the one of the opening and the recessed portion of the first surface of the thin-film support member bonded to the thin-film member;
• bonding the thin-film member bonded to a slightly-adhesive film to the first surface of the thin-film support member to seal the one of the opening and the recessed portion of the thin-film support member;
• and
• separating the slightly-adhesive film from the thin-film member in a state in which the glue is preliminarily or fully hardened.