Liquid discharge head and image forming apparatus

A liquid discharge head, comprising:

• a nozzle plate configured to have a plurality of nozzles arrayed to discharge liquid droplets;
• a passage plate configured to form individual liquid chambers communicating with the respective nozzles;
• and
• a wall surface member configured to form a wall surface of the individual liquid chambers,
• wherein the passage plate is formed with at least three plate-shaped members stacked and bonded by an adhesive,
• wherein the nozzle plate and one of the plate-shaped members of the passage plate are bonded by the adhesive, and another of the plate-shaped members of the passage plate, and the wall surface member are bonded by the adhesive,
• wherein the three plate-shaped members include separation wall parts foil ling separation walls between the individual liquid chambers,
• wherein at least one of the three plate-shaped members has a separation wall width as a width in a nozzle arrangement direction of the separation wall part, different from a separation wall width of the other plate-shaped members,
• wherein fillets of the adhesive are formed between the wall surface of the separation wall part of the plate-shaped member whose separation wall width is relatively narrow, and a bonded surface of the plate-shaped member whose separation wall width is relatively wide, between the nozzle plate and the wall surface of the separation wall part of the plate-shaped member, and between the wall surface member and the wall surface of the separation wall part of the plate-shaped member, in a direction along the nozzle arrangement direction, and
• wherein a side surface of the separation wall part whose width is relatively narrow faces an adjacent individual liquid chamber and said separation wall part whose width is relatively narrow is stacked on the bonded surface of the adjacent plate-shaped member whose separation wall width is relatively wide, and corresponding fillets of adhesive bond (i) said side surface of the separation wall part whose width is relatively narrow and (ii) the bonded surface of the adjacent plate-shaped member whose separation wall width is relatively wide.