Patent ID: 8449094

Claim:
A liquid ejection head unit comprising: a flow-path forming substrate provided with pressure generating chambers communicating with nozzle openings, through which liquid is ejected, and a manifold communicating with the pressure generating chambers; pressure generating elements provided corresponding to the respective pressure generating chambers; a protection substrate accommodating the pressure generating elements and provided on the flow-path forming substrate; a damper portion facing the manifold with a compliance substrate therebetween; a buffer chamber communicating with the damper portion; an air open hole communicating with the damper portion and having an opening in the buffer chamber, at a position away from a bottom surface of the buffer chamber in the direction opposite to the gravity direction; an insertion hole extending from the flow-path forming substrate to the protection substrate; an opening provided in the buffer chamber so as to be oriented in a direction different from the direction in which the insertion hole is open; lead electrodes that extend from electrodes formed on the pressure generating elements and are exposed in the insertion hole; and a flexible wiring substrate connected at one end to the lead electrodes with an anisotropic conductive adhesive and extending through the insertion hole.