Patent attributes
A head for a liquid discharging apparatus includes a cavity unit having a cavity plate in which pressure chambers are formed and a vibration plate and a base plate which are joined to upper and lower surfaces of the pressure chambers respectively. In a joining surface of the cavity plate and the vibration plate and in a joining surface of the cavity plate and the base plate, test grooves are formed corresponding to column portions which partition mutually adjacent pressure chambers among the plurality of pressure chambers, and communication grooves capable of supplying air communicate with the respective test grooves. By supplying air to the respective test grooves through the communication grooves and detecting a change in supply pressure thereof, it is possible to test a joint state of the cavity plate with the vibration plate and with the base plate at the column portions.
