An actuator component for a droplet deposition head that includes: a plurality of fluid chambers arranged side-by-side in an array, with certain of the fluid chambers being firing chambers, each of which is provided with at least one piezoelectric actuating element for causing droplet ejection from a nozzle for that firing chamber; and a plurality of non-actuable walls, each of which is formed of piezoelectric material and bounds at least one of the firing chambers.

A liquid discharge head includes a discharge unit including a nozzle, a pressurizing chamber, and a pressurizer and dummy units including a dummy pressurizing chamber and a dummy pressurizer. The liquid discharge head includes a discharge region where the discharge units is disposed in a row and a dummy region where one or more dummy units are disposed adjacent to the discharge region on an extended line of the row of the discharge units. The discharge region includes a central region located at the center of the row and an end portion region located adjacent to the dummy region at the end portion of the row.

An ink jet head includes first side walls including two piezoelectric elements, second side walls, a first electrode, a second electrode, an ink chamber containing conductive ink, and a control unit. The second side walls alternate with the first side walls to provide side surfaces for driving pressure chambers and dummy pressure chambers. On one of the first side walls, the first electrode is on the side wall surface of a driving pressure chamber and a second electrode is on the side wall surface of a dummy pressure chamber. The control unit applies a voltage having a first waveform to the first electrode, and a voltage having a second waveform, a portion of which is inverted with respect to the first waveform, to the second electrode to cause ink to be ejected, and cause the second electrode to electrically float such that ink is not ejected.

A droplet ejection device has a nozzle head with a plurality of ejection units, each of which includes a nozzle, a duct connected to the nozzle, and an electromechanical transducer arranged to create a pressure wave in a liquid in the duct so as to expel a droplet of the liquid from the nozzle. The device further includes an electronic control circuit arranged to apply control signals to the transducers and to receive detection signals that are generated in the transducers in response to the transducer being exposed to pressure fluctuations. The nozzle head includes a reference duct which has an electromechanical transducer serving as a reference transducer. The control circuit is arranged to subtract a detection signal of the reference transducer from a detection signal of at least one of the ejection units.

A flow path forming substrate has a pressure generation chamber communicating with a nozzle opening; and a communication plate having a supply path communicating with a manifold common to and communicating with the pressure generation chamber. A recess of the manifold opens opposite to the flow path forming substrate. The recess has a first recess, and a second recess deeper than the first recess. Supply paths are open on a bottom surface of the first recess, and are arranged in a first direction between the first and second recesses. An inclined surface inclined toward the bottom surface of the second recess from the bottom surface of the first recess is provided along the first direction. The inclined surface is configured as alternately repeated first and second inclined surfaces with different angles. A pitch of adjacent second inclined surfaces is smaller than a pitch of adjacent supply paths.

A liquid ejecting apparatus may include a flow path forming substrate in which a pressure generation chamber which communicates with a nozzle opening that discharges liquid is formed and a communication plate which has a supply path that communicates with a manifold. A recess portion which configures at least a part of the manifold is open on a side opposite to the flow path forming substrate, on the communication plate. The supply path includes a discharge supply path which communicates with a discharge pressure generation chamber that discharges liquid from the nozzle opening, and a dummy supply path which communicates with a dummy pressure generation chamber that does not discharge liquid from the nozzle opening.

A liquid ejection head includes nozzles through which liquid is ejected, pressure chambers communicating with the nozzles, volumes of the chambers being varied to eject the liquid, a substrate including an electrode on a surface of the substrate, an actuator connected to the electrode and configured to vary the volumes, the actuator having a first side surface connected to the surface of the substrate, a first cover member that covers the first side surface and includes openings each facing one of the chambers, the openings having larger fluid resistance than the chambers, an insulating material between the surface of the substrate and the first cover member, and an insulating film that covers the electrode on the substrate.

A liquid ejecting head includes a plurality of nozzles that eject a liquid, a plurality of pressure chambers to which a pressure for ejecting the liquid from each of the plurality of nozzles is applied and that are arranged in a first direction, a first liquid chamber disposed in the first direction with respect to a first pressure chamber located at an end of the plurality of pressure chambers in the first direction, a first vibration plate that defines a portion of the first liquid chamber, a manifold commonly coupled to the plurality of pressure chambers and the first liquid chamber, and a strain gauge for acquiring a pressure within the first liquid chamber, the strain gauge corresponding to the first vibration plate.

A liquid discharge head includes a discharge unit including a nozzle, a pressurizing chamber, and a pressurizer and dummy units including a dummy pressurizing chamber and a dummy pressurizer. The liquid discharge head includes a discharge region where the discharge units is disposed in a row and a dummy region where one or more dummy units are disposed adjacent to the discharge region on an extended line of the row of the discharge units. The discharge region includes a central region located at the center of the row and an end portion region located adjacent to the dummy region at the end portion of the row.