An inkjet print head includes a droplet ejection unit having a pressure chamber; a first actuator configured for changing a volume of the pressure chamber; a second actuator configured for changing the volume of the pressure chamber; and a nozzle orifice. The inkjet print head further includes a control circuitry operatively connected to the first actuator and the second actuator. The control circuitry includes a drive circuitry for supplying a drive signal to at least one of the first and the second actuator; a sensing circuitry for receiving a sense signal from the first actuator; and a switch circuitry for switching a connection of the first actuator between a connection to the drive circuitry and a connection to the sensing circuitry.

The head has a passage member having a nozzle and a pressurizing chamber which is communicated with the nozzle and is positioned on the side opposite to the side where the nozzle is opened, a piezoelectric actuator substrate which is superimposed on the passage member so as to cover the pressurizing chamber, and a flexible printed circuit which faces the piezoelectric actuator substrate from the opposite side to the passage member. The piezoelectric actuator substrate has a piezoelectric body which is exposed on the flexible printed circuit side. The piezoelectric body has a via hole opened toward the flexible printed circuit and has a projection portion at the edge part of the via hole which projects to the flexible printed circuit side.

According to one embodiment, an inkjet head includes a plurality of actuators on a substrate in a row and spaced from each other, each actuator extending from the substrate to form a chamber space between each adjacent pair of actuators in the plurality of actuators, a flow passage block including a frame portion surrounding an outer periphery of the plurality of actuators and a blocking portion having protrusions sealing both ends of the chamber spaces between every other adjacent pair of actuators along the row, and a common ink chamber above the flow passage block and in fluid communication with the chamber spaces between any adjacent pairs of actuators not sealed at both ends by the blocking portion with a plurality of chamber spaces.

An ink-jet recording apparatus includes: a conveyor conveying a sheet; a recording head including first nozzles, second nozzles, first driving elements corresponding to the first nozzles respectively, and second driving elements corresponding to the second nozzles respectively; a controller; and a head driving circuit connected to the controller by first and second signal lines and a third signal line through which a clock signal is transmitted, and connected electrically to the first driving elements and the second driving elements. Each of the first and second driving elements is driven to jet an ink droplet from one of the first and second nozzles when driving voltage is applied from the head driving circuit. The controller repeatedly executes conveyance processing for conveying the sheet with the conveyor and recording processing in which pattern signals indicating patterns of the driving voltage are outputted serially and a jetting instruction signal is outputted serially.

An apparatus includes a reservoir and a printhead. The printhead includes a support structure including a deformable portion defining at least a top surface of a pumping chamber, a flow path extending from the reservoir to the pumping chamber to transfer fluid from the reservoir to the pumping chamber, and an actuator disposed on the deformable portion of the support structure. A trench is defined in a top surface of the actuator. Application of a voltage to the actuator causes the actuator to deform along the trench, thereby causing deformation of the deformable portion of the support structure to eject a drop of fluid from the pumping chamber.

A liquid jetting device includes a plurality of nozzles from which a liquid can be ejected, a plurality of pressure chambers, each being in fluid communication with an associated nozzle in the plurality of nozzles, actuators associated with each pressure chamber and configured to cause a pressure change in an associated pressure chamber in the plurality of pressure chambers, a heat-conductive chassis to which the plurality of nozzles, the plurality of pressure chambers, and the actuators are mounted, an integrated circuit held inside the chassis and configured to drive the actuators to eject liquid from the plurality of nozzles, a circuit board electrically connected to the integrated circuit and configured supply an electrical signal to integrated circuit, and a heat-conductive support to which the circuit board is mounted, the heat-conductive support held by the heat-conductive chassis to contact the integrated circuit and an inner surface of the heat-conductive chassis.

A liquid ejecting apparatus includes a recording head including a plurality of nozzles from which liquid is ejected, a plurality of pressure chambers which communicate with each nozzle, respectively, a piezoelectric element which causes liquid to be ejected from the nozzle by causing a pressure fluctuation in the liquid in the pressure chamber, and a printer controller which is connected to the piezoelectric element through an individual signal line, and supplies a driving signal which drives the piezoelectric element through the individual signal line. The individual signal line is provided as many as n times (here, n is natural number of 2 or more) or more of the number of pressure chambers.

An ink-jet recording apparatus includes: a conveyor conveying a sheet; a recording head including first nozzles, second nozzles, first driving elements corresponding to the first nozzles respectively, and second driving elements corresponding to the second nozzles respectively; a controller; and a head driving circuit connected to the controller by first and second signal lines and a third signal line through which a clock signal is transmitted, and connected electrically to the first driving elements and the second driving elements. Each of the first and second driving elements is driven to jet an ink droplet from one of the first and second nozzles when driving voltage is applied from the head driving circuit. The controller repeatedly executes conveyance processing for conveying the sheet with the conveyor and recording processing in which pattern signals indicating patterns of the driving voltage are outputted serially and a jetting instruction signal is outputted serially.

According to one embodiment, an inkjet head includes a plurality of actuators on a substrate in a row and spaced from each other, each actuator extending from the substrate to form a chamber space between each adjacent pair of actuators in the plurality of actuators, a flow passage block including a frame portion surrounding an outer periphery of the plurality of actuators and a blocking portion having protrusions sealing both ends of the chamber spaces between every other adjacent pair of actuators along the row, and a common ink chamber above the flow passage block and in fluid communication with the chamber spaces between any adjacent pairs of actuators not sealed at both ends by the blocking portion with a plurality of chamber spaces.

An example provides a fluid ejection apparatus including a first firing resistor and a second firing resistor to selectively cause fluid to be ejected through a single nozzle, and a parasitic resistor arranged to add a parasitic resistance to the first firing resistor.