There are provided a head chip, a liquid jet head, a liquid jet recording device, and a method of manufacturing a head chip each capable of homogenously forming protective films on inner surfaces of channels while dealing with miniaturization of the channels and a decrease in pitch of the channels. The head chip according to an aspect of the present disclosure includes an actuator plate having a plurality of ejection channels arranged, a common electrode formed on an inner surface of the ejection channel, a first protective film disposed so as to cover the common electrode on the inner surface of the ejection channel, an intermediate plate which has ejecting communication holes and ejection-side introduction ports respectively communicated with the plurality of ejection channels, and which is disposed so as to face a channel opening surface on which the ejection channels open in the actuator plate, and a nozzle plate which has a plurality of nozzle holes configured to eject ink, and which is disposed at an opposite side to the actuator plate with respect to the intermediate plate in a state in which the ejecting communication holes are respectively communicated with the nozzle holes, and the ejection-side introduction ports are closed.

According to one embodiment, a liquid ejection head includes an actuator with a plurality of pressure chambers and dummy chambers. The pressure chambers are each part of a groove that is disposed between an adjacent pair of sidewalls. Each pressure chamber is in fluid communication with a nozzle for ejecting a liquid. The dummy chambers are each between an adjacent pair of pressure chambers. A common chamber is fluidly connected to an end of each of the pressure chambers. A throttle portion is at the end portion of each pressure chamber. Each throttle portion blocks a part of a liquid flow path from the first common chamber to the pressure chamber. The first throttle portion is formed of a resin material.

A liquid ejecting head of a side shooter type includes a plate including a plurality of nozzles arranged along a first direction and an actuator with a plurality of pressure chambers arranged along the first direction. Each pressure chamber communicates with a corresponding one of the nozzles. The actuator further includes dummy chambers, each of which is between two otherwise adjacent pressure chambers. Common chambers are provided in the actuator. The pressure and dummy chambers are arranged between the common chambers. The end portions of the pressure chambers are connected to a common chamber. The width of the end portions of each of the pressure chambers is less than the width of a portion of the pressure chamber between the end portions.

An Inkjet printer includes a substrate on a stage. A print head unit is positioned above the stage and discharges an ink on the substrate. The print head unit includes a manifold for guiding movement of the ink in a first direction therein. A head block is under the manifold and includes a plurality of channels connected to the manifold and piezoelectric elements adjacent to the channels to discharge the ink through the channels. A nozzle unit is under the head block and includes nozzles corresponding to the channels. A dispersion plate is between the manifold and the head block and disperses the ink in a second direction intersecting the first direction to supply the ink to the head block. Resistance plates are between the dispersion plate and the head block, are formed parallel substantially to the second direction, and prevent the ink from flowing in the first direction.

An inkjet head may include the following. A plurality of ink emitters, each including, an ink storage, a pressure changer which changes pressure in the ink stored in the ink storage, a nozzle which is connected to the ink storage and which emits ink according to a change in pressure in the ink in the ink storage, a plurality of precedent stage individual discharge flow paths which are connected to one ink storage and through which ink discharged without being supplied from the ink storage to the nozzle passes, and a subsequent stage individual discharge flow path to which, the plurality of precedent stage individual discharge flow paths join. A common discharge flow path may be connected to the plurality of subsequent stages individual discharge flow paths included in the plurality of ink emitters, and the ink which passes through the plurality of subsequent stage individual discharge flow paths flows.

A liquid discharge head includes a head body, a plurality of driver ICs, a flexible substrate, and a wiring board. The head body includes a discharge hole configured to discharge a liquid. The plurality of driver ICs controls drive of the head body. The plurality of driver ICs are mounted at the flexible substrate, and the flexible substrate is electrically connected to the head body. The wiring board includes a plurality of connectors. In addition, the flexible substrate includes: a plurality of protruding portions configured to protrude in the same direction and each including a tip portion to be inserted into corresponding one of the plurality of connectors; and a slit formed between the protruding portions adjacent to each other and extending up to a region between the driver ICs adjacent to each other.

In a liquid ejection head, an ejection pressure is applied to a pressure chamber for liquid ejection from a nozzle. A descender extends in a first direction and includes a first end connected to the pressure chamber and a second end. A communication passage is connected to the second end, extends in a second direction crossing the first direction, and has a first dimension in the first direction. The nozzle is positioned at the communication passage such that a shortest distance between an outer periphery thereof and a center of the second end is greater than 0.5 times a second dimension of the second end in the second direction. When viewed in the first direction, the center of the second end and a center of a cross-section defined by the nozzle to be orthogonal to an extending direction of the nozzle intersect an axis of the communication passage.

A liquid discharge head of the present disclosure includes a flow path member having a plurality of discharge holes, a plurality of pressure chambers, a plurality of first common flow paths, a plurality of second common flow paths, and a plurality of pressure sections. The first common flow paths and the second common flow paths are linked through a connection flow path outside a connection range C, the connection range C being linked through the pressure chambers. The flow path member is configured by laminating a plurality of flat plates. The connection flow path includes holes and/or grooves disposed in plates other than the common flow path plates that constitute the first common flow paths and the second common flow paths.

A liquid ejection head includes a nozzle for ejecting a droplet of a liquid, a pressure chamber connected to the nozzle, an actuator for changing a volume of the chamber according to a voltage signal, and a drive circuit generating the signal for ejecting n droplets, where n is an integer of 3 or more. The signal includes (n−1) ejection pulses, comprising a first pulse lowering the voltage signal to a first value to expand the chamber and then to a second value to contract the chamber, and a second pulse lowering the voltage signal to the first value and then to a third value higher than the second value. The pulses are input at intervals of 0.8λ to 1.2λ, where λ is a primary natural vibration period of the chamber filled with the liquid.

This ink-jet ink (hereinafter, referred to as “ink”) comprises an aqueous solvent, a pigment, and a thixotropic agent, and is characterized by having a viscosity at 25° C. of 15 mPa.Math.s or lower at a shear rate of 1,000 (1/s) and having a viscosity at 25° C. of 150 mPa.Math.s or higher at a shear rate of 1 (1/s) in a state in which the aqueous solvent has been removed therefrom so that the mass of the ink is 80% of the initial mass. This method for forming an image includes an ink delivery step in which droplets of an ink are ejected from an ink-jet head equipped with an ink circulation mechanism and are delivered to a base, and is characterized in that the ink comprises an aqueous solvent, a pigment, and a thixotropic agent, the ink is circulated so that the ink within the ink-jet head has a viscosity of 15 mPa.Math.s or lower, and the ink delivery step is conducted so that the droplets at the time of delivery to the base or immediately after the delivery have a loss in mass from the ink of 20% or less and have a viscosity of 150 mPa.Math.s or higher.