Abstract: Various embodiments provide an ejection device for a fluid. The ejection device includes a first semiconductor wafer, housing, on a first side thereof, a piezoelectric actuator and an outlet channel for the fluid alongside the piezoelectric actuator; a second semiconductor wafer having, on a first side thereof, a recess and, on a second side thereof opposite to the first side, at least one inlet channel for said fluid fluidically coupled to the recess; and a dry-film coupled to a second side, opposite to the first side, of the first wafer. The first and the second wafers are coupled together so that the piezoelectric actuator and the outlet channel are set directly facing, and completely contained in, the recess that forms a reservoir for the fluid. The dry-film has an ejection nozzle.

Abstract: There is provided liquid discharging head including individual channels, supply throttles, and return throttles formed in plates. The supply throttles are formed in first plate of the plates and the return throttles are formed in second plate of the plates. Each of the supply throttles has cross section which is rectangle having first and second sides. Each of the return throttles has cross section which is rectangle having first and second sides. The length of the first side of each of the supply throttles and the length of the first side of each of the return throttles are substantially identical. The length of the second side of each of the supply throttles and the length of the second side of each of the return throttles are substantially identical. Aspect ratio of each of the supply throttles and aspect ratio of each of the return throttles are substantially identical.

Abstract: A liquid ejecting head includes a pressure chamber, a vibration plate including a first vibration plate, a second vibration plate, and a third vibration plate, and a piezoelectric actuator, being stacked in this order. A portion where the piezoelectric layer and the third vibration plate are stacked in a first direction on the first vibration plate and the second vibration plate, and a portion where the piezoelectric layer and the third vibration plate are not stacked are provided. One of the first vibration plate and the second vibration plate has a compressive stress and another one of the first vibration plate and the second vibration plate has a tensile stress. A Young's modulus of the third vibration plate is larger than Young's moduli of the first vibration plate and the second vibration plate.

Abstract: The control portion controls (i) a discharging operation of discharging the liquid from the plurality of nozzles by driving the plurality of energy generation elements and (ii) a pressurization operation of pressurizing the liquid from the individual flow path side in a state in which the plurality of nozzles are sealed by the sealing portion.

Abstract: A piezoelectric actuator includes, in a first direction in which pressure chambers are arranged side by side, an active portion in which a piezoelectric layer is sandwiched between a first electrode and a second electrode in a first area of a vibration plate corresponding to opposite ends of each pressure chamber and does not include the active portion in a second area of the vibration plate corresponding to a center of the pressure chamber. The vibration plate has, in the first direction, a thick-walled portion with a predetermined thickness in the first area and a thin-walled portion thinner than the thick-walled portion in the second area.

Abstract: A liquid ejecting head includes a flow passage, an energy producing element, and a nozzle. A direction in which a portion which is a part of the flow passage and with which the nozzle is in communication extends is defined as a first direction. A direction in which the liquid is ejected from the nozzle and which is orthogonal to the first direction is defined as a second direction. A direction which is orthogonal to both the first direction and the second direction is defined as a third direction. Given this definition, the nozzle includes a first portion and a second portion, the second portion being located closer to the flow passage along the second direction than the first portion is. The cross-sectional area size of the first portion when viewed in the second direction is smaller than the cross-sectional area size of the second portion when viewed in the second direction.

Abstract: An inkjet printing apparatus comprises an inkjet head disposed above a stage and including nozzles through which ink including bipolar elements is discharged, the bipolar elements each having regions partially doped with different polarities. At least part of the nozzles is deflected from a direction in case that the nozzles are in a deflected state.

Abstract: when one of two positions in a second direction intersecting the first direction is defined as a first position and the other position is defined as a second position from which the shortest distance to the partition wall is shorter than the shortest distance from the first position to the partition wall, the vibrating plate has a first portion corresponding to the first position and a second portion corresponding to the second position, and a surface of the first portion in the first direction is, in the first direction, closer than a surface of the second portion in the first direction.

Abstract: A liquid ejection head has a base plate with an actuator on an upper surface. Pressure chambers are formed in the actuator. A first common chamber connects to a first side of the pressure chambers, and a second common chamber connects to a second side. A nozzle plate is on an upper surface side of the actuator and has nozzles at positions corresponding to the pressure chambers. A supply hole is in the base plate and connected to the first common chamber. A discharge hole is in the base plate and connected to the second common chamber. A manifold is on a lower surface of the base plate. The manifold has a supply flow path for supplying liquid to the supply hole, a discharge flow path for receiving liquid from the discharge hole, and a temperature control flow path through which a temperature control liquid can flow.

Abstract: A liquid ejecting apparatus includes a liquid ejecting head including head chips each including a nozzle plate, a holder that is formed of resin, holds the head chips, and includes a flow path for supplying the liquid to each of the head chips, a holder cover that is formed of a material having a higher thermal conductivity than a thermal conductivity of the holder and houses the head chips and the holder, and a fixing plate that is formed of metal and to which the holder cover and the head chips are fixed, a carriage on which the liquid ejecting head is mounted, and a heater that is mounted on the carriage and heats the liquid inside each of the head chips via the holder cover and the fixing plate.

Abstract: A liquid ejection head includes: a piezoelectric body; an vibration plate to be vibrated by a drive of the piezoelectric body; and a pressure chamber substrate including a pressure chamber which applies a pressure to a liquid by an vibration of the vibration plate; the pressure chamber substrate, the vibration plate, and the piezoelectric body are laminated in this order; and the vibration plate includes: a first layer containing silicon as a constituent element, a second layer which is disposed between the first layer and the piezoelectric body and which contains as a constituent element, a metal element selected from chromium, titanium, and aluminum, and a third layer which is disposed between the second layer and the piezoelectric body and which contains zirconium as a constituent element.

Abstract: There is provided a liquid discharge head comprising a channel-forming body. The channel-forming body includes a nozzle surface in which a plurality of nozzles arranged in a line open. The channel-forming body has formed therein a supply manifold, a return manifold, and a plurality of individual channels. Each individual channel includes a pressure chamber, a descender, a return throttling path, and an interposing channel that interposes between the return throttling path and the descender and communicates with the nozzle. The return throttling path extends in a second direction differing from a first direction in which the interposing channel extends. A cross-sectional area of the return throttling path is smaller than a cross-sectional area of the interposing channel.

Abstract: A liquid ejecting apparatus has: a liquid discharge section configured to change an inner volume of a first pressure chamber communicating with a nozzle by a first piezoelectric element; a pressure vibration section configured to change an inner volume of a second pressure chamber by a second piezoelectric element; a driving signal generation section configured to generate a discharging driving signal for the first piezoelectric element and a detection driving signal for the second piezoelectric element; and a vibration detection section that detects residual vibration of a liquid filled in the second pressure chamber after the supply of the detection driving signal. The viscous resistance of a flow path between the second pressure chamber and the common flow path is lower than the viscous resistance of a flow path between the first pressure chamber and the common flow path.

Abstract: A wafer structure is disclosed and includes a chip substrate and an inkjet chip. The chip substrate is a silicon substrate fabricated by a semiconductor process on a wafer of 12 inches. The inkjet chips are formed on the chip substrate by the semiconductor process and diced into the inkjet chip. The inkjet chip includes plural ink-drop generators generated by the semiconductor process on the chip substrate. Each of the plurality of ink-drop generators includes a nozzle. A diameter of the nozzle is in a range between 0.5 micrometers and 10 micrometers. A volume of an inkjet drop discharged from the nozzle is in a range between 1 femtoliter and 3 picoliters. The ink-drop generators form plural longitudinal axis array groups having a pitch and plural horizontal axis array groups having a central stepped pitch equal to or less than 1/600 inches.

Abstract: Disclosed is an inkjet head and a method of ejecting an ink using the same. An inkjet head according to one embodiment of the present invention may include nozzles each including a ejecting hole through which a solution including a light-emitting element is ejected and pairs of electrodes which are provided around the ejecting holes to face each other and which apply an electrode voltage to the light-emitting element.

Abstract: When a first liquid containing the particles whose particle size average value is a first particle size is supplied to the liquid discharge head, the control device controls the circulation mechanism so that a circulation flow rate of the first liquid in the supply flow path, the nozzle flow path, and the discharge flow path is a first flow rate. When a second liquid containing the particles whose particle size average value is a second particle size larger than the first particle size is supplied to the liquid discharge head, the control device controls the circulation mechanism so that the circulation flow rate of the second liquid is a second flow rate lower than the first flow rate.

Abstract: 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.

Abstract: Provided is an inkjet head containing a nozzle plate having at least a substrate, wherein the nozzle plate has a liquid-repellent layer on an outermost surface of the substrate on an ink ejection surface side; a liquid-repellent layer base film is provided between the substrate and the liquid-repellent layer; and the liquid-repellent layer base film contains at least silicon (Si) and carbon (C), and having a maximum peak P of a binding energy of a Si2p orbital of a surface portion measured by X-ray photoelectron spectroscopy is in the range represented by the following Formula (1), Formula (1): 99.6 (eV)?P?101.9 (eV).

Abstract: A liquid ejecting head includes piezoelectric elements for ejecting liquid from nozzles, pressure chambers in communication with the nozzles, individual supply flow passages for supplying the liquid to the nozzles, individual collection flow passages for collecting the liquid not ejected from the nozzles, a diaphragm that defines a wall surface of the pressure chambers and deforms by driving the piezoelectric element, a flexible substrate having a drive circuit electrically coupled to the piezoelectric elements, and a heat release member that is either in contact with an surface of the flexible substrate that faces away from the drive circuit, or in contact with the drive circuit, and conducts heat of the drive circuit to the diaphragm. The heat release member is disposed closer to the individual supply flow passage than to the individual collection flow passage.

Abstract: There is provided a liquid discharge head including: a plurality of nozzles arranged in a first direction; a plurality of pressure chambers; a plurality of throttles; and a common channel extending in the first direction and connected to the plurality of throttles. The common channel has: a supply port, and a terminal part which is at least one of both end parts in the first direction of the common channel, the supply port being not provided at the terminal part. A terminal throttle which is one of the plurality of throttles and which is positioned closest to the terminal part among the plurality of throttles has a channel resistance same as a channel resistance of a throttle of the plurality of throttles different from the terminal throttle, and extends from a connection between the terminal throttle and one of the plurality of pressure chambers to the terminal part.