Abstract: An inkjet printing apparatus is provided with a tank that stores ink, a print head that performs print operation by ejecting ink supplied from the tank, a circulation unit that establishes a circulating state to circulate ink in a circulation path if print operation is performed and establishes a stopped state to stop circulation of ink if print operation is terminated, and a deaeration unit that performs deaeration operation to deaerate ink inside the circulation path. The apparatus includes an estimation unit that estimates a dissolved gas amount in ink inside the circulation path based on dissolved gas amounts increased in the circulating state and in the stopped state, respectively, and a control unit that causes the deaeration unit to execute deaeration operation after completion of print operation if the dissolved gas amount estimated by the estimation unit exceeds a predetermined threshold.

Abstract: The individual flow path includes a nozzle communicating with an outside, a first flow path, in the middle of which the nozzle is disposed and which extends in a first direction that is an in-plane direction of a nozzle surface of the nozzle plate in which the nozzle opens, a second flow path coupled to the first flow path and extending in a second direction other than the first direction, a third flow path coupled to the second flow path and extending in the third direction other than the second direction, and a pressure chamber which is disposed in the third flow path and in which a pressure change is induced by the energy generating element. A cross-sectional area of the first flow path is smaller than a cross-sectional area of the second flow path.

Abstract: A liquid discharge head is configured to discharge a liquid, and the liquid discharge head includes an actuator substrate and a holding substrate bonded to the actuator substrate. The actuator substrate includes a pressure generator, and a wiring electrode configured to electrically connect the pressure generator and an exterior of the liquid discharge head. The holding substrate includes an opening configured to expose the wiring electrode to the exterior of the liquid discharge head, and a detection surface adjacent to the opening, the detection surface having a higher reflectance than a surface of the wiring electrode of the actuator substrate.

Abstract: A liquid discharging head includes: individual channels aligned in a first direction; and a first common channel and a second common channel extending in the first direction. Each of the individual channels includes a nozzle, a first pressure chamber and second pressure chamber arranged side by side in the first direction, and a connecting channel connecting the nozzle, the first pressure chamber and the second pressure chamber to one another. A first actuator and a second actuator are provided on the first pressure chamber and the second pressure chamber, respectively. The first common channel communicates with the first and second pressure chambers; and the second common channel communicates with the connecting channel.

Abstract: A liquid ejecting head including: an individual flow path row in which a plurality of individual flow paths communicating with a nozzle that ejects a liquid in a first axis direction are arranged in parallel along a second axis orthogonal to a first axis, and a first common liquid chamber communicating with the plurality of individual flow paths, in which each of the plurality of individual flow paths has a pressure chamber that stores a liquid.

Abstract: There is provided a liquid discharge head, including: a pressure chamber connected to a nozzle from which a liquid is discharged; an actuator configured to apply discharge pressure to the liquid in the pressure chamber; a first supply channel which is connected to the pressure chamber, and through which a first liquid is supplied to the pressure chamber; a second supply channel, different from the first channel, which is connected to the pressure chamber, and through which a second liquid different from the first liquid is supplied to the pressure chamber; a first valve which is disposed in the first supply channel, and by which the first supply channel is opened and closed; and a second valve which is disposed in the second supply channel, and by which the second supply channel is opened and closed.

Abstract: Isolation between electrodes is ensured to enhance resistance to a liquid. A conductive film is provided to a surface of a piezoelectric substrate, and laser processing is performed in a groove extending direction on the conductive film between a first groove and a second groove provided to the piezoelectric substrate to thereby form a laser processing area where the conductive film is removed to the surface of the piezoelectric substrate between the first groove and the second groove. In forming the laser processing area, an irradiation operation with a laser is performed along a plurality of laser processing lines extending in the groove extending direction.

Abstract: A liquid ejecting apparatus includes a head unit having heads that configure to eject a liquid in a first-direction, and in which a second-direction orthogonal to the first-direction is a short direction and a third-direction orthogonal to the first and second-directions is a longitudinal direction, and a holding member. The head unit has a first-head, a second-head adjacent to the first-head, and disposed in the second-direction, and a third head adjacent to the second-head, and disposed in the second-direction. The first head has a first-gripping portion provided on an upper surface. The second-head has a second-gripping portion provided on the upper surface. The third-head has a third-gripping portion provided on the upper surface. A position of the second-gripping portion with respect to the third-direction is different from positions of the first-gripping portion and the third-gripping portion with respect to the third-direction.

Abstract: A liquid discharge head includes a common flow channel extending along a first direction, and individual flow channels arranged along the first direction. Each individual flow channel includes a first pressure chamber and a second pressure chamber arranged along the first direction, each of which communicates with the common flow channel, a nozzle located away from the first and second pressure chambers in a second direction orthogonal to the first direction, and a connection flow channel connecting the first pressure chamber, the second pressure chamber, and the nozzle with each other. One end of the connection flow channel in the second direction communicates with the first pressure chamber and the second pressure chamber, and the other end thereof in the second direction communicates with the nozzle. The connection flow channel extends along the second direction from the one end to the other end thereof in the second direction.

Abstract: A liquid ejecting head configured to eject a liquid in a first direction includes an upper surface facing a direction opposite to the first direction, and a gripping portion provided on the upper surface to grip the liquid ejecting head.

Abstract: A substrate with an electrical connection section or a substrate for liquid ejection head comprises a wiring layer, a diffusion prevention layer laid on the wiring layer and a connection member laid on the diffusion prevention layer for establishing an electrical connection to an outside. An insulation layer having a wiring-layer-exposing opening is arranged on the wiring layer and the diffusion prevention layer is arranged in the opening, while the connection member is arranged on the diffusion prevention layer so as to cover an outer peripheral edge of the diffusion prevention layer.

Abstract: A method of manufacturing a liquid discharge head includes preparing a first substrate where a discharge port configured to discharge liquid is formed to face a first surface, a concave portion is formed on a side of a second surface opposite to the first surface, and a first liquid flow passage penetrating from the first surface to the second surface is opened inside the concave portion on the side of the second surface, preparing a second substrate including a second liquid flow passage opened on a third surface, and sticking the first substrate and the second substrate to communicate the first liquid flow passage with the second liquid flow passage by bonding a bottom face of the concave portion and the third surface with an adhesive agent.

Abstract: A lead-free piezoelectric material includes perovskite-type metal oxide containing Na, Nb, Ba, Ti, and Mg and indicates excellent piezoelectric properties. The piezoelectric material satisfies the following relational expression (1): 0.430?a?0.460, 0.433?b?0.479, 0.040?c?0.070, 0.0125?d?0.0650, 0.0015?e?0.0092, 0.9×3e?c?d?1.1×3e, a+b+c+d+e=1, where a, b, c, d, and e denote the relative numbers of Na, Nb, Ba, Ti, and Mg atoms, respectively.

Abstract: A piezoelectric device includes a piezoelectric body at least a portion of which can bend and vibrate, an upper electrode on an upper surface of the piezoelectric body and in which distortion of a crystal lattice is reduced as a distance from the upper surface of the piezoelectric body increases, a lower electrode on a lower surface of the piezoelectric body and in which distortion of a crystal lattice is reduced as a distance from the upper surface of the piezoelectric body increases, and a support substrate below the piezoelectric body, in which a recess extending from a lower surface of the support substrate toward the lower surface of the piezoelectric device is provided.

Abstract: A head comprises multiple nozzles on an ejection surface. The number n of nozzle rows each comprising a plurality m of nozzles arranged in a direction intersecting a first direction are disposed parallel to each other, where n and m are integers 2 or greater. Between the nozzles of each nozzle row, the nozzles of other of the nozzle rows are located as viewed in the first direction and the plurality of nozzles are located at the number m×n of dot positions. An interval defined by the number of dot positions from a dot position where one nozzle is arranged to a dot position just before a dot position where a next one of the nozzles is arranged in each row is referred to as nozzle pitch. At least one of the rows comprises two or more types of the nozzle pitches varying in the number of the dot positions.

Abstract: Provided is a lead-free piezoelectric material reduced in dielectric loss tangent, and achieving both a large piezoelectric constant and a large mechanical quality factor. A piezoelectric material according to at least one embodiment of the present disclosure is a piezoelectric material including a main component formed of a perovskite-type metal oxide represented by the general formula (1): Nax+s(1?y)(BiwBa1?s?w)1?yNbyTi1?yO3 (where 0.84?x?0.92, 0.84?y?0.92, 0.002?(w+s)(1?y)?0.035, and 0.9?w/s?1.1), and a Mn component, wherein the content of the Mn is 0.01 mol % or more and 1.00 mol % or less with respect to the perovskite-type metal oxide.

Abstract: A liquid discharge head including: a substrate having a liquid supply port; a flow channel forming member that is provided on the substrate and has discharge ports for discharging a liquid and a liquid flow channel that makes the liquid supply port and the discharge ports communicate with each other; and a support member that is provided on the substrate and arranged to be in contact with at least one surface of the flow channel forming member, with the one surface not being in contact with the liquid, wherein the flow channel forming member includes a cured product of a first photosensitive resin composition including a photosensitive resin, the support member includes a cured product of a second photosensitive resin composition including the epoxy resin A having a structure represented by formula (a1) or (a2) below in main chain structure: where, n1 and n2 represent integers of at least 2.

Abstract: A liquid ejecting head includes a channel forming body including a plurality of individual channels, a first manifold and a second manifold. The plurality of individual channels includes: a nozzle; a pressure chamber which is arranged to be apart from the nozzle in a first direction; a descender communicating the pressure chamber and the nozzle with each other, and extending in the first direction; a return channel including a first return channel and a second return channel, extending in a direction crossing the first direction, and having one end connected to the descender; and a communicating channel including a first communicating channel, and connecting the other end of the return channel to the second manifold. The first communicating channel connects the first return channel to the second manifold and connects the second return channel to the second manifold.

Abstract: An inkjet printing apparatus includes a printing unit having ejection parts, each configured to eject ink by using a piezoelectric element to be displaced in response to a change in electric potential. The inkjet printing apparatus also includes a circulation unit, a determination unit, and a control unit. The circulation unit executes ink circulation in a circulation path inclusive of the printing unit. The determination unit ejects the ink from each ejection part, detects residual vibration generated at an ejection part due to ink ejection, and determines an ejection state of ink ejection at the ejection part based on the detected residual vibration. The inkjet printing apparatus determines a printing state of ink ejection in the printing unit based on the ejection state. The control unit causes the determination unit not to make the ejection state determination in parallel with causing the circulation unit to execute the ink circulation.

Abstract: A method of manufacturing a liquid discharge head substrate is provided. The method includes forming a first substrate that includes a semiconductor element and a first wiring structure; forming a second substrate that includes a liquid discharge element and a second wiring structure; and bonding the first wiring structure and the second wiring structure such that the semiconductor element and the liquid discharge element are electrically connected to each other after the forming the first substrate and the second substrate.