A liquid discharge device to perform recording by use of a liquid discharge head including discharge ports to discharge a liquid, pressure generation elements to generate energy to be used to discharge the liquid, and pressure chambers communicating with the discharge ports. The liquid discharge device includes: a control unit to control a temperature of the liquid discharge head by applying heat with heating elements arranged in divided areas of a region of the liquid discharge head where the discharge ports are arranged. When there is recording data for the discharge port in a certain one of the divided areas, the control unit causes the heating element in the divided area to generate heat, and when there is no recording data for the discharge port in the certain divided area, the control unit keeps the heating element in the certain divided area from generating heat.

A printing element substrate includes a substrate, an energy generating element, and an ejection-port formed member. The energy generating element is disposed on one surface of the substrate and configured to generate energy for use in ejecting liquid. The ejection-port formed member includes ejection ports that eject the liquid. A protrusion protruding toward inside of each of the ejection ports is provided on an inner surface of the ejection port. In a surface of the ejection-port formed member remote from the substrate, a tip portion of the protrusion is positioned closer to the substrate than an outer periphery of the ejection port.

A method for manufacturing a structure includes, preparing a substrate with a recessed portion provided therein, attaching a film including a photosensitive resin layer containing photosensitive resin therein and a support layer to the substrate to cover the recessed portion with the photosensitive resin layer, irradiating the photosensitive resin layer covering the recessed portion with light via the support layer to form a latent image pattern on the photosensitive resin layer, heating the photosensitive resin layer at 30 degrees Celsius or higher and X degrees Celsius or lower for one minute or longer, wherein a softening point of the photosensitive resin is X degrees Celsius (X≧30), separating the support layer from the photosensitive resin layer, heating the photosensitive resin layer at X+10 degrees Celsius or higher, and carrying out development on the photosensitive resin layer.

A liquid ejection head includes a plurality of liquid chambers each including an energy generating element that generates energy for ejecting a liquid, an ejection opening that ejects the liquid, and a liquid supply opening that supplies the liquid, the liquid flowing in a first direction in the plurality of liquid chambers, and the plurality of liquid chambers being arranged in a second direction that intersects the first direction, and a plurality of first side walls that extend in the first direction and that form walls on both sides of the plurality of liquid chambers. In the liquid ejection head, each of the plurality of first side walls includes a fragmenting portion that fragments each of the plurality of first side walls in the first direction.

A fluid ejection device may include a first channel having a first end and a second end, a first drop ejector along the first channel, a second channel having a first end and a second end, a second drop ejector along the second channel, a third channel extending between and connecting the first end of the first channel and the first end of the second channel, a fourth channel extending between and connecting the second end of the firs channel and the second end of the second channel and a fifth channel extending between and connecting the third channel and the fourth channel.

Provided is a method of producing a structure including a substrate having openings in a first surface and a lid structure formed on the first surface and having an opening portion communicating with a part of the openings. The method includes preparing a laminate by forming a layer containing a photosensitive resin composition on a base film, stacking the laminate on the first surface such that the first surface is in contact with the photosensitive resin composition-containing layer, and forming a pattern for the opening portion of the lid structure in the photosensitive resin composition-containing layer by pattern exposure of the layer through the base film. The maximum scattering light intensity of the base film at a scattering angle of 10° or more is 1/100000 or less of the light intensity at a scattering angle of 0°, at a wavelength of 400 nm.

A liquid ejection head includes a pressure chamber that allows a first liquid and a second liquid to flow inside, a pressure generation element that applies pressure to the first liquid and an ejection port that ejects the second liquid. In a state where the first liquid flows in a direction, crossing a direction of ejection of the second liquid from the ejection port, while being in contact with the pressure generation element and the second liquid flows in the crossing direction along the first liquid in the pressure chamber, the second liquid is ejected from the ejection port by causing the pressure generation element to apply a pressure to the first liquid.

A liquid ejection head comprises a plurality of ejection orifices for ejecting liquid, a liquid supply flow path for supplying liquid to the plurality of ejection orifices and a plurality of branch flow paths branched from the liquid supply flow path each being held in communication with corresponding one of the plurality of ejection orifices. The plurality of ejection orifices form a first row and a second row each extending in parallel with each other. The first and second rows of ejection orifices are partially overlapping with each other as viewed in the direction orthogonal relative to the extending direction. The flow rate in the branch flow paths held in communication with the ejection orifices located in the overlapping part is made greater than the flow rate in the branch flow paths held in communication with the ejection orifices located in the non-overlapping part.

A pressure chamber of each of channels of an inkjet head has a non-rotating body shape around an axis perpendicular to a support substrate on which the pressure chamber is formed. The direction of the pressure chamber corresponding to a rotation angle from a reference position around the axis passing through the pressure chamber is defined as the direction of the pressure chamber. A plurality of channels arranged in a same row in a direction parallel to the substrate includes channels and having the pressure chamber facing different directions. In a same row, channels (e.g. channel 21a.sub.1) driven by a same circuit element (e.g. circuit element) are arranged such that the pressure chambers face a same direction.

Printheads and printers are described herein. In one example, a printhead includes a number of drop generators disposed in a first array and a second array. The drop generators in both the first array and the second array are spaced one dot pitch apart perpendicular to the motion of a print medium, and alternate between a high drop weight (HDW) drop generator and a low drop weight (LDW) drop generator. Each drop generator in the first array is in a line of the motion of the print medium with a corresponding drop generator in the second array, wherein each HDW drop generator in the first array is in line with an LDW drop generator in the second array, and each LDW drop generator in the first array is in line with an HDW drop generator in the second array.