A hydrophilic coating material including an alginate compound having a bond with a silane compound is used. The material is produced by reacting a water-soluble alginate compound and a silane compound and then by adding a divalent metal ion to an alginic acid-derived carboxyl group in the reaction product.

A liquid discharge head includes a plurality of recording element substrates each having an energy generating element configured to generate energy for discharging liquid from a discharge port, and a sealing member with which a surround of each of the plurality of recording element substrates is filled. Each of the plurality of recording element substrates includes a recessed portion formed on an end surface facing a neighboring recording element substrate, and in the recessed portion, a gap between neighboring recording element substrates is wider than a gap between element surfaces on which the energy generating element is provided.

In an inkjet recording head comprising a substrate including an energy-generating element that generates energy for ejecting a liquid, an ejection port for ejecting the liquid, and a liquid flow passage communicating with the ejection port, a liquid-repellent layer is formed on a surface of a member for forming the ejection port, and a liquid-repellent region and a liquid-nonrepellent region are formed on the same surface of the liquid-repellent layer by irradiating a part of the liquid-repellent layer with light including a wavelength decomposing the liquid-repellent component in the liquid-repellent layer.

In one example, a process for making a micro device structure includes molding a micro device in a monolithic body of material and forming a fluid flow passage in the body through which fluid can pass directly to the micro device.

In an embodiment, a fluid flow structure includes a micro device embedded in a molding, and a fluid feed hole formed through the micro device. A fluid channel is fluidically coupled to the fluid feed hole and includes a first compression molded channel segment and a second material ablated channel segment.

A liquid discharge head is provided which has a substrate, a flow channel forming member provided on a substrate surface of the substrate and forming a flow channel of a liquid, and a discharge port forming member provided on the flow channel forming member and having a discharge port through which a liquid is discharged, wherein the discharge port forming member and the flow channel forming member are formed of materials different from each other, a thickness of the flow channel forming member is greater than a thickness of the discharge port forming member in a direction perpendicular to the substrate surface, the discharge port forming member is a cured product of a photosensitive resin composition, and the flow channel forming member contains at least one resin selected from the group consisting of a polyether amide resin, a polyether imide resin and a polyether amide-imide resin.

Provided is a manufacturing method of a liquid ejection head, and the manufacturing method includes steps of: providing an ejection orifice forming member on one surface of a wafer, in which an energy-generating element is provided on the one surface of the wafer; forming a recess on the other surface of the wafer; and dicing the wafer along a plurality of dicing lines. The plurality of dicing lines include a dicing line extending in one direction and a dicing line extending in a direction crossing the one direction, and the recess is formed on each of positions overlapping the dicing lines except for an intersection part where the dicing line extending in the one direction intersects the dicing line extending in the direction crossing the one direction.

A piezoelectric device includes a diaphragm, a piezoelectric actuator, and an orientation layer between the diaphragm and the piezoelectric layer. The piezoelectric actuator has a first electrode, a piezoelectric layer, and a second electrode, with the first electrode, a piezoelectric layer, and a second electrode on the diaphragm. The orientation layer is a stack of two or more tiers.

A thin film manufacturing method of manufacturing a laminate of a thin film of a coating film member and a support member includes a coating step of coating the coating film member on a surface of the support member, a sandwiching step of sandwiching the coating film member between the support member and a peeled-off member, a film thinning step of reducing a thickness of the coating film member by applying an external force to the coating film member sandwiched between the support member and the peeled-off member in a state where the coating film member is softened, and a peeling step of peeling the peeled-off member off the coating film member after the film thinning step.

In an example implementation, a printhead includes a die sliver molded into a molding. The die sliver includes a front surface exposed outside the molding and flush with the molding to dispense fluid, and a back surface exposed outside the molding and flush with the molding to receive fluid. Edges of the die sliver contact the molding to form a joint between the die sliver and the molding.