A liquid ejecting apparatus with a recording element substrate including an ejection port that ejects liquid, and a heating element that heats the liquid in order to eject the liquid from the ejection port; and at least a first temperature detecting element and a second temperature detecting element. The first temperature detecting element and the second temperature detecting element are formed at target positions centered on the center of the heating element when the recording element substrate is viewed in plan view.

A liquid ejection head in which, upon heating performed by a heating element, a bubble is formed in a liquid retained in a bubble forming chamber, the liquid is ejected, and the bubble disappears without any atmospheric communication. When a length L is a length of the heating element in a liquid supply direction, when viewing in a liquid ejection direction, a position of a center of gravity of an ejection port is spaced apart from a position of a center of gravity of the heating element by L/3.5 or more in the liquid ejection direction, and when a length of an ejecting portion in the liquid ejection direction is l and a length of the bubble forming chamber in the liquid ejection direction is h, l/h is 2 or smaller.

A liquid discharging head includes a discharge port that discharges a liquid, a pressure chamber that communicates with the discharge port, and an energy generating element that is disposed in the pressure chamber. In the liquid discharging head, the discharge port is provided with a plurality of projections that project towards a central portion of the discharge port from an inner peripheral edge of the discharge port, and an interval between the projections at a location where the projections are closest to each other is 5 m or less.

A liquid ejection method includes ejecting liquid from an ejection opening, using a liquid ejection head including a heating surface configured to heat the liquid and the ejection opening corresponding to the heating surface, by heating the liquid with the heating surface to produce a bubble communicating with air through the ejection opening such that at least a part of the heating surface is exposed to the air through the ejection opening, wherein the liquid is heated with the heating surface for 0.5 microseconds or shorter to produce a bubble communicating with the air through the ejection opening such that at least a part of the heating surface is exposed to the air through the ejection opening, in order to eject the liquid from the ejection opening.

A liquid jetting apparatus includes: individual channels; and a manifold commonly provided for the individual channels. Each of the individual channels has: a nozzle; a pressure chamber arranged away from the nozzle in a predetermined direction to extend along a plane orthogonal to the predetermined direction and connected to the manifold, a connecting channel connected to the pressure chamber to form at least a part of a channel communicating the pressure chamber and the nozzle, and a circulation channel connected to the connecting channel to form a part of a channel communicating the connecting channel and the pressure chamber. The connecting channel has a throttle, and the throttle has a smaller diameter along the plane orthogonal to the predetermined direction than a diameter, of a part of the connecting channel except the throttle, along the plane orthogonal to the predetermined direction.

Systems and methods for degassing fluid are disclosed. An example fluid ejection device including a channel having an entrance and an exit; a supply slot in communication with the channel; a vent; a first bubble impeding structure at the entrance of the channel; and a second bubble impeding structure at an exit of the channel, the first and second bubble impeding structures to retain a bubble within the channel to enable the bubble to be vented through a vent and to deter the bubble from entering the ink supply slot.

A recording element board includes a discharge orifice configured to discharge liquid, a pressure chamber communicating with the discharge orifice, a recording element configured to generate thermal energy to cause bubbling of the liquid, the recording element being disposed in the pressure chamber facing the discharge orifice, and a substrate on which the recording element is formed. When the recording element is driven and the liquid of within the pressure chamber is discharged, a generated bubble communicates with the atmosphere. A discharge orifice projection region where the discharge orifice has been projected on the substrate includes a region includes a region extending beyond a heat-generating region projection region where the heat-generating region of the recording element has been projected on the substrate, the outline of the discharge orifice projection region is circumscribed by the outline of the heat-generating region projection region.

A liquid discharge head includes a recording element configured to generate thermal energy and a discharge orifice disposed at a position facing the recording element. A bubble is generated in liquid by the thermal energy, liquid between the bubble and the discharge orifice is discharged from the discharge orifice by the pressure of the generated bubble, and the bubble communicates with the atmosphere on the outside of the discharge orifice.

A liquid ejection head in which, upon heating performed by a heating element, a bubble is formed in a liquid retained in a bubble forming chamber, the liquid is ejected, and the bubble disappears without any atmospheric communication. When a length L is a length of the heating element in a liquid supply direction, when viewing in a liquid ejection direction, a position of a center of gravity of an ejection port is spaced apart from a position of a center of gravity of the heating element by L/3.5 or more in the liquid ejection direction, and when a length of an ejecting portion in the liquid ejection direction is l and a length of the bubble forming chamber in the liquid ejection direction is h, l/h is 2 or smaller.

A liquid ejection head including a base substrate, an ejection port to eject a liquid, a heating element formed above the base substrate that heats the liquid to eject the liquid from the ejection port, a temperature detection element formed above the base substrate that detects a temperature of the liquid, a wiring layer connected to the heating element, a protective layer formed on the base substrate that protects the heating element and the wiring layer from the liquid, and a liquid supply port that penetrates the base substrate and supplies the liquid to the ejection port. When viewed in a direction perpendicular to the base substrate, the temperature detection element is disposed between the heating element and the liquid supply port, and the temperature detection element is formed on the protective layer.