In a printing apparatus including a circulation system circulating a liquid, a volatile component included in the liquid evaporates from an ejection opening and thus characteristics of the liquid involving with concentration, viscosity and the like change. The invention provides a printing apparatus including: a page wide type liquid ejection head that includes an ejection opening ejecting a liquid, a print element generating energy for ejecting a liquid, and a pressure chamber having the print element provided therein; a cap that covers the ejection opening; and a circulator configured to circulate the liquid so that the liquid passes through the pressure chamber, wherein a circulation of the liquid is started after the cap is opened and the circulation of the liquid is stopped in a case where an image forming operation of ejecting the liquid from the ejection opening on the basis of a job is ended.

A liquid containing member that can supply a liquid having a uniform concentration of a precipitating component to a liquid ejecting portion is provided. A liquid containing member includes: a liquid containing portion that can contain ink; a liquid supply port for supplying the ink contained in the liquid containing portion to a liquid ejection head; and a communication channel that is in communication with the liquid containing portion and the liquid supply port. The communication channel has a first end that is positioned at a lower end on the gravity direction side in the liquid containing portion and can suck the ink, and a second end that is positioned closer to the anti-gravity direction side than the first end is, and can suck the ink, in an in-use state in which the ink is supplied from the liquid supply port to the liquid ejection head.

A recording-element substrate includes a substrate including a base member, a pair of electrodes, a heating element formed of a thermal resistor layer between the electrodes, a surface on which an electroconductive film coating the heating element has been formed, and an insulating film between the heating element and the electroconductive film and a flow-path-forming member including walls forming a liquid flow path toward the heating element while being disposed on the substrate's surface side. The substrate includes an electric connecting portion in contact with the electroconductive film to connect the electroconductive film with the base member. The shortest distance between the electric connecting portion and a portion where an angle formed by the walls is 120 degrees or smaller when viewed from a direction orthogonal to the surface is smaller than that between a boundary between the electrodes and the heating element and the portion.

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.

An example provides a fluid ejection apparatus including a first firing resistor and a second firing resistor to selectively cause fluid to be ejected through a single nozzle, and a parasitic resistor arranged to add a parasitic resistance to the first firing resistor.

An ink manifold for use with a heater chip in an inkjet printhead, including a first planar surface and a second opposite planar surface, a plurality of ink channels located on the first planar surface of the ink manifold for supplying ink to the heater chip, and a plurality of ink ports located on the second opposite planar surface of the ink manifold, each of the plurality of ink ports being in liquid communication with a respective one of the plurality of ink channels, each of the plurality of ink channels having a bottom wall defined by bottom wall portions that rise from each ink port within the ink channel to a maximum height at an angle of at least 12 degrees.

An inkjet nozzle device includes a MEMS structure in contact with ink, wherein a tantalum oxide layer is deposited on at least part of the MEMS structure for inhibiting corrosion by the ink.

Provided is a liquid ejection head and a method for manufacturing the liquid ejection head, in which a capacitor can be disposed near an element substrate without increasing the size of the ejection head. To this end, a side surface of a support member includes a concave portion at a position facing an electronic component, the side surface intersecting with a support surface where the element substrate is supported.

Provided is a technique that enables voltages to be applied, with high precision, to an electrode layer for inhibition and removal of koge while suppressing increase in the size a substrate. A liquid ejection head substrate includes: electrothermal conversion elements that apply heat to a liquid; an upper electrode part in which a plurality of upper electrodes that protect the electrothermal conversion elements are formed at positions where the upper electrodes come into contact with the liquid; a counter electrode part which is provided to correspond to the upper electrode part and in which a plurality of counter electrodes are formed to be electrically connectable to the upper electrodes via the liquid; and a generation unit that generates a voltage to be applied to at least one of the upper electrode part and the counter electrode part.

A liquid ejection head comprises a liquid ejection substrate for ejecting a liquid, wherein the liquid ejection substrate includes a flow passage forming substrate and a support substrate which is bonded to the flow passage forming substrate via an adhesive, the flow passage forming substrate includes a common flow channel which communicates with a flow passage formed in the support substrate and an individual flow channel which communicates with the common flow channel, and among a corner portion of an end portion of the common flow channel, an angle of the corner portion which is closest to the individual flow channel is larger than 90.