Abstract: Provided is a liquid ejection head for ejecting a liquid while being scanned in a main scanning direction, including: a circulation pump capable of supplying the liquid from a supply channel into a pressure chamber, and collecting the liquid in the pressure chamber through a collection channel and sending the liquid to the supply channel; a first pressure adjustment unit disposed between an outlet channel of the circulation pump and the supply channel; a second pressure adjustment unit disposed between an inlet channel of the circulation pump and the collection channel. At least one of the first pressure adjustment unit or the second pressure adjustment unit is configured such that pressures with different signs relative to a pressure at rest are generated in response to a forward scan and a backward scan in the main scanning direction.

Abstract: An image forming apparatus includes an electrostatic latent image bearer, an electrostatic latent image former, a developing device, a transfer device, and a fixing device. The electrostatic latent image former forms an electrostatic latent image on the electrostatic latent image bearer. The developing device develops the electrostatic latent image with a developer to form a toner image. The transfer device transfers the toner image on a recording medium. The fixing device fixes the toner image on the recording medium. The developer contains an adhesive medium and foamable particles.

Abstract: A liquid discharge head includes an element substrate including an energy generation element configured to generate energy for discharging liquid from a discharge port, and a supporting member which supports the element substrate and in which a liquid chamber configured to supply liquid to the discharge port is formed, wherein a recessed portion communicating with the liquid chamber is formed at a position above the liquid chamber in a vertical direction in an orientation of the liquid discharge head when used, and wherein at least one of surfaces forming the recessed portion is formed of a flexible member configured to absorb vibration of liquid in the liquid chamber.

Abstract: A liquid ejection head includes an element substrate having an energy-generating element configured to generate an energy for ejecting a liquid from an ejection orifice, a support member for supporting the element substrate, the support member including a liquid chamber formed therein to supply the liquid to the ejection orifice, and a damper portion for absorbing vibration of the liquid inside the liquid chamber, the damper portion being flexible. The support member has a through-hole for communicating with the liquid chamber at a position located above the liquid chamber in a vertical direction when the liquid ejection head is in a use orientation. The damper portion has a taper portion that tapers downwardly in the vertical direction and is positioned in such a manner that the tapering portion closes the through-hole, and the damper portion and the support member are attached to each other by a fixing member.

Abstract: An image forming apparatus includes an image bearer, a protectant applicator, a heating device, and a protectant biasing member. The protectant applicator applies protectant to the image bearer. The heating device includes a heater including a base, a heat generator, an electrode, and a conductor coupling the heat generator to the electrode. The heater has a first position and a second position having a higher temperature than the first position. These are symmetrical to each other with respect to a longitudinal center of a heat generation area of the heater. The protectant biasing member biases the protectant to the protectant applicator with a first biasing force at a position closer to the first position than to the second position and with a second biasing force larger than the first biasing force at a position closer to the second position than to the first, and the protectant contacts the protectant applicator.

Abstract: A liquid filling method of filling a liquid storage device including a first tank that stores a liquid to be supplied to an ejection head ejecting the liquid and a second tank that stores the liquid to be supplied to the first tank through a connection port provided in the first tank with the liquid, the method including: injecting the liquid from a liquid storage container into the first tank through a first liquid introduction port provided in the first tank, in a state where a second liquid introduction port provided in the second tank is closed.

Abstract: An image forming apparatus includes an image bearer, a protectant applicator, a heating device, and a protectant biasing member. The protectant applicator applies protectant to the image bearer. The heating device includes a heater including a base, a heat generator, an electrode, and a conductor coupling the heat generator to the electrode. The heater has a first position and a second position having a higher temperature than the first position. These are symmetrical to each other with respect to a longitudinal center of a heat generation area of the heater. The protectant biasing member biases the protectant to the protectant applicator with a first biasing force at a position closer to the first position than to the second position and with a second biasing force larger than the first biasing force at a position closer to the second position than to the first, and the protectant contacts the protectant applicator.

Abstract: A liquid ejection apparatus includes: a recording head that ejects liquid; a sub-tank that is connected to the recording head and temporarily stores the liquid to be supplied to the recording head; a liquid tank that communicates with the sub-tank and is able to be filled with the liquid; a first atmosphere opening unit that is provided in the liquid tank; and a second atmosphere opening unit that is provided in the sub-tank. The second atmosphere opening unit is closable when the liquid tank is filled with the liquid, and the first atmosphere opening unit and the second atmosphere opening unit are able to open the liquid tank and the sub-tank to the atmosphere, respectively, when the sub-tank is filled with the liquid filled in the liquid tank by a hydraulic head pressure.

Abstract: A liquid discharge head includes an element substrate including an energy generation element configured to generate energy for discharging liquid from a discharge port, and a supporting member which supports the element substrate and in which a liquid chamber configured to supply liquid to the discharge port is formed, wherein a recessed portion communicating with the liquid chamber is formed at a position above the liquid chamber in a vertical direction in an orientation of the liquid discharge head when used, and wherein at least one of surfaces forming the recessed portion is formed of a flexible member configured to absorb vibration of liquid in the liquid chamber.

Abstract: A liquid ejection head includes an element substrate having an energy-generating element configured to generate an energy for ejecting a liquid from an ejection orifice, a support member for supporting the element substrate, the support member including a liquid chamber formed therein to supply the liquid to the ejection orifice, and a damper portion for absorbing vibration of the liquid inside the liquid chamber, the damper portion being flexible. The support member has a through-hole for communicating with the liquid chamber at a position located above the liquid chamber in a vertical direction when the liquid ejection head is in a use orientation. The damper portion has a taper portion that tapers downwardly in the vertical direction and is positioned in such a manner that the tapering portion closes the through-hole, and the damper portion and the support member are attached to each other by a fixing member.

Abstract: A liquid filling method of filling a liquid storage device including a first tank that stores a liquid to be supplied to an ejection head ejecting the liquid and a second tank that stores the liquid to be supplied to the first tank through a connection port provided in the first tank with the liquid, the method including: injecting the liquid from a liquid storage container into the first tank through a first liquid introduction port provided in the first tank, in a state where a second liquid introduction port provided in the second tank is closed.

Abstract: A liquid ejection apparatus includes: a recording head that ejects liquid; a sub-tank that is connected to the recording head and temporarily stores the liquid to be supplied to the recording head; a liquid tank that communicates with the sub-tank and is able to be filled with the liquid; a first atmosphere opening unit that is provided in the liquid tank; and a second atmosphere opening unit that is provided in the sub-tank. The second atmosphere opening unit is closable when the liquid tank is filled with the liquid, and the first atmosphere opening unit and the second atmosphere opening unit are able to open the liquid tank and the sub-tank to the atmosphere, respectively, when the sub-tank is filled with the liquid filled in the liquid tank by a hydraulic head pressure.

Abstract: The present invention provides a liquid ejecting head in which a chip crack is unlikely to occur. To achieve this, a liquid ejecting head includes an element substrate having energy generating elements arranged on the front face of the element substrate in its longitudinal direction and a channel member having ejection ports formed to correspond to the energy generating elements, respectively. In the element substrate, a supply port for supplying liquid is formed so as to pierce through from a back face to a front face of the element substrate, and inside the supply port, a beam is formed at a position closer to an end of the supply port rather than a center thereof in its longitudinal direction to connect facing inner walls of the supply port in its lateral direction.

Abstract: A liquid ejection head for ejecting a liquid includes a substrate provided with an energy generating element and a liquid supply port; a flow path forming member including an ejection opening for ejecting a liquid; and a pressure chamber communicating with the ejection opening and including the energy generating element therein and a flow path through which the pressure chamber and the liquid supply port communicate with each other, the pressure chamber and the flow path being provided between the substrate and the flow path forming member. A portion of the flow path forming member which extends from an area facing the liquid supply port to an area facing a part of the flow path extending from the liquid supply port to the pressure chamber has a thickness greater than that of a portion of the flow path forming member which faces the pressure chamber.

Abstract: A liquid ejection head for ejecting a liquid includes a substrate provided with an energy generating element and a liquid supply port; a flow path forming member including an ejection opening for ejecting a liquid; and a pressure chamber communicating with the ejection opening and including the energy generating element therein and a flow path through which the pressure chamber and the liquid supply port communicate with each other, the pressure chamber and the flow path being provided between the substrate and the flow path forming member, wherein a portion of the flow path forming member which extends from an area facing the liquid supply port to an area facing a part of the flow path extending from the liquid supply port to the pressure chamber has a thickness greater than a portion of the flow path forming member which faces the pressure chamber.

Abstract: A liquid discharge head including a substrate having a plurality of energy-generating elements which generates energy used to discharge a liquid, and a supply port which is a through-hole for supplying the liquid to the energy-generating elements and which extends along an arrangement direction of the plurality of the energy-generating elements; and a discharge port forming member having a plurality of discharge ports for discharging the liquid and a pair of beam-shaped projections which are parallel to each other, which project toward the substrate, and which are formed along the arrangement direction at positions opposing to the supply port, wherein an interval of the pair of beam-shaped projections is larger than a length of the pair of beam-shaped projections in a direction orthogonal to the arrangement direction of the pair of beam-shaped projections.

Abstract: A liquid ejection head includes a first recording element substrate, a second recording element substrate, and an electric wiring substrate. The first and second recording element substrates each includes an energy generating element that generates energy for ejecting a liquid, and an electroconductive protective film that is disposed so as to cover at least the energy generating element. The electric wiring substrate includes wiring for supplying electric power to the first and second recording element substrates. The electroconductive protective film of the first recording element substrate and the electroconductive protective film of the second recording element substrate are electrically connected to each other through the electric wiring substrate.

Abstract: A liquid discharge head including a substrate having a plurality of energy-generating elements which generates energy used to discharge a liquid, and a supply port which is a through-hole for supplying the liquid to the energy-generating elements and which extends along an arrangement direction of the plurality of the energy-generating elements; and a discharge port forming member having a plurality of discharge ports for discharging the liquid and a pair of beam-shaped projections which are parallel to each other, which project toward the substrate, and which are formed along the arrangement direction at positions opposing to the supply port, wherein an interval of the pair of beam-shaped projections is larger than a length of the pair of beam-shaped projections in a direction orthogonal to the arrangement direction of the pair of beam-shaped projections.

Abstract: A liquid ejection apparatus includes an energy generating element that generates energy for ejecting a liquid; a plurality of electroconductive protective films that are disposed so as to cover at least the energy generating element and that are in contact with the liquid; and an electrifying unit that is capable of electrifying the plurality of electroconductive protective films in such a way that surfaces of the electroconductive protective films in contact with the liquid serve as anodes.

Abstract: A manufacture method can form an inkjet printing head by which a plurality of ejection openings have a uniform shape. Heaters adjacent to one another have thereamong a common conductive line commonly connected to these heaters or a dummy conductive line not involved in the energization of the heaters.