Canon Kabushiki Kaisha

Keiji Tomizawa

Masaki Oikawa

Chiaki Muraoka

Toru Yamane

Ken Tsuchii

Mineo Kaneko

Mitsuhiro Matsumoto

Shuichi Murakami

Shuichi Ide

Takuma Kodoi

Kansui Takino

Mikiya Umeyama

Yuichiro Akama

Tomotsugu Kuroda

Naozumi Nabeshima

Shuzo Iwanaga

Akiko Hammura

Yoshihiro Hamada

Takuya Iwano

Tomoki Ishiwata

Masayuki Kyoshima

Yukuo Yamaguchi

Masataka Sakurai

Hiroaki Mihara

Yohei Hamade

Etsuko Sawada

Atsushi Omura

Toshikazu Nagatsuka

So Aizawa

Yoshiyuki Nakagawa

Keiichiro Tsukuda

Takaaki Yamaguchi

Yoshinori Misumi

Yuzuru Ishida

Genji Inada

Yasushi Iijima

Naoko Tsujiuchi

Shingo Nagata

Kenji Yabe

Satoshi Kudo

Souhei Tanaka

Tetsuya Saito

Tomohiro Sato

Shimpei Yoshikawa

Tomoko Kudo

Yosuke Miura

An aspect of the present disclosure is a liquid ejection apparatus including: a liquid ejection head including a conversion element that generates energy required to eject liquid, a first protection layer that blocks contact between the conversion element and the liquid, a second protection layer that partially covers the first protection layer and functions as a first electrode, a second electrode that is electrically connected to the first electrode through the liquid, and an ejection port that ejects the liquid, and a control unit configured to control a potential difference between the first electrode and the second electrode in printing to a predetermined value by changing at least one of potentials of the first electrode and the second electrode. The control unit sets the potential difference based on at least one of a condition and a configuration of the liquid ejection head.

Liquid ejection apparatus and control method

An aspect of the present invention is a liquid ejection apparatus including: a liquid ejection head including a heating element, a first protection layer, a second protection layer that functions as a first electrode, a second electrode that is electrically connected to the first electrode, and an ejection port; and a control unit configured to perform control of setting a potential difference between potentials of the first and second electrodes to a predetermined value by changing at least one of the potentials of the first electrode and the second electrode, in which the control unit sets the potential difference to a first value in a case where printing is performed, and the control unit sets the potential difference to a second value different from the first value and feeds power to at least one of a plurality of the heating elements in a case where printing is not performed.

One embodiment of the present invention is a liquid ejection apparatus having: a liquid ejection head including a heating element, a first protection layer that blocks contact between the heating element and liquid, a second protection layer that partially covers the first protection layer and functions as a first electrode, a second electrode that is electrically connected to the first electrode through the liquid, and an ejection port that ejects the liquid; and a control unit configured to perform control of setting a potential difference between the first electrode and the second electrode to a predetermined value in each of aging and printing by changing at least one of potentials of the first electrode and the second electrode, wherein ΔVa≠ΔVp is satisfied in the case where the potential difference in the aging is represented by ΔVa and the potential difference in the printing is represented by ΔVp.

A liquid ejection head that can suppress variation in the circulation flow rate or the pressure of the liquid among a plurality of pressure chambers and suppress a difference in temperature distribution between adjacent element substrates to suppress image unevenness includes a plurality of ejection modules including an element substrate in which a plurality of ejection orifices that eject a liquid are aligned in an array. In one ejection module of the ejection modules adjacent to each other, the liquid is supplied from one side of an ejection orifice array, and the liquid is collected from the other side of the ejection orifice array, and in the other ejection module of the ejection modules adjacent to each other, the liquid is supplied from the other side, and the liquid is collected from the one side.

Liquid ejection head and liquid ejection apparatus

In a liquid ejection head in which ejection modules are arrayed on a flow path forming member, each ejection module includes a recording element substrate provided on a support member. The recording element substrate includes a liquid supply channel, a liquid collection channel, and ejection ports. The support member includes supply-side liquid communication ports communicating with the liquid supply channel and collection-side liquid communication ports communicating with the liquid collection channel. The supply-side liquid communication ports and the collection-side liquid communication ports are alternately provided along the direction in which the ejection modules are arrayed. The closest pair of liquid communication ports in the adjacent ends of two adjacent ejection modules are both supply-side or collection-side liquid communication ports.

Liquid ejection head including a plurality of recording element substrates formed adjacent to each other to form an array such that a gap in temperature distribution is prevented

A liquid injection head improving electric reliability includes: a substrate including: energy generating elements configured to apply energy for ejection to a liquid, and a substrate upper surface on which terminals respectively connected to electric wirings are provided, an ejection port forming member having: an ejection port forming surface in which the ejection ports for ejecting a liquid are formed, and a back surface on a side opposite to the ejection port forming surface, which is arranged so as to opposite to the substrate upper surface, and a sealant configured to cover connecting portions between the electric wirings and the terminals.

Liquid ejection head and method of manufacturing the same

A liquid ejection head includes a substrate including an electrically insulating film, an energy generating element provided on the substrate and configured to generate energy used to eject a liquid, a flow path formed through the substrate and communicating with an ejection port configured to eject a liquid, and a wiring layer formed in the electrically insulating film of the substrate, used to drive the energy generating element, provided apart from a wall defining the flow path, and provided to surround the flow path in a plan view of the substrate.

A printing apparatus comprises: a plurality of printing elements; driving circuits that have at least one source follower transistor and correspond to each of the plurality of printing elements; and a control unit configured to, in a case where a number of printing elements driven simultaneously does not exceed a predetermined number, perform a first control for driving the at least one source follower transistor by a fixed pulse width irrespective of the number of printing elements driven simultaneously, and, in a case where the number of printing elements driven simultaneously exceed the predetermined number, perform a second control for changing a pulse width to drive the at least one source follower transistor based on the number of printing elements driven simultaneously.

Printing apparatus and method of controlling printhead

A liquid ejection head includes a substrate, a heat generating resistor element arranged on the substrate and a flow channel forming member for forming a flow channel. The flow channel forming member has a side wall surrounding at least part of the heat generating resistor element. The heat generating resistor element has a pair of oppositely disposed sides and a pair of electrical connection regions which extend along the respective ones of the pair of sides and are separated from the respective ones of the pair of sides by a distance. The side wall has at least one concave corner which is comprised of a curved surface or a surface extending obliquely to the pair of sides and the heat generating resistor element has at least one convex corner which faces the at least one concave corner of the side wall and is rounded or chamfered.

Liquid ejection head

A liquid discharge head includes a discharge unit that discharges a liquid as a result of electric energy being supplied to the discharge unit, a first wiring member that is joined to the discharge unit and that includes a plurality of first joining terminals each capable of transmitting the electric energy to the discharge unit, and a second wiring member that is electrically joined to the first wiring member and that includes a plurality of second joining terminals. At least three of the plurality of first joining terminals are inspection terminals that are short-circuited, and the second joining terminals are connected to contact terminals to each of which an external signal can be input.

Liquid discharge head

There are provided a liquid ejecting head, an ejecting element substrate and a liquid ejecting apparatus that can suppress degradation in print quality. Therefore in an ejecting element substrate arranged the closest to the center of a support member, a flow resistance of a flow passage corresponding to an ejection opening of an ejection opening array arranged the closest to the center of the ejecting element substrate is made high.

Liquid ejecting head, ejecting element substrate and liquid ejecting apparatus

A liquid discharge head includes a substrate having an element that discharges liquid by generating thermal energy to generate an air bubble in the liquid, and a liquid supply port for supplying the liquid to the element, and a flow path forming assembly including a flow path forming member having a discharge port for discharging the liquid and, between the substrate and the flow path forming member, a pressure chamber including the element disposed adjacent thereto and a flow path causing the pressure chamber and the liquid supply port to communicate with each other. In addition, an interlayer is provided on a joining portion of the substrate and the flow path forming member and provided so as to protrude from between the substrate and the flow path forming member into the flow path, and a protection layer including metal is formed so as to cover the element. The interlayer is not disposed on a boundary portion between the pressure chamber and the flow path, and the protection layer is disposed at least on the boundary portion.

Liquid discharge head and liquid discharge apparatus using the same

A method for stabilizing a refilling speed within a predetermined range even with various physical properties of liquid to be ejected is provided for a liquid ejection head using a thermal system. To achieve this, a drive pulse is controlled for each nozzle array according to the combination of a predetermined material and structure of a bubble-generating chamber and the physical property of the liquid to be ejected such that an amount of an overshoot and the refilling speed are within a predetermined range.

Method for controlling liquid ejection head and liquid ejecting apparatus

A liquid ejection head includes a discharge orifice configured to eject liquid; a device configured to generate energy for use in ejecting liquid; a pressure chamber partitioned by a wall, the pressure chamber accommodating the device and communicating with the discharge orifice; and a channel configured to supply liquid to the pressure chamber, wherein the discharge orifice has first and second protrusions protruding from the edge of the discharge orifice toward the central portion in an extending direction of the channel along the center line of the channel, and the interval between the base of the first protrusion and the base of the second protrusion in the extending direction of the channel is larger than the maximum interval between the edges of the discharge orifice in a direction perpendicular to the extending direction.

The print head includes an energy generating element, a chamber for accommodating liquid, and an ejection opening arranged in a position corresponding to the energy generating element. The ejection opening includes at least one projection projecting inside of the ejection opening, the ejection opening having a first region between a front end of the projection and an inner wall of the ejection opening positioned at the shortest distance from the front end, and second regions positioned on both sides of the projection and different from the first region, and when a width of the projection at a chamber-side opening face is represented as aand the maximum width of the projection is represented as a, a relation a&#x3c;ais established and the width of the projection decreases gradually or step by step from a position having the width of ato the chamber-side opening face.

Growing community of inventors

Yokohama, Japan

Keiji Tomizawa