Canon Kabushiki Kaisha

Michinari Mizutani

Shuichi Murakami

Masayoshi Tachihara

Takashi Inoue

Mineo Kaneko

Torachika Osada

Yasuyuki Tamura

Yuichiro Akama

Norihiro Kawatoko

Yasunori Takei

Tomoyuki Inoue

Hiroshi Tajika

Akihiro Yamanaka

Hiroshi Yamada

Shogo Kawamura

Yoshihiro Hamada

Toshikazu Nagatsuka

Yuji Konno

Tetsuya Edamura

Ken Tsuchii

Masaki Oikawa

Mikio Sanada

Miyuki Fujita

Takayuki Ogasahara

Tamaki Sato

Tetsuhiro Maeda

Yasutomo Watanabe

Takuma Kodoi

Suguru Taniguchi

Kenichi Ueyama

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.

Liquid ejection head and liquid ejection apparatus

Provided are a liquid ejecting method, a liquid ejecting device, and a liquid ejecting system which can avoid damage of an electro-thermal conversion element caused by cavitation and can prolong a life thereof even in a case that handling with a configuration of an ejecting port is difficult. For that purpose, ejection is performed for a low-duty region by controlling such that variation in an ejection speed is made smaller, and ejection is performed for a high-duty region by controlling such that variation in the ejection speed is made larger.

Liquid ejecting method, liquid ejecting device, and liquid ejecting system

Provided is a recording method for performing recording by ejecting liquid to a recording medium, the recording method including: preparing a liquid ejection head including an ejection orifice array in which multiple ejection orifices for ejecting the liquid are arranged; and ejecting multiple liquid droplets from the multiple ejection orifices while the recording medium and the liquid ejection head are relatively moved at a speed of 40 inch/s or more to fill a predetermined pixel area on the recording medium with the multiple liquid droplets. A relationship A/12&#x2266;b&#x2266;25&#x2212;A/5 is satisfied, where A (inch/s) represents the speed of the relative movement and b (pl) represents an amount of a liquid droplet ejected by one ejection.

Recording method

An inkjet recording apparatus includes an inkjet recording head including a first nozzle having a discharge port, a pressure chamber having therein an element, and a flow path, a second nozzle having a flow resistance lower than that of the first nozzle, and a supply port configured to, after discharge of an ink droplet from at least one of the first nozzle and the second nozzle, supply ink to the nozzle, a storage unit storing a rank value depending on a size of a portion relating to the flow resistance, a reading unit configured to read the rank value, a determination unit configured to determine a number of discharges per unit time of each nozzle based on the rank value read by the reading unit, and a control unit configured to control each nozzle to discharge the ink droplet based on the number of discharges determined by the determination unit.

Inkjet recording apparatus and inkjet recording method

A liquid ejection head in which the adverse effect of a heating resistor element due to cavitation is reduced and a printing apparatus employing this liquid ejection head are provided. When a length of a heating resistor element in a direction in which ink is to be supplied is defined by L, the center of an ejection port is shifted, at a distance equal to or longer than L/7 toward a location of an ink supply port, from the center of the heating resistor element, viewed in a direction in which ink is to be ejected. When a length of the ejection portion in the direction in which ink is to be ejected is defined as l and a length of a bubble generation chamber in the direction in which the liquid is to be ejected is defined as h, l/h is equal to or less than 2.

Liquid ejection head, liquid ejection method, and printing apparatus employing this ejection head

The present invention provides an ink jet printing apparatus and an ink jet printing method in which if an image is printed using ink and a process liquid serving to improve the printability of the ink, degradation of print image quality can be suppressed which results from a rise in the temperature of a print head. To achieve this, the present invention reduces the amount of process liquid ejected from a process liquid ejection section capable of ejecting a process liquid, with increasing temperature of an ink ejection section capable of ejecting ink.

Ink jet printing apparatus and ink jet printing method utilizing ink and process liquid

A liquid ejecting head includes: an orifice plate provided with an ejection port forming face which has an ejection port row formed thereon, the ejection port row including a plurality of ejection ports which eject a liquid arrayed in a first direction, wherein each of the ejection ports is formed inside a plurality of grooves which are provided on the ejection port forming face and extend in a second direction that intersects with the first direction, and with respect to a cross section of the groove in the first direction, which includes centers of the ejection ports, the groove has an inner wall surface in a circular arc shape, and the groove has an aperture larger than an aperture of the ejection port, in the first direction.

Liquid ejecting head

An adverse effect of air flows occurring near the nozzle line with high print duty is reliably avoided by appropriately dividing and allocating the print data to a plurality of ink ejection nozzle lines. When the print head is scanning in a forward direction, a combination of a magenta ink nozzle line and a yellow ink nozzle line that do not adjoin each other is mainly used. When the print head is scanning in a backward direction, another combination of a magenta ink nozzle line and a yellow ink nozzle line that do not adjoin each other is mainly used.

Ink jet printing apparatus and ink jet printing method

A liquid ejection head according to the present invention includes a plurality of ejection openings arranged in a first direction and a plurality of electro-thermal transducers for ejecting liquid from the ejection openings, the liquid ejection head and a printing medium being subjected to the relative movement, wherein an arrangement pitch of the ejection openings forming an end group located in the respective opposite end section along the first direction is longer than an arrangement pitch of the ejection openings forming a central group located in the central section along the first direction. According to the present invention, it is possible to eliminate white streaks which may generate in a solid printing.

Liquid ejection head and image-forming apparatus using the same

The present invention relates to measures for preventing end deviation that may occur during high-duty printing such as one-pass printing, and in particular, to measures for preventing density unevenness (white stripes) in the case of ink with a low lightness such as black ink. According to the present invention, the amount of black ink ejected through the corresponding ejection ports is set to be larger than that of color ink ejected through the corresponding ejection ports. Two black ink ejection chips each having at least one black ink ejection port row are arranged on the respective sides of a color ink ejection chip.

Ink jet print head and printing method and apparatus using the same

An object of the present invention is to provide an ink jet recording apparatus which can keep an adequate absorptivity of an ink absorbing member for a long period of time, even when such inks which react with each other are sucked through the same cap in a sucking recovery operation, by preventing a mixed ink collected by the ink absorbing member from thickening or being solidified. The ink jet recording apparatus has: a recovery unitandfor draining ink from a black-ink discharge portionfor discharging black ink and a color-ink discharge portionfor discharging color ink which reacts with the black ink; an ink absorbing memberfor collecting the ink which is drained by the recovery unit and separating the ink into a solid partand a liquid part; and an ink introduction unitfor introducing the ink which is drained by the recovery unit, into the ink absorbing member.

Ink jet recording apparatus

There is provided a liquid ejecting method using a liquid ejection head including a first ejection port for ejecting an ink containing a color material, a first energy generating element for generating energy utilized for ejecting the ink from the first ejection port, a second ejection port for ejecting an improvement liquid for improving recording property of the ink, and a second energy generating element for generating energy utilized for ejecting the improvement liquid from the second ejection port. The method includes ejecting the ink from the first ejection port by driving the first energy generating element, and ejecting the improvement liquid from the second ejection port by driving the second energy generating element, in a state where a liquid level of the improvement liquid in the second ejection port has moved forward in a liquid ejection direction than a liquid level of the ink in the first ejection port when the first energy generating element is driven.

Liquid ejection method for ejecting an ink containing a color material and an improvement liquid

There is provided an ink jet printing apparatus and a printing method capable of reducing unevenness due to a time lag. An ink jet printing apparatus comprise a printing head including a first and a second eject port array. The second eject port array is shorter than said first eject port array in said conveying direction of the printing medium. The first eject port array has a first a second. The first eject port group is disposed parallel to said second eject port array. The second eject port group is not disposed parallel to the second eject port array. In an identical printing area of the printing medium, a printing ratio of the first eject port group is lower than that of the second eject port group. The second ink contains a component that reduces dispersion stability of the first ink.

A liquid recording head for effecting recording by ejecting droplets from a plurality of ejection outlets formed on a substrate is provided. The liquid recording head includes a plurality of large droplet ejection outlets each having a relatively large ejection amount, a plurality of small droplet ejection outlets each having a relatively small ejection amount, energy generating elements for generating energy for ejecting the droplets from the plurality of large droplet ejection outlets and the plurality of small droplet ejection outlets, a liquid chamber for retaining liquid to be ejected from the plurality of large droplet ejection outlets or the plurality of small droplet ejection outlets, at least two first flow passages for establishing communication between the liquid chamber and one of the large droplet ejection outlets, and second flow passages for establishing communication between the liquid chamber and the small droplet ejection outlets.

Growing community of inventors

Kanagawa, Japan

Michinari Mizutani