A controller of an inkjet printer: calculates second density correction values for respective nozzles arranged in a predetermined direction to print a second line of an image data, by using gray-level values of pixels in the second line of the image data corresponding to the respective nozzles and first density correction values for the respective nozzles to print a first line of the image data printed immediately prior to the second line; and corrects the gray-level values of the pixels in the second line of the image data corresponding to the respective nozzles, by using the calculated second density correction values.

A liquid ejecting apparatus includes: an apparatus main body; a plurality of liquid ejecting heads that have a nozzle-formed surface; a unit base to which the plurality of liquid ejecting heads are fixed; and a lifting-lowering mechanism that is fixed to the apparatus main body and causes a position of the nozzle-formed surface to be shifted with respect to the apparatus main body. The lifting-lowering mechanisms are disposed in a direction orthogonal to a direction in which the plurality of liquid ejecting heads are aligned, in an in-plane direction of the nozzle-formed surface.

When a printing interruption cause occurs during printing of an image on a printing medium, printing of a page being printed is completed, and further only a position mark is printed on a printing resumption page. Then, a printing unit is stopped, and a conveyance speed is decelerated to stop conveyance of the printing medium. Next, the printing medium is rewound so that printing is resumed from the printing resumption page. Thereafter, the conveyance speed is accelerated to a predetermined speed, and printing is resumed from the printing resumption page on which the position mark is printed.

Provided is an inkjet recording apparatus that reduces clogging of nozzles, while at the same time avoid a decrease in productivity of the recording medium, and reduces situations in which the recording medium becomes stained due to the staining of opening portions and splashing due to ink ejected during flushing. A conveyor belt of the inkjet recording apparatus has a plurality of opening portion groups. The control unit determines the pattern of the plurality of opening portion groups used for flushing in one cycle of the conveyor belt according to the size of the recording medium. The control unit causes the recording medium to be supplied from the recording medium supply unit between the plurality of opening groups arranged in the conveying direction in the above pattern on the conveying belt and at positions separated from the opening portion groups by a specific distance or more.

A driving method enables a liquid feeding apparatus using a driving element in the form of a membrane to feed a liquid at high liquid feeding accuracy. To this end, a voltage applied to the driving element is controlled in such a way as to repeat a first period in which the voltage is changed from a first voltage to a second voltage and a second period which is a longer period than the first period and in which the voltage is changed from the second voltage to the first voltage, and such that an inflection point is provided in each predetermined interval during the first period based on a Helmholtz vibration period unique to the liquid feeding apparatus.

There is provided an ink-jet head including: first and second head chips each formed with two first nozzle arrays extending in a first direction, each of the first nozzle arrays including first nozzles corresponding to a first ink, second nozzles corresponding to a second ink, and third nozzles corresponding to a third ink; third and fourth head chips each formed with two third nozzle arrays extending in the first direction, each of the third nozzle arrays including fourth nozzles corresponding to the fourth ink. The first head chip to the fourth head chip are arranged in parallel in a second direction orthogonal to the first direction.

An inkjet head may include a plurality of nozzle holes that is two-dimensionally located in a nozzle formation surface facing a recording surface of a recording medium in a first direction parallel to a main-scanning direction orthogonal to a conveyance direction of the recording medium and in a sub-scanning direction parallel to the conveyance direction of the recording medium. Two nozzle holes that form dots adjacent in the main-scanning direction may be dispersedly located so as not to be adjacent in the sub-scanning direction. The two nozzle holes that form dots adjacent in the main-scanning direction are not separately located at one end and the other end in the sub-scanning direction of the plurality of nozzle holes that is two-dimensionally located.

Provided are a recording head capable of suppressing concentration unevenness at a connection portion of head modules, a method for producing the recording head, and a recording device having the recording head. A recording head of a recording device is configured such that a first head module in which an ejection amount of the liquid droplets of one end portion in the one direction of a head module, in which a plurality of nozzles for ejecting liquid droplets are arranged, is larger than an ejection amount of the liquid droplets of the other end portion opposite to the one end portion, and a second head module in which the ejection amount of the liquid droplets of the other end portion is larger than the ejection amount of the liquid droplets of the one end portion are alternately connected in the one direction.

After powered on, a check unit rewrites a lookup table in a memory of a programmable logic circuit unit to one of lookup tables in its own memory so as to switch a circuit state that a logic circuit implements. When the check unit outputs an inquiry signal in this state and an identification signal which responds to the inquiry signal is input into the check unit from a check circuit of a sub substrate via the logic circuit and a port, the sub substrate corresponding to the identification signal is specified as a connection destination of connectors. The circuit state of the logic circuit is optimized on the basis of a result of specification of the sub substrate as the connection destination obtained by repeating the above-mentioned operation.

A liquid discharge head includes a plurality of nozzles configured to discharge a liquid, a plurality of pressure chambers respectively communicating with the plurality of nozzles, a plurality of common-supply branch channels each communicating with two or more of the plurality of pressure chambers, a common-supply main channel communicating with each of the plurality of common-supply branch channels, a plurality of common-collection branch channels each communicating with two or more of the plurality of pressure chambers, and a common-collection main channel communicating with each of the plurality of common-collection branch channels. The plurality of nozzles is arrayed in a two-dimensional matrix in a first direction and a second direction intersecting with the first direction, the plurality of common-supply branch channels and the plurality of common-collection branch channels are alternately arranged in the second direction.