Provided are a liquid jetting head and a liquid jetting device that prevent contamination of a humidity sensor. The liquid jetting head and the liquid jetting device include a nozzle that jets a liquid; a humidity sensor that is disposed further inside than the nozzle face where the nozzle is disposed; an air intake port that is disposed on the same plane as the nozzle face; a connection passage that allows the air intake port and the humidity sensor to communicate with each other; and a contamination preventing part that prevents contamination of the humidity sensor.

A liquid discharge apparatus is provided that includes a transport unit configured to transport a medium, a discharge unit configured to discharge a liquid onto the medium, a housing including therein the discharge unit, a humidifying unit configured to humidify an interior of the housing, and a humidity detection unit configured to detect a humidity. When the humidity detection unit detected a humidity less than a lower limit value (one example of a first predetermined value) (positive determination in step S12), the interior of the housing is humidified by the humidifying unit during transport by the transport unit or during discharge by the discharge unit (step S16).

A liquid discharge apparatus is provided that includes a discharge unit configured to discharge a liquid onto a medium, a support portion configured to support a portion of the medium, the liquid being discharged from the discharge unit onto the portion of the medium, a housing including therein the discharge unit, a humidity detection unit configured to detect a humidity, and a display control unit configured to display an indication prompting adjustment of a temperature or humidity when the humidity detection unit detects a humidity less than a lower limit value, and configured to display an indication prompting adjustment of a temperature or humidity when the humidity detection unit detects a humidity exceeding an upper limit value greater than the lower limit value.

An image recording apparatus includes a recording head including a plurality of nozzles from which ink is ejected, a memory, and one or more hardware processors coupled to the recording head and the memory. The one or more hardware processors are configured to: determine, for each of the plurality of nozzles, whether a position of the corresponding nozzle is a position to eject ink; determine whether a successive ejection operation is necessary for a nozzle out of the plurality of nozzles, whose position is determined as the position to eject ink; and cause ink to be successively ejected at the position to eject ink at a predetermined successive ejection frequency from the nozzle that is determined to have the necessity of the successive ejection operation.

A liquid ejection apparatus includes: an ejection head; a head scanning mechanism; a controller; and a storage, wherein the controller is configured to: perform, in a case where viscosity of the liquid satisfies a first condition, a first printing process of: discarding the liquid at a discard position and then printing a partial image; perform, in a case where viscosity of the liquid does not satisfy the first condition, the controller performs a second printing process of: printing the partial image on the recording medium, without discarding the liquid; perform, a division process of dividing the image data corresponding to at least first one pass of the image data into a first division data and a second division data; and, in the second printing process, the controller controls to eject the liquid based on the first division data and eject the liquid based on the second division data.

An image formation device includes a plurality of nozzles, a processor which forms an image on the basis of print data, and a memory which stores computer-readable instructions that, when executed by the processor, perform processes including, performing first ejection control which ejects a first amount of the ink at a timing of one of a forward path and a return path in the main scan direction, when printing is performed by a multi-pass method in which each of pixel arrays is printed by a plurality of main scans and, in each of the plurality of main scans, the ink is ejected onto the same pixel array from the respectively different nozzles, and performing second ejection control configured to eject a second amount of the ink at a timing different from the previous timing of the ejection of the ink, the second amount being smaller than the first amount.

The liquid discharging device includes a transporting unit disposed in a housing and configured to transport a medium placed outside the housing, a discharging unit configured to discharge liquid to the medium, a pre-heater configured to heat the medium and located upstream from a position where liquid is discharged by a discharging unit in a transport direction in which the medium is transported, an after-heater configured to heat the medium and located downstream, in the transport direction, from the position where the liquid is discharged, a detector configured to detect humidity outside the housing, and a control unit configured to control the pre-heater, wherein the medium is applied by a tension between a portion that contacts the transporting unit upstream from a position where the liquid is discharged in the transport direction, and a portion located downstream from the after-heater, and the control unit controls the pre-heater based on the humidity.

A liquid ejecting device includes a housing, an ejecting unit located in the housing that ejects liquid onto a medium, and a display unit that displays a recommended condition of an installation environment where a device is installed. The display unit displays, as the recommended condition, any of (a) a recommended temperature condition indicating a recommended temperature range, (b) a recommended relative humidity condition indicating a recommended relative humidity range, (c) a recommended absolute humidity condition indicating a recommended absolute humidity range, and (d) a recommended temperature condition and a recommended absolute humidity condition.

There is provided a liquid discharge apparatus, including: a conveyer; a head having a nozzle surface formed having a nozzle from which a liquid is discharged on a recording medium conveyed by the conveyer; a carriage carrying the head and configured to be movable in a scanning direction parallel to the nozzle surface in a movement range including a facing range that faces a passing area where the recording medium conveyed by the conveyer passes; a first conductor for detection arranged at a first side in the scanning direction relative to the passing area; and a second conductor for detection arranged at a second side, which is opposite to the first side, in the scanning direction relative to the passing area.

A control method of a liquid ejection apparatus including a liquid ejection head, a cap configured to seal a nozzle formation surface, and an ejection failure detector which performs a detection operation of detecting ejection failure of a nozzle, the control method including starting a vibration operation of continuously vibrating the liquid in the nozzle, after a liquid ejection operation is completed, starting the detection operation before a relative moving operation of relatively moving the liquid ejection head and the cap so as to face each other is completed, and stopping the vibration operation after the detection operation.