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.

A controller is configured to receive an output signal outputted from a light reception element. The controller is configured to perform: an existence detection of controlling a light emission element to emit light and detecting whether an ejection target exists at a facing position based on the output signal; and a distance detection of controlling the light emission element to emit light toward a surface of the ejection target and detecting a distance between the surface of the ejection target and a nozzle surface based on the output signal outputted from the light reception element upon receiving light reflected off the surface of the ejection target. An amount of change of the output signal with respect to change of the distance in the distance detection is larger than an amount of change of the output signal with respect to change of the distance in the existence detection.

A liquid discharging device includes: a recording head that has nozzles discharging liquid, and forms an image on a target surface with the liquid while performing scanning of the target surface for multiple times; a moving unit that moves the recording head in main-scanning direction while making the head discharge liquid, and moves the head in sub-scanning direction after the head has discharged liquid; a drive waveform applying unit that applies a drive waveform to the respective nozzles; a temperature detecting unit that detects temperature about the head; a correcting unit that corrects drive waveform based on detected temperature; and a control unit that, when temperature about the head changes from first temperature to second temperature, performs control in such a way that, during the multiple scans, use of second-type drive waveform corresponding to the second temperature gradually increases against use of first-type drive waveform corresponding to the first temperature.

An object of the present invention is to quickly correct a temperature sensor for an ejection head by, both efficiently and in a brief time, estimating a detected temperature of the temperature sensor for the ejection head in a case where the temperature of the ejection head of liquid becomes sufficiently close to an environment temperature. The temperature of a print head 1 is detected by a diode sensor 17 and the environment temperature is detected by a thermistor 10. Based on a change in the detected temperature of the diode sensor 17 at the time of filling of ink for the print head 1, the detected temperature of the diode sensor 17 in a case where the temperature of the print head 1 becomes close to the environment temperature is estimated as an estimated detected temperature. Based on a difference between the estimated detected temperature and the environment temperature, a correction value of the detected temperature of the diode sensor 17 is set.

A liquid ejection apparatus includes: a liquid ejection head that ejects a liquid from an ejection port; and a cap movable to a closed position at which the cap covers the ejection port and an open position which is separated from the closed position and at which the ejection port is open. The liquid ejection apparatus further includes: a recovery unit configured to perform a recovery process of recovering liquid ejection performance of the liquid ejection head; and a determination unit configured to determine whether abnormal termination occurred with the cap at the open position when the liquid ejection apparatus resumes operating. In a case where the determination unit determines that the abnormal termination occurred, the recovery process is controlled based on a temperature obtained by a temperature obtaining unit.

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.

A print head control circuit includes a first propagation wiring for propagating a clock signal input to a first terminal, a second propagation wiring for propagating a signal which is input to a second terminal and indicates a diagnosis result of a temperature abnormality detection circuit, and a fourth propagation wiring for propagating a second voltage signal input to a fourth terminal. When the second propagation wiring and the fourth propagation wiring are electrically coupled to a print head, the second propagation wiring and the fourth propagation wiring are electrically coupled to each other via the second terminal and the fourth terminal. The first propagation wiring and the second propagation wiring are located to be aligned. The first propagation wiring and the fourth propagation wiring are located to be adjacent to each other in a direction in which the first propagation wiring and the second propagation wiring are aligned.

A printing apparatus for printing using a printhead including a plurality of nozzles each configured to discharge ink and a plurality of sensors, corresponding to the plurality of nozzles, for detecting a discharge state of ink from the plurality of nozzles, judges a discharge state. More specifically, the apparatus prints, based on print data, an image by driving the printhead under a first drive condition to discharge the ink from the printhead to a first area, discharges ink to a second area different from the first area by driving the printhead, based on inspection data, under a second drive condition different from the first drive condition, and judges a discharge state of each nozzle by monitoring an output from each sensor at a timing of driving the printhead under the second drive condition.

An ink-jet recording apparatus includes: an ink-jet head provided with first and second nozzles for jetting a first ink and a second ink respectively, first and second drive elements which apply energy to the first and second inks respectively; a power supply circuit; and a controller. The controller estimates viscosity of the first ink in the first nozzle, controls the power supply circuit to generate a first drive voltage or a second drive voltage higher than the first drive voltage based on the viscosity of the first ink in the first nozzle estimated, drives the first and second drive elements by use of the drive voltage generated in the power supply circuit, and calculates a jetting amount of the first ink to be jetted from the first nozzle and a jetting amount of the second ink to be jetted from the second nozzle.

A method of controlling a liquid ejecting apparatus that includes a liquid ejecting head having nozzles configured to eject a liquid, pressure chambers communicating with the nozzles, and drive elements configured to change the volume in the pressure chambers, and a drive-waveform generating circuit configured to generate a drive waveform for driving the drive elements to vibrate the liquid in the nozzles is provided. The method includes detecting a power-off operation for issuing an instruction for turning off an electric power of the liquid ejecting apparatus and vibrating the liquid by driving piezoelectric elements by the drive waveform in response to detecting the power-off operation by the detecting.