A recording apparatus includes a recording head configured to discharge a liquid onto a recording medium to form an image, a heating unit configured to heat the recording medium, a first temperature sensor disposed in the recording head and configured to detect a temperature of the recording head, and a second temperature sensor configured to detect a temperature around the recording head, wherein a correction value for correcting the temperature of the recording head is calculated based on results of detection by the first temperature sensor and the second temperature sensor during a period from when the recording apparatus is powered on to when the heating unit is driven.

In a flow path unit, ink flows toward a recording head that ejects the ink. The flow path unit includes a flow path portion, a temperature adjustment unit, and a compression coil spring. The flow path portion is formed of metal and includes a supply pipe through which the ink flows. The temperature control unit heats the supply pipe. The compression coil spring is formed of metal and is attached to an inner surface of the supply pipe. The ink can come into contact with the compression coil spring, and the compression coil spring enables the ink to flow downstream in the supply pipe.

In a droplet discharge method, a plurality of grids corresponding to areas of a substrate are set. A discharge amount for each grid is determined based on a difference in discharge amount according to a temperature change of ink to be discharged from nozzles that are designated for the plurality of grids respectively. An ink drop map for discharging ink having the discharge amount for each grid is created. Droplets are discharged through the nozzles according to the ink drop map to form a thick film having a predetermined thickness on the substrate.

A liquid ejection head includes a plurality of nozzle arrays extending along a first direction and through which liquid is ejected towards a second direction perpendicular to the first direction, a plurality of substrates extending along the first and second directions, the substrates corresponding to the nozzle arrays, a plurality of heat generating circuits each disposed on a corresponding one of the substrates, a temperature control structure that contacts the heat generating circuits for controlling temperature thereof, and one or more plate springs each biased to push one or more of the heat generating circuits against the temperature control structure.

An inkjet printer that includes an inkjet head in which a plurality of ink flow paths are formed is provided. In this inkjet printer, a plurality of nozzles from which ink is ejected and a plurality of ink flow paths to which the plurality of nozzles are connected are formed in an inkjet head. The inkjet head includes a plurality of ejection energy generation elements that make the plurality of respective nozzles eject ink. Based on an ink flow rate which is a flow rate of ink flowing into each of the plurality of ink flow paths and internal temperature or external temperature of the inkjet head, a controller of the inkjet printer estimates the ink temperature in each of the plurality of ink flow paths, and controls drive voltage applied to the plurality of ejection energy generation elements based on the result of the estimation.

A drive unit is configured to generate a drive signal for driving a liquid ejecting head unit. The drive unit includes a drive board on which a drive circuit configured to generate the drive signal is mounted; a thermal conductive material that is in contact with the drive circuit on an opposite side in relation to the drive board; a water cooling mechanism that is in contact with the thermal conductive material on an opposite side in relation to the drive circuit; a pump that causes liquid in the water cooling mechanism to flow; and a control circuit that controls operation of the pump. The control circuit switches a direction in which the pump causes the liquid to flow between a forward direction and a reverse direction that is an opposite of the forward direction.

A head substrate provided on a liquid discharging head, comprising an electrothermal conversion element configured to generate heat for causing liquid to be discharged, one or more first switch elements configured to drive the electrothermal conversion element, a temperature detection element configured to detect a temperature of the electrothermal conversion element, and one or more second switch elements configured to control the temperature detection element, wherein a well layer that forms the first switch elements and a well layer that forms the second switch elements are electrically isolated by a deep element isolation portion formed to be deeper than the well layers.

A print head includes an ejection module that ejects a liquid by receiving a corrected drive signal, wherein the ejection module includes a piezoelectric element including a piezoelectric body, the piezoelectric body being located between a first electrode and a second electrode, a pressure chamber substrate located on one side of the vibration plate in the stacked direction and provided with a pressure chamber whose volume changes due to deformation of the vibration plate, a nozzle that ejects a liquid according to a change in volume of the pressure chamber, and a temperature detection unit that is located on the other side of the vibration plate, wherein the drive signal is corrected based on N pieces of temperature information, where N is a natural number of 2 or more, corresponding to the temperature of the pressure chamber detected by the temperature detection unit at different timings.

A printing apparatus is provided that includes a print head having a nozzle array including a plurality of nozzles arranged in a first direction, and is configured to print an image on a print medium by ejecting ink while moving the print head in a second direction intersecting the first direction. The apparatus further includes a control unit for controlling the number of nozzles used for printing on the basis of a limit value of electric power that can be supplied from a power supply to the print head. The control unit can execute first control in which printing is performed using all of the nozzles of the nozzle array and second control in which printing is performed using some of the nozzles of the nozzle array. Under the second control, the control unit performs printing on an area obtained by reducing an area printable under the first control.