Abstract: A printer including a first liquid discharger, a second liquid discharger, a curing unit, and a controller is provided. The first and second liquid dischargers discharge active-energy-ray-curable colored and transparent liquids, respectively. The curing unit emits an active energy ray. The controller causes the first liquid discharger to scan multiple times and discharge the colored liquid on a medium, causes the curing unit to cure the colored liquid on the medium after each scan of the first liquid discharger to print a colored image with the colored liquid on the medium, causes the second liquid discharger to discharge the transparent liquid on the colored image, causes the curing unit to cure the transparent liquid on the colored image to form a transparent layer on the colored image, and controls a thickness of the transparent layer in accordance with the number of scan of the first liquid discharger.

Abstract: Provided is a printing apparatus that includes a support unit which has a support surface for supporting a medium and moves in a movement direction, and a print unit configured to perform printing on the medium supported by the support unit. The support surface includes a first side and a second side that is shorter in length than the first side and extends in a direction intersecting with the first side. The support unit can be displaced to be in a first state where the first side is so arranged as to be along the movement direction and in a second state where the first side is so arranged as to be along a direction intersecting with the movement direction.

Abstract: A liquid discharge head includes a nozzle, an individual liquid chamber, a common liquid chamber, a fluid restrictor, a circulation channel, a circulation fluid restrictor, and a plurality of laminated plate members. The nozzle discharges liquid. The individual liquid chamber is communicated with the nozzle. The common liquid chamber supplies the liquid to the individual liquid chamber. The fluid restrictor is disposed between the individual liquid chamber and the common liquid chamber. The circulation channel is communicated with the individual liquid chamber. The circulation fluid restrictor is disposed between the individual liquid chamber and the circulation channel. The plurality of laminated plate members constitutes the fluid restrictor, the individual liquid chamber, and the circulation fluid restrictor. A single plate member of the plurality of laminated plate members defines a fluid resistance value of the fluid restrictor and a fluid resistance value of the circulation fluid restrictor.

Abstract: An inkjet printing apparatus includes a transport speed detector for detecting transport speed of a printing medium, an inkjet head having a plurality of discharge portions for discharging ink droplets from the discharge portions for printing, and a flushing controller for carrying out discrete flushing from the discharge portions. For an acceleration area of the printing medium where the transport speed detector detects an increase in transport speed before printing, a first discharge rate is set as discharge rate of the ink droplets per unit time for the discharge flushing. For a constant speed area of the printing medium where the transport speed detector detects a substantially constant transport speed during printing, a second discharge rate lower than the first discharge rate is set as discharge rate of the ink droplets per unit time for the discharge flushing.

Abstract: A method of printing includes identifying vertical edges in a halftone image. The method also includes determining whether a lightness of color of a first predetermined area to a left side of a respective vertical edge is substantially equal to, less than, or greater than the lightness of color of a second predetermined area to a right side of the respective vertical edge. The method also includes categorizing respective vertical edges left vertical edges, right vertical edges, and neutral vertical edges to prioritize a print direction thereof.

Abstract: A drive circuit includes an amplification unit that amplifies a signal and outputs the amplified signal toward a node; and a voltage output unit that outputs a voltage responding to the signal toward the node during a predetermined period of a part or all of a period in which a magnitude of a voltage change of the signal is less than or equal to a threshold. The amplification unit includes a differential amplifier, a selector, and transistors, and the voltage output unit includes a linear amplifier and a switch.

Abstract: An ink-jet printer includes a conveyor, a recording head, a power supply, an ink receiver, a command receiver, and a controller. The controller executes: determining an ink amount to be discharged; determining a voltage value of a drive voltage and the number of ink droplets; raising the drive voltage; executing a flushing process, executing a printing process. The controller determines the voltage value such that the drive voltage becomes higher when the determined ink amount is not less than a first threshold value than when the determined ink amount is less than the first threshold value, and determines the number of ink droplets such that the number of ink droplets becomes larger when the determined ink amount is not less than a second threshold value than when the determined ink amount is less than the second threshold value.

Abstract: A printing apparatus includes a reaction liquid application portion that applies dots of reaction liquid onto a recording medium by applying the reaction liquid to pixels in a pixel array in which rasters in which a plurality of pixels are lined up in a first direction are lined up in a second direction which is orthogonal to the first direction and an ink application portion that applies ink dots to the recording medium by applying ink which includes a color material that is coagulated using an action of the reaction liquid to the pixels of the pixel array, in which the reaction liquid application portion applies the reaction liquid dots by being separated by one pixel or more in the first direction and the second direction.

Abstract: A liquid ejection head includes a first ejection opening group in which a plurality of ejection openings that eject a particular kind of liquid onto a print medium are arranged in a predetermined direction, and a second ejection opening group that is provided along the first ejection opening group to eject the particular kind of liquid onto the print medium. The first ejection opening group is provided upstream of the second ejection opening group with respect to a relative moving direction between the print head and the liquid ejection head. The plurality of ejection openings included in the first ejection opening group are disposed in the predetermined direction in a zigzag shape, and the liquid ejected from the ejection openings adjacent to each other in the predetermined direction come in contact with each other on the print medium.

Abstract: A printer control section arranged to control a printhead, is operable to cause the printhead to: perform a plurality of passes over a swath of a print medium, the plurality of passes including first and second treatment passes; apply treatment to the print medium in each of the treatment passes, the treatment in each treatment pass being applied according to a respective treatment mask, wherein each treatment mask indicates a corresponding set of pixels to which the treatment may be applied in a pass to which the treatment mask is applied, the treatment mask having a weight indicative of the proportion of pixels in the corresponding set of pixels, and the treatment masks of the first and second passes are such that a weight of the first treatment mask is different from a weight of the second treatment mask.

Abstract: A liquid ejecting apparatus includes a liquid ejecting head that is provided with a plurality of nozzle openings that discharge a liquid, and pressure generation units that generate pressure changes in pressure generation chambers that are respectively in communication with the nozzle openings, a detection unit that detects a discharge fault of liquid droplets of the liquid ejecting head for each of the nozzle openings, and a control unit that controls the pressure generation units, in which the control unit has a discharge prohibition mode in which the driving of a pressure generation unit that corresponds to a nozzle opening in which a discharge fault is detected, is prohibited after the corresponding discharge fault is detected while recording is underway.

Abstract: Addressing an EPROM on a printhead is described. In an example, a printhead includes an electronically programmable read-only memory (EPROM) having a plurality of cells arranged in rows and columns, each of the cells having a addressing port, a row select port, and a column select port. A conductor is coupled to the addressing portion of each of the plurality of cells. A column shift register is coupled to the column select ports of the plurality of cells, the column shift register having a register location for each column of the plurality of cells and having an input to receive a first input signal. A row shift register is coupled to row select ports of the plurality of cells, the row shift register having a register location for each row of the plurality of cells and having an input to receive a second input signal.

Abstract: A method of slicing and printing multi-color 3D object is provided. The method includes following steps of: loading a coordinate information and a color information of a multi-color 3D object; executing a slicing process to generate a plurality of object printing slices and a plurality of object images; generating a plurality of pollution-blocking printing slices and making each pollution-blocking printing slice partially overlap an edge of the same-layer object printing slice; controlling a modeling nozzle of a multi-color 3D printer to print the object printing slices layer by layer, printing each pollution-blocking printing slice partially overlapping the same-layer object printing slice after the same-layer object printing slice is printed, and controlling a coloring nozzle of the multi-color 3D printer to color each of printed object printing slice after the same-layer pollution-blocking printing slice is printed.

Abstract: A driving device for a liquid ejection head is configured to drive a plurality of piezoelectric elements of a liquid ejection head, the liquid ejection head including a plurality of ejection orifices configured to eject liquid and the plurality of piezoelectric elements configured to generate energy for ejecting liquid from the plurality of ejection orifices. The driving device includes a control circuit unit including storage sections and transfer circuits, and a drive circuit unit including a plurality of individual drive circuit sections. The control circuit unit is an integrated circuit which is different from the drive circuit unit.

Abstract: An inkjet printing machine includes: a paper feeder; a transfer unit having a conveyer belt with a plurality of suction holes formed thereon and transferring a sheet fed by the paper feeder while sucking and holding the sheet on the conveyer belt by suction force generated at the suction holes; inkjet heads discharging ink on the transferred sheet; and a controller performing printing by controlling the above components, wherein the suction holes of the conveyer belt are arranged so that, when the leading edge of the sheet in the transfer direction does not overlap with the suction holes, the trailing edge of the sheet also does not overlap with the suction holes, and the controller controls the paper feeder to feed a sheet at a timing when the leading edge and the trailing edge of the sheet in the transfer direction do not overlap with the suction holes.

Abstract: Operations of printing systems are disclosed. According to examples, a deposition sequence for depositing printing fluids onto a substrate location is dynamically controlled. Sub-groups of nozzles in nozzle arrays are selected according to the deposition sequence.

Abstract: A driving pulse to be applied is changed when an overlapped level of invert timing of driving pulse is large.

Abstract: In order to remove from a substrate having a concavo-convex pattern formed on a surface of the substrate, a solid material with which a concave portion of the concavo-convex pattern is filled and which is formed by evaporating a solvent in a sublimable substance solution containing a sublimable substance that sublimates at a temperature equal to or higher than a first temperature, and an impurity that evaporates at a temperature equal to or higher than a second temperature that is higher than the first temperature, the prevent invention provides a substrate processing apparatus and a substrate processing method which heat the substrate to a temperature equal to or higher than the second temperature.

Abstract: A computer-implemented system for determining ink availability in one or more ink reservoirs in a print system is described. The system includes at least one ink reservoir for each color ink used in the printing system, a print unit associated with each ink reservoir configured to apply a print image including at least one color of ink to a substrate based on print image information, and an ink level monitoring system configured to determine an ink availability in each ink reservoir based on printed image count information including a number of printings of the print image and a total wet ink utilization generated based on a characterization of a print condition and further based on a measured dry ink utilization per area of coverage using the print image information and corrected by an ink usage correction multiplier.

Abstract: A liquid jetting apparatus includes: a head unit including a liquid jetting surface with nozzles; a cap movable between a capping position and an uncapping position; a cap movement device allowing the cap to reciprocate; a driven device; a drive motor driving the cap movement device and the driven device; a first gear transmitting power from the drive motor to the cap movement device; a second gear transmitting the power from the drive motor to the driven device; a switch gear which is moved by the power from the drive motor between a position in which the switch gear engages with the first gear and a position in which the switch gear engages with the second gear; a gear movement device moving the switch gear; a sensor outputting a signal according to driving of the cap movement device; and a controller.

Abstract: An inkjet printhead device, fluid ejection device and method thereof are disclosed. The fluid ejection device includes a fluid supply chamber to store fluid, an ejection chamber including a nozzle and a corresponding ejection member to selectively eject the fluid through the nozzle, and a channel to establish fluid communication between the fluid supply chamber and the ejection chamber. The fluid ejection device also includes a pressure sensor unit having a sensor plate to output a voltage value corresponding to a cross-sectional area of an amount of fluid in the at least ejection chamber.

Abstract: An inkjet printing method is provided. A smear-free printed matter superior in glossiness can be obtained. The inkjet printing method includes: a second ink layer forming step of discharging a second ink on a first ink layer formed on a recording medium and drying the discharged second ink, and a third ink layer forming step of discharging a third ink on the second ink layer and drying the discharged third ink. A drying time during the second ink layer forming step is shorter than a drying time during the third ink layer forming step.

Abstract: A liquid ejecting apparatus includes an ejection unit group that is configured with a plurality of ejection units which receives a drive signal and ejects liquid; an ejection state inspection unit that inspects a state of the ejection units; and an inspection ejection unit designation data management unit that manages inspection ejection unit designation data designating the ejection unit which is an inspection target that is the ejection unit which is inspected by the ejection state inspection unit, in the ejection unit group. The inspection ejection unit designation data includes first data of a first data format that designates the ejection unit which is first inspected, and second data of a second data format that designates the ejection unit which is continuously inspected. The second data has a smaller size than the first data.

Abstract: A fluid printhead including a plurality of heater elements that are driven to nucleate bubbles in fluid so that the fluid is ejected from the printhead in the form of drops, a plurality of drive elements, each drive element selectively driving a corresponding one of the plurality of heater elements in accordance with a printer controller, and a drop detection system that includes a plurality of drop detection cells, each drop detection cell detecting a change in electrical resistance of a corresponding one of the plurality of heater elements that occurs upon drop formation.

Abstract: A nozzle arrangement of a head portion of a printer includes nozzle arrays arranged in a first direction. Each of the nozzle arrays has nozzles arranged in a second direction crossing the first direction. Each of the nozzles is provided to eject liquid. The printer includes a set of liquid passages provided to supply the liquid to the nozzle arrangement. The set of liquid passages has liquid passages interconnected via a communication path. The nozzles in each of the nozzle arrays is connected to a corresponding one of the liquid passages. In selective flushing that is performed a plurality of times, among the nozzles configuring the nozzle arrays, liquid is ejected from the nozzles arranged in a first region adjacent to the communication path.

Abstract: A test structure and method to detect open circuits due to electromigration or burn-out in test wires and inter-level vias. Electromigration occurs when current flows through circuit wires leading to a circuit interruption within the wire. The test structure is a passive test wire arranged in one of several configurations within the circuit of a computer chip. The dimensions and resistances of test wires can vary according to the test structure configuration. Each test wire is measured for an electrical discontinuity after the computer chip is powered-on. If a wiring interruption is detected, it is concluded that the chip had been powered-on before.

Abstract: The disclosure discloses a printer comprising a first control portion configured to control a feeder and a conducting device to perform printing on a recording medium. The first control portion executing a first processing, a second processing, and a third processing. In the first processing, printing on the recording medium is performed while feeding the recording medium to a forward direction, based on first print data. In the second processing, printing on a first predetermined section is performed while continuously feeding the recording medium to the forward direction, based on second print data, triggered by receipt of a print stop instruction in the middle of the first processing. In the third processing, feeding the recording medium to a reverse direction is performed and, with current conduction to the heating elements stopped, making the heating elements face the first predetermined section for a first predetermined amount of time.

Abstract: A first mask region is a dot recording region including a pixel position on which a dot is recorded, a second mask region is a dot non-recording region including only a pixel position on which a dot is not recorded, recording of dots is performed so as to overlap the first mask regions with each other in a state where the first mask regions of two masks or more among the P masks are shifted from each other on the recording medium, and D1<D3<D2 is satisfied, when a dot charge rate which is a ratio of dots that are recorded in one pass of the entirety of the dots in a first region A1 on an inner side of boundary lines that form an outer edge of the first mask region in the first mask regions is D1.

Abstract: A method for detecting a demountable accessory in an image-forming device is disclosed. The image-forming device comprises a controller, a print platen suitable for receiving a substrate, and a handling mechanism. The print platen has an optical sensor associated therewith adapted to capture an image of an item on the print platen. A first image is captured. The handling mechanism carries out an adjustment action suitable for adjusting the position of the substrate on the print platen. A second image is captured. The first and second images are analyzed to identify any changes and of the captured images is analyzed to detect an accessory identifier. The presence of an item on the platen is determined from the analysis.

Abstract: A discharger is configured to discharge liquid in a liquid channel to outside the liquid channel. The liquid is at least one of first liquid and second liquid different from the first liquid. An agitator is configured to agitate the liquid in the liquid channel. When executed by a processor, instructions cause the processor to perform: an introducing process of, when the second liquid exists in the liquid channel, controlling the discharger to discharge the second liquid to outside the liquid channel and to introduce the first liquid from the tank into the liquid channel; an agitating process of, after the introducing process, controlling the agitator to agitate the liquid in the liquid channel; and a discharging process of, after the agitating process, controlling the discharger to discharge the liquid in the liquid channel agitated by the agitator to outside the liquid channel.

Abstract: An actuator (1) comprising: an actuating element (2); a first mounting (3) and a second mounting (4), configured for allowing the actuating element (2) to be positioned on a reference plane (P); characterized in that: the first mounting (3) is operable to allow the actuating element (2) to move in a direction (X) substantially parallel to the reference plane (P) and to allow a portion of a first end of the actuating element (2) to rotate about a first axis of rotation (T) substantially perpendicular to (X), thereby minimising wear between the actuating element (2) and the first mounting (3) during actuation.

Abstract: An aqueous ink for ink jet including a resin particle. The resin particle includes a first layer and a second layer in this order from the inside to the outside thereof. The first layer is composed of a first resin, wherein the proportion of a unit derived from an aromatic-group-containing ethylenically unsaturated monomer in the first resin is 10% by mass or less. The second layer has a tetrahydrofuran-insoluble fraction of 10% by mass or more and is composed of a second resin having a unit derived from an aromatic-group-containing ethylenically unsaturated monomer and a unit derived from an ionic-group-containing ethylenically unsaturated monomer, wherein the proportion of the unit derived from the ionic-group-containing ethylenically unsaturated monomer in the second resin is 3% by mass or more to 70% by mass or less.

Abstract: A capacitive load driving circuit for repeating between charging and discharging for a capacitive load includes a charge supply source, a first signal path through which a first voltage is applied by the charge supply source, a second signal path through which a second voltage higher than the first voltage is applied by the charge supply source, and a connection path selector configured to electrically connect the capacitive load and the charge supply source via at least one of the first signal path and the second signal path, in accordance with a control signal. The charge supply source is arranged and configured to supply voltage to the connection path selection section.

Abstract: A controller is configured to: (a) control a head according to a recording command received to eject liquid through ejection openings toward a recording medium; (b) control a discharger to discharge the liquid toward a receiving member through at least one of the ejection openings; (c) determine whether a remaining amount representing an amount of the liquid on the receiving member and based at least on an amount of the liquid discharged onto the receiving member in the step (b) is equal to or greater than a first predetermined amount; and (d) control the remover to remove the liquid on the receiving member. The controller is configured to perform the step (a) before the step (d) when it is determined in the step (c) that the remaining amount is less than the first predetermined amount.

Abstract: An image processing apparatus for processing image data to be used for image formation, comprises: a black background area determination unit configured to determine a black background area formed from a plurality of black lines using the number of consecutive black lines and the number of consecutive lines adjacent to the black lines and other than the black lines out of the image data; and a thinning processing unit configured to perform thinning processing for the black background area by switching a thinning pattern to convert a value of a pixel based on the number of lines included in the black background area determined by the black background area determination unit.

Abstract: Methods for ejecting fluids having a viscosity ranging from about 20 mPa-sec to about 100 mPa-sec at 22° C. from a micro-fluid ejection head. The methods include the steps of applying a heat signal to the ejection head for a first period of time to heat the ejection head to a first temperature that is about 20° C. above a steady state fluid ejection temperature for continuous or intermittent fluid ejection from the ejection head; and subsequently, applying a firing signal to ejection heaters on the ejection head during which fluid ejection from the ejection head occurs.

Abstract: An element substrate capable of suppressing occurrence of electromagnetic noise upon driving printing elements on an element substrate with long wiring lengths, preventing an operation error, and printing a high-quality image is provided. In the element substrate, plural element substrates each including printing elements are arrayed in an arrayed direction of the printing elements. Each element substrate including a wiring for supplying a driving power to drive the printing elements, and a ground wiring from the printing elements is configured as follows. Each element substrate includes a delay circuit for delaying a heat enable signal to drive the printing elements and supplying it to each printing element, and a switchover circuit for switching over, in accordance with a control signal, a delay sequence when supplying the heat enable signal to each printing element.

Abstract: Methods and systems are provided for color printing onto nonwhite substrates and articles. For example, a method of color printing is provided, including printing multiple layers of ink each including a combination of a white ink and at least one color ink, and each printed layer having a ratio of white ink to color ink, wherein the ratio may be the same or may vary as a function of the number of layers and the color printed.

Abstract: A printing apparatus includes: a liquid ejecting module having a plurality of liquid ejecting heads; a driving substrate mounted with a driving circuit that generates a driving signal; a control unit that generates an ejection control signal; and a relay substrate. The driving signal is transferred from the driving substrate to the relay substrate via a first wire, and the driving signal is transferred from the relay substrate to the liquid ejecting module via a second wire. The ejection control signal is transferred from the control unit to the liquid ejecting module via a third wire.

Abstract: An automated assay-fluid dispensing system includes a database that associates assay protocols with assay procedures, the procedures including a first assay procedure specifying dissimilar first and second channel procedures for driving first and second channels of a fluid-dispenser cassette. The system includes a controller with a procedure selector to select or to assist a human to select an assay procedure from the database to be executed in an assay run. The controller also includes a cassette driver to drive the cassette to dispense fluids automatically to multiple sites during the assay run so that fluids in the first and second channels are dispensed in accordance with the dissimilar first and second channel procedures. The system includes a cassette interface to engage the cassette so that the controller can drive it to implement the assay run.

Abstract: A printing apparatus comprising a printhead including two nozzle arrays neighboring in a first direction, each array including nozzles arrayed in a second direction, a determining unit for determining discharge nozzles and non-discharge nozzles for each array, a conveying unit for conveying a sheet to the first direction, a unit configured to perform (a) determining printing data such that dots corresponding to the non-discharge nozzles in one array are printed by the discharge nozzles in another array, (b) inserting null data into the printing data based on a shift amount of between printing positions of the two nozzle array, and (c) newly determining discharge nozzles and non-discharge nozzles by the determining unit based on the printing data including the null data.

Abstract: A device for printing on at least one region of a surface of a so-called 3D object, for instance a curved auto body part, includes a manipulator, for instance an articulated-arm robot with six degrees of freedom. The device also includes a system for vibration compensation for the print head. The system includes an active component and a passive component. Manipulator vibration which creates defects in a printed image may thus be effectively avoided.

Abstract: There is provided a liquid discharging apparatus configured to discharge liquid, including: a liquid discharging head including a driving element; a driving device configured to drive the driving element; a power unit; a switch configured to perform switching of voltage supply; and a controller. When the power unit is switched on, the controller causes a power supply voltage of the power unit to be raised up to a first voltage while checking the power supply voltage; and the controller controls the switch to start the voltage supply from the power unit to the driving device while the power supply voltage is being raised up to the first voltage; and under a condition that the voltage supply is started while the power supply voltage is being raised up to the first voltage, the controller controls the driving device to apply the voltage to the driving element.

Abstract: An image forming apparatus includes a carriage configured to scan with an ejection head for ejecting ink droplets that harden when exposed to active energy line onto a recording medium to form an image and an emitter unit for emitting the active energy line mounted thereon, and an image forming controller configured to control ejection of the ink droplets from the ejection head and scan of the carriage. The image forming controller forms an ink droplet film of an uppermost layer of an image made of multiple layers of ink droplet films with finer image quality than that of an ink droplet film of each lower layer other than the uppermost layer, and forms the ink droplet film of the each lower layer other than the uppermost layer with coarser image quality and in a shorter length of time than a length of time taken to form the uppermost layer.

Abstract: A device for printing on a surface of an object contains a stationary printing unit for printing on the object. The printing unit contains an inkjet print head for creating a print on the surface of the object in an operating area of the print head. A movable holding unit is provided for receiving the object in a receiving region and for a rotary movement of the object from the receiving region into the operating area of the print head and for a linear movement of the object in the operating area of the print head during the creation of the print. At least one control unit is provided for controlling the movements of the holding unit and the creation of the print.

Abstract: A fluid ejection device including, at least, one recirculation system is disclosed. Such recirculation system contains, at least, one drop generator, recirculation channels that include an inlet channel, an outlet channel and a connection channel and a fluid feedhole that communicates with the drop generator via the inlet channel and the outlet channel of the recirculation channel. The recirculation channels can be asymmetrical with reference to the drop generator.

Abstract: An information processing apparatus includes a display section, a touch panel, an acceptance section, a communication section, and a communication control section. The display section is capable of displaying a first operating image in which a plurality of first operating keys are arranged. The communication section is capable of communicating with a mobile terminal device capable of displaying a second operating image in which one or more second operating keys operable in combination with the first operating keys are arranged. The communication control section allows the communication section to receive from the mobile terminal device operating information indicating that one of the second operating keys has been selected.

Abstract: An image recording apparatus includes: an ink-jet head including an energy applier that causes ejection of ink; a medium supplier that supplies a recording medium; a first sensor provided on a supply path through which the recording medium is to be supplied to the ink-jet head by the medium supplier; and a controller. The controller controls the energy applier to perform first preparatory driving including flushing before the ink-jet head performs image recording. The controller controls the energy applier to perform second preparatory driving including the flushing or ink agitation driving after the first preparatory driving and detection of the recording medium by the first sensor. The controller controls the energy applier to perform the second preparatory driving in accordance with an elapsed time extending from an input of a recording command to the detection of the recording medium by the first sensor.

Abstract: The ink set of the invention includes a first ink composition and a second ink composition. The first ink composition contains a first pigment and an alkanediol having 6 or less carbon atoms and having a normal boiling point of 245° C. or more. The content of the first pigment is 1.5% by mass or more, and the content of the alkanediol is 3% by mass or more and 20% by mass or less. The second ink composition contains a second pigment and a penetrant other than the alkanediol. The content of the second pigment is less than 1.5% by mass. The penetrant contained in the second ink composition has an osmotic force higher than that of the alkanediol contained in the first ink composition.

Abstract: Provided are an ink jet recording apparatus and an abnormality detection method of an ejector which are capable of performing high-accuracy abnormality detection and suppressing the generation of excessive abnormality detection with respect to a required image quality. An ink jet recording apparatus (10) includes an ink jet head (20C, 20M, 20Y, 20K) having a plurality of ejectors, a medium transport unit (22), a calculation unit (34) that calculates an index value relevant to a droplet ejection amount for each ejector on the basis of printing data, a threshold determination unit (40) that determines a threshold for ejection abnormality determination for each ejector in accordance with the index value, a threshold storage unit (44) that stores the threshold determined for each ejector, and an abnormality determination unit (54) that determines the presence or absence of ejection abnormality by comparing the threshold with a measurement amount for each ejector.