A liquid-droplet ejecting apparatus includes: N nozzles; N driving elements; M power supply circuits that create a driving signal to be selectively supplied to the N driving elements; and N selecting circuits that selectively connect one of the M power supply circuits to a corresponding one of the N driving elements. The N driving elements are connected to the M power supply circuits in a first combination until a particular condition is satisfied. The first combination is a combination between the M power supply circuits and an M driving element groups, into which the N driving elements are divided based on a voltage of the supplied driving signal. The N driving elements are connected to the M power supply circuits in a second combination after the particular condition is satisfied. The second combination is another combination between the M driving element groups and the M power supply circuits.

A substrate processing method includes determining a first impact of an ink droplet ejected toward a substrate moving at a first speed, determining a second impact of an ink droplet ejected toward the substrate moving at a second speed, determining a reference ejection speed based on the first impact and the second impact, determining a plurality of third impacts of a plurality of ink droplets respectively ejected from a plurality of nozzles toward the substrate moving at a third speed, determining an ink ejection speed of each of the plurality of nozzles based on the first impact and the plurality of third impacts, and comparing the ink ejection speeds of the plurality of nozzles with the reference ejection speed and determining whether ink ejection performance of the plurality of nozzles is abnormal.

There is provided an ink-jet printer including: a recording head; a power supply; and a controller. In a case that the controller obtains a maintenance instruction, the controller performs: boosting driving voltage to a target voltage value, in accordance with a first pattern; and applying the driving voltage to at least one of driving elements. In a case that the controller obtains an image recording instruction, the controller performs: boosting the driving voltage to the target voltage value, in accordance with a second pattern having a voltage boosting time shorter than the first pattern; and recording an image on a sheet by selectively applying the driving voltage, boosted to the target voltage value, to the driving elements.

A liquid jetting apparatus includes: a first head chip having first nozzles arranged in a nozzle arrangement direction; a second head chip having second nozzles arranged in the nozzle arrangement direction, and being arranged to overlap at least partially with the first head chip in an orthogonal direction orthogonal to the nozzle arrangement direction; a controller configured to control the first head chip and the second head chip to jet liquid from the first nozzles and the second nozzles; and power sources having different voltages, respectively. Each of the first nozzles and the second nozzles is driven by voltage supplied from one of the power sources, and the first head chip has a first overlapping portion and the second head chip has a second overlapping portion overlapping with the first overlapping portion in the orthogonal direction.

A power supply apparatus capable of switching an output voltage Vout based on an external control signal includes a control unit configured to perform control to stop an output from the power supply apparatus in a case where a voltage applied to a Vcc terminal is higher than a predetermined voltage Vovp. The Vcc terminal is connected to a primary-side auxiliary winding of a transformer via a regulator and the control unit operates based on power supplied to the Vcc terminal in normal operation. A base of an NPN transistor included in the regulator is connected to a ground via a first resistance R1 and a first zener diode ZD1. A second resistance R2 is provided between the base and a collector of the NPN transistor.

A liquid jetting apparatus includes: a head including nozzles and driving elements arranged to correspond to the nozzles; a power source connected to the driving elements; and a control circuit connected to the power source. The control circuit determines whether an output voltage value of the power source is changed from a first voltage value to a second voltage value. When the control circuit has determined that the output voltage value is changed from the first voltage value to the second voltage value, the control circuit calculates an absolute value of a difference between the first voltage value and the second voltage value and compares the absolute value of the difference and a threshold value. When the absolute value of the difference is equal to or more than the threshold value, the control circuit determines a calculation voltage value smaller than the absolute value of the difference.

A head unit control circuit controls a head unit. The head unit includes an ejector, a determination circuit, and an ejection limit circuit. The ejector includes a displaceable piezoelectric element for controlling the liquid ejection. The piezoelectric element is displaced by changing a drive signal potential. The determination circuit determines whether the piezoelectric element has a predetermined electrical storage capability. The ejection limit circuit stops the drive signal to limit the ejection of the liquid based on the determination. The head unit control circuit includes: a first terminal that outputs an instruction signal instructing the head unit to execute the determination; a second terminal that outputs the drive signal; and a third terminal that is between the first terminal and the second terminal. The third terminal has a smaller potential change width than the second terminal when the ejecting section ejects the liquid.

In a print element substrate: if an amount of a voltage drop when the number of print elements driven simultaneously in a state in which the predetermined voltage is applied with respect to one print element array is largest is set as an amount of a voltage drop of the print element array, and a sum of amounts of voltage drops of the print element arrays assigned to one group is set as an amount of a voltage drop of the group, a difference between a largest value and a smallest value of the amounts of the voltage drops of the M groups is smaller than a largest value of the amounts of the voltage drops of the N print element arrays.

A liquid discharging apparatus capable of performing printing on a medium having a short-side width of A3 or greater, the apparatus including a head unit which includes an exchangeable print head including a discharge unit that discharges a liquid through driving of a drive element, a detection circuit which detects that exchanging of the print head is possible, and a wiring substrate which is provided with a connector and is electrically connected to the print head via the connector, a drive circuit which outputs a drive signal for driving the drive element, and a cable which is connected to the wiring substrate and transfers the drive signal to the print head.

An intermediate transfer body is efficiently heated, and thus, transfer properties of an image and durability of the intermediate transfer body are ensured. A heating unit heats the intermediate transfer body by using a plurality of heating sources which are positioned by being shifted in a rotation direction of the intermediate transfer body. The plurality of heating sources includes a first heating source and a second heating source, a degree of heating the intermediate transfer body by the second heating source being higher than a degree of heating the intermediate transfer body by the first heating source. The second heating source is positioned on an upstream side in the rotation direction from the first heating source.