Abstract: According to an embodiment, an inkjet head includes a nozzle that ejects ink, an ink pressure chamber that connects to the nozzle, an actuator that changes a volume of the ink pressure chamber, and an actuator driving circuit that drives the actuator with a driving waveform. The driving waveform includes an ejection pulse portion that changes from a first voltage to a second voltage at which the ink pressure chamber expands and then changes from the second voltage to a third voltage at which the ink pressure chamber contracts so as to eject the ink from the nozzle. The third voltage is between that of the first and second voltages in potential level. The potential difference between the second and third voltages is greater than the potential difference between the third and first voltages.

Abstract: According to one embodiment, an ink jet head includes a piezoelectric member to drive a pressure chamber, an electrode pair to apply a voltage to the piezoelectric member, and a common waveform generation circuit to generate a common waveform. The common waveform alternately includes an element of a first output waveform and an element of a second output waveform at a predetermined period. A switch is connected between a first electrode of the electrode pair and the common waveform generation circuit. A timing controller supplies a control signal to turn the switch on and off at the predetermined period such that the first or second output waveform can be selectively applied to the piezoelectric member to drive the pressure chamber to eject a liquid.

Abstract: A droplet dispensing apparatus includes a crystal sensor, a resonance frequency measuring unit, and a controller. The controller is configured to obtain the resonance frequency of the crystal sensor before droplets are discharged from a liquid dropping device, control the liquid dropping device to discharge droplets on to the crystal sensor, and obtain the resonance frequency of the crystal sensor after droplets are discharged from the liquid dropping device. The controller estimates a volatilization amount for the droplets on the crystal sensor based on a temporal change trend in the resonance frequency of the crystal sensor and calculates the total weight of the droplets discharged from the liquid dropping device based on the difference in resonance frequency of the crystal sensor before and after the droplets are discharged and the estimated volatilization amount.

Abstract: According to an embodiment, a liquid ejection head includes a plurality of drive flow paths, a plurality of dummy flow paths, and a plurality of side walls. The drive flow paths connect to liquid ejection nozzles. The dummy flow paths connect to dummy nozzles. The dummy flow paths are adjacent the drive flow paths. The side walls are between the drive flow paths and the dummy flow paths and configured to change volumes of both the drive flow paths and the dummy flow paths in response to drive signals. An acoustic resonance period of liquid in the dummy flow paths is shorter than an acoustic resonance period of the liquid in the drive flow paths.

Abstract: A liquid ejection device includes a liquid supply unit, an array of nozzles arranged in a matrix and through which liquid is ejected, actuators each connected to one of the nozzles, and a circuit configured to output signals to the actuators according to delay times that are predetermined in a matrix corresponding to the matrix of the array. The delay times include (k+l?1) or more different delay times where the matrix thereof has k columns and l rows. The matrix is defined such that a difference of two adjacent delay times in each of column and row directions is an odd multiple of a half cycle of a natural vibration period of the liquid, and between two adjacent columns and rows, two or more different delay time differences exist between each pair of corresponding delay times of the adjacent columns and rows, respectively.

Abstract: An inkjet head includes a pressure chamber storing ink, a nozzle communicating with the chamber, an actuator ejecting the ink through the nozzle by changing a volume of the chamber, and a circuit outputting a drive signal to the actuator with a drive waveform having a cycle based on a number of gradation levels being used for printing. When printing is performed using three or more gradation levels, the circuit outputs the signal that has a multi-drop drive waveform including two or more first waveforms for ejecting first to (n?1)-th droplets of the ink where n is equal to or greater than 3, a second waveform for ejecting an n-th droplet of the ink, and an intermediate time between the first waveform for ejecting the (n?1)-th droplet and the second waveform for ejecting the n-th droplet. The intermediate time is longer than a time between two adjacent first waveforms.

Abstract: According to one embodiment, a liquid ejection head includes a pressure chamber that contains a liquid, an actuator to change the pressure in the pressure chamber according to an applied drive signal, and a drive circuit to apply a first drive signal to the actuator when a single droplet is to be ejected from the pressure chamber and a second drive signal to the actuator when two or more droplets are to be ejected in series from the pressure chamber. The first drive signal has a first auxiliary pulse before a first ejection pulse. The second drive signal has a second auxiliary pulse before the first ejection pulse. A pulse width of the first auxiliary pulse is greater than a pulse width of the second auxiliary pulse.

Abstract: According to an embodiment, an inkjet head includes a nozzle that ejects ink, an ink pressure chamber that connects to the nozzle, an actuator that changes a volume of the ink pressure chamber, and an actuator driving circuit that drives the actuator with a driving waveform. The driving waveform includes an ejection pulse portion that changes from a first voltage to a second voltage at which the ink pressure chamber expands and then changes from the second voltage to a third voltage at which the ink pressure chamber contracts so as to eject the ink from the nozzle. The third voltage is between that of the first and second voltages in potential level. The potential difference between the second and third voltages is greater than the potential difference between the third and first voltages.

Abstract: A liquid discharge apparatus includes a nozzle plate with nozzles and actuators and a drive controller. First and second nozzles are directly adjacent to each other in a first direction. First and third nozzles are directly adjacent to each other in a second direction. The drive controller is configured to apply a drive signal to first, second, and third actuators corresponding to the first, second, and third nozzles, respectively, during a drive cycle. A difference between a first timing at which the drive signal is applied to the first actuator and a second timing at which the drive signal is applied to the second actuator and a difference between the first timing and a third timing at which the drive signal is applied to the third actuator is an odd number multiple of a half of an inherent vibration cycle of the liquid discharge apparatus.

Abstract: A liquid discharging device to be used with a liquid dispensing apparatus includes a discharging portion configured to discharge a liquid based on a control signal from the liquid dispensing apparatus on which the liquid discharging device is mounted, and a sheet material having a characteristic configured to be changed by the liquid dispensing apparatus after a discharge of the liquid by the discharging portion.

Abstract: According to an embodiment, a liquid ejection head includes a plurality of drive flow paths, a plurality of dummy flow paths, and a plurality of side walls. The drive flow paths connect to liquid ejection nozzles. The dummy flow paths connect to dummy nozzles. The dummy flow paths are adjacent the drive flow paths. The side walls are between the drive flow paths and the dummy flow paths and configured to change volumes of both the drive flow paths and the dummy flow paths in response to drive signals. An acoustic resonance period of liquid in the dummy flow paths is shorter than an acoustic resonance period of the liquid in the drive flow paths.

Abstract: According to one embodiment, an actuator of a liquid ejection head is supplied with a drive signal including a first waveform and at least one second waveform. First waveform includes a first change from a first voltage to a second voltage, and a second change from the second voltage to a third voltage less than the first voltage. A second waveform begins after a time equal to one half of the natural oscillation period of liquid in a pressure chamber of the liquid ejection head. The second waveform includes a change from the third voltage to the second voltage and a change from second voltage to the third voltage after a time less than one half of the natural oscillation period.

Abstract: A liquid discharge head includes a pressure chamber in which liquid can be stored, a diaphragm forming a bottom wall of the pressure chamber and having a nozzle opening through which liquid supplied from the pressure chamber is discharged in a first direction, and a drive element on a lower surface of the diaphragm and configured to change a volume of the pressure chamber. A protective film covers the drive element and having a first opening corresponding in position with the nozzle opening, and a liquid repellent film covers the protective film and the lower surface of the diaphragm within the first opening. The liquid repellent film has an opening aligned with the nozzle opening and has the same diameter as the nozzle opening. The liquid repellent film on the drive element is thinner than the liquid repellent film on the lower surface of the diaphragm within the first opening.

Abstract: An inkjet head includes a pressure chamber storing ink, a nozzle communicating with the chamber, an actuator ejecting the ink through the nozzle by changing a volume of the chamber, and a circuit outputting a drive signal to the actuator with a drive waveform having a cycle based on a number of gradation levels being used for printing. When printing is performed using three or more gradation levels, the circuit outputs the signal that has a multi-drop drive waveform including two or more first waveforms for ejecting first to (n?1)-th droplets of the ink where n is equal to or greater than 3, a second waveform for ejecting an n-th droplet of the ink, and an intermediate time between the first waveform for ejecting the (n?1)-th droplet and the second waveform for ejecting the n-th droplet. The intermediate time is longer than a time between two adjacent first waveforms.

Abstract: A liquid ejection device includes a liquid supply unit, an array of nozzles arranged in a matrix and through which liquid is ejected, actuators each connected to one of the nozzles, and a circuit configured to output signals to the actuators according to delay times that are predetermined in a matrix corresponding to the matrix of the array. The delay times include (k+l?1) or more different delay times where the matrix thereof has k columns and l rows. The matrix is defined such that a difference of two adjacent delay times in each of column and row directions is an odd multiple of a half cycle of a natural vibration period of the liquid, and between two adjacent columns and rows, two or more different delay time differences exist between each pair of corresponding delay times of the adjacent columns and rows, respectively.

Abstract: A liquid dispensing apparatus includes a mounting unit on which a liquid discharging device is mounted, a driving circuit to supply driving voltages to an actuator of the liquid discharging device mounted on the mounting unit, a capacitance measuring circuit configured to measure a capacitance value of the actuator and a controller configured to acquire the capacitance value, compare the capacitance value to a predetermined threshold value, and determine whether to supply a first control signal to the driving circuit to drive the actuator of the liquid discharging device to discharge a liquid based on the comparison of the capacitance value to the predetermined threshold value.

Abstract: According to one or more embodiments, a liquid discharge head comprises a substrate, a nozzle plate, and a damper member. The substrate comprises a plurality of pressure chambers. The nozzle plate is provided on a first surface of the substrate and comprises a plurality of nozzles, each of the plurality of nozzles aligned with a corresponding one of the plurality of pressure chambers. The damper member is provided on a second surface of the substrate and comprises a pressure wave absorbing material.

Abstract: According to one embodiment, a liquid dispensing apparatus includes a mounting unit configured to hold a liquid discharging apparatus that discharges liquid from nozzles simultaneously by an operation of an actuator. An inspection media placement region is provided on which an inspection medium can be placed to receive the liquid discharged from the liquid discharging apparatus. A controller is configured to control the actuator to vary a volume of the liquid discharged from each nozzle for a nozzle inspection operation. The volume is varied according to a predetermined distance between adjacent nozzles that simultaneously discharge liquid and a predetermined contact angle for a droplet of the liquid when on the inspection medium.

Abstract: According to one embodiment, a droplet dispensing apparatus include a droplet ejecting array having a plurality of nozzles from which solution can be ejected into a microplate on a baseplate, a sensor configured to detect a solution amount in the microplate, and a controller configured to detect that a nozzle in the plurality of nozzles is malfunctioning during a solution ejection process based on an initial solution amount in the microplate and a final solution amount in the microplate as detected by the sensor, and control a supplemental droplet dispensing operation in which an additional solution amount is ejected into the microplate based on the initial solution amount and the final solution amount in the microplate.

Abstract: A liquid discharge apparatus includes a nozzle plate with nozzles and actuators and a drive controller. First and second nozzles are directly adjacent to each other in a first direction. First and third nozzles are directly adjacent to each other in a second direction. The drive controller is configured to apply a drive signal to first, second, and third actuators corresponding to the first, second, and third nozzles, respectively, during a drive cycle. A difference between a first timing at which the drive signal is applied to the first actuator and a second timing at which the drive signal is applied to the second actuator and a difference between the first timing and a third timing at which the drive signal is applied to the third actuator is an odd number multiple of a half of an inherent vibration cycle of the liquid discharge apparatus.