Abstract: A liquid discharging apparatus includes a nozzle, a drive signal generation unit that generates a drive signal for driving a piezoelectric element, and a discharge abnormality detection unit that detects a change of an electromotive force of the piezoelectric element, which is caused by residual vibration in a cavity after the drive signal is supplied. The drive signal generation unit generates a first drive signal for checking whether or not a first discharge abnormality caused by a foreign substance adhering to a surface on which the nozzle opens occurs and a second drive signal for checking whether or not a second discharge abnormality caused by a cause other than the foreign substance occurs. A potential of the first drive signal when the discharge abnormality detection unit performs checking is different from a potential of the second drive signal when the discharge abnormality detection unit performs checking.

Abstract: A printer as an example of a liquid discharging apparatus includes a nozzle, a drive signal generation unit that generates a drive signal for driving a piezoelectric element, and a discharge abnormality detection unit that detects a change of an electromotive force of the piezoelectric element, which is caused by residual vibration in a cavity after the drive signal is supplied. The drive signal generation unit generates a first drive signal for checking whether or not a first discharge abnormality caused by a foreign substance adhering to a surface on which the nozzle opens occurs and a second drive signal for checking whether or not a second discharge abnormality caused by a cause other than the foreign substance occurs. The potential change for detecting the first drive signal is greater than the potential change for detecting the second drive signal.

Abstract: A liquid ejecting apparatus includes a generation unit that generates a driving signal, a discharge portion including a piezoelectric element that is driven by the driving signal, and a detection unit that detects residual vibration occurring in the discharge portion, in a detection period after a driving period during which the piezoelectric element is driven by the driving signal, in which the generation unit maintains a potential of the driving signal at a first potential in a first period, maintains the potential of the driving signal at a second potential in a second period, maintains the potential of the driving signal at a third potential in a third period, and maintains the potential of the driving signal at a detection potential in the detection period, the first potential is a potential between the second potential and the third potential, and the detection potential is a potential between the first potential and the second potential.

Abstract: A printer as an example of a liquid discharging apparatus includes a nozzle, a drive signal generation unit that generates a drive signal for driving a piezoelectric element, and a discharge abnormality detection unit that detects a change of an electromotive force of the piezoelectric element, which is caused by residual vibration in a cavity after the drive signal is supplied. The drive signal generation unit generates a first drive signal for checking whether or not a first discharge abnormality caused by a foreign substance adhering to a surface on which the nozzle opens occurs and a second drive signal for checking whether or not a second discharge abnormality caused by a cause other than the foreign substance occurs. The potential change for detecting the first drive signal is greater than the potential change for detecting the second drive signal.

Abstract: A printer as an example of a liquid discharging apparatus includes a nozzle, a drive signal generation unit that generates a drive signal for driving a piezoelectric element, and a discharge abnormality detection unit that detects a change of an electromotive force of the piezoelectric element, which is caused by residual vibration in a cavity after the drive signal is supplied. The drive signal generation unit generates a first drive signal for checking whether or not a first discharge abnormality caused by a foreign substance adhering to a surface on which the nozzle opens occurs and a second drive signal for checking whether or not a second discharge abnormality caused by a cause other than the foreign substance occurs. A potential of the first drive signal when the discharge abnormality detection unit (example of the residual vibration detection unit) performs checking is different from a potential of the second drive signal when the discharge abnormality detection unit performs checking.

Abstract: A liquid ejecting device includes: an ejector including: a piezoelectric element displacing corresponding to a drive signal potential; a pressure chamber changing volume corresponding to the piezoelectric element displacement; and a nozzle communicating with the pressure chamber, and ejecting liquid from the pressure chamber; and a detector detecting residual vibrations produced by the ejector after piezoelectric element displacement. The detector detects the residual vibrations in a third period when the drive signal having a drive waveform is supplied to the piezoelectric element. The drive waveform being set to a first potential in a first period, a second potential in a second period, and a third potential in the third period. The volume of the pressure chamber in the second period is smaller than the volume in the first period. The volume of the pressure chamber in the third period is larger than in the second period.

Abstract: A liquid ejecting device includes: an ejector including: a piezoelectric element displacing corresponding to a drive signal potential; a pressure chamber changing volume corresponding to the piezoelectric element displacement; and a nozzle communicating with the pressure chamber, and ejecting liquid from the pressure chamber; and a detector detecting residual vibrations produced by the ejector after piezoelectric element displacement. The detector detects the residual vibrations in a third period when the drive signal having a drive waveform is supplied to the piezoelectric element. The drive waveform being set to a first potential in a first period, a second potential in a second period, and a third potential in the third period. The volume of the pressure chamber in the second period is smaller than the volume in the first period. The volume of the pressure chamber in the third period is larger than in the second period.

Abstract: A liquid discharging apparatus includes a first discharge section that discharges a metallic ink, a second discharge section that discharges a pigment ink, a detection section that detects residual vibrations that occur in the first discharge section, and outputs a first detection signal, which shows a corresponding detection result, and detects residual vibrations that occur in the second discharge section, and outputs a second detection signal, which shows a corresponding detection result, and a determination section that executes a first determination, which determines whether or not the first detection signal satisfies first conditions, which should be satisfied in a case in which a discharge state of the first discharge section is normal, and executes a second determination, which determines whether or not the second detection signal satisfies second conditions, which should be satisfied in a case in which a discharge state of the second discharge section is normal.

Abstract: A liquid discharge apparatus includes a discharge unit including a piezoelectric element that is displaced in response to a drive signal, a pressure chamber of which an inner pressure is increased or decreased by the piezoelectric element, and a nozzle which is in communication with the pressure chamber and discharges liquid filling the pressure chamber, depending on an increase or a decrease in the inner pressure of the pressure chamber, a detection unit that detects residual vibration occurring in the discharge unit according to a potential change of the drive signal that is supplied to the piezoelectric element, and a determination unit that determines a discharge state, in which the detection unit outputs a first detection signal and a second detection signal, and the determination unit determines the discharge state, based on the first detection signal and the second detection signal.

Abstract: A liquid discharging apparatus includes a first discharge section that discharges a pigment ink, a second discharge section that discharges a dye ink, a detection section that detects residual vibrations that occur in the first discharge section and outputs a first detection signal, which shows a corresponding detection result, and detects residual vibrations that occur in the second discharge section and outputs a second detection signal, which shows a corresponding detection result, and a determination section that executes a first determination, which determines whether or not the first detection signal satisfies first conditions, which should be satisfied in a case in which a discharge state of the first discharge section is normal, and executes a second determination, which determines whether or not the second detection signal satisfies second conditions, which should be satisfied in a case in which a discharge state of the second discharge section is normal.

Abstract: A liquid discharging apparatus includes a first discharge section that discharges a metallic ink, a second discharge section that discharges a pigment ink, a detection section that detects residual vibrations that occur in the first discharge section, and outputs a first detection signal, which shows a corresponding detection result, and detects residual vibrations that occur in the second discharge section, and outputs a second detection signal, which shows a corresponding detection result, and a determination section that executes a first determination, which determines whether or not the first detection signal satisfies first conditions, which should be satisfied in a case in which a discharge state of the first discharge section is normal, and executes a second determination, which determines whether or not the second detection signal satisfies second conditions, which should be satisfied in a case in which a discharge state of the second discharge section is normal.

Abstract: A liquid discharging apparatus includes a first discharge section that discharges a pigment ink, a second discharge section that discharges a dye ink, a detection section that detects residual vibrations that occur in the first discharge section and outputs a first detection signal, which shows a corresponding detection result, and detects residual vibrations that occur in the second discharge section and outputs a second detection signal, which shows a corresponding detection result, and a determination section that executes a first determination, which determines whether or not the first detection signal satisfies first conditions, which should be satisfied in a case in which a discharge state of the first discharge section is normal, and executes a second determination, which determines whether or not the second detection signal satisfies second conditions, which should be satisfied in a case in which a discharge state of the second discharge section is normal.

Abstract: An ink jet printer is provided with a driving signal generating section which generates a driving signal for driving a piezoelectric element, a residual vibration detecting section, a control IC which includes the residual vibration detecting section, and a connection terminal which connects the piezoelectric element, an input terminal to which the driving signal is supplied and an output terminal from which an output signal of the residual vibration detecting section is supplied, a first external wiring which is connected to the input terminal and through which the driving signal is supplied, and a second external wiring which is connected to the output terminal and through which the output signal of the residual vibration detecting section is supplied. A resistance value per unit length of the second external wiring is larger than a resistance value per unit length of the first external wiring.

Abstract: A liquid discharge apparatus includes a discharge unit including a piezoelectric element that is displaced in response to a drive signal, a pressure chamber of which an inner pressure is increased or decreased by the piezoelectric element, and a nozzle which is in communication with the pressure chamber and discharges liquid filling the pressure chamber, depending on an increase or a decrease in the inner pressure of the pressure chamber, a detection unit that detects residual vibration occurring in the discharge unit according to a potential change of the drive signal that is supplied to the piezoelectric element, and a determination unit that determines a discharge state, in which the detection unit outputs a first detection signal and a second detection signal, and the determination unit determines the discharge state, based on the first detection signal and the second detection signal.

Abstract: An ink jet printer is provided with a piezoelectric element which is provided corresponding to a pressure chamber in order to discharge liquid droplets, a driving signal generating section which generates a driving signal, a residual vibration detecting section which detects changes in an electromotive force of the piezoelectric element in accordance with the residual vibration inside the pressure chamber which occur after the driving signal is applied, a first switch which switches whether or not a driving signal is applied to the piezoelectric element, and a second switch which switches whether or not a change in the electromotive force is supplied to a first high-pass filter, where the second switch and the residual vibration detecting section are connected via a first capacitor of the first high-pass filter.

Abstract: A liquid ejection device comprising a plurality of ejection parts for ejecting liquid in cavities, an inspection part for inspecting the ejection parts. The ejection parts are classified into a plurality of ranks according to a characteristic of each of the ejection parts.

Abstract: A liquid discharging apparatus includes: a recording head that includes M numbers of the discharging units; a drive unit that drives the discharging unit; a residual vibration detecting unit that detects residual vibration occurring in the discharging unit; and a determining unit that determines a state of discharge of the liquid in the discharging unit on the basis of a detection result. The determining unit is capable of performing the determination in two or more determination modes, and determines at least one of one or a plurality of target discharging units that is to be a target of the determination during a determination time period, and a drive discharging unit that the drive unit is to drive so as to determine the state of discharge of the liquid in the target discharging unit from the M numbers of discharging units depending on the determination mode.

Abstract: A liquid ejecting device including: an ejection unit that includes a piezoelectric element which is shifted according to a driving signal, and a nozzle that ejects a liquid which the shift of the piezoelectric element; a generating unit that generates the driving signal based on a designation signal; a supply unit that supplies the designation signal to the generating unit; a detecting unit that detects residual vibration generated in the ejection unit after the piezoelectric element is shifted according to the driving signal; and a determining unit that determines an ejection state of the liquid in the ejection unit based on the detection results of the detecting unit, in which the detecting unit detects the residual vibration during a detection period, and the supply unit supplies the designation signal to the generating unit during a period other than the detection period.

Abstract: A liquid discharging apparatus includes: a recording head that includes M numbers of the discharging units; a drive unit that drives the discharging unit; a residual vibration detecting unit that detects residual vibration occurring in the discharging unit; and a determining unit that determines a state of discharge of the liquid in the discharging unit on the basis of a detection result. The determining unit is capable of performing the determination in two or more determination modes, and determines at least one of one or a plurality of target discharging units that is to be a target of the determination during a determination time period, and a drive discharging unit that the drive unit is to drive so as to determine the state of discharge of the liquid in the target discharging unit from the M numbers of discharging units depending on the determination mode.

Abstract: An ink jet printer includes an ejection unit including a nozzle which ejects a liquid containing a pigment; a cavity which communicates with the nozzle; and a piezoelectric element which is provided in the cavity, and a driving signal generation unit which generates a driving signal allowing the piezoelectric element to be displaced such that the cavity expands or is contracted. The ink jet printer includes a detection unit that detects a cycle of a residual vibration waveform of the piezoelectric element which is generated by the driving signal being applied to the piezoelectric element and indicates a value according to change of the pressure inside of the cavity and a determination unit that determines the pigment is settled based on the cycle of the residual vibration waveform detected by the detection unit.