LIQUID DISCHARGE APPARATUS, CONTROL METHOD OF LIQUID DISCHARGE APPARATUS, AND CONTROL PROGRAM OF LIQUID DISCHARGE APPARATUS
First Claim
1. A liquid discharge apparatus comprising:
- 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 of the liquid in the discharge unit, depending on a detection result of the detection unit,the detection unit outputtinga first detection signal indicating a detection result of residual vibration in the discharge unit from a first timing, the first timing being a timing after a potential of the drive signal supplied to the piezoelectric element reaches a first potential from a potential different from the first potential and while the potential of the drive signal keeps the first potential after reaching the first potential, anda second detection signal indicating a detection result of residual vibration in the discharge unit from a second timing, the second timing being a timing after the potential of the drive signal supplied to the piezoelectric element reaches a second potential from a potential different from the second potential and while the potential of the drive signal keeps the second potential after reaching the second potential, andthe determination unit determining the discharge state of the liquid in the discharge unit, based on the first detection signal and the second detection signal.
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Accused Products
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.
7 Citations
9 Claims
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1. A liquid discharge apparatus comprising:
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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 of the liquid in the discharge unit, depending on a detection result of the detection unit, the detection unit outputting a first detection signal indicating a detection result of residual vibration in the discharge unit from a first timing, the first timing being a timing after a potential of the drive signal supplied to the piezoelectric element reaches a first potential from a potential different from the first potential and while the potential of the drive signal keeps the first potential after reaching the first potential, and a second detection signal indicating a detection result of residual vibration in the discharge unit from a second timing, the second timing being a timing after the potential of the drive signal supplied to the piezoelectric element reaches a second potential from a potential different from the second potential and while the potential of the drive signal keeps the second potential after reaching the second potential, and the determination unit determining the discharge state of the liquid in the discharge unit, based on the first detection signal and the second detection signal. - View Dependent Claims (5, 6, 9)
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2. A liquid discharge apparatus comprising:
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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 outputs a first detection signal indicating a detection result of residual vibration occurring in the discharge unit in a first period, and a second detection signal indicating a detection result of residual vibration occurring in the discharge unit in a second period, when a drive signal is supplied to the piezoelectric element, the drive signal having a drive waveform which is a first potential in the first period and is a second potential in the second period, the first potential during the first period being constant, the second potential during the second period being constant; and a determination unit that determines a discharge state of liquid in the discharge unit, based on the first detection signal and the second detection signal. - View Dependent Claims (3, 4)
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7. A control method of a liquid discharge apparatus, the liquid discharge apparatus including 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, the control method comprising:
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detecting residual vibration in the discharge unit from a first timing, the first timing being a timing after a potential of the drive signal supplied to the piezoelectric element reaches a first potential from a potential different from the first potential and while the potential of the drive signal keeps the first potential after reaching the first potential; outputting a first detection signal representing the detection result; detecting residual vibration in the discharge unit from a second timing, the second timing being a timing after the potential of the drive signal supplied to the piezoelectric element reaches a second potential from a potential different from the second potential and while the potential of the drive signal keeps the second potential after reaching the second potential; outputting a second detection signal representing the detection result; and determining a discharge state of liquid in the discharge unit, based on the first detection signal and the second detection signal.
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8. A non-transitory computer-readable medium storing control program of a liquid discharge apparatus, the liquid discharge apparatus including
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 computer, the control program causing the computer to function as a determination unit that determines a discharge state of liquid in the discharge unit, based on a first detection signal and a second detection signal, the first detection signal being output as a detection result of residual vibration in the discharge unit from a first timing, the first timing being a timing after a potential of the drive signal supplied to the piezoelectric element reaches a first potential from a potential different from the first potential and while the potential of the drive signal keeps the first potential after reaching the first potential, by the detection unit and the second detection signal being output as a detection result of residual vibration in the discharge unit from a second timing, the second timing being a timing after the potential of the drive signal supplied to the piezoelectric element reaches a second potential from a potential different from the second potential and while the potential of the drive signal keeps the second potential after reaching the second potential, by the detection unit.
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Specification