Liquid discharge apparatus and head drive control device
A liquid discharge apparatus includes a liquid discharge head and circuitry. The liquid discharge head includes a nozzle to discharge liquid. The circuitry is configured to: generate and output a common drive waveform including a drive pulse for discharging liquid from the nozzle of the liquid discharge head; select a waveform portion of the drive pulse to be applied to a pressure generating element of the liquid discharge head; and output a selection signal for designating the waveform portion selected. The drive pulse includes at least an expansion waveform element for expanding a pressure chamber of the liquid discharge head and a holding waveform element for holding a state expanded by the expansion waveform element. The selection signal includes a deselection signal for deselecting at least a part of a waveform portion preceding the expansion waveform element having, as a terminal, a state held by the holding waveform element.
1. A liquid discharge apparatus, comprising:
a liquid discharge head including a nozzle to discharge liquid;
circuitry configured to:
generate and output a common drive waveform including a drive pulse for discharging liquid from the nozzle of the liquid discharge head;
select a waveform portion of the drive pulse to be applied to a pressure generating element of the liquid discharge head; and
output a selection signal for designating the waveform portion selected,
wherein the drive pulse includes at least an expansion waveform element for expanding a pressure chamber of the liquid discharge head and a holding waveform element for holding a state expanded by the expansion waveform element,
wherein the selection signal includes a deselection signal for deselecting at least a part of a waveform portion preceding the expansion waveform element having, as a terminal, a state held by the holding waveform element,
wherein the drive pulse includes a first-stage expansion waveform element for expanding the pressure chamber, a first-stage holding waveform element for holding a state expanded by the first-stage expansion waveform element, and a second-stage expansion waveform element for expanding the pressure chamber from a state held by the first-stage holding waveform element,
wherein the second-stage expansion waveform element is a waveform element having, as a terminal, the state held by the holding waveform element, and
wherein the deselection signal is a signal for deselecting a waveform portion that includes at least from a start of the first-stage holding waveform element of the drive pulse to a middle of the first-stage holding waveform element of the drive pulse in the common drive waveform.
2. The liquid discharge apparatus according to claim 1 ,
wherein the selection signal includes the circuitry is configured to output a plurality of selection signals for deselecting a waveform portion that is a part of the driving pulse, and the waveform portion deselected is different between the plurality of selection signals.
3. The liquid discharge apparatus according to claim 1 ,
wherein the selection signal is different depending on a drive frequency.
4. The liquid discharge apparatus according to claim 1 ,
wherein the selection signal is different depending on a discharge mode.
5. The liquid discharge apparatus of claim 1 , wherein the deselected waveform portion maintains a state different from the state of the holding waveform element.
6. A head drive control device, comprising:
circuitry configured to:
generate and output a common drive waveform including a drive pulse for discharging liquid from a nozzle of a liquid discharge head;
select a waveform portion of the drive pulse to be applied to a pressure generating element of the liquid discharge head; and
output a selection signal for designating the waveform portion selected,
wherein the drive pulse includes at least an expansion waveform element for expanding a pressure chamber of the liquid discharge head and a holding waveform element for holding a state expanded by the expansion waveform element,
wherein the selection signal includes a deselection signal for deselecting at least a part of a waveform portion preceding the expansion waveform element having, as a terminal, a state held by the holding waveform element,
wherein the drive pulse includes a first-stage expansion waveform element for expanding the pressure chamber, a first-stage holding waveform element for holding a state expanded by the first-stage expansion waveform element, and a second-stage expansion waveform element for expanding the pressure chamber from a state held by the first-stage holding waveform element,
wherein the second-stage expansion waveform element is a waveform element having, as a terminal, the state held by the holding waveform element, and
wherein the deselection signal is a signal for deselecting a waveform portion that includes at least from a start of the first-stage holding waveform element of the drive pulse to a middle of the first-stage holding waveform element of the drive pulse in the common drive waveform.
7. The head drive control device of claim 6 , wherein the deselected waveform portion maintains a state different from the state of the holding waveform element.