Liquid discharge method, non-transitory computer-readable storage medium storing drive pulse determination program, and liquid discharge apparatus

1. A liquid discharge method of using a liquid discharge head including a drive element and a nozzle to discharge a liquid from the nozzle by applying a drive pulse to the drive element, the method comprising:

an acquisition step of acquiring a recording condition, the recording condition comprising a discharge characteristic and a discharge amount of the liquid from the liquid discharge head is acquired as the recording condition and

a driving step of applying the drive pulse to the drive element, wherein

the drive pulse includes a first potential, a second potential different from the first potential, and a third potential different from the first potential and the second potential, the first potential is a potential between the second potential and the third potential, the second potential being applied after the first potential, and the third potential being applied after the second potential, and

in the driving step,

the drive pulse is applied to the drive element such that a time of the second potential varies depending on the recording condition, a first potential change rate during a change from the first potential to the second potential does not vary depending on the recording condition, and a second potential change rate during a change from the second potential to the third potential does not vary depending on the recording condition,

one drive pulse determined among a plurality of the drive pulses is applied to the drive element, the drive pulses including at least a first drive pulse and a second drive pulse in which the time of the second potential is longer than the time in the first drive pulse,

the first drive pulse is applied to the drive element when the time of the second potential in the second drive pulse is a first time, and the discharge amount acquired in the acquisition step is a first discharge amount,

the second drive pulse is applied to the drive element when the time of the second potential in the second drive pulse is the first time, and the discharge amount acquired in the acquisition step is a second discharge amount smaller than the first discharge amount,

the second drive pulse is applied to the drive element when the time of the second potential in the first drive pulse is a second time which is longer than the first time, and the discharge amount acquired in the acquisition step is the first discharge amount, and

the first drive pulse is applied to the drive element when the time of the second potential in the first drive pulse is the second time, and the discharge amount acquired in the acquisition step is the second discharge amount.

2. The liquid discharge method according to claim 1 , wherein

the second potential is lower than the first potential, and

the third potential is higher than the first potential.

3. The liquid discharge method according to claim 1 , wherein

in the acquisition step, a discharge amount of the liquid from the nozzle is acquired as the recording condition, and

in the driving step,

the first drive pulse is applied to the drive element when the discharge amount acquired in the acquisition step is a first discharge amount, and

the second drive pulse is applied to the drive element when the discharge amount acquired in the acquisition step is a second discharge amount smaller than the first discharge amount.

4. The liquid discharge method according to claim 1 , wherein

in the acquisition step, a discharge amount of the liquid from the nozzle is acquired as the recording condition, and

in the driving step,

the first drive pulse is applied to the drive element when the discharge amount acquired in the acquisition step is a first discharge amount, and

the second drive pulse is applied to the drive element when the discharge amount acquired in the acquisition step is a second discharge amount greater than the first discharge amount.

5. The liquid discharge method according to claim 1 , wherein

in the acquisition step, a state of a dot formed on a recording medium by the liquid discharged from the liquid discharge head is acquired as the recording condition.

6. The liquid discharge method according to claim 1 , wherein

a time of the third potential in the second drive pulse is shorter than the time of the third potential in the first drive pulse.

7. The liquid discharge method according to claim 1 , wherein

the plurality of the drive pulses further include a third drive pulse in which the time of the second potential is longer than the time of the second potential in the second drive pulse.

8. The liquid discharge method according to claim 1 , further comprising:

a storing step of storing waveform information in a storage unit in a state where the waveform information is associated with identification information of the liquid discharge head, the waveform information indicating a waveform of the one drive pulse determined in the determination step.

9. The liquid discharge method according to claim 8 , wherein

in the storing step, a computer outside the storage unit transmits the waveform information associated with the identification information to cause the waveform information to be stored in the storage unit in the state where the waveform information is associated with the identification information.

10. A liquid discharge apparatus that includes a liquid discharge head including a drive element and a nozzle and discharges a liquid from the nozzle by applying a drive pulse to the drive element, the apparatus comprising:

an acquisition unit that acquires a recording condition, the recording condition comprising a discharge characteristic and a discharge amount of the liquid from the liquid discharge head, and

a driving unit that applies the drive pulse to the drive element, wherein

the drive pulse includes a first potential, a second potential different from the first potential, and a third potential different from the first potential and the second potential, the first potential is a potential between the second potential and the third potential, the second potential being applied after the first potential, and the third potential being applied after the second potential,

the driving unit applies the drive pulse to the drive element such that a time of the second potential varies depending on the recording condition, a first potential change rate during a change from the first potential to the second potential does not vary depending on the recording condition, and a second potential change rate during a change from the second potential to the third potential does not vary depending on the recording condition,

the drive pulse is one from among a plurality of drive pulses is applied to the drive element, the drive pulses including at least a first drive pulse and a second drive pulse in which the time of the second potential is longer than the time in the first drive pulse, the first drive pulse is applied to the drive element when the discharge amount acquired in by the acquisition unit is a first discharge amount, and the second drive pulse is applied to the drive element when the discharge amount is acquired by the acquisition unit is a second discharge amount smaller than the first discharge amount.