US 12,128,683 B2
Drive method of liquid discharging head and liquid discharging apparatus
Takahiro Katakura, Okaya (JP); Takanori Aimono, Matsumoto (JP); and Shotaro Tamai, Matsumoto (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Mar. 7, 2022, as Appl. No. 17/653,759.
Claims priority of application No. 2021-038552 (JP), filed on Mar. 10, 2021.
Prior Publication US 2022/0288926 A1, Sep. 15, 2022
Int. Cl. B41J 2/045 (2006.01); B41J 2/165 (2006.01)
CPC B41J 2/04588 (2013.01) [B41J 2/0451 (2013.01); B41J 2/165 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A drive method of a liquid discharging head having a discharging portion that includes
a drive element that displaces by being supplied with a drive signal,
a pressure chamber inside which pressure is increased or decreased according to a displacement of the drive element, and
a nozzle configured to communicate with the pressure chamber to discharge liquid, which fills inside the pressure chamber, as a droplet in a discharging direction according to an increase or a decrease in the pressure inside the pressure chamber, the drive method comprising:
supplying a drive signal to the drive element, the drive signal comprising at least one of:
a first waveform including a first drive pulse having a first drive component that causes the pressure inside the pressure chamber to decrease and a second drive component that causes the pressure inside the pressure chamber to increase, the first waveform being configured to form a first liquid column in which a liquid surface inside the discharging portion protrudes in the discharging direction; and
a second waveform including a second drive pulse having a third drive component that causes the pressure inside the pressure chamber to decrease and a fourth drive component that causes the pressure inside the pressure chamber to increase, the second waveform being configured to grow the first liquid column to a second liquid column when the second wave form is supplied to the drive element in a time that the first liquid column is forming, the second liquid column comprising the liquid surface inside the discharging portion protruding in the discharging direction wherein
when the drive signal having the first waveform but not having the second waveform is supplied to the drive element, a droplet is not discharged from the discharging portion,
when the drive signal having the second waveform but not having the first waveform is supplied to the drive element, a droplet is not discharged from the discharging portion,
when the drive signal having the first waveform and the second waveform is supplied to the drive element, with the second waveform being supplied to the drive element in the time that the first liquid column is forming, a droplet is formed from the second liquid column to be discharged from the discharging portion, and
when a front end of the second liquid column moves in the discharging direction, the third drive component of the second drive pulse of the drive signal is supplied to the drive element.