US 12,172,435 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. 8, 2022, as Appl. No. 17/653,903.
Claims priority of application No. 2021-038676 (JP), filed on Mar. 10, 2021.
Prior Publication US 2022/0305779 A1, Sep. 29, 2022
Int. Cl. B41J 2/045 (2006.01)
CPC B41J 2/04588 (2013.01) [B41J 2/04541 (2013.01); B41J 2/04581 (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 drive signals that include a first drive signal and a second 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:
acquiring physical property information indicating a physical property of liquid in the liquid discharging head;
determining a waveform of the drive signal based on the physical property information;
supplying the drive signal to the drive element, the drive signal comprising:
a first waveform, which is included in the first drive signal among the drive signals having the waveforms determined based on the physical property information, 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, which is included in the second drive signal among the drive signals having the waveforms determined based on the physical property information, the second waveform being configured to grow the first liquid column to a second liquid column when the second waveform 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, a droplet is formed from the second liquid column to be discharged from the discharging portion,
wherein the second drive signal has the second waveform determined in advance regardless of the physical property information.