Patent ID: 11919301
Assignee: SEIKO EPSON CORPORATION
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A liquid ejecting apparatus comprising:
an ejecting section including
a nozzle that ejects liquid to be landed on a medium,
a pressure chamber that communicates with the nozzle, and
a driving element supplied with a driving signal to generate a pressure variation in liquid in the pressure chamber; and

a driving-signal generation unit that generates the driving signal, wherein
the driving signal includes a plurality of ejection pulses for ejecting a plurality of droplets from the nozzle during one cycle,
the plurality of droplets due to the plurality of ejection pulses coalesces before landing on the medium,
the plurality of ejection pulses includes
a final ejection pulse that corresponds to a final droplet ejected last from the nozzle among the plurality of droplets and
a preceding ejection pulse that corresponds to a preceding droplet, among the plurality of droplets, ejected from the nozzle before the final droplet,

the preceding ejection pulse includes
a first expansion element that expands the pressure chamber,
a first expansion-maintaining element that maintains expansion of the pressure chamber by the first expansion element,
a first contraction element that contracts the pressure chamber expanded by the first expansion element, and
a first vibration-damping element that, after the first contraction element contracts the pressure chamber, expands the pressure chamber to reduce residual vibration of liquid in the pressure chamber,

the final ejection pulse includes
a second expansion element that expands the pressure chamber,
a second expansion-maintaining element that maintains expansion of the pressure chamber by the second expansion element,
a second contraction element that contracts the pressure chamber expanded by the second expansion element, and
a second vibration-damping element that, after the second contraction element contracts the pressure chamber, expands the pressure chamber to reduce residual vibration of liquid in the pressure chamber, and

a time width of a sum of the second expansion element and the second expansion-maintaining element of the final ejection pulse is longer than a length that is 0.5 multiplied by a natural-vibration cycle of the ejecting section, and is shorter than a length that is 1.0 multiplied by the natural-vibration cycle of the ejecting section.