Liquid ejecting apparatus
AssigneeSeiko Epson Corporation
InventorShunya Fukuda
Life of this patent
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Abstract
A drive signal includes a first drive pulse that causes liquid droplets to be ejected from nozzles and a second drive pulse that causes liquid droplets of a different size to those of the first drive pulse to be ejected from the nozzles. Each pulse includes at least an expansion element that causes a pressure chamber to expand by changing from a standard potential, which is a standard for changes in potential, to an expansion potential, a contraction element that causes the expanded pressure chamber to contract by changing from a potential that is on an expansion potential side of the standard potential to a contraction potential that exceeds the standard potential thereby ejecting the liquid. Initiation potentials of the contraction elements of the first and second drive pulses are made to be uniform at the same potential.
Claims5
A liquid ejecting apparatus comprising:
- a liquid ejecting head having a piezoelectric body that deforms due to a drive signal being applied thereto and a pressure chamber containing a liquid, deformation of the piezoelectric body creating a pressure fluctuation in the liquid inside the pressure chamber to eject liquid droplets from the nozzles;
- and
- a drive signal generator that generates the drive signal,
- wherein the drive signal consists of at least one first drive pulse that causes liquid droplets to be ejected from the nozzles and at least one second drive pulse that causes liquid droplets of a different size to those of the first drive pulse to be ejected from the nozzles, wherein the first and second drive pulses comprise an ejection pulse,
- wherein the first drive pulse and the second drive pulse each have at least (i) an expansion element that causes the pressure chamber to expand by changing from a standard potential, which is a standard for changes in potential, to an expansion potential, the expansion element extending from the standard potential to a lowest potential, and (ii) a contraction element that causes the expanded pressure chamber to contract by changing from the lowest potential that is on an expansion potential side of the standard potential to a contraction potential that exceeds the standard potential thereby ejecting the liquid, and
- wherein an initiation potential of the contraction element of the first drive pulse and an initiation potential of the contraction element of the second drive pulse are set to the same potential at the lowest potential, and
- wherein an ending potential of the contraction element of the first drive pulse is different from an ending potential of the contraction element of the second drive pulse.
Dependencies are inferred from the claim text.