Patent ID: 8272706
Filing Date: 2012-09-25
Classification: B41J

Abstract:
1. A liquid ejecting apparatus comprising: a liquid ejecting head including a nozzle, a pressurizing chamber that communicates with the nozzle, and a pressurizing element that causes a pressure change in liquid within the pressurizing chamber, the liquid ejecting head being capable of ejecting liquid from the nozzle by operating the pressurizing element; and a driving signal generation unit that generates a driving signal including a driving pulse that drives the pressurizing element, wherein the driving signal includes an ejection driving pulse that ejects a liquid droplet and a non-ejection driving pulse that drives the pressurizing element to a degree whereby a liquid droplet is not ejected; the ejection driving pulse is a pulse waveform having an expansion element that causes the pressurizing chamber to expand and retract a meniscus toward the pressurizing chamber and a constriction element that causes the pressurizing chamber expanded by the expansion element to constrict and push the meniscus in a direction of ejection; the non-ejection driving pulse is a pulse waveform having an expansion element that causes the pressurizing chamber to expand and retract the meniscus toward the pressurizing chamber, a holding element that holds a voltage at an end of the expansion element for a set amount of time, and a constriction element that causes the pressurizing chamber expanded by the expansion element to constrict and push the meniscus in the direction of ejection; and when a length of time from an end of the constriction element in the ejection driving pulse to a beginning of the expansion element in the non-ejection driving pulse is taken as t, the lengths of time of the expansion element, holding element, and constriction element in the non-ejection driving pulse are taken as a, b, and c, respectively, and an inherent vibration cycle of the liquid within the pressurizing chamber is taken as Tc, t, a, b, and c are within ranges defined by the following equations (1) through (3):