Patent ID: 9340012
Filing Date: 2016-05-17
CPC Classification: B41J

Claim Text:
1. An image forming apparatus comprising: a liquid ejecting head including a nozzle that ejects a droplet and a pressure producing unit that produces pressure to pressurize a pressure chamber communicating with the nozzle; and a head drive controlling unit that provides a driving signal to the pressure producing unit of the liquid ejecting head to drive the liquid ejecting head, wherein the head drive controlling unit outputs the driving signal including at least a first driving pulse and a second driving pulse to eject droplets and a residual vibration suppressing pulse to suppress residual vibration in the pressure chamber without ejecting a droplet, and the residual vibration suppressing pulse is output at such a timing that the residual vibration suppressing pulse has an opposite phase to a composite vibration Vab that is formed by superposition of a meniscus vibration Va generated by droplet ejection with the first driving pulse and a meniscus vibration Vb generated by droplet ejection with the second driving pulse, and wherein when a phase of the meniscus vibration Vb is behind a phase of the meniscus vibration Va by α