Patent ID: 9340013
Filing Date: 2016-05-17
CPC Classification: B41J

Claim Text:
1. An image forming apparatus, comprising: a liquid discharge head including: plural nozzles to discharge droplets; a plurality of individual liquid chambers provided for respective ones of the plural nozzles, each liquid chamber being communicated with a corresponding nozzle amongst the plural nozzles; a pressure generator to generate a pressure pressurizing a liquid in each one of the individual liquid chambers, and a head drive controller to chronologically in one drive cycle, generate a common drive waveform including plural discharge pulses for causing droplet discharge, select one or more discharge pulses out of the plural discharge pulses, and apply the selected discharge pulses to the pressure generator to discharge at least two droplets having different sizes, wherein a meniscus oscillation generated in a drive individual liquid chamber applied with the pressure by the pressure generator has a phase reverse to a phase of a meniscus oscillation generated in an adjacent non-drive individual liquid chamber not applied with the pressure by the pressure generator, the common drive waveform generated by the head drive controller includes a common discharge pulse used for forming droplets having at least two sizes and an noncommon discharge pulse used for forming one of the droplets having two sizes, and a pulse interval between the common discharge pulse and the noncommon discharge pulse located right before the common discharge pulse is a time area having a phase reverse to resonance.