Patent ID: 8882219

Claim:
An inkjet recording apparatus, comprising: an inkjet head which has a nozzle and an ejection energy generating element configured to cause droplets to be ejected from an ejection port of the nozzle; a head movement device which is configured to reciprocally move the inkjet head to scan a recording medium onto which the droplets ejected from the inkjet head are deposited; a linear encoder which is configured to output signals to determine a position of the inkjet head moved by the head movement device; an ejection trigger signal generating device which is configured to generate ejection trigger signals in accordance with the output signals of the linear encoder, the ejection trigger signals specifying ejection timings of the inkjet head with a temporal resolution of 0.1 μs order; and an ejection control device which is configured to cause the inkjet head to eject the droplets in accordance with the ejection timings specified by the ejection trigger signals, wherein the ejection trigger signal generating device includes: an interval calculating unit which is configured to calculate intervals of timing signals generated in accordance with edge timings of the output signals of the linear encoder; and a low-pass filter processing unit which is configured to carry out digital low-pass filter processing of a sequential calculation type, on values indicating the intervals of the timing signals calculated by the interval calculating unit.