| 摘要 |
An ink jet printer is provided with an ink jet head and a controller. The ink jet head comprises a nozzle, an ink chamber communicating with the nozzle, a pressure chamber located between the nozzle and the ink chamber, and an actuator that changes volume of the pressure chamber. The controller controls the actuator to perform a first performance. The first performance includes a first change in which the volume of the pressure chamber increases and a second change in which the volume of the pressure chamber decreases. A period from the first change to the second change is 2/3xAL or below, or within a range between (2s-1/2)xAL and (2s+2/3)xAL, s is a positive integer. Discharging speed of ink discharged from the nozzle is substantially maximum if the period from the first change to the second change is set to AL.
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