An inkjet printer comprising: a plurality of nozzles; a plurality of pressure chambers in fluid communication with respective ones of the plurality of nozzles individually; a plurality of diaphragms attached to respective ones of the plurality of pressure chambers individually, each of the plurality of diaphragms being deflected between a first state in which corresponding pressure chamber has a first volume and a second state in which the corresponding pressure chamber has a second volume larger than the first volume; a plurality of piezoelectric elements attached to respective ones of the plurality of diaphragms individually, each of the plurality of piezoelectric elements being configured to deflect corresponding diaphragm in response to a voltage applied to the each of the plurality of piezoelectric elements; and a controller configured to control voltage application to each of the plurality of piezoelectric elements, when a diaphragm is in the first state the controller applying a first, non-zero, voltage as a standby voltage so that the diaphragm is substantially flat and the respective pressure chamber is in a standby state, and when the diaphragm is in the second state the controller applying a second voltage lower than the first voltage, the controller being configured to apply the first voltage such that a pressure chamber is in the first state, to temporarily apply the second voltage such that the respective pressure chamber enters the second state, and to control the voltage from the second voltage to the first voltage such that a the respective pressure chamber ejects an ink droplet from the corresponding nozzle in response to the deflection of the respective diaphragm reverting from the second state to the first state. a plurality of nozzles; a plurality of pressure chambers in fluid communication with respective ones of the plurality of nozzles individually; a plurality of diaphragms attached to respective ones of the plurality of pressure chambers individually, each of the plurality of diaphragms being deflected between a first state in which corresponding pressure chamber has a first volume and a second state in which the corresponding pressure chamber has a second volume larger than the first volume; a plurality of piezoelectric elements attached to respective ones of the plurality of diaphragms individually, each of the plurality of piezoelectric elements being configured to deflect corresponding diaphragm in response to a voltage applied to the each of the plurality of piezoelectric elements; and a controller configured to control voltage application to each of the plurality of piezoelectric elements, when a diaphragm is in the first state the controller applying a first, non-zero, voltage as a standby voltage so that the diaphragm is substantially flat and the respective pressure chamber is in a standby state, and when the diaphragm is in the second state the controller applying a second voltage lower than the first voltage, the controller being configured to apply the first voltage such that a pressure chamber is in the first state, to temporarily apply the second voltage such that the respective pressure chamber enters the second state, and to control the voltage from the second voltage to the first voltage such that a the respective pressure chamber ejects an ink droplet from the corresponding nozzle in response to the deflection of the respective diaphragm reverting from the second state to the first state.