| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid injection apparatus which enables an operator to easily recognize that an air bubble is mixed into a liquid chamber in the liquid injection apparatus.SOLUTION: Liquid in a liquid chamber is pressurized by applying drive voltage to a liquid chamber volume reducing part in a state where the liquid is supplied to the liquid chamber, and then the liquid is injected from an injection nozzle. To drive sound generated when the drive voltage is applied, sound data of pseudo drive sound having at least a part of frequency components among audio frequency components included in the drive sound, is stored, and whenever the drive voltage is applied, the pseudo drive sound is outputted by using the sound data of the pseudo drive sound so that sound pressure in a range of an audio frequency of the drive sound is reduced. Thus, when an air bubble is mixed into the liquid chamber, and the drive sound is changed, the drive sound cannot be canceled by the pseudo drive sound, which lets an operator feel that noise becomes bigger, and also lets the operator easily recognize mixture of the air bubble. |
