Patent ID: 8998938
Filing Date: 2015-04-07
Classification: A61B

Abstract:
1. A fluid ejection device comprising: a fluid chamber whose capacity is variable; an inlet flow path and an outlet flow path communicating with the fluid chamber; a capacity changing unit which changes the capacity of the fluid chamber, the capacity changing unit including a piezoelectric element; a fluid supplying unit which supplies fluid to the inlet flow path; a nozzle including a fluid ejection opening disposed at an end of the outlet flow path opposite to an end communicating with the fluid chamber; a vibrating unit which vibrates a component in the vicinity of the fluid ejection opening; a vibration detecting unit including a sensor which detects the level of vibration of the nozzle in the vicinity of the fluid ejection opening; and an operation control unit which supplies drive signals that control operation of the capacity changing unit based on the level of the vibration detected by the vibration detecting unit, the drive signals causing the piezoelectric element to expand or contract to change the capacity of the fluid chamber.