Liquid droplet forming device

A liquid droplet forming device comprising:

• an ejection head that ejects a liquid droplet of a liquid containing settling particles;
• and
• a control unit that controls a behavior of the ejection head by supplying an electrical signal, wherein
• the ejection head includes
• a liquid holding portion that holds the liquid,
• a film-like member that has an ejection hole for ejecting the liquid droplet and that forms a liquid chamber, which holds the liquid, together with the liquid holding portion,
• vibration applying means for vibrating the film-like member based on the electrical signal, and
• stirring means for stirring the liquid held in the liquid holding portion,
• the electrical signal includes
• an ejection signal for forming the liquid droplet by vibrating the film-like member,
• a micro-vibration signal for vibrating the film-like member in a range in which the liquid droplet is not formed, the micro-vibration signal having a drive voltage of a signal waveform lower than a drive voltage of the ejection signal, and
• a control signal for controlling a behavior of the stirring means,
• the control unit is configured to selectively supply any one of the ejection signal and the micro-vibration signal to the vibration applying means and applies the control signal to the stirring means, and
• the control unit is configured to continuously supply the micro-vibration signal during a standby time from the ejection of the liquid droplet to the next ejection of the liquid droplet.