Liquid droplet forming device and liquid droplet forming method

A liquid droplet forming method using a liquid droplet forming device that comprises:

• a liquid container capable of containing a liquid;
• a membranous member that is disposed at a bottom of the liquid container and comprises a discharging hole;
• a deforming unit capable of deforming the membranous member;
• and
• a driving unit configured to drive the deforming unit by outputting a discharging signal for deforming the membranous member to discharge the liquid or a suppressing signal for suppressing residual vibration of the membranous member,
• the liquid droplet forming method comprising:
• containing the liquid in the liquid container;
• and
• driving the deforming unit by outputting the discharging signal for deforming the membranous member to discharge the liquid or the suppressing signal for suppressing residual vibration of the membranous member,
• wherein the suppressing signal is a signal based on a natural vibration period T0 of the membranous member,
• wherein an amplitude of the suppressing signal is lower than or equal to an amplitude of the discharging signal, and
• wherein an interval time Ti from when outputting of the discharging signal is ended until when outputting of the suppressing signal is started satisfies a formula:
• Ti=(m−½)×T0, where m represents a positive integer.