Aerosol generating device

An aerosol generating apparatus comprising:

• a liquid storage configured to accommodate an aerosol generating material;
• a vibrator configured to generate ultrasonic vibration to atomize the aerosol generating material into an aerosol;
• and
• a processor configured to apply a voltage of a first magnitude to the vibrator in a smoke mode in which visible smoke is produced from the aerosol generating device and apply a voltage of a second magnitude smaller than the first magnitude to the vibrator in a smokeless mode in which no visible smoke is produced, thereby controlling a temperature of the vibrator to a temperature corresponding to the second magnitude, which is lower than a temperature corresponding to the first magnitude.

An aerosol generating device comprising:

• a liquid storage configured to accommodate an aerosol generating material;
• a vibrator configured to generate ultrasonic vibration to atomize the aerosol generating material into an aerosol;
• and
• a processor configured to:
• control a vibration frequency of the vibrator to a first vibration frequency in a smoke mode in which visible smoke is produced from the aerosol generating device, and
• control the vibration frequency of the vibrator to a second vibration frequency lower than the first vibration frequency by applying a voltage of a sub resonant frequency, which is lower than a main resonant frequency that causes a largest resonance from among a plurality of resonant frequencies of the vibrator.