Patent ID: 11866822
Assignee: KOKUSAI ELECTRIC CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A vaporizer comprising:
a precursor vessel in which a liquid precursor is stored;
a first heater immersed in the liquid precursor stored in the precursor vessel and configured to heat the liquid precursor;
a second heater configured to heat the precursor vessel;
a first temperature sensor immersed in the liquid precursor stored in the precursor vessel and configured to measure a temperature of the liquid precursor;
a second temperature sensor immersed in the liquid precursor stored in the precursor vessel and configured to measure a temperature of the liquid precursor;
a liquid surface detection sensor configured to detect a height of a liquid surface of the liquid precursor in the precursor vessel; and
a controller configured to be capable of:
controlling the first heater based on the temperature measured by the first temperature sensor;
controlling the second heater based on the temperature measured by the second temperature sensor; and
stopping heating by the first heater and the second heater, when a position of the liquid surface detected by the liquid surface detection sensor is lower than a predetermined liquid surface range set above the first temperature sensor.