Patent ID: 11894213
Assignee: HITACHI HIGH-TECH CORPORATION
Field: Measurement (Instruments)
Classification: CPC H  G | IPC H

Claim 12:
13. An ion milling device comprising:
a vacuum chamber configured to hold a specimen in a vacuum atmosphere;
an ion gun configured to irradiate the specimen with a non-focused ion beam;
a vaporization container configured to store a mixed solution of a water-soluble ionic liquid and water;
a nozzle configured to supply water vapor obtained by vaporizing the mixed solution to a vicinity of a surface of the specimen processed by the ion beam;
a first dew point meter configured to measure humidity in the vaporization container;
a second dew point meter configured to measure humidity in the vicinity of the surface of the specimen processed by the ion beam; and
a humidity control unit configured to control an amount of the water vapor supplied from the nozzle based on a measured value of the first dew point meter and a measured value of the second dew point meter.