Patent ID: 9240305
Filing Date: 2016-01-19
CPC Classification: H01J

Claim Text:
1. A charged particle beam device, comprising a charged particle optic column configured to apply a primary charged particle beam on a sample, and a vacuum pump, comprising: an enclosure that makes up a part of the charged particle beam device, interior of the enclosure being evacuated with the vacuum pump; a diaphragm configured to separate a space to place the sample therein so that pressure of the space to place the sample therein is kept larger than pressure of the interior of the enclosure, the diaphragm letting the primary charged particle beam transmit or pass therethrough and being removable; a contact prevention member configured to prevent a contact between the sample and the diaphragm; and an adjustment mechanism configured to let a position of the contact prevention member that comes into contact with a sample base to hold the sample or a member to hold the diaphragm movable in a direction of an optical axis of the charged particle optic column.