Patent ID: 9373480
Filing Date: 2016-06-21
CPC Classification: H01J

Claim Text:
1. A charged particle beam device comprising: a charged particle optical barrel for directing a primary charged particle beam to a sample; a casing which is adapted to form a portion of the charged particle beam device and to be interiorly evacuated by a vacuum pump, the sample being mounted outside the casing; a diaphragm which is capable of maintaining a space to be subjected to the evacuation at an airtight state and also is adapted to transmit or pass the primary charged particle beam therethrough; and a filter member which is placed on a path of the primary charged particle beam at least in a state where the primary charged particle beam is directed to the sample, is installed on a diaphragm holding member, adapted to hold the diaphragm, so as to be attached to both the filter member and the diaphragm, and, further, is adapted to transmit or pass, therethrough, the primary charged particle beam and a secondary charged particle derived from the sample, while intercepting at least a portion of a scattering substance which is scattered in the event of a fracture of the diaphragm; wherein the diaphragm holding member has a position-setting portion for setting a position of the filter member with respect to the diaphragm.