Patent ID: 8835883

Claim:
A charged particle radiation device, comprising: a sample chamber, in which a sample stage adapted to mount a sample is installed; a charged particle radiation irradiation section adapted to irradiate the sample with a charged particle radiation to observe and fabricate the sample; sidewalls installed on a periphery of the sample chamber and the charged particle radiation irradiation section; a ceiling board installed on a plane located in an upper part of the sidewalls; and a sound absorbing structure section disposed below the ceiling board, and including a plurality of hole sections and a hollow section in communication with the hole sections; wherein the sound absorbing structure section has an absorption band including a frequency band of a standing wave generated in a space surrounded by the sidewalls and the ceiling board; wherein the hollow section is formed of a plurality of cells partitioned on a lower surface of the ceiling board with partition walls; and wherein the plurality of hole sections is provided to a perforated board disposed on a lower surface of the plurality of cells.