Patent ID: 9548182
Date: 2017-01-17
CPC Classifications: H01J

Claim:
1. An instrument producing a charged particle beam, the instrument comprising: a charged particle source; a plurality of first electrodes disposed along a direction of irradiation of charged particles from the charged particle source between an anode having a ground potential and a first cathode; a plurality of insulation members disposed between the plurality of first electrodes; and a housing which covers the plurality of first electrodes and the charged particle source, wherein the first cathode, the anode, and the plurality of first electrodes are mutually connected via first resistors, wherein the housing is formed from an insulating solid material and has an inner surface which is disposed to surround the charged particle source, the first cathode, the anode, and the plurality of first electrodes, wherein the housing includes a plurality of second electrodes mounted to the inner surface of the housing at positions in proximity to the plurality of first electrodes, and includes a second cathode mounted on the inner surface of the housing at a position opposite to the first cathode in a direction orthogonal to the direction of irradiation of the charged particles, and the second cathode is connected to have the same potential as the potential of the first cathode, and wherein at least one of the plurality of second electrodes is electrically connected to at least one of the plurality of first electrodes, each of the plurality of second electrodes having the same potential as the potential of the proximate one of the plurality of first electrodes.