Patent ID: 9633826
Date: 2017-04-25
CPC Classifications: H01J

Claim:
1. A mass spectrometer comprises: an ionization chamber that has a part for ionizing a sample, a mass spectrometer unit to which ions are introduced from the ionization chamber, and a control chamber that controls part of the ionization chamber, where the control chamber has a control chamber case, a power supply and/or a gas source configured in the control chamber case, and connecting tubes with which the power supply and/or the gas source are connected, whereas the connecting tubes are connected with part of the ionization chamber through an aperture in a predetermined region; the ionization chamber is movable between a maintenance position for performing maintenance of the mass spectrometer unit and the analysis position for conducting analysis of the sample, and there is a shielding plate linked with the motion of the ionization chamber, which closes part of the aperture of the predetermined region when the ionization chamber is in the analysis position, and opens part of the aperture of the predetermined region when the ionization chamber is in the maintenance position, so that the connecting tubes may open to the part of the aperture of the predetermined region.