Patent ID: 8357892
Filing Date: 2013-01-22
Classification: H01J

Abstract:
1. A mass spectrometer that, based on time required for ions emitted from a sample to fly within a flight tube being a vacuum vessel in an apparatus body, analyzes a mass of the ions, comprising: a microchannel plate arranged in the vacuum vessel at an ion reaching side of the flight tube, for outputting electrons in response to reached ions, the microchannel plate being directly fixed with the apparatus body by an input-side electrode electrically and physically connected to its ion reaching surface side; a flange portion attachably and detachably connected and fixed to an ion reaching-side end portion of the flight tube to form the vacuum vessel, and having a signal output terminal and a potential supply terminal exposed on an outer surface of the vacuum vessel; an anode portion fixed onto the flange portion to face the microchannel plate, being input with electrons output from the microchannel plate, and electrically connected to the signal output terminal; and an output-side electrode urging means fixed to the flange portion to urge an output side surface of the microchannel plate for electrically connecting the output side electrode of the microchannel plate and the potential supply terminal to each other.